Non-staining Toothpaste Pigment System
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Solution Overview
Problem
Toothpaste formulations with dissolvable films or microcapsules that change color after brushing often stain toothbrush bristles, making it difficult to determine if brushing time is adequate without significant bristle discoloration.
Innovation Solution
A dentifrice formulation with a pigment system comprising Pigment Blue 15 and titanium dioxide, where the titanium dioxide level is between 0.05-0.2% by weight, combined with a copolymer of methyl vinyl ether and maleic anhydride, reduces bristle staining while providing a color signal upon adequate brushing time.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If dissolvable films or microcapsules comprising pigment are used to provide color change signal, then brushing time indication is improved, but toothbrush bristle staining increases
Solution Approach 1:
The patent introduces an intermediary substance (a specific polymer with carboxylic acid groups, such as polyacrylic acid or polyaspartic acid) that mediates between the pigment particles and the toothbrush bristles. This polymer adsorbs onto the bristle surface and prevents pigment deposition, effectively blocking the harmful interaction between the colored pigment and the bristles while allowing the pigment to still provide its color change indication function in the oral cavity
Solution Approach 2:
The patent changes the chemical parameters of the formulation by incorporating polymers with specific functional groups (carboxylic acid groups with pKa 3-6) at controlled concentrations (0.1-5% by weight). This parameter change modifies the surface chemistry to reduce pigment adhesion to bristles while maintaining the pigment's color change properties in the oral environment
2Measurement precision
If pigment level is increased to provide clear color signal, then brushing time indication is improved, but bristle staining increases
Solution Approach 1:
The polymer intermediary creates a protective barrier on the bristle surface that allows higher pigment concentrations to be used in the formulation without proportionally increasing bristle staining. The polymer adsorbs excess pigment and prevents it from binding to the bristles, decoupling the relationship between pigment concentration and staining level
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The optimized formulation effectively prevents significant staining of toothbrush bristles while providing a clear color change signal after brushing, ensuring users meet the recommended brushing time without bristle discoloration.
Implementation Method 1
Without being bound by theory, we hypothesize that this is driven by a charge (polarization) phenomena
Implementation Method 2
a dissolvable or disintegratable film comprising the one or more releasable pigments which are released during brushing
Implementation Method 3
a dissolvable or disintegratable film comprising the one or more releasable pigments which are released during brushing
Data Source
AI summary
The present invention relates to a dentifrice which does not excessively stain toothbrush bristles, for example, a pigmented toothpaste formulations having a pigment system which comprises (i) a dissolvable or disintegratable film comprising one or more releasable pigments which are released during brushing, and (ii) titanium dioxide, wherein the level of titanium dioxide is 0.01-0.375% by weight of the toothpaste; together with methods of making and using the same.