Isobutyl Acrylate Block Polymer Oil Resistance
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Solution Overview
Problem
Block polymers used in cosmetic applications are sensitive to fatty substances like edible oils and sebum, which limits their effectiveness in makeup compositions due to their film-forming properties.
Innovation Solution
Development of di- or tri-block polymers with specific structures, such as AB, ABA, or BAB, comprising isobutyl acrylate and acrylic acid, which are designed to be less sensitive to fatty substances and have improved resistance to olive oil, allowing for better film-forming capabilities in non-aqueous media.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If block polymers are used for film-forming in cosmetic applications, then film-forming properties are improved, but sensitivity to fatty substances (edible oils and sebum) increases
Solution Approach 1:
The patent changes the chemical composition parameters of the polymer blocks, specifically incorporating isobutyl acrylate (70-90 wt%) and acrylic acid (10-30 wt%) in block A, and using specific vinyl esters or vinyl ethers in block B. This compositional parameter change reduces sensitivity to fatty substances while preserving film-forming capabilities.
Solution Approach 2:
The patent creates a composite block polymer structure where block A (isobutyl acrylate-co-acrylic acid) and block B (vinyl ester or vinyl ether) are combined in an AB or BAB architecture. This composite structure synergistically provides both film-forming properties and resistance to fatty substances, resolving the contradiction between these two requirements.
2Ease of operation
If block polymers are made soluble in non-aqueous media, then ease of operation in makeup compositions is improved, but resistance to olive oil deteriorates
Solution Approach 1:
The patent changes the chemical structure parameters by selecting specific vinyl esters (with C8-C22 alkyl groups) or vinyl ethers (with C8-C22 alkyl groups) for block B, and controlling the molecular weight and architecture (AB or BAB). These parameter changes enable solubility in non-aqueous media while maintaining or improving olive oil resistance compared to conventional block polymers.
Data Source
AI summary
The invention relates to a diblock or triblock polymer having structure AB, ABA or BAB, including at least one sequence A which includes isobutyl acrylate and acrylic acid. The invention also relates to a cosmetic composition including, in a cosmetically acceptable medium, at least one such polymer, and to a treatment method using same.