Thermosensitive Ampholyte Copolymers for Cosmetic Adsorption
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Solution Overview
Problem
Existing polymers used in cosmetics lack sufficient adsorption properties on the skin and hair, and thermo-thickening properties, making them unsuitable for cosmetic applications.
Innovation Solution
Development of thermosensitive ampholyte copolymers with specific crosslinking monomers and cationic monomers, such as quaternary ammonium salts, which exhibit good adsorption and temperature-dependent thickening properties, allowing for their use in cosmetic compositions like shampoos, conditioners, and lotions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If crosslinked polyampholytes are used for preventing water ingress in wells, then they provide good mechanical stability and temperature stability, but they do not adsorb sufficiently on the skin or hair for cosmetic use
Solution Approach 1:
The patent applies local quality by creating a comb copolymer structure where the polymeric skeleton provides mechanical stability while the macromonomeric lateral segments provide adsorption properties. This structural differentiation allows different parts of the molecule to fulfill different functions: the backbone ensures thermal and mechanical stability, while the pendant macromonomeric segments enable adsorption on skin and hair surfaces through their specific chemical composition and flexibility.
Solution Approach 2:
The invention creates a composite polymer structure combining the polymeric skeleton with macromonomeric lateral segments that have different functional properties. The comb copolymer integrates the stability characteristics of crosslinked polyampholytes with the adsorption capabilities of macromonomers, resulting in a material that exhibits both mechanical stability and sufficient adsorption on skin and hair for cosmetic applications.
2Productivity
If thermo-thickening polymers are used, then they provide temperature-dependent thickening, but they do not adsorb sufficiently on the skin or hair
Solution Approach 1:
The comb copolymer structure enables local quality differentiation where the polymeric skeleton maintains temperature-dependent thickening properties while the macromonomeric lateral segments provide adsorption functionality. This allows the polymer to simultaneously exhibit thermo-thickening behavior and adsorb on skin and hair surfaces, resolving the contradiction between these two desired properties.
Solution Approach 2:
The invention creates a composite polymer architecture that integrates thermo-thickening capabilities with adsorption properties. The macromonomeric lateral segments attached to the polymeric skeleton create a material that combines the temperature-responsive viscosity enhancement of thermo-thickening polymers with the surface adsorption characteristics needed for cosmetic applications.
3Ease of operation
If polymers with good adsorption properties are developed, then they can be used in cosmetics, but they lack temperature-dependent thickening properties
Solution Approach 1:
The comb copolymer structure distributes functional properties to different parts of the molecule: the macromonomeric lateral segments are designed to maximize adsorption on skin and hair, while the polymeric skeleton maintains the temperature-dependent thickening capability. This spatial separation of functions allows both adsorption and thermo-thickening properties to coexist in a single polymer material.
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 resulting polymers demonstrate enhanced viscosity at different temperatures, making them effective as thickeners and emulsifiers in cosmetic products, improving hair and skin care by providing better adhesion and conditioning properties.
Implementation Method 1
They are thermosensitive in the sense that their chains pass through a coil-to-globule transition upon heating, which is accompanied by an increase in the viscosity of their aqueous solutions
Implementation Method 2
those disclosed in this French patent application number 2,932,183 do not adsorb sufficiently on the skin or hair to be used in cosmetics
Data Source
AI summary
A comb copolymer consisting of a polymer backbone on which lateral macromonomer segments are grafted, characterised in that said polymer backbone consists: Of more than 55% and up to 90% molar of monomeric units from 2-methyl-2-[(1-oxo-2-propenyl)-amino]-1 -propanesulphonic acid (hereinafter referred to as ATBS), Of between 1% and 20 % molar, and more specifically of between 4% and 15% molar, either of monomeric units from a cationic monomer or of monomeric units from a monomer of formula (I): CH2=C(R1)-C(=0)-Y-(CH2)m-N(R2)(R3) in which m represents a number of between 1 and 4, Y represents O or NH, R-i represents a hydrogen atom or a methyl radical, R2 and R3, identical or different, represent a methyl radical or an ethyl radical; - Optionally of 0.005% molar to 1% of monomeric units from at least one cross-linking monomer comprising at least two carbon-carbon double bonds, and in that said lateral macromonomer segments are, for 100% molar constituting said comb copolymer, derived from the polymerisation of 9% to 30% molar of N-alkyl acrylamide or Ν,Ν-dialkyl acrylamide of formula (II): CH2=C(R4)-C(=0)-N(R5)(R6), in which R4 represents a hydrogen atom or a methyl radical and R5 and R6 represent, independent of each other, a hydrogen atom or an alkyl radical comprising 1 to 3 carbon atoms, it being understood that at least one of the R5 or R6 radicals does not represent a hydrogen atom, the method for the preparation and the use thereof as a thickener in cosmetics.