US4771096A
Expired / Lapsed
US
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Polymer mixture comprising a polyphenylene ether and optionally a polystyrene and/or a rubber-modified polystyrene, and articles formed therefrom
Assignee: General Electric Co
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Filing: 1984-03-29
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Granted: 1988-09-13
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Expires: 2004-03-29
Abstract
Abstract Polyphenylene ethers may show the property that their molecular weight increases considerably upon extrusion. This increase of the molecular weight leads to less good flow properties. It has been found that the addition of a conjugated, non-aromatic diene compound or of a dienophilic compound suppresses the increase of the molecular weight under extrusion.
Inventors
- 👤 Jan Bussink
- 👤 Roelof van der Meer
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 05:09
CPC Classifications
C; C08; C08K; C08K5/00; C08K5/0008; C08F; C08F283/00; C08F283/06; C08F283/08; C08K5/01; C08L; C08L71/00; C08L71/08; C08L71/10; C08L71/12; C08L71/126; Y; Y10; Y10S; Y10S525/00; Y10S525/905
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
40 words
A polymer mixture comprising: (a) a polyphenylene ether resin or a mixture of polyphenylene ether resin and polystyrene resin; and (b) 0.1 to 5.0% by weight based upon the weight of said polyphenylene ether resin of a monofunctional dienophilic compound.
Claim 2
Dependent Claim
40 words
A polymer mixture comprising: (a) a polyphenylene ether resin or a mixture of polyphenylene ether resin and polystyrene resin; and (b) 0.1 to 5.0% by weight based upon the weight of said polyphenylene ether resin of a monofunctional dienophilic compound.
Claim 3
Dependent Claim
21 words
A polymer mixture as claimed in claim 1, characterized in that the mixture further comprises 5-40% by weight of glass fibres.
Claim 4
Dependent Claim
23 words
A polymer mixture as claimed in claim 1, characterized in that the mixture also comprises an agent to give the mixture flame-retarding properties.
Claim 5
Dependent Claim
24 words
A polymer mixture as claimed in claim 1, characterized in that the mixture also comprises a block copolymer having styrene blocks and butadiene blocks.
Claim 6
Dependent Claim
11 words
Articles formed from the polymer mixture as claimed in claim 1.
Claim 7
Dependent Claim
39 words
A polymer mixture as in claim 1 wherein said dienophilic compound is selected from the group consisting of maleimide, N-alkylmaleimide, N-arylmaleimide, acenaphthylene, indene, cinnamaldehyde, maleic acid anhydride, N-alkylmaleic acid anhydride, N-arylmaleic acid anhydride, N-arylmaleic acid amide, naphthoquinone, and 2-methyl-1,4-naphthoquinone.
Claim 8
Dependent Claim
14 words
A polymer mixture as in claim 1 wherein said polystyrene resin is rubber-modified polystyrene.
References Cited (Backward Citations)
US4373055A
Cited
US4389516A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1991-09-13 | 1992-03-14 | 1992-09-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1995-09-13 | 1996-03-14 | 1996-09-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1999-09-13 | 2000-03-14 | 2000-09-13 | $7700.00 | Window Closed / Lapsed |