Electrical insulating composition comprising an epoxy resin, a phenolic resin and a polyvinyl acetal resin in combination

摘要

An electrically insulating wire coating material comprises the reaction product of a mixture of polyvinyl acetal, phenol aldehyde resin and epoxy resin in a particular range of proportions. The mixture is formed into a powder for applying to a wire without the use of solvents, the coated wire being heated to harden the applied coating. The mixture can also be applied as a high solid enamel by the use of a small amount of solvent.