US4473685A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Flame retardant non-dripping polycarbonate compositions exhibiting improved thick section impact
Assignee: General Electric Co
•
Filing: 1983-07-28
•
Granted: 1984-09-25
•
Expires: 2003-07-28
Abstract
Abstract Flame retardant, non-dripping polycarbonate compositions exhibiting good thick section impact comprised of, in admixture: (i) a minor amount of a fluorinated polyolefin; and (ii) a carbonate copolymer based on the reaction products of (a) a carbonate precursor, (b) at least one halogen-free and sulfur free dihydric phenol, and (c) at least one halogen-free thiodiphenol.
Inventors
- 👤 Victor Mark
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 01:33
CPC Classifications
C; C08; C08L; C08L69/00; Y; Y10; Y10S; Y10S260/00; Y10S260/24
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
84 words
Flame retardant substantially nondripping polycarbonate compositions exhibiting good thick section impact comprised of, in admixture: (i) at least one polycarbonate resin derived from (a) a carbonate precursor (b) at least one halogen-free and sulfur-free dihydric phenol, and (c) from about 1 to about 15 mole percent, based on the amount of said dihydric phenol, of at least one halogen-free thidoiphenol; and (ii) from about 0.01 to about 1 weight percent, based on the amount of said polycarbonate resin, of at least one fluorinated polyolefin.
Claim 2
Dependent Claim
84 words
Flame retardant substantially nondripping polycarbonate compositions exhibiting good thick section impact comprised of, in admixture: (i) at least one polycarbonate resin derived from (a) a carbonate precursor (b) at least one halogen-free and sulfur-free dihydric phenol, and (c) from about 1 to about 15 mole percent, based on the amount of said dihydric phenol, of at least one halogen-free thidoiphenol; and (ii) from about 0.01 to about 1 weight percent, based on the amount of said polycarbonate resin, of at least one fluorinated polyolefin.
Claim 3
Dependent Claim
21 words
The compositions of claim 1 wherein said amount of said fluorinated polyolefin is from about 0.01 to about 0.5 weight percent.
Claim 4
Dependent Claim
20 words
The compositions of claim 1 wherein said amount of said thiodiphenol is from about 1 to about 10 mole percent.
Claim 5
Dependent Claim
63 words
The compositions of claim 1 wherein said halogen-free and sulfur-free dihydric phenol is represented by the formula ##STR6## wherein: A is selected from divalent hydrocarbon radicals, the --O-- radical, and the ##STR7## radical; R is independently selected from monovalent hydrocarbon radicals; n is independently selected from whole numbers having a value of from 0 to 4 inclusive; and y is one or zero.
Claim 6
Dependent Claim
22 words
The compositions of claim 4 wherein said divalent hydrocarbon radicals represented by A are selected from alkylene, alkylidene, cycloalkylene, and cycloalkylidene radicals.
Claim 7
Dependent Claim
22 words
The compositions of claim 4 wherein said monovalent hydrocarbon radicals represented by R are selected from alkyl, aryl, alkaryl, and aralkyl radicals.
Claim 8
Dependent Claim
13 words
The compositions of claim 6 wherein R is independently selected from alkyl radicals.
Claim 9
Dependent Claim
45 words
The compositions of claim 1 wherein said thiodiphenol is represented by the general formula ##STR8## wherein: R 2 is independently selected from alkyl, aryl, aralkyl, and alkaryl radicals; and m is independently selected from whole numbers having a value of from 0 to 4 inclusive.
Claim 10
Dependent Claim
14 words
The compositions of claim 8 wherein R 2 is independently selected from alkyl radicals.
Claim 11
Dependent Claim
27 words
The compositions of claim 1 which further contain at least one polycarbonate resin derived from (a) a carbonate precursor, and (b) a halogen-free and sulfur-free dihydric phenol.
Claim 12
Dependent Claim
35 words
The compositions of claim 10 wherein said halogen-free and sulfur-free polycarbonate resin is present in an amount of from about 20 to about 80 weight percent, based on the total amount of polycarbonate resins present.
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) | 1987-09-25 | 1988-03-26 | 1988-09-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1991-09-25 | 1992-03-26 | 1992-09-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1995-09-25 | 1996-03-26 | 1996-09-25 | $7700.00 | Window Closed / Lapsed |