Urethane-based adhesive composition
A urethane adhesive composition contains a urethane prepolymer (A) having an isocyanate group at its terminal, and a compound (B) represented by Formula (1), where R represents a hydrogen atom or an alkyl group, and n represents an integer of 6 or more.
1 . A urethane adhesive composition comprising a urethane prepolymer (A) having an isocyanate group at its terminal, and a compound (B) represented by Formula (1) below,
where R represents a hydrogen atom or an alkyl group, and n represents an integer of to 20, and
wherein a content of the compound (B) is 0.1 to 1.0 mass % based on a total mass of the urethane adhesive composition.
2 . The urethane adhesive composition according to claim 1 , wherein the urethane prepolymer (A) is a urethane prepolymer obtained by mixing a polyether polyol with a number average molecular weight of 500 to 20,000 and an aromatic polyisocyanate such that a ratio of isocyanate groups in the aromatic polyisocyanate to one mole of hydroxyl groups in the polyether polyol is 1.5 to 2.5 moles and reacting them with each other.
3 . The urethane adhesive composition according to claim 1 , further comprising a carbon black or a calcium carbonate.
4 . The urethane adhesive composition according to claim 1 , further comprising a modified isocyanate.
5 . The urethane adhesive composition according to claim 1 , wherein the urethane adhesive composition is a two-part urethane adhesive composition.
6 . The urethane adhesive composition according to claim 1 , wherein n represents an integer of 8 to 18.
7 . The urethane adhesive composition according to claim 1 , wherein n represents an integer of 10 to 16.
8 . The urethane adhesive composition according to claim 1 , wherein R represents hydrogen.
9 . The urethane adhesive composition according to claim 1 , wherein R represents an alkyl group.
10 . The urethane adhesive composition according to claim 9 , wherein the alkyl group has 1 to 6 carbon atoms.
11 . The urethane adhesive composition according to claim 9 , wherein the alkyl group has 1 to 3 carbon atoms.
12 . The urethane adhesive composition according to claim 9 , wherein the alkyl group is a methyl group.