Amorphous silica

An amorphous silica suitable for use in a dental composition has a weight mean particle size in the range 3 to 15 m with at least 90 per cent by weight of particles having a size below 20 m, a Radioactive Dentine Abrasion (RDA) determined on an aqueous slurry of the silica powder of 100 to 220, a Pe...

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Bibliographic Details
Main Authors STANIER, PETER WILLIAM, STEBBING, SIMON RICHARD
Format Patent
LanguageChinese
English
Published 01.10.2003
Subjects
CHEMISTRY
COMPOUNDS THEREOF
HUMAN NECESSITIES
HYGIENE
INORGANIC CHEMISTRY
MEDICAL OR VETERINARY SCIENCE
METALLURGY
NON-METALLIC ELEMENTS
PREPARATIONS FOR MEDICAL, DENTAL, OR TOILET PURPOSES
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Summary:An amorphous silica suitable for use in a dental composition has a weight mean particle size in the range 3 to 15 m with at least 90 per cent by weight of particles having a size below 20 m, a Radioactive Dentine Abrasion (RDA) determined on an aqueous slurry of the silica powder of 100 to 220, a Pellicle Cleaning Ratio (PCR), when incorporated in a dental composition at 10 per cent by weight, greater than 85, the ratio of PCR to RDA being in the range 0.4: 1 to less than 1 : 1 and having a Plastics Abrasion Value (PAV) in the range 11 to 19. A silica having the above properties is prepared by a precipitation route. The silica made available by the invention is also useful as an anti blocking agent in plastics.
Bibliography:Application Number: TW200291136826