Patent ID: 6929689

Claim:
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 μl 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=θ−θ o ) (θ is the 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=r t 2 /r o 2 (r t is a dot radius after t second) is in the range of 1.5 <Y.