Abrasion resistant coatings comprising silicon dioxide dispersions

Claim 2

A coating composition curable to an abrasion and weather resistant coating comprising a non-aqueous dispersion of colloidal silicon dioxide particles of diameters less than 100 millimicrometers in a protic group-­substituted ester or amide of acrylic or methacrylic acid.

Claim 3

The coating composition of Claim 1 wherein the colloidal silicon dioxide is present at a concentration of 30 to 70 percent by weight and the protic group-­substituted ester or amide is present at a concentration of 70 to 30 percent by weight and a degradation resistance improving amount of an ultraviolet radiation stabilizer.

Claim 4

The coating composition of Claim 1 wherein the protic group of the protic group-substituted ester or amide of acrylic or methacrylic acid is selected from the group consisting of -OH, -COOH, -CONHR³, -COONH₄, -SH, -NHR³, -SO₃H, -SO₃NH₄, -PO(ONH₄) in which R³ is hydrogen or an alkyl group having 1 to 4 carbon atoms.

Claim 5

The coating composition of Claim 1 wherein the protic group-substituted ester or amide of acrylic acid is one or more compounds having the general formula: wherein R is hydrogen, a lower alkyl group having 1 to 4 carbon atoms or halogen; X is -0- or -NHR¹ in which R¹ is hydrogen or a lower alkyl group having 1 to 4 carbon atoms; R¹ is a polyvalent saturated linear, branched, or cyclic aliphatic group having carbon, hydrogen, and optionally ether oxygen atoms and -NHCO- group and a molecular weight of 14 to 1000 and a valence of m+n; R² is a polyvalent saturated linear, branched or cyclic aliphatic group having carbon, hydrogen and optionally ether oxygen atoms and a molecular weight of 14 to 1000 and a valence of m+n; m and n are independently integers having a value of one to five; and

Claim 6

Y is a protic functional group capable of forming a hydrogen bond with lower aliphatic alcohols and with the silanol group of silanol group containing compounds.

Claim 7

Y is a protic functional group capable of forming a hydrogen bond with lower aliphatic alcohols and with the silanol group of silanol group containing compounds.

Claim 8

The coating composition of Claim 2 wherein the protic group-substituted ester or amide of acrylic acid is one or more compounds having the general formula: wherein R is hydrogen, a lower alkyl group or halogen; R² is a polyvalent saturated linear, branched or cyclic aliphatic group having carbon, hydrogen and optionally ether oxygen atoms and a molecular weight of 14 to 1000 and a valence of m+n; m is an integer having a value of one to five; and n is an integer having a value of one to five.

Claim 9

The composition of Claim 5 wherein the protic group-substituted ester or amide of acrylic or methacrylic acid present in the mixture is 20 to 85 weight percent of the total weight of both protic group substituted and unsubstituted ester or amide of acrylic or methacrylic acid and the ester or amide of acrylic or methacrylic acid unsubstituted by a protic group present in the mixture is 80 to 15 weight percent of the total weight of both protic group-substituted and unsubstituted ester or amide of acrylic or methacrylic acid.

Claim 10

A coating composition comprising by weight: a) 5-75% substantially water-free colloidal silica, b) 5-95% acryloyl monomer, of which at least 5% of the total composition comprises a polyacryloyl monomer, c) 0.1 to 10% of an initiator comprising a free radical photoinitiator system, and d) 0-25% of a compatible filler resin.

Claim 11

A coating composition comprising by weight: a) 5-75% substantially water-free colloidal silica, b) 5-95% acryloyl monomer, of which at least 5% of the total composition comprises a polyacryloyl monomer, c) 0.1 to 10% of an initiator comprising a free radical photoinitiator system, and d) 0-25% of a compatible filler resin.

Claim 12

The composition of claim 1 wherein there is 0.1 to 2.5 parts by weight of colloidal silica to one part by weight of polyethylenically-unsaturated monomer.

Claim 13

The composition of claim 2 further comprising a polyethylenically unsaturated crosslinking agent in an amount sufficient to effect crosslinking of the composition.

Claim 14

The composition of claim 1 wherein the polyacryloyl monomer is a polyfunctional acrylate monomer having the general formula: wherein R is hydrogen, halogen, lower alkyl group of 1 to 3 carbon atoms, or phenyl; R¹ is a polyvalent organic group having a valance of n that is the residue of an organic polyol having n hydroxyl groups that remain after the removal of n hydroxyl groups, the organic polyol being selected from saturated linear, branched, and cyclic aliphatic polyols having 2 to 10 carbon atoms and optionally one to three catenary (i.e., O backbone) oxygen atoms or -CO- groups and from aromatic polyols having 6 to 12 carbon atoms; and n is an integer having a value of 2 to 6.

Claim 15

A coated substrate comprising a substrate having adhered to at least one surface thereof a crosslinked polymeric coating derived from the coating composition of claim 7.