US4260732A
Expired / Lapsed
US
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UV Stabilized polycarbonate resins
Assignee: General Electric Co
•
Filing: 1980-02-22
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Granted: 1981-04-07
•
Expires: 2000-02-22
Abstract
Abstract UV stabilizing units are incorporated in a polycarbonate molecule to impart UV stability to the polycarbonate.
Inventors
- 👤 Ta-Yen Ching
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 16:41
CPC Classifications
C; C08; C08G; C08G63/00; C08G63/64
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
125 words
An aryl polycarbonate resin having good stability to UV light where the said resin comprises aryl carbonate units of the formula, ##STR13## and formate units of the formula, ##STR14## where the Y's are independently selected from the class consisting of hydrogen, alkyl groups containing from 1 to 3 carbon atoms, R 1 and R 2 are independently selected from the class consisting of hydrogen, alkyl radicals of from 1 to 3 carbon atoms, and phenyl radical, X is a divalent saturated C 2 -C 10 alkylene radical, and m and n are integers of from 1 to 2, inclusive, where the molar concentration of the formate unit ranges from 0.1 to 25 mol percent, based on the total molar concentration of the two aforesaid units.
Claim 2
Dependent Claim
125 words
An aryl polycarbonate resin having good stability to UV light where the said resin comprises aryl carbonate units of the formula, ##STR13## and formate units of the formula, ##STR14## where the Y's are independently selected from the class consisting of hydrogen, alkyl groups containing from 1 to 3 carbon atoms, R 1 and R 2 are independently selected from the class consisting of hydrogen, alkyl radicals of from 1 to 3 carbon atoms, and phenyl radical, X is a divalent saturated C 2 -C 10 alkylene radical, and m and n are integers of from 1 to 2, inclusive, where the molar concentration of the formate unit ranges from 0.1 to 25 mol percent, based on the total molar concentration of the two aforesaid units.
Claim 3
Dependent Claim
14 words
The composition as in claim 1, wherein X is --CH 2 --CH 2 --.
Claim 4
Dependent Claim
18 words
The composition as in claim 1, wherein X is --CH 2 --C(CH 3 ) 2 --CH 2 --.
Claim 5
Dependent Claim
18 words
The composition as in claim 1, wherein X is --CH 2 --(CH 2 ) 2 --CH 2 --.
Claim 6
Dependent Claim
19 words
The composition as in claim 1, where Y is hydrogen and R 1 and R 2 are methyl radicals.
Claim 7
Dependent Claim
18 words
The composition as in claim 1, wherein X is --CH 2 --C(CH 3 ) 2 --CH 2 --.
Claim 8
Dependent Claim
25 words
The composition as in claim 1 where X is --CH 2 CH 2 --, Y is hydrogen and R 1 and R 2 are methyl.
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) | 1984-04-06 | 1984-10-06 | 1985-04-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1988-04-06 | 1988-10-06 | 1989-04-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1992-04-06 | 1992-10-06 | 1993-04-07 | $7700.00 | Window Closed / Lapsed |