Cationizable Copolymer for Stable Cosmetic Films
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing cosmetic polymers face challenges in achieving a balance between stability and flexibility, leading to either unstable soft films that disintegrate in weather conditions or rigid films that break with mechanical stress, resulting in poor styling and conditioning performance and increased costs due to the need for higher polymer amounts.
Innovation Solution
A copolymer comprising a branched acrylic ester, a linear acrylic ester, a cyclic N-vinyl amide, a compound with a radically polymerizable α,β-ethylenically unsaturated double bond and a cationic/cationogenic moiety, and a monoethylenically unsaturated carboxylic acid, with monomer B making at most one third of the weight of monomer A, optimizing glass transition temperature to provide flexibility and rigidity, ensuring adherence and easy removal without flaking.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If n-butylacrylate and ethoxylated polysiloxane are used to provide flexibility and softness, then conditioning performance is improved, but polymer film stability deteriorates and disintegration occurs in windy or rainy weather
Solution Approach 1:
The patent changes the chemical composition parameters by replacing n-butylacrylate with isobutylacrylate and adjusting the ratio of rigidifying monomers (acrylic acid, methacrylic acid) to flexible monomers (isobutylacrylate, tert-butylacrylate). This parameter optimization achieves the right balance between film stability and flexibility, preventing both disintegration and excessive rigidity.
Solution Approach 2:
The patent creates a composite polymer structure combining multiple monomer types: rigidifying monomers (acrylic acid, methacrylic acid), flexible monomers (isobutylacrylate, tert-butylacrylate), and cationic monomers. This composite approach integrates opposing properties (rigidity and flexibility) within a single polymer system, achieving both film stability and conditioning performance.
2Reliability
If n-butylacrylate and ethoxylated polysiloxane are omitted to improve stability, then polymer film stability is improved, but flexibility deteriorates and rigid films break under mechanical stress
Solution Approach 1:
The patent optimizes the concentration parameters of flexible monomers (isobutylacrylate 5-20%, tert-butylacrylate 10-30%) to provide sufficient flexibility without compromising stability. By precisely controlling these parameters, the polymer achieves both film stability and resistance to mechanical breaking.
Solution Approach 2:
The patent introduces cationic monomers (containing amino groups) as intermediaries that bridge the rigid and flexible components. These cationic groups provide adherence to negatively charged surfaces while the overall polymer structure maintains both rigidity and flexibility, preventing film breakage under stress.
3Reliability
If larger amounts of polymer are applied to compensate for film instability, then styling performance is maintained, but cost increases
Solution Approach 1:
The patent optimizes the polymer composition parameters to achieve maximum styling performance at lower concentrations. The balanced monomer ratio and inclusion of cationic groups enhance adherence and film integrity, allowing effective styling with reduced polymer dosage, thereby lowering cost per application.
4Reliability
If rigid polymer films are formed to maintain hairstyle shape, then styling performance is improved, but mechanical resistance deteriorates and flakes break under combing or brushing
Solution Approach 1:
The patent creates a composite polymer structure integrating rigidifying monomers (acrylic acid, methacrylic acid) with flexible monomers (isobutylacrylate, tert-butylacrylate) and cationic monomers. This composite design produces films that simultaneously maintain hairstyle shape and resist mechanical breaking during combing or brushing.
Solution Approach 2:
The patent applies local quality by distributing different monomer types throughout the polymer structure, creating regions of varying rigidity. The cationic groups provide localized adherence to hair surfaces, while flexible segments provide mechanical resilience, achieving both hairstyle maintenance and break resistance.
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 copolymer achieves a balance of styling and conditioning performance, reducing the amount needed for the same effect, enhancing stability and flexibility, and maintaining a clear, non-turbid appearance while being cost-effective and compatible with propellants.
Implementation Method 1
a compound having a free-radically polymerizable, α,β-ethylenically unsaturated double bond
Implementation Method 2
at least one compound having a free-radically polymerizable, α,β-ethylenically unsaturated double bond and at least one cationogenic and/or cationic group per molecule
Data Source
AI summary
Provided are: a copolymer for rheological or cosmetic compositions and, a composition thereof, and methods of making and using the same. Said copolymer comprisesa) a first acrylic ester as monomer A, said monomer A being a branched acrylic ester;b) at least one further acrylic ester as monomer B, said monomer B being a linear acrylic ester;c) a cyclic N-vinyl amide as monomer C;d) at least one compound comprising a radically polymerizable α.β-ethylenically un-saturated double bond and at least one cationic and/or cationogenic moiety said compound being monomer D;e) at least one monoethylenically unsaturated carboxylic acid as monomer E; with the monomer B in its polymerized form having a glass transition temperature of 24° C. or lower and making at most one third of the weight amount of monomer A.