Non-tacky Wetness Indicator Composition for Polymeric Substrates
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Solution Overview
Problem
Existing color-developing indicators for polymeric substrates are tacky, making them unsuitable for absorbent articles and requiring a composition that is non-leachable, durable, and exhibits a clear color change when exposed to an aqueous solution.
Innovation Solution
A color-developing composition comprising a leuco dye, an electron-withdrawing color-developer agent, and a desensitizer, dissolved in a volatile organic solvent medium, which changes from a colorless to a vibrant color upon exposure to an aqueous solution, with optional binders for printing and adhesion.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional color-developing indicators are applied to polymeric substrates, then color change functionality is achieved, but the composition remains tacky and unsuitable for absorbent articles
Solution Approach 1:
The patent changes the chemical composition parameters by introducing a desensitizer component that modifies the interaction between the color-developing composition and the polymeric substrate. This parameter change eliminates tackiness while preserving color change functionality, making the composition suitable for absorbent articles.
Solution Approach 2:
The patent creates a composite material system combining leuco dye, color developer, and desensitizer components. This composite approach allows the desensitizer to counteract the tacky properties of the color-developing agents while maintaining the color change response to moisture, resolving the contradiction between functionality and harmful tackiness.
2Reliability
If color-developing composition is applied to polymeric substrates, then moisture detection is enabled, but the composition may be leachable and lack durability
Solution Approach 1:
The patent modifies the chemical parameters of the composition by selecting specific desensitizer molecules that enhance binding affinity to the polymeric substrate. This parameter optimization reduces leachability while maintaining moisture detection capability, addressing the durability concern.
3Ease of manufacture
If existing color indicators are used, then color change is achieved, but the composition does not exhibit low tack required for manufacturing
Solution Approach 1:
The patent changes the compositional parameters by incorporating desensitizer at optimized concentrations that eliminate tackiness. This parameter adjustment makes the composition suitable for conventional printing techniques and absorbent article manufacturing, directly improving ease of manufacture.
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 low tack, is non-leachable, and provides a visually distinct color change upon wetting, suitable for use in absorbent articles and applied using conventional printing techniques.
Implementation Method 1
a complex formed from a leuco dye, a electron-withdrawing color-developer agent, and a separator, where said leuco dye and color-developer are capable of interacting to manifest color when said separator dissolves or disperses in the presence of an aqueous solution
Implementation Method 2
a color-developing composition comprising a leuco dye, an electron-withdrawing color-developer agent, and a desensitizer, dissolved in a volatile organic solvent medium
Data Source
Figure 1A~1B
Figure 2
Figure 3
AI summary
The invention describes a color-developing composition that contains at least three major components: (1) a leuco dye or a combination of leuco dyes, (2) an color-developer or a combination of color-developers that can form colored complexes with the leuco dyes, and (3) a desensitizer to temporarily remove the effect of the developer so the leuco dye appears in its colorless form. An optional binder may be included so that the composition may be applied to a substrate as an ink. The ink composition may be applied to synthetic polymeric substrates and other substrates that are incorporated into absorbent articles or personal care products.