AMINOPLAST RESIN MOULDING COMPOSITION

摘要

A thermosetting moulding composition comprising an aminoplastic resin, and a filler which is constituted at least in part by a cured aminoplast material produced by a process comprising mixing a urea- or melamine, formaldehyde resin or precursors for producing same with an acid catalyst at a pH of less than 4 and agitating the system to produce a slurry containing cured aminoplast material in precipitated particulate form, the constant of the precipitated aminoplast in the slurry being controlled at less than 20% by weight; fillers produced in this fashion have -NH- groups capable of reacting with the resin during curing of the latter.