Flame retardant brominated styrene-based polymers
AssigneeGreat Lakes Chemical Corporation
InventorsNicolai A. Favstritsky, Jin-Liang Nang
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Abstract
Halogenated styrene-based polymers having surprisingly good physical properties in combination with flame retardancy include copolymers of ring-halogenated, ethylenically unsaturated aromatic monomers and aliphatic conjugated dienes having from 4 to 10 carbon atoms, and terpolymers of ring-halogenated, ethylenically unsaturated aromatic monomers, halogen-free aromatic monomers, and aliphatic conjugated dienes having from 4 to 10 carbon atoms.
Claims33
A thermally and hydrolytically stable flame retardant copolymer comprising:
- about 95 to about 5 weight percent of units from ring brominated, ethylenically unsaturated aromatic monomer, said monomer including greater than about 1 and up to about 4 bromines per unit;
- and
- about 5 to about 95 weight percent of units from aliphatic conjugated diene monomer having from 4 to 10 carbon atoms,
- said copolymer having a molecular weight of at least about 25,000.
A thermally and hydrolytically stable flame retardant copolymer comprising the formula:
- ##STR5## in which n is an integer;
- R.sub.1 is H or CH.sub.3 ;
- R.sub.2 is H or a C.sub.1-4 lower alkyl group;
- R.sub.3 is H, Cl or CH.sub.3 ;
- and x=greater than 1 to 4, said polymer having a molecular weight of at least about 25,000.
A thermally and hydrolytically stable flame retardant terpolymer comprising:
- about 90 to about 5 weight percent of units from ring-brominated, ethylenically unsaturated aromatic monomer, said monomer including greater than about 1 and up to about 4 bromines per unit;
- about 5 to about 90 weight percent of units from halogen-free aromatic monomer;
- and
- about 90 to about 5 weight percent of units from aliphatic conjugated diene monomer having from 4 to 10 carbon atoms,
- said terpolymer having a molecular weight of at least about 25,000.
A thermally and hydrolytically stable flame retardant terpolymer comprising the formula:
- ##STR6## in which n is an integer;
- R.sub.1 is H or CH.sub.3 ;
- R.sub.2 is H or a C.sub.1-4 lower alkyl group;
- R.sub.3 is H, Cl or CH.sub.3 ;
- and x=greater than 1 to 4, said polymer having a molecular weight of at least about 25,000.
Dependencies are inferred from the claim text.