METHOD OF PREPARING EPOXIDE MOLDING MATERIALS Russian patent published in 2004 - IPC

FIELD: polymer materials. SUBSTANCE: epoxide molding materials are prepared by rolling epoxide resin blend, hardener (aromatic amine), filler, dye, and release agent, said epoxide resin blend containing solid 4,4'-isopropylidenediphenol epoxide resin with molecular weight 900 to 1600 and with corresponding prepolymer with molecular weight 340 to 600 (component A), 4,4- diaminodiphenylsulfone (component B), and 4,4-dihydroxydiphenylsulfone (component C) and being prepared by interaction of indicated components for 20 to 140 min at A/B/C component ratio from 88:11:1 to 65:25:10. According to invention, aromatic hydroxyl-containing compound is additionally introduced and rolling of total composition is effected for 4 to 16 min at 50 to 80 C followed by cooling of rolled material to temperature no higher than 25 C and crushing. Composition generally contains, wt parts: epoxide resin blend 100, hardener 10-35, accelerator 0.5-5, dye 0.5-9, release agent 1-5, and filler 100-600. EFFECT: enabled preparation of material ensuring resistance to temperature fluctuation effect at simultaneously achieved elevated heat resistance and high dielectric characteristics. 2 tbl