	US 11,753,569 B2
	Hot-melt composition and sealing material
Tomonobu Yamauchi, Tokyo (JP); Kazuya Furukawa, Tokyo (JP); Daisuke Kumon, Tokyo (JP); and Takashi Koga, Tokyo (JP)
Assigned to ASAHI CHEMICAL SYNTHETIC CO., LTD., Tokyo (JP)
Appl. No. 16/636,984
Filed by ASAHI CHEMICAL SYNTHETIC CO., LTD., Tokyo (JP)
PCT Filed Jul. 30, 2018, PCT No. PCT/JP2018/028468 § 371(c)(1), (2) Date Feb. 6, 2020, PCT Pub. No. WO2019/031290, PCT Pub. Date Feb. 14, 2019.
Claims priority of application No. 2017-152493 (JP), filed on Aug. 7, 2017.
Prior Publication US 2020/0255712 A1, Aug. 13, 2020
Int. Cl. C09J 191/00 (2006.01); C09J 153/02 (2006.01); C09J 125/08 (2006.01); C08L 25/08 (2006.01); C08L 25/04 (2006.01); C09J 125/16 (2006.01)

CPC C09J 191/00 (2013.01) [C08L 25/04 (2013.01); C08L 25/08 (2013.01); C09J 125/08 (2013.01); C09J 125/16 (2013.01); C09J 153/02 (2013.01); C09J 153/025 (2013.01); C08L 2203/162 (2013.01); C08L 2205/03 (2013.01)]

11 Claims

1. A hot-melt composition comprising, with respect to 100 parts by mass of (A) 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 a mass-average molecular weight of 250,000-600,000, 20-150 parts by mass of (B) a first styrene-based tackifying resin having a softening point of 135-160° C., 100-400 parts by mass of (C) a second styrene-based tackifying resin having a softening point of 105-135° C., 100-500 parts by mass of (D) a third tackifying resin for the hydrogenated diene polymer block having a softening point of 100-160° C. and 500-1,500 parts by mass of (E) a liquid softener, wherein a difference between the softening point of the first styrene-based tackifying resin and the softening point of the second styrene-based tackifying resin is 10° C. or higher.