US4946897A
Expired / Lapsed
US
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Thermoplastic compositions based on syndiotactic polymers of styrene and polyphenylene ethers
Assignee: Montedipe SpA
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Filing: 1988-10-24
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Granted: 1990-08-07
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Expires: 2008-10-24
Abstract
Abstract Compositions comprising from 5 to 50% by weight of a polyphenylene ether and from 95 to 50% by weight of a styrene polymer having a syndiotactic structure. Such compositions are endowed with enhanced mechanical properties compared to those containing amorphous polystyrene, or polystyrene having an isotactic structure.
Inventors
- 👤 Enrico Albizzati
- 👤 Italo Borghi
- 👤 Franco Fattorini
- 👤 Giovanni Giunchi
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 20:16
CPC Classifications
C; C08; C08L; C08L25/00; C08L25/02; C08L25/04; C08L25/06; C08L71/00; C08L71/08; C08L71/10; C08L71/12
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
68 words
Compositions comprising: from 50 to 95% by weight of at least one styrene polymer having an essentially syndiotactic structure characterized by an H-NMR spectrum showing chemical shifts of methynic and methylenic protons respectively centered at 1.9 and 1.4 ppm; and from 50 to 5% by weight of at least one polyphenylene ether, with respect to the sum of the weights of the styrene polymer plus the polyethylene ether.
Claim 2
Dependent Claim
68 words
Compositions comprising: from 50 to 95% by weight of at least one styrene polymer having an essentially syndiotactic structure characterized by an H-NMR spectrum showing chemical shifts of methynic and methylenic protons respectively centered at 1.9 and 1.4 ppm; and from 50 to 5% by weight of at least one polyphenylene ether, with respect to the sum of the weights of the styrene polymer plus the polyethylene ether.
Claim 3
Dependent Claim
26 words
Compositions according to claim 1, comprising from 60 to 90% by weight of a styrene polymer, and from 40 to 10% by weight of polyphenylene ether.
Claim 4
Dependent Claim
27 words
Compositions according to claim 1 or 2, wherein the styrene polymer has a weight average molecular weight from 25,000 to 1,200,000, and preferably from 100,000 to 800,000.
Claim 5
Dependent Claim
27 words
Compositions according to claim 1 or 2, wherein the styrene polymer has a melting temperature of at least 250° C., and preferably from 260° to 275° C.
Claim 6
Dependent Claim
13 words
Compositions according to claim 1 or 2, wherein the styrene polymer is polystyrene.
Claim 7
Dependent Claim
13 words
Compositions according to claim 1 or 2, wherein the styrene polymer is poly-para-methyl-styrene.
Claim 8
Dependent Claim
15 words
Compositions according to claim 1 or 2, wherein the styrene polymer is a styrene/para-methyl-styrene copolymer.
Claim 9
Dependent Claim
99 words
Compositions according to claim 1 or 2, wherein the polyphenylene ether contains recurring units of the formula: ##STR2## wherein the ether-oxygen of a unit is linked to the benzene ring of the adjacent unit, n is an integer larger than 50, R 1 and R 2 , equal to or different from each other, are hydrogen atoms or halogen atoms, hydrocarbon radicals not containing tertiary carbon atoms in the alpha position, halo-hydrocarbon radicals or halohydrocarboxy radicals containing at least two carbon atoms between the benzene ring and the halogen atom, and not containing tertiary carbon atoms in the alpha-position.
Claim 10
Dependent Claim
28 words
Compositions according to claim 8, wherein at least one of the R 1 and R 2 radicals is an alkyl group containing from 1 to 4 carbon atoms.
Claim 11
Dependent Claim
11 words
Compositions according to claim 8, wherein the polyphenylene ether is poly(2,6-dimethyl-1,4-phenylene)ether.
Claim 12
Dependent Claim
11 words
Compositions according to claim 8 wherein the polyphenylene ether is poly(2,6-dimethyl-1,4-phenylene)ether.
References Cited (Backward Citations)
US3383435A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1993-08-06 | 1994-02-05 | 1994-08-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1997-08-06 | 1998-02-05 | 1998-08-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2001-08-06 | 2002-02-05 | 2002-08-07 | $7700.00 | Window Closed / Lapsed |