US4374938A
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Process for the degradation of polymers
Assignee: Akzona Inc
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Filing: 1981-02-20
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Granted: 1983-02-22
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Expires: 2001-02-20
Abstract
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.
Inventors
- 👤 Willem F. Verhelst
- 👤 Ulfert E. Wiersum
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 21:43
CPC Classifications
C; C08; C08F; C08F255/00; C08F255/02; C08F4/00; C08K; C08K5/00; C08K5/16; C08K5/32; C08K5/33
Claims Analysis
Total Claims: 20
Claim 1
Independent Claim
292 words
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 1 is selected from the class consisting of substituted or unsubstituted: C 1 -C 22 alkyl, C 2 -C 22 alkenyl, C 6 -C 20 cyclohexyl, C 6 -C 20 , phenyl, and C 7 -C 20 aralkyl; R 2 is selected from the class consisting of substituted or unsubstituted: C 1 -C 20 alkyl, C 2 -C 20 alkenyl, C 6 -C 20 cyclohexyl, C 6 -C 20 phenyl, C 7 -C 20 aralkyl, C 2 -C 21 alkylcarbonyl, C 3 -C 21 alkenylcarbonyl, C 7 -C 21 cyclohexylcarbonyl, C 7 -C 21 phenylcarbonyl, C 8 -C 21 aralkylcarbonyl, C 7 -C 21 alkoxycarbonyl, C 3 -C 21 alkenyloxycarbonyl, C 7 -C 21 cyclohexyloxycarbonyl, C 7 -C 21 phenoxycarbonyl and C 8 -C 21 aralkyloxycarbonyl; and R 3 is hydrogen, a group selected from the class consisting of substituted or unsubstituted: C 1 -C 20 alkyl, C 2 -C 20 alkenyl, C 6 -C 20 cyclohexyl, C 6 -C 20 phenyl, C 7 -C 20 aralkyl, C 2 -C 21 alkylcarbonyl, C 3 -C 21 alkenylcarbonyl C 7 -C 21 cyclohexylcarbonyl, C 7 -C 21 phenylcarbonyl, C 8 -C 21 aralkylcarbonyl, C 7 -C 21 alkoxycarbonyl, C 3 -C 21 alkenyloxycarbonyl, C 7 -C 21 cyclohexyloxycarbonyl, C 7 -C 21 phenyloxycarbonyl and C 8 -C 21 aralkyloxycarbonyl; a ##STR6## group wherein X is substituted or unsubstituted: C 1 -C 12 alkylene, C 2 -C 12 alkenylene, C 6 -C 12 cycloalkylene or phenylene; or a --SO.sub.2 Y group wherein Y is substituted or unsubstituted: C 1 -C 20 alkyl, C 6 -C 20 cycloalkyl or phenyl.
Claim 2
Dependent Claim
292 words
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 1 is selected from the class consisting of substituted or unsubstituted: C 1 -C 22 alkyl, C 2 -C 22 alkenyl, C 6 -C 20 cyclohexyl, C 6 -C 20 , phenyl, and C 7 -C 20 aralkyl; R 2 is selected from the class consisting of substituted or unsubstituted: C 1 -C 20 alkyl, C 2 -C 20 alkenyl, C 6 -C 20 cyclohexyl, C 6 -C 20 phenyl, C 7 -C 20 aralkyl, C 2 -C 21 alkylcarbonyl, C 3 -C 21 alkenylcarbonyl, C 7 -C 21 cyclohexylcarbonyl, C 7 -C 21 phenylcarbonyl, C 8 -C 21 aralkylcarbonyl, C 7 -C 21 alkoxycarbonyl, C 3 -C 21 alkenyloxycarbonyl, C 7 -C 21 cyclohexyloxycarbonyl, C 7 -C 21 phenoxycarbonyl and C 8 -C 21 aralkyloxycarbonyl; and R 3 is hydrogen, a group selected from the class consisting of substituted or unsubstituted: C 1 -C 20 alkyl, C 2 -C 20 alkenyl, C 6 -C 20 cyclohexyl, C 6 -C 20 phenyl, C 7 -C 20 aralkyl, C 2 -C 21 alkylcarbonyl, C 3 -C 21 alkenylcarbonyl C 7 -C 21 cyclohexylcarbonyl, C 7 -C 21 phenylcarbonyl, C 8 -C 21 aralkylcarbonyl, C 7 -C 21 alkoxycarbonyl, C 3 -C 21 alkenyloxycarbonyl, C 7 -C 21 cyclohexyloxycarbonyl, C 7 -C 21 phenyloxycarbonyl and C 8 -C 21 aralkyloxycarbonyl; a ##STR6## group wherein X is substituted or unsubstituted: C 1 -C 12 alkylene, C 2 -C 12 alkenylene, C 6 -C 12 cycloalkylene or phenylene; or a --SO.sub.2 Y group wherein Y is substituted or unsubstituted: C 1 -C 20 alkyl, C 6 -C 20 cycloalkyl or phenyl.
Claim 3
Dependent Claim
259 words
A process according to claim 1, wherein R 1 is selected from the class consisting of C 1 -C 22 alkyl, C 2 -C 22 alkenyl, C 6 -C 20 cyclohexyl, C 6 -C 20 phenyl and C 7 -C 20 aralkyl; R 2 is selected from the class consisting of C 1 -C 20 alkyl, C 2 -C 20 alkenyl, C 6 -C 20 cyclohexyl, C 6 -C 20 phenyl, C 7 -C 20 aralkyl, C 2 -C 21 alkylcarbonyl, C 3 -C 21 alkenylcarbonyl, C 7 -C 21 cyclohexylcarbonyl, C 7 -C 21 phenylcarbonyl, C 8 -C 21 aralkylcarbonyl, C 7 -C 21 alkoxycarbonyl, C 3 -C 21 alkenyloxycarbonyl, C 7 -C 21 cyclohexyloxycarbonyl, C 7 -C 21 phenoxycarbonyl and C 8 -C 21 aralkyloxycarbonyl; and R 3 is hydrogen, a group selected from the class consisting of C 1 -C 20 alkyl, C 2 -C 20 alkenyl, C 6 -C 20 cyclohexyl, C 6 -C 20 phenyl, C 7 -C 20 aralkyl, C 2 -C 21 alkylcarbonyl, C 3 -C 21 alkenylcarbonyl C 7 -C 21 cyclohexylcarbonyl, C 7 -C 21 phenylcarbonyl, C 8 -C 21 aralkylcarbonyl, C 7 -C 21 alkoxycarbonyl, C 3 -C 21 alkenyloxycarbonyl, C 7 -C 21 cyclohexyloxycarbonyl, C 7 -C 21 phenyloxycarbonyl and C 8 -C 21 aralkyloxycarbonyl; a ##STR7## group wherein X is C 1 -C 12 alkylene, C 2 -C 12 alkenylene, C 6 -C 12 cycloalkylene or phenylene; or a --SO.sub.2 Y group wherein Y is C 1 -C 20 alkyl, C 6 -C 20 cycloalkyl or phenyl.
Claim 4
Dependent Claim
32 words
A process according to claim 2, wherein R 2 is C 1 -C 20 alkyl, C 2 -C 20 alkenyl, cyclohexyl or C 7 -C 20 aralkyl, and R 3 is hydrogen.
Claim 5
Dependent Claim
26 words
A process according to claim 2, wherein R 2 and R 3 are independently C 1 -C 20 alkyl, cyclohexyl or C 7 -C 20 aralkyl.
Claim 6
Dependent Claim
19 words
A process according to claim 2, wherein R 2 and R 3 are independently C 7 -C 21 phenylcarbonyl.
Claim 7
Dependent Claim
58 words
A process according to claim 2, wherein R 2 is C 1 -C 20 alkyl, C 2 -C 20 alkenyl, cyclohexyl, phenyl or C 7 -C 20 aralkyl, and R 3 is C 2 -C 21 alkoxycarbonyl, C 3 -C 21 alkenyloxycarbonyl, C 7 -C 21 cyclohexyloxycarbonyl, C 7 -C 21 phenyloxycarbonyl or C 8 -C 21 aralkyloxycarbonyl.
Claim 8
Dependent Claim
135 words
A process according to claim 2, wherein R 2 and R 3 are selected from the class represented by R 4 and R 5 , wherein R 4 is selected from the class consisting of C 1 -C 20 alkyl, C 2 -C 20 alkenyl, cyclohexyl, phenyl and C 7 -C 20 aralkyl and R 5 is selected from the class consisting of C 2 -C 21 alkylcarbonyl, C 3 -C 21 alkenylcarbonyl, C 7 -C 21 cyclohexylcarbonyl, C 6 -C 21 phenylcarbonyl and C 8 -C 21 aralkyl; provided that if R 2 is a group represented by R 4 , then R 3 is a group represented by R 5 and if R 2 is a group represented by R 5 , then R 3 is a group represented by R 4 .
Claim 9
Dependent Claim
32 words
A process according to claim 7, wherein R 1 is C 2 -C 20 alkyl, R 2 is C 1 -C 5 alkyl and R 3 is C 7 -C 21 phenylcarbonyl.
Claim 10
Dependent Claim
12 words
A process according to claim 8, wherein the initiator is ethyl-O-benzoyl dodecanehydroximate.
Claim 11
Dependent Claim
33 words
A process according to claim 1, wherein R 2 is substituted: C 1 -C 20 alkyl, C 2 -C 20 alkenyl, cyclohexyl or C 7 -C 20 aralkyl, and R 3 is hydrogen.
Claim 12
Dependent Claim
27 words
A process according to claim 1, wherein R 2 and R 3 are independently substituted: C 1 -C 20 alkyl, cyclohexyl or C 7 -C 20 aralkyl.
Claim 13
Dependent Claim
20 words
A process according to claim 1, wherein R 2 and R 3 are independently substituted C 7 -C 21 phenylcarbonyl.
Claim 14
Dependent Claim
55 words
A process according to claim 1, wherein R 2 is substituted: C 1 -C 20 alkenyl, cyclohexyl, phenyl or C 7 -C 20 aralkyl, and R 3 is substituted: C 2 -C 21 alkoxycarbonyl, C 3 -C 21 alkenyloxycarbonyl, C 7 -C 21 cyclohexyloxycarbonyl, C 7 -C 21 phenyloxycarbonyl or C 8 -C 21 aralkyloxycarbonyl.
Claim 15
Dependent Claim
137 words
A process according to claim 1, wherein R 2 and R 3 are selected from the class represented by R 4 and R 5 , wherein R 4 is selected from the class consisting of substituted: C 1 -C 20 alkyl, C 2 -C 20 alkenyl, cyclohexyl, phenyl and C 7 -C 20 aralkyl and R 5 is selected from the class consisting of substituted: C 2 -C 21 alkylcarbonyl, C 3 -C 21 alkenylcarbonyl, C 7 -C 21 cyclohexylcarbonyl, C 6 -C 21 phenylcarbonyl and C 8 -C 21 aralkyl; provided that if R 2 is a group represented by R 4 , then R 3 is a group represented by R 5 and if R 2 is a group represented by R 5 , then R 3 is a group represented by R 4 .
Claim 16
Dependent Claim
34 words
A process according to claim 1, wherein R 1 is C 2 -C 20 alkyl, R 2 is C 1 -C 5 alkyl and R 3 is a substituted C 7 -C 21 phenylcarbonyl.
Claim 17
Dependent Claim
41 words
A process according to claim 1, wherein the substituted R 1 , R 2 , R 3 , X or Y groups contain substituents selected from the class consisting of alkyl, cyclohexyl, phenyl, phenyloxy, aralkyl, aralkyloxy, carboxyl, amino, nitro and halo.
Claim 18
Dependent Claim
22 words
In an improved process for degradation of polypropylene the improvement comprises employing as a free radical initiator a compound of claim 1.
Claim 19
Dependent Claim
70 words
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 1 is selected from the class consisting of C 2 -C 20 alkyl and C 6 -C 20 phenyl; and R 2 and R 3 are independently selected from the class consisting of C 2 -C 20 alkyl and C 7 -C 21 phenylcarbonyl.
Claim 20
Dependent Claim
70 words
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 1 is selected from the class consisting of C 2 -C 20 alkyl and C 6 -C 20 phenyl; and R 2 and R 3 are independently selected from the class consisting of C 2 -C 20 alkyl and C 7 -C 21 phenylcarbonyl.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1986-02-21 | 1986-08-23 | 1987-02-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1990-02-21 | 1990-08-23 | 1991-02-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1994-02-21 | 1994-08-23 | 1995-02-22 | $7700.00 | Window Closed / Lapsed |