US 6,981,762 B2
Elastic members for inkjet recording apparatus ink tanks and inkjet recording apparatus
Naruhiko Mashita, Kanagawa (Japan); Youkou Saito, Kanagawa (Japan); Tadashi Utsunomiya, Kanagawa (Japan); Yasunori Fukuda, Kanagawa (Japan); Jun Arai, Kanagawa (Japan); and Shoson Shibata, Kanagawa (Japan)
Assigned to Bridgestone Corporation, Tokyo (Japan)
Appl. No. 10/470,535
PCT Filed Jan. 31, 2002, PCT No. PCT/JP02/00772
§ 371(c)(1), (2), (4) Date Nov. 10, 2003,
PCT Pub. No. WO02/060697, PCT Pub. Date Aug. 08, 2002.
Claims priority of application No. 2001-022868 (JP), filed on Jan. 31, 2001; application No. 2001-022869 (JP), filed on Jan. 31, 2001; and application No. 2001-103115 (JP), filed on Apr. 02, 2001.
Prior Publication US 2004/0070653 A1, Apr. 15, 2004
Int. Cl. B41J 2/175 (2006.01)
U.S. Cl. 347—86 27 Claims
 
1. 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.