Patent ID: 8889762
Filing Date: 2014-11-18
Classification: C09D

Abstract:
1. An ink set for ink jet recording comprising a dye ink which contains a water-soluble dye and water and a pigment ink which contains a self-dispersible pigment and water; wherein the dye ink further contains a polymer having a lactam structure in an amount of 1% by weight to 3% by weight; and the pigment ink further contains a substance having a surface active ability and does not contain a polymer having a lactam structure; wherein the substance having the surface active ability includes (i) a penetrant which is a glycol ether compound having a number of carbon atoms of a main chain of 5 to 10, and (ii) a surfactant which includes an acetylene diol compound; and wherein the following Condition (I) or Condition (II) is fulfilled: Condition (I): the penetrant is contained in an amount of 5% by weight to 15% by weight and the surfactant is contained in an amount of 0.1% by weight to 1% by weight in the pigment ink; Condition (II): the penetrant is contained in an amount of 1% by weight to 5% by weight and the surfactant is contained in an amount of 0.4% by weight to 2% by weight in the pigment ink.