Claims
- 1. A coating composition comprising a water soluble polysaccharide composition comprising at least one hydrophobic group selected from the group consisting of aryl, alkyl, alkenyl, aralkyl and mixtures thereof and at least one quaternary ammonium salt group, both connected to a polysaccharide backbone by covalent bonds, wherein the content of the hydrophobic groups is greater than 0.6 weight percent.
- 2. The coating composition of claim 1, wherein the hydrophobic group has at least 10 carbons.
- 3. The coating composition of claim 1, wherein the hydrophobe group has a lower limit of 13 carbons.
- 4. The coating composition of claim 1, wherein the hydrophobic groups have a lower limit of 16 carbons.
- 5. The coating composition of claim 1, wherein the hydrophobic group upper limit is 24 carbons.
- 6. The coating composition of claim 1, wherein the hydrophobic group upper limit is 20 carbons.
- 7. The coating composition of claim 1, wherein the hydrophobic group upper limit is 18 carbons.
- 8. The coating composition of claim 1, wherein the at least one quaternary ammonium salt is selected from the group consisting of 3-chloro-2-hydroxypropyl dimethyldodecyl ammonium chloride, 3-chloro-2-hydroxypropyl dimethyloctadecyl ammonium chloride, 3-chloro-2-hydroxypropyl dimethyloctyl ammonium chloride, 3-chloro-2-hydroxpropyl trimethyl ammonium chloride, 2-chloroethyl trimethyl ammonium chloride, glycidyltrimethylammonium chloride, and 2,3-epoxypropyl trimethyl ammonium chloride.
- 9. The coating composition of claim 8, wherein the at least one quaternary ammonium salt is glycidyltrimethylammonium chloride.
- 10. The coating composition of claim 1, wherein the polysaccharide backbone is selected from the group consisting of hydroxyethylcellulose (EHEC), ethyl hydroxyethylcellulose (HEC), hydroxypropylmethyl cellulose (HPC), methyl cellulose (MC), hydroxypropylmethyl cellulose (HPMC), methyl hydroxyethyl cellulose (MHEC), hydroxyethylmethylcellulose (HEMC), hydroxyethylcarboxymethylcellulose (HECMC), guar, and guar derivatives.
- 11. The coating composition of claim 1, wherein the polysaccharide backbone is hydroxyethylcellulose.
- 12. The coating of claim 1, wherein the content of the hydrophobic groups is greater than 0.8 weight percent.
- 13. The coating of claim 1, wherein the content of the hydrophobic groups is greater than 1.0 weight percent.
- 14. The coating of claim 1, wherein the content of the hydrophobic groups has an upper limit of 2.5 weight percent.
- 15. The coating of claim 1, wherein the quaternary ammonium salt has a degree of substitution of greater than 0.005.
- 16. The coating of claim 1, wherein the quaternary ammonium salt has a degree of substitution with a lower limit of 0.05.
- 17. The coating of claim 1, wherein the quaternary ammonium salt has a degree of substitution with a lower limit of 0.07.
- 18. The coating of claim 1, wherein the quaternary ammonium salt has a degree of substitution with an upper limit of 0.5.
- 19. The coating of claim 1, wherein the quaternary ammonium salt has a degree of substitution with an upper limit of 0.25.
- 20. The coating of claim 1, wherein the quaternary ammonium salt has a degree of substitution with an upper limit of 0.22.
- 21. The coating of claim 1, wherein the polysaccharide backbone starting material has a degree of polymerization of at least about 500.
- 22. The coating of claim 1, wherein the polysaccharide backbone starting material has a degree of polymerization of greater than 750.
- 23. The coating of claim 1, wherein the polysaccharide backbone starting material has a degree of polymerization of greater than 1000.
- 24. The coating composition of claim 1, wherein a synthetic thickener is also present.
- 25. The coating composition of claim 24, wherein the synthetic thickener is a hydrophobically modified polyethylene oxide.
- 26. The coating composition of claim 24, wherein the synthetic thickener is an associative acrylic polymer.
- 27. The coating composition of claim 24, wherein the synthetic thickener is a hydrophobically modified ethoxylated urethane.
- 28. The coating composition of claim 1, wherein the coating composition is a latex based paint.
- 29. The coating composition of claim 28, wherein the latex based paint has a pigment volume concentration greater than 10%.
- 30. The coating composition of claim 29, wherein the upper limit of the pigment volume concentration is 90%.
Parent Case Info
This invention relates to the use of cationically modified associative cellulose ethers as rheology modifiers for waterborne coatings, and more particularly, the use of such cellulose ethers having a quaternary nitrogen-containing cationic moiety and a hydrophobic moiety attached to the backbone of the cellulose ether for improving the leveling in waterborne paints.
US Referenced Citations (2)
Number |
Name |
Date |
Kind |
4663159 |
Brode, II et al. |
May 1987 |
|
5473059 |
Yeh |
Dec 1995 |
|