| 摘要 |
PROBLEM TO BE SOLVED: To obtain a composition having good compatibility with a softening agent and excellent in thermal stability and mechanical strength by mixing an isobutylene-based block copolymer, a polyolefinic resin and a softening agent. SOLUTION: The titled composition comprises 100 pts.wt. of an isobutylene- based block copolymer comprising a polymer block consisting mainly of isobutylene and a polymer block consisting mainly of a monomer component other than isobutylene; 5-400 pts.wt. of a polyolefinic resin; and 5-1,000 pts.wt. of a softening agent. The monomer component consisting mainly of a monomer other than isobutylene is preferably one consisting mainly of an aromatic vinyl monomer from the viewpoint of the balance between properties of the polymer and polymerization behavior and so on. The preferred aromatic vinyl monomers are styrene,α-methylstyrene, p-methylstyrene, indene and the like. And as the polyolefinic resin are preferable a polyethylenic resin and a polypropylenic resin.
|
