US4391950A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Polyphenylene ether composition and process for production
Assignee: General Electric Co
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Filing: 1981-09-02
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Granted: 1983-07-05
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Expires: 2001-09-02
Abstract
Abstract An improved polyphenylene ether composition and process for production are disclosed. Benzoic anhydride is reacted with polyphenylene ether polymer, preferably under conditions of extrusion, to produce a composition having improved color and/or color stability.
Inventors
- 👤 Glenn D. Cooper
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 12:49
CPC Classifications
C; C08; C08G; C08G65/00; C08G65/34; C08G65/48; C08G65/485
Claims Analysis
Total Claims: 18
Claim 1
Independent Claim
30 words
A thermoplastic composition having improved color properties, comprising the reaction product of polyphenylene ether with a minor amount of benzoic anhydride sufficient to improve the color or the color stability.
Claim 2
Dependent Claim
30 words
A thermoplastic composition having improved color properties, comprising the reaction product of polyphenylene ether with a minor amount of benzoic anhydride sufficient to improve the color or the color stability.
Claim 3
Dependent Claim
21 words
The composition of claim 1, wherein the concentration of benzoic anhydride is from 0.05 to 5% by weight of polyphenylene ether.
Claim 4
Dependent Claim
32 words
The composition of claim 2, wherein an admixture of polyphenylene ether and benzoic anhydride is subjected to treatment at a temperature of from 200° to 500° C. to produce the reaction product.
Claim 5
Dependent Claim
14 words
The composition of claim 3, wherein the treatment is performed by extruding the admixture.
Claim 6
Dependent Claim
21 words
The composition of claim 1, wherein the composition additionally contains from 1 to 99% of polyalkenyl aromatic resin by total weight.
Claim 7
Dependent Claim
16 words
The composition of claim 5, wherein the polyphenylene ether of the admixture is a decolorized polymer.
Claim 8
Dependent Claim
19 words
The composition of claim 6, wherein the polymer is obtained from a polymerization medium by a total isolation process.
Claim 9
Dependent Claim
44 words
A process for producing the composition of claim 1, comprising admixing polyphenylene ether with from 0.05 to 5% by weight of benzoic anhydride and subjecting said admixture to treatment at a temperature of from 200° to 500° C. to effect a color stabilizing reaction.
Claim 10
Dependent Claim
14 words
The process of claim 8, wherein the treatment is performed by extruding the admixture.
Claim 11
Dependent Claim
16 words
The process of claim 9, wherein the polyphenylene ether of the admixture is a decolorized polymer.
Claim 12
Dependent Claim
12 words
The process of claim 10, wherein decolorization is performed by catalytic hydrogenation.
Claim 13
Dependent Claim
11 words
The process of claim 10, wherein decolorization is performed by adsorption.
Claim 14
Dependent Claim
20 words
The process of claim 10, wherein the polymer is isolated from a polymerization medium by steam precipitation prior to admixing.
Claim 15
Dependent Claim
22 words
The process of claim 10, wherein the polymer is isolated from a polymerization medium by addition to hot water prior to admixing.
Claim 16
Dependent Claim
22 words
The process of claim 11, wherein the admixture is extruded with from 1 to 99% of polyalkenyl aromatic resin by total weight.
Claim 17
Dependent Claim
25 words
A thermoplastic composition characterized by improved color properties, comprising the reaction product of polyphenylene ether with from 0.05 to 5% by weight of benzoic anhydride.
Claim 18
Dependent Claim
25 words
A thermoplastic composition characterized by improved color properties, comprising the reaction product of polyphenylene ether with from 0.05 to 5% by weight of benzoic anhydride.
References Cited (Backward Citations)
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US4058504A
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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) | 1986-07-04 | 1987-01-03 | 1987-07-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1990-07-04 | 1991-01-03 | 1991-07-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1994-07-04 | 1995-01-03 | 1995-07-05 | $7700.00 | Window Closed / Lapsed |