Process for producing modified phenolic resin

Details Process for producing modified phenolic resin Process for producing modified phenolic resin

C - Chemistry, Metallurgy

08

G

154/141, 402/47

C08G 8/32 (2006.01) B32B 27/42 (2006.01) C08G 8/24 (2006.01)

Patent

CA 1120187

Abstract of the Disclosure A drying oil such as isomerised linseed oil, dehydrated castor oil or the like oil which has an iodine value of more than 140 and a content of conjugated double bonds of less than 50% is reacted with isopropenylphenyl 1 and/or oligomers thereof, preferably in an amount, by weight of 0.1 - 2 times as great as that of the drying oil in the presence of a small amount Or an acid at a tmeperature of 65 - 150°C for 0.5 - 3 hours. By the reaction, isopropenylphenol and/or its oligomers are introduced to the drying oil while the double bonds of the oil are retained. The thus introduced oil is further reacted with a phenol or phenols under strongly acidic conditions to introduce the phenols thereto. The drying oil which has been introduced with the isopropenylphenol and/or its oligomers and also with the phenols is mixed with a phenol or phenols and then reacted with formaldehyde to give a modified phenolic rosin. This phenolic resin is useful for making a phenolic laminate with improved flexibility punching quality and water resistance.

308710

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