Laminating adhesive, laminate including the same, and method of making a laminate
View Patent ↗Disclosed is a method of making a laminate that includes a) preparing an adhesive composition, where the preparing includes combining a first part that includes (meth)acrylate functional, polyisocyanate prepolymer, and polyisocyanate monomer, the first part including at least 10% by weight isocyanate functional groups, and a second part that includes polyol, at least one of the first part and the second part includes photoinitiator, b) coating a first flexible substrate with the adhesive composition, c) exposing the adhesive composition to radiation to partially cure the adhesive composition, and d) contacting the adhesive composition with a second flexible substrate.
1. A method of making a laminate, said method comprising:
a) preparing an adhesive composition, said preparing comprising combining a first part comprising
a radiation polymerizable polyisocyanate prepolymer comprising (meth)acrylate functional, polyisocyanate prepolymer, and
polyisocyanate monomer,
said first part comprising at least 10% by weight isocyanate functional groups, and
a second part comprising polyol; and
b) coating a first flexible substrate with said adhesive composition.
2. The method of claim 1 further comprising exposing said adhesive composition to radiation to partially cure the adhesive composition.
3. The method of claim 1 , wherein said adhesive composition exhibits a viscosity of from 250 centipoise to 5000 centipoise at a temperature from 65° F. to 170° F.
4. The method of claim 1 , wherein said composition exhibits a pot life of at least 30 minutes.
5. The method of claim 1 , wherein said adhesive composition exhibits a lap shear strength of at least 25 g/in 2 after exposure to said radiation.
6. The method of claim 1 , wherein said adhesive composition exhibits a lap shear strength of at least 100 g/in 2 after exposure to said radiation.
7. The method of claim 1 , wherein said adhesive composition exhibits a peel force of at least 25 g/lineal inch.
8. The method of claim 1 , wherein said adhesive composition exhibits a destructive bond to said substrate.
9. The method of claim 1 , wherein said first part comprises from at least about 40% by weight to no greater than about 80% by weight said (meth)acrylate functional, polyisocyanate prepolymer and at least about 10% by weight said polyisocyanate monomer, and said second part comprises from about 70% by weight to about 100% by weight said polyol.
10. The method of claim 1 , wherein said first part comprises from at least about 40% by weight to no greater than about 90% by weight said (meth)acrylate functional, polyisocyanate prepolymer, and from at least about 10% by weight to no greater than about 60% by weight said polyisocyanate monomer.
11. The method of claim 1 further comprising contacting said adhesive composition with a second flexible substrate.
12. The method of claim 11 further comprising exposing said adhesive composition to radiation.
13. A method of making a laminate, said method comprising coating a first flexible substrate with a composition comprising (meth)acrylate functional, polyisocyanate prepolymer, at least 15% by weight polyisocyanate monomer, and polyol.
14. The method of claim 13 further comprising exposing said adhesive composition to radiation to partially cure said adhesive composition.
15. The method of claim 13 further comprising combining a first part comprising said (meth)acrylate functional, polyisocyanate prepolymer and said polyisocyanate monomer, and a second part comprising said polyol prior to said coating.
16. The method of claim 13 further comprising contacting said adhesive composition with a second flexible substrate.
17. The method of claim 16 further comprising exposing said adhesive composition to radiation.
18. A laminate prepared according to the method of claim 13 , said laminate comprising the reaction product of the adhesive composition of claim 13 , said adhesive composition exhibiting a destructive bond to said first substrate.