PRECIPITATED SILICAS HAVING IMPROVED DENTIFRICE PERFORMANCE CHARACTERISTICS AND METHODS OF PREPARATION

• Main Authors: PATRICK D. MCGILL, SATISH K. WASON
• Format: Patent
• Language: English
• Published: 31.07.2004
• Subjects: CHEMISTRY; COMPOUNDS THEREOF; HUMAN NECESSITIES; HYGIENE; INORGANIC CHEMISTRY; MEDICAL OR VETERINARY SCIENCE; METALLURGY; NON-METALLIC ELEMENTS; PREPARATIONS FOR MEDICAL, DENTAL, OR TOILET PURPOSES; SPECIFIC USE OF COSMETICS OR SIMILAR TOILETPREPARATIONS

PRECIPITATED SILICA COMPOSITIONS, AND METHODS FOR MAKING THE SAME, WITH IMPROVED DENTIFRICE PERFORMANCE CHARACTERISTICS. IN PARTICULAR, PRECIPITATED SILICA COMPOSITIONS OF THE PRESENT INVENTION HAVE A 40LURRY VISCOSITY BUILD OF LESS THAN APPROXIMATELY 20,000 CENTIPOISE AND A 10BRASS EINLEHNER ABRASION VALUE OF APPROXIMATELY 2.5 TO 20.0 MG LOSS/100,000 REV. PRECIPITATED SILICA COMPOSITIONS OF THE PRESENT INVENTION ALSO HAVE REACTOR SLURRY AVERAGE PARTICLE SIZES (50) OF APPROXIMATELY 10 TO 50 µm. METHODS FOR PREPARING PRECIPITATED SILICAS OF THE PRESENT INVENTION INCLUDE THE STEPS OF: (A) ADDING SODIUM SILICATE AND A MINERAL ACID TO A REACTOR, THEREBY INIATIATING A PRECIPITATION REACTION BETWEEN THE REACTOR CONTENTS; AND (B) SUBJECTING THE REACTOR CONTENTS TO SHEARING FORCES AS THE REACTION PROCEEDS.