US4977224A
Expired / Lapsed
US
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Process for the preparation of copoly(arylene sulfide) having a decreased amount of disulfide radicals
Assignee: Eastman Chemical Co
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Filing: 1989-11-17
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Granted: 1990-12-11
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Expires: 2009-11-17
Abstract
Abstract A process for preparation of a copoly(arylene sulfide) which has a decreased amount of disulfide radicals and corresponds to the structure ##STR1## wherein A is a divalent substituted or unsubstituted aromatic radical, x is in the range of 0.45 to 0 and n is at least 50, comprising contacting a copoly(arylene sulfide) corresponding to the structure ##STR2## wherein A is a divalent substituted or unsubstituted aromatic radical, x is in the range of 0.50 to 0.001 and n is at least 25, in the melt phase with a diiodoaromatic compound corresponding to the structure I-A-I wherein A is a divalent substituted or unsubstituted aromatic radical.
Inventors
- 👤 Joseph J. Watkins
- 👤 David R. Fagerburg
- 👤 Paul B. Lawrence
- 👤 Mark Rule
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 11:05
CPC Classifications
C; C08; C08G; C08G75/00; C08G75/02; C08G75/0204; C08G75/0286; C08G75/029; C08G75/025; C08G75/0263; C08G75/14
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
114 words
A process for preparation of a copoly(arylene sulfide) which has a decreased amount of disulfide radicals and corresponds to the structure ##STR6## wherein A is a divalent substituted or unsubstituted aromatic radical, x is in the range of 0.45 to 0 and n is at least 50, comprising contacting a copoly(arylene sulfide) corresponding to the structure ##STR7## wherein A is a divalent substituted or unsubstituted aromatic radical, x is in the range of 0.50 to 0.01 and n is at least 25, in the melt phase at a temperature in the range of 257°-350° C. with a diiodoaromatic compound corresponding to the structure I-A-I wherein A is a divalent substituted or unsubstituted aromatic radical.
Claim 2
Dependent Claim
114 words
A process for preparation of a copoly(arylene sulfide) which has a decreased amount of disulfide radicals and corresponds to the structure ##STR6## wherein A is a divalent substituted or unsubstituted aromatic radical, x is in the range of 0.45 to 0 and n is at least 50, comprising contacting a copoly(arylene sulfide) corresponding to the structure ##STR7## wherein A is a divalent substituted or unsubstituted aromatic radical, x is in the range of 0.50 to 0.01 and n is at least 25, in the melt phase at a temperature in the range of 257°-350° C. with a diiodoaromatic compound corresponding to the structure I-A-I wherein A is a divalent substituted or unsubstituted aromatic radical.
Claim 3
Dependent Claim
30 words
The process of claim 1 wherein the divalent aromatic radical A is provided by a compound selected from the group consisting of diiodobenzenes, diiodonaphthalenes, diiodobiphenyls, diiodotoluenes, diiodophenyl sulfones, and diiodobenzophenones.
Claim 4
Dependent Claim
32 words
The process of claim 1 wherein the divalent aromatic radical A is provided by a compound selected from the group consisting of p-diiodobenzene, m-diiodobenzene, p,p'-diiodobiphenyl, p,p'-diiodobiphenyl ether, 2,6-diiodonaphthalene, (p-iodophenyl) sulfone, and 4,4'-diiodobenzophenone.
Claim 5
Dependent Claim
15 words
The process of claim 1 wherein the temperature is in the range of 275°-325° C.
Claim 6
Dependent Claim
105 words
A process for preparation of a copoly(arylene sulfide) which has a decreased amount of disulfide radicals and corresponds to the structure ##STR8## wherein A is a divalent substituted or unsubstituted aromatic radical, x is in the range of 0.25 to 0 and n is at least 50, comprising contacting a copoly(arylene sulfide) corresponding to the structure ##STR9## wherein A is a divalent substituted or unsubstituted aromatic radical, x is in the range of 0.30 to 0.01 and n is at least 25, in the melt phase with a diiodoaromatic compound corresponding to the structure I-A-I wherein A is a divalent substituted or unsubstituted aromatic radical.
Claim 7
Dependent Claim
105 words
A process for preparation of a copoly(arylene sulfide) which has a decreased amount of disulfide radicals and corresponds to the structure ##STR8## wherein A is a divalent substituted or unsubstituted aromatic radical, x is in the range of 0.25 to 0 and n is at least 50, comprising contacting a copoly(arylene sulfide) corresponding to the structure ##STR9## wherein A is a divalent substituted or unsubstituted aromatic radical, x is in the range of 0.30 to 0.01 and n is at least 25, in the melt phase with a diiodoaromatic compound corresponding to the structure I-A-I wherein A is a divalent substituted or unsubstituted aromatic radical.
Claim 8
Dependent Claim
105 words
A process for preparation of a copoly(arylene sulfide) which has a decreased amount of disulfide radicals and corresponds to the structure ##STR10## wherein A is a divalent substituted or unsubstituted aromatic radical, x is in the range of 0.15 to 0 and n is at least 50, comprising contacting a copoly(arylene sulfide) corresponding to the structure ##STR11## wherein A is a divalent substituted or unsubstituted aromatic radical, x is in the range of 0.20 to 0.01 and n is at least 25, in the melt phase with a diiodoaromatic compound corresponding to the structure I-A-I wherein A is a divalent substituted or unsubstituted aromatic radical.
Claim 9
Dependent Claim
105 words
A process for preparation of a copoly(arylene sulfide) which has a decreased amount of disulfide radicals and corresponds to the structure ##STR10## wherein A is a divalent substituted or unsubstituted aromatic radical, x is in the range of 0.15 to 0 and n is at least 50, comprising contacting a copoly(arylene sulfide) corresponding to the structure ##STR11## wherein A is a divalent substituted or unsubstituted aromatic radical, x is in the range of 0.20 to 0.01 and n is at least 25, in the melt phase with a diiodoaromatic compound corresponding to the structure I-A-I wherein A is a divalent substituted or unsubstituted aromatic radical.
Claim 10
Dependent Claim
105 words
A process for preparation of a copoly(arylene sulfide) which has a decreased amount of disulfide radicals and corresponds to the structure ##STR12## wherein A is a divalent substituted or unsubstituted aromatic radical, x is in the range of 0.10 to 0 and n is at least 50, comprising contacting a copoly(arylene sulfide) corresponding to the structure ##STR13## wherein A is a divalent substituted or unsubstituted aromatic radical, x is in the range of 0.15 to 0.01 and n is at least 25, in the melt phase with a diiodoaromatic compound corresponding to the structure I-A-I wherein A is a divalent substituted or unsubstituted aromatic radical.
Claim 11
Dependent Claim
105 words
A process for preparation of a copoly(arylene sulfide) which has a decreased amount of disulfide radicals and corresponds to the structure ##STR12## wherein A is a divalent substituted or unsubstituted aromatic radical, x is in the range of 0.10 to 0 and n is at least 50, comprising contacting a copoly(arylene sulfide) corresponding to the structure ##STR13## wherein A is a divalent substituted or unsubstituted aromatic radical, x is in the range of 0.15 to 0.01 and n is at least 25, in the melt phase with a diiodoaromatic compound corresponding to the structure I-A-I wherein A is a divalent substituted or unsubstituted aromatic radical.
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) | 1993-12-10 | 1994-06-11 | 1994-12-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1997-12-10 | 1998-06-11 | 1998-12-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2001-12-10 | 2002-06-11 | 2002-12-11 | $7700.00 | Window Closed / Lapsed |