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Humidity- and salt-resistant electronic component
| Details |
Inventors: Lucey, Michael F.;
Assignee: Sprague Electric Company (North Adams, MA)
Primary Examiner: Newsome; John H.
Assistant Examiner:
Attorney, Agent or Firm: Connolly and Hutz
An electronic component is coated with an ultraviolet light cured composition to make it humidity and salt water resistant. The composition contains a urethane, at least one acrylate, a wet adhesion monomer, a photoinitiator, and optionally a thixotropic agent. |
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DETAILED DESCRIPTION What is claimed is: 1.
An electronic component coated with an ultraviolet light cured coating comprising a urethane, a triacrylate-tetraacrylate blend, a photoinitiator, and a wet adhesion monomer chosen from the group of allylic and acrylic ureides, said coating providing resistance to humidity and to salt water.
2.
A component according to claim 1 wherein a thixotropic agent is present.
3.
A component according to claim 2 wherein 0 to 4 wt% thixotrope is used.
4.
A component according to claim 1 wherein said urethane is an aliphatic acrylic urethane, and at least one acrylate chosen from the group of mono-acrylates and diacrylates is present in addition to the triacrylate-tetraacrylate blend.
5.
A component according to claim 4 wherein a monoacrylate and a triacrylate-tetraacrylate blend are used.
6.
A component according to claim 5 wherein said urethane is an aliphatic acrylic urethane, said monoacrylate is ethoxyethoxyethyl monoacrylate, and said triacrylate-tetraacrylate blend is pentaerythritol triacrylate-tetraacrylate blend.
7.
A component according to claim 6 wherein the amount of said urethane is 50 to 70 wt%, the amount of said monoacrylate is 0 to 33 wt%, the amount of said triacrylate-tetraacrylate blend is 5 to 8 wt%, the amount of said photoinitiator is about 1 wt% and the amount of said wet adhesion monomer is about 1 wt%.
8.
A component according to claim 4 wherein a diacrylate and a triacrylate-tetraacrylate blend are used.
9.
A component according to claim 8 wherein said urethane is an aliphatic acrylic urethane, said diacrylate is tetraethyleneglycol diacrylate, and said triacrylate-tetraacrylate blend is pentaerythritol triacrylate-tetraacrylate blend.
10.
A component according to claim 9 wherein the amount of said urethane is 50 to 70 wt%, of said diacrylate is 5 to 40 wt%, of said triacrylate-tetraacrylate blend is 5 to 40 wt%, of said wet adhesion monomer is 0.
5 to 3 wt%, and of said photoinitiator is 0.
5 to 1 wt%.
11.
A component according to claim 10 wherein the amount of said urethane is 70 wt%, of said diacrylate is 16
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