Thermodegradable compositions based on crystalline homo- or copolymers of propylene and process for carrying out the selective degradation of such homo- and copolymers
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United States of America Patent
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Aug 14, 1990
Grant Date -
N/A
app pub date -
Jan 27, 1989
filing date -
Jan 28, 1988
priority date (Note) -
Expired
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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; or X ranges from 3 to 20 and in this case Z.sub.1 and Z.sub.2 are aryl radicals, A and B are R.sub.1 -Si-R.sub.2 groups that are part of an oligomer having formula: ##STR4## and when n=0, X is=1, Z.sub.1 and Z.sub.2 are aryl radicals, and ##STR5##
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