Bridgestone Corporation

Yasunori Fukuda

Naruhiko Mashita

Jun Arai

Tadashi Utsunomiya

Takashi Shimizu

Kunio Machida

Shinichi Toyosawa

Youichi Nishimuro

Yasushi Imai

Youkou Saito

Shoson Shibata

The elastic member for an ink jet recording apparatus according to the present invention is formed from:

Elastic members for inkjet recording apparatus ink tanks and inkjet recording apparatus

There are disclosed a thermoplastic elastomer composition which comprises (a) a hydrogenated block copolymer obtained by hydrogenating the block copolymer comprising at least one polymer block composed principally of a vinylic aromatic compound and at least one polymer block composed principally of a conjugated diene compound; (b) a non-aromatic base softening agent having a kinematic viscosity at 40&deg; C. of at least 100 mm /sec; and (c) propylene homopolymer and/or propylene copolymer comprising propylene as a principal component which is obtained through polymerization by using a metallocene catalyst, which is free from a lubricant, which has been heat treated, or which has a MFR (melt flow rate) in a specific range; a gasket material which comprises the above thermoplastic elastomer composition and is particularly suited for use in hard disc units because of its excellent sealing properties and its capability of preventing gas generation; a method for injection molding the above composition; an external anti-sticking agent for a thermoplastic elastomer or rubber which comprises fine particulates of ultrahigh molecular weight polyethylene having an average particle diameter in a specific range, and which is minimized in hygroscopicity, oil absorptivity and volatility, and has high heat resistance and anti-stickiness; and rubber and/or a thermoplastic elastomer which is incorporated with the above external anti-sticking agent and imparted with anti-stickiness.

Thermoplastic elastomer composition and gasket material

Growing community of inventors

Kanagawa, Japan

Yasunori Fukuda