Patent US5259643A successfully refreshed from Google Patents.
Patent US4046836A successfully refreshed from Google Patents.
US4046836A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Polycarbonate molding materials
Assignee: Bayer AG
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Filing: 1976-01-14
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Granted: 1977-09-06
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Expires: 1996-01-14
Abstract
Abstract This invention relates to thermoplastic polycarbonate molding materials having improved flame resistance and hydrolysis resistance. These materials comprise intimate blends of aromatic high molecular weight polycarbonates and about 0.5 to 50 wt. % of polyphenylene sulphides. This invention also relates to a process for improving the flame resistance and hydrolysis resistance of aromatic polycarbonates by intimately blending them with about 0.5 to 50 wt. % polyphenylene sulphide.
Inventors
- 👤 Siegfried Adelmann
- 👤 Dieter Margotte
- 👤 Josef Merten
- 👤 Hugo Vernaleken
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 17:42
CPC Classifications
C; C08; C08L; C08L69/00; Y; Y10; Y10S; Y10S260/00; Y10S260/24
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
48 words
Thermoplastic polycarbonate molding materials based on high molecular weight, aromatic, thermoplastic polycarbonates having molecular weights, M w , of about 10,000 to 200,000, characterized in that they contain about 0.5 - 50% by weight of a polyphenylene sulphide, based on the total weight of polycarbonate + polyphenylene sulphide.
Claim 2
Dependent Claim
48 words
Thermoplastic polycarbonate molding materials based on high molecular weight, aromatic, thermoplastic polycarbonates having molecular weights, M w , of about 10,000 to 200,000, characterized in that they contain about 0.5 - 50% by weight of a polyphenylene sulphide, based on the total weight of polycarbonate + polyphenylene sulphide.
Claim 3
Dependent Claim
23 words
Molding materials according to claim 1, characterized in that the polyphenylene sulphide content is between about 2% by weight and 20% by weight.
Claim 4
Dependent Claim
23 words
Molding materials according to claim 1, characterized in that the polyphenylene sulphide content is between about 5% by weight and 10% by weight.
Claim 5
Dependent Claim
26 words
Thermoplastic molding materials according to claim 1, characterized in that aromatic polycarbonates based on 2,2-bis-(4-hydroxyphenyl)-propane (bisphenol A), 2,2-bis-(3,5-dibromo-4-hydroxyphenyl)-propane (tetrabromobisphenol A) and 2,2-bis-(3,5-dimethyl-4-hydroxyphenyl)-propane (tetramethylbisphenol A) are used.
Claim 6
Dependent Claim
18 words
Thermoplastic molding materials according to claim 1, characterized in that poly-1,4-phenylene sulphide with unsubstituted 1,4-phenylene groups is used.
Claim 7
Dependent Claim
62 words
A thermoplastic molding material comprising an intimate blend of a. an aromatic thermoplastic polycarbonate having a molecular weight, M w , of between about 10,000 and 200,000, and b. about 0.5 to 50 wt.% based on the total weight of the material of polyphenylene sulphide based on unsubstituted 1,4-phenylene and having a glass transition temperature of between about 85° and 95° C.
Claim 8
Dependent Claim
62 words
A thermoplastic molding material comprising an intimate blend of a. an aromatic thermoplastic polycarbonate having a molecular weight, M w , of between about 10,000 and 200,000, and b. about 0.5 to 50 wt.% based on the total weight of the material of polyphenylene sulphide based on unsubstituted 1,4-phenylene and having a glass transition temperature of between about 85° and 95° C.
Claim 9
Dependent Claim
21 words
The material of claim 6, wherein the polycarbonate has a molecular weight, M w , of between about 20,000 and 80,000.
Claim 10
Dependent Claim
24 words
The material of claim 7, wherein the polycarbonate is based on monomers 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.
Claim 11
Dependent Claim
17 words
The material of claim 8, wherein the polycarbonate is based on at least about 70 mol% 2,2-bis-(4-hydroxyphenyl)-propane.
Claim 12
Dependent Claim
40 words
A process for improving the flame resistance and hydrolysis resistance of thermoplastic aromatic polycarbonates having molecular weights, M w , of between about 10,000 and 200,000 comprising intimately blending said polycarbonates with about 0.5 to 50 wt.% of polyphenylene sulphide.
Claim 13
Dependent Claim
40 words
A process for improving the flame resistance and hydrolysis resistance of thermoplastic aromatic polycarbonates having molecular weights, M w , of between about 10,000 and 200,000 comprising intimately blending said polycarbonates with about 0.5 to 50 wt.% of polyphenylene sulphide.
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) | 1980-09-05 | 1981-03-07 | 1981-09-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-09-05 | 1985-03-07 | 1985-09-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-09-05 | 1989-03-07 | 1989-09-06 | $7700.00 | Window Closed / Lapsed |