Porous Multilayer Dissolvable Sheets With Surfactant Interlayer Coating
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Solution Overview
Problem
Multilayer dissolvable sheets experience slower dissolution rates and gelling issues due to the presence of water-soluble polymers and surfactants, leading to incomplete dissolution and residue formation, especially in stringent washing conditions.
Innovation Solution
Applying a coating composition containing a second surfactant on the contacting surfaces of adjacent layers of flexible, porous dissolvable sheets, ensuring the coating is not on the outer surfaces, to enhance dissolution.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If multiple layers of flexible dissolvable sheets are assembled into a unitary article, then the surfactant delivery capacity is improved, but the dissolution rate significantly decreases
Solution Approach 1:
A coating composition comprising a second surfactant is applied to the contacting surfaces between adjacent layers of the multilayer sheets. This intermediary coating acts as a mediator that prevents gelling between layers while maintaining the multilayer structure's surfactant delivery capacity, thereby resolving the contradiction between quantity of surfactant and dissolution rate.
2Quantity of substance
If multiple layers of flexible dissolvable sheets are assembled into a unitary article, then the surfactant delivery capacity is improved, but gelling occurs preventing water penetration
Solution Approach 1:
The coating composition serves as an intermediary substance applied between adjacent layers. This coating prevents direct contact and gelling between the water-soluble polymers and surfactants of adjacent layers, eliminating the harmful gelling effect while preserving the multilayer structure's ability to deliver surfactants.
Solution Approach 2:
The coating composition changes the surface properties of the contacting surfaces between layers. By modifying the surface parameters with a second surfactant, the coating prevents the gelation that would otherwise occur when water penetrates the multilayer structure, thus eliminating the harmful gelling effect.
3Quantity of substance
If multiple layers of flexible dissolvable sheets are assembled into a unitary article, then the surfactant delivery capacity is improved, but incomplete dissolution and residue formation occur under stringent washing conditions
Solution Approach 1:
The coating composition acts as a protective intermediary layer between adjacent sheets. This coating ensures that each layer dissolves completely and independently even under stringent washing conditions, preventing the formation of undissolved residues while maintaining the enhanced surfactant delivery capacity of the multilayer structure.
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 coating composition significantly improves the dissolution profile of multilayer structures by maintaining porosity and preventing gelling, ensuring complete dissolution without residues.
Implementation Method 1
wherein the coating composition comprises a second surfactant
Implementation Method 2
porous sheets with open-celled foam (OCF) structures characterized by a Percent Open Cell Content of from about 80% to 100%
Data Source
AI summary
This present invention provides dissolvable solid articles comprising multiple layers of flexible, dissolvable, porous sheets, in which a coating composition is present on at least one internal surface of at least one sheet in said solid articles. The present invention also provides a process for making such solid articles.