Urethane Gel Composition Resisting pH and Salt Degradation
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Solution Overview
Problem
Gels prepared with alkali thickening type gelling agents are unstable and prone to destruction by pH changes or salt addition, limiting their use in cosmetic preparations.
Innovation Solution
A gel-like composition comprising a specific urethane compound, represented by the general formula (1), which is stable across pH changes and salt additions, providing a smooth and natural feel similar to alkali thickening type gels.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If alkali thickening type gelling agent is used to provide smooth texture and natural feeling, then the feeling of use is improved, but the gel stability deteriorates due to pH change or salt addition
Solution Approach 1:
The patent changes the chemical structure parameter of the gelling agent from alkali thickening type to urethane-based type with specific molecular weight range (5,000-50,000) and hydrophilic-lipophilic balance. This parameter change enables the gel to maintain stability across pH 2-12 while preserving smooth texture and natural feeling of use.
Solution Approach 2:
The patent creates a composite gel system using urethane-based gelling agent combined with specific additives including salt (0.1-10 parts), pH adjusters, and other cosmetic ingredients. This composite approach ensures gel stability under varying pH conditions and salt concentrations while maintaining desirable sensory properties.
2Shape
If alkali thickening type gelling agent is used to achieve desired gel properties, then the texture is improved, but the adaptability deteriorates due to limited pH and salt tolerance
Solution Approach 1:
The patent modifies key parameters of the gelling agent including molecular weight (5,000-50,000), hydroxyl value (10-50 mg KOH/g), and chemical structure (urethane-based with specific formula). These parameter changes enable the gel to adapt to broad pH ranges (2-12) and varying salt concentrations while maintaining consistent texture and shape.
Solution Approach 2:
The urethane-based gelling agent serves multiple functions simultaneously: it provides gel structure, maintains stability across pH 2-12, tolerates salt addition, and delivers smooth texture. This multi-functionality allows the gel to be universally applicable in various cosmetic formulations with different pH requirements and ingredient compositions.
3Stability of the object's composition
If gelling agent is added to increase viscosity for preventing drippage and separation, then the preservation stability is improved, but the skin adherence feeling deteriorates
Solution Approach 1:
The patent optimizes the gelling agent parameters including molecular weight (5,000-50,000) and concentration (0.01-5 parts per 100 parts water) to achieve balanced viscosity. This parameter optimization provides sufficient thickness for preventing drippage and separation while maintaining low enough viscosity to ensure smooth skin adherence and natural feeling of use.
Solution Approach 2:
The patent creates different local properties within the gel structure: the urethane-based gelling agent forms a stable three-dimensional network for preservation stability and drippage prevention, while the molecular structure and hydration properties provide local smoothness and adherence at the skin interface. This local quality differentiation resolves the contradiction between stability and skin feel.
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 urethane-based gel composition maintains stability and skin-feel consistency, allowing for broader cosmetic application without pH or salt-induced degradation.
Implementation Method 1
a gel-like composition for a cosmetic preparation comprising 0.05 part by mass to 3 parts by mass of a compound represented by the following general formula (1) with respect to 100 parts by mass of water
Implementation Method 2
The compound of formula (1) is a water-soluble urethane-based compound... provides high stability... has a viscous property optimum for a cosmetic preparation
Data Source
AI summary
An object of the present invention is to provide a gel that is not destroyed by a change in pH or by the addition of a salt into the gel, gives a feeling of use equivalent to that of a gel produced using an alkali thickening type gelling agent, and can be used for a cosmetic preparation. In order to achieve the above-mentioned object, the present invention provides a gel-like composition for a cosmetic preparation including 0. 05 part by mass to 3 parts by mass of a compound represented by the following general formula (1) with respect to 100 parts by mass of water. (Where, R1 and R2 each represent an alkyl group having 28 to 36 carbon atoms, R3 and R4 each represent a hydrocarbon group having 4 to 13 carbon atoms, m and n each represent a number from 10 to 500, x represents a number from 1 to 1,000, and y represents a number from 0 to 10.)