Reactive hot-melt adhesive
View Patent ↗The present technology provides a reactive hot-melt adhesive including a urethane prepolymer formed from a polyol and a polyisocyanate; and a thermoplastic poly (meth)acrylic resin; the polyol including a bifunctional polyol including polypropylene glycol and polyethylene glycol, a trifunctional polyol, and a polyester polyol having a glass transition temperature of from 20 to 60° C.
1. A reactive hot-melt adhesive comprising a urethane prepolymer formed from a polyol and a polyisocyanate; and a thermoplastic poly (meth)acrylic resin,
the polyol comprising a bifunctional polyol comprising polypropylene glycol and polyethylene glycol,
a trifunctional polyol, and
a polyester polyol having a glass transition temperature of from 20 to 60° C.
2. The reactive hot-melt adhesive according to claim 1 , wherein the bifunctional polyol further comprises polytetramethylene glycol.
3. The reactive hot-melt adhesive according to claim 1 , wherein
the glass transition temperature of the thermoplastic poly (meth)acrylic resin is from 40 to 80° C., and
the weight average molecular weight of the thermoplastic poly(meth)acrylic resin is from 20 thousand to 100 thousand.
4. The reactive hot-melt adhesive according to claim 1 , further comprising a reaction catalyst.
5. The reactive hot-melt adhesive according to claim 1 , wherein the amount of the trifunctional polyol forming the urethane prepolymer is from 5 to 40 parts by mass per 100 parts by mass of the urethane prepolymer.
6. The reactive hot-melt adhesive according to claim 1 , wherein the content of the thermoplastic poly (meth)acrylic resin is from 5 to 30 parts by mass per 100 parts by mass of the urethane prepolymer.
7. The reactive hot-melt adhesive according to claim 2 , wherein
the glass transition temperature of the thermoplastic poly (meth)acrylic resin is from 40 to 80° C., and
the weight average molecular weight of the thermoplastic poly(meth)acrylic resin is from 20 thousand to 100 thousand.
8. The reactive hot-melt adhesive according to claim 2 , further comprising a reaction catalyst.
9. The reactive hot-melt adhesive according to claim 2 , wherein the amount of the trifunctional polyol forming the urethane prepolymer is from 5 to 40 parts by mass per 100 parts by mass of the urethane prepolymer.
10. The reactive hot-melt adhesive according to claim 2 , wherein the content of the thermoplastic poly (meth)acrylic resin is from 5 to 30 parts by mass per 100 parts by mass of the urethane prepolymer.
11. The reactive hot-melt adhesive according to claim 3 , further comprising a reaction catalyst.
12. The reactive hot-melt adhesive according to claim 3 , wherein the amount of the trifunctional polyol forming the urethane prepolymer is from 5 to 40 parts by mass per 100 parts by mass of the urethane prepolymer.
13. The reactive hot-melt adhesive according to claim 3 , wherein the content of the thermoplastic poly (meth)acrylic resin is from 5 to 30 parts by mass per 100 parts by mass of the urethane prepolymer.
14. The reactive hot-melt adhesive according to claim 4 , wherein the amount of the trifunctional polyol forming the urethane prepolymer is from 5 to 40 parts by mass per 100 parts by mass of the urethane prepolymer.
15. The reactive hot-melt adhesive according to claim 4 , wherein the content of the thermoplastic poly (meth)acrylic resin is from 5 to 30 parts by mass per 100 parts by mass of the urethane prepolymer.
16. The reactive hot-melt adhesive according to claim 5 , wherein the content of the thermoplastic poly (meth)acrylic resin is from 5 to 30 parts by mass per 100 parts by mass of the urethane prepolymer.