US3859248A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Thermal oxidatively stable polycarbonate composition
Assignee: General Electric Co
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Filing: 1974-06-17
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Granted: 1975-01-07
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Expires: 1994-06-17
Abstract
Abstract A thermal oxidatively stable polycarbonate composition consisting of the reaction product of bisphenol-A, a carbonate precursor and a minor amount of phosphorus dihalide, the composition having in admixture therewith a particular epoxidized composition in an amount of 0.01 to about 1.0 weight percent wherein the epoxy composition may be an epoxidized cycloaliphatic compound. The formula of the epoxy composition is as follows:
Inventors
- 👤 Charles A Bialous
- 👤 Donald B G Jaquiss
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 19:15
CPC Classifications
C; C08; C08K; C08K5/00; C08K5/04; C08K5/15; C08K5/151; C08K5/1515; C08G; C08G64/00; C08G64/04; C08G64/06; C08G64/08; C08G64/083; C08G64/14; C08K5/49
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
38 words
A THERMAL OXIDATIVELY STABLE POLYCARBONATE COMPOSITION WHICH IS THE RESIDUE OF THE CONDENSATION REACTION OF 2.2-BIS (4-HYDROXYPHENYL) PROPANE, A CARBONATE PRECURSOR AND 0.0005 TO ABOUT 0.01 MOLE PER MOLE OF BISPHENOL-A OF A PHOSPHORUS DIHALIDE OF THE FORMULA.
Claim 2
Dependent Claim
38 words
A THERMAL OXIDATIVELY STABLE POLYCARBONATE COMPOSITION WHICH IS THE RESIDUE OF THE CONDENSATION REACTION OF 2.2-BIS (4-HYDROXYPHENYL) PROPANE, A CARBONATE PRECURSOR AND 0.0005 TO ABOUT 0.01 MOLE PER MOLE OF BISPHENOL-A OF A PHOSPHORUS DIHALIDE OF THE FORMULA.
Claim 3
Dependent Claim
13 words
The composition of claim 1 wherein the phosphorus dihalide is phenyl phosphorus dihalide.
Claim 4
Dependent Claim
14 words
The composition of claim 1 wherein the epoxy compound is an epoxidized cycloaliphatic compound.
Claim 5
Dependent Claim
14 words
The composition of claim 1 wherein the epoxy compound is 3,4-epoxycyclohexylmethyl 3,4-epoxy cyclohexane carboxylate.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-01-06 | 1978-07-08 | 1979-01-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-01-06 | 1982-07-08 | 1983-01-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-01-06 | 1986-07-08 | 1987-01-07 | $7700.00 | Window Closed / Lapsed |