US4407995A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Stabilized polycarbonate compositions containing cyclic carbonates and organophosphorous compounds
Assignee: Dow Chemical Co
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Filing: 1982-07-28
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Granted: 1983-10-04
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Expires: 2002-07-28
Abstract
Abstract Polycarbonates are heat stabilized by the incorporation of a carbonate compound having a boiling point greater than about 250° C. and an organophosphorous compound such as a phosphonite or a phosphite. The amount of the additive compound used in each instance is from 100 to 10,000 parts per million.
Inventors
- 👤 Kevin F. Dick
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 15:41
CPC Classifications
C; C08; C08K; C08K5/00; C08K5/49; C08K5/51; C08K5/52; C08K5/524; C08K5/04; C08K5/15; C08K5/156; C08K5/53; C08K5/5317; C08K5/5333
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
53 words
A heat stabilized aromatic polycarbonate composition resistant to yellowing which comprises an aromatic polycarbonate blended with 100 to 10,000 parts per million of a cyclic carbonate compound having a boiling point greater than about 250° C. and 100 to 10,000 parts per million of an organophosphorous compound selected from neutral phosphites and phosphonites.
Claim 2
Dependent Claim
53 words
A heat stabilized aromatic polycarbonate composition resistant to yellowing which comprises an aromatic polycarbonate blended with 100 to 10,000 parts per million of a cyclic carbonate compound having a boiling point greater than about 250° C. and 100 to 10,000 parts per million of an organophosphorous compound selected from neutral phosphites and phosphonites.
Claim 3
Dependent Claim
22 words
The composition as set forth in claim 1 wherin the amount of carbonate compound ranges from 1000 to 3,000 parts per million.
Claim 4
Dependent Claim
22 words
The composition as set forth in claim 1 wherein the amount of organophosphorous compound ranges from 500 to 3,000 parts per million.
Claim 5
Dependent Claim
44 words
The composition as set forth in claim 1 wherein the carbonate compound is selected from the group consisting of (a) organic compounds having a single carbonate group, (b) organic compounds having two carbonate groups, or (c) organic compounds having three or more carbonate groups.
Claim 6
Dependent Claim
14 words
The composition as set forth in claim 1 wherein the carbonato compound is 1,2-carbonate-3-toloxypropane.
Claim 7
Dependent Claim
16 words
The composition as set forth in claim 1 wherein the carbonate compound is 3,3'-isopropylidene bis(p-phenyleneoxy)di-1,2-carbonato propane.
Claim 8
Dependent Claim
16 words
The composition as set forth in claim 1 wherein the carbonato compound is 3,4-carbonato cyclohexylmethyl-3,4-carbonato-cyclohexane carboxylate.
Claim 9
Dependent Claim
16 words
The composition as set forth in claim 1 wherein the organophosphorous compound is tetrakis (2,4-ditertiarybutylphenyl)4,4'-biphenylylene diphosphonite.
Claim 10
Dependent Claim
14 words
The composition as set forth in claim 1 wherein the organophosphorous compound is tris(2,4-di-tertiary-butylphenyl)phosphite.
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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) | 1986-10-03 | 1987-04-04 | 1987-10-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1990-10-03 | 1991-04-04 | 1991-10-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1994-10-03 | 1995-04-04 | 1995-10-04 | $7700.00 | Window Closed / Lapsed |