Ionically-Modified Crosslinked Silicone Gel for Personal Care
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Solution Overview
Problem
Silicone copolymer gels in personal care applications lack wash-off resistance, pigment dispersibility, and anti-whitening properties, and traditional methods for producing crosslinked siloxane polymers limit the incorporation of desirable organofunctional groups for enhanced performance.
Innovation Solution
A process for preparing a personal care composition with an ionically-modified cross-linked silicone network gel, formed by hydrosilylation of a hydride-functional silicone with an olefin in the presence of a precious metal catalyst and a solvent, containing an ionic radical moiety, which provides improved sensory benefits, wash-off resistance, and pigment dispersibility.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If traditional crosslinked siloxane polymer methods are used, then the polymer structure is formed, but the range of organofunctional groups that may be incorporated is limited
Solution Approach 1:
The patent changes the chemical parameters of the crosslinking reaction by using hydrosilylation chemistry with Si-H groups reacting with vinyl groups in the presence of a platinum catalyst. This parameter change enables the incorporation of diverse organofunctional groups including ionic radicals (carboxylates, sulfonates, phosphates) that were not accessible through traditional condensation methods, thus resolving the contradiction between versatility and ease of manufacture
2Ease of operation
If silicone copolymer gels are used in personal care applications, then silky feel is provided, but wash-off resistance is insufficient
Solution Approach 1:
The patent creates a composite material system by incorporating ionic radical moieties (such as carboxylate, sulfonate, or phosphate groups) into the crosslinked siloxane polymer structure. This composite approach combines the silky feel properties of silicone copolymers with the wash-off resistance provided by ionic interactions, resolving the contradiction between sensory comfort and performance reliability
3Adaptability or versatility
If conventional silicone gels are used, then formulation flexibility is maintained, but pigment dispersibility and anti-whitening properties are poor
Solution Approach 1:
The patent applies local quality by introducing specific ionic radical functional groups at localized positions within the polymer structure. These ionic groups create localized zones of enhanced polarity and interaction capability that specifically improve pigment wetting and dispersion without compromising the overall formulation flexibility of the silicone gel system
4Stability of the object's composition
If crosslinked silicone network gel is used, then structural stability is achieved, but syneresis resistance deteriorates over time
Solution Approach 1:
The patent introduces ionic radical moieties as intermediary functional groups within the crosslinked network that mediate between the hydrophobic siloxane backbone and hydrophilic components. These ionic intermediaries prevent phase separation and syneresis by maintaining balanced interactions throughout the gel structure, thus preserving both structural stability and long-term syneresis resistance
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 ionically-modified cross-linked silicone network gel offers a silky feel, enhanced wash-off resistance, and improved pigment dispersibility, while maintaining stability and resistance to syneresis, even with prolonged aging.
Implementation Method 1
cross-polymers formed by the hydrosilylation of a hydride-functional silicone containing at least two Si-H groups with an olefin containing at least two Si-olefinic groups, in the presence of a precious metal catalyst
Implementation Method 2
in the presence of a precious metal catalyst suitable for facilitating addition cure reaction between (a) and (b)
Data Source
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AI summary
The invention is directed to a personal care composition which contains an ionically-modified cross-linked silicone network which is formed by the polymerization of a silicone polymer containing hydrosilylation effective unsaturated moiety, silyl hydride moiety and ionic radicals.