Ink for ink jet recording and ink jet recording method

Abstract

The present invention provides an ink which provides an image with a sufficient image density free from bleeding and unevenness, dries rapidly on paper and can be jetted at a high reliability and a recording method using said ink. A novel ink for ink jet recording comprising water, a coloring material and a water-soluble organic solvent is provided, characterized in that said ink comprises a polymer containing a carboxyl group having an average molecular weight of from 1,000 to 20,000 in the free or salt state in an amount of from 0.1 to 3% by weight, a water-soluble organic compound which normally stays solid and vaporizes in a proportion of not less than 50% by weight at a temperature of from 100.degree. C. to 350.degree. C. in an amount of from 1 to 20% by weight, and a compound represented by the following formula (A): R--O--X.sub.n H (A) wherein R represents a functional group selected from the group consisting of C.sub.4-8 alkyl, alkenyl, alkinyl, phenyl, alkylphenyl, alkenylphenyl and cycloalkyl groups; X represents an oxyethylene or oxypropylene group; and n represents an integer of from 1 to 4 in an amount of from 1 to 20% by weight, and said ink exhibits a surface tension of from 20 to 40 mN/m and a pH value of not less than 7.5. The ink is jetted at an output of from 1 to 70 ng per droplet to effect recording.

Dependencies are inferred from the claim text.