Process for preparing acrylic polymer sheets using a dual peroxi

Details Process for preparing acrylic polymer sheets using a dual peroxi Process for preparing acrylic polymer sheets using a dual peroxi

1985-02-01

1986-05-13

Wong, Jr., Harry

Synthetic resins or natural rubbers -- part of the class 520 ser

Synthetic resins

Polymers from only ethylenic monomers or processes of...

525263, 526309, 5263232, 5263285, 5263292, 5263293, 5263295, 5263297, C08F 438, C08F 2014

Patent

active

045887985

ABSTRACT:
A process for producing acrylic polymers which have high thermal stability, are free of defects and have a low level of unreacted monomer. The process includes the polymerization at a high production rate of a methyl methacrylate syrup in the presence of a mixture of two peroxide initiators. The first initiator has a 5-minute half-life at temperatures between about 75.degree. C. to 100.degree. C. and emits a maximum of 1 mole of carbon dioxide per 2 moles of free radicals. The second initiator has a one minute half-life at temperatures of between about 105.degree. C. to about 125.degree. C. and emits a maximum of 1 mole of carbon dioxide per 1 mole of free radicals.

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