UV CURABLE CONFORMAL COATING WITH IMPROVED LOW TEMPERATURE PROPERTIES

摘要

Conformal coating compositions which contain acrylated urethane oligomer, aliphatic monofunctional acrylate esters or a polybutadiene diacrylate or a polyoxyalkylated diacrylate or a monofunctional acryalte of the formula which has a viscosity in the range of 0.1 to 0.2 Pa·s, isobornyl acrylate or isobornyl methacrylate, a photo­initiator, and polymerization inhibitor exhibit low temperature flexibility and thermal shock resistance. These compositions can be made to have shadow curing ability by including in the composition an organic peroxide which has a 10 hour half life temperature of 85°C. to 105°C. The compositions are solventless and one package. These conformal coatings are useful to coat printed wire boards or printed circuit boards.