Process for the production of aqueous dispersions of pigmentary titanium dioxide
Patent 4448609 Issued on May 15, 1984. Estimated Expiration Date: 
March 25, 2002. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.
March 25, 2002. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.Patent References 3172772 3567479 3653936 3702773 Pigments Patent #: 3942999 InventorsAssigneeApplicationNo. 06/361888 filed on 03/25/1982US Classes:106/443, Phosphorus containing106/442, Aluminum compound or silicon containing106/444, Alkali or alkaline earth metal containing106/445, Organic material containing106/446, Silicon containing516/90The metal present in the greatest amount is titanium, zirconium, or hafniumExaminersPrimary: Higel, Floyd D.Attorney, Agent or FirmInternational ClassesC09D 17/00 (20060101)C09D 7/02 (20060101) Foreign Application Priority Data1981-04-10 GBAbstractStable high concentration aqueous slurries of pigmentary metal oxide particles having a hydrous oxide surface-treatment comprising alumina, for example alumina surface-treated pigmentary titanium dioxide, may be formed by the use of a specified combination of anionic and amine dispersants and a milling in the presence of grinding elements, for example in a sand mill, to develop suitable viscosity and gloss characteristics. The slurries may show thixotropic properties and are suitable for incorporation in vinyl silk aqueous emulsion paints. | |
