US5164479A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for preparation of molding product from syndiotactic styrene polymer
Assignee: Idemitsu Kosan Co Ltd
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Filing: 1990-01-16
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Granted: 1992-11-17
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Expires: 2010-01-16
Abstract
Abstract Disclosed are a material for extrusion molding comprising a styrene-based polymer having a high degree of syndiotactic configuration, a melt viscosity of 10 3 to less than 10 6 poise measured at 300° C. and a shearing rate of 10/sec, and a crystallinity of 15% or more, a process for preparation of the said material and a process for preparation of a molding product therefrom. The molding product prepared according to the present invention has excellent properties such as heat resistance and chemical resistance.
Inventors
- 👤 Keisuke Funaki
- 👤 Komei Yamasaki
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 08:08
CPC Classifications
C; C08; C08L; C08L25/00; C08L25/02; C08L25/04; C08L25/06; B; B29; B29C; B29C48/00; B29C48/022; B29C48/03; C08L21/00; B29C48/05; B29C48/07; B29C48/08; B29C48/09; B29K; B29K2025/00; B29K2025/04; C08L2207/00; C08L2207/10; Y; Y10; Y10T; Y10T428/00; Y10T428/29; Y10T428/2982
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
62 words
A process for preparation of a molding product which comprises melt extruding a styrene polymer having a high degree of syndiotactic configuration, a melt viscosity of 10 3 to less than 10 6 poise measured at 300° C. and a shearing rate of 10/sec, and a crystallinity of 15% to 60%; under a shearing stress of 5×10 6 dyne/cm 2 or less.
Claim 2
Dependent Claim
62 words
A process for preparation of a molding product which comprises melt extruding a styrene polymer having a high degree of syndiotactic configuration, a melt viscosity of 10 3 to less than 10 6 poise measured at 300° C. and a shearing rate of 10/sec, and a crystallinity of 15% to 60%; under a shearing stress of 5×10 6 dyne/cm 2 or less.
Claim 3
Dependent Claim
19 words
The process according to claim 1 wherein the shearing stress is 5×10 3 to 3×10 6 dyne/cm 2 .
Claim 4
Dependent Claim
102 words
A process for preparation of a molding product which comprises melt extruding a composition consisting essentially of a styrene polymer having a high degree of syndiotactic configuration, a melt viscosity of 10 3 to less than 10 6 poise measured at 300° C. and a shearing rate of 10/sec, and a crystallinity of 15% to 60%; and at least one member selected from the group consisting of a thermoplastic resin, a rubber, an inorganic filler, an antioxidant, a nucleating resin, a plasticizer, a solubilizing agent, a colorant and a antistatic agent under a shearing stress of 5×10 6 dyne/cm 2 or less.
Claim 5
Dependent Claim
102 words
A process for preparation of a molding product which comprises melt extruding a composition consisting essentially of a styrene polymer having a high degree of syndiotactic configuration, a melt viscosity of 10 3 to less than 10 6 poise measured at 300° C. and a shearing rate of 10/sec, and a crystallinity of 15% to 60%; and at least one member selected from the group consisting of a thermoplastic resin, a rubber, an inorganic filler, an antioxidant, a nucleating resin, a plasticizer, a solubilizing agent, a colorant and a antistatic agent under a shearing stress of 5×10 6 dyne/cm 2 or less.
Claim 6
Dependent Claim
19 words
The process according to claim 3 wherein the shearing stress is 5×10 3 to 3×10 6 dyne/cm 2 .
References Cited (Backward Citations)
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EP0318794A2
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EP0325125A2
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US4959435A
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EP0356856A2
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US5006296A
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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) | 1995-11-17 | 1996-05-18 | 1996-11-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1999-11-17 | 2000-05-18 | 2000-11-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2003-11-17 | 2004-05-18 | 2004-11-17 | $7700.00 | Window Closed / Lapsed |