Wet Indicator Composition for Fast Discoloration and Low Odor
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Solution Overview
Problem
Conventional wet indicators have inadequate moisture permeability, delayed discoloration, and unpleasant odors, which affect their performance and user experience.
Innovation Solution
A composition for wet indicators comprising hydrocarbon oil, saturated fatty acids with 16 or more carbon atoms, and a wet-sensitive colorant composition, including leuco dyes and anionic surfactants, which enhances moisture permeability, rapid discoloration, and reduces odor.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If a thermoplastic resin is used as the matrix in conventional wet indicator compositions, then the structural integrity is maintained, but the moisture permeability is insufficient and discoloration is delayed
Solution Approach 1:
The patent changes the chemical composition parameters of the matrix by replacing thermoplastic resin with specific hydrocarbon oils (paraffin oil, naphthene oil, or aromatic hydrocarbon oil) in controlled amounts (5-90 parts by mass). This parameter change transforms the matrix from a polymer-based system to a hydrocarbon oil-based system, which inherently provides better moisture permeability and faster discoloration response while maintaining structural integrity through the combination with saturated fatty acids and colorant composition.
2Object-affected harmful factors
If conventional thermoplastic resin compositions are used, then the material stability is ensured, but unpleasant odors are generated and transferred to absorbent articles
Solution Approach 1:
The patent creates a composite material system combining hydrocarbon oils (A) with saturated fatty acids (B) and wet-sensitive colorant composition (C). This composite approach allows the hydrocarbon oil to provide low odor characteristics while the saturated fatty acids and colorant composition maintain material stability and functional performance. The synergistic combination resolves the contradiction between odor reduction and stability maintenance.
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 exhibits excellent discoloration performance with clear and rapid color change, while minimizing odor, thus accurately indicating a wet state and improving user comfort.
Implementation Method 1
The wet indicator composition changes color in response to pH change
Implementation Method 2
permeability of moisture is not sufficiently excellent
Implementation Method 3
a leuco dye and a color-developing agent in a hot melt adhesive matrix
Data Source
AI summary
To provide a composition for wet indicator which is excellent in discoloration performance and is suppressed in odor. What is disclosed is a composition for wet indicator comprising: a hydrocarbon oil (A), at least one selected from saturated fatty acids having 16 or more carbon atoms and derivatives thereof (B), and a wet-sensitive colorant composition (C), wherein the component (B) is contained in an amount of 2 to 85 parts by mass based on 100 parts by mass of the total amount of the components (A) to (C).