| 摘要 |
<p>PROBLEM TO BE SOLVED: To obtain the subject oligomer readily meltable and dispersible into resins such as a general-purpose polypropylene and an impact-resistant polystyrene, capable of developing high flame-retardance, heat resistance and processability without lowering mechanical properties of resin and without changing the color of resin, by possessing specific physical properties. SOLUTION: This oligomer shows physical properties of 300-1,200 weight- average molecular weight calculated as polystyrene, 40-70 wt.% of bromine content, 50-150 deg.C softening point as light yellow powder, heat stability measured by a thermobalance of 5% reduction at >=300 deg.C and 50% reduction at >=350 deg.C. The oligomer is produced by brominating a styrene oligomer having 300-1,200 weight-average molecular weight obtained by cationic polymerization with a brominating agent such as bromine chloride in a solvent such as dichloromethane inert to the reaction in the presence of a catalyst such as antimony trichloride. The oligomer is meltable and dispersible into an acrylonitrile-styrene-butadiene copolymer resin, a polybutylene terephthalate, etc.</p> |
