Compositions containing expandable microspheres and an ionic compound as well as methods of making and using the same

• US 8,030,365 B2
• Filed: 03/26/2009
• Issued: 10/04/2011
• Est. Priority Date: 03/11/2005
• Status: Expired due to Fees

• Current Assignee: International Paper Company
• Original Assignee: International Paper Company
• Inventors: Young, Herbert, Mohan, Krishna K, Goliber, Cynthia A, Faber, Richard D, Froass, Peter M, Hong, Yaoliang, Anderson, Dennis W.
• Primary Examiner(s): Gulakowski; Randy
• Assistant Examiner(s): BOYLE, KARA BRADY
• Application Number:
  US12/383,667
• Publication Number:
  US 20100032114A1
• Time in Patent Office: 922 Days
• Field of Search: 521/50, 521/56
• US Class Current: 521/56
• CPC Class Codes: D21H 17/41 containing ionic groups
• CPC Class Codes: D21H 17/56 Polyamines; Polyimines; Polyester-imides
• CPC Class Codes: D21H 17/68 siliceous, e.g. clays
• CPC Class Codes: D21H 17/69 modified, e.g. by association with other compositions prior to incorporation in the pulp or paper
• CPC Class Codes: D21H 21/22 Agents rendering paper porous, absorbent or bulky
• CPC Class Codes: D21H 21/54 being spherical, e.g. microcapsules, beads
• CPC Class Codes: D21H 23/04 Addition to the pulp; After-treatment of added substances in the pulp
• CPC Class Codes: D21H 23/08 by measuring pulp properties, e.g. zeta potential, pH
• CPC Class Codes: Y10T 428/1303 Paper containing [e.g., paperboard, cardboard, fiberboard, etc.]

Abstract

This invention relates to composition containing expandable microspheres and at least one ionic compound and having a zeta potential that is greater than or equal to zero mV at a pH of about 9.0 or less at an ionic strength of from 10⁻⁶ M to 0.1M., as well as methods of making and using the composition.

Claims

1. A paper substrate, comprising

a plurality of cellulose fibers;

and

a composition comprising at least one expandable microsphere and at least one ionic compound, wherein said composition has a zeta potential that is greater than or equal to zero mV at a pH of about 9.0 or less at an ionic strength of from 10<sup>−

6</sup> M to 0.1M and said ionic compound being adsorbed onto an outside surface of said expandable microsphere to form a particle including said expandable microsphere having said ionic compound layered thereon.

2. The paper substrate according to claim 1, wherein said zeta potential is greater than zero mV.

3. The paper substrate according to claim 1, wherein said zeta potential ranges from greater than zero to +150 mV.

4. The paper substrate according to claim 1, wherein said zeta potential ranges from greater than +20 to +130 mV.

5. The paper substrate according to claim 1, wherein said ionic compound is at least one compound selected from the group consisting of an organic and inorganic ionic compound.

6. The paper substrate according to claim 1, wherein said ionic compound is at least one polyorganic compound.

7. The paper substrate according to claim 1, wherein said ionic compound is at least one polyamine compound.

8. The paper substrate according to claim 1, wherein said ionic compound is crosslinked, branched, or combinations thereof.

9. The paper substrate according to claim 1, wherein said ionic compound is at least one polyethyleneimine compound.

10. The paper substrate according to claim 1, wherein said ionic compound is at least one polyethyleneimine compound having a molecular weight of at least 600 weight average molecular weight.

11. The paper substrate according to claim 1, wherein said ionic compound is at least one polyethyleneimine compound having a molecular weight of from 600 to 40,000 weight average molecular weight.

12. The paper substrate according to claim 1, wherein said ionic compound is cationic.

13. The paper substrate according to claim 1, wherein said ionic compound comprises at least one member selected from the group consisting of alumina and silica.

14. The paper substrate according to claim 1, wherein said ionic compound comprises a colloid comprising at least one member selected from the group consisting of silica, alumina, tin oxide, zirconia, antimony oxide, iron oxide, and rare earth metal oxides.

15. The paper substrate according to claim 1, wherein said ionic compound comprises a sol comprising at least one member selected from the group consisting of silica, alumina, tin oxide, zirconia, antimony oxide, iron oxide, and rare earth metal oxides.