Free-radical polymerizations using mixed initiator systems...

Details Free-radical polymerizations using mixed initiator systems... Free-radical polymerizations using mixed initiator systems...

C - Chemistry, Metallurgy

08

F

402/296, 402/394

C08F 4/36 (2006.01) C08F 4/38 (2006.01) C08F 12/08 (2006.01)

Patent

CA 1072245

ABSTRACT A process for the free-radical polymerization of vinyl aromatic monomers in at least two thermally distinct polymerization stages each between the temperatures of about 70°C and 150°C in the presence of at least two free- radical initiators, one of which initiators is particularly effective at the lowest temperature stage and has the formula Image wherein R is an alkylene, alkynylene or alkenylene diradical, R1 is alkyl, alkenyl, alkynl or alkoxy and R2 is lower alkyl and R3 is hydrogen or a lower alkyl and a second of which initiators has a ten hour half-life temperature of at least about 80°C which temperature is at least about 15°C above the ten hour half-life temperature of the compound of the above formula.

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