Synthetic resins or natural rubbers -- part of the class 520 ser – Synthetic resins – Mixing of two or more solid polymers; mixing of solid...
Reexamination Certificate
2011-04-19
2011-04-19
Jagannathan, Vasu (Department: 1764)
Synthetic resins or natural rubbers -- part of the class 520 ser
Synthetic resins
Mixing of two or more solid polymers; mixing of solid...
C139S42000D, C442S327000, C524S803000, C525S056000, C525S060000, C525S061000, C525S062000, C525S329500, C525S330300, C525S384000, C526S319000, C526S321000, C526S322000, C526S324000, C526S325000, C526S328000, C526S328500, C526S329000, C526S329500, C526S330000, C526S331000, C528S272000, C528S302000, C528S303000
Reexamination Certificate
active
07928166
ABSTRACT:
There is disclosed a polyvinyl alcohol having a 1,2-glycol bond in a side chain, and a process for preparing the polyvinyl alcolnol wherein there is no generation of dimethyl carbonate hence no need of a process of eliminating dimethyl carbonate in the recovering process of waste liquid after hydrolysis. Also, even when an introduction amount of 1,2-glycol bonds is increased, there is no deterioration of solubility in a hydrolyzing solution (methanol) of a copolymer (paste) before hydrolysis. Further, water-insolubility is not lowered even in experiencing thermal history. Specifically, there is provided a polyvinyl alcohol having a 1,2-glycol bond in a side chain obtained by hydrolyzing a copolymer of a vinyl ester monomer and a compound shown in the formula (1) wherein the hydrolysis degree of the polyvinyl alcohol is at least 60% by mol.
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Antonelli, Terry Stout & Kraus, LLP.
Huhn Richard A
Jagannathan Vasu
The Nippon Synthetic Chemical Industry Co., Ltd.
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