Patent US4461877A successfully refreshed from Google Patents.
US4461877A
Expired / Lapsed
US
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Polycarbonate/poly(ethylene terephthalate) resin solutions
Assignee: General Electric Co
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Filing: 1982-12-06
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Granted: 1984-07-24
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Expires: 2002-12-06
Abstract
Abstract Thermoplastic compositions which are a solution of polycarbonate and poly(ethylene terephthalate) resins are described. These solutions are produced by melt admixture of a polycarbonate prepared from bis(3,5,dimethyl-4-hydroxy phenyl) sulfone and 2,2-bis(4-hydroxy-phenyl) propane and polyethylene terephthalate) to provide the composition with a single glass transition point.
Inventors
- 👤 Daniel W. Fox
- 👤 Edward N. Peters
- 👤 Gary F. Smith
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 11:39
CPC Classifications
C; C08; C08L; C08L67/00; C08L67/02; C08L69/00
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
69 words
A thermoplastic composition comprising (1) from about 20 to about 80 percent by total resin weight of a polycarbonate resin containing units derived from diphenyl sulfone monomer and units derived from hydrocarbon bisphenol and (2) from about 80 to about 20 percent by total resin weight of poly (ethylene terephthalate) resin, said resins having been prepared by melt mixing, to provide said composition with a single glass transition point.
Claim 2
Dependent Claim
69 words
A thermoplastic composition comprising (1) from about 20 to about 80 percent by total resin weight of a polycarbonate resin containing units derived from diphenyl sulfone monomer and units derived from hydrocarbon bisphenol and (2) from about 80 to about 20 percent by total resin weight of poly (ethylene terephthalate) resin, said resins having been prepared by melt mixing, to provide said composition with a single glass transition point.
Claim 3
Dependent Claim
24 words
The composition of claim 1, wherein the diphenyl sulfone and hydrocarbon bisphenol units are in a mole ratio of from about 1:5 to 5:1.
Claim 4
Dependent Claim
12 words
The composition of claim 2, wherein the hydrocarbon bisphenol is 2,2-bis(4-hydroxyphenyl) propane.
Claim 5
Dependent Claim
12 words
The composition of claim 1, wherein the diphenyl sulfone is bis-(3,5-dimethyl-4-hydroxyphenyl) sulfone.
Claim 6
Dependent Claim
87 words
A thermoplastic composition comprising: (a) from about 20 to about 80 percent by total resin weight of a carbonate copolymer resin containing units derived from bis(3,5-dimethyl-4-hydroxyphenyl) sulfone and units derived from 2,2-bis(4-hydroxyphenyl) propane, the mole ratio of said sulfone units to said 2,2-bis(4-hydroxyphenyl) propane units being from about 1:5 to 5:1 respectively; and (b) from about 80 to about 20 percent by total resin weight of poly(ethylene terephthalate) resin, said resins having been prepared by melt mixing to provide said composition with a single glass transition point.
Claim 7
Dependent Claim
87 words
A thermoplastic composition comprising: (a) from about 20 to about 80 percent by total resin weight of a carbonate copolymer resin containing units derived from bis(3,5-dimethyl-4-hydroxyphenyl) sulfone and units derived from 2,2-bis(4-hydroxyphenyl) propane, the mole ratio of said sulfone units to said 2,2-bis(4-hydroxyphenyl) propane units being from about 1:5 to 5:1 respectively; and (b) from about 80 to about 20 percent by total resin weight of poly(ethylene terephthalate) resin, said resins having been prepared by melt mixing to provide said composition with a single glass transition point.
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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) | 1987-07-24 | 1988-01-23 | 1988-07-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1991-07-24 | 1992-01-23 | 1992-07-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1995-07-24 | 1996-01-23 | 1996-07-24 | $7700.00 | Window Closed / Lapsed |