Process for the degradation of polymers
AssigneeAkzona Incorporated
InventorsWillem F. Verhelst, Ulfert E. Wiersum
Life of this patent
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Abstract
This disclosure relates to a process for the degradation of polymers in the presence of a free radical initiator. In particular this disclosure relates to a process for the degradation of polymers employing a free radical initiator selected from a class of hydroximic acid derivatives.
Claims18
In an improved process for degradation of polymers, the improvement comprises employing as a free radical initiator a compound of the formula ##STR5## wherein R.sub.1 is selected from the class consisting of substituted or unsubstituted:
- C.sub.1 -C.sub.22 alkyl, C.sub.2 -C.sub.22 alkenyl, C.sub.6 -C.sub.20 cyclohexyl, C.sub.6 -C.sub.20, phenyl, and C.sub.7 -C.sub.20 aralkyl;
- R.sub.2 is selected from the class consisting of substituted or unsubstituted:
- C.sub.1 -C.sub.20 alkyl, C.sub.2 -C.sub.20 alkenyl, C.sub.6 -C.sub.20 cyclohexyl, C.sub.6 -C.sub.20 phenyl, C.sub.7 -C.sub.20 aralkyl, C.sub.2 -C.sub.21 alkylcarbonyl, C.sub.3 -C.sub.21 alkenylcarbonyl, C.sub.7 -C.sub.21 cyclohexylcarbonyl, C.sub.7 -C.sub.21 phenylcarbonyl, C.sub.8 -C.sub.21 aralkylcarbonyl, C.sub.7 -C.sub.21 alkoxycarbonyl, C.sub.3 -C.sub.21 alkenyloxycarbonyl, C.sub.7 -C.sub.21 cyclohexyloxycarbonyl, C.sub.7 -C.sub.21 phenoxycarbonyl and C.sub.8 -C.sub.21 aralkyloxycarbonyl;
- and
- R.sub.3 is hydrogen, a group selected from the class consisting of substituted or unsubstituted:
- C.sub.1 -C.sub.20 alkyl, C.sub.2 -C.sub.20 alkenyl, C.sub.6 -C.sub.20 cyclohexyl, C.sub.6 -C.sub.20 phenyl, C.sub.7 -C.sub.20 aralkyl, C.sub.2 -C.sub.21 alkylcarbonyl, C.sub.3 -C.sub.21 alkenylcarbonyl C.sub.7 -C.sub.21 cyclohexylcarbonyl, C.sub.7 -C.sub.21 phenylcarbonyl, C.sub.8 -C.sub.21 aralkylcarbonyl, C.sub.7 -C.sub.21 alkoxycarbonyl, C.sub.3 -C.sub.21 alkenyloxycarbonyl, C.sub.7 -C.sub.21 cyclohexyloxycarbonyl, C.sub.7 -C.sub.21 phenyloxycarbonyl and C.sub.8 -C.sub.21 aralkyloxycarbonyl;
- a ##STR6## group wherein X is substituted or unsubstituted:
- C.sub.1 -C.sub.12 alkylene, C.sub.2 -C.sub.12 alkenylene, C.sub.6 -C.sub.12 cycloalkylene or phenylene;
- or a
- --SO.sub.2 Y
- group wherein Y is substituted or unsubstituted:
- C.sub.1 -C.sub.20 alkyl, C.sub.6 -C.sub.20 cycloalkyl or phenyl.
In an improved process for the degradation of polypropylene, the improvement comprising employing as a free radical initiator a compound of the formula ##STR8## wherein R.sub.1 is selected from the class consisting of C.sub.2 -C.sub.20 alkyl and C.sub.6 -C.sub.20 phenyl;
- and
- R.sub.2 and R.sub.3 are independently selected from the class consisting of C.sub.2 -C.sub.20 alkyl and C.sub.7 -C.sub.21 phenylcarbonyl.
Dependencies are inferred from the claim text.