JPH068376B2 - Ethylene / propylene copolymer resin composition - Google Patents
Ethylene / propylene copolymer resin compositionInfo
- Publication number
- JPH068376B2 JPH068376B2 JP59067427A JP6742784A JPH068376B2 JP H068376 B2 JPH068376 B2 JP H068376B2 JP 59067427 A JP59067427 A JP 59067427A JP 6742784 A JP6742784 A JP 6742784A JP H068376 B2 JPH068376 B2 JP H068376B2
- Authority
- JP
- Japan
- Prior art keywords
- weight
- propylene copolymer
- ethylene
- resin composition
- 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.)
- Expired - Lifetime
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- Compositions Of Macromolecular Compounds (AREA)
Description
【発明の詳細な説明】 本発明は、加工性および低温耐衝撃性に優れた変性エチ
レン・プロピレン共重合体樹脂組成物に関する。The present invention relates to a modified ethylene / propylene copolymer resin composition having excellent processability and low temperature impact resistance.
結晶性ポリプロピレンは、低温に於ける耐衝撃性改善の
ために、一般にはエチレンとの共重合を行ない、結晶性
エチレン・プロピレン共重合体とする方法がとられてい
る。しかしながら、この方法による場合は、低温に於け
る耐衝撃性を良くするためには、かなりの高分子量であ
ることが必要であり、加工性の点で問題が生じる。In order to improve impact resistance at low temperature, crystalline polypropylene is generally copolymerized with ethylene to obtain a crystalline ethylene / propylene copolymer. However, according to this method, in order to improve the impact resistance at low temperature, it is necessary that the polymer has a considerably high molecular weight, which causes a problem in workability.
また、特殊な重合法により、低温に於いても耐衝撃性を
有する比較的分子量が小さく且つ加工性の改善された結
晶性エチレン・プロピレン共重合体を製造する方法もあ
るが、このようにして製造する場合は製造コストが高く
なり良い方法とはいえない。There is also a method for producing a crystalline ethylene / propylene copolymer having impact resistance even at low temperature, a relatively small molecular weight, and improved processability by a special polymerization method. In the case of manufacturing, the manufacturing cost is high and it cannot be said to be a good method.
また、結晶性エチレン・プロピレン共重合体を有機過酸
化物等と共に加熱処理を行なう方法も一般によく知られ
ているが、この方法による場合は物性の低下、特に引張
試験に於ける伸び率および低温時での耐衝撃性の低下に
大きな問題があった。Further, a method of heat-treating a crystalline ethylene / propylene copolymer together with an organic peroxide is generally well known. However, when this method is used, the physical properties are deteriorated, especially the elongation and low temperature in a tensile test. There was a big problem in the reduction of impact resistance with time.
そこで、本発明者らは鋭意研究の結果、上記の如き欠点
を克服し、特に低温に於いても耐衝撃性を損なうことな
く、伸び率および加工性の良好な変性エチレン・プロピ
レン共重合体樹脂組成物を得ることに成功し、本発明に
至った。Therefore, as a result of intensive research, the present inventors have overcome the above-mentioned drawbacks, and in particular, a modified ethylene / propylene copolymer resin having good elongation and processability without impairing impact resistance even at low temperatures. Succeeding in obtaining a composition, the present invention has been achieved.
すなわち、本発明は、MIが４〜２５である結晶性エチレ
ン・プロピレン共重合体１００重量部に、分子量が5000
〜60000であるポリジメチルシロキサン0.2〜５重量部お
よび有機過酸化物を混合し、加熱処理を行なって得られ
るエチレン・プロピレン共重合体樹脂組成物であって、
そのMIが３０以上であることを特徴とする結晶性エチレ
ンプロピレン共重合体樹脂組成物である。That is, in the present invention, 100 parts by weight of a crystalline ethylene / propylene copolymer having an MI of 4 to 25 has a molecular weight of 5,000.
An ethylene / propylene copolymer resin composition obtained by mixing 0.2 to 5 parts by weight of polydimethylsiloxane having an amount of ˜60,000 and an organic peroxide and performing heat treatment,
The MI is 30 or more, which is a crystalline ethylene-propylene copolymer resin composition.
本発明において使用される結晶性エチレン・プロピレン
共重合体は、エチレン含有量が５〜１５重量％であるこ
とが好ましく、エチレン含有量が５重量％未満では該共
重合体の低温における耐衝撃性に問題を生ずる傾向にあ
り、また、１５重量％を超えると前記共重合体の剛性が
低くなり共に実用的でない。The crystalline ethylene / propylene copolymer used in the present invention preferably has an ethylene content of 5 to 15% by weight, and when the ethylene content is less than 5% by weight, impact resistance of the copolymer at low temperature is low. However, if it exceeds 15% by weight, the rigidity of the copolymer becomes low, which is not practical.
又、結晶性エチレン・プロピレン共重合体は、MIが４〜
２５のものである。そのMIが４以下では変性後の製品に
フローマーク等を生じるため外観が低下し、また２５以
上では変性前の結晶性エチレン・プロピレン共重合体の
耐衝撃性が低いので、変性後の製品の耐衝撃性が劣るた
め共に好ましくない。The crystalline ethylene / propylene copolymer has an MI of 4 to
25. When the MI is 4 or less, the appearance of the modified product is deteriorated due to flow marks and the like, and when it is 25 or more, the impact resistance of the crystalline ethylene-propylene copolymer before modification is low, and therefore the product after modification is Both are not preferable because they have poor impact resistance.
本発明に用いられる有機過酸化物としては、例えば、ｔ
−ブチルパーオキシピパレート、ラウロイルパ−オキサ
イド、ベンゾイルパ−オキサイド、シクロヘキサノンパ
−オキサイド、ｔ−ブチルパ−オキシイソプロピルカー
ボネート、ｔ−ブチルパ−オキシベンゾエート、メチル
エチルケトンパ−オキサイド、ジクミルパ−オキサイ
ド、2,5−ジメチル−2,5−ジ（ｔ−ブチルパ−オキシ）
ヘキサン、ジ−ｔ−ブチルパ−オキサイド、2,5−ジメ
チル−2,5−ジ（ｔ−ブチルパ−オキシ）ヘキシン−３
などが挙げられる。これらは単独、または２種以上混合
して使用することができる。Examples of the organic peroxide used in the present invention include t
-Butylperoxypiparate, lauroylperoxide, benzoylperoxide, cyclohexanoneperoxide, t-butylperoxypropyl carbonate, t-butylperoxybenzoate, methyl ethyl ketone peroxide, dicumylperoxide, 2,5-dimethyl- 2,5-di (t-butylperoxy)
Hexane, di-t-butylperoxide, 2,5-dimethyl-2,5-di (t-butylperoxy) hexyne-3
And so on. These may be used alone or in combination of two or more.
これらの有機過酸化物の添加量は、結晶性エチレン・プ
ロピレン共重合体のMIおよび変性後の目標のMIにより異
なるが、通常、結晶性エチレン・プロピレン共重合体１
００重量部に対し、0.001〜0.1重量部程度が適当であ
る。The amount of these organic peroxides added varies depending on the MI of the crystalline ethylene / propylene copolymer and the target MI after modification, but usually the crystalline ethylene / propylene copolymer 1
About 0.001 to 0.1 parts by weight is suitable for 100 parts by weight.
本発明において用いられるポリジメチルシロキサンは、
分子量が5000〜60000のものである。分子量が5000未満
では、分子量が小さいため耐衝撃性の改良効果が小さ
く、本発明の効果があまり見られない。又、分子量が60
00を超えるポリジメチルシロキサンは、粘度が非常に大
きいため取り扱いが困難で、結晶性エチレン・プロピレ
ン共重合体への均一分散性に問題を生じ共に実用的でな
い。The polydimethylsiloxane used in the present invention is
It has a molecular weight of 5,000 to 60,000. When the molecular weight is less than 5,000, the effect of improving the impact resistance is small because the molecular weight is small, and the effect of the present invention is not so remarkable. Also, the molecular weight is 60
Polydimethylsiloxanes exceeding 00 have a very high viscosity and are difficult to handle, causing problems in uniform dispersibility in a crystalline ethylene / propylene copolymer, and both are not practical.
又、添加量は結晶性エチレン・プロピレン共重合体１０
０重量部に対し0.2〜５重量部である。0.2重量部未満の
添加量では耐衝撃性の改善効果が小さく、又、５重量部
を超えて添加すると得られる製品の機械的特性、特に曲
げ弾性率が低下し製品の表面にポリジメチルシロキサン
が浮出し、外観を低下させるため好ましくない。Also, the amount of crystalline ethylene / propylene copolymer 10 added
It is 0.2 to 5 parts by weight with respect to 0 parts by weight. If the addition amount is less than 0.2 parts by weight, the impact resistance improving effect is small, and if the addition amount is more than 5 parts by weight, the mechanical properties of the product obtained, especially the flexural modulus is lowered, and polydimethylsiloxane is not formed on the surface of the product. It is not preferable because it causes protrusion and deteriorates the appearance.
本発明に使用される結晶性エチレン・プロピレン共重合
体に、通常用いられる酸化防止剤、熱安定剤、紫外線吸
収剤、紫外線安定剤、金属劣化防止剤、核剤、顔料など
を添加することは何らさしつかえない。To the crystalline ethylene / propylene copolymer used in the present invention, it is possible to add commonly used antioxidants, heat stabilizers, UV absorbers, UV stabilizers, metal deterioration inhibitors, nucleating agents, pigments, etc. It doesn't matter.
本発明において、各組成物質の混合は、当業界で一般に
用いられているヘンシェルミキサー等を用いて行なわ
れ、加熱処理の方法としては、バンバリーミキサー、熱
ロール等を用いて行なう方法もあるが、一般には単軸押
出機、又は２軸押出機を用いて溶融混練され、ペレット
化される際に行なわれることが多い。このような場合の
押出温度は、結晶性エチレン・プロピレン共重合体の種
類および有機過酸化物の種類並びに添加量などにより左
右されるが、通常１５０〜２８０℃で行なわれる。In the present invention, the mixing of each composition substance is carried out using a Henschel mixer or the like generally used in the art, and as the heat treatment method, there is also a method using a Banbury mixer, a hot roll or the like. Generally, it is often carried out when melt-kneading and pelletizing using a single-screw extruder or a twin-screw extruder. The extrusion temperature in such a case depends on the type of the crystalline ethylene / propylene copolymer, the type of the organic peroxide, and the addition amount, but is usually 150 to 280 ° C.
本発明の方法により得られるエチレン・プロピレン共重
合体樹脂組成物は、MIを３０以上とすることが必要であ
り、３０以下では現在の市場より強く要求されている高
成形流動性が得られないので好ましくない。The ethylene / propylene copolymer resin composition obtained by the method of the present invention needs to have MI of 30 or more, and if it is 30 or less, the high molding fluidity which is strongly required in the current market cannot be obtained. It is not preferable.
このような方法により得られる樹脂組成物は、通常用い
られる射出成形法、押出成形法、および圧縮成形法等の
成形法により所定の成形品に成形し得る。The resin composition obtained by such a method can be molded into a predetermined molded article by a commonly used molding method such as an injection molding method, an extrusion molding method, and a compression molding method.
本発明の方法により得られる変性エチレン・プロピレン
共重合体樹脂組成物は、耐衝撃性、伸び率および加工性
において優れた物性を示す。The modified ethylene / propylene copolymer resin composition obtained by the method of the present invention exhibits excellent physical properties in impact resistance, elongation and processability.
以下、実施例により本発明を更に具体的に述べる。Hereinafter, the present invention will be described more specifically with reference to Examples.
MIはASTM.D-1238、曲げ弾性率はASTM.D-790、伸び率はA
STM.D-638、アイゾット衝撃強度はASTM.D-256、デュポ
ン衝撃強度はJIS K-6718の記載に従って各々測定した。MI is ASTM.D-1238, flexural modulus is ASTM.D-790, elongation is A
STM.D-638, Izod impact strength was measured according to ASTM.D-256, and DuPont impact strength was measured according to JIS K-6718.
また、成形品の外観は目視により判定した。The appearance of the molded product was visually determined.
実施例１ エチレン含有量が６重量％でMIが8.2である結晶性エチ
レン・プロピレンブロック共重合体（以下PP-Aと記す）
１００重量部に分子量が約40000であるポリジメチルシ
ロキサン1.5重量部、2,5−ジメチル−2,5−ジ（ｔ−ブ
チルパ−オキシ）ヘキサン0.066重量部、2,6−ジ−ｔ−
ブチル−４−メチルフェノール0.05重量部、テトラキス
〔メチレン−３−（3,5−ジ−ｔ−ブチル−４−ヒドロ
キシフェニル）プロピオネート〕メタン0.1重量部、ス
テアリン酸カルシウム0.1重量部およびｐ−ｔ−ブチル
安息香酸アルミニウム塩0.07重量部を添加した後、ヘン
シェルミキサーで混合し、一軸押出機にて２１０℃でペ
レットを作成した。得られたペレットを射出成形機を用
いて所定の試験片に成形し、各物性を測定した。Example 1 A crystalline ethylene / propylene block copolymer having an ethylene content of 6% by weight and an MI of 8.2 (hereinafter referred to as PP-A)
1.5 parts by weight of polydimethylsiloxane having a molecular weight of about 40,000, 100 parts by weight, 0.065 parts by weight of 2,5-dimethyl-2,5-di (t-butylperoxy) hexane, 2,6-di-t-
Butyl-4-methylphenol 0.05 part by weight, tetrakis [methylene-3- (3,5-di-t-butyl-4-hydroxyphenyl) propionate] methane 0.1 part by weight, calcium stearate 0.1 part by weight and p-t-butyl. After adding 0.07 part by weight of aluminum benzoate, the mixture was mixed with a Henschel mixer, and pellets were prepared at 210 ° C. with a single-screw extruder. The obtained pellet was molded into a predetermined test piece using an injection molding machine, and each physical property was measured.
これらの結果を表−１に示した。The results are shown in Table 1.
実施例２ 実施例１において、有機過酸化物の添加量を0.０９重量
部とした他は実施例１と同様に試験した。Example 2 A test was performed in the same manner as in Example 1 except that the amount of the organic peroxide added was 0.09 parts by weight.
得られた結果を表−１に示した。The obtained results are shown in Table 1.
実施例３ 実施例１において、PP-Aに代えてエチレン含有量が9.８
重量％でMIが２１であるエチレン・プロピレンブロック
共重合体（絵かpp-Bと記す）を用い、有機過酸化物の添
加量を0.０２６重量部とした他は実施例１と同様に試験
した。Example 3 In Example 1, ethylene content was 9.8 instead of PP-A.
An ethylene / propylene block copolymer (MI or pp-B) having an MI of 21 by weight% was used, and the addition amount of the organic peroxide was 0.026 parts by weight as in Example 1. Tested.
得られた結果を表−１に示した。The obtained results are shown in Table 1.
実施例４ 実施例３において、ポリジメチルシロキサンの添加量を
0.７５重量部とし、有機過酸化物の添加量を0.０３重量
部とした他は実施例３と同様に試験した。Example 4 In Example 3, the addition amount of polydimethylsiloxane was changed.
The test was performed in the same manner as in Example 3 except that the amount of the organic peroxide added was 0.75 parts by weight and the amount of the organic peroxide added was 0.03 parts by weight.
得られた結果を表−１に示した。The obtained results are shown in Table 1.
実施例５ 実施例１において、ポリジメチルシロキサンを分子量10
000のものにした他は実施例１と同様に試験した。Example 5 In Example 1, polydimethylsiloxane was added with a molecular weight of 10
The same test as in Example 1 was carried out except that 000 was used.
得られた結果を表−１に示した。The obtained results are shown in Table 1.
比較例１〜３ 実施例１において、ポリジメチルシロキサンの添加量を
各々０、0.１、７重量部とした他は実施例１と同様に試
験した。Comparative Examples 1 to 3 Tests were performed in the same manner as in Example 1 except that polydimethylsiloxane was added in amounts of 0, 0.1 and 7 parts by weight.
得られた結果を表−１に示した。The obtained results are shown in Table 1.
比較例４ 実施例１において、有機過酸化物を用いなかった他は実
施例１と同様に試験した。Comparative Example 4 A test was performed in the same manner as in Example 1 except that the organic peroxide was not used.
得られた結果を表−１に示した。The obtained results are shown in Table 1.
比較例５ 実施例１において、pp-Aに代えてエチレン含有量１３重
量％、MIが0.８の結晶性エチレン・プロピレンブロック
共重合体（以下pp-Cと記す）を用い、有機過酸化物の添
加量を0.２６重量部とした他は、実施例１と同様に試験
した。Comparative Example 5 In Example 1, a crystalline ethylene / propylene block copolymer (hereinafter referred to as pp-C) having an ethylene content of 13% by weight and an MI of 0.8 was used in place of pp-A, and organic peroxide was used. The same test as in Example 1 was conducted except that the addition amount of the product was 0.26 parts by weight.
得られた結果を表−１に示した。The obtained results are shown in Table 1.
比較例６ 実施例１において、ポリジメチルシロキサンを分子量10
00のものにした他は実施例１と同様に試験した。Comparative Example 6 In Example 1, polydimethylsiloxane was added with a molecular weight of 10
The test was performed in the same manner as in Example 1 except that the value of 00 was used.
得られた結果を表−１に示した。The obtained results are shown in Table 1.
───────────────────────────────────────────────────── フロントページの続き (56)参考文献 特開 昭55−110143（ＪＰ，Ａ) 特開 昭54−21449（ＪＰ，Ａ) ─────────────────────────────────────────────────── ─── Continuation of front page (56) References JP-A-55-110143 (JP, A) JP-A-54-21449 (JP, A)
Claims (1)
クス（ＭＩ）が４〜２５である結晶性エチレン・プロピ
レン共重合体１００重量部に分子量5000〜60000である
ポリジメチルシロキサン0.2〜５重量部および有機過酸
化物を混合し、加熱処理を行なって得られるエチレン・
プロピレン共重合体樹脂組成物であって、そのMIが３０
以上であることを特徴とするエチレン・プロピレン共重
合体樹脂組成物。1. 0.2 to 5 parts by weight of polydimethylsiloxane having a molecular weight of 5000 to 60,000 and 100 parts by weight of a crystalline ethylene / propylene copolymer having a melt flow index (MI) of 4 to 25 at 1.230 ° C. and an organic compound. Ethylene obtained by mixing peroxide and heat treatment
Propylene copolymer resin composition having an MI of 30
An ethylene / propylene copolymer resin composition characterized by the above.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP59067427A JPH068376B2 (en) | 1984-04-06 | 1984-04-06 | Ethylene / propylene copolymer resin composition |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP59067427A JPH068376B2 (en) | 1984-04-06 | 1984-04-06 | Ethylene / propylene copolymer resin composition |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS60212451A JPS60212451A (en) | 1985-10-24 |
| JPH068376B2 true JPH068376B2 (en) | 1994-02-02 |
Family
ID=13344601
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP59067427A Expired - Lifetime JPH068376B2 (en) | 1984-04-06 | 1984-04-06 | Ethylene / propylene copolymer resin composition |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH068376B2 (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2612748B2 (en) * | 1987-10-30 | 1997-05-21 | 日本合成ゴム株式会社 | Crosslinkable rubber composition and crosslinked rubber product |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE2821807A1 (en) * | 1977-07-18 | 1979-02-08 | Gen Electric | FLAME-RESISTANT COMPOUND BASED ON A HYDROCARBON POLYMER |
| DE2905356A1 (en) * | 1979-02-13 | 1980-08-21 | Bayer Ag | HOMOGENEOUS, THERMOPLASTIC MIXTURES OF PROPYLENE-ETHYLENE / COPOLYMERISATEN AND LIQUID, SATURATED DIORGANOPOLYSILOXANS OF A SPECIFIC VISCOSITY RANGE |
-
1984
- 1984-04-06 JP JP59067427A patent/JPH068376B2/en not_active Expired - Lifetime
Also Published As
| Publication number | Publication date |
|---|---|
| JPS60212451A (en) | 1985-10-24 |
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