Nippon Zeon Company, Ltd.

Atsuo Ishikawa

Riso Iwata

Hisataka Komai

Hidemi Tsubaki

Yonesaku Shinohara

Hitoshi Takahata

A novel unsaturated polyester resin composition comprising an unsaturated alkyd and a crosslinkable vinyl monomer, said unsaturated alkyd being a modified unsaturated alkyd obtained by reacting a polybasic acid with a polyhydric alcohol in the presence of a cyclopentadiene-type oil having a viscosity at 25.degree. C. of 50 to 50,000.

Unsaturated polyester resin composition

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.

Novel hydrocarbon resins and process for preparation thereof

A pressure sensitive adhesive composition comprising (A) 100 parts by weight of a conjugated diene-type rubber, and (B) 30 to 250 parts by weight of a hydrocarbon resin having a softening point of 60.degree. C to 140.degree. C and comprising (a) 45 to 85% by weight of a unit derived from 1,3-pentadiene, (b) 10 to 45% by weight of a unit derived from .alpha.-methylstyrene, (c) 3 to 20% by weight of a unit derived from cyclopentene, (d) 0 to 20% by weight of a unit derived from 1,3-butadiene, and (e) 0 to 5% by weight of a unit derived from a copolymerizable monomer selected from isoprene, cyclopentadiene and dicyclopentadiene.

Pressure sensitive adhesive

Hydrocarbon resins having a softening point of 60.degree.-140.degree.C and a Gardner color of 6 or less and having excellent cohesive strength and thermal stability prepared by copolymerizing 1,3-pentadiene and cyclopentene, together with, if desired, 1,3-butadiene or isobutene and small amounts of incidental other olefins in the presence of aluminum chloride.

Growing community of inventors

Kamakura, Japan

Atsuo Ishikawa