Polyhydroxyalkanoate Copolymer Film for Oil-Resistant Matte Finish
Solution Overview
Problem
Existing cosmetic compositions with polyhydroxyalkanoates lack sufficient resistance to oils and sebum, and do not provide a matte finish, limiting their cosmetic efficacy.
Innovation Solution
A cosmetic composition comprising a polyhydroxyalkanoate copolymer with specific polymeric units A, B, and C, dissolved in an oily medium with non-silicone oils, such as ester oils and hydrocarbon oils, which provides stability and resistance to oils and sebum, and a matte appearance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a polyhydroxyalkanoate is used in a cosmetic composition, then the composition can form a film, but the film lacks sufficient resistance to oils and sebum and does not provide a matte finish
Solution Approach 1:
The patent changes the chemical parameters of the polyhydroxyalkanoate by introducing specific copolymer units (A, B, and C) with defined alkyl chain lengths. Unit A has R1 with 5-9 carbon atoms, unit B has R2 with R1-2 carbon atoms, and unit C has R3 with R1-4 carbon atoms. This parameter modification enables the polymer to achieve both oil resistance and matte finish properties simultaneously.
Solution Approach 2:
The patent creates a composite polymer structure by combining three different polymeric units (A, B, and C) within a single copolymer chain. This composite approach allows the material to integrate multiple functional properties: film-forming capability from the polymer backbone, oil resistance from specific units, and matte finish from the combined structure, thereby resolving the contradiction between reliability and ease of manufacture.
2Stability of the object's composition
If a polyhydroxyalkanoate is dissolved in an oily medium, then the composition achieves stability, but the film does not exhibit good resistance to oils and sebum
Solution Approach 1:
The patent modifies the polymer's chemical parameters by incorporating specific copolymer units with controlled alkyl chain lengths (R1: 5-9 carbons, R2: R1-2 carbons, R3: R1-4 carbons). These parameter changes enable the polymer to maintain solubility in oily media while simultaneously achieving resistance to oils and sebum, resolving the contradiction between stability and reliability.
3Shape
If a polyhydroxyalkanoate is used to achieve a matte appearance, then the cosmetic properties improve, but the composition lacks persistence
Solution Approach 1:
The patent employs a composite polymer structure combining units A, B, and C with specific alkyl chain lengths. This composite material approach enables the film to achieve matte appearance through the specific arrangement of hydrocarbon chains while maintaining persistence through the cross-linked polymer network structure, thereby resolving the contradiction between appearance and duration.
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 composition achieves a stable, film-forming solution with good resistance to oils and sebum, maintaining a matte appearance and persistence, suitable for keratinous substances like skin and hair.
Implementation Method 1
specific polyhydroxyalkanoate copolymers, as defined below, can be easily employed in the oily media specially selected, thus making it possible to obtain homogeneous compositions because of the good solubilization of the copolymer in the oily medium
Implementation Method 2
The composition, in particular after its application to keratinous substances, makes it possible to obtain a film having good cosmetic properties, in particular good resistance to oils and to sebum
Implementation Method 3
PHA is used to absorb oily substance in order to obtain a 'soft focus' effect on skin
Data Source
AI summary
The invention relates to a composition comprising: a) a polyhydroxyalkanoate copolymer comprising the following polymeric units A, B and C: —[—O—CH(R1)—CH2—CO—]-unit A —[—O—CH(R2)—CH2—CO—]-unit B —[—O—CH(R3)—CH2—CO—]-unit C in which: R1 denotes a linear alkyl radical having from 5 to 9 carbon atoms; R2 denotes a linear alkyl radical having a carbon number corresponding to the number of carbon atoms of the R1 radical −2; R3 denotes a linear alkyl radical having a carbon number corresponding to the number of carbon atoms of the R1 radical −4; b) an oily medium comprising a non-silicone oil chosen from ester oils, carbonate oils and nonpolar hydrocarbon oils having from 8 to 14 carbon atoms.