US 11,866,615 B2
Hot-melt composition and sealing material
Daisuke Kumon, Tokyo (JP); and Akito Nakagawa, Tokyo (JP)
Assigned to ASAHI CHEMICAL SYNTHETIC CO., LTD., Tokyo (JP)
Appl. No. 17/255,248
Filed by ASAHI CHEMICAL SYNTHETIC CO., LTD., Tokyo (JP)
PCT Filed Oct. 11, 2019, PCT No. PCT/JP2019/040193
§ 371(c)(1), (2) Date Dec. 22, 2020,
PCT Pub. No. WO2020/080280, PCT Pub. Date Apr. 23, 2020.
Claims priority of application No. 2018-196399 (JP), filed on Oct. 18, 2018.
Prior Publication US 2021/0261835 A1, Aug. 26, 2021
Int. Cl. C09J 109/06 (2006.01); C09J 125/10 (2006.01); C09J 153/02 (2006.01); C09J 5/06 (2006.01); C09J 11/06 (2006.01); C09J 11/08 (2006.01)
CPC C09J 153/025 (2013.01) [C09J 5/06 (2013.01); C09J 11/06 (2013.01); C09J 11/08 (2013.01); C09J 109/06 (2013.01); C09J 125/10 (2013.01); C09J 2453/00 (2013.01)] 10 Claims
 
1. A hot-melt composition comprising, with respect to 100 parts by mass of a hydrogenated styrene thermoplastic elastomer having styrene-based polymer blocks at both ends and a hydrogenated diene polymer block at a middle portion and having an a mass-average molecular weight of 250,000 to 600,000 (A), 150 to 450 parts by mass of an aromatic tackifying resin having a softening point of 135 to 160° C. and a mass-average molecular weight of 500 to 2,500 (B), 100 to 500 parts by mass of a tackifying resin for a hydrogenated diene polymer block which has a softening point of 100 to 160° C. (C), 500 to 1,500 parts by mass of a non-aromatic hydrocarbon oil having a kinematic viscosity at 40° C. of 90 mm2/s or higher (D), wherein 30% by mass or more of the non-aromatic hydrocarbon oil (D) is a non-aromatic hydrocarbon oil having a kinematic viscosity at 40° C. of 300 to 500 mm2/s (D-1).