Photopolymerizable compositions used in electronics

Method of preparing an UV curable coating composition useful for coating electronic components comprising the following steps:

• (a) selecting one of either a monomer selected from the group consisting of monofunctional vinyl ester monomers or a prepolymer selected from the group consisting of monofunctional vinyl ester resins and multifunctional vinyl ester resins;
• (b) admixing with the monomer or prepolymer a filler;
• (c) admixing with the mixture at least two surface active agents having a molecular weight greater than or equal to about 227 wherein one of the surface active agents has a pH greater than or equal to 7 and the other surface active agent has a pH less than or equal to 7 where the basic surface active agent disperses filler having a pH less than or equal to 7 and the acidic surface active agent disperses filler having a pH greater than or equal to 7;
• and
• (d) admixing with the mixture a photoinitiator for polymerizing the monomer or prepolymer.

Improved composition capable of being UV cured and suitable for use as a printing ink comprising:

• (a) only one of either a monomer selected from the group consisting of monofunctional vinyl ester monomers selected from the group consisting of acrylate and methacrylate monomers, and multifunctional vinyl ester monomers selected from the group consisting of acrylate and methacrylate monomers or a prepolymer selected from the group consisting of monofunctional vinyl ester resins and multifunctional ester resins;
• (b) a photoinitiator;
• (c) a pigment;
• and
• (d) at least one surface active agent having a molecular weight greater than or equal to about 227;
• wherein one of the surface active agent or the pigment has a pH greater than or equal to 7 and the other of the surface active agent or pigment has a pH less than or equal to 7.

A process for preparing a cured coating layer on an electrical component comprising the steps of:

• ,
• (a) preparing a coating composition comprising:
• (1) only one of a monomer selected from the group consisting of monofunctional vinyl ester monomers selected from the group consisting of acrylate and methacrylate monomers, and multifunctional vinyl ester monomers selected from the group consisting of acrylate and methacrylate monomers;
• or a prepolymer selected from the group consisting of monofunctional ester resins and multifunctional ester resins;
• (2) a photoinitiator;
• (3) a filler;
• and
• (4) at least one surface active agent having a molecular weight greater than or equal to about 227;
• wherein one of the surface active agent or the filler has a pH greater than or equal to 7 and the other of the surface active agent or the filler has a pH less than or equal to 7 such that the dispersion of the filler in the composition is enhanced and relative high loading of filler in the composition is obtainable;
• (b) coating a desired electrical component with the said composition;
• and
• (c) exposing the coating to actinic radiation at a wavelength within the ultraviolet and visible spectral regions or electron beam irradiation and for a period of time sufficient to cure the coating.

Actinic radiation curable composition suitable for use in coating electronic components and as a printing ink comprising:

• (a) only one of either a monomer selected from the group consisting of monofunctional vinyl monomers and multifunctional vinyl monomers or a prepolymer selected from the group consisting of monofunctional vinyl resins and multifunctional vinyl resins;
• (b) a photoinitiator;
• (c) a first filler having a pH of 7 and a second filler having a pH greater than 7;
• and
• (d) a first surface active agent having a pH greater than or equal to 7 and a second surface active agent having a pH less than 7 such that dispersion of the filler in the composition is enhanced and relative high loading of filler in the composition is obtainable, the surface active agents having a molecular weight greater than or equal to about 227.

Actinic radiation curable composition suitable for use in coating electronic components and as a printing ink comprising:

• (a) a monomer selected from the group consisting of monofunctional vinyl monomers and multifunctional vinyl monomers:
• (b) a prepolymer selected from the group consisting of monofunctional vinyl resins and multifunctional vinyl resins;
• (c) a photoinitiator;
• (d) a filler;
• and
• (e) a first surface active agent having a pH greater than 7 and a second surface active agent having a pH less than 7 such that dispersion of the filler in the composition is enhanced and relative high loading of filler in the composition is obtainable, the surface active agents having a molecular weight greater than or equal to about 227.

Actinic radiation curable composition suitable for use in coating electronic components and as a printing ink comprising:

• (a) a monomer selected from the group consisting of monofunctional vinyl monomers and multifunctional vinyl monomers;
• (b) a prepolymer selected from the group consisting of monofunctional vinyl resins and multifunctional vinyl resins;
• (c) a photoinitiator;
• (d) a first filler having a pH of 7 and a second filler having a pH greater than 7;
• and
• (e) a first surface active agent having a pH greater than or equal to 7 and a second surface active agent having a pH less than 7 such that dispersion of the filler in the composition is enhanced and relative high loading of filler in the composition is obtainable, the surface active agents having a molecular weight greater than or equal to about 227.

Actinic radiation curable composition suitable for use in coating electronic components and as a printing ink comprising:

• (a) only one of either a monomer selected from the group consisting of monofunctional vinyl monomers and multifunctional vinyl monomers or a prepolymer selected from the group consisting of monofunctional vinyl resins and multifunctional vinyl resins;
• (b) a photoinitiator;
• (c) a filler;
• and
• (d) one surface active agent having a molecular weight greater than or equal to about 227;
• wherein one of the surface active agent or the filler has a pH greater than or equal to 7 and the other of the surface active agent or the filler has a pH less than or equal to 7 such that dispersion of the filler in the composition is enhanced and relative high loading of filler in the composition is obtainable.

Actinic radiation curable composition suitable for use in coating electronic components and as a printing ink comprising:

• (a) a monomer selected from the group consisting of monofunctional vinyl monomers and multifunctional vinyl monomers;
• (b) a prepolymer selected from the group consisting of monofunctional vinyl resins and multifunctional vinyl resins;
• (c) a photoinitiator;
• (d) a filler;
• and
• (e) one surface active agent having a molecular weight greater than or equal to about 227;
• wherein one of the surface active agent or the filler has a pH greater than or equal to 7 and the other of the surface active agent or the filler has a pH less than or equal to 7 such that dispersion of the filler in the composition is enhanced and relative high loading of filler in the composition is obtainable.