Recording ink containing pigment particles and polyvinyl pyrrolidone
AssigneeBrother Kogyo Kabushiki Kaisha
InventorsTakeo Kitahara, Shunichi Higashiyama
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Abstract
A recording ink which includes at least water, a pigment as a colorant, polyvinyl pyrrolidone as a water-soluble polymer, and a compound having a polyoxyethylene chain. The compound having a polyoxyethylene chain may be replaced by a compound having a fluorinated hydrocarbon group.
Claims47
A recording ink comprising at least water, a pigment as a colorant, 2-5% by weight of polyvinyl pyrrolidone as a water-soluble polymer, and a surface active agent having a polyoxyethylene chain.
A recording ink comprising at least water, a pigment as a colorant, polyvinyl pyrrolidone as a water-soluble polymer, and a fluorine-containing nonionic or anionic surface active agent having a fluorinated hydrocarbon group.
A recording ink comprising at least water, a pigment as a colorant, polyvinyl pyrrolidone as a water-soluble polymer, and a surface active agent having a polyoxyethylene chain, said surface active agent having a polyoxyethylene chain being a surface active agent containing a polyoxyethylene group, which is selected from the group consisting of polyoxyethylene alkyl aryl ethers, polyoxyethylene polyoxypropylene alkyl ethers, polyoxyethylene alkyl amines, polyoxyethylene fatty acid alkanol amides, polyoxyethylene sorbitol fatty acid esters, polyoxyethylene alkyl ether sulfates, and polyoxyethylene alkyl aryl ether sulfates.
A recording ink comprising at least water, a pigment as a colorant, polyvinyl pyrrolidone as a water-soluble polymer, and a surface active agent having a polyoxyethylene chain, said surface active agent having a polyoxyethylene chain being a surface active agent containing a polyethylene glycol group.
A method of producing a recording ink comprising the steps of:
- preparing an aqueous solution containing a surface active agent having a polyoxyethylene chain;
- adding polyvinyl pyrrolidone as a water-soluble polymer to said aqueous solution;
- and
- dispersing a pigment as a colorant in said aqueous solution.
A method of producing a recording ink comprising the steps of:
- preparing an aqueous solution containing a fluorine-containing nonionic or anionic surface active agent having a fluorinated hydrocarbon group;
- adding polyvinyl pyrrolidone as a water-soluble polymer to said aqueous solution;
- and then
- dispersing a pigment as a colorant in said aqueous solution.
Dependencies are inferred from the claim text.