SUNLIGHT CURABLE COATING COMPOSITIONS
First Claim
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1. A liquid, curable coating composition comprising in admixture:
- (a) one or more polyurethane film-forming polymers having the formula
C-(D-[-(R-D)n-(P-D)m-]xE)k-Cwherein;
i) D is a diisocyanate group,ii) R is one or more diol or triol groups having a molecular weight less than or equal to 500 Daltons;
iii) P is one or more oligomeric diol groups having a molecular weight of from about 500 Daltons to about 3000 Daltons;
iv) E is a urea group having a molecular weight less than or equal to 500 Daltons;
v) C is a monohydroxyl functional acrylate group or methacrylate group;
wherein the equivalent ratio of equivalent ratio of (i) to (ii) is less than 1.5;
1; and
the equivalent ratio of (i) to (iii) is greater than 15;
1;
n=20 to 450, m=0 to 5, x=1 to 10, and k=1 to 10;
b) an alcohol solubilizer;
c) a non-alcohol solvent;
(d) a photoinitiator in an amount sufficient to polymerize the polyurethane film-forming polymers when exposed to light energy having a wavelength of 395 nm or above at an energy level of about 1 J/cm2 or more.
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Abstract
A coating composition capable of curing to a high hardness by exposure to sunlight. More particularly, the coating composition comprises a high molecular weight polyurethane (meth)acrylate or methacrylate dissolved in one or more non-alcohol solvent, a visible light photoinitiator, and an alcohol solubilizer.
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Citations
20 Claims
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1. A liquid, curable coating composition comprising in admixture:
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(a) one or more polyurethane film-forming polymers having the formula
C-(D-[-(R-D)n-(P-D)m-]xE)k-Cwherein; i) D is a diisocyanate group, ii) R is one or more diol or triol groups having a molecular weight less than or equal to 500 Daltons; iii) P is one or more oligomeric diol groups having a molecular weight of from about 500 Daltons to about 3000 Daltons; iv) E is a urea group having a molecular weight less than or equal to 500 Daltons; v) C is a monohydroxyl functional acrylate group or methacrylate group; wherein the equivalent ratio of equivalent ratio of (i) to (ii) is less than 1.5;
1; and
the equivalent ratio of (i) to (iii) is greater than 15;
1;
n=20 to 450, m=0 to 5, x=1 to 10, and k=1 to 10;b) an alcohol solubilizer; c) a non-alcohol solvent; (d) a photoinitiator in an amount sufficient to polymerize the polyurethane film-forming polymers when exposed to light energy having a wavelength of 395 nm or above at an energy level of about 1 J/cm2 or more. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17)
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18. A method of forming a substantially tack-free coating which comprises:
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I) forming a liquid, curable coating composition comprising in admixture; (a) one or more polyurethane film-forming polymers having the formula
C-(D-[-(R-D)n-(P-D)m-]xE)k-Cwherein; i) D is a diisocyanate group, ii) R is one or more diol or triol groups having a molecular weight less than or equal to 500 Daltons; iii) P is one or more oligomeric diol groups having a molecular weight of from about 500 Daltons to about 3000 Daltons; iv) E is a urea group having a molecular weight less than or equal to 500 Daltons; v) C is a monohydroxyl functional acrylate group or methacrylate group; wherein the equivalent ratio of equivalent ratio of (i) to (ii) is less than 1.5;
1; and
the equivalent ratio of (i) to (iii) is greater than 15;
1;
n=20 to 450, m=0 to 5, x=1 to 10, and k=1 to 10;b) an alcohol solubilizer; c) a non-alcohol solvent; (d) a photoinitiator in an amount sufficient to polymerize the polyurethane film-forming polymers when exposed to light energy having a wavelength of 395 nm or above at an energy level of about 1 J/cm2 or more; II) applying the coating composition onto a substrate following by evaporating the non-alcohol solvent and alcohol solubilizer to form substantially tack-free coating; III) exposing the composition resulting from step II) to light energy having a wavelength of 395 nm or above at an energy level of about 1 J/cm2 or more. - View Dependent Claims (19, 20)
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Specification