Methods for making elastomers, elastomer compositions and related elastomers

1. A method of making a high thickness elastomer, comprising:

(I) applying an actinic radiation curable composition to a substrate at a thickness of at least 50 mils;

(II) exposing the composition to actinic radiation to produce a cured film; and

(III) removing the film from the substrate,

wherein the elastomer thereby obtained is substantially free from uncured surface residue even if no oxygen inhibition mitigation technique is used in the method, and

wherein the composition comprises up to 70 percent by weight of (a)(1) and at least 30 percent by weight of at least one selected from the group consisting of (a)(2) and (a)(3) based on a total weight of (a)(1), (a)(2) and (a)(3), and (b) a photoinitiator,

wherein (a)(1) is a urethane (meth)acrylate polymer which is a reaction product of a composition comprising:

(i) an organic polyisocyanate,

(ii) a polyol having a number average molecular weight of from 600 to 4000 g/mol, and

(iii) at least one selected from the group consisting of:

(A) a hydroxyl-functional (meth)acrylate, and

(B) an unsaturated (meth) acrylate polyol based on at least one selected from the group consisting of a polyester, a polyether, a polythioether, a polyacetal, a polycarbonate, a dimer fatty alcohol and an esteramide, and having a number average molecular weight of 400 to 8000 g/mol,

at an isocyanate to hydroxyl equivalent ratio of from 0.5:1 to 1:0.5;

wherein (a)(2) is an allophanate urethane (meth)acrylate polymer; and

wherein (a)(3) is a lactone-containing (meth)acrylate polymer.

2. The method of claim 1 , wherein the composition comprises a reaction product of a composition comprising (a)(1)(i), (a)(1)(ii), and (a)(1)(iii)(B).

3. The method of claim 1 , wherein the urethane (meth)acrylate polymer (a)(1) is a tri- or higher functional urethane (meth)acrylate.

4. The method of claim 3 , wherein the polyol (a)(1)(ii) comprises a triol; and/or wherein the composition is substantially 100% solids.

5. The method of claim 1 ,

wherein the composition comprises the urethane (meth)acrylate polymer (a)(1), and at least one selected from the group consisting of the allophanate unsaturated urethane (meth)acrylate (a)(2) and the lactone-containing (meth)acrylate (a)(3),

wherein the allophanate unsaturated urethane (meth)acrylate (a)(2) is different from the urethane (meth)acrylate polymer (a)(1), and the lactone-containing (meth)acrylate (a)(3) is different from the urethane (meth)acrylate polymer (a)(1) and the allophanate unsaturated urethane (meth)acrylate (a)(2).

6. The method of claim 5 , wherein the polyol (a)(1)(ii) comprises a triol; and/or wherein the composition is substantially 100% solids.

7. The method of claim 1 , wherein the polyol (a)(1)( ii ) comprises a triol; and/or wherein the composition is substantially 100% solids.

8. A composition comprising:

(a) up to 70 percent by weight, based on the total weight of (a) and (b), of an unsaturated (meth)acrylate polymer or oligomer which is the reaction product of a composition comprising:

(i) an organic polyisocyanate,

(ii) a polyol having a number average molecular weight of from 600 to 4000 g/mol, and

(iii) at least one selected from the group consisting of:

(1) a hydroxyl-functional (meth)acrylate, and

(2) an unsaturated (meth)acrylate polyol based on at least one selected from the group consisting of a polyester, a polyether, a polythioether, a polyacetal, a polycarbonate, a dimer fatty alcohol and an esteramide, in each case with a number average molecular weight of 400 to 8000 g/mol,

at an isocyanate to hydroxyl equivalent ratio of from 0.5:1 to 1:0.5;

(b) at least 30 percent by weight, based on the total weight of the sum of (a) and (b), of at least one selected from the group consisting of:

(i) an allophanate unsaturated urethane (meth)acrylate, different from component (a); and

(ii) a lactone-containing (meth)acrylate different from (a) and (b)(i); and

(c) a photoinitiator.

9. The composition of claim 8 , wherein the polyol (a)(ii) comprises a triol.

10. The composition of claim 9 , wherein the triol comprises a polyester polyol.

11. The composition of claim 8 , wherein the composition is substantially 100% solids.