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US5055494A
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Method of improving the resistance of polyphenylene ether articles to sunlight, and articles improved by this method
Assignee: General Electric Co
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Filing: 1991-01-24
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Granted: 1991-10-08
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Expires: 2011-01-24
Abstract
Abstract The resistance to discoloring of formed articles from polymer mixtures which comprise a polyphenylene ether and at least a second polymer can be improved by treating the surface of the formed articles with a solvent. The solvent is chosen so that the polyphenylene ether does dissolve therein, but the second polymer does not dissolve therein.
Inventors
- 👤 Roelof van der Meer
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 17:55
CPC Classifications
C; C08; C08J; C08J7/00; C08J7/02
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
90 words
A method of improving the resistance to sunlight of articles formed from polymer mixtures which comprise a polyphenylene ether and at least one second polymer selected from the group consisting of a polyamide, a polyolefin, a polyester, a polyetherimide, a polyacetal, a styrene-butadienestyrene block copolymer, and mixtures thereof; wherein the surface of the formed article is treated with a solvent for a period of time sufficiently long to remove at least a portion of the polyphenylene ether, the solvent being chosen so that the second polymer does not dissolve therein.
Claim 2
Independent Claim
90 words
A method of improving the resistance to sunlight of articles formed from polymer mixtures which comprise a polyphenylene ether and at least one second polymer selected from the group consisting of a polyamide, a polyolefin, a polyester, a polyetherimide, a polyacetal, a styrene-butadienestyrene block copolymer, and mixtures thereof; wherein the surface of the formed article is treated with a solvent for a period of time sufficiently long to remove at least a portion of the polyphenylene ether, the solvent being chosen so that the second polymer does not dissolve therein.
Claim 3
Dependent Claim
12 words
The method of claim 1 wherein the polyester comprises a polyalkylene terephthalate.
Claim 4
Dependent Claim
23 words
The method of claim 2 wherein the polyalkylene terephthalate is selected from the group consisting of polybutylene terephthalate, polyethylene terephthalate, and mixtures thereof.
Claim 5
Dependent Claim
21 words
The method of claim 1 wherein the second polymer has a resistance to sunlight better than that of the polyphenylene ether.
Claim 6
Dependent Claim
12 words
The method of claim 1 wherein the solvent is an aromatic hydrocarbon.
Claim 7
Dependent Claim
12 words
The method of claim 1 wherein the solvent is a halogenated hydrocarbon.
Claim 8
Dependent Claim
27 words
The method of claim 1 wherein the solvent is selected from the group consisting of benzene, toluene, xylene, petrol, methylene chloride, chloroform, trichloroethylene, isooctane and mixtures thereof.
Claim 9
Dependent Claim
15 words
The method of claim 1 wherein the solvent component is a 50/50 mixture of toluene/isooctane.
References Cited (Backward Citations)
US4792492A
Cited
US4721732A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1994-10-07 | 1995-04-08 | 1995-10-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1998-10-07 | 1999-04-08 | 1999-10-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2002-10-07 | 2003-04-08 | 2003-10-08 | $7700.00 | Window Closed / Lapsed |