US4254014A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Polycarbonate containing a bis(cyclic phosphite) as a thermal stabilizer
Assignee: Dow Chemical Co
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Filing: 1979-08-27
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Granted: 1981-03-03
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Expires: 1999-08-27
Abstract
Abstract A polycarbonate such as a bisphenol-A homopolycarbonate containing a small amount of an aromatic bis(cyclic phosphite) such as 2,2'--(1-methylethylidene)bis(4,1-phenyleneoxy-2,1-ethanediyloxy)]bis( 5,5-dimethyl-1,3,2-dioxaphosphorinane) exhibits improved processability and thermal stability.
Inventors
- 👤 Gerald K. McEwen
- 👤 Lowell S. Thomas
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 21:31
CPC Classifications
C; C07; C07F; C07F9/00; C07F9/02; C07F9/547; C07F9/6564; C07F9/6571; C07F9/6574; C07F9/65746; C08; C08K; C08K5/00; C08K5/49; C08K5/51; C08K5/52; C08K5/527
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
52 words
An aromatic bis(dioxaphosphorinane) represented by the formula: ##STR8## wherein Ar is a divalent aromatic radical having each of its valences on an aromatic ring; each R is individually a divalent aliphatic radical and each R' is individually hydrogen or a monovalent organic radical provided that the aromatic bis(dioxaphosphorinane) is inert to polycarbonates.
Claim 2
Dependent Claim
52 words
An aromatic bis(dioxaphosphorinane) represented by the formula: ##STR8## wherein Ar is a divalent aromatic radical having each of its valences on an aromatic ring; each R is individually a divalent aliphatic radical and each R' is individually hydrogen or a monovalent organic radical provided that the aromatic bis(dioxaphosphorinane) is inert to polycarbonates.
Claim 3
Dependent Claim
8 words
The bis(dioxaphosphorinane) of claim 1 which is 2,2'--(1-methylethylidene)bis(4,1-phenyleneoxy-2,1-ethanediyloxy)]bis(5,5-dimethyl-1,3,2-dioxaphosphorinane.
Claim 4
Dependent Claim
32 words
A polycarbonate composition comprising a carbonate polymer having dispersed therein the aromatic bis(dioxaphosphorinane) of claim 1 in an amount sufficient to measurably increase the thermal stability or processability of the carbonate polymer.
Claim 5
Dependent Claim
29 words
The composition of claim 3 wherein the amount is in the range from about 0.05 to 1 weight percent of bis(dioxaphosphorinane) based on the weight of the carbonate polymer.
Claim 6
Dependent Claim
25 words
The composition of claims 3 or 4 wherein the bis(dioxaphosphorinane) is as defined in claim 2 and the carbonate polymer is a homopolycarbonate of bisphenol-A.
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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) | 1984-03-02 | 1984-09-01 | 1985-03-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1988-03-02 | 1988-09-01 | 1989-03-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1992-03-02 | 1992-09-01 | 1993-03-03 | $7700.00 | Window Closed / Lapsed |