초록

A paper sizing composition is provided, which comprises a water-soluble salt of Ca(II) and at least one organic acid; and starch. Methods of making and using the composition, and methods of making and using the recording sheets which include the composition, are disclosed.

대표청구항 ▼

1. A paper, sizing composition, comprising: a water-soluble salt of Ca(II) and at least one organic acid; andstarch, wherein the salt is not calcium acetate calcium formate or calcium stearate. 2. The composition of claim 1, wherein said salt is present in an amount ranging from 0.1 to 50% by weight

1. A paper, sizing composition, comprising: a water-soluble salt of Ca(II) and at least one organic acid; andstarch, wherein the salt is not calcium acetate calcium formate or calcium stearate. 2. The composition of claim 1, wherein said salt is present in an amount ranging from 0.1 to 50% by weight of the sizing composition. 3. The composition of claim 1, wherein the salt has a water solubility of greater than 0.002 grams salt/100 cc of water, at 25° C. 4. The composition of claim 1, wherein the organic acid has the formula RCOOH, wherein R is a hydrocarbon having 2-16 or 18-30 carbon atoms. 5. The composition of claim 1, wherein the organic acid is zwitterionic or amphoteric. 6. The composition of claim 1, wherein the salt is a salt having two identical organic acids. 7. The composition of claim 1, wherein the salt is a complex salt having two or more different organic acids. 8. The composition of claim 1, wherein the salt is calcium propionate, calcium lactate, calcium tartrate, calcium gluconate, calcium citrate, calcium lactate gluconate, calcium 2-ethylbutanoate, calcium EDTA, calcium DTPA, or a mixture thereof. 9. The composition of claim 1, wherein the salt is calcium propionate, calcium lactate, calcium tartrate, calcium gluconate, calcium citrate, calcium lactate gluconate, calcium 2-ethylbutanoate, or a mixture thereof. 10. The composition of claim 1, wherein the starch is present in an amount ranging from 0.1 to 75% by weight of the sizing composition. 11. The composition of claim 1, which further comprises an optical brightening agent. 12. A method for making the composition of claim 1, comprising contacting a water-soluble salt of Ca(II) and at least one organic acid; andstarch;to produce the composition of claim 1. 13. A recording sheet, comprising: a paper substrate, comprising: a plurality of cellulosic fibers; anda paper sizing composition, comprising: a water-soluble salt of Ca(II) and at least one organic acid; andstarch;wherein the salt is not calcium acetate calcium formate or calcium stearate. 14. The recording sheet of claim 13, wherein the water soluble Ca(II) salt of the organic acid is present in an amount ranging, from about 2 to about 100 lbs Ca(II) salt/ton of paper. 15. The recording sheet of claim 13, wherein the water soluble Ca(II) salt is present in an amount ranging from about 0.02 g/m2 to about 4 g/m2. 16. The recording sheet of claim 13, wherein the starch is present in an amount ranging from about 5 to about 300 lbs/ton. 17. The recording sheet of claim 13, wherein the dry pickup of the sizing composition ranges from 0.25 to 8 gsm. 18. The recording sheet of claim 13, wherein the sizing composition is an internal sizing. 19. The recording sheet of claim 13, wherein the sizing composition is an external sizing. 20. The recording sheet of claim 13, wherein the sizing composition is an internal and an external sizing. 21. The recording sheet of claim 13, comprising a printed image thereon. 22. A method for making a recording sheet, comprising: contacting: a paper substrate comprising a plurality of cellulosic fibers; anda composition, comprising: a water-soluble salt of Ca(II) and at least one organic acid; andstarch;to produce a recording sheet; wherein the salt is not calcium acetate calcium formate or calcium stearate. 23. A method, comprising forming an image with a printing apparatus on a surface of a recording sheet, said recording sheet comprising: a paper substrate comprising: a plurality of cellulosic fibers; anda composition, comprising: a water-soluble salt of Ca(II) and at least one organic acid; andstarch;wherein the salt is not calcium acetate calcium formate or calcium stearate. 24. The recording sheet of claim 13, wherein the salt is calcium propionate, calcium lactate, calcium tartrate, calcium gluconate, calcium citrate, calcium lactate gluconate, calcium 2-ethylbutanoate, calcium EDTA, calcium DTPA, or a mixture thereof. 25. The recording sheet of claim 13, wherein the salt is calcium propionate, calcium lactate, calcium tartrate, calcium gluconate, calcium citrate, calcium lactate gluconate, calcium 2-ethylbutanoate, or a mixture thereof. 26. The method of claim 22, wherein the salt is calcium propionate, calcium lactate, calcium tartrate, calcium gluconate, calcium citrate, calcium lactate gluconate, calcium 2-ethylbutanoate, calcium EDTA, calcium DTPA, or a mixture, thereof. 27. The method of claim 22, wherein the salt is calcium propionate, calcium lactate, calcium tartrate, calcium gluconate, calcium citrate, calcium lactate gluconate, calcium 2-ethylbutanoate, or a mixture thereof. 28. The method of claim 23, wherein the salt is calcium propionate, calcium lactate, calcium tartrate, calcium gluconate, calcium citrate, calcium lactate gluconate, calcium 2-ethylbutanoate, calcium EDTA, calcium DTPA, or a mixture thereof. 29. The method of claim 23, wherein the salt is calcium propionate, calcium lactate, calcium tartrate, calcium gluconate, calcium citrate, calcium lactate gluconate, calcium 2-ethylbutanoate, or a mixture thereof. 30. The composition of claim 1, wherein said salt is present in an amount ranging from 0.1 to 45% by weight of the sizing composition. 31. The composition of claim 1, wherein the organic acid has more than one carboxylic acid group. 32. The composition of claim 4, wherein one or more of the carbons in the hydrocarbon R group is substituted with one or more N, S, O, or P. 33. The composition of claim 4, wherein the hydrocarbon R group is a saturated, monounsaturated, or polyunsaturated C2-C5 alkyl, C1-C5 hydroxyalkyl, or phenyl group.