Recording sheet with improved image waterfastness, surface, strength, and runnability
AssigneeInternational Paper Company
InventorsMichael F. Koenig, Kapil M. Singh
Life of this patent
Estimating the term…
Abstract
The present invention relates to a sizing or coating composition that, when applied to paper substrate, creates a substrate having improved waterfastness, surface strength, and surface strength as measured by resistance to abrasion. In addition, the present invention relates to paper substrates containing the composition, as well as methods of using and making the paper substrate and composition.
Claims20
1) A sizing or coating composition, comprising
- at least one binder;
- at least one dye fixative;
- and
- at least one crosslinking agent.
) The sizing or coating composition according to claim 1, further comprising at least one inorganic salt.
) The composition according to claim 1, wherein the at least one binder is present at an amount ranging from 85 to 98 wt % based upon the total weight of the solids in of the composition.
) The composition according to claim 1, wherein the at least one dye fixative is present at an amount ranging from 0.5 to 10 wt % based upon the total weight of the starch in of the composition.
) The composition according to claim 1, wherein the at least one crosslinking agent is present at an amount ranging from 0.5 to 5 wt % based upon the total weight of the starch in of the composition.
) The composition according to claim 1, wherein the at least one binder is at least one member selected from the group consisting of starch, modified starch and polyvinyl alcohol.
) The composition according to claim 1, wherein the at least one dye fixative is at least one member selected from the group consisting of a polyamine, a polyeneimine, and an optical brightening agent:nitrogen-containing compound complex.
) The composition according to claim 1, wherein the at least one crosslinking agent is at least one member selected from the group consisting of glyoxal and blocked glyoxal.
) The composition according to claim 1, comprising
- the at least one binder at an amount of 85 to 98 wt % based upon the total weight of the solids in of the composition;
- at least dye fixative at an amount ranging from 0.5 to 10 wt % based upon the total weight of the starch in of the composition;
- and
- at least one crosslinking agent at an amount ranging from 0.25 to 5 wt % based upon the total weight of the starch in of the composition.
) The composition according to claim 10, wherein
- the at least one binder is selected from the group consisting of starch and polyvinyl alcohol;
- the at least one dye fixative is selected from the group consisting of a polyamine, a polyeneimine, and an optical brightening agent:nitrogen-containing compound complex;
- and
- the at least one crosslinking agent is selected from the group consisting of glyoxal and blocked glyoxal.
) A paper substrate, comprising the composition according to claim 11.
) The paper substrate according to claim 12, comprising an effective amount of the composition such that the substrate has a waterfastness as measured by DL % of from −10 to 15.
) The paper substrate according to claim 12, comprising an effective amount of the composition such that the substrate has a waterfastness as measured by DL % is from −5 to 55.
) The paper substrate according to claim 12, comprising an effective amount of the composition such that the substrate has a surface strength that is less than 60 mg/1000 revolutions as measured by the Taber Abrasion test.
) The paper substrate according to claim 12, comprising an effective amount of the composition such that the substrate has a surface strength that is less than 50 mg/1000 revolutions as measured by the Taber Abrasion test.
) The paper substrate according to claim 12, comprising an effective amount of the composition such that the substrate has a surface strength that is less than 40 mg/1000 revolutions as measured by the Taber Abrasion test.
) The paper substrate according to claim 12, comprising an effective amount of the composition such that the substrate;
- when in a roll that is 36 inches wide, 50 inches in diameter, and having a 3 inch core, runs continuously for greater than half of a total length of the roll.
) The paper substrate according to claim 12, comprising an effective amount of the composition such that the substrate;
- when in a roll that is 36 inches wide, 50 inches in diameter, and having a 3 inch core, runs continuously for at least two lengths of the roll.
) A method of making the paper substrate according to claim 12, comprising contacting a web of fibers with the composition at a size press or at a coater.
Dependencies are inferred from the claim text.