High molecular weight ortho cresol-novolak resins and process for the preparation thereof using alcoholic or acidic organic solvents
First Claim
1. A process for preparing a high molecular weight cresol-novolak resin having a softening point of 30°
- C. or higher, consisting essentially of polycondensing orthocresol or a mixture of orthocresol and paracresol with an aldehyde compound or a derivative thereof in a solvent selected from the group consisting of C3-12 aliphatic monoalcohols, C3-6 monohydric glycol ethers and benzyl alcohol, in the presence of a protonic acid catalyst.
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Accused Products
Abstract
Orthocresol or a mixture of orthocresol and paracresol and an aldehyde compound or a derivative thereof are subjected to polycondensation in a solvent selected from an aliphatic alcohol having 3 to 12 carbon atoms, a glycol ether having 3 to 6 carbon atoms, benzyl alcohol and an aliphatic carboxylic acid having 2 to 6 carbon atoms, in the presence of an acid catalyst, to obtain linear and high molecular weight orthocresol-novolak resins or orthocresol/paracresol random copolymerized novolak resins which have a high softening point of 145° C. or higher and a high number average molecular weight of 1500 or more and which are highly soluble in alcohols and ketones and are highly compatible with resins.
48 Citations
11 Claims
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1. A process for preparing a high molecular weight cresol-novolak resin having a softening point of 30°
- C. or higher, consisting essentially of polycondensing orthocresol or a mixture of orthocresol and paracresol with an aldehyde compound or a derivative thereof in a solvent selected from the group consisting of C3-12 aliphatic monoalcohols, C3-6 monohydric glycol ethers and benzyl alcohol, in the presence of a protonic acid catalyst.
- View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
Specification