VARNISHES FOR GLASSCLOTH LAMINATES, METHOD OF THEIR PRODUCTION AND LAMINATES MADE THEREFROM

摘要

The present invention relates to varnishes for use in the preparation of glasscloth laminates, methods of their production and laminates made therefrom. The varnish is made by dissolving 100 parts of a TFP resin having a number average molecular weight of about 1000 and an oxygen content of about 8% in 60 to 65 parts of butan-2-one or isopropanol. 8 to 12 parts of hexamine are dissolved in a minimum quantity of a solvent comprising water and IMS in a ratio of about 3:5. The two solutions are thoroughly mixed and filtered to produce the varnish. The varnish is used to prepare glasscloth laminates for use as printed circuit boards.