Cationic carbonate pigment for ink jet coating ink receptive layer
OwnerJanet Preston, Anthony Lyons +2inventors
InventorsJanet Preston, Anthony Lyons, Bomi Bilimoria, David Skuse
Life of this patent
Estimating the term…
Abstract
The present invention relates to new pigment compositions, coating compositions and methods for making the new compositions, such as coatings for ink jet receiving materials. The coated inkjet receiving material can provide improved printability. The pigment composition can be prepared by dispersing a carbonate pigment with at least one anionic dispersant The predispersed carbonate can then combined with at least one cationic polymer, such as a polyquaternary ammonium polymer or polyamine capable of being converted to a polyquaternary ammonium polymer.
Claims74
A pigment composition, comprising:
- at least one calcium carbonate chosen from rhombohedral calcium carbonate and ground calcium carbonate;
- at least one anionic dispersant present in an amount sufficient to overdisperse the at least one calcium carbonate;
- and
- at least one cationic polymer.
A method of preparing a pigment, comprising:
- combining at least one anionic dispersant with at least one calcium carbonate chosen from rhombohedral calcium carbonate and ground calcium carbonate, the at least one anionic dispersant being present in an amount effective to overdisperse the at least one calcium carbonate;
- and
- combining at least one cationic polymer with the dispersed calcium carbonate.
A paper coating composition, comprising:
- at least one calcium carbonate chosen from rhombohedral calcium carbonate and ground calcium carbonate;
- at least one anionic dispersant present in an amount effective to overdisperse the at least one calcium carbonate;
- at least one cationic polymer;
- and
- at least one binder.
A coated paper, comprising:
- a fibrous substrate:
- at least one calcium carbonate chosen-from rhombohedral calcium carbonate and ground calcium carbonate;
- at least one anionic dispersant present in an amount effective to overdisperse the at least one calcium carbonate;
- at least one cationic polymer in an amount of at least about 2 weight percent, relative to the weight of the calcium carbonate;
- and
- at least one binder.
A method of preparing a pigment, comprising:
- (a) adding substantially simultaneously to a vessel, at least one anionically dispersed carbonate slurry and at least one cationic polymer, to form a cationic carbonate slurry;
- and
- (b) removing the cationic carbonate slurry from the vessel at a rate equal to the sum of the rate of the cationic polymer and dispersed carbonate slurry addition in (a).
A pigment composition, comprising:
- at least one rhombohedral calcium carbonate;
- at least one anionic dispersant;
- and
- at least one cationic polymer.
Dependencies are inferred from the claim text.