Claims
- 1. A paper containing pigment and alum and having dispersed therein as a pigment retention aid a starch derivative of an ungelatinized starch base having a water fluidity between 4 and 40, said starch derivative containing chemically introduced sulfo-succinate groups and cationogenic or cationic nitrogen containing substituent groups selected from the group consisting of primary amine, secondary amine, tertiary amine, and quaternary ammonium groups, wherein the degree of substitution in said starch derivative is about 0.008 to 0.20 with respect to said sulfo-succinate groups and about 0.005 to 0.50 with respect to said nitrogen containing substituent groups, said paper being prepared from a papermaking stock containing more than 4% alum by weight of dry pulp and from about 0.05 to 2.0% of said starch derivative by weight of dry pulp.
- 2. The paper of claim 1, wherein the degree of substitution of said sulfo-succinate groups in said starch derivative is from about 0.02 to 0.06.
- 3. The paper of claim 1, wherein the starch base is corn starch or phosphate substituted corn starch.
- 4. The paper of claim 3, wherein said cationic or cationogenic nitrogen containing groups in said starch derivative are tertiary amine groups and the degree of substitution with respect to said tertiary amine groups is about 0.02 to about 0.04.
- 5. In a method for making paper containing pigment and alum, the step which comprises adding, as a pigment retention aid, to the stock containing more than 4% alum by weight of dry pulp, at any stage prior to forming a web, a starch derivative of an ungelatinized starch having a water fluidity between 4 and 40, said starch derivative containing chemically introduced sulfo-succinate groups and cationogenic or cationic nitrogen containing substituent groups selected from the group consisting of primary amine, secondary amine, tertiary amine, and quaternary ammonium groups, wherein the degree of substitution in said starch derivative is about 0.008 to 0.20 with respect to said sulfo-succinate groups and about 0.005 to 0.50 with respect to said nitrogen containing substituent groups, said starch derivative being added to the stock in an amount of from about 0.05 to 2.0% by weight of dry pulp.
- 6. The method of claim 5, wherein the degree of substitution of said sulfo-succinate groups in said starch derivative is from about 0.02 to 0.06.
- 7. The method of claim 5, wherein the starch base is corn starch or phosphate substituted corn starch.
- 8. The method of claim 7, wherein said cationic or cationogenic nitrogen containing groups in said starch derivative are quaternary ammonium groups.
- 9. The method of claim 7, wherein said cationic or cationogenic nitrogen containing groups in said starch derivative are tertiary amine groups and the degree of substitution with respect to said tertiary amine groups is about 0.02 to about 0.04.
Parent Case Info
This is a continuation-in-part application of our co-pending application Ser. No. 517,450 filed Oct. 24, 1974, now abandoned.
US Referenced Citations (3)
Number |
Name |
Date |
Kind |
2461139 |
Caldwell |
Feb 1949 |
|
3459632 |
Caldwell et al. |
Aug 1969 |
|
3467647 |
Benninga |
Sep 1969 |
|
Continuation in Parts (1)
|
Number |
Date |
Country |
Parent |
517450 |
Oct 1974 |
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