IP Library › Granted Patent US 8,609,068
Granted Patent B2
US 8,609,068 · App. 12/711,321 · Granted Dec 17, 2013

Continuous silica production process and silica product prepared from same

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Quick Facts
Patent No.
US 8,609,068
App. No.
12/711,321
Granted
Dec 17, 2013
Kind
B2
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.

Claims (13)

1. Silica particles having an oil absorption value of up to 100 cc/100 g; wherein at least 80% of the silica particles are rounded to well rounded; and wherein the silica particles have a sphericity (S 80 ) factor of greater than 0.9 and a Brass Einlehner Abrasion value of less than 8.0 mg lost/100,000 revolutions.

2. The silica particles of claim 1 , wherein the silica particles have a median particle size of from 3 to 15 μm.

3. The silica particles of claim 1 , wherein the silica particles have a median particle size of from 3 to 10 μm.

4. The silica particles of claim 1 , wherein the silica particles have an oil absorption value of from 30 to 80 cc/100 g.

5. The silica particles of claim 1 , wherein the silica particle have a BET surface area of from 50 to 350 m 2 /g.

6. A dentifrice composition comprising silica particles in an amount ranging from 5 to 50% by weight of the composition; wherein the silica particles have an oil absorption value of up to 100 cc/100 g, a sphericity (S 80 ) factor of greater than 0.9, and a Brass Einlehner Abrasion value of less than 8.0 mg lost/100,000 revolutions; wherein at least 80% of the silica particles are rounded to well rounded.

7. The dentifrice composition of claim 6 , wherein the composition comprises one or more of a humectant, a solvent, a binder, a therapeutic agent, a chelating agent, a thickener other than the silica particles, a surfactant, an abrasive other than the silica particles, a sweetening agent, a colorant, a flavoring agent, or a preservative.

8. The dentifrice composition of claim 6 , wherein the silica particles have a median particle size of from 3 to 15 μm.

9. The dentifrice composition of claim 6 , wherein the silica particles have a median particle size of from 3 to 10 μm.

10. The dentifrice composition of claim 6 , wherein the silica particles have an oil absorption value of from 30 to 80 cc/100 g.

11. The dentifrice composition of claim 6 , wherein the silica particles have a BET surface area of from 50 to 350 m 2 /g.

12. The dentifrice composition of claim 6 , wherein the composition has a Radioactive Dentin Abrasion (RDA) value of at least 100.

13. The dentifrice composition of claim 6 , wherein the composition has a Pellicle Cleaning Ratio (PCR) value of at least 85.

Assignments (6)
CHANGE OF NAME Recorded Dec 20, 2019
From: EVONIK DEGUSSA GMBH
To: EVONIK OPERATIONS GMBH
Reel/Frame 051382/0001 →
ASSIGNMENT OF ASSIGNOR'S INTEREST Recorded Oct 25, 2017
From: J.M. HUBER CORPORATION
To: EVONIK DEGUSSA GMBH
Reel/Frame 043944/0334 →
RELEASE OF SECURITY INTEREST IN PATENTS Recorded Jun 27, 2014
From: WELLS FARGO BANK, NATIONAL ASSOCIATION
To: J.M. HUBER CORPORATION; CP KELCO U.S., INC.; HUBER ENGINEERED WOODS LLC
Reel/Frame 033247/0705 →
SECURITY INTEREST Recorded Nov 8, 2011
From: J.M. HUBER CORPORATION; CP KELCO U.S., INC.; HUBER ENGINEERED WOODS LLC
To: WELLS FARGO BANK, NATIONAL ASSOCIATION, AS AGENT
Reel/Frame 027279/0114 →
RELEASE OF SECURITY INTEREST Recorded Nov 1, 2011
From: BANK OF AMERICA, N.A.
To: J.M. HUBER CORPORATION; 333 ASSOCIATES LLC; 333 PARTNERS LLC; CELTEGAN LLC; CP KELCO U.S., INC.; HUBER CST COMPANY; HUBER CST CORPORATION; HUBER ENERGY L.P.; HUBER ENERGY LLC; HUBER ENGINEERED WOODS LLC; HUBER EQUITY CORPORATION; HUBER INTERNATIONAL CORP.; HUBER RESOURCES CORP.; HUBER SOUTH TEXAS GP, LLC; HUBER SOUTH TEXAS LP, LLC; HUBER TIMBER INVESTMENTS LLC; HUBER TIMBER LLC; J.M. HUBER MICROPOWDERS INC.; JMH PARTNERS CORP.; KELCO COMPANY; ST. PAMPHILE TIMBER LLC; TABSUM, INC.; TARA INSURANCE GLOBAL LIMITED; QUINCY WAREHOUSES, INC. (FORMERLY UNDERGROUND WAREHOUSES, INC.
Reel/Frame 027158/0142 →
SECURITY AGREEMENT Recorded Mar 29, 2011
From: J.M. HUBER CORPORATION; 333 ASSOCIATES LLC; 333 PARTNERS LLC; CELTEGAN LLC; CP KELCO U.S., INC.; HUBER CST COMPANY; HUBER CST CORPORATION; HUBER ENERGY L.P.; HUBER ENERGY LLC; HUBER ENGINEERED WOODS LLC; HUBER EQUITY CORPORATION; HUBER INTERNATIONAL CORP.; HUBER RESOURCES CORP.; HUBER SOUTH TEXAS GP, LLC; HUBER SOUTH TEXAS LP, LLC; HUBER TIMBER INVESTMENTS LLC; HUBER TIMBER LLC; J.M. HUBER MICROPOWDERS INC.; JMH PARTNERS CORP.; KELCO COMPANY; ST. PAMPHILE TIMBER LLC; TABSUM, INC.; TARA INSURANCE GLOBAL LIMITED; UNDERGROUND WAREHOUSES, INC.
To: BANK OF AMERICA, N.A.
Reel/Frame 026042/0063 →