US4097547A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Stabilized polycarbonates
Assignee: Bayer Corp
•
Filing: 1972-12-26
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Granted: 1978-06-27
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Expires: 1992-12-26
Abstract
Abstract Halogenated polycarbonate polymeric materials containing an effective amount of barium carbonate, strontium carbonate and/or calcium carbonate to stabilize the polymer.
Inventors
- 👤 Thomas H. Cleveland
- 👤 John V. Bailey
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 00:23
CPC Classifications
C; C08; C08K; C08K3/00; C08K3/18; C08K3/24; C08K3/26; C08K5/00; C08K5/49; C08K5/51; C08K5/52; C08K5/524
Claims Analysis
Total Claims: 14
Claim 1
Independent Claim
136 words
A polycarbonate composition comprising in admixture an aromatic polycarbonate of a dihydric phenol and a carbonate precursor and 0.01 to about 5.0 weight percent, based on the total weight of the polycarbonate composition, of an alkaline earth carbonate selected from the group consisting of barium carbonate, strontium carbonate, and calcium carbonate; said aromatic polycarbonate being selected from the group consisting of (a) a polycarbonate of a halogen substituted dihydric phenol, (b) a copolycarbonate of an unsubstituted dihydric phenol and a halogen substituted dihydric phenol, (c) mixtures of (a) and (b) and (d) mixtures of a member selected from the group consisting of (a) and (b) with a polycarbonate of an unsubstituted dihydric phenol; said halogen being selected from the group consisting of bromine and chlorine and being a substituent on the aromatic hydroxyl bearing phenyl moiety.
Claim 2
Dependent Claim
136 words
A polycarbonate composition comprising in admixture an aromatic polycarbonate of a dihydric phenol and a carbonate precursor and 0.01 to about 5.0 weight percent, based on the total weight of the polycarbonate composition, of an alkaline earth carbonate selected from the group consisting of barium carbonate, strontium carbonate, and calcium carbonate; said aromatic polycarbonate being selected from the group consisting of (a) a polycarbonate of a halogen substituted dihydric phenol, (b) a copolycarbonate of an unsubstituted dihydric phenol and a halogen substituted dihydric phenol, (c) mixtures of (a) and (b) and (d) mixtures of a member selected from the group consisting of (a) and (b) with a polycarbonate of an unsubstituted dihydric phenol; said halogen being selected from the group consisting of bromine and chlorine and being a substituent on the aromatic hydroxyl bearing phenyl moiety.
Claim 3
Dependent Claim
43 words
The composition of claim 1 wherein the aromatic polycarbonate is a mixture of a polycarbonate of a dihydric phenol and a copolycarbonate of a dihydric phenol and a tetrahalogenated dihydric phenol said halogen being selected from the group consisting of bromine and chlorine.
Claim 4
Dependent Claim
17 words
The composition of claim 1 wherein the aromatic polycarbonate is a copolycarbonate of bisphenol-A and tetrabromo bisphenol-A.
Claim 5
Dependent Claim
15 words
The composition of claim 1 wherein the aromatic polycarbonate is a polycarbonate of tetrabromo bisphenol-A.
Claim 6
Dependent Claim
13 words
The composition of claim 1 wherein the alkaline earth carbonate is barium carbonate.
Claim 7
Dependent Claim
10 words
The composition of claim 1 wherein the halogen is chlorine.
Claim 8
Dependent Claim
30 words
The composition of claim 6 wherein the aromatic polycarbonate is a mixture of polycarbonate of a dihydric phenol and a copolycarbonate of a dihydric phenol and a tetrachlorinated dihydric phenol.
Claim 9
Dependent Claim
17 words
The composition of claim 7 wherein the dihydric phenol is 2,2-bis(4-hydroxyphenyl)-propane and the tetrachlorinated phenol is 2,2-bis(3,5-dichloro-4-hydroxyphenyl)-propane.
Claim 10
Dependent Claim
10 words
The composition of claim 1 wherein the halogen is bromine.
Claim 11
Dependent Claim
30 words
The composition of claim 9 wherein the aromatic polycarbonate is a mixture of polycarbonate of a dihydric phenol and a copolycarbonate of a tetrabrominated dihydric phenol and a dihydric phenol.
Claim 12
Dependent Claim
18 words
The composition of claim 10 wherein the dihydric phenol is 2,2-bis(4-hydroxyphenyl)-propane and the tetrabrominated dihydric phenol is 2,2-(3,5-dibromo-4-hydroxyphenyl)-propane.
Claim 13
Dependent Claim
37 words
A polycarbonate composition comprising a mixture of the polycarbonate homopolymer of 2,2-bis(4-hydroxyphenyl)-propane and the polycarbonate copolymer of 2,2-bis(4-hydroxyphenyl)-propane and 2,2-bis(3,5-dibromo-4-hydroxyphenyl)-propane, said mixture containing 0.01 to 5 weight percent, based on the weight of polycarbonate, of barium carbonate.
Claim 14
Dependent Claim
37 words
A polycarbonate composition comprising a mixture of the polycarbonate homopolymer of 2,2-bis(4-hydroxyphenyl)-propane and the polycarbonate copolymer of 2,2-bis(4-hydroxyphenyl)-propane and 2,2-bis(3,5-dibromo-4-hydroxyphenyl)-propane, said mixture containing 0.01 to 5 weight percent, based on the weight of polycarbonate, of barium carbonate.
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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) | 1981-06-26 | 1981-12-26 | 1982-06-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1985-06-26 | 1985-12-26 | 1986-06-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1989-06-26 | 1989-12-26 | 1990-06-27 | $7700.00 | Window Closed / Lapsed |