Carboxyl-Modified Organopolysiloxane Powder for Cosmetic Water-Resistance
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Solution Overview
Problem
Existing surface-treated powders lack satisfactory water-resistance and dispersivity in unctuous agents, primarily due to the presence of polar groups like amide and carbonyl groups in organopolysiloxanes, which hinder their performance in cosmetic applications.
Innovation Solution
A powder surface-treated with an organopolysiloxane having a specific average compositional formula, featuring highly reactive carboxyl groups, is developed to enhance water-resistance and dispersivity in unctuous agents, achieved through a process involving an organohydrogenpolysiloxane, acid anhydride, and a catalyst, resulting in a stable dispersion and improved cosmetic usability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If powder is surface-treated with conventional organopolysiloxane containing amide and carbonyl groups, then water-resistance is improved, but dispersivity in unctuous agent deteriorates
Solution Approach 1:
The invention changes the chemical parameters of the organopolysiloxane by strictly limiting the content of amide groups to 0.1 mol% or less and carbonyl groups to 0.5 mol% or less, while introducing carboxyl groups at controlled levels (0.01-2.0 mol%). This parameter optimization resolves the contradiction by achieving water-resistance through carboxyl groups without the dispersivity penalty of excessive amide/carbonyl groups
Solution Approach 2:
The invention creates a composite surface treatment effect by combining multiple functional groups in specific proportions: carboxyl groups for water-resistance, controlled amounts of amide/carbonyl groups for adhesion, and hydrophobic R1 groups for dispersivity. The composite structure of the organopolysiloxane molecule itself (combining Si-O backbone with various side chains) enables simultaneous achievement of water-resistance and dispersivity
2Reliability
If powder is surface-treated with organopolysiloxane having high carboxyl group content, then water-resistance is improved, but dispersivity in unctuous agent deteriorates
Solution Approach 1:
The invention optimizes the carboxyl group content parameter within a specific range (0.01-2.0 mol%), preventing both insufficient water-resistance (too low) and poor dispersivity (too high). This parameter balancing resolves the contradiction by identifying the optimal window where carboxyl groups provide adequate water-resistance without excessive polarity that would harm dispersivity
Solution Approach 2:
The invention applies local quality by distributing different functional groups at specific locations within the organopolysiloxane structure: carboxyl groups at terminal positions for water-resistance, hydrophobic alkyl/aryl groups at other positions for dispersivity, and controlled amide/carbonyl groups for adhesion. This spatial distribution enables simultaneous optimization of contradictory properties
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 treated powder exhibits excellent water-resistance and dispersivity, leading to stable cosmetic formulations with improved skin and hair product performance, including enhanced spreadability and resistance to sweat and water.
Implementation Method 1
powder surface-treated with an organopolysiloxane having carboxyl groups
Data Source
AI summary
A powder surface-treated with an organopolysiloxane represented by the following average compositional formula (1):R1aR2bR3cSiO(4-a-b-c)/2 (1)wherein R1 is selected from the group consisting of C1-30 alkyl, C1-30 fluoroalkyl, C6-30 aryl, and C6-30 aralkyl groups,R2 is a group represented by the following formula (2), provided that R2 is bonded to at least one terminal end of the organopolysiloxane when c equals 0,R3 is a group represented by the following formula (3):wherein R2 is as defined above, each R8 is, independently, selected from the group consisting of C1-30 alkyl, C1-30 fluoroalkyl, C6-30 aryl, and C6-30 aralkyl groups, Q is CdH2d or an oxygen atom, wherein d is an integer of from 1 to 5, k is an integer of from 0 to 500, and h is an integer of from 0 to 3,a is a number of from 1.5 to 2.5,b is a number of from 0.001 to 1.5, andc is a number of from 0 to 1.5.