Dispersions made from treated inorganic particles for making decor paper having improved optical performance
View Patent ↗The disclosure provides a dispersion for making décor paper having improved optical performance without negatively impacting mechanical strength comprising a TiO 2 particle slurry comprising a treated TiO 2 particle having a surface area of at least about 30 m 2 /g, and a cationic polymer; wherein the treatment comprises an oxide of silicon, aluminum, phosphorus or mixtures thereof; and the treatment is present in the amount of at least 15% based on the total weight of the treated titanium dioxide particle; paper pulp; and a cationic polymer; wherein the cationic polymer in the slurry and the cationic polymer in the dispersion are compatible; wherein for equal optical performance, the amount of treated TiO 2 particle in the dispersion is reduced by about 10% when compared to a dispersion not comprising the treated TiO 2 particle of (a). These dispersions are useful in making décor paper that may be used in paper laminates.
1. A dispersion for making décor paper having improved optical performance without negatively impacting mechanical strength comprising:
(a) a TiO 2 particle slurry comprising a treated TiO 2 particle having a surface area of at least about 30 m 2 /g, and a cationic polymer; wherein the treatment comprises an oxide of silicon, aluminum, phosphorus or mixtures thereof; and the treatment is present in the amount of at least 15% based on the total weight of the treated titanium dioxide particle;
(b) paper pulp; and
(c) a cationic polymer; wherein the cationic polymer in the slurry and the cationic polymer in the dispersion are compatible; wherein for equal optical performance, the amount of treated TiO 2 particle in the dispersion is reduced by about 10% when compared to a dispersion not comprising the treated TiO 2 particle of (a).
2. The dispersion of claim 1 wherein the TiO 2 particle is a pigment.
3. The dispersion of claim 1 wherein the cationic polymer in the slurry is a urea-formaldehyde resin, a melamine-formaldehyde resin, a cationic polyacrylamide polymer, a polydialkyllammonium polymer, a polyacrylamide-polydialkylammonium copolymer, or a polyamide-polyamine-epichlorhydrin resin.
4. The dispersion of claim 1 wherein the cationic polymer (c) in the dispersion is a urea-formaldehyde resin, a melamine-formaldehyde resin or a polyamide-polyamine-epichlorhydrin resin.
5. The dispersion of claim 1 wherein the silica treatment level is at least about 6% by weight, based on the total weight of the treated TiO 2 pigment.
6. The dispersion of claim 5 wherein the silica treatment level is at least about 6% to about 14%, by weight, based on the total weight of the treated TiO 2 pigment.
7. The dispersion of claim 1 wherein the alumina treatment level is about 4 to about 8%, based on the total weight of the treated TiO 2 pigment.
8. The dispersion of claim 7 wherein the alumina treatment level is about 5.5 to about 6%, based on the total weight of the treated TiO 2 pigment.
9. The dispersion of claim 1 wherein the TiO 2 particle has a particle size of about 0.02 to about 0.95 microns.
10. The dispersion of claim 1 wherein the TiO 2 particle has a particle size of about 0.5 to about 0.75 microns.
11. The dispersion of claim 1 wherein the TiO 2 particle is a pyrogenic TiO 2 particle.
12. The dispersion of claim 11 wherein the silica is applied by deposition of pyrogenic silica onto a pyrogenic TiO 2 particle, co-oxygenation of silicon tetrachloride with titanium tetrachloride or by deposition via condensed phase aqueous oxide.
13. The dispersion of claim 1 wherein the silica is applied by deposition via condensed phase aqueous oxide.
14. The dispersion of claim 12 wherein the silica is applied by deposition via condensed phase aqueous oxide.
15. The dispersion of claim 12 wherein the silica, alumina or both are substantially homogenous on the surface of the TiO 2 particle.