Patent ID: 7772298
Filing Date: 2010-08-10
Classification: C09D

Abstract:
1. A clear ink composition, which contains polymer fine particles, and does not contain a colorant or contains a colorant in an amount of not more than 0.4 wt % such that the ink composition is clear, wherein said polymer fine particles are polymer fine particles of at least one type selected from the group consisting of (i) sulfonic acid group-containing polymers, (ii) modified polyolefin emulsions, (iii) copolymers obtained by polymerizing, in the presence of an alcoholic hydroxyl group-containing water-soluble macromolecular compound or a copolymerizable surfactant, an ethylenic unsaturated carboxylic acid monomer and another monomer copolymerizable therewith, and (iv) emulsified resins having a particle diameter of at least 70 nm, wherein said sulfonic acid group-containing polymers are dienic sulfonic acid group-containing polymers and/or non-dienic sulfonic acid group-containing polymers, wherein said sulfonic acid group-containing polymers have an acid value of at least 100, and wherein said polymer fine particles have a weight average molecular weight Mw in a range of 8.000 to 20,000 inclusive, and a glass transition temperature Tg as measured in accordance with JIS K6900 in a range of 5° C. to 50° C. inclusive.