Patent US3731028A successfully refreshed from Google Patents.
Patent US3880799A successfully refreshed from Google Patents.
US3880799A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Thermal oxidatively stable polycarbonate
Assignee: General Electric Co
•
Filing: 1974-01-02
•
Granted: 1975-04-29
•
Expires: 1994-01-02
Abstract
Abstract A thermal oxidatively stable polycarbonate composition having a stabilizing amount of an ester of a phosphorohalidous acid and a process for preparing a thermal oxidatively stable polymer. In the process, the ester of a phosphorohalidous acid is reacted with a dihydric-phenol monomer. In addition, an epoxy may be used in admixture with the composition.
Inventors
- 👤 Thomas J Hoogeboom
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 23:37
CPC Classifications
C; C08; C08G; C08G64/00; C08K; C08K5/00; C08K5/04; C08K5/15; C08L; C08L63/00; C08L69/00
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
43 words
A THERMAL OXIDATIVELY STABLE POLYMER COMPOSITION WHICH IS THE RESIDUE OF THE CONDENSATION REACTION OF A DIHYDRIC PHENOL, A CARBONATE PRECURSOR AND 0.00015 TO ABOUT 0.05 MOLES PER MOLE OF DIHYDRIC PHENOL OF AN ESTER OF A PHOSPHOROHALIDOUS ACID HAVING THE FOLLOWING FORMULA:
Claim 2
Dependent Claim
43 words
A THERMAL OXIDATIVELY STABLE POLYMER COMPOSITION WHICH IS THE RESIDUE OF THE CONDENSATION REACTION OF A DIHYDRIC PHENOL, A CARBONATE PRECURSOR AND 0.00015 TO ABOUT 0.05 MOLES PER MOLE OF DIHYDRIC PHENOL OF AN ESTER OF A PHOSPHOROHALIDOUS ACID HAVING THE FOLLOWING FORMULA:
Claim 3
Dependent Claim
14 words
The composition of claim 1 wherein the ester of phosphorohalidous acid is diphenyl phosphorochloridite.
Claim 4
Dependent Claim
13 words
The composition of claim 1 wherein the polymer composition has the following formula:
Claim 5
Dependent Claim
63 words
In a process for preparing a thermal oxidatively stable aromatic polycarbonate by reacting a dihydric phenol with a carbonate precursor in the presence of an acid acceptor, a catalyst and a molecular weight regulator; wherein the improvement comprises adding to the reaction 0.000015 to about 0.05 mole per mole of dihydric phenol of an ester of a phosphorohalidous acid having the following formula:
Claim 6
Dependent Claim
63 words
In a process for preparing a thermal oxidatively stable aromatic polycarbonate by reacting a dihydric phenol with a carbonate precursor in the presence of an acid acceptor, a catalyst and a molecular weight regulator; wherein the improvement comprises adding to the reaction 0.000015 to about 0.05 mole per mole of dihydric phenol of an ester of a phosphorohalidous acid having the following formula:
Claim 7
Dependent Claim
32 words
The composition of claim 1 having in admixture therewith from 0.01 to 1.0 weight percent based on the weight of the polymer composition of an epoxy composition represented by the following formula:
Claim 8
Dependent Claim
14 words
The composition of claim 4 wherein the epoxy compound is an epoxidized cycloaliphatic compound.
Claim 9
Dependent Claim
14 words
The composition of claim 4 wherein the epoxy compound is 3,4-epoxy-cyclohexylmethyl 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) | 1978-04-28 | 1978-10-28 | 1979-04-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-04-28 | 1982-10-28 | 1983-04-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-04-28 | 1986-10-28 | 1987-04-29 | $7700.00 | Window Closed / Lapsed |