UV curable conformal coating with moisture shadow cure

Details UV curable conformal coating with moisture shadow cure UV curable conformal coating with moisture shadow cure

1988-12-08

1990-09-11

Morgenstern, Norman

Stock material or miscellaneous articles

Structurally defined web or sheet

Continuous and nonuniform or irregular surface on layer or...

427 541, 428161, 4284744, 522 9, B32B 310, B32B 2708, B05D 306

Patent

active

049562215

ABSTRACT:
A conformal coating composition is made from a mixture of acrylamide functional polydimethylsiloxane, a methacrylate functional/dialkoxy polydiorganosiloxane, reactive diluent including isobornyl acrylate, cyclohexyl acrylate, and 2- ethylhexyl acrylate; a photoinitiator combination of 2-hydroxy- 2-methylphenylpropanone and 2-methyl-1-[4-(methylthio)phenyl]-2- morpholenopropanone, an amine including dimethylethanolamine and diisopropylethylamine, and an organic titantate. The composition has a viscosity of from 0.07 to 0.2 Pa.s at 25.degree. C. and cures by exposure to ultraviolet radiation and to atmospheric moisture, i.e. a dual curing composition. This composition cures too fast by exposure to ultraviolet radiation in the presence of nitrogen resulting in a distorted surface and therefore for coating printed circuit boards it is recommended that it be cured in air so that the rate of cure is reduced and no surface distortions are formed.

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patent: 4608270 (1986-08-01), Varaprath
patent: 4699802 (1987-10-01), Nakos

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