Claims
- 1. A water soluble copolymer useful as an inorganic pigment dispersant comprised of a polymerized (1) monomer which is an ethylenically unsaturated organic phosphate or phosphonate and (2) an ethylenically unsaturated carboxylated monomer, wherein the amount of the ethylenically unsaturated carboxylated monomer is sufficient to permit the copolymer to associate with an inorganic pigment in an aqueous medium in a manner which disperses the inorganic pigment in the aqueous medium to form a stable aqueous dispersion of the inorganic pigment.
- 2. The copolymer of claim 1 wherein the ethylenically unsaturated organic phosphate is a compound of the formula I
- 3. The copolymer of claim 2 wherein the compound of formula 1 is selected from the group consisting of phosphoxyhexa(oxypropylene) mono-, di- and tri-methacrylate, phosphoxydodeca(oxypropylene) mono-, di- and tri-methacrylate, phosphoxyhexa(oxyethylene) mono-, di- and tri-methacrylate, phosphoxydodeca(oxyethylene) mono-, di- and tri-methacrylate, phosphoxyhexa(oxypropylene) mono-, di- and tri-acrylate, phosphoxydodeca(oxypropylene) mono-, di- and tri-acrylate, phosphoxyhexa(oxyethylene) mono-, di- and tri-acrylate and, phosphoxydodeca(oxyethylene) mono-, di- and tri-acrylate.
- 4. The copolymer of claim 1 further comprising a hydrophobic monomer.
- 5. The copolymer of claim 4 wherein the hydrophobic monomer is 2-phenoxyethylacrylate or a monovinyl aromatic hydrocarbon having from 8 to 12 carbon atoms and halogenated derivatives thereof having halo-substituted aromatic moieties.
- 6. The copolymer of claim 5 wherein the hydrophobic monomer is selected from the group consisting of styrene, alpha-methylstyrene, vinyl toluene, meta-methylstyrene, para-methylstyrene, para-ethylstyrene, para-n-propylstyrene, para-isopropylstyrene, para-tert-butylstyrene, ortho-chlorostyrene, para-chlorostyrene, alpha-methyl-meta-methylstyrene, alpha-methyl-para-methylstyrene, tert-butyl styrene, alpha-methyl-ortho-chlorostyrene, and alpha-methyl-para-chlorostyrene.
- 7. The copolymer of claim 1 wherein the ethylenically unsaturated organic phosphonate is a compound of the formula II
- 8. The copolymer of claim 1 wherein the ethylenically unsaturated organic phosphate is phosphated hydroxyethyl acrylate.
- 9. The copolymer of claim 1 wherein the ethylenically unsaturated carboxylated monomer is methacrylic acid.
- 10. The copolymer of claim 1 wherein the ethylenically unsaturated organic phosphate is phosphated hydroxyethyl methacrylate.
- 11. The copolymer of claim 1 wherein the ethylenically unsaturated carboxylated monomer is vinyl phosphonic acid.
- 12. A water soluble copolymer useful as an inorganic pigment dispersant comprised of a polymerized phosphated hydroxyethyl acrylate and methacyrlic acid.
- 13. The copolymer of claim 1 wherein the amount of the ethylenically unsaturated organic phosphate or phosphonate is from about 1% to about 60% by weight of the copolymer.
- 14. The copolymer of claim 1 wherein the amount of the ethylenically unsaturated organic phosphate or phosphonate is from about 10% to about 50% by weight of the copolymer.
- 15. The copolymer of claim 1 wherein the amount of the ethylenically unsaturated carboxylated monomer is from about 10% to about 50% by weight of the copolymer.
- 16. The copolymer of claim 1 wherein the amount of the ethylenically unsaturated carboxylated monomer is from about 40% to about 99% by weight of the copolymer.
- 17. The copolymer of claim 1 wherein the amount of the ethylenically unsaturated carboxylated monomer is from about 50% to about 90% by weight of the copolymer.
- 18. The copolymer of claim 1 further comprising a hydrophobic monomer which is an ethylenically unsaturated aromatic compound.
- 19. The copolymer of claim 18 wherein the hydrophobic monomer is selected from the group consisting of styrene, alpha-methylstyrene, vinyl toluene, meta-methylstyrene, para-methylstyrene, para-ethylstyrene, para-n-propylstyrene, para-isopropylstyrene, para-tert-butylstyrene, ortho-chlorostyrene, para-chlorostyrene, alpha-methyl-meta-methylstyrene, alpha-methyl-para-methylstyrene, tert-butyl styrene, alpha-methyl-ortho-chlorostyrene, and alpha-methyl-para-chlorostyrene.
- 20. The copolymer of claim 1 further comprising a multi-ethylenically unsaturated monomer.
- 21. The copolymer of claim 20 wherein the multi-ethylenically unsaturated monomer is selected from the group consisting of allyl methacrylate, divinyl benzene, ethylene glycol di-allyl ether, pentaerythritol di-allyl ether, methylene-bis-acrylamide, trimethylene-bis-acrylamide, hexamethylene-bis-acrylamide, N,N′diacryloylpiperazine, m-phenylene-bis-acrylamide, and p-phenylene-bisacrylamide), diethylene glycol diacrylate, propylene glycol dimethacrylate, ethylene glycol dimethacrylate, polyethylene glycol diacrylate, bis(4-acryloxypolyethoxyphenyl)-propane, 1,3-butylene glycol dimethacrylate, 1,5-pentanediol diacrylate, neopentyl glycol diacrylate, 1,6-hexanediol diacrylate, polypropylene glycol diacrylate, pentaerythritol triacrylate, trimethylolpropane triacrylate, trimethylolpropane trimethacrylate, pentaerythritol tetraacrylate, and triethylene glycol trimethacrylate.
- 22. The copolymer of claim 1 wherein the ethylenically unsaturated organic phosphate is phosphated hydroxyethyl acrylate.
- 23. The copolymer of claim 1 wherein the ethylenically unsaturated carboxylated monomer is methacrylic acid.
- 24. The copolymer of claim 1 wherein the ethylenically unsaturated organic phosphonate is vinyl phosphonic acid.
- 25. A method of preparing an inorganic pigment dispersion comprising dispersing an inorganic pigment in an aqueous medium comprising the copolymer of claim 1.
- 26. The method of claim 25 wherein the pigment is zinc dioxide.
- 27. The method of claim 26 wherein the zinc dioxide is dispersed as a 70% aqueous slurry.
- 28. The method of claim 26 wherein the aqueous medium is comprised of titanium dioxide.
- 29. A method of preparing an zinc dioxide dispersion which also contains titanium dioxide comprising adding a 70% aqueous zinc oxide dispersion to an aqueous medium comprised of titanium dioxide and a copolymer of claim 1.
- 30. An aqueous dispersion comprising a pigment and a copolymer of claim 1.
- 31. The dispersion of claim 30 wherein the pigment is ZnO, TiO2, calcium carbonate, barium sulfate, and zinc phosphate.
- 32. A latex paint comprising an inorganic pigment in an aqueous medium comprising the copolymer of claim 1.
- 33. A method of coating a substrate comprising contacting a substrate with a composition comprising a latex paint, a pigment and a copolymer of claim 1 and drying the coated surface to form a film.
- 34. A composition comprising a substrate, a latex paint, a pigment and a copolymer of claim 1.
CROSS-REFERENCE TO RELATED APPLICATIONS
[0001] This application claims the benefit of copending provisional application serial No. 60/339,893, filed on Oct. 31, 2001, the entire contents of which are incorporated herein by reference.
Provisional Applications (1)
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Number |
Date |
Country |
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60339893 |
Oct 2001 |
US |