US4393172A
Expired / Lapsed
US
⏱️ 0.0 years remaining
High-notched-impact core-shell polymers having improved weather resistance
Assignee: Bayer AG
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Filing: 1981-10-08
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Granted: 1983-07-12
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Expires: 2001-10-08
Abstract
Abstract A particulate graft polymer comprising (a) a core formed by a crosslinked homopolymer of a conjugated diene or a copolymer thereof with up to 10% by weight of styrene or acrylonitrile; (b) a first shell formed by a crosslinked homopolymer of an acrylic acid alkyl ester or a copolymer thereof with up to 30% by weight of vinyl monomers; (c) a second shell formed by a polymer of resin-forming monomers, a process for manufacturing these graft polymers by means of a multi-stage emulsion polymerization, and their application as molding compositions, optionally together with rigid thermoplastic resins.
Inventors
- 👤 Christian Lindner
- 👤 Karl-Heinz Ott
- 👤 Alfred Pischtschan
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 22:58
CPC Classifications
C; C08; C08F; C08F279/00; C08F279/02; Y; Y10; Y10S; Y10S525/00; Y10S525/902
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
118 words
Particulate graft polymer comprising (a) a core which is a crosslinked homopolymer of a conjugated diene or a copolymer thereof with up to 10% by weight of copolymerized styrene or acrylonitrile and having a gel content of more than 50%, (b) a first shell which is a crosslinked rubber formed by polymerizing a monomer mixture consisting of at least one acrylic acid alkyl ester having 1 to 8 carbon atoms in the alkyl moiety and 0.05 to 10% by weight, based on the weight of (b), of a crosslinking polyfunctional monomer and (c) a second shell of a polymer of at least one resin-forming monomer selected from the group consisting of α-methyl styrene, styrene, acrylonitrile and methyl methacrylate.
Claim 2
Dependent Claim
118 words
Particulate graft polymer comprising (a) a core which is a crosslinked homopolymer of a conjugated diene or a copolymer thereof with up to 10% by weight of copolymerized styrene or acrylonitrile and having a gel content of more than 50%, (b) a first shell which is a crosslinked rubber formed by polymerizing a monomer mixture consisting of at least one acrylic acid alkyl ester having 1 to 8 carbon atoms in the alkyl moiety and 0.05 to 10% by weight, based on the weight of (b), of a crosslinking polyfunctional monomer and (c) a second shell of a polymer of at least one resin-forming monomer selected from the group consisting of α-methyl styrene, styrene, acrylonitrile and methyl methacrylate.
Claim 3
Dependent Claim
23 words
Particulate graft polymer according to claim 1, wherein the weight ratio of (a) and (b) is 0.1 to 99.9 to 80 to 20.
Claim 4
Dependent Claim
13 words
Particulate graft polymer according to claim 1, wherein the core (a) is polybutadiene.
Claim 5
Dependent Claim
16 words
Particulate graft polymer according to claim 1, wherein (c) is a copolymer of styrene and acrylonitrile.
Claim 6
Dependent Claim
17 words
A moulding composition comprising a particulate graft polymer according to claim 1 and a rigid thermoplastic resin.
Claim 7
Dependent Claim
17 words
A moulding composition as claimed in claim 5, wherein the rigid thermoplastic resin is a styrene/acrylonitrile copolymer.
References Cited (Backward Citations)
FR1371866A
Cited
US3636138A
Cited
US3886232A
Cited
US3956424A
Cited
US3900529A
Cited
FR2246594B1
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1986-07-11 | 1987-01-10 | 1987-07-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1990-07-11 | 1991-01-10 | 1991-07-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1994-07-11 | 1995-01-10 | 1995-07-12 | $7700.00 | Window Closed / Lapsed |