Thermodegradable compositions based on crystalline homo- or copo

Details Thermodegradable compositions based on crystalline homo- or copo Thermodegradable compositions based on crystalline homo- or copo

1989-01-27

1990-08-14

Hoke, Veronica P.

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

Synthetic resins

Processes of preparing a desired or intentional composition...

523125, 524265, 525938, C08K 554, C08F 850

Patent

active

049488201

ABSTRACT:
Selective thermodegradation of homo- and copolymers of propylene, without encountering thermo-oxidation phenomena, by treating the polymer at 250.degree.-350.degree. C. in the presence of primary and/or secondary antioxidant and of a derivative of benzopinacol having formula (I): ##STR1## wherein n=1, or=0, and when n=1, X may be=1, and in this case Z.sub.1 and Z.sub.2 form together with each other ##STR2## groups, ##STR3## wherein R.sub.1, R.sub.2, R.sub.3, which may be the same or different, are alkyl or aryl radicals;

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patent: 4535174 (1985-08-01), Crivello
patent: 4556695 (1985-12-01), Ijntema
patent: 4675426 (1987-06-01), Crivello

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