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AssigneeSumitomo Chemical Company, Limited
InventorsKen-ichi Kudo, Yoshihiko Kitagawa, Teruhisa Koyama, Akira Takata, Shuichi Kanagawa, Tetsuo Yamaguchi
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A novel copolymer resin having excellent compatibility with rubber and plastics, stable to air, easily soluble in the hydrocarbon solvents and free of gel, said resin being obtained either (1) by copolymerizing one or more of the monomeric substances selected from the group consisting of cyclopentadiene, dicyclopentadiene and alkyl-substituted compounds thereof and one or more of the substances selected from the hydroxystyrene derivatives, or (2) by copolymerizing one or more of the monomeric substances selected from the group consisting of cyclopentadiene, dicyclopentadiene and alkyl-substituted compounds thereof, one or more of the substances selected from the codimers of cyclopentadiene and/or alkyl-substituted compounds thereof and chain conjugated diolefins having 4 to 5 carbon atoms, and one or more of the substances selected from the hydroxystyrene derivatives. There are also provided compositions comprising said resin and rubber or thermoplastic high-molecular weight substances.
A thermally copolymerized resin having a softening point of 50.degree. to 200.degree. C., a number average molecular weight of 300 to 1,500 measured by vapor pressure osmometry and a bromine number of less than 120 and soluble in hydrocarbon solvents, the composition of said resin comprising (a) 30 to 97 mol % of one or more monomeric substances selected from cyclopentadiene, dicyclopentadiene and alkyl-substituted compounds thereof, and (b) 3 to 70 mol % of one or more hydroxystyrene derivatives.
A method of producing a copolymerized resin, characterized in that a starting monomer component comprising (a) 30 to 97 mol % of one or more monomeric substances selected from cyclopentadiene, dicyclopentadiene and alkyl-substituted compounds thereof and (b) 3 to 70 mol % of one or more hydroxystyrene derivatives is copolymerized thermally at a temperature of 240.degree. to 300.degree. C. without using any catalyst.
Dependencies are inferred from the claim text.