Abstract: A process for producing a novel modified resin, which comprises reacting (I) the reaction product of 98 to 35% by weight of a cyclopentadiene resin, 2 to 65% by weight of a higher fatty acid ester having a conjugated double bond and 0 to 30% by weight of an .alpha.,.beta.-unsaturated dicarboxylic acid anhydride, with (II) at least one vinyl monomer selected from the group consisting of vinyl aromatic compounds and unsaturated monocarboxylic acid esters; and a vehicle component composition for printing inks comprising the aforesaid modified resin.

Abstract: A process for producing a novel modified resin, which comprises reacting (I) the reaction product of (a) an adduct of a cyclopentadiene resin with an .alpha.,.beta.-unsaturated dicarboxylic acid anhydride, with (b) an adduct of a higher fatty acid ester having a conjugated double bond with an .alpha.,.beta.-unsaturated dicarboxylic acid anhydride, with (II) a polyamine having at least two primary or secondary amino groups; and a vehicle component composition for printing inks comprising the aforesaid modified resin.

Abstract: A process for preparing novel modified resins comprising heating and reacting an addition product (A) of a cyclopentadiene resin and an .alpha.,.beta.-unsaturated dicarboxylic acid anhydride with an addition product (B) of a higher aliphatic ester having a conjugated double bond and an .alpha.,.beta.-unsaturated dicarboxylic acid anhydride, in an inert gas atmosphere in the presence or absence of a metal compound; andA novel composition for printing inks comprising, as a vehicle component, a modified resin obtained by the reaction of 95 to 40% by weight of an addition product (A) of a cyclopentadiene resin and an .alpha.,.beta.-unsaturated dicarboxylic acid anhydride with 5 to 60% by weight of an addition product (B) of a higher aliphatic ester having a conjugated double bond and an .alpha.,.beta.-unsaturated dicarboxylic acid, in an inert gas atmosphere.