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Heat Treated Precipitated Silica

a technology of precipitated silica and heat treatment, which is applied in the direction of chemistry apparatus and processes, silicon oxides, and silicon compounds, can solve problems such as present compatibility problems with key formula actives, and achieve the effects of reducing plaque, sensitivity, and sensitivity

Inactive Publication Date: 2014-05-08
THE PROCTER & GAMBLE COMPANY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

The patent text describes a method for improving the stability of stannous ions by heat treatment of precipitated silica particles. The treatment reduces surface hydroxyls while maintaining the structure of the silica particles. This heat treatment is combined with the use of a stannous ion source to create a composition for reducing plaque, gingivitis, sensitivity, oral mal odor, erosion, cavities, calculus, inflammation, and staining in the oral cavity. The technical effects of this patent text are improved stability of stannous ions and reduced plaque, gingivitis, sensitivity, oral mal odor, erosion, cavities, calculus, inflammation, and staining in the oral cavity.

Problems solved by technology

While providing effective cleaning of teeth, precipitated silicas in oral compositions may present compatibility problems with key formula actives, such as stannous ions.
These compatibility problems have been shown to be directly related to surface properties of precipitated silicas such as surface area, number of hydroxyl groups, and porosity.

Method used

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Examples

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example i

Heat Treated Precipitated Silica

[0136]Samples of commercially available precipitated silica materials were heat treated for times and temperatures as shown below in Table 1.

TABLE 1Material% StannousZ-10961.0Z-109 - 2 hrs @ 600° C.85.0Z-11942Z-119 - 2 hrs @ 600° C.75.5Z-119 - 1 min @ 900° C.74.0

Z-109 and Z-119 are precipitated silicas commercially available from the Huber Corporation (USA). As may be seen in Table 1, treatment of a precipitated silica, Z-119, for about 1 minute at 900° improved the compatibility with stannous (the percentage of stannous ion available over time) at nearly the same level as by treating the same material for two hours at 600° C. The present invention therefore provides a similar benefit at a significant lower energy cost.

example ii

Heat Treated Precipitated Silica

[0137]Samples of commercially available precipitated silica materials were heat treated for times and temperatures as shown below in Table 2. NMR was then used to determine the level of Q2, Q3 and Q4 silanols with the readings normalized to Q4. Compatibility with stannous in a stannous-silica slurry was then measured by determining the amount of stannous ion available in the slurry after one week at 60° C. The results are tabulated below, also in Table 2.

TABLE 2Q4 NormalizedTemp.SnValues (%)*Q4 Normalized Integral Values**SilicaTime(° C.)(%)Q2Q3Q4Q2Q3Q4TotalZ-119NoneNone517.2862.5430.183948339031636254213Z-1192 hrs.2007.4557.934.653517273391636247218Z-1192 hrs.4006410.5253.3936.094768242041636245335Z-1192 hrs.600669.6743.1447.193352149581636234673Z-1192 hrs.800831.8537.5560.60499101371636226998Z-119NoneNone52Z-1192 min.80064.213.8944.741.415489176661636239517Z-1192 min.90075.513.3150.0336.675938223241636244624Z-1192 min.1000 80-9013.3646.8839.77549519...

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Abstract

Process for heat treating precipitated silica to improve stability. Oral care compositions comprising such heat treated precipitated silica abrasives and a stannous ion source.

Description

FIELD OF THE INVENTION[0001]The present invention relates to processes for heat treatment of precipitated silica particles and to oral care compositions comprising such treated precipitated silica particles.BACKGROUND OF THE INVENTION[0002]An effective oral composition can maintain and preserve tooth appearance by removing dental stains and polishing the teeth. It may clean and remove external debris as well, which can aid the prevention of tooth decay and promote gingival health.[0003]Abrasives in oral compositions aid in the removal of the tightly adherent pellicle film to which dental stains affix. Pellicle film usually comprises a thin acellular, glycoprotein-mucoprotein coating, which adheres to the enamel within minutes after teeth are cleaned. The presence of various food pigments lodged within the film accounts for most instances of teeth discoloration. An abrasive may remove the pellicle film with minimal abrasive damage to oral tissue, such as the dentin and enamel.[0004]I...

Claims

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Application Information

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Patent Type & Authority Applications(United States)
IPC IPC(8): A61K8/25A61K8/55A61Q11/00C01B33/12
CPCA61K8/25C01B33/126A61Q11/00A61K8/55A61K8/0241A61K8/044A61K8/21A61K2800/28A61K2800/412A61K2800/592C01B33/18
Inventor DECKNER, GEORGE ENDELDOLAN, LAWRENCE EDWARD
Owner THE PROCTER & GAMBLE COMPANY
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