U.V. Curable composition

Claim 2

A.U.V. curable coating composition comprising an acrylated or methacrylated oligomer in a concentration of from 30 to 70 weight percent of the composition, a photoinitiator in a concentration of from 1 to 12 weight percent of the composition and a monomer that is a mixture of an acrylate or methacrylate of an alkoxylated polyol having an average functionality of 2 or greater and a monofunctional ethylenically unsaturated compound having a single terminal ethylenic group, each in a concentration of from 5 to 35 percent of the composition.

Claim 3

The composition of claim 1 wherein the acrylated or methacrylated oligomer is selected from the group of acrylated or methacrylated epoxies, polyesters, polyethers, polyurethanes and mixtures thereof.

Claim 4

The composition of claim 2 where the oligomer is an aryloxyalkyl acrylate conforming to the formula: ##STR2## wherein X may be methylene, an alkyl-substituted methylene group, a dialkyl-substituted methylene group, a carbonyl group, a sulfide, a sulfoxide, a sulfone, an amine, an alkyl-substituted amine, and an alkalene ether wherein each alkyl group of each alkyl substituted group has from 1 to 8 carbon atoms, or any combination thereof; Y is thyl, lower alkyl or hydroxyalkyl where each alkyl group has up to 8 carbon atoms; A is an unsaturated acryloxy group having from 3 to 18 carbons; n is an integer of from 0 through 20; m is 0 or 1; and p is 0 or 1.

Claim 5

The composition of claim 2 where the alkoxylated acrylate or methacrylate conforms to the structural formula: [CH.sub.2 ═CRCO.sub.2 ((CH.sub.2).sub.m O.sub.p ].sub.x Y where R is hydrogen or methyl; m is a positive integer of from 1 to 4; p is a positive number of 1 or greater; Y is the residue of a polyol having at least z hydroxyl groups where z is at least 3; and x is at least 2, but not greater than z.

Claim 6

The composition of claim 4 where x and z are each 3.

Claim 7

The composition of claim 4 where m is 2.

Claim 8

The composition of claim 4 where m is 3.

Claim 9

The composition of claim 4 where the alkoxylated acrylate or methacrylate is the reaction product of propoxylated trimethylol propane and acrylic acid.

Claim 10

The composition of claim 4 where the alkoxylated acrylate or methacrylate is the reaction product of ethoxylated trimethylol propane and acrylic acid.

Claim 11

The composition of claim 4 where the ethylenically unsaturated compound is an alkyl acrylate or methacrylate.

Claim 12

The composition of claim 10 where the compound has an aliphatic C 4 to C 10 group.

Claim 13

The composition of claim 11 where the compound is a cycloalkyl acrylate.

Claim 14

The composition of claim 11 where the compound is selected from the group of 2-ethylhexyl acrylate, cyclohexyl acrylate, dicyclopentyl methacrylate, isodecyl acrylate and n-vinyl pyrrolidone.

Claim 15

The composition of claim 1, 3 or 10 as a cured coating over a substrate.

Claim 16

The composition of claim 14 where the substrate is a printed circuit.

Claim 17

A U.V. curable solder mask composition comprising an acrylated or methacrylated oligomer in a concentration of from 30 to 70 weight percent of the composition, a photoinitiator in a concentration of from 1 to 12 weight percent of the composition, a monomer that is a mixture of an acrylate or methacrylate of an alkoxylated polyol having an average functionality of 2 or greater and a monofunctional ethylenically unsaturated compound having a single terminal ethylenic group, each in a concentration of from 5 to 35 percent of the composition and a filler where at least 50 percent of the particles are elongated in a concentration of from 10 to 70 weight percent of the other components of the composition.

Claim 18

A U.V. curable solder mask composition comprising an acrylated or methacrylated oligomer in a concentration of from 30 to 70 weight percent of the composition, a photoinitiator in a concentration of from 1 to 12 weight percent of the composition, a monomer that is a mixture of an acrylate or methacrylate of an alkoxylated polyol having an average functionality of 2 or greater and a monofunctional ethylenically unsaturated compound having a single terminal ethylenic group, each in a concentration of from 5 to 35 percent of the composition and a filler where at least 50 percent of the particles are elongated in a concentration of from 10 to 70 weight percent of the other components of the composition.

Claim 19

The composition of claim 16 where the acrylated or methacrylated oligomer is selected from the group of acrylated or methacrylated epoxies, polyester, polyethers, polyurethanes and mixtures thereof.

Claim 20

The composition of claim 17 where the oligomer is an aryloxyalkyl acrylate conforming to the formula: ##STR3## wherein X is methylene, an alkyl-substituted methylene group, a dialkyl-substituted methylene group, a carbonyl group, a sulfide, a sulfoxide, a sulfone, an amine, an alkyl-substituted amine, or an alkalene ether, wherein the alkyl group of each alkyl substituted group has from 1 to 8 carbon atoms, or any combination thereof; Y is thyl, lower alkyl or hydroxyalkyl, where each alkyl group has up to 8 carbon atoms; A may be an unsaturated acryloxy group having from 3 to 18 carbons; n is 0 through 20; m is 0 or 1; and p is 0 or 1.

Claim 21

The composition of claim 17 the alkoxylated acrylate or methacrylate conforms to the structural formula: [CH.sub.2 ═CRCO.sub.2 ((CH.sub.2).sub.m O.sub.p ].sub.x Y where R is hydrogen or methyl; m is a positive integer of from 1 to 4; p is a positive number of 1 or greater; Y is the residue of a polyol having at least z hydroxyl groups where z is at least 3; and x is at least 2, but not greater than z.

Claim 22

The composition of claim 19 where x and z are each 3.

Claim 23

The composition of claim 19 where m is 2.

Claim 24

The composition of claim 19 where m is 3.

Claim 25

The composition of claim 19 where the alkoxylated acrylate or methacrylate is the reaction product of propoxylated trimethylol propane and acrylic acid.

Claim 26

The composition of claim 19 where the alkoxylated acrylate or methacrylate is the reaction product of ethoxylated trimethylol propane and acrylic acid.

Claim 27

The composition of claim 19 the ethylenically unsaturated compound is an alkyl acrylate or methacrylate.

Claim 28

The composition of claim 25 where the compound has an aliphatic C 4 to C 10 group.

Claim 29

The composition of claim 26 where the compound is selected from the group of 2-ethylhexyl acrylate, cyclohexyl acrylate, dicyclopentyl methacrylate, isodecyl acrylate and n-vinyl pyrrolidone.

Claim 30

The composition of claim 19 where the filler comprises particles having an average aspect ratio of at least 2 to 1.

Claim 31

The composition of claim 28 where the ratio is at least 4 to 1.

Claim 32

The composition of claim 28 where the filler is platy, acicular or fibrous.

Claim 33

The composition of claim 28 where the filler is selected from the group of talc, micas and mixtures thereof.

Claim 34

An article of manufacture comprising a substrate having the composition of claims 16 or 19 as a cured coating thereover.