US 12,252,637 B2
Two-pack curable urethane adhesive
Yuko Narutaki, Kyoto (JP); Tetsuya Shimada, Kyoto (JP); and Yuuki Tanaka, Kyoto (JP)
Assigned to SANYO CHEMICAL INDUSTRIES, LTD., Kyoto (JP)
Appl. No. 17/311,929
Filed by SANYO CHEMICAL INDUSTRIES, LTD., Kyoto (JP)
PCT Filed Dec. 9, 2019, PCT No. PCT/JP2019/048000
§ 371(c)(1), (2) Date Jun. 8, 2021,
PCT Pub. No. WO2020/121993, PCT Pub. Date Jun. 18, 2020.
Claims priority of application No. 2018-231230 (JP), filed on Dec. 11, 2018.
Prior Publication US 2022/0089922 A1, Mar. 24, 2022
Int. Cl. C09J 175/08 (2006.01); C08G 18/12 (2006.01); C08G 18/16 (2006.01); C08G 18/22 (2006.01); C08G 18/32 (2006.01); C08G 18/48 (2006.01); C08G 18/73 (2006.01); C08G 18/75 (2006.01)
CPC C09J 175/08 (2013.01) [C08G 18/12 (2013.01); C08G 18/168 (2013.01); C08G 18/225 (2013.01); C08G 18/3206 (2013.01); C08G 18/3228 (2013.01); C08G 18/4804 (2013.01); C08G 18/4825 (2013.01); C08G 18/4829 (2013.01); C08G 18/4845 (2013.01); C08G 18/73 (2013.01); C08G 18/755 (2013.01); C08G 2170/00 (2013.01); C09J 2301/30 (2020.08)] 6 Claims
 
1. A two-component curable urethane adhesive comprising:
a main agent; and
a curing agent,
the main agent containing at least one of a hydroxy group-containing urethane prepolymer (P1) or a polyol component (A), the hydroxy group-containing urethane prepolymer (P1) being a reaction product between the polyol component (A) and an organic polyisocyanate component (B),
the curing agent containing at least one of an isocyanate group-containing urethane prepolymer (P2) or an organic polyisocyanate component (B), the isocyanate group-containing urethane prepolymer (P2) being a reaction product between the polyol component (A) and the organic polyisocyanate component (B),
the main agent containing the urethane prepolymer (P1), or the curing agent containing the urethane prepolymer (P2), or the main agent and the curing agent containing the urethane prepolymer (P1) and the urethane prepolymer (P2), respectively,
wherein the two-component curable urethane adhesive satisfies the following properties (1) to (5):
(1) at least one of the polyol component (A) used in the hydroxy group-containing urethane prepolymer (P1) or the polyol component (A) used as the main agent contains a polyol (A1) having at least one of a group represented by a formula (1) or a group represented by a formula (2) at a molecular end thereof, and a total number of groups represented by the formula (1) in the polyol (A1) accounts for 40% or more based on a total number of groups represented by the formulas (1) and (2) in the polyol (A1),

OG Complex Work Unit Chemistry
wherein in the formulas (1) and (2), each a is independently an integer of 0 or greater;
(2) an average total unsaturation degree of all the polyol components (A) used in the two-component curable urethane adhesive is 0.010 meq/g or less;
(3) a weight average molecular weight of each of the urethane prepolymer (P1) and the urethane prepolymer (P2) is 1,000 to 100,000;
(4) a chemical formula weight or number average molecular weight of each of the polyol component (A) and the organic polyisocyanate component (B) is 20,000 or less; and
(5) a total weight of solvents in the main agent excluding the polyol component (A) and solvents in the curing agent excluding the organic polyisocyanate component (B) accounts for 5 wt % or less based on a total weight of the main agent and the curing agent.