Claims
- 1. A modified starch composition made by combining a starch with a polymer and cooking the combined starch and polymer composition under acidic conditions, the cooking producing anionic groups on the polymer.
- 2. A modified starch composition according to claim 1 wherein the anionic groups are selected from the group consisting of acid groups, salts of acid groups, and combinations thereof.
- 3. A modified starch composition according to claim 2 wherein the polymer before cooking is cationic, anionic, amphoteric or non-ionic polyacrylamide, and wherein the cooking produces acrylic acid groups on the polymer.
- 4. A modified starch composition according to claim 1 further including an aluminum compound combined with the starch composition prior to cooking the starch composition.
- 5. A furnish including the modified starch composition of claim 1.
- 6. A furnish according to claim 5 further including an inorganic and/or organic colloid.
- 7. A furnish according to claim 5 further including an aluminum compound.
- 8. A modified starch composition made by cooking a starch and combining the cooked starch with a cooked polymer, the cooking producing anionic groups on the polymer, and the polymer having been cooked separately from the starch.
- 9. A modified starch composition according to claim 8 wherein the anionic groups are selected from the group consisting of acid groups, salts of acid groups, and combinations thereof.
- 10. A modified starch composition according to claim 9 wherein the polymer before cooking is cationic, anionic, amphoteric or non-ionic polyacrylamide, and wherein the cooking produces acrylic acid groups on the polymer.
- 11. A modified starch composition according to claim 8 further including an aluminum compound combined with the starch prior to cooking the starch.
- 12. A furnish including the modified starch composition of claim 8.
- 13. A furnish according to claim 12 further including an inorganic and/or organic colloid.
- 14. A furnish according to claim 12 further including an aluminum compound.
- 15. A method of making a modified starch composition, the method comprising combining a starch with a polymer to form a starch composition, and cooking the starch composition under acidic conditions, the cooking producing anionic groups on the polymer.
- 16. A method according to claim 15 wherein the anionic groups are acid groups, wherein the modified starch composition has a pH lower than the pKa of the acid groups, and wherein the method comprises an additional step of raising the pH of the modified starch composition to a level greater than or equal to the pKa of the acid groups.
- 17. A method according to claim 15 wherein the anionic groups are acid groups, and wherein the modified starch composition has a pH greater than the pKa of the acid groups.
- 18. A method according to claim 15 comprising an additional step of combining an aluminum compound with the starch composition prior to cooking the starch composition.
- 19. A method of making a modified starch composition, the method comprising cooking a starch, cooking a polymer separately from the starch, and combining the cooked starch with the cooked polymer, the cooking producing anionic groups on the polymer.
- 20. A method according to claim 19 wherein the anionic groups are acid groups, wherein the modified starch composition has a pH lower than the pKa of the acid groups, and wherein the method comprises an additional step of raising the pH of the modified starch composition to a level greater than or equal to the pKa of the acid groups.
- 21. A method according to claim 19 wherein the anionic groups are acid groups, and wherein the modified starch composition has a pH greater than the pKa of the acid groups.
- 22. A method according to claim 19 comprising an additional step of combining an aluminum compound with the starch prior to cooking the starch.
- 23. A dry mix comprising a dry mixture of starch and polyacrylamide which can be cooked under acidic, basic or neutral conditions.
- 24. A dry mix according to claim 23 further including a pH adjuster.
- 25. A dry mix according to claim 23 further including an aluminum compound.
CROSS-REFERENCE TO RELATED APPLICATION
[0001] This application claims the benefit of U.S. provisional application serial No. 60/450,277, filed Feb. 27, 2003.
Provisional Applications (1)
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Number |
Date |
Country |
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60450277 |
Feb 2003 |
US |