SOLID EPOXY RESIN COMPOSITION FOR RAPIDLY CURABLE POWDER COATING

• Main Authors: HARADA TAIRA, URAKAWA TOSHIYA
• Format: Patent
• Language: English
• Published: 29.10.1996
• Edition: 6
• Subjects: ADHESIVES; CHEMICAL PAINT OR INK REMOVERS; CHEMISTRY; COATING COMPOSITIONS, e.g. PAINTS, VARNISHES ORLACQUERS; COMPOSITIONS BASED THEREON; COMPOSITIONS OF MACROMOLECULAR COMPOUNDS; CORRECTING FLUIDS; DYES; FILLING PASTES; INKS; MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONSONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS; METALLURGY; MISCELLANEOUS APPLICATIONS OF MATERIALS; MISCELLANEOUS COMPOSITIONS; NATURAL RESINS; ORGANIC MACROMOLECULAR COMPOUNDS; PAINTS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; POLISHES; THEIR PREPARATION OR CHEMICAL WORKING-UP; USE OF MATERIALS THEREFOR; WOODSTAINS

PURPOSE: To obtain an solid epoxy resin composition for rapidly curable powder coating giving excellent coated membrane performance, even when the backing time is short, and also superior in shock resistance by allowing a specific bisphenolic epoxy resin to react with bisphenolic compounds and a bisphenol A novolak epoxy resin. CONSTITUTION: (A) A bisphenol-A epoxy resin of formula I (R and R are each H, methyl; n is an integer of 0-6), (B) bisphenol compounds of formula II (R and R are each H, methyl, ethyl, butyl) and (C) a bisphenol A novolak and epoxy resin obtained by reaction of (i) a bisphenol A novolak resin of 100-300g/eq prepared by reaction of bisphenol A and formaldehyde in the presence of an acid catalyst with (ii) an epihalohydrin are made to react. This reaction is preferably carried out at 100-180 deg.C for 2-12 hours in a weight proportion of A:B:C=(0-500):(100-500):(10-500).