PRODUCTION OF FLAME-RETARDED POLYMETHACRYLIMIDE FOAM, POLYMETHACRYLIMIDE FOAM, AND FLAME-RETARDANT ADDITIVE

摘要

PROBLEM TO BE SOLVED: To provide a process for producing a flame-retarded polymethacrylimide foam capable of controlling the use of a flame-retardant and attaining as high an LOI value as possible by adding a specified component. ;SOLUTION: In the production of a flame-retarded polymethacrylimide foam, an ordinary flame-retardant and 0.1 to 4wt.% of an epoxy resin are added to a polymerization batch for polymethacrylimide foam. The flame-retardant is a halogen or phosphorus compd. It is advantageously an organophosphorus compd., particularly dimethyl methanephosphonate. The amt. of this compd. is usually about 5 to 15wt.% based on the monomer used. Examples of prefered epoxy resins include bisphenol A/epichlorohydrin oligomer, bisphenol F/ epichlorohydrin oligomer and a combination of them, which may contain a cross-linking agent (such as 1,6-hexane diglycidyl ether).;COPYRIGHT: (C)1997,JPO