Process for the preparation of rutile titanium dioxide needles
Abstract
Abstract DISCLOSED IS A PROCESS WHICH INVOLVES TREATING A TITANIUM DIOXIDE COMPOSITION COMPRISING MONOCRYSTALLINE RUTILE NEEDLES HAVING AXIAL RATIOS OF GREATER THAN 20 AND DIAMETERS OF FROM 0.01 TO 0.20 MICRON IN ADMIXTURE WITH NONRUTILE TITANIUM DIOXIDE PARTICLES WITH A SOLUTION OF HYDROCHLORIC, NITRIC OR PERCHLORIC ACID AT A TEMPERATURE OF GREATER THAN 200*C. THE PROCESS PROVIDES AS A PRODUCT MONOCRYSTALLINE RUTILE TITANIUM DIOXIDE NEEDLES HAVING AXIAL RATIOS OF GREATER THAN 20 AND DIAMETERS WITHIN THE RANGE OF FROM 0.04 TO ABOUT 0.3 MICRON. THE PRODUCT OF THE PRESENT PROCESS IS AN EXCELLENT OPACIFIER FOR DISPERSE SYSTEMS AND IS SUPERIOR TO KNOWN TITANIUM DIOXIDE PRODUCTS AS A REINFORCEMENT MATERIAL FOR CERTAIN PLASTICS AND METALS.
Inventors
- 👤 Joseph P Surls
- 👤 David L Bauer
- 👤 Ben F West
Bibliographic Details
Claims Analysis
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