Process for the production of resins for printing ink

Claim 1

A process for the production of resins for offset printing ink comprising reacting an intermediary resin obtained by heat polymerizing, in the absence of a catalyst, at least one of cyclopentadiene, dicyclopentadiene and C 1 to C 3 alkyl substituted derivatives thereof and an unsaturated alcohol or unsaturated alcohol ester of organic acid wherein said unsaturated alcohol is a monoethylenically unsaturated monohydric alcohol of 3 to 22 carbon atoms and said unsaturated alcohol ester of organic acid is an ester of monoethylenically unsaturated monohydric alcohol of 2 to 22 carbon atoms with aliphatic or aromatic organic acid of 2 to 22 carbon atoms, at a temperature of 150° to 350° C. in the presence or in the absence of an inert hydrocarbon solvent, wherein the hydroxyl value of said intermediary resin is 30-300, with a higher monohydric saturated fatty acid or higher monohydric unsaturated fatty acid or their mixtures at a temperature ranging from 180° -280° C. to form the corresponding ester by esterification or ester-exchange to produce a resin having a softening point of 100° C or more wherein the amount of said higher monohydric saturated fatty acid or higher monohydric unsaturated fatty acid or their mixtures used is 0.2-1.1 moles for every mole of the hydroxyl amount determined from the hydroxyl value of said intermediary resin.