Reactive hot-melt adhesive composition, and bonded body and method for producing same
Disclosed is a reactive hot-melt adhesive composition, containing: a urethane prepolymer having a polymer chain including a structural unit derived from polyol and a structural unit derived from polyisocyanate, and an isocyanate group as a terminal group of the polymer chain; and a functional group protection type silane coupling agent.
1. A reactive hot-melt adhesive composition, comprising:
a urethane prepolymer having a polymer chain including a structural unit derived from polyol and a structural unit derived from polyisocyanate, and an isocyanate group as a terminal group of the polymer chain, wherein the polyol comprises polyester polyol and a content of polyester polyol is at least 70 parts by mass with respect to a total amount of 100 parts by mass of polyol; and
a functional group protection type silane coupling agent.
2. The reactive hot-melt adhesive composition according to claim 1 ,
wherein a content of the functional group protection type silane coupling agent is 0.4 to 5 parts by mass with respect to a total amount of 100 parts by mass of the urethane prepolymer.
3. The reactive hot-melt adhesive composition according to claim 1 ,
wherein the polyester polyol comprises two or more types of polyester polyols.
4. The reactive hot-melt adhesive composition according to claim 1 ,
wherein a viscosity of the adhesive composition at 120° C., measured by a rotation viscosimeter, is 5 Pa·s or less.
5. The reactive hot-melt adhesive composition according to claim 1 ,
wherein a viscosity of the adhesive composition at 120° C., measured by a rotation viscosimeter, is 4 Pa·s or less.
6. The reactive hot-melt adhesive composition according to claim 5 ,
wherein the polyester polyol comprises two or more types of polyester polyols.
7. The reactive hot-melt adhesive composition according to claim 1 ,
wherein a viscosity of the adhesive composition at 120° C., measured by a rotation viscosimeter, is 3.5 Pa·s or less.
8. A bonded body, comprising:
a first adherend;
a second adherend; and
a hardened product of the reactive hot-melt adhesive composition according to claim 1 , for the first adherend and the second adherend to adhere to each other.
9. The bonded body according to claim 8 ,
wherein at least one of the first and second adherends comprises a polyamide base material.
10. A method for producing a bonded body, comprising:
forming an adhesive layer by melting the reactive hot-melt adhesive composition according to claim 1 to be applied to a first adherend;
obtaining a bonded body precursor by disposing a second adherend on the adhesive layer and by compressing the second adherend; and
hardening the adhesive layer in the obtained bonded body precursor.
11. The method for producing a bonded body according to claim 10 ,
wherein at least one of the first and second adherends comprises a polyamide base material.