| 摘要 |
PURPOSE:To manufacture a thermosetting resin laminated board having excellent flame-retardance and moisture resistance, by preparing a cocondensation resin from formaldehyde and an ester exchange reaction product of a phosphate or phosphite and a polyhydric phenol, and using the resin as a varnish for pretreatment. CONSTITUTION:The objective laminated board can be manufactured by (1) carrying out the cocondensation of (A) a reaction product obtained by the ester-exchange reaction of (i) 1-4mol of a phosphoric acid ester of formula I and/or a phosphorous acid ester of formula II (R1-6 are alkyl, aryl, preferably aryl) with (ii) preferably 1-3mol of a polyhydric phenol in the presence of anhydrous K2CO3, etc. as a catalyst, at >=100 deg.C with (B) 1-3mol of formaldehyde, based on 1mol of the compound having phenolic hydroxyl group, using trimethylamine, etc. as a catalyst, (2) using the obtained resin as the varnish for the pretreatment, and a thermosetting resin as the varnish for the post-treatment, and (3) laminating the substrates impregnated or coated with said varnishes. |
