Patent ID: 6981762

Claim:
An elastic member for an ink jet recording apparatus in which an ink is fed to record printed letters on a recording medium, characterized by being constituted from a thermoplastic elastomer composition comprising: (a) 100 parts by weight of a hydrogenated block copolymer obtained by hydrogenating a block copolymer which comprises three polymer blocks, in which polymer blocks at both ends out of the above three polymer blocks are polymer blocks comprising principally a vinyl aromatic compound and in which a polymer block present between the polymer blocks at the above both ends is a polymer block comprising principally a conjugate diene compound, wherein a weight average molecular weight measured by gel permeation chromatography (GPC) is 200,000 or more, (b) 60 to 170 parts by weight of a softening agent for a non-aromatic rubber which has a dynamic viscosity of 350 to 400 mm2/sec at 40° C. and in which a ratio (Mw/Mn) of a weight average molecular weight to a number average molecular weight each measured by gel permeation chromatography (GPC) is 1.8 or less and (c) 5 to 30 parts by weight of polypropylene.