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AssigneeNippon Zeon Co., Ltd.
InventorsAtsuo Ishikawa, Hidemi Tsubaki, Hitoshi Takahata, Riso Iwata, Yonesaku Shinohara
Estimating the term…
Hydrocarbon resins comprising (a) about 45 to 85% by weight of units derived from 1,3-pentadiene, (b) about 10 to 45% by weight of units derived from .alpha.-methylstyrene, (c) about 3 to 20% by weight of units derived from cyclopentene and (d) 0 to about 20% by weight of units derived from 1,3-butadiene and having a softening point of from about 60.degree. C. to about 140.degree. C., said hydrocarbon resins being prepared by polymerizing a monomeric mixture comprising (a) about 35 to 85% by weight of 1,3-pentadiene, (b) about 10 to 50% by weight of .alpha.-methylstyrene, (c) about 5 to 30% by weight of cyclopentene and (d) 0 to 15% by weight of 1,3-butadiene in a solvent comprising at least 50% by weight of an aromatic hydrocarbon in the presence of an aluminum halide as a catalyst.
A method for preparing hydrocarbon resin polymers which comprises polymerizing a monomeric mixture consisting essentially of about 35 to 85% by weight of 1,3-pentadiene, (b) about 10 to 50% by weight of .alpha.-methylstyrene, (c) about 5 to 30% by weight of cyclopentene and (d) 0 to about 15% by weight of 1,3-butadiene in a solvent comprising at least 50% by weight of an aromatic hydrocarbon and in the presence of an aluminum halide as a catalyst.
Dependencies are inferred from the claim text.