Abstract: Synthetic resins suitable for use in printing ink compositions are produced by reacting a mixture consisting essentially of (a) a predominant amount of dicyclopentadiene and lesser amounts of (b) at least one hydrocarbon selected from the group consisting of monoolefins, diolefins, and polyenes each having more than five carbon atoms, and having no aromatic rings, and (c) at least one member selected from the group consisting of fatty acid-containing materials and rosin acid-containing materials. Additional synthetic resins suitable for use in printing ink compositions are produced by reacting components (a) to (c) above with an ethylenically unsaturated lower aliphatic dicarboxylic acid or anhydride, such as maleic anhydride.

Abstract: Synthetic resins suitable for use in printing ink compositions are produced by typically forming a base resin by polymerizing a reaction mixture consisting essentially of (a) a predominant amount of dicyclopentadiene and lesser amounts of (b) at least one hydrocarbon-containing material selected from the group consisting of debutanized aromatic concentrates, C.sub.5 olefins and acyclic, conjugated C.sub.5 dienes, and (c) at least one member selected from the group consisting of fatty acid-containing materials and rosin acid-containing materials. The base resin may be modified through a reaction with an ethylenically unsaturated lower aliphatic dicarboxylic acid or anhydride, such as maleic anhydride.

Abstract: Synthetic resins suitable for use in printing ink compositions are produced by forming a base resin by polymerizing a reaction mixture consisting essentially of (a) a predominate amount of dicyclopentadiene and lesser amounts of (b) a mixture of dimerized conjugated aliphatic cyclic and non-cyclic dienes of five carbon atoms, and (c) tall oil. In a separate reaction the base resin is modified through a reaction with an ethylenically unsaturated lower aliphatic dicarboxylic acid or anhydride, such an maleic anhydride.

Abstract: Ethyl cellulose-compatible phenol-modified hydrocarbon resins are produced by polymerizing a reaction mixture containing indene, vinyl toluene, and dicyclopentadiene as the essential polymerizable constituents in the presence of a phenol compound and a Friedel-Crafts type catalyst such as boron trifluoride phenol complex. The phenol-modified hydrocarbon resin has a ring and ball softening point of above about 120.degree. C, a solution viscosity (Gardner-Holdt, sec.) of between about 0.7 and about 15, a hydroxyl number of above about 10, and is ethyl hydroxyethyl cellulose compatible as well as ethyl cellulose compatible. Thus, these resins are particularly useful as replacements for rosin and rosin derivatives in rotogravure printing ink.