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US 7,612,156 B2Granted
Polymers of bromostyrenes having controlled molecular weight
AssigneeChemtura Corporation
InventorsWayne Meyer, Jennifer L. Bohan, Larry D. Timberlake, James D. Siebecker
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Abstract
A controlled molecular weight polymer of styrene is provided having bromine substituted thereon. Control of molecular weight is achieved by the use of alpha-methyl styrene dimer as a chain transfer agent. The brominated polymer of styrene is useful as a flame retardant, particularly for polyamides giving improved properties including color retention after molding.
Claims5
Polymers of ar-bromostyrene monomers having the following general structure
- where R is H and x is 3, where the polymers have an assigned weight average molecular weight (MW) compared with a polystyrene standard as measured by gel permeation chromatography of from about 11,000 to about 60,000, wherein the polymers further comprise residues of α-methyl styrene dimer.
Polymers of ar-bromostyrene monomers having the following general structure
- where R is H and x is 3, where the polymers have an assigned weight average molecular weight of from about 11,000 to about 60,000, wherein the polymers retain at least 88% of their mass after 20 minutes and at least 85% of their mass after 30 minutes when a 10 mg specimen is held at 330° C. under a nitrogen atmosphere.
Dependencies are inferred from the claim text.