Patent ID: 6093762
Filing Date: 2000-07-25
Classification: C08G,C08L,C09D

Abstract:
A binder resin of petroleum resin-modified phenol resin (I) for a lithographic printing ink vehicle, said binder resin comprising a component material prepared by reacting:100 parts by weight of an acid modified hydrocarbon resin (A) with 30 to 150 parts by weight of a phenol resin (B) having alkyl substituent groups, each group having 4 to 25 carbon atoms, wherein portions of said phenol resin (B) are fed one after another for reaction with said acid modified hydrocarbon resin (A), said acid modified hydrocarbon resin (A) being prepared by reacting:(a) 100 parts by weight of compounds comprising five-membered cyclic compounds represented by the formula [1] or their Diels-Alder reaction products: ##STR7## wherein R denotes a hydrogen atom or an alkyl group having 1 to 3 carbon atoms, n is an integer from 1 to 6, and each R may be the same or different, and (b) 1 to 20 parts by weight of unsaturated carboxylic acids or their anhydrides,said petroleum resin-modified phenol resin (I) having the properties of:(i) a weight average molecular weight of not less than 200,000,(ii) a melt viscosity (V.sub.m) of not higher than 100 Pa.multidot.s, and(iii) a K value (V.sub.m /V.sub.s) as a ratio of melt viscosity to solution viscosity (V.sub.s) of not higher than 0.2.