Stable and aqueous compositions of polyvinylamines with cationic starch, and utility for papermaking
View Patent ↗A stable aqueous composition comprising polyvinylamine and liquid cationic starch in a ratio of from 90 to 55 parts of polyvinylamine on active basis to 10 to 45 parts of liquid cationic starch on active basis is disclosed. The composition can be used in papermaking as a strength or as a drainage aid.
1. A stable aqueous composition comprising polyvinylamine and liquid cationic starch in a ratio of from 90 to 55 parts of polyvinylamine on active basis to 10 to 45 parts of liquid cationic starch on active basis, wherein the combined parts in active of liquid cationic starch and polyvinylamine comprise at least 40 weight % of the total solids of the composition wherein the Brookfield viscosity of the composition is in the range of 500 to 4000 cps using spindle #3 at 30 rpm and 25° C.
2. The composition of claim 1 wherein said the polyvinylamine comprises a vinylamine polymer selected from the group consisting of vinylamine homopolymer, fully or partially hydrolyzed from polyvinylformamide, vinylamine copolymers, vinylamine terpolymers, and vinylamine-containing polymers chemically modified after polymerization.
3. The composition of claim 2 wherein the polyvinylamine comprises fully or partially hydrolyzed polyvinylformamide.
4. The composition of claim 2 wherein the polyvinylamine comprises a vinylamine homopolymer.
5. The composition of claim 1 wherein the liquid starch is a cationic liquid starch derived from waxy maize.
6. The composition of claim 1 wherein the liquid starch is a cationic liquid starch prepared from waxy maize starch which has been cationically modified using 3- chloro-2-hydroxypropyltrimethylammoniurn chloride.
7. The composition of claim 5 wherein the cationic liquid starch has a nitrogen content in the range of from about 0.01 to 2.5%.
8. The composition of claim 5 wherein the solids content of the liquid starch is in the range of from 15 to 35%.
9. The composition of claim 5 wherein the solids content of the liquid starch is in the range of from 20 to 30%.
10. The composition of claim 5 wherein the Brookfield viscosity of the liquid starch having a solids content of from about 10 to 40% is in the range of from 2,000 to 20,000 cps using a number 3 spindle at 30 rpm and 25° C.
11. The composition of claim 1 wherein the polyvinylamine comprises a vinylamine polymer selected from the group consisting of vinylamine homopolymer, fully or partially hydrolyzed polyvinylformamide, and the liquid starch is a liquid cationic starch derived from waxy maize.
12. The composition of claim 1 wherein the polyvinylamine comprises from 60-80 parts of the composition based on actives and liquid cationic starch comprises from 20-40 parts of the composition based on actives.
13. The composition of claim 1 wherein the polyvinylamine comprises from 65-80 parts of the composition based on actives and the liquid cationic starch comprises from 20-35 parts of the composition based on actives.
14. The composition of claim 1 wherein the polyvinylamine comprises from 70-80 parts of the composition based on active and the liquid cationic starch comprises from 20-30 parts of the composition based on active.
15. The composition of claim 1 wherein the combined parts based on actives of liquid cationic starch and polyvinylamine comprise at least 50 weight % of the total solids of the composition.
16. A process of making paper or paperboard product wherein the composition of claim 1 is added to a pulp slurry in an amount ranging from 0.02 to 0.5 weight % actives based on the weight of the finished dry paper or paperboard.
17. The process of claim 16 wherein the amount ranges from 0.15 to 0.5%.
18. The process of claim 16 wherein the composition is added to the papermaking slurry wherein the papermaking slurry further comprises other papermaking additives selected from the group consisting of cationic, anionic, or amphoteric polyacrylamides, polyacrylic acid, copolymers of acrylamide and acrylic acid, carboxymethyl cellulose; crosslinked polyamidoamine, polydiallyldimethylammonium chloride, polyamine; polymeric aldehyde-functional compounds, glyoxalated polyacrylamides, aldehyde celluloses and aldehyde functional polysaccharides, polysaccharides, alum, clay, talc, titanium dioxide, calcium carbonate, pigments, dyes, rosin, sizing agents, and enzymes.
19. The process of claim 18 wherein the other papermaking additives is selected from the group consisting of anionic polyacrylamides, cationic polyacrylamides and mixtures thereof.
20. The process of claim 18 wherein the other papermaking additives comprise glyoxalated polyacrylamides.
21. A stable aqueous composition for papermaking comprising polyvinylamine and liquid cationic starch in a ratio of from 90 to 55 parts of polyvinylamine on an active basis to 10 to 45 parts of liquid cationic starch on an active basis, wherein the combined parts in active of liquid cationic starch and polyvinylamine comprise at least 40 weight % of the total solids of the composition wherein the Brookfield viscosity of the composition is in the range of 500 to 4000 cps using spindle #3 at 30 rpm and 25° C.