Patent ID: 8795423

Claim:
An ink for inkjet recording apparatuses comprising at least water, a pigment dispersion, a high penetrating agent, a penetrating agent and a humectant, wherein the pigment dispersion contains a resin having a molecular weight in the range of 35,000 to 140,000 and a pigment, an adsorbed resin proportion, obtained using the following formula from the mass of a total amount of the resin in the ink and an amount of resin separated from pigment among the resin, is at least 0.95 and less than 1.00: adsorbed resin proportion=1−(free resin mass/total resin mass), the content of the pigment in the ink is in the range of 4% by mass to 9.5% by mass, the humectant is glycerin and 1,3-propanediol, the content of glycerin in the ink is at least 5% by mass, and the content of 1,3-propanediol is in the range of 10% by mass to 30% by mass, the high penetrating agent is 1,2-octanediol, the content of the high penetrating agent in the ink is in the range of 0.2% by mass to 0.8% by mass, and the penetrating agent is a C2-C4 monoalkyl ether of a polyhydric alcohol.