US5183853A
Expired / Lapsed
US
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Articles of a new crystalline form of syndiotactic styrene polymer
Assignee: Himont Inc
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Filing: 1990-02-27
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Granted: 1993-02-02
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Expires: 2010-02-27
Abstract
Abstract Articles of syndiotactic styrene polymer where the polymer is present predominantly in a new crystalline form characterized by an X-ray spectrum which presents reflections of maximum intensity at 2 θof 12.2° and 20.0°, where in the 2 θ range from 15° to 18° no reflections of appreciable intensity appear.
Inventors
- 👤 Gaetano Guerra
- 👤 Vincenzo M. Vitagliano
- 👤 Paolo Corradini
- 👤 Enrico Albizzati
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 12:30
CPC Classifications
C; C08; C08J; C08J3/00; C08J3/12; C08J5/00; C08L; C08L25/00; C08L25/02; C08L25/04; C08L25/06; C08J2325/00; C08J2325/02; C08J2325/04; C08J2325/06; Y; Y10; Y10T; Y10T428/00; Y10T428/29; Y10T428/2982
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
68 words
A manufactured article comprising syndiotactic styrene polymer, wherein the styrene polymer is predominantly in crystalline beta' form having an X-ray spectrum having maximum intensity reflections at 2θ equal to 12.2° and 20° and no appreciable intensity reflection at 2θ from 15° to 18° and obtained by processing the melt of the syndiotactic styrene polymer at a temperature of 50° C. higher than the melting temperature of said polymer.
Claim 2
Dependent Claim
68 words
A manufactured article comprising syndiotactic styrene polymer, wherein the styrene polymer is predominantly in crystalline beta' form having an X-ray spectrum having maximum intensity reflections at 2θ equal to 12.2° and 20° and no appreciable intensity reflection at 2θ from 15° to 18° and obtained by processing the melt of the syndiotactic styrene polymer at a temperature of 50° C. higher than the melting temperature of said polymer.
Claim 3
Dependent Claim
8 words
Pellets comprising the styrene polymer of claim 1.
Claim 4
Dependent Claim
20 words
The article of claim 1 wherein the beta' form constitutes more than 90% of the syndiotactic styrene polymer crystalline fraction.
Claim 5
Dependent Claim
20 words
The pellets of claim 2 wherein the beta' form constitutes more than 90% of the syndiotactic styrene polymer crystalline fraction.
Claim 6
Dependent Claim
37 words
A manufactured article obtained by processing the melt of syndiotactic styrene polymer and polyphenylene ether mixture containing 60-95% by weight of syndiotactic styrene polymer, wherein the styrene polymer is present in the beta' form of claim 1.
Claim 7
Dependent Claim
31 words
Pellets obtained from syndiotactic styrene polymer and polyphenylene ether mixture containing 60-95% by weight of syndiotactic styrene polymer, wherein the styrene polymer is present in the beta' form of claim 1.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1996-02-02 | 1996-08-03 | 1997-02-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2000-02-02 | 2000-08-03 | 2001-02-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2004-02-02 | 2004-08-03 | 2005-02-02 | $7700.00 | Window Closed / Lapsed |