Ink for inkjet recording

摘要

The present invention provides ink for inkjet recording containing ethylene glycol base ether and/or monovalent alkyl alcohol, a surfactant and a coloring agent, the ink showing the following characteristics when 2 mul of the ink is dropped on a piece of ordinary paper having smoothness of 100 sec or lower: a) an initial contact angle is in the range of 30 to 80°; b) a dynamic contact angle after 1 second X=theta-theta0 (theta is a dynamic contact angle after 1 second) according to dynamic absorption measurement is in the range of -70<=X<=-20 (°/s); and c) the rate of change of a dot area after t second (0.1<t<5(s)) Y=rt<2>/r0<2 >(rt is a dot radius after t second) is in the range of 1.5<Y. With this ink, clear images which are less prone to smear are produced even by high speed recording on a piece of ordinary paper.