Moisture-curable reactive hot-melt adhesive composition and method for producing the same
A moisture-curable reactive hot-melt adhesive composition comprises: a urethane prepolymer having an isocyanate group, the urethane prepolymer being a reaction product of a polyol component comprising a polyester polyol, a polyether polyol and a polybutadiene polyol with an isocyanate component; and an antioxidant.
1. A moisture-curable reactive hot-melt adhesive composition, comprising:
a urethane prepolymer having an isocyanate group, the urethane prepolymer being a reaction product of a polyol component comprising a polyester polyol, a polyether polyol and a polybutadiene polyol with an isocyanate component, the polyester polyol comprising a crystalline polyester polyol, an amorphous polyester polyol having a number average molecular weight of 3000 or less and an amorphous polyester polyol having a number average molecular weight of 5000 or more; and
an antioxidant.
2. The moisture-curable reactive hot-melt adhesive composition according to claim 1 , wherein the polybutadiene polyol has 20% or more of a structural unit having a 1,2-vinyl bond and represented by the following formula (1)
3. The moisture-curable reactive hot-melt adhesive composition according to claim 1 , wherein a content of the polybutadiene polyol is 5 to 45 parts by mass based on a total amount of the polyol component of 100 parts by mass.
4. The moisture-curable reactive hot-melt adhesive composition according to claim 1 , wherein a content of the antioxidant is 0.05 to 5 parts by mass per 100 parts by mass of the urethane prepolymer having an isocyanate group.
5. A method for producing a moisture-curable reactive hot-melt adhesive composition comprising a urethane prepolymer having an isocyanate group and an antioxidant, the method comprising:
a step of reacting a polyol component comprising a polyester polyol, a polyether polyol and a polybutadiene polyol with an isocyanate component to obtain the urethane prepolymer having an isocyanate group, the polyester polyol comprising a crystalline polyester polyol, an amorphous polyester polyol having a number average molecular weight of 3000 or less and an amorphous polyester polyol having a number average molecular weight of 5000 or more.
6. The moisture-curable reactive hot-melt adhesive composition according to claim 2 , wherein a content of the polybutadiene polyol is 5 to 45 parts by mass based on a total amount of the polyol component of 100 parts by mass.
7. The moisture-curable reactive hot-melt adhesive composition according to claim 2 , wherein a content of the antioxidant is 0.05 to 5 parts by mass per 100 parts by mass of the urethane prepolymer having an isocyanate group.
8. The moisture-curable reactive hot-melt adhesive composition according to claim 3 , wherein the content of the antioxidant is 0.05 to 5 parts by mass per 100 parts by mass of the urethane prepolymer having an isocyanate group.
9. The moisture-curable reactive hot-melt adhesive composition according to claim 6 , wherein the content of the antioxidant is 0.05 to 5 parts by mass per 100 parts by mass of the urethane prepolymer having an isocyanate group.
10. The moisture-curable reactive hot-melt adhesive composition according to claim 1 , wherein the amorphous polyester polyol having a number average molecular weight of 5000 or more has a number average molecular weight in the range of 7000 to 8000.
11. The moisture-curable reactive hot-melt adhesive composition according to claim 1 , wherein a content of the polyester polyol is 40 to 70 parts by mass based on a total amount of the polyol component of 100 parts by mass.
12. The moisture-curable reactive hot-melt adhesive composition according to claim 1 , wherein a content of the polyether polyol is 10 to 30 parts by mass based on a total amount of the polyol component of 100 parts by mass.
13. The moisture-curable reactive hot-melt adhesive composition according to claim 1 , wherein the polybutadiene polyol has a number average molecular weight in the range of 1000 to 2800.
14. The moisture-curable reactive hot-melt adhesive composition according to claim 1 , wherein the amorphous polyester polyol having a number average molecular weight of 3000 or less has a number average molecular weight in the range of 500 to 3000, and the amorphous polyester polyol having a number average molecular weight of 5000 or more has a number average molecular weight in the range of 5000 to 9000.
15. The method according to claim 5 , wherein the amorphous polyester polyol having a number average molecular weight of 5000 or more has a number average molecular weight in the range of 7000 to 8000.
16. The method according to claim 5 , wherein a content of the polyester polyol is 40 to 70 parts by mass based on a total amount of the polyol component of 100 parts by mass.
17. The method according to claim 5 , wherein a content of the polyether polyol is 10 to 30 parts by mass based on a total amount of the polyol component of 100 parts by mass.
18. The method according to claim 5 , wherein the polybutadiene polyol has a number average molecular weight in the range of 1000 to 2800.
19. The method according to claim 5 , wherein the amorphous polyester polyol having a number average molecular weight of 3000 or less has a number average molecular weight in the range of 500 to 3000, and the amorphous polyester polyol having a number average molecular weight of 5000 or more has a number average molecular weight in the range of 5000 to 9000.