W/o emulsion ink for inkjet
AssigneeRiso Kagaku Corporation
InventorsKazuyuki ANDO, Naofumi Ezaki, Shinichiro Shimura
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Abstract
A water-in-oil (W/O) emulsion ink having an ejection performance suitable for inkjet printing and superior storage stability at high temperature includes as emulsifiers, a polyglyceryl fatty acid ester (A) having a fatty acid moiety is isostearic acid or oleic acid with an HLB value of 7-14 and a glycerol polymerization degree of not less than 4, at least one nonionic surfactant (B) selected from (B-a) an esterification product of an organic compound with 3-5 hydroxyl groups and a fatty acid having 18 carbon atoms, (B-b) an alkyl glyceryl ether, (B-c) a diterpene alcohol and (B-d) a sucrose fatty acid ester having an HLB value of not more than 13.
Claims14
A water-in-oil (W/O) emulsion ink for inkjet, having a water phase dispersed in an oil phase by use of a polyglyceryl fatty acid ester (A) and a nonionic surfactant (B) as emulsifiers, in which the fatty acid moiety of the polyglyceryl fatty acid ester (A) is oleic acid or isostearic acid, and the polyglyceryl fatty acid ester (A) has an HLB value of 7-14 and a glycerol polymerization degree of not less than 4, and the nonionic surfactant (B) is at least one selected from the group consisting of:
- (B-a) an esterification product of an organic compound with 3-5 hydroxyl groups and a fatty acid with 18 carbon atoms;
- (B-b) an alkyl glyceryl ether;
- (B-c) a diterpene alcohol;
- and
- (B-d) a sucrose fatty acid ester having an HLB value of not more than 13.
A water-in-oil (W/O) emulsion ink for inkjet, having a water phase dispersed in an oil phase by use of a polyglyceryl fatty acid ester (A) as an emulsifier, in which the fatty acid moiety of the polyglyceryl fatty acid ester (A) is oleic acid or isostearic acid, and the polyglyceryl fatty acid ester (A) has an HLB value of 7-14, the ink further comprising a pigment in the oil phase and a water soluble dye in the water phase.
Dependencies are inferred from the claim text.