US3989770A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Thermoplastic moulding compositions
Assignee: Bayer AG
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Filing: 1974-04-30
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Granted: 1976-11-02
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Expires: 1994-04-30
Abstract
Abstract Thermoplastic moulding compositions comprising 1. 5 - 95 percent by weight of polycarbonates of divalent phenols 2. 95 - 5 percent by weight of graft copolymers of A. at least one aromatic monovinyl compound B. acrylonitrile and/or its derivatives C. optionally a vinyl or allyl compound on ethylene/vinyl acetate copolymers.
Inventors
- 👤 Richard Prinz
- 👤 Salah Elabd Elghani
- 👤 Winfried Fischer
- 👤 Heinrich Alberts
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 01:21
CPC Classifications
C; C08; C08L; C08L51/00; C08L51/003; C08L51/06; C08L69/00
Claims Analysis
Total Claims: 15
Claim 1
Independent Claim
83 words
A thermoplastic molding composition comprising i. from 5 to 95 percent by weight of at least one polycarbonate derived from a divalent phenol and ii. from 95 to 5 percent by weight of at least one graft copolymer comprising a. from 10 to 70 percent by weight of an ethylene/vinyl acetate copolymer containing from 25 to 75 percent by weight of vinyl acetate having grafted thereon b. from 90 to 30 percent by weight of a copolymer prepared from a monomer mixture comprising
Claim 2
Dependent Claim
83 words
A thermoplastic molding composition comprising i. from 5 to 95 percent by weight of at least one polycarbonate derived from a divalent phenol and ii. from 95 to 5 percent by weight of at least one graft copolymer comprising a. from 10 to 70 percent by weight of an ethylene/vinyl acetate copolymer containing from 25 to 75 percent by weight of vinyl acetate having grafted thereon b. from 90 to 30 percent by weight of a copolymer prepared from a monomer mixture comprising
Claim 3
Dependent Claim
30 words
from 15 to 85 parts by weight of acrylonitrile, methacrylonitrile or a mixture thereof and 2. from 10 to 85 parts by weight of styrene, α-methylstyrene or a mixture thereof.
Claim 4
Dependent Claim
30 words
from 15 to 85 parts by weight of acrylonitrile, methacrylonitrile or a mixture thereof and 2. from 10 to 85 parts by weight of styrene, α-methylstyrene or a mixture thereof.
Claim 5
Dependent Claim
73 words
A thermoplastic molding composition as set forth in claim 1 wherein (a) is 15 to 25 percent by weight of an ethylene/vinyl acetate copolymer containing from 25 to 75 percent by weight of vinyl acetate and (b) is from 85 to 75 percent by weight of a copolymer prepared from a monomer mixture comprising from 20 to 50 parts by weight of (1) and from 80 to 50 parts by weight of (2).
Claim 6
Dependent Claim
50 words
A composition as claimed in claim 1 in which the said polycarbonate is derived from a divalent phenol selected from the group consisting of hydroquinone, resorcinol, 4,4'-dihydroxy-diphenyl, bis-(4-hydroxyphenyl)-alkanes, -cycloalkanes, -ethers, -sulphides, -sulphones or -ketones, halogen or alkyl substituted bisphenols, α,α'-bis-(p-hydroxyphenol)-p-diisopropylbenzene, bisphenol A, tetrachloro-bisphenol A, tetrabromo-bisphenol A, tetramethyl-bisphenol A and α,α'-bis-(4-hydroxyphenyl)-p-diisopropylbenzene.
Claim 7
Dependent Claim
21 words
A composition as claimed in claim 1 in which the said polycarbonate has a molecular weight of from 10,000 to 100,000.
Claim 8
Dependent Claim
18 words
A composition as claimed in claim 4 in which the said molecular weight is from 20,000 to 60,000.
Claim 9
Dependent Claim
38 words
A composition as claimed in claim 1 in which the said polycarbonate component has a relative viscosity of from 1.2 to 1.6, determined by using a solution of 0.5 g polycarbonate in 100 ml methylene chloride at 25°C.
Claim 10
Dependent Claim
21 words
A composition as claimed in claim 1 in which at least 75 percent of the said ethylene/vinyl acetate copolymer is grafted.
Claim 11
Dependent Claim
18 words
A composition as claimed in claim 7 in which the said copolymer is at least 90 percent grafted.
Claim 12
Dependent Claim
29 words
A method for preparing a composition as claimed in claim 1 comprising mixing the said components, in the required proportions, and then extruding them together through a screw extruder.
Claim 13
Dependent Claim
47 words
A method for preparing a composition as claimed in claim 1 comprising mixing solutions of the two said components in a mutual solvent and then isolating the said composition from the said solution by evaporation of the said solvent or by precipitation with at least one non-solvent.
Claim 14
Dependent Claim
16 words
A method as claimed in claim 10 in which the said solvent is chloroform or chlorobenzene.
Claim 15
Dependent Claim
17 words
A method as claimed in claim 10 in which the said non-solvent is methanol, ethanol or isopropanol.
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) | 1979-11-02 | 1980-05-03 | 1980-11-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-11-02 | 1984-05-03 | 1984-11-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-11-02 | 1988-05-03 | 1988-11-02 | $7700.00 | Window Closed / Lapsed |