Ultraviolet curable conformal coatings
First Claim
1. An ultraviolet radiation curable conformal coating composition comprising the mixture:
- Component (A) which comprises a mixture of (1) about 40% to 80% by weight, of a urethane having a free isocyanate group;
(2) about 20% to 60% by weight of reactive acrylate diluents;
(3) from 0% to about 10% by weight, of UV photoinitiators;
(4) from 0% to 10%, by weight, of additives selected from adhesion promoters, pigments, dyes, flow control agents and their mixtures; and
Component (B) which comprises a mixture of (1) about 5% to 80% by weight, of an acrylate-epoxy resin which comprises an unsaturated epoxy oligomer having a molecular weight of from 2000 to 5000, where the epoxy in said oligomer is a bisphenol epoxy;
(2) about 1% to 10% by weight, of an acrylate-urethane oligomer;
(3) about 10% to 94% by weight of reactive acrylate monomers including acrylate monomer having a hydroxy functional group;
(4) from 0% to 10%, by weight, of UV photoinitiators; and
(5) from 0% to 10%, by weight, of additives selected from adhesion promoters, pigments, dyes, flow control agents and their mixtures;
with the proviso that photoinitiator be present in one or both components and that the total percentage weight, based on total composition weight, of said UV photoinitiators plus additives not be less than 1 percent and not exceed about 10 percent.
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Accused Products
Abstract
A two package UV curable conformal coating has been developed which possesses low moisture permeability and good electrical properties and provides a cure for shadowing of components on a printed wiring board. The conformal coating is a mixture of Component (A) which is a mixture of (1) from about 40 to 80% by weight, of a urethane having a free isocyanate group; (2) from about 20 to 60%, by weight, of reactive acrylate diluents; (3) from 0 to about 10% by weight of UV photoinitiators; and (4) from 0 to about 10% by weight of additives; and component (B) which is a mixture of (1) about 50 to 80% by weight of an acrylate-epoxy resin; (2) about 1 to 10% by weight of an acrylate-urethane oligomer; (3) about 10 to 94% by weight of reactive acrylate monomers; (4) from 0 to about 10%, by weight, of UV photoinitiators; and (5) from 0 to about 10% by weight of additives; with the proviso that the total weight percentage of said photoinitiators and additives not be less than 1 percent and not exceed about 10 percent. Components A and B may be mixed in equal parts, by weight, or in a 1 to 2 part ratio, by weight.
45 Citations
41 Claims
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1. An ultraviolet radiation curable conformal coating composition comprising the mixture:
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Component (A) which comprises a mixture of (1) about 40% to 80% by weight, of a urethane having a free isocyanate group;
(2) about 20% to 60% by weight of reactive acrylate diluents;
(3) from 0% to about 10% by weight, of UV photoinitiators;
(4) from 0% to 10%, by weight, of additives selected from adhesion promoters, pigments, dyes, flow control agents and their mixtures; andComponent (B) which comprises a mixture of (1) about 5% to 80% by weight, of an acrylate-epoxy resin which comprises an unsaturated epoxy oligomer having a molecular weight of from 2000 to 5000, where the epoxy in said oligomer is a bisphenol epoxy;
(2) about 1% to 10% by weight, of an acrylate-urethane oligomer;
(3) about 10% to 94% by weight of reactive acrylate monomers including acrylate monomer having a hydroxy functional group;
(4) from 0% to 10%, by weight, of UV photoinitiators; and
(5) from 0% to 10%, by weight, of additives selected from adhesion promoters, pigments, dyes, flow control agents and their mixtures;
with the proviso that photoinitiator be present in one or both components and that the total percentage weight, based on total composition weight, of said UV photoinitiators plus additives not be less than 1 percent and not exceed about 10 percent. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35, 36)
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37. An ultraviolet radiation curable composition consisting essentially of the mixture:
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Component (A) which consists essentially of a mixture of (1) about 40% to 80% by weight, of a urethane having a free isocyanate group consisting essentially of the reaction mixture of alcohols or polyols with one stoichiometric equivalent of excess polyisocyanate in the presence of an inhibiter, where the alcohols or polyols may possess acrylate functional groups;
(2) about 20% to 60% by weight of reactive acrylate diluents free of active hydrogen and containing no more than three acrylate functional groups;
(3) from 0% to about 10%, by weight, of UV photoinitiators;
(4) from 0% to 10%, by weight, of additives selected form adhesion promoters, pigments, dyes, flow control agents and their mixtures; andComponent (B) which comprises a mixture of (1) about 5% to 80% by weight, of an acrylate-epoxy resin which comprises an unsaturated epoxy oligomer having a molecular weight of from 2000 to 5000, where the epoxy in said oligomer is a bisphenol epoxy;
(2) about 1% to 10% by weight, of an acrylate-urethane oligomer;
(3) reactive acrylate monomers including from 10% to 50% by weight of acrylate monomer having a hydroxy functional group;
(4) from 0% to 10%, by weight, or UV photoinitiators; and
(5) from 0% to 10%, by weight, of additives selected from adhesion promoters, pigments, dyes, flow control agents and their mixtures;
with the proviso that photoinitiator be present in one or both components and that the total percentage weight, based on total composition weight, of said UV photoinitiators plus additives not be less than 1 percent and not exceed about 10 percent; and
where the weight ratio of Component (A);
Component (B) of from about 1;
1 to about 1;
2. - View Dependent Claims (38, 39)
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40. An ultraviolet radiation curable, low viscosity, conformal coating composition consisting essentially of the mixture:
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Component (A) which consists essentially of a mixture of (1) about 40% to 80% by weight, of a urethane having a free isocyanate group, where said urethane is a reaction mixture of hydroxy ethyl acrylate, toluene diisocyanate and an inhibitor;
(2) about 20% to 60% by weight of phenoxy ethyl acrylate;
(3) from 0% to about 10% by weight, of UV photoinitiators;
(4) from 0% to 10%, by weight, of additives selected from adhesion promoters, pigments, dyes, flow control agents and their mixtures; andComponent (B) which comprises a mixture of (1) about 5% to 80% by weight, of an acrylate-epoxy resin which comprises an unsaturated epoxy oligomer having a molecular weight of from 2000 to 5000, where the epoxy in said oligomer is a bisphenol epoxy;
(2) about 1% to 10% by weight, of an acrylate-urethane oligomer;
(3) about 10% to 94% by weight of reactive acrylate monomers from the group consisting of hydroxy propyl methacrylate, phenoxy ethyl acrylate, hexane diol diacrylate, and tetra ethylene glycol diacrylate;
(4) from 0% to 10%, by weight, of UV photoinitiators; and
(5) from 0% to 10%, by weight, of additives selected from adhesion promoters, pigments, dyes, flow control agents and their mixtures;
with the proviso that photoinitiator be present in one or both components and that the total percentage weight, based on total composition weight, of said UV photoinitiators plus additives not be less than 1 percent and not exceed about 10 percent;
where the viscosity is in the range of 200 cps. to 300 cps. at room temperature, and where the weight ratio of Component (A);
Component (B) of from about 1;
1 to about 1;
2. - View Dependent Claims (41)
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Specification