Abstract: A composite including: (I) a fiber-reinforced composite material; and (II) a metal member joined and fixed to the fiber-reinforced composite material by welding. The fiber-reinforced composite material is composed of reinforcing fibers and a resin composition. The resin composition contains (A) a polypropylene-based resin and (B) a modified polyolefin-based resin. The polypropylene-based resin has a tensile modulus of not less than 1 GPa. The modified polyolefin-based resin is a modified polyolefin resin modified with at least one kind of monomer which is selected from carboxylic acid group-containing vinyl monomers and epoxy group-containing vinyl monomers. A weight ratio between (A) and (B) in the resin composition is 90:10 to 40:60.

Abstract: A cap liner composition including (a) 100 weight parts of isobutylene-based block copolymer containing a polymer block based on isobutylene and a polymer block containing a monomer ingredient not based on isobutylene, and (b) 0.1 to 20 weight parts of lubricant added to the (a) isobutylene-based block copolymer, is provided. Also, a cap liner using the composition is provided. The thus formed cap liner that is used as a sealing material for a beverage cap has an excellent gas barrier property and preferable sanitary characteristics, and it can be opened easily in an actual use.

Abstract: The present invention has its object to provide a thermoplastic resin composition which comprises an isobutylene-based block copolymer and a thermoplastic polyurethane resin, and low in hardness and excellent in oil resistance, transparency, thermal stability, mechanical strength and the like. The present invention provides a thermoplastic resin composition which comprises 30 to 95 parts by weight of (a) an isobutylene-based block copolymer constituted of a polymer block the main constituent of which is isobutylene and a polymer block derived from a monomer composition the main constituent of which is not isobutylene and 70 to 5 parts of a thermoplastic polyurethane resin.