PHA Copolymer Cosmetic Composition for Rubbing Resistance
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Solution Overview
Problem
Existing cosmetic compositions using polyhydroxyalkanoate (PHA) copolymers lack resistance to oils, sebum, and rubbing, leading to unsightly transfer and poor persistence of color or finish on keratin materials.
Innovation Solution
A cosmetic composition comprising PHA copolymers with specific repeating units, oligo/polyesters, fatty substances, and optional organic solvents, which provides improved resistance to oils, sebum, and rubbing, while allowing modification of gloss or matte finish.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional PHA copolymers are used in cosmetic compositions, then the composition can be formulated with film-forming properties, but the composition lacks resistance to oils, sebum, and rubbing
Solution Approach 1:
The patent uses a composite polymer system combining PHA copolymer (providing film-forming and cosmetic properties) with polyurethane copolymer (providing resistance to oils, sebum, and rubbing). This composite approach allows the composition to achieve both good cosmetic appearance and superior resistance properties that neither polymer could provide alone.
Solution Approach 2:
The invention modifies the chemical structure parameters of the PHA copolymer by incorporating specific hydrocarbon-based side chains with controlled length and saturation. These parameter changes in the polymer structure enhance the composition's resistance to oils and sebum while maintaining film-forming capabilities.
2Reliability
If film-forming polymers are used to create cosmetic deposits, then the deposits provide color and finish, but they lack resistance to rubbing and transfer
Solution Approach 1:
The patent creates a composite film-forming system where PHA copolymer provides the cosmetic deposit with color and finish, while polyurethane copolymer contributes resistance to rubbing and transfer. The synergistic combination ensures the cosmetic deposit remains intact and resistant during normal wear.
Solution Approach 2:
The invention assigns different functional properties to different components of the polymer mixture: PHA copolymer is optimized for film-forming and cosmetic appearance, while polyurethane copolymer is optimized for mechanical resistance. Each component performs its specialized function locally within the composite system.
Data Source
AI summary
The present invention relates to a composition comprising a) at least one polyhydroxyalkanoate (PHA) copolymer containing (un)saturated hydrocarbon-based groups, b) at least one oligo/polyester, c) optionally at least one fatty substance, and d) optionally at least one organic solvent other than c), and also to a process for treating keratin materials using such a composition.