US5087665A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Toughened, hydrolysis resistant polycarbonate/polyester blends
Assignee: Bayer Corp
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Filing: 1989-12-20
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Granted: 1992-02-11
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Expires: 2009-12-20
Abstract
Abstract It was surprisingly found that a thermoplastic molding composition which contains polycarbonate and polyalkylene terephthalate resins at a particular weight ratio therebetween is rendered improved impact strength and hydrolysis resistance upon the incorporation of an additive amount of high melt flow high density polyethylene therewith. The molding composition of the invention comprise about 20-90 percent of polycarbonate resin, 80-10 percent of polyalkylene terephthalate (preferably PET) and about 3 to 5 percent of a high density polyethylene resin having a specific gravity of 0.94-0.97 and melt flow of 1 to 80 gm/10 min. as determined in accordance with ASTM D 1238.
Inventors
- 👤 James Y. J. Chung
- 👤 John J. Charles
- 👤 Nelson R. Lazear
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 12:20
CPC Classifications
C; C08; C08L; C08L67/00; C08L67/02; C08L69/00
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
77 words
A thermoplastic molding composition comprising: (i) 65-75 percent of an aromatic polycarbonate resin, (ii) 35-25 percent of a polyethylene terephthalate resin and (iii) 3-5 percent of a high density polyethylene resin having a melt flow index of at least about 23.0 gm/10 min. as determined in accordance with ASTM D 1238 said composition being further characterized in that articles molded therefrom exhibit a characteristic ductile impact failure said percents being relative to the weight of the composition.
Claim 2
Dependent Claim
77 words
A thermoplastic molding composition comprising: (i) 65-75 percent of an aromatic polycarbonate resin, (ii) 35-25 percent of a polyethylene terephthalate resin and (iii) 3-5 percent of a high density polyethylene resin having a melt flow index of at least about 23.0 gm/10 min. as determined in accordance with ASTM D 1238 said composition being further characterized in that articles molded therefrom exhibit a characteristic ductile impact failure said percents being relative to the weight of the composition.
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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) | 1995-02-10 | 1995-08-12 | 1996-02-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1999-02-10 | 1999-08-12 | 2000-02-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2003-02-10 | 2003-08-12 | 2004-02-11 | $7700.00 | Window Closed / Lapsed |