US4028486A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Alpha-methyl-p-bromo-styrene and method of preparation
Assignee: Goodyear Tire and Rubber Co
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Filing: 1976-05-07
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Granted: 1977-06-07
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Expires: 1996-05-07
Abstract
Abstract Alpha-methyl-p-bromo-styrene prepared by the manipulative steps of brominating poly(α-methyl-styrene) and subsequently depolymerizing the brominated polymer. The alpha-methyl-p-bromo-styrene has particular utility as a co-monomer for preparing copolymers exhibiting a flame retardancy.
Inventors
- 👤 George Jalics
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 16:09
CPC Classifications
C; C08; C08F; C08F8/00; C08F8/50; C08F212/00; C08F212/02; C08F212/04; C08F212/14; C08F212/16; C08F212/21; Y; Y10; Y10S; Y10S526/00; Y10S526/914
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
160 words
A copolymer of α-methyl-p-bromo-styrene and a vinyl polymerizable double bond monomer prepared by free radical addition solvent or emulsion copolymerizing a mixture of about 5 to about 20 weight percent α-methyl-p-bromo-styrene and, correspondingly, about 95 to about 80 weight percent vinyl polymerizable double bond monomer, where said double bond monomer is selected from at least one of dienes selected from 1,3-butadiene, isoprene, dimethyl butadiene and piperylene; monoolefins selected from ethylene, propylene and isobutylene; vinyl aromatic compounds selected from styrene, chlorostyrene, vinyl toluene, α-methyl styrene and divinyl benzene; monobasic acid esters selected from alkyl (C 1 to C 10 ) and alkoxy (C 1 -C 4 ) acrylates and methacrylates; dibasic acid esters selected from maleate, fumarate and itaconates; vinyl cyanides selected from acrylonitrile and methacrylonitrile; vinyl chloride, vinylidene chloride; methyl vinyl ether; vinyl esters selected from vinyl acetate and esters of C 8 -C 10 acids; vinyl phosphonates; organophosphates selected from mono-, di- and triallyl phosphates; vinyl silanes; antimony fumarate.
Claim 2
Dependent Claim
160 words
A copolymer of α-methyl-p-bromo-styrene and a vinyl polymerizable double bond monomer prepared by free radical addition solvent or emulsion copolymerizing a mixture of about 5 to about 20 weight percent α-methyl-p-bromo-styrene and, correspondingly, about 95 to about 80 weight percent vinyl polymerizable double bond monomer, where said double bond monomer is selected from at least one of dienes selected from 1,3-butadiene, isoprene, dimethyl butadiene and piperylene; monoolefins selected from ethylene, propylene and isobutylene; vinyl aromatic compounds selected from styrene, chlorostyrene, vinyl toluene, α-methyl styrene and divinyl benzene; monobasic acid esters selected from alkyl (C 1 to C 10 ) and alkoxy (C 1 -C 4 ) acrylates and methacrylates; dibasic acid esters selected from maleate, fumarate and itaconates; vinyl cyanides selected from acrylonitrile and methacrylonitrile; vinyl chloride, vinylidene chloride; methyl vinyl ether; vinyl esters selected from vinyl acetate and esters of C 8 -C 10 acids; vinyl phosphonates; organophosphates selected from mono-, di- and triallyl phosphates; vinyl silanes; antimony fumarate.
Claim 3
Dependent Claim
13 words
The copolymer of claim 1 where said double bond monomer is methyl methacrylate.
Claim 4
Dependent Claim
49 words
The copolymer of claim 1 prepared by aqueous emulsion polymerizing α-methyl-p-bromo-styrene with a mixture of vinyl polymerizable double bond monomers comprised of (1) butadiene and (2) acrylonitrile or styrene, where the weight ratio of butadiene to acrylonitrile or styrene is in the range of about 1/1 to about 10/1.
Claim 5
Dependent Claim
42 words
The copolymer of claim 3 where said copolymer is prepared by aqueous emulsion polymerizing a mixture of α-methyl-p-bromo-styrene of claim 7, 1,3-butadiene and styrene, where said mixture comprises about 5 to about 20 weight percent α-methyl-p-bromo-styrene based on the total monomer mixture.
References Cited (Backward Citations)
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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) | 1980-06-06 | 1980-12-06 | 1981-06-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-06-06 | 1984-12-06 | 1985-06-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-06-06 | 1988-12-06 | 1989-06-07 | $7700.00 | Window Closed / Lapsed |