Water-Soluble Unit Dose Film Composition for Cold-Wash Dissolution
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Solution Overview
Problem
Water-soluble unit dose articles made with traditional polyvinyl alcohol films face issues of incomplete dissolution during short and cold wash cycles, leading to undissolved film material depositing on washed articles, and seal failures between films result in premature rupture.
Innovation Solution
A water-soluble unit dose article comprising multiple compartments sealed with a homogeneous solvent sealing solution, using a blend of polyvinyl alcohol polymers with specific ratios and types of carboxylated anionic monomer units, and applying the sealing solution with absorbent materials to enhance film integrity and dissolution.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If traditional polyvinyl alcohol films are used, then the film provides sufficient strength during storage and transport, but the film does not dissolve completely during short and cold wash cycles
Solution Approach 1:
The patent modifies the chemical composition parameters of the polyvinyl alcohol film by incorporating carboxylated anionic monomer units (such as carboxymethyl groups) into the polymer structure. This chemical parameter change enhances the film's interaction with water, enabling complete dissolution during short and cold wash cycles while preserving adequate structural integrity for storage and transport.
Solution Approach 2:
The patent creates a composite polyvinyl alcohol material by combining traditional PVOH chains with carboxylated anionic monomer units. This composite structure integrates the strength properties of conventional PVOH with the enhanced water solubility provided by the carboxylated groups, achieving both reliable structural integrity and complete dissolution under various wash conditions.
2Strength
If polyvinyl alcohol film is used, then the film maintains structural integrity, but seal failures occur resulting in premature rupture
Solution Approach 1:
The patent alters the chemical parameters of the polyvinyl alcohol film by introducing carboxylated anionic monomer units, which modify the intermolecular forces and bonding characteristics. This parameter change enhances the seal integrity by improving the adhesion between sealed regions while maintaining the overall film strength required for structural integrity during storage and handling.
3Productivity
If the film dissolves quickly, then complete dissolution is achieved, but film structural integrity is compromised
Solution Approach 1:
The patent optimizes the chemical composition parameters of the polyvinyl alcohol film by incorporating carboxylated anionic monomer units at controlled concentrations. This parameter optimization enables the film to dissolve completely during short and cold wash cycles (enhancing dissolution speed) while the base PVOH structure maintains sufficient structural integrity for storage and transport.
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 solution reduces seal failures and ensures complete dissolution of the film under short and cold wash conditions, maintaining structural integrity and minimizing film residues.
Implementation Method 1
sealed together with a homogeneous solvent sealing solution
Implementation Method 2
applying the sealing solution with absorbent materials to enhance film integrity and dissolution
Implementation Method 3
when the water-soluble unit dose article is added to water, the film dissolves/disintegrates releasing the internal contents into the surrounding water to create a wash liquor
Data Source
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AI summary
Water-soluble films, water-soluble unit dose articles, and related methods of making and using the same.