New Solvent for Epoxy Novolac Protective Coat
Original Publication Date: 1985-Jan-01
Included in the Prior Art Database: 2005-Feb-18
The chemistry of the epoxy protective coating [*] (epoxy novolac), used as an insulation coating on board and panel products, contains approximately 20% CELLOSOLVE* acetate (CA). This solvent has recently been identified as a potential reproductive hazard. A propylene glycol monomethyl ether acetate (PGMEA) solvent is described as a substitute for the CELLOSOLVE acetate. Viscosity characteristics of the resultant system are slightly different, yet continued reformulations are planned to allow for a closer match-up of final viscosities, if necessary. The PGMEA has an excellent match-up of solubility parameters with the CELLOSOLVE acetate, where PGMEA = 8.455 and CA = 8.352, respectively.