US4486578A
Expired / Lapsed
US
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Stabilized polyphenylene sulfide and method for producing same
Assignee: Toray Industries Inc
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Filing: 1983-07-01
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Granted: 1984-12-04
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Expires: 2003-07-01
Abstract
Abstract A stabilized polyphenylene sulfide is provided which comprises a recurring unit ##STR1## wherein the average n between foreign units is greater than about 5, and about 0.05 to 10 mole % per phenylene sulfide unit of an aromatic constituent chemically bonded with said polyphenylene sulfide chain, said aromatic constituent containing an electron attractive group selected from the group consisting of --SO 2 --, --CO--, --NO 2 , --SO 3 R, --COOR, wherein R is H, lower aliphatic hydrocarbon groups, aromatic hydrocarbon groups or alkaline metals, and --CONH--, and said stabilized polyphenylene sulfide has a melting point in the range of about 250° C. to about 350° C. Also provided is a method for preparing stabilized polyphenylene sulfide comprising preparing a polyphenylene sulfide consisting mainly of a recurring unit ##STR2## wherein the degree of polymerization of said recurring unit is greater than about 20, and reacting said polyphenylene sulfide with about 0.05 to about 20 mole % per said phenylene sulfide unit of a halogenated aromatic compound having an electron attractive group.
Inventors
- 👤 Toshiyuki Asakura
- 👤 Hiroaki Kobayashi
- 👤 Yukio Noguchi
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 13:31
CPC Classifications
C; C08; C08G; C08G75/00; C08G75/02; C08G75/0204; C08G75/0236; C08G75/0209; C08G75/0213; C08G75/0231; C08G75/0286
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
112 words
A stabilized crystalline polyphenylene sulfide having a reduced degree of oxidizing cross-linking characteristics, and having a crystalline melting point in the range of about 250° C. to about 350° C. which comprises at least 90 mole % of a recurring unit, ##STR25## wherein n is greater than 20, and about 0.05 to about 10 mole % per phenylene sulfide unit of an aromatic constituent chemically bonded with said polyphenylene sulfide chain, said aromatic constituent containing an electron attractive group selected from the group consisting of --SO 2 --, --CO--, --NO 2 , --SO 3 R, and --COOR, wherein R is H, lower aliphatic hydrocarbon groups, aromatic hydrocarbon groups, alkaline metals, or --CONH--.
Claim 2
Dependent Claim
112 words
A stabilized crystalline polyphenylene sulfide having a reduced degree of oxidizing cross-linking characteristics, and having a crystalline melting point in the range of about 250° C. to about 350° C. which comprises at least 90 mole % of a recurring unit, ##STR25## wherein n is greater than 20, and about 0.05 to about 10 mole % per phenylene sulfide unit of an aromatic constituent chemically bonded with said polyphenylene sulfide chain, said aromatic constituent containing an electron attractive group selected from the group consisting of --SO 2 --, --CO--, --NO 2 , --SO 3 R, and --COOR, wherein R is H, lower aliphatic hydrocarbon groups, aromatic hydrocarbon groups, alkaline metals, or --CONH--.
Claim 3
Dependent Claim
24 words
The stabilized polyphenylene sulfide of claim 1 wherein the electron attractive group is selected from the group consisting of --SO 2 -- and --CO--.
Claim 4
Dependent Claim
30 words
The stabilized polyphenylene sulfide of claim 1 wherein the viscosity is at least 100 poise at a temperature of 300° C. and a shear rate of 200 sec. -1 .
Claim 5
Dependent Claim
11 words
A film formed of the stabilized polyphenylene sulfide of claim 1.
Claim 6
Dependent Claim
13 words
An injection molded product formed of the stabilized polyphenylene sulfide of claim 1.
Claim 7
Dependent Claim
11 words
A fiber formed of the stabilized polyphenylene sulfide of claim 1.
Claim 8
Dependent Claim
14 words
A powder for electronic parts encapsulation of the stabilized polyphenylene sulfide of claim 1.
Claim 9
Independent Claim
133 words
A method of preparing a stabilized crystalline polyphenylene sulfide having a reduced degree of oxidizing crosslinking characteristics and having a crystalline melting point in the range of about 250° C. to about 350° C., which comprises preparing a polyphenylene sulfide consisting of at least 90 mole % of a recurring unit, ##STR26## wherein n is greater than about 20, and reacting said polyphenylene sulfide at 150° to 280° C. with 0.05 to 20 mole % per said phenylene sulfide unit of a halogenated aromatic constituent chemically bonded with said polyphenylene sulfide chain, the aromatic constituent containing an electron attractive group selected from the group consisting of --SO 2 --, --CO--, --NO 2 , --SO 3 R, and --COOR, wherein R is H, lower aliphatic hydrocarbon groups, aromatic hydrocarbon groups, alkaline metals or --CONH--.
Claim 10
Independent Claim
133 words
A method of preparing a stabilized crystalline polyphenylene sulfide having a reduced degree of oxidizing crosslinking characteristics and having a crystalline melting point in the range of about 250° C. to about 350° C., which comprises preparing a polyphenylene sulfide consisting of at least 90 mole % of a recurring unit, ##STR26## wherein n is greater than about 20, and reacting said polyphenylene sulfide at 150° to 280° C. with 0.05 to 20 mole % per said phenylene sulfide unit of a halogenated aromatic constituent chemically bonded with said polyphenylene sulfide chain, the aromatic constituent containing an electron attractive group selected from the group consisting of --SO 2 --, --CO--, --NO 2 , --SO 3 R, and --COOR, wherein R is H, lower aliphatic hydrocarbon groups, aromatic hydrocarbon groups, alkaline metals or --CONH--.
Claim 11
Dependent Claim
17 words
The method of claim 8 wherein said halogenated aromatic compound having an electron attractive group is ##STR27##
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1987-12-04 | 1988-06-04 | 1988-12-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1991-12-04 | 1992-06-04 | 1992-12-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1995-12-04 | 1996-06-04 | 1996-12-04 | $7700.00 | Window Closed / Lapsed |