Cosmetic Base Polymer Composition for Moisturizing Without Stickiness
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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 moisturizing effect and feeling of use, particularly due to the structure and molecular weight of their polyether or alkylene oxide derivatives.
Innovation Solution
A cosmetic base comprising a polymer with a specific structure represented by Formula (1), where R1, R2, and R3 are independently hydrogen or alkyl groups with 1 to 4 carbon atoms, A is an alkylene group with 2 to 4 carbon atoms, m and n are 1.0 to 50, the number average molecular weight is 10,000 or less, and the IOB value is 0.4 to 1.8, providing a balanced moisturizing effect and feel.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If polyether or alkylene oxide derivatives are used for moisturizing, then moisturizing effect is improved, but feeling of use deteriorates due to stickiness and sliminess
Solution Approach 1:
The patent applies parameter changes by precisely controlling the molecular weight (number average molecular weight of 10,000 or less) and compositional ratios (m and n values between 1.0 to 50) of the polyether polymer. By adjusting these parameters, the invention achieves optimal balance between moisturizing effectiveness and sensory comfort, eliminating the stickiness and sliminess associated with conventional higher molecular weight polyethers while maintaining hydration benefits.
Solution Approach 2:
The patent employs composite material principles by creating a copolymer structure that combines different polyether units with specific ratios. The copolymer comprises units with different carbon atom counts in the oxyalkylene groups (3-4 carbons from propylene oxide/butylene oxide and 2 carbons from ethylene oxide), forming a composite molecular structure that delivers both moisturizing performance and pleasant tactile properties.
2Reliability
If molecular weight of polyether is increased to improve moisturizing, then moisturizing effect is improved, but ease of blending and spreading deteriorates
Solution Approach 1:
The patent applies parameter changes by setting the number average molecular weight to 10,000 or less, which is significantly lower than conventional polyether moisturizers. This molecular weight parameter optimization enables the polymer to blend and spread easily on the skin while retaining sufficient moisturizing capability through the specific copolymer structure and compositional ratios.
Data Source
AI summary
Provided is a new cosmetic base that achieves both feel on use and a moisturizing effect. The cosmetic base contains or comprises a polymer having a structure represented by formula (1). In formula (1), R1, R2, and R3 each independently are a hydrogen atom or a C1-4 alkyl group, A is a C2-4 alkylene group, and m and n are each independently 1.0-50. The number average molecular weight of the polymer is 10,000 or less, and the IOB value of the polymer is 0.4-1.8.