PURPOSE: An offset ink composition with excellent luster, emulsification characteristics, misting, setting and drying properties, prepd. by the incorporation of a thermal reaction product between a specified acid-modified hydrocarbon resin and an alkyl- substd. phenol resin as a vehicle.
CONSTITUTION: 100pts.wt. hydrocarbon resin obtd. of the copolymn. by 100pts.wt. five-membered cyclic compd. of the formula (wherein R is 1W3C alkyl; m and n are 0 or at least 1 where m+n=6) and/or Diels-Alder adduct thereof, such as (di) cyclopentadiene, with 5W50pts.wt. drying oil or fatty acid such as linseed oil or myristic acid, is reacted with 1W15pts.wt. unsaturated carboxylic acid or anhydride thereof, to obtain acid-modified hydrocarbon resin (A). Then 100pts.wt. resin A is thermally reacted with 5W100pts.wt. 4W9C alkyl-substd. phenol-formaldehyde resin to obtain resin (B). 100pts.wt. resin B is dissolved in a mixt. consisting of 50W200pts.wt. specified high-boiling hydrocarbon solvent and 10W100pts.wt. drying oil, and the resulting soln. is compounded with a pigment to form the titled ink composition.
SASAKI MAKOTO
HAYASHI HIDEO
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