Opaque waterborne UV scratch resistant coatings
View Patent ↗A coating composition includes a UV curable film forming resin; a thixotropic and/or pseudoplastic anti-settling agent selected from at least one of an amine salt of a synthetic wax, a microcrystalline cellulose compound (MCC), a urea urethane, or a urethane enzymatically modified starch; a mar/scratch resistant additive selected from at least one of a mineral abrasive, glass particles, and ceramic particles; and water.
1. A coating composition, comprising:
an ultraviolet (UV) curable film forming resin, wherein the film forming resin comprises a water dispersible or a latex polymer, wherein the polymer is selected from at least one of polyurethane polymers, acrylic polymers and combinations thereof, and wherein the polymers have a functional group selected from at least one of acetoacetyl, vinyl and (meth)acryl;
about 0.5% by weight to about 5.0% by weight of a colloidal microcrystalline cellulose compound (MCC);
about 5 wt % to about 80 wt % of at least one of a mineral abrasive, silica oxide, and glass particles;
a photoinitiator; and
water.
2. The coating composition of claim 1 , wherein the composition further comprises an ethylenically unsaturated compound with a functional group selected from at least one of (meth)acryl, vinyl, vinyl ether, and (meth)allyl ether.
3. The coating composition of claim 2 , wherein the ethylenically unsaturated compound is multifunctional.
4. The coating composition of claim 3 , wherein the (meth)acryl functional compound is a monomer selected from the group consisting of isobornyl (meth)acrylate, isodecyl (meth)acrylate, phenoxyethyl (meth)acrylate, trimethylolpropane tri(meth)acrylate, trimethylolpropane ethoxylate tri(meth)acrylate, tripropylene glycol di(meth)acrylate, hexanediol di(meth)acrylate, tetrahydrofurfuryl (meth)acrylate, beta-carboxyethyl (meth)acrylate, bisphenol A ethoxylate di(meth)acrylate, ethoxylated neopentyl glycol di(meth)acrylate, propoxylated neopentyl glycol di(meth)acrylate, di-(trimethyolpropane tetra (meth)acrylate), pentaerythritol tri(meth)acrylate, pentaerythritol tetra(meth)acrylate, and mixtures thereof.
5. The coating composition of claim 1 , wherein the acrylic polymer comprises vinyl functionality.
6. The coating composition of claim 5 , wherein the acrylic polymer comprises a copolymer of an acrylic monomer and a styrene monomer.
7. The coating composition of claim 1 , wherein the mineral abrasive is Al 2 O 3 .
8. The coating composition of claim 1 , wherein the photoinitiator comprises benzophenone, 4-methylbenzophenone, benzoyl benzoate, phenylacetophenones, 2,2-dimethoxy-2-phenylacetophenone, alpha, alpha -diethoxyacetophenone, hydroxycyclo-hexylphenylketone, 2-hydroxy-2-methyl-1-phenylpropan-1-one, bis-(2,6-dimethoxybenzoyl)-2,4,4-trimethylpentyl phosphine oxide, 2-hydroxy-2-methyl-1-phenylpropan-1-one, 2-hydroxy-2-methyl-1-phenylpropan-1-one, 2,4,6-trimethylbenzoyl -diphenylphosphine oxide, or combinations thereof.
9. A method of coating a substrate, the method comprising applying the coating composition of claim 1 to a substrate and allowing the coating composition to harden.
10. A coating on a substrate prepared by the method of claim 9 .
11. A coating composition, comprising:
an ultraviolet (UV) curable film forming resin, wherein the film forming resin comprises a water dispersible or a latex polymer, wherein the polymer is selected from at least one of polyurethane polymers, acrylic polymers and combinations thereof, and wherein the polymers have a functional group selected from at least one of acetoacetyl, vinyl and (meth)acryl;
an ethylenically unsaturated compound comprising multiple (meth)acryl functional groups;
about 0.5% by weight to about 5.0% by weight of a colloidal microcrystalline cellulose compound (MCC);
about 5 wt % to about 80 wt % of a mar/scratch resistant additive selected from at least one of a mineral abrasive and glass particles;
a photoinitiator; and
water.
12. The coating composition of claim 11 , wherein the mineral abrasive comprises metal oxide particles.