Free-radical polymerizations using mixed initiator systems at tw

Details Free-radical polymerizations using mixed initiator systems at tw Free-radical polymerizations using mixed initiator systems at tw

1977-01-06

1978-12-12

Lilling, Herbert J.

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

Synthetic resins

Polymers from only ethylenic monomers or processes of...

526228, 526346, C08F 438, C08F 218, C08F 202, C08F 1208

Patent

active

041297032

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.degree. C and 150.degree. 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 ##STR1## wherein R is an alkylene, alkynylene or alkenylene diradical, R.sub.1 is alkyl, alkenyl, alkyn or alkoxy and Rhd 2 is lower alkyl and R.sub.3 is hydrogen or a lower alkyl and a second of which initiators has a 10 hour half-life temperature of at least about 80.degree. C which temperature is at least about 15.degree. C above the 10 hour half-life temperature of the compound of the above formula.

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patent: 3726848 (1973-04-01), Squire et al.
patent: 3817965 (1974-06-01), Mace et al.
Swern "Organic Peroxides" vol. I. pp. 81-87 Wiley Interscience.
Brandrup et al., "Polymer Handbook" pp. II-1 to II 53 Interscience Publ.

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