abstract |
PROBLEM TO BE SOLVED: To provide a branched polyurethane curable by radiation and a composition curable by radiation containing the same. The present invention relates to a branched polyurethane cured by radiation represented by the following general formula (I) and an ink composition cured by radiation containing the same. In the formula, R represents a divalent aromatic group or aliphatic group, R ′ represents a divalent aliphatic group, R ″ represents an aliphatic group, and R ′ ″ represents a hydrogen atom or an ethyl group. And n ≧ 3. [Selection figure] None |