Hayakawa Rubber Company Limited

Masao Etori

Toshihiro Fujii

Hiroki Nii

Ban Tanaka

Makoto Ikeda

An excellent ultraviolet ray-curable ink for printing which shrinks little at the time of curing, and exhibits high adhesion, followability, aging-crack resistance, elasticity, elongation, tenacity, chemical resistance, and a scratch resistant property, by a novel ultraviolet ray-curable ink comprising by weight; 100 parts of an ultraviolet ray-curable rubbery copolymer having the general formula ##STR1## wherein R represents an alkylene group having 2-8 carbon atoms, R.sub.1 is H or CH.sub.3, R.sub.2 is a residue of diisocyanate, R.sub.3 is a residue of dihydric alcohol from which at least one or more hydroxyl group is removed, X is a moiety of dienic liquidus rubber having at least one or more hydroxyl groups from which at least one or more hydroxyl groups is removed, l is a number of 1-4, m is a number of 1.0&lt;m&lt;3.0, n is a number of 1-12; 50-500 parts of at least one kind of mono or polyfunctional monomer; 0-300 parts of at least one kind of mono or polyfunctional photopolymerizable oligomer; and 1-30 parts of a photopolymerization initiator.

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Nishikasugai, Japan

Masao Etori