Keratin Fiber Styling Polymer System for Balanced Hold and Flexibility
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Solution Overview
Problem
Cosmetic products face challenges in achieving a balance of film-forming, strengthening, and holding properties without sacrificing flexibility and moisture resistance, particularly in styling agents, where multiple polymers can react and cause formulation issues or accumulation on hair and skin.
Innovation Solution
A specific polymer combination is used, comprising a copolymer of allyl methacrylate with acrylic acid or its esters and a polymeric quaternary ammonium compound based on vinylpyrrolidone and methacrylamidopropyltrimethylammonium chloride, formulated in a cosmetically acceptable carrier to provide enhanced holding power, flexibility, and moisture resistance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If multiple polymers are used to achieve different effects (film-forming, strengthening, holding), then the desired properties are improved, but formulation problems occur due to polymer reactions and precipitation
Solution Approach 1:
The patent specifies precise compositional parameters for the copolymer (allyl methacrylate 20-80 mol%, acrylic acid 10-40 mol%, crosslinking agent 1-20 mol%) and controlled molecular weight ranges (10,000-1,000,000 g/mol) to ensure compatibility and prevent precipitation while maintaining desired film-forming and strengthening properties
Solution Approach 2:
The invention creates a composite polymer system combining allyl methacrylate copolymer with specific crosslinking agents and optional polyquaternium compounds, where the components work synergistically to provide both film-forming capability and formulation stability without precipitation
2Strength
If polymers are used to provide strong hold in styling products, then the holding power is improved, but flexibility and moisture resistance are compromised
Solution Approach 1:
The patent introduces crosslinking agents at specific concentrations (1-20 mol% of total monomers) to create localized crosslinked structures within the polymer chains, providing strong hold in critical areas while maintaining overall chain flexibility and moisture resistance
Solution Approach 2:
The composite polymer system combines linear copolymer segments (providing flexibility) with crosslinked network structures (providing hold), creating a material that simultaneously delivers strong holding power and maintains flexibility and moisture resistance
3Duration of action of stationary object
If polymers are used to achieve high retention and hold, then the styling effectiveness is improved, but the polymers accumulate on hair and skin during normal washing
Solution Approach 1:
The patent controls polymer molecular weight within specific ranges (10,000-1,000,000 g/mol) and adjusts copolymer composition to optimize the balance between retention duration and washability, preventing excessive accumulation while maintaining effective styling
Data Source
AI summary
The invention relates to cosmetic product containing in a cosmetically acceptable carrier a) at least one copolymer (a) of the allyl methacrylate with one or more monomers selected from acrylic acid, methacrylic acid, acrylic acid ester and methacrylic acid ester, b) at least one polymeric quaternary ammonium compound (B) from the group of vinylpyrrolidone copolymers, said cosmetic product being particularly suitable for temporarily shaping keratin fibers.