COCONDENSED UREA RESIN

摘要

¢ ! It is the object of the present invention to improve the resistances to water, weather and boiling water and the workability of cocondensed resins. According to the present invention, the foregoing object is attained by providing a cocondensation resin which entails cocondensing urea with a polyvalent phenol. It is generally difficult to cocondense urea with a polyvalent phenol. According to the present invention, nevertheless, a cocondensed resin is easily able to be produced by reacting 1 mol of urea with 0.2 to 2.0 mol of a polyvalent phenol and 0.1 to 2.0 mol of an aldehyde donor by heating in a pH range from 4 to 9. - 1 4