JPH07330978A - Thermoplastic olefin elastomer composition for air bag cover material - Google Patents
Thermoplastic olefin elastomer composition for air bag cover materialInfo
- Publication number
- JPH07330978A JPH07330978A JP6155341A JP15534194A JPH07330978A JP H07330978 A JPH07330978 A JP H07330978A JP 6155341 A JP6155341 A JP 6155341A JP 15534194 A JP15534194 A JP 15534194A JP H07330978 A JPH07330978 A JP H07330978A
- Authority
- JP
- Japan
- Prior art keywords
- weight
- air bag
- component
- bag cover
- parts
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
- 239000000203 mixture Substances 0.000 title claims abstract description 64
- 229920001971 elastomer Polymers 0.000 title claims abstract description 33
- 239000000463 material Substances 0.000 title claims description 43
- 229920002397 thermoplastic olefin Polymers 0.000 title claims description 24
- 239000000806 elastomer Substances 0.000 title description 7
- 239000004743 Polypropylene Substances 0.000 claims abstract description 31
- 229920001155 polypropylene Polymers 0.000 claims abstract description 31
- -1 polypropylene Polymers 0.000 claims abstract description 27
- 239000005060 rubber Substances 0.000 claims abstract description 26
- 239000000314 lubricant Substances 0.000 claims abstract description 20
- 235000014113 dietary fatty acids Nutrition 0.000 claims abstract description 16
- 239000000194 fatty acid Substances 0.000 claims abstract description 16
- 229930195729 fatty acid Natural products 0.000 claims abstract description 16
- 150000004665 fatty acids Chemical class 0.000 claims abstract description 16
- 239000000155 melt Substances 0.000 claims abstract description 3
- 238000002156 mixing Methods 0.000 claims description 24
- 239000002480 mineral oil Substances 0.000 claims description 23
- 235000010446 mineral oil Nutrition 0.000 claims description 23
- 238000004898 kneading Methods 0.000 claims description 17
- 229920002725 thermoplastic elastomer Polymers 0.000 claims description 16
- 239000004902 Softening Agent Substances 0.000 claims description 15
- 229920001577 copolymer Polymers 0.000 claims description 14
- 150000001336 alkenes Chemical class 0.000 claims description 13
- JRZJOMJEPLMPRA-UHFFFAOYSA-N olefin Natural products CCCCCCCC=C JRZJOMJEPLMPRA-UHFFFAOYSA-N 0.000 claims description 13
- VGGSQFUCUMXWEO-UHFFFAOYSA-N Ethene Chemical compound C=C VGGSQFUCUMXWEO-UHFFFAOYSA-N 0.000 claims description 12
- 239000005977 Ethylene Substances 0.000 claims description 12
- 238000013329 compounding Methods 0.000 claims description 3
- 238000013016 damping Methods 0.000 abstract description 15
- 229920001038 ethylene copolymer Polymers 0.000 abstract description 9
- 239000011342 resin composition Substances 0.000 abstract description 5
- 229910052500 inorganic mineral Inorganic materials 0.000 abstract 1
- 239000011707 mineral Substances 0.000 abstract 1
- 230000000704 physical effect Effects 0.000 description 32
- PPBRXRYQALVLMV-UHFFFAOYSA-N Styrene Chemical compound C=CC1=CC=CC=C1 PPBRXRYQALVLMV-UHFFFAOYSA-N 0.000 description 16
- 238000000034 method Methods 0.000 description 15
- 239000003921 oil Substances 0.000 description 13
- 238000000465 moulding Methods 0.000 description 12
- 230000000052 comparative effect Effects 0.000 description 10
- 238000012937 correction Methods 0.000 description 9
- 238000005259 measurement Methods 0.000 description 8
- 239000012792 core layer Substances 0.000 description 6
- 239000006185 dispersion Substances 0.000 description 6
- 239000010410 layer Substances 0.000 description 6
- 238000003860 storage Methods 0.000 description 6
- 229920001935 styrene-ethylene-butadiene-styrene Polymers 0.000 description 6
- 238000004519 manufacturing process Methods 0.000 description 5
- 239000012779 reinforcing material Substances 0.000 description 5
- 229920005989 resin Polymers 0.000 description 5
- 239000011347 resin Substances 0.000 description 5
- 239000002344 surface layer Substances 0.000 description 5
- 150000001993 dienes Chemical class 0.000 description 4
- 239000012634 fragment Substances 0.000 description 4
- 239000000654 additive Substances 0.000 description 3
- 229920000098 polyolefin Polymers 0.000 description 3
- 238000012545 processing Methods 0.000 description 3
- 229920001169 thermoplastic Polymers 0.000 description 3
- 229920005992 thermoplastic resin Polymers 0.000 description 3
- 239000004416 thermosoftening plastic Substances 0.000 description 3
- VXNZUUAINFGPBY-UHFFFAOYSA-N 1-Butene Chemical compound CCC=C VXNZUUAINFGPBY-UHFFFAOYSA-N 0.000 description 2
- ZCYVEMRRCGMTRW-UHFFFAOYSA-N 7553-56-2 Chemical compound [I] ZCYVEMRRCGMTRW-UHFFFAOYSA-N 0.000 description 2
- VTYYLEPIZMXCLO-UHFFFAOYSA-L Calcium carbonate Chemical compound [Ca+2].[O-]C([O-])=O VTYYLEPIZMXCLO-UHFFFAOYSA-L 0.000 description 2
- 241000446313 Lamella Species 0.000 description 2
- 230000000740 bleeding effect Effects 0.000 description 2
- 239000006229 carbon black Substances 0.000 description 2
- 230000006378 damage Effects 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- UAUDZVJPLUQNMU-KTKRTIGZSA-N erucamide Chemical compound CCCCCCCC\C=C/CCCCCCCCCCCC(N)=O UAUDZVJPLUQNMU-KTKRTIGZSA-N 0.000 description 2
- 238000001746 injection moulding Methods 0.000 description 2
- 239000011630 iodine Substances 0.000 description 2
- 229910052740 iodine Inorganic materials 0.000 description 2
- 239000003208 petroleum Substances 0.000 description 2
- 229920005672 polyolefin resin Polymers 0.000 description 2
- QQONPFPTGQHPMA-UHFFFAOYSA-N propylene Natural products CC=C QQONPFPTGQHPMA-UHFFFAOYSA-N 0.000 description 2
- 125000004805 propylene group Chemical group [H]C([H])([H])C([H])([*:1])C([H])([H])[*:2] 0.000 description 2
- 238000010008 shearing Methods 0.000 description 2
- 229920003048 styrene butadiene rubber Polymers 0.000 description 2
- OJOWICOBYCXEKR-APPZFPTMSA-N (1S,4R)-5-ethylidenebicyclo[2.2.1]hept-2-ene Chemical compound CC=C1C[C@@H]2C[C@@H]1C=C2 OJOWICOBYCXEKR-APPZFPTMSA-N 0.000 description 1
- RRKODOZNUZCUBN-CCAGOZQPSA-N (1z,3z)-cycloocta-1,3-diene Chemical compound C1CC\C=C/C=C\C1 RRKODOZNUZCUBN-CCAGOZQPSA-N 0.000 description 1
- PRBHEGAFLDMLAL-GQCTYLIASA-N (4e)-hexa-1,4-diene Chemical compound C\C=C\CC=C PRBHEGAFLDMLAL-GQCTYLIASA-N 0.000 description 1
- HYBLFDUGSBOMPI-BQYQJAHWSA-N (4e)-octa-1,4-diene Chemical compound CCC\C=C\CC=C HYBLFDUGSBOMPI-BQYQJAHWSA-N 0.000 description 1
- OJOWICOBYCXEKR-KRXBUXKQSA-N (5e)-5-ethylidenebicyclo[2.2.1]hept-2-ene Chemical compound C1C2C(=C/C)/CC1C=C2 OJOWICOBYCXEKR-KRXBUXKQSA-N 0.000 description 1
- PRBHEGAFLDMLAL-UHFFFAOYSA-N 1,5-Hexadiene Natural products CC=CCC=C PRBHEGAFLDMLAL-UHFFFAOYSA-N 0.000 description 1
- LIKMAJRDDDTEIG-UHFFFAOYSA-N 1-hexene Chemical compound CCCCC=C LIKMAJRDDDTEIG-UHFFFAOYSA-N 0.000 description 1
- HECLRDQVFMWTQS-RGOKHQFPSA-N 1755-01-7 Chemical compound C1[C@H]2[C@@H]3CC=C[C@@H]3[C@@H]1C=C2 HECLRDQVFMWTQS-RGOKHQFPSA-N 0.000 description 1
- DSAYAFZWRDYBQY-UHFFFAOYSA-N 2,5-dimethylhexa-1,5-diene Chemical compound CC(=C)CCC(C)=C DSAYAFZWRDYBQY-UHFFFAOYSA-N 0.000 description 1
- NWPQAENAYWENSD-UHFFFAOYSA-N 5-butylidenebicyclo[2.2.1]hept-2-ene Chemical compound C1C2C(=CCCC)CC1C=C2 NWPQAENAYWENSD-UHFFFAOYSA-N 0.000 description 1
- 239000005995 Aluminium silicate Substances 0.000 description 1
- 206010016322 Feeling abnormal Diseases 0.000 description 1
- UFWIBTONFRDIAS-UHFFFAOYSA-N Naphthalene Chemical compound C1=CC=CC2=CC=CC=C21 UFWIBTONFRDIAS-UHFFFAOYSA-N 0.000 description 1
- 239000006057 Non-nutritive feed additive Substances 0.000 description 1
- 239000004698 Polyethylene Substances 0.000 description 1
- 229920005830 Polyurethane Foam Polymers 0.000 description 1
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 1
- 239000004433 Thermoplastic polyurethane Substances 0.000 description 1
- 208000027418 Wounds and injury Diseases 0.000 description 1
- 239000006096 absorbing agent Substances 0.000 description 1
- 230000000996 additive effect Effects 0.000 description 1
- 235000012211 aluminium silicate Nutrition 0.000 description 1
- 150000001408 amides Chemical class 0.000 description 1
- 239000003963 antioxidant agent Substances 0.000 description 1
- 239000002216 antistatic agent Substances 0.000 description 1
- 239000010692 aromatic oil Substances 0.000 description 1
- 125000003118 aryl group Chemical group 0.000 description 1
- 229920001400 block copolymer Polymers 0.000 description 1
- 238000009835 boiling Methods 0.000 description 1
- 229910000019 calcium carbonate Inorganic materials 0.000 description 1
- 125000004432 carbon atom Chemical group C* 0.000 description 1
- 238000003776 cleavage reaction Methods 0.000 description 1
- 238000004040 coloring Methods 0.000 description 1
- 238000004132 cross linking Methods 0.000 description 1
- 239000013078 crystal Substances 0.000 description 1
- UVJHQYIOXKWHFD-UHFFFAOYSA-N cyclohexa-1,4-diene Chemical compound C1C=CCC=C1 UVJHQYIOXKWHFD-UHFFFAOYSA-N 0.000 description 1
- HQQADJVZYDDRJT-UHFFFAOYSA-N ethene;prop-1-ene Chemical group C=C.CC=C HQQADJVZYDDRJT-UHFFFAOYSA-N 0.000 description 1
- 238000011156 evaluation Methods 0.000 description 1
- 239000000945 filler Substances 0.000 description 1
- 239000003063 flame retardant Substances 0.000 description 1
- 239000003365 glass fiber Substances 0.000 description 1
- 239000012760 heat stabilizer Substances 0.000 description 1
- PYGSKMBEVAICCR-UHFFFAOYSA-N hexa-1,5-diene Chemical compound C=CCCC=C PYGSKMBEVAICCR-UHFFFAOYSA-N 0.000 description 1
- 208000014674 injury Diseases 0.000 description 1
- NLYAJNPCOHFWQQ-UHFFFAOYSA-N kaolin Chemical compound O.O.O=[Al]O[Si](=O)O[Si](=O)O[Al]=O NLYAJNPCOHFWQQ-UHFFFAOYSA-N 0.000 description 1
- 239000004611 light stabiliser Substances 0.000 description 1
- 229940057995 liquid paraffin Drugs 0.000 description 1
- 230000014759 maintenance of location Effects 0.000 description 1
- 238000000691 measurement method Methods 0.000 description 1
- 238000002844 melting Methods 0.000 description 1
- 230000008018 melting Effects 0.000 description 1
- 239000010445 mica Substances 0.000 description 1
- 229910052618 mica group Inorganic materials 0.000 description 1
- 239000000178 monomer Substances 0.000 description 1
- FTQWRYSLUYAIRQ-UHFFFAOYSA-N n-[(octadecanoylamino)methyl]octadecanamide Chemical compound CCCCCCCCCCCCCCCCCC(=O)NCNC(=O)CCCCCCCCCCCCCCCCC FTQWRYSLUYAIRQ-UHFFFAOYSA-N 0.000 description 1
- JFNLZVQOOSMTJK-UHFFFAOYSA-N norbornene Chemical compound C1C2CCC1C=C2 JFNLZVQOOSMTJK-UHFFFAOYSA-N 0.000 description 1
- 239000002667 nucleating agent Substances 0.000 description 1
- LYRFLYHAGKPMFH-UHFFFAOYSA-N octadecanamide Chemical compound CCCCCCCCCCCCCCCCCC(N)=O LYRFLYHAGKPMFH-UHFFFAOYSA-N 0.000 description 1
- FATBGEAMYMYZAF-KTKRTIGZSA-N oleamide Chemical compound CCCCCCCC\C=C/CCCCCCCC(N)=O FATBGEAMYMYZAF-KTKRTIGZSA-N 0.000 description 1
- 229920006285 olefinic elastomer Polymers 0.000 description 1
- 239000010690 paraffinic oil Substances 0.000 description 1
- QYZLKGVUSQXAMU-UHFFFAOYSA-N penta-1,4-diene Chemical compound C=CCC=C QYZLKGVUSQXAMU-UHFFFAOYSA-N 0.000 description 1
- 230000002093 peripheral effect Effects 0.000 description 1
- 229920003023 plastic Polymers 0.000 description 1
- 239000004033 plastic Substances 0.000 description 1
- 229920002647 polyamide Polymers 0.000 description 1
- 229920000728 polyester Polymers 0.000 description 1
- 229920000573 polyethylene Polymers 0.000 description 1
- 229920000642 polymer Polymers 0.000 description 1
- 229920006124 polyolefin elastomer Polymers 0.000 description 1
- 229920002635 polyurethane Polymers 0.000 description 1
- 239000004814 polyurethane Substances 0.000 description 1
- 239000011496 polyurethane foam Substances 0.000 description 1
- 229920005604 random copolymer Polymers 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- 230000000452 restraining effect Effects 0.000 description 1
- 239000008036 rubber plasticizer Substances 0.000 description 1
- 230000007017 scission Effects 0.000 description 1
- 239000002356 single layer Substances 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 150000003440 styrenes Chemical class 0.000 description 1
- 239000012209 synthetic fiber Substances 0.000 description 1
- 229920002994 synthetic fiber Polymers 0.000 description 1
- 239000000454 talc Substances 0.000 description 1
- 229910052623 talc Inorganic materials 0.000 description 1
- 229920002803 thermoplastic polyurethane Polymers 0.000 description 1
- 239000002023 wood Substances 0.000 description 1
- 239000004711 α-olefin Substances 0.000 description 1
Landscapes
- Compositions Of Macromolecular Compounds (AREA)
- Air Bags (AREA)
Abstract
Description
【０００１】[0001]
【産業上の利用分野】本発明は、車両に安全装置として
搭載されるエアーバッグカバー材用オレフィン系熱可塑
性エラストマー組成物に関する。さらに詳しくいえば、
車両の衝突の際に瞬時に膨脹して運転手あるいは助手席
搭乗者を保護するエアーバッグを収納するためにステア
リングホイールやインストルパネル部分に装着され、作
動時には瞬間的に破壊されるが搭乗者を傷付ける破片を
生じず、車内装着に適した表面特性、制振性及び低温で
の破断伸度に優れたエアーバッグカバー材用オレフィン
系熱可塑性エラストマー組成物に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an olefinic thermoplastic elastomer composition for an air bag cover material mounted on a vehicle as a safety device. More specifically,
It is attached to the steering wheel and the instrument panel part to store the airbag that protects the driver or passenger in the passenger seat by inflating it in the event of a vehicle collision. The present invention relates to an olefin-based thermoplastic elastomer composition for an air bag cover material, which is free from damage pieces and has excellent surface properties suitable for mounting in a vehicle, vibration damping properties, and excellent elongation at break at low temperatures.
【０００２】[0002]
【従来の技術およびその課題】車両の衝突の際に運転手
あるいは助手席搭乗者を保護するエアーバッグシステム
は、衝突を感知する装置とエアーバッグ装置からなる。
後者のエアーバッグ装置はエアーバッグ、エアーバッグ
を膨脹させるガスを発生させる装置、およびそれらを収
納するカバーからなり、カバーは運転手前方のステアリ
ングホイールや助手席前方のインストルパネル部分に取
付けられる。2. Description of the Related Art An air bag system for protecting a driver or a passenger in a passenger seat in the event of a vehicle collision comprises a collision sensing device and an air bag device.
The latter air bag device is composed of an air bag, a device for generating gas for inflating the air bag, and a cover for housing them, and the cover is attached to a steering wheel in front of the driver or an instrument panel portion in front of the passenger seat.
【０００３】衝突事故で感知装置が作動すると、ガス発
生器から瞬間的にガスが発生し、エアーバッグ内を充満
したガスの圧力で、収納カバーに予め設けた薄肉部分等
が破壊されて、搭乗者の全面にエアーバッグが膨脹放出
して、搭乗者を座席側に拘束しステアリングホイール等
の操縦装置、フロントガラス、計器盤等への衝突による
負傷事故を防止あるいは軽減することができる。When a sensing device is activated in a collision accident, gas is generated instantaneously from the gas generator, and the thin wall portion or the like provided in advance on the storage cover is destroyed by the pressure of the gas filling the inside of the air bag, and the passenger boarding. The airbag can be inflated and released over the entire surface of the person, restraining the occupant to the seat side, and preventing or reducing an injury accident due to a collision with a steering wheel or other control device, windshield, instrument panel, or the like.
【０００４】エアーバッグカバー材に要求される特性と
しては、衝突時のエアーバッグ内のガス圧で瞬間的に確
実に破砕されること、破砕の際に搭乗者を傷付ける破片
を生じないこと、車内に装着するにふさわしい外観特性
を有すること、車体から伝達される振動を軽減する制振
性を備えていること等が挙げられる。The characteristics required for an air bag cover material are that it is instantaneously and reliably crushed by the gas pressure in the air bag at the time of a collision, that no fragments will injure the occupant during the crushing, It has an appearance characteristic suitable for being mounted on a vehicle, and has a damping property for reducing the vibration transmitted from the vehicle body.
【０００５】エアーバッグ収納カバーについては、従来
その構造あるいは材質が種々提案されているが、破砕時
の破片の飛散を防止する目的では、通常補強材が使用さ
れている。例えば、発泡ポリウレタン等の材料の破断想
定部分以外にネット等の補強材を埋め込んでカバー全体
を形成するものがあるが（特開昭50-127336 号、特開昭
55-110643 号等）、破断想定部分のみを除くカバー全体
に精度よく補強材を埋め込むための製造工程が複雑であ
り、生産効率が低く、コストが高くなるという問題があ
る。Various structures and materials have been proposed for the air bag storage cover, but a reinforcing material is usually used for the purpose of preventing scattering of fragments during crushing. For example, there is one in which a reinforcing material such as a net is embedded in a portion other than a portion of a material such as polyurethane foam which is supposed to be broken to form the entire cover (Japanese Patent Laid-Open Nos. 50-127336 and 50-327336).
No. 55-110643), the manufacturing process for accurately embedding the reinforcing material in the entire cover except for the fractured part is complicated, resulting in low production efficiency and high cost.
【０００６】そこで、エアーバッグ装置に必要な強度と
形状を保持し得るコア層（内層）と、柔らかくソフト感
を与え得る表層とからなる二層タイプの収納カバーが提
案されている。例えば、オレフィン系ゴムを含有するコ
ア層と熱可塑性樹脂の表層とからなるもの（特開平2-22
0946号）、オレフィン系樹脂のコア層とスチレン系ゴム
を主要成分とする表層とからなるもの（特開平3-189252
号）、オレフィン系エラストマーとその表層材料よりも
引っ張り強度の大きいエラストマーまたは樹脂のコア層
からなるもの（特開平4-15145 号）、ポリウレタン系熱
可塑性エラストマーのコア層とスチレン系またはオレフ
ィン系熱可塑性エラストマーの表層からなるもの（特開
平5-286399号）等がある。Therefore, a two-layer type storage cover has been proposed which comprises a core layer (inner layer) capable of maintaining the strength and shape required for an air bag device, and a surface layer capable of giving a soft and soft feeling. For example, one comprising a core layer containing an olefinic rubber and a surface layer of a thermoplastic resin (Japanese Patent Application Laid-Open No. 2-22
No. 0946), which comprises a core layer of an olefin resin and a surface layer containing styrene rubber as a main component (JP-A-3-189252).
No. 4), an olefin elastomer and a core layer of an elastomer or resin having a tensile strength higher than that of the surface material thereof (JP-A-4-15145), a core layer of a thermoplastic polyurethane elastomer and a styrene or olefin thermoplastic For example, there is one having an elastomer surface layer (JP-A-5-286399).
【０００７】いずれも作動時の破断を確実に行なうため
に破断部分を薄肉化したり、外層内部あるいは内層に溝
あるいはスリットを設けたものであり、一体成形により
製造されるので、補強材を埋め込んだものに比べて生産
効率が向上し、破砕性、外観、触感も良好であり、強度
の調整も容易に行なえるという利点がある。しかしなが
ら、２種以上の素材を用いてコア層および表層の二層成
形を行なう必要があるため、生産性には依然問題を有し
ており、また両層の物性が異なることから成形時あるい
は長期間の使用により変形やひび割れが発生するという
問題もある。In either case, the broken portion is thinned or a groove or slit is provided in the outer layer or in the inner layer in order to surely perform the breaking during operation. Since it is manufactured by integral molding, a reinforcing material is embedded. It has the advantages of higher production efficiency, better crushability, better appearance and feel, and easier strength adjustment. However, since it is necessary to perform two-layer molding of the core layer and the surface layer by using two or more kinds of materials, there is still a problem in productivity, and since the physical properties of both layers are different, there is a problem during or during molding. There is also a problem that deformation and cracks may occur due to use for a period of time.
【０００８】そこで、近年、補強材を使用しない単層タ
イプのカバーも提案されている。例えば、ポリエステル
系、ポリオレフィン系、ポリウレタン系、ポリアミド系
等の各種熱可塑性エラストマーからなり、表面部におけ
るエアーバッグの作動時に破断すべき部分に沿って薄肉
部を形成すると共に、その表面部の薄肉部に近い部分が
薄く外周部が厚くなるように厚さを変化させてなるもの
（特開平4-151348号）、カバーの構成材料がＪＩＳ Ａ
硬度（JIS K6301 ）が７０以上、曲げ弾性率（JIS K720
3 ）が5000kg／cm2 以下のオレフィン系及び／又はスチ
レン系熱可塑性エラストマーからなるもの（特開平4-31
4648号）、さらに、脆弱な構造（スリット、溝、薄肉部
など）の破断予定部分を有する、水素添加スチレン−共
役ジエン重合体（ＳＥＢＳ）とゴム用可塑剤（パラフィ
ン系オイル）とオレフィン系樹脂（ポリプロピレン）と
添加剤（酸化防止剤など）からなるＪＩＳ Ａ硬度（JI
S K6301 ）が６０〜８５の熱可塑性エラストマーの射出
成形体（特開平5-38996 号）等がある。Therefore, in recent years, a single-layer type cover that does not use a reinforcing material has also been proposed. For example, it is made of various thermoplastic elastomers such as polyester-based, polyolefin-based, polyurethane-based, polyamide-based, etc., and forms a thin portion along the portion of the surface portion that should be broken when the airbag is operated, and the thin portion of the surface portion The thickness of the cover is changed so that the portion close to the wall is thin and the outer peripheral portion is thick (JP-A-4-151348).
Hardness (JIS K6301) 70 or more, flexural modulus (JIS K720
3) consisting of olefin-based and / or styrene-based thermoplastic elastomer having a weight of 5000 kg / cm 2 or less (JP-A-4-31
4648), and hydrogenated styrene-conjugated diene polymer (SEBS), rubber plasticizer (paraffinic oil) and olefinic resin having a fragile structure (slit, groove, thin portion, etc.) to be broken. JIS A hardness (JI) consisting of (polypropylene) and additives (such as antioxidants)
There is an injection-molded article (Japanese Patent Laid-Open No. 5-38996) of a thermoplastic elastomer having S K6301) of 60 to 85.
【０００９】これらの組成物のうち、スチレン系の熱可
塑性エラストマー（スチレン−ブタジエンブロック共重
合体水素添加物，ＳＥＢＳ）を使用したものではＳＥＢ
Ｓがミクロ相分離構造を形成しやすく、スチレン成分が
ロッド状のラメラ構造をとる傾向がある。このため、射
出成形時にスチレンラメラの配向が縦方向と横方向にア
ンバランスとなり、機械的物性に差が生じやすく、均一
破壊が起こりにくいと考えられる。さらにこのＳＥＢＳ
を使用した組成物では制振性の指標となる力学損失正接
（ｔａｎδ）の分散ピークが室温付近に存在せず、制振
性が不充分である。また、前記特開平4-314648号には、
密度0.9 の非架橋型エチレンプロピレンゴム−ポリプロ
ピレン−ポリエチレンベースオレフィン系熱可塑性樹脂
組成物を使用したカバーが開示されているが、成形性お
よび低温特性が不充分である。Among these compositions, those using a styrene type thermoplastic elastomer (styrene-butadiene block copolymer hydrogenated product, SEBS) are SEB.
S tends to form a microphase-separated structure, and the styrene component tends to have a rod-shaped lamella structure. Therefore, it is considered that the orientation of the styrene lamella becomes unbalanced in the longitudinal direction and the lateral direction during the injection molding, the mechanical properties are likely to be different, and uniform fracture is unlikely to occur. Furthermore this SEBS
In the composition using, the dispersion peak of the mechanical loss tangent (tan δ), which is an index of the vibration damping property, does not exist near room temperature, and the vibration damping property is insufficient. Further, in the above-mentioned JP-A-4-314648,
Although a cover using a non-crosslinking type ethylene propylene rubber-polypropylene-polyethylene-based olefinic thermoplastic resin composition having a density of 0.9 is disclosed, moldability and low temperature characteristics are insufficient.
【００１０】従って、本発明の目的は、基本的に成形の
容易なポリオレフィン系の単一組成物からなる材料を使
用して、作動時には確実にカバーが破壊され、かつ破片
が飛散しないエアーバッグカバー材用オレフィン系熱可
塑性エラストマー組成物を提供することにある。また、
本発明の他の目的は、外観性、風合い、制振性、触感
（柔軟性）などの表面特性に優れ、寒冷地から熱帯地ま
での広い範囲の温度条件下で使用可能な耐候性を有し、
低温物性、特に低温での破断伸度に優れたエアーバッグ
カバー材用オレフィン系熱可塑性エラストマー組成物を
提供することにある。さらに、本発明の他の目的は、成
形性に優れ、エアーバッグカバー材を効率よく生産で
き、使用後にリサイクルが可能なオレフィン系熱可塑性
エラストマー組成物を提供することにある。Therefore, an object of the present invention is to use a material basically composed of a single polyolefin composition which is easy to mold, so that the cover is surely destroyed during operation and fragments are not scattered. An object is to provide an olefin-based thermoplastic elastomer composition for wood. Also,
Another object of the present invention is that it has excellent surface characteristics such as appearance, texture, vibration damping, and touch (flexibility), and has weather resistance that can be used in a wide range of temperature conditions from cold regions to tropical regions. Then
An object of the present invention is to provide an olefin-based thermoplastic elastomer composition for air bag cover materials, which is excellent in low-temperature physical properties, particularly in elongation at break at low temperatures. Further, another object of the present invention is to provide an olefin-based thermoplastic elastomer composition having excellent moldability, capable of efficiently producing an air bag cover material, and recyclable after use.
【００１１】[0011]
【課題を解決するための手段】本発明者らは、ポリプロ
ピレンおよびオレフィン系エラストマーからなるエアー
バッグカバー材用オレフィン系熱可塑性エラストマー組
成物について、鋭意研究を重ねた結果、ポリプロピレン
とエチレン系共重合体ゴムからなる組成物は、成形時に
おける配向が小さく均一な破壊開裂が可能であり、また
制振性の指標となる力学損失正接（ｔａｎδ）の分散ピ
ークが室温付近に存在し制振性が良好であることを見出
し、さらに、ポリプロピレンとして高流動性のもの、エ
チレン系共重合体ゴムとして高分子量のものを用い、鉱
油系軟化剤および脂肪酸系滑剤を添加配合した熱可塑性
エラストマー組成物、特にエチレン系共重合体ゴムに予
め鉱油系軟化剤を配合混練した組成物をポリプロピレン
および脂肪酸系滑剤と混練した組成物を使用することに
より、前記課題が解決されることを確認し本発明を完成
するに至った。[Means for Solving the Problems] The inventors of the present invention have conducted extensive studies on an olefin-based thermoplastic elastomer composition for polypropylene and an olefin-based elastomer for an air bag cover, and as a result, have found that polypropylene and an ethylene-based copolymer. A composition made of rubber has a small orientation during molding and is capable of uniform fracture cleavage, and has a dispersion peak of mechanical loss tangent (tan δ) near the room temperature, which is an index of vibration damping, and has good vibration damping. Further, it is found that a polypropylene having a high fluidity, an ethylene copolymer rubber having a high molecular weight is used, and a thermoplastic oil composition in which a mineral oil softener and a fatty acid lubricant are added and blended, particularly ethylene. A composition prepared by previously mixing and kneading a mineral oil-based softening agent with a system-based copolymer rubber was used to prepare a polypropylene and a fatty acid-based lubricant. And by using a composition obtained by kneading, thereby completing the present invention to verify that the problems can be solved.
【００１２】[0012]
【発明の構成】すなわち、本発明は以下のエアーバッグ
カバー材用オレフィン系熱可塑性エラストマー組成物を
提供する。 １） （ａ）メルトフローレート（２３０℃，2.16kg荷
重）２０〜２００ｇ／１０分のポリプロピレン２０〜８
０重量％と、（ｂ）ムーニー粘度（ＭＬ1+4 ，１００
℃）５０以上のエチレン系共重合体ゴム８０〜２０重量
％と、前記成分（ａ）と（ｂ）の合計１００重量部に対
して（ｃ）鉱油系軟化剤１〜２００重量部と（ｄ）脂肪
酸系滑剤0.2 〜2.0 重量部とを含有してなるエアーバッ
グカバー材用オレフィン系熱可塑性エラストマー組成
物。 ２） （ｂ）成分のエチレン系共重合体ゴムに（ｃ）成
分の鉱油系軟化剤を予め配合混練した油展組成物に
（ａ）成分のポリプロピレンと（ｄ）成分の脂肪酸系滑
剤とを混練して得られる前記１に記載のエアーバッグカ
バー材用オレフィン系熱可塑性エラストマー組成物。That is, the present invention provides the following olefinic thermoplastic elastomer composition for an air bag cover material. 1) (a) Melt flow rate (230 ° C., 2.16 kg load) 20 to 200 g / 10 min polypropylene 20 to 8
0% by weight, and (b) Mooney viscosity (ML 1 + 4 , 100
80 to 20% by weight of ethylene copolymer rubber having a temperature of 50 ° C. or more, and 1 to 200 parts by weight of (c) a mineral oil-based softening agent with respect to 100 parts by weight of the components (a) and (b). ) An olefinic thermoplastic elastomer composition for an air bag cover material, which comprises 0.2 to 2.0 parts by weight of a fatty acid lubricant. 2) The polypropylene of the component (a) and the fatty acid lubricant of the component (d) are added to the oil-extended composition in which the ethylene-based copolymer rubber of the component (b) is mixed and kneaded with the mineral oil-based softener of the component (c) in advance. The olefinic thermoplastic elastomer composition for an air bag cover material as described in 1 above, which is obtained by kneading.
【００１３】３） （ａ）成分と（ｂ）成分との配合割
合が、（ａ）２５〜７０重量％、（ｂ）７５〜３０重量
％であり、（ｃ）成分の配合量が成分（ａ）と（ｂ）の
合計１００重量部に対して１０〜１２０重量部である前
記１または前記２に記載のエアーバッグカバー材用オレ
フィン系熱可塑性エラストマー組成物。 ４） ＪＩＳ Ａ硬度（JIS K6301 ）が８０以上、曲げ
弾性率（JIS K7203 ）が５００〜２５００kg／cm2 であ
る前記１乃至３のいずれかに記載のエアーバッグカバー
材用オレフィン系熱可塑性エラストマー組成物。3) The blending ratio of the component (a) and the component (b) is 25 to 70% by weight (a) and 75 to 30% by weight, and the blending amount of the component (c) is the component ( The olefinic thermoplastic elastomer composition for an air bag cover material according to 1 or 2 above, which is 10 to 120 parts by weight based on 100 parts by weight of a) and (b) in total. 4) The olefin-based thermoplastic elastomer composition for an air bag cover material according to any one of 1 to 3 above, which has a JIS A hardness (JIS K6301) of 80 or more and a flexural modulus (JIS K7203) of 500 to 2500 kg / cm 2. object.
【００１４】[0014]
【組成物の成分】以下、本発明のエアーバッグカバー材
用オレフィン系熱可塑性エラストマー組成物について説
明する。本発明のエアーバッグカバー材用オレフィン系
熱可塑性エラストマー組成物は（ａ）ポリプロピレン
と、（ｂ）エチレン系共重合体ゴムと、（ｃ）鉱油系軟
化剤と、（ｄ）脂肪酸系滑剤とを含有する。[Composition Components] The olefinic thermoplastic elastomer composition for air bag cover materials of the present invention will be described below. The olefinic thermoplastic elastomer composition for an air bag cover material of the present invention comprises (a) polypropylene, (b) ethylene copolymer rubber, (c) mineral oil softener, and (d) fatty acid lubricant. contains.
【００１５】（ａ）成分のポリプロピレンは、アイソタ
チックポリプロピレン、またはポリプロピレンとエチレ
ン、ブテン−１、ヘキセン−１等のα−オレフィンとの
ランダムあるいはブロック共重合体であってポリプロピ
レンが結晶部分を構成するものである。メルトフローレ
ート（ＭＦＲ）（２３０℃，2.16kg荷重）は２０ｇ／１
０分以上のものであり、２０〜２００ｇ／１０分のもの
が好ましい。ＭＦＲが２０ｇ／１０分未満のものを用い
た場合、成形性が悪化する。The polypropylene as the component (a) is an isotactic polypropylene or a random or block copolymer of polypropylene and an α-olefin such as ethylene, butene-1, hexene-1, and the polypropylene constitutes a crystal part. To do. Melt flow rate (MFR) (230 ℃, 2.16kg load) is 20g / 1
It is 0 minutes or more, and preferably 20 to 200 g / 10 minutes. If the MFR of less than 20 g / 10 minutes is used, the moldability is deteriorated.
【００１６】本発明で使用される（ｂ）成分のエチレン
系共重合体ゴムとは、エチレンを主成分とする無定型ラ
ンダムな弾性共重合体であり、例えばエチレン−プロピ
レン共重合体ゴム（ＥＰＲ）、エチレン−１−ブテン共
重合体ゴム（ＥＢＲ）、エチレン−プロピレン−非共役
ジエン共重合体ゴム（ＥＰＤＭ）のようなゴムが挙げら
れる。The ethylene-based copolymer rubber of the component (b) used in the present invention is an amorphous random elastic copolymer containing ethylene as a main component, for example, an ethylene-propylene copolymer rubber (EPR). ), Ethylene-1-butene copolymer rubber (EBR), and ethylene-propylene-non-conjugated diene copolymer rubber (EPDM).
【００１７】ここで、ＥＰＤＭの非共役ジエンモノマー
は炭素数５〜２０の非共役ジエンであり、例えば１，４
−ペンタジエン、１，４−ヘキサジエン、１，５−ヘキ
サジエン、２，５−ジメチル−１，５−ヘキサジエンお
よび１，４−オクタジエンや、例えば１，４−シクロヘ
キサジエン、シクロオクタジエン、ジシクロペンタジエ
ンなどの環状ジエン、例えば５−エチリデン−２−ノル
ボルネン、５−ブチリデン−２−ノルボルネン、２−メ
タリル−５−ノルボルネンおよび２−イソプロペニル−
５−ノルボルネンなどのアルケニルノルボルネン等が挙
げられる。上記ゴムの中ではＥＰＲおよびＥＰＤＭが好
ましく、特に耐熱性、引張特性および反発弾性が優れた
組成物を与える点から非共役ジエンとしてエチリデンノ
ルボルネンを用いたＥＰＤＭが好ましい。Here, the non-conjugated diene monomer of EPDM is a non-conjugated diene having 5 to 20 carbon atoms, for example, 1,4
-Pentadiene, 1,4-hexadiene, 1,5-hexadiene, 2,5-dimethyl-1,5-hexadiene and 1,4-octadiene, for example, 1,4-cyclohexadiene, cyclooctadiene, dicyclopentadiene, etc. A cyclic diene such as 5-ethylidene-2-norbornene, 5-butylidene-2-norbornene, 2-methallyl-5-norbornene and 2-isopropenyl-
Examples thereof include alkenyl norbornene such as 5-norbornene. Among the above rubbers, EPR and EPDM are preferable, and EPDM using ethylidene norbornene as a non-conjugated diene is preferable from the viewpoint of providing a composition having excellent heat resistance, tensile properties and impact resilience.
【００１８】ＥＰＤＭを構成するコモノマーの割合は、
エチレン含有率が５０〜８０重量％、好ましくは５５〜
７０重量％、プロピレン含有率が２０〜５０重量％、好
ましくは２５〜４０重量％、ジエン化合物含有率が１〜
２０重量％、好ましくは２〜１０重量％である。ヨウ素
価は３〜７０が好ましい。また、ムーニー粘度（ＭＬ
1+4 ，１００℃）は５０以上であり、１００以上が好ま
しい。ムーニー粘度が５０未満の低分子量のＥＰＤＭで
はオイル（鉱油系軟化剤）の抱き込み性が悪くなるでの
好ましくない。The proportion of comonomer composing EPDM is
Ethylene content is 50-80% by weight, preferably 55-
70% by weight, propylene content is 20 to 50% by weight, preferably 25 to 40% by weight, diene compound content is 1 to
It is 20% by weight, preferably 2 to 10% by weight. The iodine value is preferably 3 to 70. Also, the Mooney viscosity (ML
1 + 4 , 100 ° C.) is 50 or more, preferably 100 or more. A low molecular weight EPDM having a Mooney viscosity of less than 50 is not preferable because the embracing property of oil (mineral oil-based softening agent) is deteriorated.
【００１９】（ｃ）成分の鉱油系軟化剤は、ゴムをロー
ル加工する際、ゴムの分子間作用力を弱め、加工を容易
にすると共に、カーボンブラック、ホワイトカーボン等
の分散を助け、また熱可塑性エラストマーの流動性およ
び柔軟性を改善する。具体例としては、パラフィン系、
ナフテン系、芳香族系等の石油系軟化剤、重合した高沸
点強芳香族系オイル、流動パラフィン、ホワイトオイル
などが挙げられる。これらの中でも、石油系軟化剤が好
ましい。（ｃ）成分を配合することにより、成形性が向
上するのみでなく、エアーバッグ収納用カバーの風合
い、触感、柔軟性、さらには低温物性も向上する。The mineral oil-based softening agent as the component (c) weakens the intermolecular action force of the rubber during roll processing of the rubber, facilitates the processing, and assists the dispersion of carbon black, white carbon, etc. Improves flowability and flexibility of plastic elastomers. As a specific example, paraffinic,
Examples include naphthene-based and aromatic petroleum-based softening agents, polymerized high-boiling strong aromatic oils, liquid paraffin, and white oil. Among these, petroleum-based softeners are preferable. By blending the component (c), not only the moldability is improved, but also the texture, feel, flexibility and low-temperature physical properties of the air bag storage cover are improved.
【００２０】（ｄ）成分の脂肪酸系滑剤は加工成形時の
剥離性を向上させるものであり、具体的にはステアリン
酸アミド、エルカ酸アミド、オレイン酸アミド、メチレ
ンビスステアロアミド、エチレンビスステアロアミドお
よびこれらの混合物、または含有物があり、成形加工温
度等の使用条件により選択することができる。これらの
中では特にエルカ酸アミドが好ましい。Component (d), a fatty acid-based lubricant, improves the releasability during processing and molding. Specifically, stearic acid amide, erucic acid amide, oleic acid amide, methylenebisstearamide, ethylenebisstear. There are amides and mixtures or inclusions thereof, which can be selected depending on the use conditions such as molding temperature. Among these, erucic acid amide is particularly preferable.
【００２１】本発明では上記した成分以外にも、所望に
より他の成分を配合することができる。例えばカーボン
ブラックを添加することにより着色と同時に良好な耐候
性を得ることができる。また、炭酸カルシウム、タル
ク、カオリン、マイカ、ガラス繊維、合成繊維などのフ
ィラーを加えることによって成形時の寸法安定性、離型
性等を向上させることができる。さらに、紫外線吸収
剤、加工助剤、熱安定剤、光安定剤、難燃剤、帯電防止
剤、造核剤等成形用樹脂組成物の分野で使用されている
添加剤を通常の割合で適宜配合することができる。In the present invention, in addition to the above components, other components can be blended if desired. For example, by adding carbon black, good weatherability can be obtained at the same time as coloring. Further, by adding a filler such as calcium carbonate, talc, kaolin, mica, glass fiber or synthetic fiber, it is possible to improve dimensional stability during molding, releasability and the like. Furthermore, ultraviolet absorbers, processing aids, heat stabilizers, light stabilizers, flame retardants, antistatic agents, nucleating agents, and the like, which are used in the field of molding resin compositions, are appropriately added in the usual proportions. can do.
【００２２】[0022]
【各成分の配合割合】各成分の配合割合は、まず（ａ）
ポリプロピレンと（ｂ）エチレン系共重合体ゴムとの割
合は（ａ）成分が２０〜８０重量％、好ましくは２５〜
７０重量％で、成分（ｂ）が８０〜２０重量％、好まし
くは７５〜３０重量％である。（ｃ）鉱油系軟化剤の配
合量は、前記成分（ａ）と（ｂ）との合計１００重量部
に対して、１〜２００重量部、好ましくは１０〜１２０
重量部である。また（ｄ）脂肪酸系滑剤の配合量は、前
記成分（ａ）と（ｂ）との合計１００重量部に対して、
0.2 〜2.0 重量部である。[Blending ratio of each component] The mixing ratio of each component is (a)
The proportion of polypropylene and (b) the ethylene-based copolymer rubber is 20 to 80% by weight, preferably 25 to 80% by weight of the component (a).
70% by weight, 80 to 20% by weight of component (b), preferably 75 to 30% by weight. The blending amount of the (c) mineral oil-based softening agent is 1 to 200 parts by weight, preferably 10 to 120 parts by weight, based on 100 parts by weight of the components (a) and (b).
Parts by weight. The amount of the (d) fatty acid-based lubricant compounded is 100 parts by weight based on the total of the components (a) and (b).
0.2 to 2.0 parts by weight.
【００２３】成分（ａ）（ポリプロピレン）が２０重量
％未満だと（成分（ｂ）（エチレン系共重合体ゴム）が
８０重量％を超えると）、得られる熱可塑性エラストマ
ーの流動性が低くなるため成形性が低下し、反対に成分
（ａ）が８０重量％を超えると（成分（ｂ）が２０重量
％未満だと）機械的強度が高くなりすぎ、カバーの破壊
想定部分の厚みを薄くする必要があり成形加工が困難と
なり、また光沢が発生するなど外観がプラスチックライ
クとなり、触感も悪化する。When the content of the component (a) (polypropylene) is less than 20% by weight (when the content of the component (b) (ethylene copolymer rubber) exceeds 80% by weight), the fluidity of the resulting thermoplastic elastomer becomes low. For this reason, the moldability is lowered, and conversely, when the component (a) exceeds 80% by weight (when the component (b) is less than 20% by weight), the mechanical strength becomes too high, and the thickness of the portion where the cover is supposed to be broken is thin. Therefore, the molding process becomes difficult, and the appearance becomes plastic-like, such as gloss, and the touch is deteriorated.
【００２４】成分（ｃ）（鉱油系軟化剤）の配合量が１
重量部未満だと配合による効果が表われず、２００重量
部を超えると成形物が変形したり、成形後に滲出（ブリ
ードアウト）が発生したり、耐候性が悪化するので好ま
しくない。The amount of component (c) (mineral oil-based softening agent) compounded is 1
If it is less than 100 parts by weight, the effect due to the compounding is not exhibited, and if it exceeds 200 parts by weight, the molded product is deformed, bleeding out occurs after molding, and the weather resistance deteriorates, which is not preferable.
【００２５】また、成分（ｄ）（脂肪酸系滑剤）の配合
量が0.2 重量部未満だと配合による効果が表われず、2.
0 重量部を超えるとブリードアウトし、離型性も悪化す
る。If the amount of the component (d) (fatty acid-based lubricant) is less than 0.2 parts by weight, the effect of the combination is not exhibited, and 2.
If it exceeds 0 parts by weight, bleeding out occurs and the releasability also deteriorates.
【００２６】[0026]
【組成物の製造方法】本発明のエアーバッグカバー材用
オレフィン系熱可塑性エラストマー組成物は、各成分を
上記の割合で、また、その他の添加剤を適宜使用して配
合混練することにより製造することができるが、配合混
練の操作手順を工夫することによって、製造プロセスが
簡略化されると共に、一層好ましい物性を有する組成物
を得ることができる。すなわち、混練は通常は一括して
配合することにより行なうことができるが、本発明にお
いては予め（ｂ）エチレン系共重合体ゴムに（ｃ）鉱油
系軟化剤を配合混練した油展物を調製し、これに（ａ）
ポリプロピレンおよび（ｄ）脂肪酸系滑剤を配合混練す
ることが好ましい。[Production Method of Composition] The olefinic thermoplastic elastomer composition for air bag cover material of the present invention is produced by blending and kneading the respective components in the above proportions and other additives as appropriate. However, by devising the operation procedure of compounding and kneading, the production process can be simplified and a composition having more preferable physical properties can be obtained. That is, the kneading can be usually carried out by blending all at once, but in the present invention, an oil extended product is prepared by previously blending (b) the ethylene copolymer rubber with the (c) mineral oil-based softening agent. And then (a)
It is preferable to mix and knead polypropylene and (d) a fatty acid-based lubricant.
【００２７】エチレン系共重合体ゴムと鉱油系軟化剤を
別個の成分として配合する場合には、鉱油系軟化剤の貯
蔵用タンク、ポンプ、予熱装置等の設備が必要となる
が、油展物を使用する場合には組成物の混練時間が短縮
できることや（別個の成分として配合した場合の約２／
３の時間で混練できる。）、エチレン系共重合体ゴムお
よび鉱油系軟化剤の分散性を高めることができ、物性が
向上するだけでなく、生産性の向上、コストの節減が可
能となる。具体的には、例えば、エチレン系共重合体ゴ
ムと鉱油系軟化剤をニーダーにて混練後、または予めＥ
ＰＤＭと鉱油系軟化剤を所定の割合で含有させた油展Ｅ
ＰＤＭを調製後、ポリプロピレン等の成分を二軸押出機
およびホットカッターを用いる方法、あるいはニーダー
またはバンバリーミキサーで混練後、フィーダールーダ
ー、単軸押出機およびホットカッターを用いる方法によ
り製造することができる。When the ethylene-based copolymer rubber and the mineral oil-based softening agent are blended as separate components, facilities such as a tank for storing the mineral oil-based softening agent, a pump, and a preheating device are required. When using, it is possible to shorten the kneading time of the composition and (about 2 / when compared as a separate component)
Can be kneaded in 3 hours. ), The dispersibility of the ethylene-based copolymer rubber and the mineral oil-based softening agent can be enhanced, and not only the physical properties are improved, but also the productivity and the cost can be reduced. Specifically, for example, after kneading the ethylene copolymer rubber and the mineral oil softener with a kneader, or E in advance.
Oil-extended E containing PDM and mineral oil-based softener in a prescribed ratio
After the PDM is prepared, components such as polypropylene can be produced by a method using a twin-screw extruder and a hot cutter, or by kneading with a kneader or a Banbury mixer and then using a feeder ruder, a single-screw extruder and a hot cutter.
【００２８】エアーバッグカバー材用として利用される
本発明のオレフィン系熱可塑性エラストマー組成物は、
ＪＩＳ Ａ硬度（JIS K6301 ）として８０以上、曲げ弾
性率（JIS K7203 ）として５００〜２５００kg／cm2 の
ものが特に好ましい。硬度が低いと変形を起こしやすく
保形性に劣り、また曲げ弾性率が高くなるとエアーバッ
グ膨脹の際のカバー開裂破壊が困難となる。The olefinic thermoplastic elastomer composition of the present invention used as an air bag cover material is
Those having a JIS A hardness (JIS K6301) of 80 or more and a flexural modulus (JIS K7203) of 500 to 2500 kg / cm 2 are particularly preferable. If the hardness is low, deformation is likely to occur and the shape retention is poor, and if the flexural modulus is high, it is difficult to break the cover when the airbag is inflated.
【００２９】本発明のエアーバッグカバー材用オレフィ
ン系熱可塑性エラストマー組成物をエアーバッグ収納用
カバーに成形する方法としては、通常行なわれている方
法でよく、例えばエアーバッグの作動時に破断部分とな
る薄肉部を内面が例えばＨ字状の凹部となるような金型
を使用して、射出成形などの一般的な成形法により成形
する。The method of molding the olefinic thermoplastic elastomer composition for an air bag cover material of the present invention into an air bag storage cover may be a commonly used method. The thin portion is molded by a general molding method such as injection molding using a mold whose inner surface becomes a recess having an H shape, for example.
【００３０】[0030]
【実施例】以下、実施例および比較例により本発明をさ
らに詳細に説明するが、本発明は下記の記載により限定
されるものではない。なお、各実施例および比較例にお
いて、樹脂原料および添加剤としては、以下のものを使
用した。The present invention will be described in more detail with reference to Examples and Comparative Examples, but the present invention is not limited to the following description. In addition, in each of Examples and Comparative Examples, the following materials were used as the resin raw material and the additive.
【００３１】（ａ）ポリプロピレン（ＰＰ）：ＭＦＲ
（２３０℃，2.16荷重）８０ｇ／１０分、 （ｂ）エチレン−プロピレン−非共役ジエン共重合体
（ＥＰＤＭ）：プロピレン含量２８重量％，ヨウ素価１
５，ムーニー粘度（ＭＬ1+4 、１００℃）３２０。 （ｃ）鉱油軟化剤（オイル）：パラフィン系鉱物油（Ｐ
Ｗ−３８０，出光（株）製）。 （ｄ）脂肪酸系滑剤（滑剤）：脂肪酸アミド系滑剤（ス
ラクトールＷＢ−１６，Schill and Seilacher社製）。 （ｅ）スチレン−ブタジエンブロック共重合体水素添加
物（ＳＥＢＳ）：スチレン含量３０重量％，ＭＦＲ（２
３０℃，2.16荷重）１０ｇ／１０分。(A) Polypropylene (PP): MFR
(230 ° C., 2.16 load) 80 g / 10 minutes, (b) ethylene-propylene-non-conjugated diene copolymer (EPDM): propylene content 28% by weight, iodine value 1
5, Mooney viscosity (ML 1 + 4 , 100 ° C.) 320. (C) Mineral oil softener (oil): paraffinic mineral oil (P
W-380, manufactured by Idemitsu Co., Ltd. (D) Fatty acid-based lubricant (lubricant): Fatty acid amide-based lubricant (Sractol WB-16, manufactured by Schill and Seilacher). (E) Styrene-butadiene block copolymer hydrogenated product (SEBS): styrene content 30% by weight, MFR (2
30 ° C, 2.16 load) 10g / 10 minutes.
【００３２】実施例１ （ａ）ポリプロピレン（ＰＰ）３０重量部、（ｂ）エチ
レン系共重合体ゴム（ＥＰＤＭ）７０重量部、（ｃ）鉱
油系軟化剤（オイル）５２重量部および（ｄ）脂肪酸系
滑剤（滑剤）0.5 重量部をニーダーにて混練後、樹脂温
度２２０℃で二軸押出機にて溶融混練しホットカッター
で切断してオレフィン系熱可塑性エラストマー組成物を
得た。この組成物を成形して物性測定用のサンプルを作
成し、エアーバッグカバー材の指標となる物性（ＭＦ
Ｒ、ＪＩＳ Ａ硬度、破断強度（ＴＢ）、引裂強度（Ｔ
Ｒ）、アイゾット衝撃強度、破断伸度、曲げ弾性率、制
振性、成形性）を測定した。各成分の配合割合と共に測
定結果を表１に示す。 Example 1 (a) 30 parts by weight of polypropylene (PP), (b) 70 parts by weight of ethylene copolymer rubber (EPDM), (c) 52 parts by weight of a mineral oil softener (oil) and (d). After kneading 0.5 part by weight of a fatty acid lubricant (lubricant) with a kneader, the mixture was melt-kneaded with a twin screw extruder at a resin temperature of 220 ° C. and cut with a hot cutter to obtain an olefinic thermoplastic elastomer composition. This composition is molded to prepare a sample for measuring physical properties, and the physical properties (MF as an index of the air bag cover material are used.
R, JIS A hardness, breaking strength (TB), tear strength (T
R), Izod impact strength, elongation at break, flexural modulus, damping property, and moldability) were measured. Table 1 shows the measurement results together with the blending ratio of each component.
【００３３】実施例２ （ｂ）ＥＰＤＭと（ｃ）オイルを予めニーダーにて溶融
温度２００℃で２０分間混練し、オイルを含有した油展
ＥＰＤＭとしたこと以外は実施例１と同様の方法でエア
ーバッグカバー材用オレフィン系熱可塑性エラストマー
組成物を得た。この組成物を成形して物性測定用のサン
プルを作成し、各物性を測定した。各成分の配合割合と
共に、結果を表１に示す。 Example 2 (b) EPDM and (c) oil were kneaded in advance with a kneader at a melting temperature of 200 ° C. for 20 minutes to obtain an oil-extended EPDM, except that oil-extended EPDM was used. An olefinic thermoplastic elastomer composition for an air bag cover material was obtained. This composition was molded to prepare a sample for measuring physical properties, and each physical property was measured. The results are shown in Table 1 together with the blending ratio of each component.
【００３４】実施例３ （ａ）ＰＰを５０重量部、（ｂ）ＥＰＤＭを５０重量
部、（ｃ）オイル３９重量部としたこと以外は実施例２
と同様にしてエアーバッグカバー材用オレフィン系熱可
塑性エラストマー組成物を得た。この組成物から物性測
定用のサンプル作成し、各物性を測定した。各成分の配
合割合と共に測定結果を表１に示す。 Example 3 Example 2 except that (a) PP was 50 parts by weight, (b) EPDM was 50 parts by weight, and (c) oil was 39 parts by weight.
An olefinic thermoplastic elastomer composition for an air bag cover material was obtained in the same manner as in. A sample for measuring physical properties was prepared from this composition, and each physical property was measured. Table 1 shows the measurement results together with the blending ratio of each component.
【００３５】実施例４ （ａ）ＰＰを７０重量部、（ｂ）ＥＰＤＭを３０重量
部、（ｃ）オイル２１重量部としたこと以外は実施例２
と同様の方法でエアーバッグカバー材用オレフィン系熱
可塑性エラストマー組成物を得た。この組成物から物性
測定用のサンプルを作成し、各物性を測定した。各成分
の配合割合と共に測定結果を表１に示す。 Example 4 Example 2 except that (a) PP was 70 parts by weight, (b) EPDM was 30 parts by weight, and (c) oil was 21 parts by weight.
An olefinic thermoplastic elastomer composition for an air bag cover material was obtained in the same manner as in (1). A sample for measuring physical properties was prepared from this composition, and each physical property was measured. Table 1 shows the measurement results together with the blending ratio of each component.
【００３６】実施例５ （ｃ）オイルを成分（ａ）と（ｂ）の合計１００重量部
に対して８３重量部としたこと以外は実施例１と同様の
方法で溶融混練し、ホットカッターで切断してエアーバ
ッグカバー材用オレフィン系熱可塑性エラストマー組成
物を得た。この組成物を物性測定用のサンプルに成形
し、各物性を測定した。各成分の配合割合と共に測定結
果を表１に示す。 Example 5 (c) Melt kneading was carried out in the same manner as in Example 1 except that the amount of the oil (c) was 83 parts by weight based on 100 parts by weight of the components (a) and (b) in total, and a hot cutter was used. It was cut to obtain an olefinic thermoplastic elastomer composition for an air bag cover material. This composition was molded into a sample for measuring physical properties, and each physical property was measured. Table 1 shows the measurement results together with the blending ratio of each component.
【００３７】比較例１ （ａ）ＰＰを１０重量部、（ｂ）ＥＰＤＭを９０部、
（ｃ）オイルを６８重量部としたこと以外は実施例２と
同様の方法でエアーバッグカバー材用オレフィン系熱可
塑性エラストマー組成物を得た。この組成物から物性測
定用のサンプルを作成し、各物性を測定した。各成分の
配合割合と共に測定結果を表１に示す。 Comparative Example 1 (a) 10 parts by weight of PP, (b) 90 parts of EPDM,
(C) An olefinic thermoplastic elastomer composition for an air bag cover material was obtained by the same method as in Example 2 except that 68 parts by weight of oil was used. A sample for measuring physical properties was prepared from this composition, and each physical property was measured. Table 1 shows the measurement results together with the blending ratio of each component.
【００３８】比較例２ （ａ）ＰＰを８８重量部、（ｂ）ＥＰＤＭを１２重量
部、（ｃ）オイルを９重量部としたこと以外は実施例２
と同様の方法でエアーバッグカバー材用オレフィン系熱
可塑性エラストマー組成物を得た。この組成物を物性測
定用のサンプルに成形し、各物性を測定した。各成分の
配合割合と共に測定結果を表１に示す。 Comparative Example 2 Example 2 except that (a) PP was 88 parts by weight, (b) EPDM was 12 parts by weight, and (c) oil was 9 parts by weight.
An olefinic thermoplastic elastomer composition for an air bag cover material was obtained in the same manner as in (1). This composition was molded into a sample for measuring physical properties, and each physical property was measured. Table 1 shows the measurement results together with the blending ratio of each component.
【００３９】比較例３ （ａ）ＰＰを３０重量部、ゴム成分として（ｅ）ＳＥＢ
Ｓを７０重量部、（ｄ）滑剤を0.5 重量部をニーダーに
て混練後、樹脂温度２２０℃で二軸押出機にて溶融混練
し、ホットカターで切断してエアーバッグカバー材用オ
レフィン系熱可塑性エラストマー組成物を得た。この組
成物を物性測定用のサンプルに成形し、各物性を測定し
た。各成分の配合割合と共に測定結果を表１に示す。 Comparative Example 3 (a) 30 parts by weight of PP and (e) SEB as a rubber component
70 parts by weight of S and 0.5 parts by weight of (d) lubricant were kneaded in a kneader, melt-kneaded in a twin-screw extruder at a resin temperature of 220 ° C., cut with a hot cutter and olefinic thermoplastic for air bag cover material. An elastomer composition was obtained. This composition was molded into a sample for measuring physical properties, and each physical property was measured. Table 1 shows the measurement results together with the blending ratio of each component.
【００４０】比較例４ （ｃ）成分のオイル添加しないこと以外は実施例２と同
様の方法でエアーバッグカバー材用オレフィン系熱可塑
性エラストマー組成物を得た。この組成物から物性測定
用のサンプルを作成し、各物性を測定した。各成分の配
合割合と共に測定結果を表１に示す。 Comparative Example 4 An olefinic thermoplastic elastomer composition for an air bag cover material was obtained in the same manner as in Example 2 except that the component (c) oil was not added. A sample for measuring physical properties was prepared from this composition, and each physical property was measured. Table 1 shows the measurement results together with the blending ratio of each component.
【００４１】[0041]
【表１】 [Table 1]
【００４２】表１に示した各物性の測定および評価方法
は以下のとおりである。 (1) ＭＦＲ（ｇ／１０分）：２３０℃，2.16kg荷重で測
定。 (2) ＪＩＳ Ａ硬度：JIS K6301 により測定。 (3) 破断強度（ＴＢ）（ｋｇ／ｃｍ2 ）：JIS K6301 に
より測定。 (4) 引裂強度（ＴＲ）（ｋｇ／ｃｍ2 ）：ASTM D624-54
により測定。 (5) アイゾット衝撃強度（ｋｇ・ｃｍ／ｃｍ2 ）：JIS
K6301 （ノッチ付）により測定（−４０℃および−５０
℃）し、破壊の有無を観察した。 ＮＢ：破壊せず、 ×：破壊。 (6) 破断伸度（％）：JIS K6301 により測定（−４０℃
および２３℃）。 (7) 曲げ弾性率（ｋｇ／ｃｍ2 ）：JIS K7203 により測
定。The methods for measuring and evaluating the physical properties shown in Table 1 are as follows. (1) MFR (g / 10 minutes): Measured at 230 ° C and 2.16 kg load. (2) JIS A hardness: Measured according to JIS K6301. (3) Breaking strength (TB) (kg / cm 2 ): Measured according to JIS K6301. (4) Tear strength (TR) (kg / cm 2 ): ASTM D624-54
Measured by. (5) Izod impact strength (kg · cm / cm 2 ): JIS
Measured with K6301 (notched) (-40 ° C and -50
℃) and observed the presence or absence of breakage. NB: not destroyed, x: destroyed. (6) Elongation at break (%): Measured according to JIS K6301 (-40 ° C
And 23 ° C). (7) Flexural modulus (kg / cm 2 ): Measured according to JIS K7203.
【００４３】(8) 制振性：固体粘弾性測定装置により、
−１５０℃〜２００℃の範囲で５℃毎に１ヘルツ（Ｈ
ｚ）の定周波を組成物に与え、各温度における貯蔵弾性
率および損失弾性率を測定し、その値より算出した力学
損失正接（ｔａｎδ）と温度により得た分散カーブによ
り以下の基準で評価した。 ○：ｔａｎδの分散カーブが−５〜３０℃の温度範囲に
あるもの、 ×：ｔａｎδの分散カーブが−５〜３０℃の温度範囲外
にあるもの。(8) Damping property: With a solid viscoelasticity measuring device,
1 Hertz (H) every 5 ° C in the range of -150 ° C to 200 ° C
The constant frequency of z) was given to the composition, the storage elastic modulus and the loss elastic modulus at each temperature were measured, and the dispersion loss obtained by the mechanical loss tangent (tan δ) and temperature calculated from the values was evaluated according to the following criteria. . ◯: A dispersion curve of tan δ is in the temperature range of −5 to 30 ° C., ×: Dispersion curve of tan δ is outside the temperature range of −5 to 30 ° C.
【００４４】(9) 成形性：２２０℃における高速剪断時
に測定（キャピラリーレオメーター（東洋精機製作所
製）により剪断速度１０００／秒にて測定）した粘度に
より、成形性を以下の基準で評価した。 ◎：９００poise 以下、 ○：９００poise を超え１２００poise 以下、 △：１２００poise を超え１５００poise 以下、 ×：１５００poise を超えるもの。(9) Formability: The formability was evaluated according to the following criteria by the viscosity measured at a high-speed shearing at 220 ° C. (measured by a capillary rheometer (manufactured by Toyo Seiki Seisakusho, Ltd. at a shearing rate of 1000 / sec)). ⊚: 900 poise or less, ◯: 900 poise to 1200 poise or less, Δ: 1200 poise to 1500 poise or less, ×: 1500 poise or more.
【００４５】表１より明らかなように、ＥＰＤＭの割合
が多いと（比較例１）曲げ弾性率は良好であるが流動性
が低くなるため成形性、生産性に劣り、一方ＰＰの割合
が多いと（比較例２）曲げ弾性率、破断強度および引裂
強度が高くなるため作動時の瞬間的な破壊性が問題とな
り、かつ低温物性（アイゾット衝撃強度：−４０℃，−
５０℃）および制振性が劣り好ましくない。ゴム成分と
してＳＥＢＳを用いると（比較例３）、低温物性および
制振性に劣り、また鉱油系軟化剤を加えていないもので
は（比較例４）低温物性および成形性に劣り好ましくな
い。これに対して本発明のエアーバッグカバー材用オレ
フィン系熱可塑性エラストマー組成物は（実施例１〜
５）は引裂強度が低く、破断伸度、曲げ弾性率、流動性
等の物性バランスに優れ、特に低温物性および制振性に
優れた物性を示している。特に、ＥＰＤＭに鉱油系軟化
剤を予め配合混練した油展物をポリプロピレンと滑剤に
配合混練したものは（実施例２）は、これら成分を一括
して混練したもの（実施例１）よりも物性が向上してい
る。As is clear from Table 1, when the proportion of EPDM is high (Comparative Example 1), the flexural modulus is good, but the fluidity is low, so the moldability and productivity are poor, while the proportion of PP is high. (Comparative Example 2) Since the flexural modulus, the breaking strength and the tear strength are increased, the instantaneous breakage during operation becomes a problem, and the low temperature physical properties (Izod impact strength: -40 ° C,-
50 ° C.) and the vibration damping property are poor, which is not preferable. When SEBS is used as the rubber component (Comparative Example 3), low temperature physical properties and vibration damping properties are poor, and when no mineral oil-based softening agent is added (Comparative Example 4) low temperature physical properties and moldability are poor, which is not preferable. On the other hand, the olefinic thermoplastic elastomer composition for an air bag cover material of the present invention is
5) has a low tear strength, an excellent balance of physical properties such as elongation at break, flexural modulus and fluidity, and particularly excellent physical properties at low temperatures and vibration damping properties. In particular, the one obtained by mixing and kneading the oil-extended product obtained by previously mixing and kneading the EPDM with the mineral oil-based softening agent and the polypropylene and the lubricant (Example 2) has more physical properties than those obtained by kneading these components all together (Example 1). Has improved.
【００４６】[0046]
【発明の効果】本発明のエアーバッグカバー材用オレフ
ィン系熱可塑性エラストマー組成物は、メルトフローレ
ート（２３０℃，2.16kg荷重）が２０〜２００ｇ／１０
分の高流動性ポリプロピレンと、ムーニー粘度（ＭＬ
1+4 ，１００℃）が５０以上の高分子量エチレン系共重
合体と、鉱油系軟化剤と、脂肪酸系滑剤とを配合、混練
した組成物である。本発明のエアーバッグカバー材用組
成物はオレフィン系系熱可塑性樹脂組成物のみを使用す
るものであり、これにより作成したエアーバッグカバー
は作動時には確実に破壊され、ネットなどの補助材を使
用しなくても破片が飛び散らず、広い温度範囲において
確実に作動し、柔軟性も保ち、表面性、成形性に優れ、
−５０℃という低温においても脆化はみられず温度適応
性にも優れている。また、従来のスチレン系熱可塑性エ
ラストマー（ＳＥＢＳ等）を用いたものに比べて使用頻
度の高い温度域（１０〜２５℃）での制振性に優れるほ
か、オレフィン系樹脂組成物を使用しているため効率良
く生産でき、また使用後のリサイクルも可能である。The olefinic thermoplastic elastomer composition for air bag cover material of the present invention has a melt flow rate (230 ° C., 2.16 kg load) of 20 to 200 g / 10.
Minute high flow polypropylene and Mooney viscosity (ML
1 + 4 , 100 ° C.) is 50 or more, and a composition obtained by mixing and kneading a high molecular weight ethylene copolymer, a mineral oil softener, and a fatty acid lubricant. The composition for an air bag cover material of the present invention uses only an olefinic thermoplastic resin composition, and the air bag cover created by this is reliably destroyed during operation, and an auxiliary material such as a net is used. Even if it is not used, fragments will not scatter, operate reliably in a wide temperature range, maintain flexibility, excellent surface property and moldability,
No brittleness is observed even at a low temperature of -50 ° C, and the temperature adaptability is excellent. Further, in addition to being superior in vibration damping in a temperature range (10 to 25 ° C.) in which the frequency of use is high, the olefin resin composition is used as compared with a conventional styrene thermoplastic elastomer (SEBS etc.). Therefore, it can be efficiently produced and can be recycled after use.
─────────────────────────────────────────────────────
─────────────────────────────────────────────────── ───
【手続補正書】[Procedure amendment]
【提出日】平成６年６月２２日[Submission date] June 22, 1994
【手続補正１】[Procedure Amendment 1]
【補正対象書類名】明細書[Document name to be amended] Statement
【補正対象項目名】００１０[Correction target item name] 0010
【補正方法】変更[Correction method] Change
【補正内容】[Correction content]
【００１０】 従って、本発明の目的は、基本的に成形
の容易なポリオレフィン系の組成物からなる材料を使用
して、作動時には確実にカバーが破壊され、かつ破片が
飛散しないエアーバッグカバー材用オレフィン系熱可塑
性エラストマー組成物を提供することにある。また、本
発明の他の目的は、外観性、風合い、制振性、触感（柔
軟性）などの表面特性に優れ、寒冷地から熱帯地までの
広い範囲の温度条件下で使用可能な耐候性を有し、低温
物性、特に低温での破断伸度に優れたエアーバッグカバ
ー材用オレフィン系熱可塑性エラストマー組成物を提供
することにある。さらに、本発明の他の目的は、成形性
に優れ、エアーバッグカバー材を効率よく生産でき、使
用後にリサイクルが可能なオレフィン系熱可塑性エラス
トマー組成物を提供することにある。It is therefore an object of the present invention uses a material comprising a set formed of easy polyolefin essentially shaped reliably cover is destroyed during operation, and air bag cover material debris is not scattered An object is to provide an olefin-based thermoplastic elastomer composition for use. Further, another object of the present invention is excellent in surface properties such as appearance, texture, vibration damping and touch (flexibility), and weather resistance that can be used in a wide range of temperature conditions from cold regions to tropical regions. It is to provide an olefin-based thermoplastic elastomer composition for an air bag cover material, which has the above-mentioned properties and is excellent in low-temperature physical properties, particularly, elongation at break at low temperature. Further, another object of the present invention is to provide an olefin-based thermoplastic elastomer composition having excellent moldability, capable of efficiently producing an air bag cover material, and recyclable after use.
【手続補正２】[Procedure Amendment 2]
【補正対象書類名】明細書[Document name to be amended] Statement
【補正対象項目名】００４１[Correction target item name] 0041
【補正方法】変更[Correction method] Change
【補正内容】[Correction content]
【００４１】[0041]
【表１】 [Table 1]
【手続補正３】[Procedure 3]
【補正対象書類名】明細書[Document name to be amended] Statement
【補正対象項目名】００４２[Correction target item name] 0042
【補正方法】変更[Correction method] Change
【補正内容】[Correction content]
【００４２】 表１に示した各物性の測定および評価方
法は以下のとおりである。 （１）ＭＦＲ（ｇ／１０分）：２３０℃，２．１６ｋｇ
荷重で測定。 （２）ＪＩＳ Ａ硬度：ＪＩＳ Ｋ６３０１により測
定。 （３）破断強度（ＴＢ）（ｋｇ／ｃｍ２）：ＪＩＳ Ｋ
６３０１により測定。 （４）引裂強度（ＴＲ）（ｋｇ／ｃｍ）：ＡＳＴＭ Ｄ
６２４−５４により測定。 （５）アイゾット衝撃強度（ｋｇ・ｃｍ／ｃｍ２）：Ｊ
ＩＳ Ｋ６３０１（ノッチ付）により測定（−４０℃お
よび−５０℃）し、破壊の有無を観察した。 ＮＢ：破壊せず、 ×：破壊。 （６）破断伸度（％）：ＪＩＳ Ｋ６３０１により測定
（−４０℃および２３℃）。 （７）曲げ弾性率（ｋｇ／ｃｍ２）：ＪＩＳ Ｋ７２０
３により測定。The measurement and evaluation methods of each physical property shown in Table 1 are as follows. (1) MFR (g / 10 minutes): 230 ° C., 2.16 kg
Measured by load. (2) JIS A hardness: measured according to JIS K6301. (3) Breaking strength (TB) (kg / cm 2 ): JIS K
Measured by 6301. (4) Tear strength (TR) (kg / cm) : ASTM D
Measured according to 624-54. (5) Izod impact strength (kg · cm / cm 2 ): J
It was measured (-40 ° C and -50 ° C) by IS K6301 (notched), and the presence or absence of breakage was observed. NB: not destroyed, x: destroyed. (6) Elongation at break (%): Measured according to JIS K6301 (-40 ° C and 23 ° C). (7) Flexural modulus (kg / cm 2 ): JIS K720
Measured by 3.
Claims (4)
2.16kg荷重）２０〜２００ｇ／１０分のポリプロピレン
２０〜８０重量％と、（ｂ）ムーニー粘度（ＭＬ1+4 ，
１００℃）５０以上のエチレン系共重合体ゴム８０〜２
０重量％と、前記成分（ａ）と（ｂ）の合計１００重量
部に対して（ｃ）鉱油系軟化剤１〜２００重量部と
（ｄ）脂肪酸系滑剤0.2 〜2.0 重量部とを含有してなる
エアーバッグカバー材用オレフィン系熱可塑性エラスト
マー組成物。1. A melt flow rate (230 ° C.,
2.16 kg load) 20 to 200 g / 10 min polypropylene 20 to 80% by weight, and (b) Mooney viscosity (ML 1 + 4 ,
100 ° C) 50 or more ethylene-based copolymer rubber 80-2
0% by weight, and (c) 1 to 200 parts by weight of a mineral oil-based softening agent and (d) 0.2 to 2.0 parts by weight of a fatty acid-based lubricant per 100 parts by weight of the components (a) and (b) in total. An olefinic thermoplastic elastomer composition for an air bag cover material.
（ｃ）成分の鉱油系軟化剤を予め配合混練した油展組成
物に（ａ）成分のポリプロピレンと（ｄ）成分の脂肪酸
系滑剤とを混練して得られる請求項１に記載のエアーバ
ッグカバー材用オレフィン系熱可塑性エラストマー組成
物。2. An oil-extended composition prepared by previously mixing and kneading the ethylene-based copolymer rubber of the component (b) with the mineral oil-based softening agent of the component (c) and the polypropylene of the component (a) and the fatty acid-based component (d). The olefinic thermoplastic elastomer composition for an air bag cover material according to claim 1, which is obtained by kneading with a lubricant.
が、（ａ）２５〜７０重量％、（ｂ）７５〜３０重量％
であり、（ｃ）成分の配合量が成分（ａ）と（ｂ）の合
計１００重量部に対して１０〜１２０重量部である請求
項１または請求項２に記載のエアーバッグカバー材用オ
レフィン系熱可塑性エラストマー組成物。3. The mixing ratio of the component (a) and the component (b) is (a) 25 to 70% by weight, and (b) 75 to 30% by weight.
And the compounding amount of the component (c) is 10 to 120 parts by weight based on 100 parts by weight of the components (a) and (b) in total, and the olefin for an air bag cover material according to claim 1. -Based thermoplastic elastomer composition.
上、曲げ弾性率（JIS K7203 ）が５００〜２５００kg／
cm2 である請求項１乃至３のいずれかの項に記載のエア
ーバッグカバー材用オレフィン系熱可塑性エラストマー
組成物。4. JIS A hardness (JIS K6301) of 80 or more, flexural modulus (JIS K7203) of 500 to 2500 kg /
The olefinic thermoplastic elastomer composition for an air bag cover material according to any one of claims 1 to 3, which has a size of cm 2 .
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP6155341A JPH07330978A (en) | 1994-06-14 | 1994-06-14 | Thermoplastic olefin elastomer composition for air bag cover material |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP6155341A JPH07330978A (en) | 1994-06-14 | 1994-06-14 | Thermoplastic olefin elastomer composition for air bag cover material |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH07330978A true JPH07330978A (en) | 1995-12-19 |
Family
ID=15603778
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP6155341A Pending JPH07330978A (en) | 1994-06-14 | 1994-06-14 | Thermoplastic olefin elastomer composition for air bag cover material |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH07330978A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2009221484A (en) * | 1997-03-07 | 2009-10-01 | Dow Global Technologies Inc | Elastomer composition having improved abrasion resistance, friction coefficient, and hot green strength |
-
1994
- 1994-06-14 JP JP6155341A patent/JPH07330978A/en active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2009221484A (en) * | 1997-03-07 | 2009-10-01 | Dow Global Technologies Inc | Elastomer composition having improved abrasion resistance, friction coefficient, and hot green strength |
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