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US 8,784,550 B2Granted
Oxide pigment dispersion for inkjet ink
AssigneeHewlett-Packard Development Company, L.P.
InventorVladek Kasperchik
Life of this patent
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Abstract
An oxide pigment dispersion comprised of nano-sized particles of inorganic oxide and a reactive dispersant, and an inkjet ink based on this dispersion.
Claims22
An oxide pigment dispersion, consisting of:
- a. inorganic oxide particles having a particle size of less than about 150 nm;
- b. a polyether alkoxysilane reactive dispersant represented by the following general Formula (I):
- wherein R1, R2 and R3 are hydroxyl, linear or branched alkoxy groups that undergo hydrolysis in water to form a reactive silanol group that attaches to a hydroxyl group on a surface of the inorganic oxide particles;
- PE is a polyether oligomer chain segment of the structural formula:
- [(CH2)n—CHR—O—]m, wherein n is an integer ranging from 0 to 3, wherein m is an integer superior or equal to 2, and wherein R is H or a chain alkyl group;
- and wherein R4 is hydrogen, or a linear or branched alkyl group;
- and
- c. the water.
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An oxide pigment dispersion, consisting of:
- a. inorganic oxide particles having a particle size less than about 150 nm and
- b. a polyether alkoxysilane reactive dispersant represented by the following general Formula (II):
- wherein R′, R″ and R′″ are linear or branched alkyl groups that undergo hydrolysis in water to form a reactive silanol group that attaches to a hydroxyl group on a surface of the inorganic oxide particles;
- PE is a polyether oligomer chain segment of the structural formula:
- [(CH2)n—CHR—O—]m, wherein n is an integer ranging from 0 to 3, wherein m is an integer superior or equal to 2, and wherein R is H or a chain alkyl group having from 1 to 3 carbon atoms;
- and R4 is H or a linear or branched alkyl group having from 1 to 5 carbon atoms;
- and
- c. the water.
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A method for making an oxide pigment dispersion, said method comprising:
- forming a mixture consisting of an inorganic oxide pigment, water, and a polyether alkoxysilane reactive dispersant to form a starting aqueous dispersion, said polyether alkoxysilane reactive dispersant having the following general Formula II:
- wherein
- a) R′, R″ and R′″ are linear or branched alkyl groups;
- b) PE is a polyether oligomer chain segment of the structural formula:
- [(CH2)n—CHR—O—]m, wherein n is an integer ranging from 0 to 3, wherein m is an integer superior or equal to 2, and wherein R is H or a chain alkyl group having from 1 to 3 carbon atoms;
- c) R4 is H or a linear or branched alkyl group having from 1-5 carbon atoms;
- and
- milling the aqueous starting dispersion to reduce the particle size of the inorganic oxide pigment;
- whereby the polyether alkoxysilane reactive dispersant dissolve in the water and undergo hydrolysis to form a hydrolyzed polyether alkoxysilane reactive dispersant having a silanol group that reacts with a hydroxyl group on the inorganic oxide pigment to attach the hydrolyzed polyether alkoxysilane reactive dispersant to the inorganic oxide pigment.
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Dependencies are inferred from the claim text.