Patent US5281663A successfully refreshed from Google Patents.
US5281663A
Expired / Lapsed
US
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High impact resistanct blends of thermoplastic polyesters and modified block copolymers
Assignee: Kraton Polymers US LLC
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Filing: 1992-03-31
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Granted: 1994-01-25
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Expires: 2012-03-31
Abstract
Abstract The present invention relates to a high impact resistant polymeric composition comprising a polyester and a thermally stable modified selectively hydrogenated block copolymer wherein at least one acid compound or a derivative thereof is grafted to the block copolymer. Poly(alkylene terephthalates) are preferred thermoplastic polyesters. The block copolymer will comprise at least one polymeric block of a monoalkenyl arene and at least one polymeric block of at least one conjugated diolefin.
Inventors
- 👤 Richard Gelles
- 👤 William P. Gergen
- 👤 Robert G. Lutz
- 👤 Michael J. Modic
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 11:14
CPC Classifications
C; C08; C08L; C08L51/00; C08L51/006; C08L67/00; C08L67/02; C08L51/04
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
143 words
Impact resistant polymeric compositions comprising a) 70% by weight of a first phase consisting of a thermoplastic poly(alkylene terephthalate) polyester having an intrinsic viscosity of at least 0.72, and b) 30% by weight of a second phase consisting of a modified block copolymer for supertoughening the composition, wherein said block copolymer consists of the structure A-B-A wherein each A block is at least predominantly a polymerized styrene block having a weight average molecular weight of about 7,200 and each B block is a selectively hydrogenated butadiene block having a weight average molecular weight of about 35,000, said modified block copolymer having a residual unsaturation less than 2% based on the original ethylenic unsaturation prior to hydrogenating and grafted thereto from 0.8% to 2.6% by weight of maleic anhydride, substantially all of said anhydride being grafted to said block copolymer on said B blocks.
Claim 2
Dependent Claim
143 words
Impact resistant polymeric compositions comprising a) 70% by weight of a first phase consisting of a thermoplastic poly(alkylene terephthalate) polyester having an intrinsic viscosity of at least 0.72, and b) 30% by weight of a second phase consisting of a modified block copolymer for supertoughening the composition, wherein said block copolymer consists of the structure A-B-A wherein each A block is at least predominantly a polymerized styrene block having a weight average molecular weight of about 7,200 and each B block is a selectively hydrogenated butadiene block having a weight average molecular weight of about 35,000, said modified block copolymer having a residual unsaturation less than 2% based on the original ethylenic unsaturation prior to hydrogenating and grafted thereto from 0.8% to 2.6% by weight of maleic anhydride, substantially all of said anhydride being grafted to said block copolymer on said B blocks.
Claim 3
Dependent Claim
29 words
The composition according to claim 1, wherein said amount of maleic anhydride is on the average from about 1.7% w to about 1.9% w based on said block copolymer.
Claim 4
Dependent Claim
29 words
The composition according to claim 1, wherein said residual ethylenic unsaturation of said block copolymer is 0.7% based on the original ethylenic unsaturation of block copolymer prior to hydrogenation.
Claim 5
Dependent Claim
14 words
The composition according to claim 1, wherein said thermoplastic polyester is a poly(ethylene terephthalate).
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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) | 1997-01-24 | 1997-07-26 | 1998-01-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2001-01-24 | 2001-07-26 | 2002-01-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2005-01-24 | 2005-07-26 | 2006-01-25 | $7700.00 | Window Closed / Lapsed |