Inkjet printing media
First Claim
1. A coating composition comprising:
- (a) a volatile aqueous liquid medium; and
(b) binder dissolved or dispersed in the volatile aqueous liquid medium, the binder comprising;
(1) water-soluble film-forming organic polymer which is substantially free of ammonium groups, (2) water-soluble first cationic addition polymer consisting essentially of quaternary ammonium-containing mer units and ammonium-free mer units, and (3) water-soluble second cationic addition polymer consisting essentially of secondary, tertiary, or both secondary and tertiary ammonium-containing mer units and ammonium-free mer units, wherein the binder constitutes from 20 to 90 percent by weight of the solids of the coating composition; and
(c) finely divided substantially water-insoluble filler particles which have a maximum dimension of less than 500 nanometers and constitute from 10 to 80 percent by weight of the solids of the coating composition.
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Abstract
A printing medium comprising a substrate having at least one surface and a coating on the surface wherein the coating comprises: (a) binder comprising: (1) organic polymer which is substantially free of ammonium groups, (2) first cationic addition polymer consisting essentially of quaternary ammonium-containing mer units derived from addition monomer and ammonium-free mer units derived from addition monomer, and (3) second cationic addition polymer consisting essentially of secondary, tertiary, or both secondary and tertiary ammonium-containing mer units derived from addition monomer and ammonium-free mer units derived from addition monomer, wherein the binder constitutes from 20 to 90 percent by weight of the coating; and (b) finely divided substantially water-insoluble filler particles which have a maximum dimension of less than 500 nanometers, are distributed throughout the binder, and constitute from 10 to 80 percent by weight of coating.
107 Citations
15 Claims
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1. A coating composition comprising:
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(a) a volatile aqueous liquid medium; and
(b) binder dissolved or dispersed in the volatile aqueous liquid medium, the binder comprising;
(1) water-soluble film-forming organic polymer which is substantially free of ammonium groups, (2) water-soluble first cationic addition polymer consisting essentially of quaternary ammonium-containing mer units and ammonium-free mer units, and (3) water-soluble second cationic addition polymer consisting essentially of secondary, tertiary, or both secondary and tertiary ammonium-containing mer units and ammonium-free mer units, wherein the binder constitutes from 20 to 90 percent by weight of the solids of the coating composition; and
(c) finely divided substantially water-insoluble filler particles which have a maximum dimension of less than 500 nanometers and constitute from 10 to 80 percent by weight of the solids of the coating composition. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15)
(a) quaternary ammonium-containing mer units constitute from 10 to 95 weight percent of the water-soluble first cationic addition polymer, and (b) ammonium-free mer units constitute from 5 to 90 weight percent of the water-soluble first cationic addition polymer.
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5. The coating composition of claim 2 wherein:
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(a) secondary, tertiary, or both secondary and tertiary ammonium-containing mer units constitute from 10 to 75 weight percent of the water-soluble second cationic addition polymer, and (b) ammonium-free mer units constitute from 25 to 90 weight percent of the water-soluble second cationic addition polymer.
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6. The coating composition of claim 2 wherein at least 10 weight percent of the ammonium-free mer units of the water-soluble second cationic addition polymer are derived from hydrophobic addition monomer.
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7. The coating composition of claim 6 wherein at least 5 percent by weight of the hydrophobic addition monomer contains at least one aromatic hydrocarbon group.
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8. The coating composition of claim 2 wherein:
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(a) the water-soluble film-forming organic polymer which is substantially free of ammonium groups constitutes from 10 to 90 percent by weight of the binder, (b) the water-soluble first cationic addition polymer constitutes from 5 to 85 percent by weight of the binder, (c) the water-soluble second cationic addition polymer constitutes from 5 to 85 percent by weight of the binder.
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9. The coating composition of claim 2 wherein the filler particles have a maximum dimension of less than 100 nanometers.
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10. The coating composition of claim 2 wherein the filler particles have a maximum dimension of less than 50 nanometers.
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11. The coating composition of claim 2 wherein the filler particles constitute from 15 to 65 percent by weight of the solids of the coating composition.
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12. The coating composition of claim 2 wherein the filler particles and the binder together constitute from 2 to 35 percent by weight of the coating composition.
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13. The coating composition of claim 2 wherein the filler particles and the binder together constitute from 5 to 20 percent by weight of the coating composition.
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14. The coating composition of claim 2 wherein water constitutes at least 80 percent by weight of the volatile aqueous liquid medium.
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15. The coating composition of claim 2 wherein the volatile aqueous liquid medium constitutes from 75 to 98 percent by weight of the coating composition.
Specification