Patent US4427832A successfully refreshed from Google Patents.
US4427832A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Thermoplastic resin compositions
Assignee: Denka Co Ltd
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Filing: 1981-07-17
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Granted: 1984-01-24
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Expires: 2001-07-17
Abstract
Abstract In the emulsion polymerization of a monomer mixture comprising an aromatic vinyl compound, a vinyl cyanide compound and if desired, other vinyl compounds copolymerizable therewith in an aqueous medium, the vinyl cyanide compound is further added to the polymerization system in a controlled velocity during the substantial period of polymerization from the initial stage. When the copolymer thus obtained is incorporated into, for example, an acrylonitrile-butadiene-styrene terpolymer composition, thermoplastic resin compositions not coloring upon molding are obtained with a good impact resistance and heat resistance.
Inventors
- 👤 Norio Yagi
- 👤 Hisashi Chiba
- 👤 Yutaka Mitsuda
- 👤 Yasuaki Sakano
- 👤 Masaki Aikawa
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-10 01:26
CPC Classifications
C; C08; C08L; C08L25/00; C08L25/02; C08L25/04; C08L25/08; C08L25/12; C08F; C08F212/00; C08F212/02; C08F212/04; C08F212/06; C08F212/08; C08F212/10; C08F212/12; C08L33/00; C08L33/18; C08L33/20; C08L27/00; C08L27/02; C08L27/04; C08L27/06; C08L51/00; C08L51/06; C08L55/00; C08L55/02
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
155 words
A process for the preparation of copolymers by the emulsion polymerization of a monomer mixture comprising 65 to 80% by weight of α-methylstyrene, 15 to 30% by weight of a vinyl cyanide compound and 0 to 20% by weight of other vinyl compounds copolymerizable therewith in an aqueous medium, which comprises carrying out the polymerization in one stage of polymerization while initiating the polymerization in the presence of the whole amount of α-methylstyrene and a partial amount of the vinyl cyanide compound, adding the residual amount of the vinyl cyanide compound continuously or intermittently in the course of the polymerization from initial stage up to termination of the polymerization and maintaining a proportion of unreacted monomers present during substantially the entire time of the polymerization to be such that a molar ratio of the total of α-methylstyrene and the copolymerizable vinyl compound to the vinyl cyanide compound is within the range of 1.3 to 3.0.
Claim 2
Dependent Claim
155 words
A process for the preparation of copolymers by the emulsion polymerization of a monomer mixture comprising 65 to 80% by weight of α-methylstyrene, 15 to 30% by weight of a vinyl cyanide compound and 0 to 20% by weight of other vinyl compounds copolymerizable therewith in an aqueous medium, which comprises carrying out the polymerization in one stage of polymerization while initiating the polymerization in the presence of the whole amount of α-methylstyrene and a partial amount of the vinyl cyanide compound, adding the residual amount of the vinyl cyanide compound continuously or intermittently in the course of the polymerization from initial stage up to termination of the polymerization and maintaining a proportion of unreacted monomers present during substantially the entire time of the polymerization to be such that a molar ratio of the total of α-methylstyrene and the copolymerizable vinyl compound to the vinyl cyanide compound is within the range of 1.3 to 3.0.
Claim 3
Dependent Claim
17 words
The process of claim 1 wherein the vinyl cyanide compound is acrylonitrile, methacrylonitrile or a mixture thereof.
Claim 4
Dependent Claim
29 words
The process of claim 1 wherein the vinyl cyanide compound is added continuously during substantially the entire time of polymerization from the initial stage up to termination of polymerization.
Claim 5
Dependent Claim
15 words
The process of claim 1 wherein the copolymerizable vinyl compound is an aromatic vinyl compound.
Claim 6
Dependent Claim
12 words
The process of claim 1 wherein the copolymerizable vinyl compound is styrene.
Claim 7
Dependent Claim
13 words
The process of claim 1 wherein the copolymerizable vinyl compound is methacrylic acid.
Claim 8
Dependent Claim
12 words
The process of claim 1 wherein the copolymerizable vinyl compound is N-phenylmaleimide.
Claim 9
Dependent Claim
73 words
A thermoplastic resin composition which comprises (A) 10˜90% by weight of the copolymer obtained by the process of claim 1 and (B) 10˜90% by weight of a polymer composition selected from the group consisting of an acrylonitrile/butadiene/styrene polymer composition, an acrylonitrile/ethylene.propylene.diene rubber/styrene polymer composition, an acrylonitrile/chlorosulfonated polyethylene/styrene polymer composition, an acrylonitrile/acrylic rubber/styrene polymer composition and a vinyl chloride polymer composition, said (A) and (B) forming 100% by weight of said thermoplastic resin composition.
Claim 10
Dependent Claim
42 words
A heat resistance and impact resistance resin composition comprising (C) 10˜80% by weight of the composition of claim 8 and (D) 20˜90% by weight of a vinyl chloride polymer composition, said (C) and (D) forming 100% by weight of said resin composition.
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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) | 1987-01-23 | 1987-07-25 | 1988-01-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1991-01-23 | 1991-07-25 | 1992-01-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1995-01-23 | 1995-07-25 | 1996-01-24 | $7700.00 | Window Closed / Lapsed |