Chemistry of carbon compounds – Miscellaneous organic carbon compounds
Patent
1978-08-29
1980-07-15
Michl, Paul R.
Chemistry of carbon compounds
Miscellaneous organic carbon compounds
526317, C08L 3302
Patent
active
042127858
ABSTRACT:
In a process for the preparation of a viscosity raising copolymer, which comprises copolymerizing at an elevated temperature (a) methacrylic acid, (b) a conjugated diolefin, and (c) an ester of an .alpha.,.beta.-ethylenically unsaturated dicarboxylic acid, an improvement is provided wherein (a) 50-60% by weight of methacrylic acid, (b) 15-49% by weight of a conjugated diolefin, and (c) 1-25% by weight of fumaric acid dialkyl ester, maleic acid dialkyl ester or a mixture thereof, wherein each alkyl is of 1-8 carbon atoms, are copolymerized in an aqueous emulsion having a phase ratio of monomer mixture:water of 1:1.7 to 1:2.5, wherein, based on the monomer content, the aqueous phase contains 0.02-1% by weight of an alkaline compound, 0.05-1% by weight of an initiator, 0.01-1% by weight of a molecular weight regulator and 0.1-5% by weight of an emulsifier.
REFERENCES:
patent: 2952564 (1960-09-01), Traverso
patent: 2952565 (1960-09-01), Contois
patent: 3392048 (1968-07-01), Rolik
patent: 3657175 (1972-04-01), Zimmerman
patent: 3903035 (1975-09-01), Affeldt
patent: 3941912 (1976-03-01), Tajima
Chemische Werke Huls A.G.
Michl Paul R.
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