Synthetic resins or natural rubbers -- part of the class 520 ser – Synthetic resins – Polymers from only ethylenic monomers or processes of...
Patent
1993-03-26
1994-06-07
Schofer, Joseph L.
Synthetic resins or natural rubbers -- part of the class 520 ser
Synthetic resins
Polymers from only ethylenic monomers or processes of...
526212, 5262181, 526227, 526330, 526264, C08F 200, C08F 206, C08F 434, C08F 404, C08F22610, C08F21808
Patent
active
053190416
ABSTRACT:
This invention relates to an improved process for producing a clear solution of vinylpyrrolidone (VP) and vinyl acetate (VA) monomers which comprises, in an anhydrous system,
(a) reacting a C.sub.2 to C.sub.3 alcoholic solution containing said VA monomer and between about 60 and about 80 wt. % portion of total VP monomer in the presence of between about 0.05 and about 0.3 wt. % of a free radical initiator selected from the group consisting of tertamylperoxy pivalate and 2,2-azobis(2-methylbutyronitrile) or a mixture thereof for a period of from about 5 to about 10 hours, at a temperature between about 60.degree. and about 110.degree. C.;
(b) gradually adding the remaining VP monomer in C.sub.2 to C.sub.3 alcohol solution at reaction temperature after the addition of the VA monomer is complete;
(c) raising the temperature of the resulting reaction mixture to between about 110.degree. and about 150.degree. C.;
(d) continuing the polymerization reaction at said higher temperature in the presence of from about 0.11 to about 0.6 wt. %, based on total monomers, of 2,5-dimethyl-2,5-bis(tert-butylperoxy) hexane and
(e) cooling the resulting reaction mixture and recovering a homogeneous VP/VA copolymer C.sub.2 to C.sub.3 alcohol solution containing less than 100 ppm of residual vinylpyrrolidone monomer or vinyl acetate residual monomer.
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patent: 5130388 (1992-07-01), Shih
Parikh Hemant
Smith Terry E.
Taylor Paul D.
Zhong Yuanzhen
Cheng Wu C.
ISP Investments Inc.
Maue Marilyn J.
Schofer Joseph L.
Ward Joshua J.
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