| 摘要 |
<p>PURPOSE:To obtain the title resin suitable for use in substrate impregnation varnishes, having improved solubility in organic solvents, at a low cost, by reacting formaldehyde with the addition reaction product between phenol and a liquid polybutadiene. CONSTITUTION:(B) A phenol is subjected to addition reaction with (A) a liquid polybutadiene having an average molecular weight of 150-5,000 in the presence of an acid catalyst to give a ratio of the number of butadiene monomer units in (A) to that of molecules of (B) of 3-8:1. The reaction product is then reacted with (C) formaldehyde in the presence of a primary amino of the formula R-NH2 (R is 1-20C alkyl group) solely or in combination with a basic catalyst. EFFECT:Laminates prepared from the resin have improved mechanical workability, chemical resistance, and curability.</p> |
