Patent US4529761A successfully refreshed from Google Patents.
US4529761A
Expired / Lapsed
US
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Polyphenylene ether resin compositions
Assignee: General Electric Co
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Filing: 1983-10-27
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Granted: 1985-07-16
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Expires: 2003-10-27
Abstract
Abstract The present invention deals with polymer blends comprising a polyphenylene ether and optionally polystyrene or a rubber modified polystyrene. It has been found that the addition of an alkyl or aralkyl-sulfonate to such blends improves the environmental stress cracking resistance of such blends.
Inventors
- 👤 Johannes H. G. M. Lohmeijer
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 07:25
CPC Classifications
C; C08; C08K; C08K5/00; C08K5/36; C08K5/41; C08K5/42
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
90 words
A polymer composition exhibiting improved environmental stress crack resistance, consisting essentially of: (a) a thermoplastic resin base polymer selected from the group consisting of polyphenylene ether resins and polyphenylene ether modified with alkenyl aromatic resins; and (b) an amount of environmental stress crack resistance agent effective for improving the environmental stress crack resistance of said thermoplastic resin wherein said agent is a compound of the formula R--SO 3 X wherein R represents an alkyl or aralkyl radical having 5 to 25 carbon atoms and X represents an alkali metal ion.
Claim 2
Dependent Claim
90 words
A polymer composition exhibiting improved environmental stress crack resistance, consisting essentially of: (a) a thermoplastic resin base polymer selected from the group consisting of polyphenylene ether resins and polyphenylene ether modified with alkenyl aromatic resins; and (b) an amount of environmental stress crack resistance agent effective for improving the environmental stress crack resistance of said thermoplastic resin wherein said agent is a compound of the formula R--SO 3 X wherein R represents an alkyl or aralkyl radical having 5 to 25 carbon atoms and X represents an alkali metal ion.
Claim 3
Dependent Claim
29 words
A polymer composition as in claim 1 wherein said environmental stress crack resistance agent is present in an amount of 0.5 to 10.0% by weight of the thermoplastic resin.
Claim 4
Dependent Claim
38 words
A polymer composition as in claim 1 wherein said agent is a mixture of compounds having the formula R--SO 3 X and R represents alkyl radicals having 12 to 20 carbon atoms and X is a sodium ion.
Claim 5
Dependent Claim
14 words
A polymer composition as in claim 1 wherein said polyphenylene ether resin is poly(2,6-dimethyl-1,4-phenylene)ether.
Claim 6
Dependent Claim
16 words
A polymer composition as in claim 1 wherein said alkenyl aromatic resin is high impact polystyrene.
Claim 7
Independent Claim
97 words
A method for improving the environmental stress crack resistance of a polymer composition comprising the steps of: mixing a thermoplastic resin based polymer selected from the group consisting of polyphenylene ether resins and polyphenylene ether modified alkenyl aromatic resins with an environmental stress crack improving amount of a stress improving agent having the formula R--SO 3 X wherein R is alkyl or aralkyl radical having 5-25 carbon atoms and X is a alkali metal ion thereby providing a stress crack resistant polymer composition; molding said polymer composition into a shaped article exhibiting improved environmental stress crack resistance.
Claim 8
Independent Claim
97 words
A method for improving the environmental stress crack resistance of a polymer composition comprising the steps of: mixing a thermoplastic resin based polymer selected from the group consisting of polyphenylene ether resins and polyphenylene ether modified alkenyl aromatic resins with an environmental stress crack improving amount of a stress improving agent having the formula R--SO 3 X wherein R is alkyl or aralkyl radical having 5-25 carbon atoms and X is a alkali metal ion thereby providing a stress crack resistant polymer composition; molding said polymer composition into a shaped article exhibiting improved environmental stress crack resistance.
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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) | 1988-07-15 | 1989-01-14 | 1989-07-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1992-07-15 | 1993-01-14 | 1993-07-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1996-07-15 | 1997-01-14 | 1997-07-16 | $7700.00 | Window Closed / Lapsed |