Continuous silica production process and silica product prepared from same
AssigneeJ. M. Huber Corporation
InventorsWilliam J. Hagar, Karl W. Gallis
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Abstract
Disclosed herein is a continuous process for preparing a silica product, comprising: (a) continuously feeding an acidulating agent and an alkali metal silicate into a loop reaction zone comprising a stream of liquid medium; wherein at least a portion of the acidulating agent and the alkali metal silicate react to form a silica product in the liquid medium of the loop reaction zone; (b) continuously recirculating the liquid medium through the loop reaction zone; and (c) continuously discharging from the loop reaction zone a portion of the liquid medium comprising the silica product. Silica products and dentifrice compositions comprising the silica products are also disclosed. A continuous loop reactor is also disclosed.
Claims20
Silica particles having a median particle size of from 3 to 15 μm, an oil absorption value of greater than 100 cc/100 g, a Pellicle Cleaning Ratio (PCR) value at 20% silica loading of at least 85, and a Perspex Abrasion Value of from 3.3 to 8.7.
A dentifrice composition comprising silica particles in an amount ranging from 5 to 35% by weight of the composition;
- wherein the silica particles have a median particle size of from 3 to 15 μm, an oil absorption value of greater than 100 cc/100 g, a Pellicle Cleaning Ratio (PCR) value at 20% silica loading of at least 85, and a Perspex Abrasion Value of from 3.3 to 8.7.
Silica particles having a median particle size of from 3 to 15 μm, an oil absorption value of greater than 100 cc/100 g, a Pellicle Cleaning Ratio (PCR) value at 20% silica loading of at least 85, a BET surface area of from 10 to 425 m2/g, and a Perspex Abrasion Value of from 3.3 to 8.7.
Dependencies are inferred from the claim text.