Inkjet printing medium comprising multiple coatings
AssigneeHewlett-Packard Company
InventorHuawen Li
Life of this patent
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Abstract
A printing medium suitable for inkjet printing comprises a substrate having at least two water-absorptive coatings applied sequentially. Each of the two water-absorptive coatings comprises hydrophilic organic polymer and small discrete nonfilm-forming particles. The hydrophilic organic polymer of the interior water-absorptive coating adjacent the exterior water-absorptive coating contains a greater quantity of nitrogen-containing substance than the hydrophilic organic polymer of the exterior water-absorptive coating. “Nitrogen-containing substance” is defined as being independently selected from the group consisting of quaternary ammonium mer units, poly(N-vinylpyrrolidinone), copolymer of N-vinylpyrrolidinone and α-(meth)acrylyloxy-ω-(hydroxy, methoxy, or ethoxy)-poly(ethylene oxide), and two or more thereof.
Claims18
A printing medium comprising:
- (a) a substrate having at least one surface;
- (b) a first interior water-absorptive coating on a surface of the substrate wherein the interior water-absorptive coating comprises:
- (1) a matrix of hydrophilic organic polymer which contains from 0 to 30 percent by weight nitrogen-containing substance, and
- (2) discrete nonfilm-forming particles which have a number average particle size in the range of from 1 to 500 nanometers and which are distributed throughout the matrix of the interior water-absorptive coating;
- (c) a second interior water-absorptive coating on the first interior water-absorptive coating wherein the second interior water-absorptive coating comprises:
- (1) a matrix of hydrophilic organic polymer which contains from 10 to 50 percent by weight nitrogen-containing substance, and
- (2) discrete nonfilm-forming particles which have a number average particle size in the range of from 1 to 500 nanometers and which are distributed throughout the matrix of the interior water-absorptive coating;
- and
- (d) an exterior water-absorptive coating on the second interior water-absorptive coating wherein the exterior water-absorptive coating comprises:
- (1) a matrix of hydrophilic organic polymer which contains from 0 to 30 percent by weight nitrogen-containing substance, and
- (2) discrete nonfilm-forming particles which have a number average particle size in the range of from 1 to 500 nanometers and which are distributed throughout the matrix of the exterior water-absorptive coating;
- wherein:
- (e) each nitrogen-containing substance is independently selected from the group consisting of quaternary ammonium mer units, poly(N-vinylpyrrolidinone), copolymer of N-vinylpyrrolidinone and α-(meth)acrylyloxy-ω-(hydroxy, methoxy, or ethoxy)-poly(ethylene oxide), and two or more thereof;
- (f) the hydrophilic organic polymer of the second interior water-absorptive coating contains a greater quantity of nitrogen-containing substance than the hydrophilic organic polymer of the first interior water-absorptive coating, on a percent by weight basis;
- and
- (g) the hydrophilic organic polymer of the second interior water-absorptive coating contains a greater quantity of nitrogen-containing substance than the hydrophilic organic polymer of the exterior water-absorptive coating, on a percent by weight basis.
Dependencies are inferred from the claim text.