Method for production of copolymer of vinyl cyanide compound and

Details Method for production of copolymer of vinyl cyanide compound and Method for production of copolymer of vinyl cyanide compound and

1986-06-27

1987-12-15

Schofer, Joseph L.

Synthetic resins or natural rubbers -- part of the class 520 ser

Synthetic resins

Polymers from only ethylenic monomers or processes of...

526 88, 526 80, 5262181, 5262191, 526342, 526347, C08F 218, C08F 404, C08F21210

Patent

active

047134291

ABSTRACT:
A method for producing by suspension polymerization a copolymer comprising a vinyl cyanide compound and an aromatic vinyl compound having excellent transparency, and uniform composition, and a content of the polymerized residue of vinyl cyanide compound in the range of from 50 to 85% by weight comprising the steps of: (a) carrying out initial charging of the total quantity of the vinyl cyanide compound and a partial quantity of the aromatic vinyl compound at a compositional ratio, wherein the content of the vinyl cyanide compound in the resulting copolymer attains an intended ratio within a range of from 50 to 85% by weight; (b) initiating the copolymerization reaction by adding a polymerization initiator having a decomposition half-life at 95.degree. C. of two hours or longer to the compounds charged in previous step after the reaction system is elevated to a temperature corresponding to a decomposition half-life T of the polymerization initiator and (c) carrying out the copolymerization reaction, elevating temperature of the reaction system along a temperature corresponding to the decomposition half-life of the polymerization initiator, while immediately and continuously feeding the remainder of the aromatic vinyl compound to the reaction system.

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