US4425456A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Copolycarbonates based on bis(4-hydroxyphenyl)biphenyl disulfone
Assignee: Bayer Corp
•
Filing: 1981-09-28
•
Granted: 1984-01-10
•
Expires: 2001-09-28
Abstract
Abstract A copolycarbonate molding composition comprising the reaction product of an aromatic diphenol, a bis(4-hydroxyphenyl)biphenyl disulfone and a carbonate source is characterized by its high glass transition temperature. A blend thereof containing an organic acid salt is characterized by its improved flame retardance.
Inventors
- 👤 Arthur L. Baron
- 👤 Sivaram Krishnan
- 👤 Mark W. Witman
- 👤 Roger J. White
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 22:45
CPC Classifications
C; C08; C08G; C08G64/00; C08G64/04; C08G64/06; C08G64/08; C08G64/081; C08K; C08K5/00; C08K5/36; C08K5/41
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
55 words
An aromatic copolycarbonate molding composition comprising structural units derived from (i) bis(4-hydroxyphenyl)biphenyl disulfone and (ii) at least one other aromatic diphenol selected from the group consisting of 2,2-bis-(4-hydroxyphenyl)-propane, 2,2-bis-(3,5-dimethyl-4-hydroxyphenyl)-propane, 2,2-bis-(3,5-dichloro-4-hydroxyphenyl)-propane, 2,2-bis-(3,5-dibromo-4-hydroxyphenyl)-propane and 1,1-bis-(4-hydroxyphenyl)-cyclohexane, and (iii) a member selected from the group consisting of carbonyl bromide, phosgene, bischloroformic esters of (i) or (ii) and diaryl carbonate.
Claim 2
Dependent Claim
55 words
An aromatic copolycarbonate molding composition comprising structural units derived from (i) bis(4-hydroxyphenyl)biphenyl disulfone and (ii) at least one other aromatic diphenol selected from the group consisting of 2,2-bis-(4-hydroxyphenyl)-propane, 2,2-bis-(3,5-dimethyl-4-hydroxyphenyl)-propane, 2,2-bis-(3,5-dichloro-4-hydroxyphenyl)-propane, 2,2-bis-(3,5-dibromo-4-hydroxyphenyl)-propane and 1,1-bis-(4-hydroxyphenyl)-cyclohexane, and (iii) a member selected from the group consisting of carbonyl bromide, phosgene, bischloroformic esters of (i) or (ii) and diaryl carbonate.
Claim 3
Dependent Claim
50 words
The aromatic copolycarbonate of claim 1 wherein said bis(4-hydroxyphenyl)biphenyl disulfone is of the structural formula: ##STR4## wherein R 1 , R 2 , R 3 and R 4 independently are H, C 1 -C 4 -alkyl, Cl or Br, and n 1 to n 4 independently denote 0 to 4.
Claim 4
Dependent Claim
17 words
The aromatic copolycarbonate of claim 2 wherein said bis(4-hydroxyphenyl) biphenyl disulfone is of the structural formula ##STR5##
Claim 5
Dependent Claim
30 words
The aromatic copolycarbonate of claim 1 wherein said bis(4-hydroxyphenyl)biphenyl disulfone is present at a level of about 0.1 to 60 wt. %, based on the total weight of dihydroxy compounds.
Claim 6
Dependent Claim
30 words
The aromatic copolycarbonate of claim 4 wherein sad bis(4-hydroxyphenyl)biphenyl disulfone is present at a level of about 0.5 to 20 wt. %, based on the total weight of dihydroxy compounds.
Claim 7
Dependent Claim
85 words
A thermoplastic aromatic polycarbonate molding composition comprising a blend of (i) the product of a reaction comprising (a) at least one aromatic diphenol selected from the group consisting of 2,2-bis-(4-hydroxyphenyl)-propane, 2,2-bis-(3,5-dimethyl-4-hydroxyphenyl)-propane, 2,2-bis-(3,5-dichloro-4-hydroxyphenyl)-propane, 2,2-bis-(3,5-dibromo-4-hydroxyphenyl)-propane and 1,1-bis-(4-hydroxyphenyl)-cyclohexane, (b) bis(4-hydroxyphenyl)biphenyl disulfone and (c) a member selected from the group consisting of carbonyl bromide, phosgene, bischloroformic esters of (a) or (b) and diaryl carbonates and (ii) about 0.1 to 1 percent of an organic acid salt, said percent being relative to the weight of said product of a reaction.
Claim 8
Dependent Claim
85 words
A thermoplastic aromatic polycarbonate molding composition comprising a blend of (i) the product of a reaction comprising (a) at least one aromatic diphenol selected from the group consisting of 2,2-bis-(4-hydroxyphenyl)-propane, 2,2-bis-(3,5-dimethyl-4-hydroxyphenyl)-propane, 2,2-bis-(3,5-dichloro-4-hydroxyphenyl)-propane, 2,2-bis-(3,5-dibromo-4-hydroxyphenyl)-propane and 1,1-bis-(4-hydroxyphenyl)-cyclohexane, (b) bis(4-hydroxyphenyl)biphenyl disulfone and (c) a member selected from the group consisting of carbonyl bromide, phosgene, bischloroformic esters of (a) or (b) and diaryl carbonates and (ii) about 0.1 to 1 percent of an organic acid salt, said percent being relative to the weight of said product of a reaction.
Claim 9
Dependent Claim
27 words
The aromatic polycarbonate molding composition of claim 6 wherein the organic acid salt is selected from the group consisting of sodium perfluorobutane sulfonate and potassium perfluorobutane sulfonate.
Claim 10
Dependent Claim
39 words
The aromatic polycarbonate molding composition of claim 6 intimately blended with a sufficient amount of a halogen-containing compound to produce a composition containing about 0.01 to 7 wt. % of halogen, based on the weight of the aromatic polycarbonate.
Claim 11
Dependent Claim
13 words
The aromatic polycarbonate molding composition of claim 8 wherein said halogen is bromine.
References Cited (Backward Citations)
US2970131A
Cited
US3028365A
Cited
US3153008A
Cited
US2964794A
Cited
US3269986A
Cited
US3775367A
Cited
US3836490A
Cited
US3912688A
Cited
US4303776A
Cited
US4306055A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1987-01-09 | 1987-07-11 | 1988-01-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1991-01-09 | 1991-07-11 | 1992-01-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1995-01-09 | 1995-07-11 | 1996-01-10 | $7700.00 | Window Closed / Lapsed |