Oral Care Capsule Coating for Brushing Duration Indication
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing oral care compositions lack an effective way to indicate to users that they have brushed their teeth for the recommended duration, as current color-changing toothpaste compositions do not reliably provide a visual cue after toothbrushing.
Innovation Solution
An oral care composition comprising capsules with a core containing a pigment, a shear-thinning structurant, and a coating of wax with a melting point above 70°C, along with an opacifier and oil, which breaks down during brushing to release the pigment, providing a visual indication of the brushing time.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a wax coating with low melting point is used, then the capsule breaks down easily during brushing to release pigment, but the capsule may break too early before brushing is complete, failing to provide accurate timing indication
Solution Approach 1:
The patent changes the melting point parameter of the wax from conventional low melting point waxes to high melting point waxes (above 70°C, preferably above 80°C). This parameter change ensures the coating remains intact during normal brushing while still breaking down at the end of the recommended brushing time, providing reliable timing indication without premature breakdown.
Solution Approach 2:
The patent uses composite material composition in the coating, combining high melting point wax with specific oils (animal, vegetable, or mineral sources) and opacifiers. This composite approach optimizes both the structural integrity during brushing and the controlled breakdown characteristics, resolving the contradiction between maintaining capsule integrity and enabling timely release.
2Loss of information
If pigment is released immediately upon capsule application, then users get immediate color indication, but the color change occurs before the recommended brushing time is reached
Solution Approach 1:
The patent applies preliminary action by pre-formulating the capsule with a high melting point wax coating that is designed to remain stable throughout the entire recommended brushing duration. The coating is prepared in advance with specific wax-to-oil ratios (20:80 to 80:20) to ensure it maintains integrity during brushing and only breaks down after the full two minutes have elapsed, providing accurate timing information.
Solution Approach 2:
The patent utilizes phase transition of the high melting point wax (solid at room temperature and during brushing, melting at elevated temperatures) as the mechanism for controlled pigment release. The wax remains solid during normal brushing conditions, preventing premature release, and transitions to liquid phase only under the sustained heat and mechanical action of proper brushing duration, enabling accurate timing indication.
3Productivity
If the capsule coating is made thin for easy breakdown, then pigment release is faster, but the capsule structure becomes weak and may break during handling or storage
Solution Approach 1:
The patent changes the physical and chemical parameters of the coating materials, specifically using high melting point waxes with optimized molecular weight and composition. This allows the coating to maintain sufficient thickness for structural strength while still enabling controlled breakdown at the appropriate time. The wax-to-oil ratio parameter is optimized to balance strength and release characteristics.
Solution Approach 2:
The patent applies dynamics by designing a coating that adapts its properties during use: it maintains high strength and integrity during storage and handling, then transitions to controlled breakdown during brushing. The dynamic response is triggered by the combined effects of mechanical shear force and thermal energy from prolonged brushing, allowing the coating to switch from a protective state to a release state at the appropriate time.
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 composition effectively contains the pigment until toothbrushing, ensuring a controlled release after the desired time, providing a clear visual cue to users that they have brushed for the recommended duration without compromising capsule integrity.
Implementation Method 1
the core comprising an oil, a pigment and a shear-thinning structurant
Implementation Method 2
the coating comprising a wax having a melting point of at least 70 degrees C
Data Source
AI summary
An oral care composition comprising from 0.01 to 50% by weight of the composition of a capsule, the capsule comprising a core and a coating for the core, the coating comprising a wax having a melting point of at least 70 degrees C, an oil and an opacifier and the core comprising an oil, a pigment and a shear-thinning structurant.