Abstract: Printing ink attached to non-printing parts on a waterless planographic printing plate can be removed by bringing a rotary roller having a circumferential adhesive surface coated with viscous ink having higher viscosity than that of the printing ink applied to the printing plate into contact with the printing plate in rotation. The viscous ink applied to the rotary roller is higher in viscosity than the printing ink applied to the printing plate for printing, so that the ink transferred from the printing plate to the rotary roller can be steadily captured thus the unnecessary printing ink attached to the non-printing parts on the printing plate is completely removed. Consequently, clear and sharp printed matter with print images excellently reproduced can be obtained at a low cost.

Abstract: Ink-receptive printing parts formed on a waterless planographic printing plate are formed with toner, and ink-repellent non-printing parts of the same are formed of silicone rubber, so that the printing plate can be produced without using a light exposing device and a developing device. The printing plate using paper as a substrate can be produced at a low cost compared with that using an aluminum printing substrate. The production of the waterless planographic printing plate without use of organic solvent prevents working effectiveness in printing from being deteriorated.

Abstract: A process for producing a novel modified resin, which comprises reacting (I) a hydroxyl-containing resin with (II) a polyisocyanate compound, said resin (I) being prepared by reacting (a) the reaction product of a cyclopentadiene resin, a higher fatty acid ester having a conjugated double bond and an .alpha.,.beta.-unsaturated dicarboxylic acid anhydride with (b) a hydroxyl group-imparting agent; a modified resin obtained by the aforesaid process; and a printing ink comprising the modified resin as a vehicle component.

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 an oil-modified resin having a softening point of 40.degree. to 200.degree. C., which comprises reacting [A] an acid-modified cyclopentadiene resin having an acid value of 0.1 to 100 in the presence of [C] at least one metal compound selected from the group consisting of polyvalent metal alcoholates and chelate compounds thereof with [B] an oily modifier containing at least 4 carbon atoms and having a functional group capable of reacting with the metal compound [C], said acid-modified cyclopentadiene resin being selected from the group consisting of (i) the reaction product of 100 parts by weight of a cyclopentadiene resin free from a carboxyl or acid anhydride group, 0 to 200 parts by weight of a higher fatty acid ester containing a conjugated double bond and 0.2 to 50 parts by weight of an .alpha.,.beta.

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.