Patent EA-003067-B1 (EA)
Title: Formulation suitable for ink receptive coatings
Inventor: CHAPMAN DAVID M
IPC: C08K3/00
Filed: 1999-06-22
Abstract: 1. A formulation comprising (a) inorganic oxide particles having i) a median particle size in the range of 0.05 to 3 microns; and ii) porosity such that when an aqueous dispersion of the particles is dried at least 0.5 cc/g of pore volume as measured by BJH nitrogen porosimetry is from pores having a pore size of 600Angstrom or smaller: and (b) binder. 2. A formulation of claim 1 wherein the inorganic oxide particles comprise silica particles. 3. A formulation of claim 2 wherein the silica particles comprise precipitated silica or silica gel. 4. A formulation of claim 2 wherein the silica particles have a porosity after drying in which at least about 0.7 cc/g of the pore volume is from pores having a pore size of 600Angstrom or less. 5. A formulation of claim 4 wherein the silica particles comprise silica gel. 6. A formulation of claim 1 wherein the porous particles have a viscosity derived pore volume of at least 0.5 cc/g. 7. A formulation of claim 6 wherein the porous particles comprise silica. 8. A formulation of claim 7 wherein the porous particles have a viscosity derived pore volume in the range of about 0.5 to about 1.5 cc/g. 9. A formulation of claim 7 wherein the porous particles have a viscosity derived pore volume of about 1.0 to about 1.5 cc/g. 10. A formulation of claim 1 comprising 1-80% by weight inorganic oxide particles. 11. A formulation of claim 10 wherein the particles comprise silica gel and the particles have a porosity after drying in which at least about 0.7 cc/g of the pore volume is from pores having a pore size less than 600Angstrom 12. A formulation of claim 10 wherein the porous particles have a viscosity derived pore volume in the range of 0.5 to about 1.5 cc/g. 13. A formulation of claim 10 wherein the porous particles have a viscosity derived pore volume of about 1.0 to about 1.5 cc/g. 14. A formulation of claim 1 wherein the weight ratio of (a) to (b) is in the range of about 1:1 to about 4:1. 15. A formulation of claim 1 wherein the weight ratio of (a) to (b) is about 1:1 to about 1:50. 16. A formulation of claim 1 wherein (b) is a member of the group consisting of polyvinyl alcohol, polyvinyl acetate, cellulose derivatives, polyvinyl pyrolidone, starch oxides, modified starches, gelatins, acrylic acid polymers, and a mixture of two or more thereof. 17. A formulation of claim 1 further comprising a dye mordant. 18. A formulation of claim 17 wherein the dye mordant is an ionic polymer. 19. A formulation of claim 18 wherein the ionic polymer is polyethylene imine or diallyl dimethyl ammonium chloride. 20. A formulation of claim 1 wherein the porous inorganic oxide particles are silica gel particles having a zeta potential of at least +20 mV. 21. A formulation of claim 21 wherein the silica gel particles have a zeta potential of at least +40 mV. 22. A formulation of claim 20 wherein the silica gel particles are modified by a member of the group consisting of alumina, cation-containing silane, and ionic polymer. 23. A formulation of claim 1 wherein the porous particles have a viscosity derived pore volume of about 1.0 to about 1.5 cc/g. 24. A coated substrate comprising a substrate and at least one layer thereon comprising (a) inorganic oxide particles having  i) a median particle size in the range of 0.05 to 3 microns; and ii) porosity such that when an aqueous dispersion of the particles is dried at least 0.5 cc/g of pore volume as measured by BJH nitrogen porosimetry is from pores having a pore size of 600Angstrom or smaller; and (b) binder. 25. A coated substrate of claim 24 wherein the substrate is paper or film. 26. A coated substrate of claim 24 wherein the coated substrate is ink jet paper. 27. A coated substrate of claim 24 wherein the coating has an ink capacity in the range of 3 to 50 cc per 10 grams of coating. 28. A coated substrate of claim 27 wherein the coating has an ink capacity in the range of 8-12 cc per 10 grams of coating. 29. A coated substrate of claim 24 wherein at least one layer comprises polyvinyl alcohol binder. 30. A coated substrate of claim 24 wherein the porous inorganic oxide particles are silica particles having a zeta potential of at least +20 mV. 31. A coated substrate of claim 30 wherein the silica particles have a zeta potential of at least +40 mV. 32. A coated substrate of claim 30 wherein the silica particles are modified by a member of the group consisting of alumina, cation-containing silane, and cationic polymer. 33. A dispersion comprising porous inorganic oxide particles having: (a) a median particle size in the range of 0.05 to about 3 microns; and (b) porosity such that when an aqueous dispersion of the particles is dried at least about 0.5 cc/g of pore volume as measured by BJH nitrogen porosimetry is from pores having a pare size of 600Angstrom or smaller; wherein the inorganic oxide particles have a zeta potential of at least +20 mV. 34. A dispersion of claim 32 wherein the inorganic oxide particles have a zeta potential of at least +40 mV. 35. A dispersion of claim 33 wherein the inorganic oxide particles are silica particles which have been modified by a member of the group consisting of alumina, cation-containing silane and cationic polymer.