Self-curing solid resol resin composition and its preparation

Abstract

Abstract PURPOSE: To obtain a self-curing solid resol resin of constant quality readily, by incorporating a novolak resin into a dehydrated and concentrated revol resin, which is the reaction product of a phesol with formaldehyde. CONSTITUTION: A phenol (p) is condensed with formaldehyde (F) in the presence of an alkali catalyst or a neutral salt at a molar ratio of (F) to (P) of 1.5W2.5:1 to give a resol resin having a suitable molecular weight, which is dehydrated and concentrated in vacuo. At the resol resin temperature of 90W110°C, a novolak resin having a softening point ≥110°C is incorporated into the resin, and the mixture is cooled to form a self-curing solid resol resin composition. If the resin temperature is below 90°C, the dehydration is insufficient. If the temperature exceeds 110°C, the curing tends to proceed. COPYRIGHT: (C)1980,JPO&Japio

Inventors

• 👤 Takaaki Sakamoto
• 👤 Naokatsu Fujita
• 👤 Taro Fukui

Bibliographic Details