Alpha-methyl-p-bromo-styrene and method of preparation
AssigneeThe Goodyear Tire & Rubber Company
InventorGeorge Jalics
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Abstract
Alpha-methyl-p-bromo-styrene prepared by the manipulative steps of brominating poly(.alpha.-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.
Claims4
A copolymer of .alpha.-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 .alpha.-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, .alpha.-methyl styrene and divinyl benzene;
- monobasic acid esters selected from alkyl (C.sub.1 to C.sub.10) and alkoxy (C.sub.1 -C.sub.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.sub.8 -C.sub.10 acids;
- vinyl phosphonates;
- organophosphates selected from mono-, di- and triallyl phosphates;
- vinyl silanes;
- antimony fumarate.
The copolymer of claim 3 where said copolymer is prepared by aqueous emulsion polymerizing a mixture of .alpha.-methyl-p-bromo-styrene of claim 7, 1,3-butadiene and styrene, where said mixture comprises about 5 to about 20 weight percent .alpha.-methyl-p-bromo-styrene based on the total monomer mixture.
Dependencies are inferred from the claim text.