| abstract |
PURPOSE: To prepare a phenolic resin improved in processability and heat resistance, and giving a cured article improved in strengths so as to be suitable for the use as a compounding ingredient for various resin compsn., curing agent and modifier for various resins, etc., by giving a specific structure to the phenolic resin. n CONSTITUTION: One mol of a phenolic compd. (e.g. 2-allylphenol) is reacted with 0.05-1mol of an aldehyde compd. in the presence of an alkali or acid catalyst in an org. solvent at 100-150°C for 4-8hr to give a polymer, which is isomerized with an alkali to give a propenyl phenol resin of the formula [wherein R 1 is H or a 1-11C (substd.) monovalent hydrocarbon group; X is H or halogen; l is 0 or higher; m is 1 or higher; and l+m is 1-50]. n COPYRIGHT: (C)1991,JPO&Japio |