Synthetic resins or natural rubbers -- part of the class 520 ser – Synthetic resins – Polymers from only ethylenic monomers or processes of...
Patent
1983-12-21
1988-06-28
Schofer, Joseph L.
Synthetic resins or natural rubbers -- part of the class 520 ser
Synthetic resins
Polymers from only ethylenic monomers or processes of...
C08F 1214
Patent
active
047540117
ABSTRACT:
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-isopropenyl- .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 aqueous 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.
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Journal of Applied Chem. U.S.S.R., vol. 45, No. 2, pp. 462-463, Feb. 1972.
Dexter Robin W.
Forgione Peter S.
Sedlak John A.
American Cyanamid Company
Benjamin Roger S.
Kulkosky Peter F.
Schofer Joseph L.
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