PHA Copolymer Cosmetic Composition with Clay for Oil Resistance

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Solution Overview

Problem

Existing cosmetic compositions using polyhydroxyalkanoate (PHA) copolymers lack resistance to oils and sebum, and do not effectively modify the gloss or mattness of keratin materials.

Innovation Solution

A cosmetic composition comprising PHA copolymers with (un)saturated hydrocarbon-based groups, clay, and optionally fatty substances and organic solvents, which provides improved resistance to oils and sebum, and allows for modification of gloss or mattness on keratin materials.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If conventional PHA copolymers are used in cosmetic compositions, then the composition can be formulated in aqueous media, but the film formed on keratin materials lacks resistance to oils and sebum

Engineering Contradiction:

Improveresistance to oils and sebumVSAvoidformulation flexibility

Core Design Contradiction:

ReliabilityVSAdaptability or versatility

Solution Approach 1:

The patent modifies the chemical structure of PHA copolymers by changing parameters such as introducing (un)saturated hydrocarbon-based groups and adjusting the ratio of different monomer units. This structural parameter change enables the polymer to interact with oils and sebum while maintaining aqueous formulation capability.

Inventive Principle:

Principle #35Parameter changes

Solution Approach 2:

The invention creates a composite polymer structure combining PHA units with hydrocarbon-based groups, forming a copolymer that integrates both hydrophilic (PHA) and lipophilic (hydrocarbon) characteristics. This composite structure provides dual functionality: resistance to oils/sebum while remaining formable in aqueous media.

Inventive Principle:

Principle #40Composite materials

2Reliability

If film-forming polymers are used to create makeup products, then the desired cosmetic effect can be achieved, but the deposits lack resistance to rubbing and transfer

Engineering Contradiction:

Improveresistance to rubbingVSAvoidtransfer to clothing

Core Design Contradiction:

ReliabilityVSObject-generated harmful factors

Solution Approach 1:

The patent changes the chemical parameters of the polymer by incorporating (un)saturated hydrocarbon-based groups with specific carbon chain lengths (C5-C28). This structural modification increases the polymer's interaction strength with keratin materials and reduces its tendency to transfer, while maintaining the desired cosmetic appearance.

Inventive Principle:

Principle #35Parameter changes

3Reliability

If PHA copolymers are used to modify gloss or mattness, then the cosmetic property can be changed, but the film lacks persistence and runs

Engineering Contradiction:

Improvepersistence of colorVSAvoidapplication smoothness

Core Design Contradiction:

ReliabilityVSEase of operation

Solution Approach 1:

The invention develops a composite polymer architecture where PHA units provide film-forming and cosmetic effect while hydrocarbon-based groups provide structural integrity and persistence. This composite structure prevents running during application while maintaining smooth application and long-lasting color.

Inventive Principle:

Principle #40Composite materials

Data Source

PatentUS20250041201A1Cosmetic composition comprising a polyhydroxyalkanoate copolymer bearing a(n) (UN)saturated hydrocarbon-based chain and a clay

Publication Date: 2025.02.06 LOREAL SA

AI summary

The present invention relates to a cosmetic composition comprisinga) one or more polyhydroxyalkanoate (PHA) copolymers which contain, and preferably consist of, several repeating units chosen from the units (A) below, and also the optical or geometrical isomers thereof, the organic or mineral acid or base salts thereof, and the solvates thereof such as hydrates:—[—O—CH(R1)—CH2—C(O)—]— unit (A)in which polymer units (A):R1 is as defined in the description;b) one or more clays.