Emulsion copolymers of meta- or para-isopropenyl-.alpha.,...

Details Emulsion copolymers of meta- or para-isopropenyl-.alpha.,... Emulsion copolymers of meta- or para-isopropenyl-.alpha.,...

C - Chemistry, Metallurgy

08

F

402/131, 402/182

C08F 212/14 (2006.01) C08F 6/22 (2006.01) C08G 18/72 (2006.01)

Patent

CA 1224593

EMULSION COPOLYMERS OF META- OR PARA- -ISOPROPENYL-.alpha.,.alpha.-DIMETHYLBENZYLISOCYANATE Abstract of the Disclosure A method of making a copolymer of meta- or para- isopropenyl-.alpha.,.alpha.-dimethylbenzylisocyanate and at least one other ethylenically unsaturated comonomer polymerizable therewith, comprising polymerizing the meta- or para-iso- propenyl-.alpha.,.alpha.-dimethylbenzylisocyanate and at least one other ethylenically unsaturated comonomer in an aqueous emulsion in the presence of a free-radical polymerization initiator and a chain transfer agent to control molecular weight. Also disclosed are methods of breaking the aque- ous emulsion after polymerization is completed by either adding a salt, e.g., aluminum sulfate, or by freezing the emulsion followed by thawing to yield the copolymer as a mechanically separable solid phase of a two-phase liquid- solid mixture.

455400

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