Resin compositions
The invention pertains to a resin composition capable of absorbing UV light, comprising inorganic particulates and a resin containing as a polymerized unit an acrylate monomer. The composition of the invention can be formulated into a coating for a substrate so as to impart UV resistance and good weatherability to the coated substrate.
1. A composition for absorbing UV light, consisting essentially of
a) 0.01% to 20% by weight of inorganic particulates selected from the group consisting of zinc oxide, titanium dioxide, alumina, calcium sulfate, barium sulfate, calcium carbonate, and a mixture thereof,
b) 99.99% to 70% by weight of a binder consisting of a resin selected from the group consisting of (i) a resin formed from a monomer of Formula (I) with styrene and (ii) a resin formed from the monomer of Formula (I) with a tertiary carboxylic ester,
wherein R 1 is hydrogen or methyl; and R 2 is hydrogen, a C 6 -C 18 aromatic group, a C 1 -C 18 aliphatic group, or a hydroxyalkyl group of formula C n H 2n OH wherein n=2˜10, and c) 0 to 10% by weight of curing means for crosslinking the binder through chemical bonding of molecules thereof, wherein the particle size of said inorganic particulates ranges from 1 to 100 nanometers.
2. The composition of claim 1 , wherein the particle size of said inorganic particulates ranges from 20 to 50 nanometers.
3. The composition of claim 1 , wherein said monomer is selected from the group consisting of (meth)acrylic acid, methyl (meth)acrylate ethyl (meth)acrylate, butyl (meth)acrylate, isooctyl (meth)acrylate, cyclohexyl (meth)acrylate, and hydroxyethyl (meth)acrylate, and a mixture thereof.
4. A coating for a surface of a substrate, comprising the composition of claim 1 .
5. A method of coating a surface of a substrate, comprising applying the composition of claim 1 onto the surface of the substrate.
6. The method of claim 5 , wherein said substrate is metal, alloy, wooden article, plastic, polymeric film, or leather article.
7. The composition of claim 1 , wherein the composition does not contain an organic UV light absorbent.
8. The composition of claim 1 , wherein the resin is present in the composition in an amount of 99-90% by weight of the composition.
9. The composition of claim 8 , wherein the inorganic particulates are present in the composition in an amount of 1-5% by weight of the composition.
10. The composition of claim 9 , wherein the curing means is present in the composition in an amount of 1-5% by weight of the composition.
11. The composition of claim 10 , wherein the curing means consists of a polyisocyanate.
12. The composition of claim 1 , wherein the composition consists of components a), b) and c).
13. The composition of claim 1 , wherein the composition does not contain silicon dioxide particulates.