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1. WO2020115559 - CURABLE HEAT-SEAL ADHESIVES FOR BONDING POLYMERS

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[ EN ]

CLAIMS

What is claimed is:

1. A curable composition comprising:

a urethane (meth)acrylate oligomer having a number-average molecular weight of at least 6000 g/mol;

at least one mono(meth)acrylate monomer;

a multifunctional crosslinking monomer chosen from acrylate monomers, methacrylate monomers, or combinations thereof; and

an ethylene-vinyl acetate grafted terpolymer.

2. The curable composition of claim 1 , wherein the multifunctional crosslinking monomer is chosen from diacrylate monomers, dimethacrylate monomers, or combinations thereof.

3. The curable composition of claim 1 or 2, wherein the ethylene- vinyl acetate grafted terpolymer is an ethylene-vinyl acetate grafted with maleic anhydride.

4. The curable composition of any one of claims 1 to 3, wherein the at least one

mono(meth)acrylate monomer comprises:

at least one moderate-Tg mono(meth)acrylate having a glass transition temperature of from greater than 30 °C to 175 °C; and

at least one low-Tg mono(meth)acrylate having a glass transition temperature from -50 °C to 30 °C.

5. The curable composition of claim 4, wherein:

the at least one moderate-Tg mono(meth)acrylate has a glass transition temperature of from 50 °C to 70 °C; and

the at least one low-Tg mono(meth)acrylate has a glass transition temperature from -30 °C to -10 °C.

6. The curable composition of any one of claims 1 to 5, comprising:

from 20 wt.% to 50 wt.% urethane (meth)acrylate oligomer, based on the total weight of the curable composition;

from 40 wt.% to 75 wt.% mono(meth)acrylate monomer, based on the total weight of the curable composition;

from 1 wt.% to 5 wt.% multifunctional crosslinidng monomer, based on the total weight of the curable composition; and

from 1 wt.% to 10 wt.% ethylene- vinyl acetate grafted terpolymer, based on the total weight of the curable composition.

7. The curable composition of any one of claims 1 to 6, wherein:

the urethane (meth)acrylate oligomer is an aliphatic polyester urethane (meth)acrylate

oligomer;

the at least one mono(meth)acrylate monomer is selected from an isobornyl (meth)acrylate, a propoxylated tetrahydrafurfuryl (meth)acrylate, a cycloaliphatic mono(meth)acrylate, an octyldecyl (meth)acrylate, and combinations thereof;

the multifunctional crosslinking monomer comprises 1 ,4-butanediol methacrylate; and the ethylene-vinyl acetate grafted terpolymer is a random terpolymer of ethylene and vinyl acetate grafted with maleic anhydride.

8. The curable composition of any one of claims 1 to 7, comprising:

from 25 wt.% to 35 wt.% aliphatic polyester urethane (meth)acrylate oligomer, based on the total weight of the curable composition;

from 50 wt.% to 70 wt.% mono(meth)acrylate monomer selected from an isobornyl

(meth)acrylate, a propoxylated tetrahydrafurfuryl (meth)acrylate, a cycloaliphatic mono(meth)acrylate, an octyldecyl (meth)acrylate, and combinations thereof, based on the total weight of the curable composition;

from 1 wt.% to 3 wt.% 1,4-butanediol methacrylate, based on the total weight of the curable composition;

from 2 wt.% to 6 wt.% random terpolymer of ethylene and vinyl acetate grafted with maleic anhydride, based on the total weight of the curable composition.

9. The curable composition of any one of claims 1 to 8, further comprising at least one tackifying resin.

10. The curable composition of any one of claims 1 to 9, further comprising at least one photoinitiator

11. The curable composition of any one of claims 1 to 8, further comprising at least one tackifying resin and at least one photoinitiator.

12. The curable composition of claim 11, comprising:

from 20 wt.% to 50 wt.% urethane (meth)acrylate oligomer, based on the total weight of the curable composition;

from 40 wt.% to 75 wt.% mono(meth)acrylate monomer, based on the total weight of the curable composition;

from 0.01 wt.% to 10 wt.% tackifying resin, based on the total weight of the curable

composition;

from 1 wt.% to 5 wt.% multifunctional crosslinking monomer, based on the total weight of the curable composition;

from 1 wt.% to 10 wt.% photoinitiator, based on the total weight of the curable composition; and

from 1 wt.% to 10 wt.% ethylene- vinyl acetate grafted terpolymer, based on the total weight of the curable composition.

13. The curable composition of claim 11 or 12, comprising:

from 25 wt.% to 35 wt.% urethane (meth)acrylate oligomer, based on the total weight of the curable composition;

from 50 wt.% to 70 wt.% mono(meth)acrylate monomer, based on the total weight of the curable composition;

from 2 wt.% to 5 wt.% tackifying resin, based on the total weight of the curable composition; from 1 wt.% to 3 wt.% multifunctional crosslinking monomer, based on the total weight of the curable composition;

from 2 wt.% to 6 wt.% photoinitiator, based on the total weight of the curable composition; and

from 2 wt.% to 6 wt.% ethylene-vinyl acetate grafted terpolymer, based on the total weight of the curable composition.

14. The curable composition of any one of claims 11 to 13, wherein:

the urethane (meth)acrylate oligomer is an aliphatic polyester urethane (meth)acrylate

oligomer;

the at least one mono(meth)acrylate monomer is selected from an isobornyl (meth)acrylate, a propoxylated tetrahydrafurfuryl (meth)acrylate, a cycloaliphatic mono(meth)acrylate, an octyldecyl (meth)acrylate, and combinations thereof;

the multifunctional crosslinking monomer comprises 1 ,4-butanediol methacrylate; and the ethylene-vinyl acetate grafted terpolymer is a random terpolymer of ethylene and vinyl acetate grafted with maleic anhydride.

15. A bondable material comprising:

a substrate; and

a low-tack adhesive layer on a surface of the substrate, the low-tack adhesive layer formed by exposing a curable composition according to any one of claims 1 to 14 to curing by exposure to visible radiation, UV radiation, LED radiation, laser radiation, electron-beam radiation, peroxide, accelerator, or heat, to cure the curable composition.

16. The bondable material of claim 15, wherein the substrate is an ethylene-vinyl acetate foam.

17. A method for bonding a first substrate to a second substrate, the method comprising:

applying a curable composition according to any one of claims 1 to 14 to the first substrate; exposing the curable composition to visible radiation, UV radiation, LED radiation, laser radiation, electron-beam radiation, peroxide, accelerator, or heat to at least partially cure the curable composition and form a low-tack adhesive layer;

contacting the second substrate to the low-tack adhesive layer;

heating the low-tack adhesive layer to bond the first substrate to the second substrate and form a laminate.

18. The method of claim 17, wherein the first substrate is an ethylene- vinyl acetate foam and the second substrate is a nylon fabric.

19. The method of claim 17 or 18, wherein the first substrate is a sole of a shoe and the second substrate is an upper of a shoe.

20. A laminate prepared by the method according to any one of claims 17 to 19.

21. The laminate of claim 20, wherein the first substrate is an ethylene- vinyl acetate foam and the second substrate is a nylon fabric.

22. The laminate of claim 20 or 21, wherein the first substrate is a sole of a shoe and the second substrate is an upper of a shoe.