| 摘要 |
<p>1476551 Styrene copolymers GOODYEAR TIRE & RUBBER CO 17 April 1975 [13 May 1974] 15895/75 Heading C3P A resinous copolymer of 50-75% by wt. of styrene, 15-40% of isobutylene and 5-30% of butadiene with a weight ratio isobutylene: butadiene of 0À6-4À1 having a softening point of 60-110‹ C. is obtained by polymerizing a mixture of 45-70% styrene, 10-35% isobutylene and 8-35% butadiene, the mol weight ratio isobutylene : butadiene being 0À5-3 : 1 in the presence of aluminium chloride or ethyl aluminium dichloride and a solvent which is a C 6 -C 8 aromatic or C 3 -C 7 , aliphatic hydrocarbon containing 50-200 ppm of dissolved water.</p> |
