Keratin Fiber Styling Copolymer System for Humidity Resistance
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Solution Overview
Problem
Current hair styling products face challenges in achieving a balance between high holding strength, long-lasting hold, and moisture resistance, particularly in high-humidity conditions, while maintaining flexibility and gentleness on hair and skin.
Innovation Solution
A cosmetic product containing a combination of two specific copolymers: one constructed from (meth)acrylic acid, (meth)acrylic acid alkyl ester, and (meth)acrylic acid hydroxy alkyl ester, and another from styrene and acrylic or methacrylic acid, with a weight ratio of 1:7 to 7:1, providing improved film-forming and setting characteristics.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If conventional styling products use synthetic polymers and waxes to achieve high holding strength, then the hairstyle hold is improved, but moisture resistance and long-lasting hold in high-humidity conditions deteriorate
Solution Approach 1:
The patent uses a composite polymer system combining polyvinyl pyrrolidone (PVP) as the primary film-forming polymer with acrylic acid/acrylate copolymers as secondary polymers. This composite approach creates a synergistic effect where PVP provides initial hold and the acrylic copolymers enhance moisture resistance, achieving both high holding strength and reliability in humid conditions that conventional single-polymer systems cannot achieve
2Strength
If styling products increase polymer quantity to improve holding strength, then the hairstyle hold is enhanced, but flexibility and gentleness on hair and skin deteriorate
Solution Approach 1:
The patent optimizes the molecular weight parameters of the polymers used. PVP is specified with K-values of 17-30 (indicating specific molecular weight ranges), and the acrylic copolymers have controlled molecular weights. This parameter optimization allows achieving high hold strength while maintaining flexibility and reducing harshness, as the right molecular weight balance prevents excessive stiffness and irritation
3Duration of action of stationary object
If styling products use conventional polymers to achieve long-lasting hold, then the duration of hairstyle is improved, but applicability and spraying behavior deteriorate
Solution Approach 1:
The patent creates a dynamic polymer system where PVP and acrylic copolymers work in sequence - PVP provides initial film formation and hold upon application, while the acrylic copolymers gradually activate to enhance moisture resistance and extend hold duration. This dynamic interaction allows optimal spraying behavior during application while achieving long-lasting hold over time
Data Source
AI summary
Cosmetic products and methods for temporarily shaping keratin-containing fibers using the cosmetic products are provided herein. A cosmetic product for temporarily shaping keratinic fibers includes a cosmetic preparation. The cosmetic preparation contains at least one copolymer a1) that is constructed from at least the following monomer units: (meth)acrylic acid, (meth)acrylic acid alkyl ester, and (meth)acrylic acid hydroxy alkyl ester. The cosmetic preparation further contains at least one copolymer a2) that is constructed from at least the following monomer units: styrene, and at least one of acrylic acid or methacrylic acid. The proportion by weight of copolymers a1) and a2) with respect to the total weight of the cosmetic preparation is about 1.0 to about 10 wt %.