J.m. Huber Corporation

Other

Patrick D McGill

William C Fultz

Michel J Martin

Satish K Wason

Yung-Hui Huang

Minas R Apelian

Donald M Gury

William W Fultz

John A Kostinko

Karl William Gallis

Sung-Tsuen Liu

William Jackson Hagar

Treated silica materials are disclosed, together with methods of making such materials and dentifrice compositions comprising the treated silica materials.

Treated silicas and metal silicates for improved cleaning in dentifrice

Unique abrasive and/or thickening materials that are in situ generated compositions of precipitated silicas and silica gels are provided. Such compositions exhibit different beneficial characteristics depending on the structure of the composite in situ generated material. With low structured composites (as measured via linseed oil absorption levels from 40 to 100 ml oil absorbed/100 g composite), simultaneously high pellicle film cleaning properties and moderate dentin abrasion levels are possible in order to accord the user a dentifrice that effectively cleans tooth surfaces without detrimentally abrading such surfaces. Increased amounts of high structure composite materials tend to accord greater viscosity build and thickening benefits together with such desirable abrasion and cleaning properties, albeit to a lesser extent than for the low structure types. Thus, mid-range cleaning materials will exhibit oil absorption levels from an excess of 100 to 150, and high thickening/low abrasion composite exhibit oil absorption properties in excess of 150. Such an in situ, simultaneously produced precipitated silica/silica gel combination provides such unexpectedly effective low abrasion and high cleaning capability and different thickening characteristics as compared to physical mixtures of such components. Encompassed within this invention is a unique method for making such gel/precipitated silica composite materials for such a purpose, as well as the different materials within the structure ranges described above and dentifrices comprising such.

High-cleaning silica materials and dentifrice containing such

High-cleaning/moderate abrasive silica materials and dentifrice containing such materials

Viscosity-modifying silica materials that exhibit low cleaning and abrasive levels and dentifrices thereof

Unique abrasive materials that are in situ generated compositions of precipitated silicas and silica gels are provided. Such compositions exhibit different beneficial, particularly simultaneously high pellicle film cleaning properties and moderate dentin abrasion levels. Such a result thus accords the user a dentifrice that effectively cleans tooth surfaces without detrimentally abrading such surfaces. Furthermore, the produced abrasive materials also exhibit very high and desirable brightness properties that permit easy incorporation and utilization within dentifrices for aesthetic purposes. Encompassed within this invention is a unique method for making such gel/precipitated silica composite materials for such a purpose, particularly under high shear conditions, as well as the different materials within the structure ranges described above and dentifrices comprising such.

High-cleaning, low abrasion, high brightness silica materials for dentrifices

High-cleaning/low abrasive silica and materials and dentifrice containing such materials

An abrasive precipitated calcium carbonate is provided that provides excellent cleaning properties without being excessively abrasive or damaging to gums or tooth surfaces. The abrasive, precipitated calcium carbonate has a primary particle size of about 1 &#x3bc;m to about 4 &#x3bc;m, and an aggregate size of about 3 &#x3bc;m to about 10 &#x3bc;m. Also disclosed is a method for forming calcium carbonate comprising the steps of: providing a reaction medium; introducing carbon dioxide and the calcium hydroxide slurry simultaneously into a reaction medium to form calcium carbonate while maintaining constant pH during calcium carbonate precipitation; and optionally drying the calcium carbonate slurry to form a dried calcium carbonate product. Also disclosed is a dentifrice containing the aforementioned abrasive, precipitated calcium, and one or more ingredients selected from the group consisting of humectants, thickening agents, binders, gums, stabilizing agents, antibacterial agents, fluorides, sweeteners, and surfactants.

Precipitated calcium carbonate

A transparent dentifrice is provided that has excellent abrasive performance. The dentifrice comprises from about 10 wt % to about 13 wt % water, and an abrasive, low-structure, precipitated silica having: a refractive index of from about 1.439 to 1.450, an oil absorption of from about 90 ml/100 g to about 120 ml/100 g, a light transmittance of greater than about 60%; and a Brass Einlehner abrasion value of less than about 5 mg loss/100,000 rev. Additionally the dentifrice has: a haze value of less than about 50; an RDA of about 50 to 200; and a refractive index of from about 1.439 to 1.450.

Abrasive compositions for clear toothpaste

Method of making abrasive compositions comprised of water-insoluble abrasive polishing agents suspended in an aqueous medium in combination using wet grinding, and products thereof. The abrasive compositions made by the method contain appropriately sized abrasive particles provided without the need for drying or dry milling, while also providing an abrasive composition which is theologically stable, settling-resistant, and re-agglomeration resistant, even during and after transport and/or storage before end-use, such as incorporation into dentifrice formulations or other oral cleaning compositions.

Method for making abrasive compositions and products thereof

Abrasive compositions comprised of water-insoluble abrasive polishing agents suspended in a liquid medium in combination with humectant, and methods for making same. The inventive abrasive compositions are rheologically stable, settling-resistant, and re-agglomeration resistant, even during and after transport and/or storage before end-use, such as incorporation into dentifrice formulations or other oral cleaning compositions. The high settling-resistance of the inventive abrasive composition makes it possible to avoid the need before end use for temporary stabilizers such as inorganic suspending agents (e.g., clays, fumed silicas) or organic binders (e.g., polysaccharides). Also, the abrasive compositions contain abrasive particles having improved brightness as compared to abrasive particles made via drying and dry comminution processing.

Abrasive compositions and methods for making same

Methods of making dentifrice compositions including, as a raw material ingredient thereof, abrasive compositions comprised of water-insoluble abrasive polishing agents suspended in a liquid medium in combination with humectant, and the unique dentifrice compositions made in this manner.

Methods of making dentifrice compositions and products thereof

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 40% slurry viscosity build of less than approximately 20,000 centipoise and a 10% Brass 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 .mu.m. 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 initiating a precipitation reaction between the reactor contents; and (b) subjecting the reactor contents to shearing forces as the reaction proceeds.

Precipitated silicas having improved dentifrice performance

A precipitated silica composition which, when incorporated into a suitable dentifrice composition, the dentifrice composition exhibits an mPCR of about 103 to 124 and an RDA of about 88 to 102. The invention also provides a precipitated silica composition which, when incorporated into a suitable dentifrice composition, the dentifrice composition exhibits an mPCR to RDA ratio of greater than about 1.1.

Precipitated silicas having wet cake moisture values in excess of 85%, BET surface areas of 600-700 m.sup.2 /g, oil absorption values of 50 to 60 cc/100 g, total intruded volume of about 1.2 to 0.8 cc/g, and a median pore radius of 50 .ANG. to 20 .ANG. are produced by a low temperature silica precipitation process. The silicas have unique flatting characteristics and are additionally useful as conditioning agents for food and salt and in dentifrice compositions.

Microporous high structure precipitated silicas and methods

Precipitated silica gels having high surface areas and low oil absorption values are produced by a low temperature synthesis precipitation process. The precipitated silicas have unique flatting characteristics and are additionally useful as conditioning agents for food and salt and in dentifrice formulations.

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Havre de Grace, MD, United States of America

Patrick D McGill