Cosmetic Base Copolymer Balancing Moisture and Use Sensation
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Solution Overview
Problem
Existing cosmetic bases, such as those described in PTL 1 and PTL 2, fail to achieve a balance between feeling of use and moisturizing effect due to their structural and molecular weight characteristics.
Innovation Solution
A cosmetic base composed of a polymer with a specific structure represented by Formula (1), where R1 is a C1-4 alkyl group, R2 and R3 are independently H or C1-4 alkyl, m and n are 1 to 50, number-average molecular weight is 10,000 or less, and IOB value is 0.4 to 1.8, providing a random copolymer with high water and lipid solubility.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional polyether structures are used in cosmetic bases, then moisturizing effect is achieved, but sticky feeling and poor feeling of use occur
Solution Approach 1:
The patent applies parameter changes by precisely controlling the molecular structure of the polyether, specifically setting the number average molecular weight to 10,000 or less and defining the ratio between polyoxyalkylene units and polyalkylene oxide units. This structural parameter optimization resolves the contradiction by achieving effective moisturizing while eliminating the sticky feeling associated with conventional higher molecular weight polyethers.
Solution Approach 2:
The patent employs composite material principles by creating a copolymer structure that combines different polyether units (polyoxymethylene, polyoxyethylene, polyoxypropylene) in specific ratios. This composite approach allows the material to exhibit both strong moisturizing properties and pleasant sensory characteristics, balancing efficacy with user comfort.
2Reliability
If polyether with high molecular weight is used, then moisturizing capability is enhanced, but stickiness and sliminess increase
Solution Approach 1:
The patent directly addresses this contradiction through parameter changes by establishing that the number average molecular weight must be 10,000 or less. This specific molecular weight parameter optimization maintains sufficient moisturizing capability while preventing the excessive stickiness and sliminess that characterize higher molecular weight polyethers.
3Reliability
If conventional polyether structures are used, then moisturizing function is provided, but balance between feeling of use and moisturizing effect is insufficient
Solution Approach 1:
The patent achieves the desired balance through comprehensive parameter changes including molecular weight control (≤10,000), specific unit ratios (polyoxymethylene 30-70%, polyoxyethylene 10-60%, polyoxypropylene 10-60%), and substituent constraints. These optimized parameters deliver both effective moisturizing function and pleasant sensory characteristics simultaneously.
Solution Approach 2:
The patent applies local quality principles by specifying particular structural characteristics at different levels of the polyether molecule - the backbone composition, the substituent types (C1-4 alkyl groups), and the molecular weight distribution. This multi-level structural optimization ensures both functional performance and sensory quality are achieved in their respective domains.
Data Source
AI summary
Provided is a novel cosmetic base that achieves both a use sensation and a moisturizing effect. The cosmetic base contains or consists of a polymer having the structure represented by formula (1) wherein, in formula (1), R1 is a C1-4 alkyl group, R2 and R3 are each independently a hydrogen atom or C1-4 alkyl group, m and n are each independently 1 to 50, the number-average molecular weight of the polymer is not greater than 10,000, and the IOB value of the polymer is 0.4 to 1.8.