N-Substituted P-Menthane Carboxamide Cooling Agents in Absorbent Articles
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Solution Overview
Problem
Existing absorbent articles face challenges in providing a stable and effective cooling sensation due to the volatility of conventional cooling agents, which leads to instability during shipment and storage, and can be unpleasant for wearers due to odor issues.
Innovation Solution
Incorporating N-substituted p-menthane carboxamide cooling agents with lower volatility, such as N-(4-cyanomethylphenyl) p-ethanecarboxamide, into a lotion composition for absorbent articles, which are odorless or have a faint odor, and have an enthalpy of vaporization of at least 71 kJ/mol, ensuring stability and effective skin delivery.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If conventional cooling agents (menthol lactate, WS-3) are used in absorbent articles, then a cooling sensation is provided, but the materials become unstable during shipment and storage due to high volatility
Solution Approach 1:
The patent changes the physical-chemical parameters of the cooling agent by selecting N-substituted p-menthane carboxamides with specific enthalpy of vaporization values (at least 71 kJ/mol at 101.325 kPa). This parameter change reduces volatility while maintaining the cooling sensation, thereby resolving the contradiction between providing cooling and maintaining stability during storage and shipment.
2Temperature
If conventional cooling agents are used to provide cooling sensation, then skin cooling is achieved, but unpleasant odor is generated that can be unacceptable to wearers
Solution Approach 1:
The patent changes the chemical structure and physical properties of the cooling agent by selecting specific N-substituted p-menthane carboxamide compounds that are odorless or have faint odor. This parameter change maintains the cooling sensation while eliminating the unpleasant odor associated with conventional cooling agents.
3Stability of the object's composition
If lower volatility cooling agents are used to improve stability, then shipment and storage stability is improved, but delivery to epidermal cooling receptors becomes problematic
Solution Approach 1:
The patent uses a lotion composition as an intermediary carrier that facilitates the delivery of N-substituted p-menthane carboxamide cooling agents to the skin. The lotion composition acts as a medium that enables effective transfer of the cooling agent to epidermal cooling receptors while maintaining the stability benefits of the lower volatility compound.
4Temperature
If cooling agents are loaded into the core of the product to reach sensory receptors, then cooling sensation is provided, but the volatile materials remain unstable upon shipment and storage
Solution Approach 1:
The patent changes the volatility parameter of the cooling agent by selecting N-substituted p-menthane carboxamides with enthalpy of vaporization of at least 71 kJ/mol. This parameter change allows the cooling agent to be placed in the core of the absorbent article while maintaining stability during shipment and storage, as the lower volatility prevents excessive evaporation.
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 use of N-substituted p-menthane carboxamide cooling agents in absorbent articles provides a stable and pleasant cooling sensation to the skin, overcoming volatility and odor concerns, while maintaining product stability during storage and shipment.
Implementation Method 1
a cooling agent comprising a N-substituted p-menthane carboxamide material selected from the group consisting of N-(4-cyanomethylphenyl) p-enthanecarboxamide, N-(4-sulfamoylphenyl) p-menthanecarboxamide, N-(4-cyanophenyl) p-enthanecarboxamide, N-(4-acetylphenyl) p-menthanecarboxamide, N-(4-hydroxymethylphenyl) p-menthanecarboxamide, N-(3-hydroxy-4-methoxyphenyl) p- menthanecarboxamide, and mixtures thereof
Implementation Method 2
the cooling agent having an enthalpy of vaporization of at least 71 kJ/mol at 101.325 kPa (760 Torr)
Data Source
AI summary
An absorbent article comprises a lotion composition comprising a particular cooling agent. In one embodiment, the cooling agent comprises a particular N-substituted p-menthane carboxamide material. In another embodiment, the cooling agent comprises a cooling material having an enthalpy of vaporization of at least 71 kJ/mol at 760 Torr. The absorbent articles comprising the particular cooling agents provide a cooling sensation to the skin of the wearer of the absorbent article.