Self-Reversible Reverse Latex Thickening in Cosmetics
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Solution Overview
Problem
Existing inverse latexes used in cosmetics and pharmaceuticals face issues such as high water and oil content, destabilization during vacuum distillation, environmental concerns from stabilizing polymers, difficulty in inversion, high viscosity, and rapid syneresis, which hinder their industrial application.
Innovation Solution
A self-invertible inverse latex composition comprising 50-70% crosslinked anionic polyelectrolyte, 4-10% water-in-oil emulsifying system, and 1-10% oil-in-water emulsifying system with specific surfactant compositions, allowing for efficient thickening and emulsification in cosmetic and pharmaceutical preparations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If vacuum distillation is used to remove water and oil from the reaction medium, then the concentration of polyelectrolytes in the inverse latex is increased, but the inverse latex becomes destabilized
Solution Approach 1:
A stabilizing agent is added to the inverse latex before vacuum distillation to prevent destabilization during the concentration process. This preliminary action ensures that the polyelectrolyte concentration can be increased without compromising the stability of the final product.
2Stability of the object's composition
If stabilizing polymers containing alcohols or glycols are added to prevent destabilization, then the inverse latex remains stable during distillation, but environmental problems arise
Solution Approach 1:
The patent uses a stabilizing agent that does not contain harmful alcohols or glycols, replacing environmentally problematic substances with a safer alternative that achieves the same stabilizing function without negative environmental impact.
3Quantity of substance
If the reaction medium is subjected to distillation, then water and oil are removed, but the medium may set solid and destroy the batch
Solution Approach 1:
The stabilizing agent is introduced before distillation to prevent the reaction medium from setting solid during the concentration process, ensuring continuous operability and preventing batch destruction.
4Quantity of substance
If inverse latexes are obtained after distillation, then they can be used in formulations, but they exhibit high viscosity and difficulty in inversion
Solution Approach 1:
The patent modifies the chemical structure of the polyelectrolyte by incorporating specific monomer units (acrylamide, methacrylamide, and their derivatives) that change the physical parameters of the inverse latex, reducing viscosity and improving inversion characteristics while maintaining high concentration.
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 exhibits rapid and stable inversion in an aqueous phase, reducing industrial processing time and improving long-term stability, while avoiding environmental concerns and maintaining effective thickening and emulsification properties.
Implementation Method 1
its rate of inversion in the aqueous phase, that is to say the time necessary to obtain the maximum development of the viscosity
Implementation Method 2
from 4% by weight to 10% by weight of an emulsifying system (S1) of water-in-oil (W/O) type; from 1% by weight to 10% by weight of an emulsifying system (S2) of oil-in-water (O/W) type
Data Source
AI summary
A self-reversible reverse latex, and its use as a thickener. The self-reversible reverse latex includes: 50%-70 of a cross-linked polyelectrolyte obtained by the polymerization of a monomer of formula (I), with R1 being 8 to 20 carbon atoms and 1≦n≦30 for a neutral monomer, and a monomer having an acid function; 4%-10% of a water-in-oil emulsifier; 1%-10% of an oil-in-water emulsifier including a surface-active composition (C); 15%-45% oil; and 0%-5% water. Composition (C) is 10%-50% composition (CII) and 50%-90% composition(CIII). Composition(CII) is 60%-100% of a composition of formula (II), with R2 being a 12 carbon alkyl, T1, T2, and T3 being H or a (—CH2—CH2—O—)mi—H radical with 0≦mi≦10 and 0<Σmi≦10. Composition (CIII) is 60%-100% of a compound of formula (III) or mixtures of (III) and (IV), with R2 being as defined previously.