Three stage graft polymerization process for preparing nitrile b

Details Three stage graft polymerization process for preparing nitrile b Three stage graft polymerization process for preparing nitrile b

1981-09-16

1983-11-15

Briggs, Sr., Wilbert J.

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

Synthetic resins

Mixing of two or more solid polymers; mixing of solid...

525310, 525315, C08F27902, C08F27904

Patent

active

044157088

ABSTRACT:
A nitrile based resin produced by graft polymerizing in the presence of a rubber, a first group of monomers in a first polymerization step, then a second group of monomers in a second polymerization step, and then a third group of monomers in a third polymerization step; wherein the resin comprises (A) 5 to 25 parts by weight of the rubber and (B) 75 to 95 parts by weight of (I) 5 to 40 weight percent of the product of the first polymerization step comprising .lambda. weight percent unsaturated nitrile and 100-X weight percent vinyl compound having aromatic vinyl compound as an essential element; (II) 2 to 35 weight percent of the product of the second polymerization step comprising Y weight percent unsaturated nitrile and 100-Y weight percent vinyl compound having aromatic vinyl compound as an essential element; and (III) 25 to 93 weight percent of the product of the third polymerization step comprising Z weight percent unsaturated nitrile and 100-Z weight percent vinyl compound having aromatic vinyl compound as an essential element, wherein

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