US4145373A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Stress crack resistant polycarbonates
Assignee: Bayer Corp
•
Filing: 1976-02-09
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Granted: 1979-03-20
•
Expires: 1996-02-09
Abstract
Abstract Polycarbonates suitable for forming molded articles are comprised of a polycarbonate resin and 0.25 to 0.75 parts by weight per 100 parts of polycarbonate of an ethylene-vinylacetate copolymer. The articles molded from the polycarbonate resin with the ethylene-vinylacetate copolymer therein exhibit improved stress crack resistance.
Inventors
- 👤 Arthur L. Baron
- 👤 Parameswar Sivaramakrishnan
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 05:33
CPC Classifications
C; C08; C08L; C08L69/00
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
39 words
A polycarbonate comprising an intimate admixture of a polycarbonate resin and 0.25 to 0.75 parts by weight of an ethylene-vinylacetate copolymer containing 17 to 40% by weight of polymerized vinylacetate units therein per 100 parts of said polycarbonate resin.
Claim 2
Dependent Claim
39 words
A polycarbonate comprising an intimate admixture of a polycarbonate resin and 0.25 to 0.75 parts by weight of an ethylene-vinylacetate copolymer containing 17 to 40% by weight of polymerized vinylacetate units therein per 100 parts of said polycarbonate resin.
Claim 3
Dependent Claim
17 words
The polycarbonate of claim 1 wherein said ethylene-vinylacetate copolymer has a melt index between 2.1 and 42.
Claim 4
Dependent Claim
17 words
The polycarbonate of claim 1 wherein said polycarbonate resin is characterized by the repeating structural formula ##STR3##
Claim 5
Dependent Claim
41 words
A polycarbonate consisting essentially of an intimate admixture of a polycarbonate resin and 0.25 to 0.75 parts by weight of an ethylene-vinylacetate copolymer containing 17 to 40% by weight of polymerized vinylacetate units therein per 100 parts of said polycarbonate resin.
Claim 6
Dependent Claim
41 words
A polycarbonate consisting essentially of an intimate admixture of a polycarbonate resin and 0.25 to 0.75 parts by weight of an ethylene-vinylacetate copolymer containing 17 to 40% by weight of polymerized vinylacetate units therein per 100 parts of said polycarbonate resin.
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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) | 1982-03-19 | 1982-09-18 | 1983-03-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1986-03-19 | 1986-09-18 | 1987-03-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1990-03-19 | 1990-09-18 | 1991-03-20 | $7700.00 | Window Closed / Lapsed |