Tin Ion Oral Care Composition High pH Stability
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Solution Overview
Problem
The incorporation of tin ion sources into dentifrice compositions is challenging due to reactivity with other components and the formation of insoluble tin compounds at high pH conditions, which reduces tin ion availability for oral cavity surfaces.
Innovation Solution
An oral care composition comprising a tin ion source and a polyol with five or more carbon atoms, such as xylitol or sorbitol, at a pH of greater than 7, which prevents the formation of insoluble tin compounds and maintains tin ion availability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the pH of the dentifrice composition is increased to provide antisensitivity benefits, then oral care performance is improved, but tin ion availability decreases due to formation of insoluble Sn(OH)2
Solution Approach 1:
A water-soluble chelating agent is introduced as an intermediary substance that binds to tin ions to form soluble complexes, preventing the formation of insoluble Sn(OH)2 at high pH while allowing tin ions to remain available for interaction with oral cavity surfaces
Solution Approach 2:
The chemical state of tin ions is changed by forming chelate complexes, which alters the solubility characteristics and allows tin to remain in solution at high pH conditions where it would normally precipitate as Sn(OH)2
2Stability of the object's composition
If chelating agents are added to maintain tin ion availability at high pH, then tin ion stability is improved, but cost and formulation complexity increase
Solution Approach 1:
Common, inexpensive chelating agents such as EDTA, citric acid, or gluconate are used instead of expensive specialized chelators, making the formulation more cost-effective and simpler to manufacture while achieving the desired tin ion stabilization
3Reliability
If stannous fluoride is used as a tin ion source, then antimicrobial and antisensitivity benefits are provided, but reactivity with other dentifrice components increases
Solution Approach 1:
The chelating agent is included in the formulation to preemptively bind to tin ions and protect them from unwanted reactions with other dentifrice components such as silica abrasives, while still allowing the tin-chelate complex to deliver antimicrobial and antisensitivity benefits to oral cavity surfaces
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 is shelf-stable with minimal formation of Sn(OH)2, ensuring effective delivery of tin ions to oral cavity surfaces, thereby providing antimicrobial and antisensitivity benefits.
Implementation Method 1
The chemical instability in solution of tin ions can be mitigated by lowering the pH of the solution, providing anionic chelants, such as anions of organic acids, or providing polymeric chelants, such as polyphosphates or polycarboxylates
Implementation Method 2
An oral care composition comprising a tin ion source and a polyol with five or more carbon atoms, such as xylitol or sorbitol, at a pH of greater than 7, which prevents the formation of insoluble tin compounds and maintains tin ion availability
Data Source
AI summary
A dentifrice composition includes tin, from about 5% to about 50%, by weight of the dentifrice composition, of polyol, and up to about 45%, by weight of the composition, of water. The polyol includes xylitol, sorbitol, or combinations thereof. The dentifrice composition has a pH of greater than 7.