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

• US 20070044929A1
• Filed: 03/13/2006
• Published: 03/01/2007
• Est. Priority Date: 03/11/2005
• Status: Active Grant

• Current Assignee: International Paper Company
• Original Assignee: International Paper Company
• Inventors: Froass, Peter, Hong, Yaoliang, Young, Herbert, Mohan, Krishna, Anderson, D., Faber, Richard, Goliber, Cynthia
• Granted Patent: US 8,034,847 B2
• Time in Patent Office: Days
• US Class Current: 162/158
• 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 0.1 M., as well as methods of making and using the composition.

Claims

20-1. A method of making the composition according to claim 1, comprising

contacting the at least one expandable microsphere with the

at least one ionic compound to form a mixture.

28. A paper or paperboard substrate, comprising

a plurality of cellulose fibers;

from 0.1 to 5 wt % of a plurality of expandable microspheres;

wherein the substrate has a Sheffield Smoothness of less than 250 SU as measured by TAPPI test method T 538 om-1; and

a scanning 2^nd cyan print mottle of not more than 6.

29. The substrate according to claim 28, wherein an outside surface of the expandable microspheres are bound to an ionic compound.

30. The substrate according to claim 28, comprising from 0.1 to 3 wt % of a plurality of expandable microspheres.

31. The substrate according to claim 28, comprising from 0.1 to 2 wt % of a plurality of expandable microspheres.

32. The substrate according to claim 28, further comprising at least one coating layer.

33. The substrate according to claim 28, wherein the coating layer comprises at least one top coat and at least one base coat.

34. The substrate according to claim 28, wherein the Sheffield Smoothness is less than 250 SU and the scanning print mottle is less than 6 after calendaring said substrate, as measured by TAPPI test method T 538 om-1.

35. The substrate according to claim 28, wherein the substrate has a Parker Print Surface Smoothness of from about 1.0 to 0.5 as measured by TAPPI test method T 555 om-99

36. An article, comprising the substrate according to claim 28.

37. The article according to claim 33, wherein the article is a folding carton.

38. An article, comprising

at least one paper or paperboard substrate wherein as least one substrate comprises a web of cellulose fibers and a bulking agent;

wherein the article weighs equal to or less than one ounce; and

wherein the article has a weight whose difference from 1 ounce is an absolute value that is more than that of a conventional package having the same number of layers.