Ionic Liquid Solubilizing UV Absorbers in Cosmetic Oils
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Solution Overview
Problem
Existing compositions of organic active ingredients, ionic liquids, and oils face challenges such as complex preparation, limited solubility of active ingredients, toxicity, and chemical degradation, which hinder high concentration solutions and effective use in applications like cosmetics.
Innovation Solution
A liquid composition comprising sparingly water- and oil-soluble UV absorbers, specifically hydroxyphenyltriazine compounds, combined with an aromatic hydrocarbon oil and an ionic liquid with specific cation and anion structures, enhancing solubility and stability, and allowing for high concentrations of active ingredients.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If conventional ionic liquids are used to increase solubility of active ingredients, then solubility is improved, but the preparation complexity increases and toxicity increases
Solution Approach 1:
The patent applies parameter changes by modifying the chemical structure of ionic liquids, specifically using ammonium cations with simple alkyl groups (methyl, ethyl, propyl, or butyl) and common anions (acetate, propionate, butyrate, valerate, caproate, caprylate, caprate, stearate, oleate, linoleate, linolenate). This structural parameter change simplifies the preparation process while maintaining high solubility enhancement capability for UV absorbers in cosmetic oils.
2Quantity of substance
If conventional ionic liquids are used to increase solubility of active ingredients, then solubility is improved, but the toxicity increases
Solution Approach 1:
The patent applies parameter changes by selecting specific biocompatible anions including carboxylates (acetate, propionate, butyrate, valerate, caproate, caprylate, caprate, stearate, oleate, linoleate, linolenate) that are naturally occurring and biodegradable. These parameter selections reduce toxicity while maintaining the solubility-enhancing function for cosmetic applications.
3Quantity of substance
If high concentrations of active ingredient are achieved, then the effectiveness is improved, but the chemical degradation by ionic liquid increases
Solution Approach 1:
The patent applies parameter changes by selecting chemically inert ammonium cations with saturated alkyl groups and stable carboxylate anions that do not react with UV absorbers. This parameter selection ensures chemical stability and prevents degradation even at high active ingredient concentrations, maintaining reliability of the cosmetic composition.
4Ease of manufacture
If simple ionic liquids are used, then the preparation is simplified, but the solubility enhancement capability is reduced
Solution Approach 1:
The patent applies parameter changes by optimizing the chain length of alkyl groups (1-4 carbons) and selecting common carboxylate anions that balance simplicity with effectiveness. These parameter choices enable easy preparation through standard synthesis methods while maintaining strong solubility enhancement capability for hydrophobic UV absorbers in cosmetic formulations.
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 achieves high solubility of UV absorbers, reduces toxicity, prevents chemical degradation, and simplifies ionic liquid preparation, enabling high concentrations and effective agrochemical performance with reduced organic solvent usage.
Implementation Method 1
a liquid composition comprising A) an organic active ingredient which is sparingly water-soluble and sparingly oil-soluble in dissolved form selected from the UV absorbers, B) an oil which is soluble in water at 20°C to at most 20 g/l, and C) an ionic liquid
Data Source
AI summary
Composition comprising active ingredient, oil and ionic liquid The present invention relates to a liquid composition comprising A) an organic active ingredient which is sparingly water-soluble and sparingly oil-soluble, in dissolved form, B) an oil which is soluble in water at 20°C to at most 20 g/l, and C) an ionic liquid comprising a cation and an anion as described below. Also provided is a process for the preparation of the liquid composition, where the active ingredient, the oil and the ionic liquid are brought into contact; and also the use of the ionic liquid for increasing the solubility of the active ingredient in an oil.