Patent ID: 7981209
Filing Date: 2011-07-19
Classification: B41M,C09D,Y10T

Abstract:
1. An ink composition for ink jet recording, comprising at least a colorant, water, a surfactant and 1,2-hexanediol, wherein the surfactant satisfies a requirement represented by formula ( wherein (i) α represents contact angle of a recording medium with an aqueous solution containing 0.1% by weight of the surfactant 0.3 sec after the contact of the aqueous solution with the recording medium, degree; and (ii) β represents contact angle of a recording medium with an aqueous solution containing 0.1% by weight of the surfactant, 20% by weight of glycerin, 10% by weight of 1,2-hexanediol and 0.9% by weight of triethanolamine 0.3 sec after the contact of the aqueous solution with the recording medium degree, the α value is not more than 20 degrees, and the β value is not less than 20degrees, the surfactant is polyorganosiloxane and is present in the ink composition in an amount of 0.01 to 2 percent by weight, the 1,2-hexanediol being present in the ink composition in an amount effective to improve solubility of the surfactant in the ink composition, said amount of 1,2-hexanediol being in a range of 8 to 18% by weight, wherein the polyorganosiloxane comprises one or at least two compounds represented by the following formula: wherein R represents a hydrogen atom or a methyl group; a is an integer of 7to 13; m is an integer of 2 to 70; and n is an integer of 1 to 5.