Flame-retardant resin composition

TLDR: In this article, the subject composition of a paper-phenol resin copper-clad laminate was obtained using a specified ratio of a melamine-modified phenol formaldehyde, a phosphate and an ammonium phosphate.

Abstract: PURPOSE:To obtain the subject composition containing a specified ratio of a melamine-modified phenol formaldehyde, a phosphate and an ammonium phosphate, excellent in environmental safety and useful for a paper-phenol resin copper-clad laminate. CONSTITUTION:This resin composition contains (A) 30 to 80wt.% the nitrogen content is preferably 2 to 30wt.%) melamine-modified phenol formaldehyde [e.g. (i) a cocondensed material among a phenol such as xylenol, a melamine such as benzoguanamine and formaldehyde, (ii) a mixture of the cocondensed material of (i) with a general phenol resin and (iii) a mixture of a phenol- formaldehyde condensed material with a melainne-formaldehyde condensed material, a material modified with, e.g. tung oil, etc.], (B) 10 to 50wt.% phosphate (e.g. triphenyl phosphate) and (C) 2 to 30wt.% ammonium phosphate (e.g. phosphoric acid-ammonium).