Zinc-Silicate Core-Shell Silica Particles for Malodor Control
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Solution Overview
Problem
Existing oral care compositions require multiple active agents for multifunctionality, such as antibacterial and malodor control, which can lead to regulatory burdens and user dissatisfaction, and silica particles lack effective multifunctionality beyond abrasion and thickening.
Innovation Solution
Development of core-shell silica particles with a silica core etched by a metal silicate, particularly using NaOH to form Na2SiO3 and reacting with zinc ions, reducing soluble zinc ions to improve taste and provide antibacterial and malodor control.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If multiple active agents are added to provide multifunctionality, then the functional effects are improved, but the regulatory burden and formulation complexity increase
Solution Approach 1:
The patent applies multi-functionality by enabling silica particles to perform multiple functions simultaneously - abrasive action, thickening, and antibacterial/malodor control through the metal silicate shell. This eliminates the need for separate active agents and reduces formulation complexity while maintaining multifunctionality.
Solution Approach 2:
The patent merges the functions of multiple active agents into a single core-shell silica particle structure. The silica core provides abrasive and thickening functions, while the metal silicate shell provides antibacterial and malodor control functions, combining what would traditionally require separate ingredients into one integrated component.
2Adaptability or versatility
If multiple active agents are added to provide multifunctionality, then the functional effects are improved, but the regulatory burden increases
Solution Approach 1:
By making silica particles multifunctional through the metal silicate shell, the patent reduces the number of separate active agents needed, thereby reducing regulatory burden while maintaining antibacterial, malodor control, abrasive, and thickening functions in a single compliant ingredient.
Solution Approach 2:
The core-shell structure creates a composite material where silica and metal silicate work together to provide multiple functions. This composite approach allows a single ingredient to replace multiple active agents, simplifying regulatory compliance while maintaining multifunctionality.
3Reliability
If soluble zinc compounds are used for antibacterial effect, then the antibacterial efficacy is improved, but the astringent taste increases
Solution Approach 1:
The patent applies local quality by concentrating zinc in the metal silicate shell rather than using soluble zinc compounds throughout the formulation. This localized zinc delivery provides antibacterial efficacy at the particle surface while minimizing the astringent taste associated with soluble zinc ions in the bulk formulation.
Solution Approach 2:
The patent changes the physical and chemical parameters of zinc delivery by using insoluble metal silicate shell structures instead of soluble zinc compounds. This parameter change maintains antibacterial efficacy through contact with oral microbes while reducing the concentration of soluble zinc ions that cause astringent taste.
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 core-shell silica particles offer improved taste profiles and effective antibacterial and malodor control in oral care compositions by minimizing the use of additional agents, reducing regulatory risks and user dissatisfaction.
Implementation Method 1
a surface of the silica core etched with a metal silicate
Implementation Method 2
the core shell silica particles offer improved taste profiles and effective antibacterial and malodor control
Data Source
AI summary
The present invention relates to core shell silica particles, wherein each core shell silica particle comprises a silica core, and a surface of the silica core is etched with metal silicate, the core shell silica particles prepared by: i) admixing an amount of silica particles in water with an amount of a base, wherein the base comprises a monovalent metal ion, to produce core shell silica particles, each core shell silica particle comprising a silica core, and a surface of the silica core etched with a silicate of the monovalent metal ion; and ii) reacting the core shell silica particles formed in step i) with a metal salt comprising a second metal ion, to form core shell silica particles comprising silicate of the second metal ion on the surface of the silica core.