US4639481A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Modified thermoplastic polyester molding compositions and articles molded therefrom
Assignee: General Electric Co
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Filing: 1985-04-09
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Granted: 1987-01-27
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Expires: 2005-04-09
Abstract
Abstract Thermoplastic molding compositions which comprise (a) a poly(C 2-6 alkylene terephthalate) resin and a major proportion of (b) an aromatic polycarbonate resin with (c) a polyolefin resin or an olefin copolymer, provide molded articles of improved impact resistance. In preferred embodiments, articles molded from the compositions possess improved impact resistance, lower specific gravity, good tensile strength, and improved resistance to distortion at elevated temperatures under load.
Inventors
- 👤 Harold F. Giles, Jr.
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 16:38
CPC Classifications
C; C08; C08L; C08L69/00
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
65 words
A thermoplastic molding composition comprising: (a) from about 15 to about 49 parts by weight of poly(C 2-6 alkylene terephthalate) resin; (b) from about 51 to about 80 parts by weight of an aromatic polycarbonate resin; and (c) from about 5 to about 20 parts by weight of a polyolefin copolymer consisting of ethylene and propylene reaction products or ethylene, propylene and diene reaction products.
Claim 2
Dependent Claim
65 words
A thermoplastic molding composition comprising: (a) from about 15 to about 49 parts by weight of poly(C 2-6 alkylene terephthalate) resin; (b) from about 51 to about 80 parts by weight of an aromatic polycarbonate resin; and (c) from about 5 to about 20 parts by weight of a polyolefin copolymer consisting of ethylene and propylene reaction products or ethylene, propylene and diene reaction products.
Claim 3
Dependent Claim
16 words
A composition according to claim 1 wherein said poly(C 2-6 alkylene terephthalate) resin is poly(ethylene terephthalate).
Claim 4
Dependent Claim
13 words
A composition according to claim 1 wherein said olefin copolymer contains diene units.
Claim 5
Dependent Claim
14 words
A composition according to claim 1 wherein said polycarbonate resin is a poly(bisphenol-A carbonate).
Claim 6
Dependent Claim
42 words
A composition according to claim 1 which also includes (d) an additive selected from a fibrous reinforcing agent; a mineral filler, a stabilizer; a mold release agent; a dye; a pigment; a flame retardant; or a mixture of any of the foregoing.
Claim 7
Dependent Claim
14 words
A composition according to claim 1 wherein the polyolefin is an ethylene-propylene diene rubber.
Claim 8
Dependent Claim
21 words
A composition according to claim 1, which includes from about 0.01 to about 0.5 percent by weight of an organic phosphite.
Claim 9
Dependent Claim
17 words
A composition according to claim 1 wherein the polyolefin copolymer consists of ethylene and propylene reaction products.
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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) | 1990-01-26 | 1990-07-28 | 1991-01-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1994-01-26 | 1994-07-28 | 1995-01-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1998-01-26 | 1998-07-28 | 1999-01-27 | $7700.00 | Window Closed / Lapsed |