US 12,221,561 B2
Hot melt adhesive composition
Yong Su Park, Daejeon (KR); Tae Yun Kim, Daejeon (KR); Seungwhan Oh, Daejeon (KR); and Jin Young Ryu, Daejeon (KR)
Assigned to LG Chem, Ltd., Seoul (KR)
Appl. No. 16/957,891
Filed by LG Chem, Ltd., Seoul (KR)
PCT Filed Dec. 11, 2018, PCT No. PCT/KR2018/015648
§ 371(c)(1), (2) Date Jun. 25, 2020,
PCT Pub. No. WO2019/132322, PCT Pub. Date Jul. 4, 2019.
Claims priority of application No. 10-2017-0181535 (KR), filed on Dec. 27, 2017.
Prior Publication US 2021/0054249 A1, Feb. 25, 2021
Int. Cl. C09J 153/02 (2006.01); C09J 5/06 (2006.01); C09J 11/08 (2006.01)
CPC C09J 153/02 (2013.01) [C09J 5/06 (2013.01); C09J 11/08 (2013.01); C09J 2301/304 (2020.08); C09J 2301/414 (2020.08); C09J 2425/00 (2013.01)] 12 Claims
 
1. An adhesive member comprising:
a substrate; and
an adhesive layer formed on at least one side of the substrate,
wherein the adhesive layer is formed by a hot melt adhesive composition comprising:
A1) a styrene-butadiene-styrene triblock copolymer, wherein
a1) a content of the styrene-based unit is 30 to 50 wt %,
a2) a diblock content is 60 to 65% by weight, and
a3) a melt flow index measured according to ASTM D1238 at 190° C./5 kg is 30 g/10 min or more;
A2) a styrene-isoprene-styrene triblock copolymer, wherein
a21) a content of the styrene-based unit is 30 to 50 wt %,
a22) a diblock content is less than 5% by weight, and
a23) a melt flow index measured according to ASTM D1238 at 190° C./5 kg is 30 to 50 g/10 min;
B) a tackifier; and
C) a plasticizing oil,
wherein the hot melt adhesive composition has a softening point measured according to the ASTM D36 standard of 85° C. or higher, and
wherein the hot melt adhesive composition has a melt viscosity at 140° C. of 7000 cPs or less, and a viscosity change rate at 160° C. of 15% or less, and
wherein the tackifier is included in an amount of 200 to 400 parts by weight based on 100 parts by weight of the styrene-butadiene-styrene triblock copolymer and the styrene-isoprene-styrene triblock copolymer and
wherein a thickness of the adhesive layer is 10 to 100 μm.