US4618663A
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Process for preparing α-methylstyrene-acrylonitrile copolymers
Assignee: Kanegafuchi Chemical Industry Co Ltd
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Filing: 1983-09-23
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Granted: 1986-10-21
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Expires: 2003-09-23
Abstract
Abstract A process for preparing alpha -methylstyrene/acrylonitrile copolymers by suspension or bulk polymerization of alpha -methylstyrene and acrylonitrile with or without other vinyl compounds such as styrene, methyl methacrylate, vinyl toluene and t-butylstyrene in the presence of a difunctional organic peroxide, preferably a difunctional organic peroxide having a 10 hour half-life temperature of 60 DEG to 110 DEG C., at a polymerization temperature of 80 DEG to 120 DEG C. The process produces the copolymers having excellent transparency, heat resistance and strength in high conversions in a short time.
Inventors
- 👤 Masao Nakagawa
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-10 01:27
CPC Classifications
C; C08; C08F; C08F212/00; C08F212/02; C08F212/04; C08F212/06; C08F212/12; C08F220/00; C08F220/02; C08F220/42; C08F220/44
Claims Analysis
Total Claims: 16
Claim 1
Independent Claim
80 words
A process for preparing a copolymer having improved transparency at high conversion levels which comprises copolymerizing 10 to 80% by weight of α-methylstyrene, 5 to 50% by weight of acrylonitrile and 0 to 70% by weight of at least one member selected from the group consisting of styrene, methyl methacrylate, vinyl toluene and t-butylstyrene in the presence of a difunctional organic peroxide as an initiator at a temperature of 80° to 120° C. in a suspension or bulk polymerization manner.
Claim 2
Dependent Claim
80 words
A process for preparing a copolymer having improved transparency at high conversion levels which comprises copolymerizing 10 to 80% by weight of α-methylstyrene, 5 to 50% by weight of acrylonitrile and 0 to 70% by weight of at least one member selected from the group consisting of styrene, methyl methacrylate, vinyl toluene and t-butylstyrene in the presence of a difunctional organic peroxide as an initiator at a temperature of 80° to 120° C. in a suspension or bulk polymerization manner.
Claim 3
Dependent Claim
21 words
The process of claim 1, wherein said difunctional organic peroxide has a 10 hour half-life temperature of 60° to 110° C.
Claim 4
Dependent Claim
15 words
The process of claim 2, wherein said difunctional organic peroxide is di-t-butyl peroxyhexahydroterephthalate or di-t-butylperoxy-3,3,5-trimethylcyclohexane.
Claim 5
Dependent Claim
36 words
The process of claim 1, wherein from 20 to 80% by weight of α-methylstyrene and from 10 to 40% by weight of acrylonitrile are copolymerized in the presence of said difunctional organic peroxide as an initiator.
Claim 6
Dependent Claim
28 words
The process of claim 1, wherein said difunctional organic peroxide is di-t-butyl peroxyhexahydroterephthalate, 2,5-dimethyl-2,5-bis(2-ethylhexanoylperoxy)hexane, 1,1-di-t-butylperoxy-3,3,5-trimethylcyclohexane, 1,1-di-t-butylperoxycyclohexane, di-t-butyl peroxyazelate, 2,5-dimethyl-2,5-bis(benzoylperoxy)hexane, 2,2-di(t-butylperoxy)butane, n-butyl ester of 4,4-di-t-butylperoxyvaleric acid or di-t-butyl peroxytrimethyladipate.
Claim 7
Dependent Claim
31 words
The process of claim 5, wherein the amount of difunctional organic peroxide employed as initiator is from 0.1 to 2.0% by weight based on the total weight of the monomers copolymerized.
Claim 8
Dependent Claim
13 words
The process of claim 1, wherein said at least one member is styrene.
Claim 9
Dependent Claim
32 words
The process of claim 3, wherein the amount of the difunctional organic peroxide employed as initiator is from 0.1 to 2.0% by weight based on the total weight of the monomers copolymerized.
Claim 10
Dependent Claim
111 words
A process for preparing a copolymer having improved transparency at high conversion levels which comprises copolymerizing a mixture of monomers containing 10 to 80% by weight of α-methylstyrene, 5 to 50% by weight of acrylonitrile and 0 to 70% by weight of at least one monomer selected from the group consisting of styrene, methyl methacrylate, vinyl toluene and t-butyl styrene in the presence of from 0.1 to 2.0% by weight of a difunctional organic peroxide as an initiator based on the total weight of the monomers copolymerized in said mixture, said mixture of monomers being copolymerized at a temperature of 80° to 120° C. in a suspension or bulk polymerization system.
Claim 11
Dependent Claim
111 words
A process for preparing a copolymer having improved transparency at high conversion levels which comprises copolymerizing a mixture of monomers containing 10 to 80% by weight of α-methylstyrene, 5 to 50% by weight of acrylonitrile and 0 to 70% by weight of at least one monomer selected from the group consisting of styrene, methyl methacrylate, vinyl toluene and t-butyl styrene in the presence of from 0.1 to 2.0% by weight of a difunctional organic peroxide as an initiator based on the total weight of the monomers copolymerized in said mixture, said mixture of monomers being copolymerized at a temperature of 80° to 120° C. in a suspension or bulk polymerization system.
Claim 12
Dependent Claim
41 words
The process of claim 9, wherein 50% by weight of α-methylstyrene, 30% by weight of acylonitrile and 20% by weight of styrene are copolymerized in the presence of an initiator selected from the group consisting of di-t-butyl peroxyhexahydroterephthalate and di-t-butyl peroxy-3,3,5-trimethylcyclohexane.
Claim 13
Dependent Claim
30 words
The process of claim 9, wherein 30% by weight of α-methylstyrene, 10% by weight of acrylonitrile and 60% by weight of styrene are copolymerized in the presence of di-t-butyl peroxyhexahydroterephthalate.
Claim 14
Dependent Claim
28 words
The process of claim 9, wherein said difunctional organic peroxide is di-t-butyl peroxyhexahydroterephthalate, 2,5-dimethyl-2,5-bis(2-ethylhexanoylperoxy)hexane, 1,1-di-t-butylperoxy-3,3,5-trimethylcyclohexane, 1,1-di-t-butylperoxycyclohexane, di-t-butyl peroxyazelate, 2,5-dimethyl-2,5-bis(benzoylperoxy)hexane, 2,2-di(t-butylperoxy)butane, n-butyl ester of 4,4-di-t-butylperoxyvaleric acid or di-t-butyl peroxytrimethyladipate.
Claim 15
Dependent Claim
21 words
The process of claim 9, wherein said difunctional organic peroxide has a 10 hour half-life temperature of 60° to 110° C.
Claim 16
Dependent Claim
15 words
The process of claim 13, wherein said difunctional organic peroxide is di-t-butyl peroxyhexahydroterephthalate or di-t-butylperoxy-3,3,5-trimethylcyclohexane.
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) | 1989-10-20 | 1990-04-21 | 1990-10-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1993-10-20 | 1994-04-21 | 1994-10-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1997-10-20 | 1998-04-21 | 1998-10-21 | $7700.00 | Window Closed / Lapsed |