Ink composition, recording method and recording images using the same, as well as ink set and ink head
First Claim
Patent Images
1. An ink composition comprising:
- water;
a colorant containing a pigment;
a nonionic surfactant, the content of the nonionic surfactant being at a critical micelle concentration or more; and
a polyester resin containing a polybasic carboxylic acid ingredient and a polyhydric alcohol ingredient,the polybasic carboxylic acid ingredient containing three or more dicarboxylic acids which include at least sodium 5-sulfoisophthalate and aromatic dicarboxylic acid not having a metal sulfonate group, wherein a ratio of the aromatic dicarboxylic acid having a metal sulfonate group contained in the polybasic carboxylic acid ingredient is 0.5 mol % or more and 3.5 mol % or less, andwherein the polyester resin has a number average molecular weight within a range of from 5,000 to 50,000, and the polyester resin has a glass transition point Tg within a range of from −
20°
C. to 70°
C.
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Abstract
An ink composition is prepared by incorporating water, a colorant and a polyester resin in which a polybasic carboxylic acid ingredient contains an aromatic dicarboxylic acid having a metal sulfonate group. The ink composition is stored in an ink tank of an ink head, the ink composition is supplied from the ink tank into an ink chamber having a discharge port, a voltage is applied to partition wall portions formed of a piezoelectric material, a pressure is applied to the ink composition contained in the ink chamber by the partition wall portions and liquid droplets of the ink composition are discharged from the discharge port and deposited on a recording material thereby recording images.
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Citations
27 Claims
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1. An ink composition comprising:
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water; a colorant containing a pigment; a nonionic surfactant, the content of the nonionic surfactant being at a critical micelle concentration or more; and a polyester resin containing a polybasic carboxylic acid ingredient and a polyhydric alcohol ingredient, the polybasic carboxylic acid ingredient containing three or more dicarboxylic acids which include at least sodium 5-sulfoisophthalate and aromatic dicarboxylic acid not having a metal sulfonate group, wherein a ratio of the aromatic dicarboxylic acid having a metal sulfonate group contained in the polybasic carboxylic acid ingredient is 0.5 mol % or more and 3.5 mol % or less, and wherein the polyester resin has a number average molecular weight within a range of from 5,000 to 50,000, and the polyester resin has a glass transition point Tg within a range of from −
20°
C. to 70°
C. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27)
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Specification