Cosmetic Base Polymer Composition for Moisturizing Without Stickiness
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Solution Overview
Problem
Existing moisturizers, such as those described in PTL 1, fail to achieve a balance between feeling of use and moisturizing effect due to their structural characteristics, particularly the type of substituents and molecular weight of the polyether.
Innovation Solution
A cosmetic base comprising a polymer with a specific structure represented by Formula (1), where R1 is an alkyl group of 1 to 4 carbon atoms, R2 and R3 are independently hydrogen or alkyl groups of 1 to 4 carbon atoms, m and n are 1 to 50, the number average molecular weight is 10,000 or less, and the 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 a polyether with specific structure (as disclosed in PTL 1) is used to achieve moisturizing effect, then the moisturizing function is improved, but the feeling of use becomes unsatisfactory due to stickiness and molecular weight issues
Solution Approach 1:
The patent changes the molecular weight parameter of the polyether to 10,000 or less (down from conventional higher values) and adjusts the IOB value to 0.4-1.8, which fundamentally alters the physical properties and feeling of use while maintaining moisturizing efficacy
Solution Approach 2:
The patent introduces specific substituent groups (R1-R8) with defined chemical properties at specific positions on the polyether chain, creating local regions with optimized hydrophilicity-lipophilicity balance that improve both moisturizing effect and feeling of use
2Reliability
If the molecular weight of the polyether is increased to improve moisturizing efficacy, then the moisturizing effect is enhanced, but the feeling of use deteriorates with increased stickiness and reduced spreadability
Solution Approach 1:
The patent sets the molecular weight parameter to 10,000 or less, which is a significant reduction from conventional polyether moisturizers. This parameter change optimizes both the moisturizing efficacy and the spreadability by preventing excessive viscosity while maintaining sufficient moisture retention capability
3Reliability
If conventional polyether structures are used to achieve moisturizing function, then the moisturizing effect is provided, but the cosmetic feels sticky and slimy on application
Solution Approach 1:
The patent adjusts the IOB (inorganic/organic balance) value to the specific range of 0.4-1.8, which optimizes the balance between hydrophilic and lipophilic properties. This parameter change eliminates excessive stickiness and sliminess while preserving the essential moisturizing function
Solution Approach 2:
The patent creates a composite molecular structure combining polyether chains with specific substituent groups (R1-R8) that have different polarities. This composite structure at the molecular level provides moisturizing function while the varied chemical groups prevent excessive adhesion to skin, reducing sticky and slimy feelings
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.