| 摘要 |
PURPOSE:To obtain a modified phenolic resin excellent in flexibility and heat resistance and useful for paints, adhesives and molding materials, by reacting a reaction product between a specified compound and a phenol with an aldehyde. CONSTITUTION:1mol of a phenol of formula I (wherein R1 is H, a 1-8C alkyl or alkenyl, OH, a group of formula II or the like, and R2 is H, 1-8C alkyl or alkenyl) is reacted with 0.05-3mol of a compound of formula III (wherein R3-4 are each a group of formula IV or V) at 0-180 deg.C in the presence of an acidic catalyst such as sulfuric acid, and the product is neutralized and then dehydrated to obtain a compound (A). Compound A is reacted with an aldehyde in an amount to provide a ratio of the total number of moles of the OH groups in component A and OH groups in the phenol of formula I to the number of moles of the aldehyde groups of 1:0.1-2 at 80 deg.C-refluxing temperature for 30min-4hr in the presence (or absence) of a phenol of formula I in the presence of an acidic or alkaline catalyst to obtain the titled resin.
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