JPH0417201B2 - - Google Patents

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Publication number
JPH0417201B2
JPH0417201B2 JP59134176A JP13417684A JPH0417201B2 JP H0417201 B2 JPH0417201 B2 JP H0417201B2 JP 59134176 A JP59134176 A JP 59134176A JP 13417684 A JP13417684 A JP 13417684A JP H0417201 B2 JPH0417201 B2 JP H0417201B2
Authority
JP
Japan
Prior art keywords
vinyl chloride
polymerization
weight
parts
polymer
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
Application number
JP59134176A
Other languages
Japanese (ja)
Other versions
JPS6114204A (en
Inventor
Kenichi Ito
Genji Nokuki
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Shin Etsu Chemical Co Ltd
Original Assignee
Shin Etsu Chemical Co Ltd
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Shin Etsu Chemical Co Ltd filed Critical Shin Etsu Chemical Co Ltd
Priority to JP13417684A priority Critical patent/JPS6114204A/en
Priority to DE8585107874T priority patent/DE3574258D1/en
Priority to EP85107874A priority patent/EP0166430B1/en
Priority to US06/748,432 priority patent/US4694055A/en
Priority to CA000485257A priority patent/CA1250086A/en
Priority to NO852581A priority patent/NO164601C/en
Priority to ES544635A priority patent/ES8700278A1/en
Priority to ZA854867A priority patent/ZA854867B/en
Priority to CS854726A priority patent/CS268164B2/en
Priority to BR8503127A priority patent/BR8503127A/en
Priority to PL25424285A priority patent/PL254242A1/en
Priority to YU01084/85A priority patent/YU108485A/en
Priority to KR1019850004646A priority patent/KR890002929B1/en
Priority to HU852547A priority patent/HU202255B/en
Priority to MX205834A priority patent/MX164430B/en
Priority to PT80734A priority patent/PT80734B/en
Priority to RO119360A priority patent/RO92361B/en
Priority to DD27810185A priority patent/DD263066A5/en
Priority to NZ212604A priority patent/NZ212604A/en
Priority to CN85105505.2A priority patent/CN1005113B/en
Publication of JPS6114204A publication Critical patent/JPS6114204A/en
Priority to US07/129,665 priority patent/USRE32813E/en
Priority to HK711/90A priority patent/HK71190A/en
Publication of JPH0417201B2 publication Critical patent/JPH0417201B2/ja
Granted legal-status Critical Current

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  • Polymerisation Methods In General (AREA)
  • Addition Polymer Or Copolymer, Post-Treatments, Or Chemical Modifications (AREA)
  • Graft Or Block Polymers (AREA)

Description

【発明の詳細な説明】[Detailed description of the invention]

(産業上の利用分野) 本発明は塩化ビニル系重合体の改良された製造
方法に関し、特にかさ比重が高くフイツシユアイ
のきわめて少ない高品質の塩化ビニル系重合体を
得ることを目的とする。 (従来の技術) 従来、塩化ビニル系重合体は単量体を水媒体中
で油溶性重合開始剤を用いて懸濁重合することに
より大量生産されているが、一般にこの重合体に
は硬質成形品等を押出成形する場合の生産性(時
間当りの押出量の増大)の観点からかさ比重の高
い重合体であることが要請されている。 塩化ビニルを水媒体中で懸濁重合する場合、得
られる重合体のかさ比重は一般に分散剤の種類や
かくはん条件に大きく依存することがよく知られ
ているところであり、従来からこのかさ比重を高
くすることについて種々の提案がなされている。
しかし、かさ比重が高くなると重合体のポロシテ
イが低下し、フイツシユアイが増加するという問
題がある。 一方成形時のゲル化特性、可塑剤の吸収性とい
う観点からはポロシテイの高い重合体であること
が望まれており、重合系へ界面活性剤を添加する
などの方法によりこのポロシテイ向上が図られて
いるが、この場合にはかさ比重が低くなる。 このようにかさ比重を高くすることとポロシテ
イを向上させることとは相反する関係にあり、こ
れら両者の要請を同時に満足することはきわめて
困難である。最近この点を少しでも解決すべく、
分散剤としてカルボキシル基を含む水不溶性の架
橋ポリマーと非イオン界面活性剤とを使用する方
法が提案されている(公表特許公報57−500614
号、同57−500650号)が、かさ比重を高めるとい
う点である程度効果があるとしても、ポロシテイ
を向上させフイツシユアイのない重合体を得ると
いう点では効果が不充分であり、特にこのフイツ
シユアイの問題は高品質の成形品を得るうえで大
きな欠点であり解決されなければならない。 (発明の構成) 本発明者らは特にかさ比重が高くフイツシユア
イ(ガラス玉粒子)のない高品質の重合体を得る
べく鋭意研究した結果、本発明を完成した。 すなわち本発明は、油溶性重合開始剤および非
イオン系界面活性剤を含む水媒体中で塩化ビニル
もしくは塩化ビニルを主体とする単量体混合物の
重合を開始させ、重合転化率が1%から20%に達
する間の時点でこの重合系に架橋化されたカルボ
キシル基含有共重合体を添加することを特徴とす
る塩化ビニル系重合体の製造方法に関するもので
あり、この方法によればかさ比重が高くかつ可塑
剤吸収性にすぐれフイツシユアイのきわめて少な
い高品質の重合体が得られる。 以下本発明を詳細に説明する。 塩化ビニル系重合体に関しフイツシユアイの原
因となるガラス玉粒子は、重合初期の塩化ビニル
単量体に対して重合開始剤の不均一分散に起因し
生成する。単量体に対し重合開始剤を均一に分散
させるためには、重合開始剤を反応器に仕込んで
から昇温して重合を開始させるまでの間にかくは
んをよく行つて重合開始剤を分散させる方法、重
合開始剤をあらかじめ単量体に溶かてから仕込む
方法等が考えられる。しかし、前者のかくはんを
よく行う方法にあつては水媒体に加えられる分散
剤が高粘度のものであつたりすると重合開始剤の
均一分散が達成されず、また単量体にあらかじめ
溶解してから仕込む方法では、溶解槽、仕込み配
管中でスケールが発生する不利がある。さらに少
量の単量体中に溶解して仕込み、そのあと多量の
単量体の仕込みで洗う効果をもたせるようにして
も重合開始剤の均一混合は達成できない。 本発明はこうした諸事項にも検討を加え実験を
重ねた結果、前記したように、油溶性重合開始剤
および非イオン系界面活性剤を含む水媒体中で塩
化ビニル系単量体の重合を開始し、その重合転化
率が1%から20%に達する間の時点で架橋化され
たカルボキシル基含有共重合体(以下単に架橋共
重合体と呼ぶ)を添加し、重合反応を行わせる方
法を完成したもので、架橋共重合体を当初からあ
るいは重合転化率1%未満の時期に加えると、理
由は明らかではないがガラス玉粒子の生成が多く
なり結果として重合体はフイツシユアイの多い低
品質のものとなる。一方該架橋共重合体を重合転
化率が20%を越えた時点で加えると、フイツシユ
アイが多くなることはないが、重合中に生成重合
体粒子の合一が起こるため重合体の粒子は不均一
となりかさ比重の低いものとなる。 本発明に使用される架橋化されたカルボキシル
基含有共重合体は、かさ比重の高い重合体を得る
うえで重要とされる添加剤であり、このものを水
媒体中に存在させることにより単量体液滴に対し
非常にすぐれた分散剤的作用(安定化作用)を示
し、均一な粒子形からなる重合体を生成する利点
が与えられる。 この架橋共重合体は、1分子中に2個もしくは
それ以上の末端重合性CH2=C基を有する化合
物(架橋剤)と重合性不飽和カルボン酸化合物と
を架橋共重合させたものであればよく、該架橋剤
としてはジビニルベンゼン、ジビニルナフタレ
ン、可溶性の重合ジエンたとえばポリブタジエ
ン、エチレングリコールジアクリレート、エチレ
ングリコールジメタクリレート、アリルアクリレ
ート、メチレンビスアクリルアミド、ジビニルエ
ーテル、ジアリルエーテル、そのほかペンタエリ
スリトール、マニトール、ソルビトール、グルコ
ース、サツカロースなどのポリアリル、ポリビニ
ル等、さらには一般式 (式中のRは水素原子またはメチル基、l,
m,nは0<l+m+n≦500を満足する数を示
す、ただしRが水素原子を示しかつn=0の場合
に限りl+m=1を満足する数を除外する)で示
される架橋剤があげられ、この一般式()で示
される架橋剤としては、ジエチレングリコールビ
スアリルエーテル、ジエチレングリコールビスメ
タリルエーテル、 が例示される。 他方、重合性不飽和カルボン酸としては、アク
リル酸、メタクリル酸、イタコン酸、クロロアク
リル酸、シアノアクリル酸、α−フエニルアクリ
ル酸、α−ベンジルアクリル酸、クロトン酸、マ
レイン酸、フマル酸、ソルビン酸などがそれぞれ
例示される。なお、該架橋剤および重合性不飽和
カルボン酸はそれぞれ1種に限られず2種以上を
併用してもよい。 架橋剤と重合性不飽和カルボン酸との共重合比
は、重合性不飽和カルボン酸100重量部に対し前
記架橋剤を0.05〜10重量部好ましくは0.1〜5重
量部とすることがよく、この量が少なすぎると架
橋化の効果が得られず、多すぎると架橋化が過度
になつて共重合体は分散剤的効果を示さなくな
る。 架橋共重合の反応は、重合開始剤としてアゾ
系、過酸化物系、レドツクス系等の触媒たとえば
アゾビスイソブチロニトリル、2,2′−アゾビス
(2,4−ジメチル−4−メトキシバレロニトリ
ル)、ベンゾイルパーオキシド、クメンハイドロ
パーオキシド、第三級ブチルハイドロパーオキシ
ド、過硫酸塩、過硫酸塩と過炭酸塩の組み合せ、
過硫酸塩と亜硫酸塩との組み合せ等を使用し、ベ
ンゼン、トルエン、n−ヘキサン、酢酸エチルな
どの溶剤中で反応させることにより行われる。 つぎに、非イオン系界面活性剤としては、ポリ
オキシエチレンアルキルエーテル、ポリオキシエ
チレンアルキルフエニルエーテル、ポリオキシエ
チレンポリスチリルフエニルエーテル、ポリオキ
シエチレンポリオキシプロピレンブロツクコポリ
マー、グリセリン脂肪酸部分エステル、ソルビタ
ン脂肪酸部分エステル、ペンタエリスリトール脂
肪酸部分エステル、プロピレングリコールモノ脂
肪酸エステル、しよ糖脂肪酸部分エステル、ポリ
オキシエチレンソルビタン脂肪酸部分エステル、
ポリオキシエチレンソルビトール脂肪酸部分エス
テル、ポリオキシエチレングリセリン脂肪酸部分
エステル、ポリエチレングリコール脂肪酸エステ
ル、ポリグリセリン脂肪酸部分エステル、ポリオ
キシエチレン化ひまし油、脂肪酸ジエタノールア
ミド、N,N−ビス−2−ヒドロキシアルキルア
ミン、ポリオキシエチレンアルキルアミン、トリ
エタノールアミン脂肪酸エステル、トリアルキル
アミンオキシドなどが例示され、1種または2種
以上の混合物として使用される。 本発明においては水媒体中に非イオン系界面活
性剤が添加され、重合転化率が前記した一定の値
となつた時期に架橋共重合体が添加されるのであ
るが、その量は仕込まれる単量体100重量部当り、
非イオン系界面活性剤0.005〜1重量部(好まし
くは0.01〜0.5重量部)、架橋共重合体0.01〜2重
量部(好ましくは0.02〜0.5重量部)とすること
がよい。 本発明の方法を実施するにあたつて使用される
油溶性重合開始剤としては、ジイソプロピルパー
オキシジカーボネート、ジ−2−エチルヘキシル
パーオキシジカーボネート、アセチルシクロヘキ
シルスルホニルパーオキサイド、t−ブチルパー
オキシピバレート、ベンゾイルパーオキサイド、
ラウロイルパーオキサイドなどの有機過酸化物、
アゾビスイソブチロニトリル、アゾビス−2,4
−ジメチルバレロニトリル、アゾビス−2,4−
ジメトキシ−2,4−ジメチルバレロニトリルな
どのアゾ化合物等が例示される。 本発明の方法は、塩化ビニルまたは塩化ビニル
を主体とする単量体混合物の特に懸濁重合に好適
に応用されるが、共重合体の取得を目的とする場
合のコモノマーとしては、酢酸ビニルなどのビニ
ルエステル、ビニルエーテル、アクリル酸または
メタクリル酸およびそれらのエステル、マレイン
酸もしくはフマール酸またはそれらのエステル、
無水マレイン酸、芳香族ビニル化合物、アクリロ
ニトリルなどの不飽和ニトリル化合物、フツ化ビ
ニリデン、塩化ビニリデンなどのハロゲン化ビニ
リデン、エチレン、プロピレンなどのオレフイン
等が例示される。 なお、重合開始剤の添加量、重合温度、重合時
間等は従来塩化ビニルを水媒体中で重合する場合
に採用されている条件に準じて定めればよく、こ
れらは特に限定されるものではない。 本発明の方法によれば、前記した効果のほかに
重合器内壁、かくはん装置部表面におけるスケー
ル付着量が減少されるという利点が与えられる
が、この効果は重合系(水媒体)中に水溶性塩基
物質を、仕込み単量体に対し0.1重量%以下の量
で添加することによりさらに向上される。 つぎに具体的実施例をあげる。 実施例1〜2、比較例1〜2 内容積100のステンレス製重合器に、脱イオ
ン水60Kg、非イオン系界面活性剤としてポリ
(20)オキシエチレンソルビタンモノオレエート
30g、重合開始剤としてジ−2−エチルヘキシル
パーオキシジカーボネート20gを仕込み、重合器
内を脱気した後塩化ビニル単量体を30Kg仕込ん
だ。かくはん下に57℃に昇温して重合を開始し
た。 第1表に示す重合転化率に達した時点(2%ま
たは15%)で、下記の架橋共重合体の0.5重量%
水溶液6を重合系に添加し、重合反応を行わせ
た。 架橋共重合体:(1) アクリル酸100重量部とジエ
チレングリコールビスアリルエーテル1重
量部との架橋共重合体 このようにして重合反応を行わせ、重合器内圧
が6.0Kg/cm2Gとなつた時点で重合を停止し、未
反応単量体を回収し、重合体スラリーを取出し脱
水乾燥し重合体を取得した。 この重合体について、かさ比重、可塑剤吸収
性、およびフイツシユアイを測定したところ、第
1表に示すとおりの結果が得られた。 なお、同表には可記の比較例1および比較例2
の結果を併記した。 比較例 1 実施例1において、架橋共重合体の添加時期を
重合転化率0%のときとしたほかは同様に行つ
た。 比較例 2 実施例1において、架橋共重合体の添加時期を
重合転化率25%のときとしたほかは同様に行つ
た。 第1表に示されているように、実施例1および
実施例2においては、かさ比重が0.53g/ml以上
であり、可塑剤吸収量も多く、かつフイツシユア
イのきわめて少ない高品質の重合体が得られる。
これに対し比較例1ではかさ比重が高いけれども
可塑剤吸収性に劣るし、また比較例2ではかさ比
重が低く、いずれにおいても本発明の目的が達成
されない。
(Industrial Application Field) The present invention relates to an improved method for producing vinyl chloride polymers, and in particular, an object of the present invention is to obtain high quality vinyl chloride polymers that have a high bulk specific gravity and very little buildup. (Prior art) Conventionally, vinyl chloride polymers have been mass-produced by suspension polymerization of monomers in an aqueous medium using an oil-soluble polymerization initiator. From the viewpoint of productivity (increase in the amount of extrusion per hour) when extrusion molding products, etc., a polymer with a high bulk specific gravity is required. It is well known that when vinyl chloride is subjected to suspension polymerization in an aqueous medium, the bulk specific gravity of the resulting polymer is generally largely dependent on the type of dispersant and stirring conditions. Various proposals have been made for doing so.
However, when the bulk specific gravity becomes high, the porosity of the polymer decreases and there is a problem that the porosity of the polymer increases. On the other hand, from the viewpoint of gelation properties during molding and plasticizer absorption, a polymer with high porosity is desired, and this porosity can be improved by methods such as adding surfactants to the polymerization system. However, in this case, the bulk specific gravity becomes low. As described above, increasing the bulk specific gravity and improving the porosity are in a contradictory relationship, and it is extremely difficult to satisfy both of these requirements at the same time. Recently, in order to solve this problem,
A method using a water-insoluble crosslinked polymer containing a carboxyl group and a nonionic surfactant as a dispersant has been proposed (Publication Patent Publication No. 57-500614).
No. 57-500650) is effective to some extent in increasing the bulk specific gravity, but it is insufficiently effective in improving the porosity and obtaining polymers free of fibers, especially the problem with fibers. This is a major drawback in obtaining high-quality molded products and must be solved. (Structure of the Invention) The present inventors completed the present invention as a result of intensive research aimed at obtaining a high-quality polymer that has a particularly high bulk specific gravity and is free of fish eyes (glass bead particles). That is, the present invention initiates polymerization of vinyl chloride or a monomer mixture mainly composed of vinyl chloride in an aqueous medium containing an oil-soluble polymerization initiator and a nonionic surfactant, and achieves a polymerization conversion rate of 1% to 20%. The present invention relates to a method for producing a vinyl chloride polymer, characterized in that a crosslinked carboxyl group-containing copolymer is added to the polymerization system at a point during which the bulk specific gravity reaches %. A high-quality polymer with high plasticizer absorption and extremely low stickiness can be obtained. The present invention will be explained in detail below. Glass bead particles, which cause fish eyes in vinyl chloride polymers, are generated due to non-uniform dispersion of the polymerization initiator in the vinyl chloride monomer at the initial stage of polymerization. In order to uniformly disperse the polymerization initiator into the monomers, the polymerization initiator must be thoroughly stirred after it is charged into the reactor and before the temperature is raised to start polymerization. Possible methods include a method in which the polymerization initiator is dissolved in the monomer in advance and then charged. However, in the former method of frequent stirring, if the dispersant added to the aqueous medium has a high viscosity, uniform dispersion of the polymerization initiator cannot be achieved, and if The charging method has the disadvantage that scale is generated in the dissolution tank and the charging piping. Furthermore, uniform mixing of the polymerization initiator cannot be achieved even if the polymerization initiator is dissolved and charged in a small amount of monomer and then a large amount of monomer is added to provide a washing effect. As a result of considering these matters and conducting repeated experiments, the present invention has been developed to initiate polymerization of vinyl chloride monomers in an aqueous medium containing an oil-soluble polymerization initiator and a nonionic surfactant, as described above. Then, when the polymerization conversion rate reached 1% to 20%, a method was completed in which a crosslinked carboxyl group-containing copolymer (hereinafter simply referred to as a crosslinked copolymer) was added to carry out a polymerization reaction. However, if a cross-linked copolymer is added from the beginning or when the polymerization conversion rate is less than 1%, glass bead particles will be produced in large numbers for reasons that are not clear, resulting in a low-quality polymer with a lot of stickiness. becomes. On the other hand, if the crosslinked copolymer is added when the polymerization conversion rate exceeds 20%, the amount of fisheye will not increase, but the resulting polymer particles will coalesce during polymerization, resulting in non-uniform polymer particles. It has a low bulk specific gravity. The crosslinked carboxyl group-containing copolymer used in the present invention is an important additive for obtaining a polymer with a high bulk specific gravity, and by making it exist in an aqueous medium, the monomer content can be reduced. It has the advantage of exhibiting very good dispersant action (stabilizing action) on body fluid droplets and producing polymers with uniform particle shape. This crosslinked copolymer is a product obtained by crosslinking a compound (crosslinking agent) having two or more terminal polymerizable CH 2 =C groups in one molecule and a polymerizable unsaturated carboxylic acid compound. Preferably, the crosslinking agent includes divinylbenzene, divinylnaphthalene, soluble polymerized dienes such as polybutadiene, ethylene glycol diacrylate, ethylene glycol dimethacrylate, allyl acrylate, methylene bisacrylamide, divinyl ether, diallyl ether, pentaerythritol, mannitol, etc. Polyallyl, polyvinyl, etc. such as sorbitol, glucose, and sutucarose, as well as general formulas (R in the formula is a hydrogen atom or a methyl group, l,
m and n represent numbers satisfying 0<l+m+n≦500; however, only when R represents a hydrogen atom and n=0, numbers satisfying l+m=1 are excluded). , as the crosslinking agent represented by this general formula (), diethylene glycol bisallyl ether, diethylene glycol bismethallyl ether, is exemplified. On the other hand, examples of polymerizable unsaturated carboxylic acids include acrylic acid, methacrylic acid, itaconic acid, chloroacrylic acid, cyanoacrylic acid, α-phenylacrylic acid, α-benzylacrylic acid, crotonic acid, maleic acid, fumaric acid, Examples include sorbic acid. Note that the crosslinking agent and the polymerizable unsaturated carboxylic acid are not limited to one type each, and two or more types may be used in combination. The copolymerization ratio of the crosslinking agent and the polymerizable unsaturated carboxylic acid is preferably 0.05 to 10 parts by weight, preferably 0.1 to 5 parts by weight, per 100 parts by weight of the polymerizable unsaturated carboxylic acid. If the amount is too small, the crosslinking effect will not be obtained, and if the amount is too large, the crosslinking will be excessive and the copolymer will no longer exhibit the effect of a dispersant. The crosslinking copolymerization reaction is carried out using an azo-based, peroxide-based, redox-based catalyst, etc. as a polymerization initiator, such as azobisisobutyronitrile, 2,2'-azobis(2,4-dimethyl-4-methoxyvaleronitrile). ), benzoyl peroxide, cumene hydroperoxide, tertiary butyl hydroperoxide, persulfates, combinations of persulfates and percarbonates,
This is carried out by using a combination of persulfate and sulfite and reacting in a solvent such as benzene, toluene, n-hexane, or ethyl acetate. Next, examples of nonionic surfactants include polyoxyethylene alkyl ether, polyoxyethylene alkyl phenyl ether, polyoxyethylene polystyrylphenyl ether, polyoxyethylene polyoxypropylene block copolymer, glycerin fatty acid partial ester, and sorbitan. Fatty acid partial ester, pentaerythritol fatty acid partial ester, propylene glycol monofatty acid ester, sucrose fatty acid partial ester, polyoxyethylene sorbitan fatty acid partial ester,
Polyoxyethylene sorbitol fatty acid partial ester, polyoxyethylene glycerin fatty acid partial ester, polyethylene glycol fatty acid ester, polyglycerin fatty acid partial ester, polyoxyethylated castor oil, fatty acid diethanolamide, N,N-bis-2-hydroxyalkylamine, poly Examples include oxyethylene alkylamine, triethanolamine fatty acid ester, and trialkylamine oxide, which may be used alone or as a mixture of two or more. In the present invention, a nonionic surfactant is added to the aqueous medium, and the crosslinked copolymer is added when the polymerization conversion rate reaches the above-mentioned constant value. Per 100 parts by weight,
It is preferable to use 0.005 to 1 part by weight (preferably 0.01 to 0.5 part by weight) of the nonionic surfactant and 0.01 to 2 parts by weight (preferably 0.02 to 0.5 part by weight) of the crosslinked copolymer. The oil-soluble polymerization initiators used in carrying out the method of the present invention include diisopropyl peroxydicarbonate, di-2-ethylhexyl peroxydicarbonate, acetylcyclohexylsulfonyl peroxide, and t-butyl peroxydicarbonate. barreto, benzoyl peroxide,
organic peroxides such as lauroyl peroxide,
Azobisisobutyronitrile, azobis-2,4
-dimethylvaleronitrile, azobis-2,4-
Examples include azo compounds such as dimethoxy-2,4-dimethylvaleronitrile. The method of the present invention is particularly suitably applied to suspension polymerization of vinyl chloride or a monomer mixture mainly composed of vinyl chloride, but when the purpose is to obtain a copolymer, comonomers such as vinyl acetate etc. vinyl esters, vinyl ethers, acrylic acid or methacrylic acid and their esters, maleic acid or fumaric acid or their esters,
Examples include maleic anhydride, aromatic vinyl compounds, unsaturated nitrile compounds such as acrylonitrile, vinylidene halides such as vinylidene fluoride and vinylidene chloride, and olefins such as ethylene and propylene. Note that the amount of polymerization initiator added, polymerization temperature, polymerization time, etc. may be determined according to the conditions conventionally adopted when vinyl chloride is polymerized in an aqueous medium, and these are not particularly limited. . According to the method of the present invention, in addition to the above-mentioned effects, the amount of scale adhesion on the inner wall of the polymerization vessel and the surface of the stirring device section is reduced. Further improvement can be achieved by adding a basic substance in an amount of 0.1% by weight or less based on the monomers charged. Next, a specific example will be given. Examples 1-2, Comparative Examples 1-2 In a stainless steel polymerization vessel with an internal volume of 100, 60 kg of deionized water and poly(20) oxyethylene sorbitan monooleate as a nonionic surfactant were added.
30 g of di-2-ethylhexyl peroxydicarbonate as a polymerization initiator were charged, and after the inside of the polymerization vessel was degassed, 30 kg of vinyl chloride monomer was charged. Polymerization was initiated by raising the temperature to 57°C while stirring. When the polymerization conversion rate shown in Table 1 is reached (2% or 15%), 0.5% by weight of the following crosslinked copolymer
Aqueous solution 6 was added to the polymerization system to carry out a polymerization reaction. Crosslinked copolymer: (1) Crosslinked copolymer of 100 parts by weight of acrylic acid and 1 part by weight of diethylene glycol bisallyl ether The polymerization reaction was carried out in this manner, and the internal pressure of the polymerization vessel became 6.0 Kg/cm 2 G. At this point, the polymerization was stopped, unreacted monomers were collected, and the polymer slurry was taken out and dehydrated and dried to obtain a polymer. When this polymer was measured for bulk specific gravity, plasticizer absorption, and firm eye, the results shown in Table 1 were obtained. In addition, Comparative Example 1 and Comparative Example 2 are listed in the same table.
The results are also listed. Comparative Example 1 The same procedure as in Example 1 was carried out except that the crosslinked copolymer was added at a time when the polymerization conversion rate was 0%. Comparative Example 2 The same procedure as in Example 1 was carried out except that the crosslinked copolymer was added at a polymerization conversion rate of 25%. As shown in Table 1, in Examples 1 and 2, high-quality polymers with a bulk specific gravity of 0.53 g/ml or more, a large amount of plasticizer absorption, and extremely low buildup were obtained. can get.
On the other hand, although Comparative Example 1 has a high bulk specific gravity, it is inferior in plasticizer absorption, and Comparative Example 2 has a low bulk specific gravity, and the object of the present invention cannot be achieved in either case.

【表】 実施例 3〜5 実施例1において、重合系に添加する架橋共重
合体の種類を下記の物質に変更した他は同様にし
て行なつた。結果は第2表に示すとおりであつ
た。 架橋共重合体の種類: (2) アクリル酸100重量部とジエチレングリコー
ルビスメタリルエーテル2重量部との共重合体 (3) アクリル酸100重量部とジエチレングリコー
ルビスアリルエーテル2重量部との共重合体 (4) アクリル酸100重量部とジエチレングリコー
ルビスアリルエーテル3重量部との共重合体
[Table] Examples 3 to 5 The same procedure as in Example 1 was carried out except that the type of crosslinked copolymer added to the polymerization system was changed to the following substance. The results were as shown in Table 2. Types of crosslinked copolymers: (2) Copolymer of 100 parts by weight of acrylic acid and 2 parts by weight of diethylene glycol bismethallyl ether (3) Copolymer of 100 parts by weight of acrylic acid and 2 parts by weight of diethylene glycol bisallyl ether ( 4) Copolymer of 100 parts by weight of acrylic acid and 3 parts by weight of diethylene glycol bisallyl ether

【表】 実施例 6〜7 実施例1において、重合系に添加する架橋共重
合体の種類を下記の物質に変更した他は同様にし
て行なつた。結果は第3表に示すとおりであつ
た。 架橋共重合体の種類: (5) アクリル酸100重量部とアリルペンタエリス
リトール0.3重量部との共重合体 (6) アクリル酸100重量部とアリルサツカロース
のモノマー1.3重量部との共重合体 比較例 3 内容積100のステンレス製重合器に脱イオン
水60Kg、非イオン系界面活性剤としてツイーン80
を30Kg、実施例6の架橋共重合体(5)30gを仕込
み、重合器内を脱気し攪拌した。次いでジ−2−
エチルヘキシルパーオキシジカーボネート20gを
溶解した塩化ビニル単量体30Kgを仕込んだ。57℃
に昇温して重合を行なつた。重合器内圧が6.0
Kg/cm2Gとなつた時点で重合を停止し未反応モノ
マーを回収し重合体スラリーを取出し脱水乾燥し
重合体を得た。 塩化ビニルモノマーと重合開始剤を仕込んだ配
管ノズルの下に塊状の重合体スケールができてお
り同配管内部もスケールが詰つていた。
[Table] Examples 6 to 7 The same procedure as in Example 1 was carried out except that the type of crosslinked copolymer added to the polymerization system was changed to the following substance. The results were as shown in Table 3. Types of crosslinked copolymers: (5) Copolymer of 100 parts by weight of acrylic acid and 0.3 parts by weight of allylpentaerythritol (6) Comparison of copolymers of 100 parts by weight of acrylic acid and 1.3 parts by weight of allyl sutucarose monomer Example 3 60 kg of deionized water and Tween 80 as a nonionic surfactant in a stainless steel polymerization vessel with an internal volume of 100
and 30 g of the crosslinked copolymer (5) of Example 6 were charged, and the inside of the polymerization vessel was degassed and stirred. Then G-2-
30 kg of vinyl chloride monomer in which 20 g of ethylhexyl peroxydicarbonate was dissolved was charged. 57℃
Polymerization was carried out by raising the temperature to . Polymerization vessel internal pressure is 6.0
When the pressure reached Kg/cm 2 G, the polymerization was stopped, unreacted monomers were collected, and the polymer slurry was taken out and dehydrated and dried to obtain a polymer. A lump of polymer scale had formed under the piping nozzle containing the vinyl chloride monomer and polymerization initiator, and the inside of the piping was also clogged with scale.

【表】【table】

Claims (1)

【特許請求の範囲】 1 油溶性重合開始剤および非イオン系界面活性
剤を含む水媒体中で塩化ビニルもしくは塩化ビニ
ルを主体とする単量体混合物の重合を開始させ、
重合転化率が1%から20%に達する間の時点でこ
の重合系に架橋化されたカルボキシル基含有共重
合体を添加することを特徴とする塩化ビニル系重
合体の製造方法。 2 前記架橋化されたカルボキシル基含有共重合
体が、一般式 (式中のRは水素原子またはメチル基、l,
m,nは0<l+m+n≦500を満足する数を示
す、ただしRが水素原子を示しかつn=0の場合
に限りl+m=1を満足する数を除外する)で示
される架橋剤と、重合性不飽和カルボン酸化合物
とを共重合させて得たものである特許請求の範囲
第1項記載の塩化ビニル系重合体の製造方法。 3 前記架橋化されたカルボキシル基含有共重合
体が、アクリル酸100重量部とジエチレングリコ
ールビスアリルエーテル0.05〜10重量部とを架橋
共重合させてなるものである特許請求の範囲第1
項記載の塩化ビニル系重合体の製造方法。 4 前記架橋化されたカルボキシル基含有共重合
体が、アクリル酸100重量部とジエチレングリコ
ールビスメタリルエーテル0.05〜10重量部とを架
橋共重合させてなるものである特許請求の範囲第
1項記載の塩化ビニル系重合体の製造方法。
[Claims] 1. Initiating polymerization of vinyl chloride or a monomer mixture mainly composed of vinyl chloride in an aqueous medium containing an oil-soluble polymerization initiator and a nonionic surfactant,
1. A method for producing a vinyl chloride polymer, which comprises adding a crosslinked carboxyl group-containing copolymer to the polymerization system when the polymerization conversion reaches 1% to 20%. 2 The crosslinked carboxyl group-containing copolymer has the general formula (R in the formula is a hydrogen atom or a methyl group, l,
m, n represent numbers satisfying 0<l+m+n≦500, however, only when R represents a hydrogen atom and n=0, numbers satisfying l+m=1 are excluded), and a crosslinking agent represented by 2. The method for producing a vinyl chloride polymer according to claim 1, which is obtained by copolymerizing a vinyl chloride polymer with a sexually unsaturated carboxylic acid compound. 3. Claim 1, wherein the crosslinked carboxyl group-containing copolymer is obtained by crosslinking and copolymerizing 100 parts by weight of acrylic acid and 0.05 to 10 parts by weight of diethylene glycol bisallyl ether.
A method for producing a vinyl chloride polymer as described in Section 1. 4. The chloride according to claim 1, wherein the crosslinked carboxyl group-containing copolymer is obtained by crosslinking and copolymerizing 100 parts by weight of acrylic acid and 0.05 to 10 parts by weight of diethylene glycol bismethallyl ether. A method for producing a vinyl polymer.
JP13417684A 1984-06-29 1984-06-29 Production of vinyl chloride polymer Granted JPS6114204A (en)

Priority Applications (22)

Application Number Priority Date Filing Date Title
JP13417684A JPS6114204A (en) 1984-06-29 1984-06-29 Production of vinyl chloride polymer
DE8585107874T DE3574258D1 (en) 1984-06-29 1985-06-25 A method for the suspension polymerization of vinyl chloride monomer
EP85107874A EP0166430B1 (en) 1984-06-29 1985-06-25 A method for the suspension polymerization of vinyl chloride monomer
US06/748,432 US4694055A (en) 1984-06-29 1985-06-25 Method for the suspension polymerization of vinyl chloride monomer
CA000485257A CA1250086A (en) 1984-06-29 1985-06-26 Method for the suspension polymerization of vinyl chloride monomer
NO852581A NO164601C (en) 1984-06-29 1985-06-27 PROCEDURE FOR SUSPENSION POLYMERIZATION OF VINYL CHLORIDE MONOMER.
ES544635A ES8700278A1 (en) 1984-06-29 1985-06-27 A method for the suspension polymerization of vinyl chloride monomer.
ZA854867A ZA854867B (en) 1984-06-29 1985-06-27 A method for the suspension polymerization of vinyl chloride monomer
CS854726A CS268164B2 (en) 1984-06-29 1985-06-27 Suspension polymerization of vinylchloride
YU01084/85A YU108485A (en) 1984-06-29 1985-06-28 Process for suspensive polymerisation of vinylchloride monomer
PL25424285A PL254242A1 (en) 1984-06-29 1985-06-28 Vilyl chloride suspension polymerization method
BR8503127A BR8503127A (en) 1984-06-29 1985-06-28 PROCESS FOR POLYMERIZATION IN SUSPENSION OF VINYL CHLORIDE MONOMER OR A MONOMER MIXTURE MAINLY COMPOSED OF VINYL CHLORIDE
KR1019850004646A KR890002929B1 (en) 1984-06-29 1985-06-28 A method for the suspension polymerization of vinyl chloride monomer
HU852547A HU202255B (en) 1984-06-29 1985-06-28 Process for suspension-polymerizing vinyl-chloride
MX205834A MX164430B (en) 1984-06-29 1985-06-28 A METHOD FOR SUSPENSION POLYMERIZATION OF A VINYL CHLORIDE MONOMER
PT80734A PT80734B (en) 1984-06-29 1985-06-28 PROCESS FOR POLYMERIZATION IN SUSPENSION OF VINYL CHLORIDE MONOMER
RO119360A RO92361B (en) 1984-06-29 1985-06-29 Process for polymerization in suspension of polyvinyl chloride
DD27810185A DD263066A5 (en) 1984-06-29 1985-07-01 METHOD FOR POLYMERIZING VINYL CHLORIDE MONOMER
NZ212604A NZ212604A (en) 1984-06-29 1985-07-01 Suspension polymerisation of vinyl chloride monomer
CN85105505.2A CN1005113B (en) 1984-06-29 1985-07-18 Vinyl Chloride Monomer Suspension Polymerization Method
US07/129,665 USRE32813E (en) 1984-06-29 1987-12-07 Method for the suspension polymerization of vinyl chloride monomer
HK711/90A HK71190A (en) 1984-06-29 1990-09-13 A method for the suspension polymerization of vinyl chloride monomer

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP13417684A JPS6114204A (en) 1984-06-29 1984-06-29 Production of vinyl chloride polymer

Publications (2)

Publication Number Publication Date
JPS6114204A JPS6114204A (en) 1986-01-22
JPH0417201B2 true JPH0417201B2 (en) 1992-03-25

Family

ID=15122217

Family Applications (1)

Application Number Title Priority Date Filing Date
JP13417684A Granted JPS6114204A (en) 1984-06-29 1984-06-29 Production of vinyl chloride polymer

Country Status (4)

Country Link
JP (1) JPS6114204A (en)
CS (1) CS268164B2 (en)
DD (1) DD263066A5 (en)
ZA (1) ZA854867B (en)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS6191205A (en) * 1984-10-12 1986-05-09 Shin Etsu Chem Co Ltd Method for producing vinyl chloride polymer
JPH02305804A (en) * 1989-05-22 1990-12-19 Shin Etsu Chem Co Ltd Method for producing vinyl chloride polymer

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS59134177A (en) * 1983-01-21 1984-08-01 東急車輌製造株式会社 Flat rack container

Also Published As

Publication number Publication date
CS472685A2 (en) 1988-10-14
JPS6114204A (en) 1986-01-22
ZA854867B (en) 1986-02-26
CS268164B2 (en) 1990-03-14
DD263066A5 (en) 1988-12-21

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