Thermoplastic elastomer composition

Abstract

A thermoplastic elastomer composition containing a dynamically cross-linked composition of (A) 10 to 70 parts by weight of a thermoplastic resin, (B) 30 to 90 parts by weight of a modified butyl rubber composition containing a modified butyl rubber modified reacting, to butyl rubber, (a) a compound containing, in the molecule thereof, a nitroxide free radical stable at an ordinary temperature in the presence of oxygen, and (c) a bifunctional or higher functional radical polymerizable monomer, and (C) 0.01 to 15 parts by weight of a cross-linking agent.

1 . A thermoplastic elastomer composition: comprising a dynamically cross-linked composition of
 (A) 10 to 70 parts by weight of a thermoplastic resin,   (B) 30 to 90 parts by weight of a modified butyl rubber composition containing a modified butyl rubber modified by reacting, to butyl rubber, (a) a compound containing, in the molecule thereof, a nitroxide free radical stable at an ordinary temperature in the presence of oxygen, (b) a radical initiator and (c) a bifunctional or higher functional radical polymerizable monomer, and   (C) 0.01 to 15 parts by weight of a cross-linking agent.   
     
     
         2 . A thermoplastic elastomer composition as claimed in  claim 1 , wherein the component (A) is a crystalline polyolefin. 
     
     
         3 . A thermoplastic elastomer composition as claimed in  claim 1 , wherein the component (C) is an organic peroxide or an organic azo compound. 
     
     
         4 . A thermoplastic elastomer composition as claimed in  claim 2 , wherein the crystalline polyolefin of the component (A) is at least one polyolefin selected from the group consisting of polyethylene, polypropylene, ethylene-propylene copolymer, copolymer of ethylene and/or propylene and α-olefin and copolymer of ethylene and/or propylene and butene.