Water-Soluble PVA Film Composition for Fast Cold-Water Dissolution
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Solution Overview
Problem
Existing polyvinyl alcohol films struggle to balance fast solubility and mechanical properties, particularly in applications requiring rapid dissolution in cold water without stirring or hot water use, such as cosmetic packaging.
Innovation Solution
A water-soluble film containing a polyvinyl alcohol resin with a plasticizer comprising a polyhydric alcohol with a melting point of 80°C or higher, specifically xylitol, in an amount of 30 parts by mass or less per 100 parts by mass of the resin, along with optional additional polyhydric alcohols, achieves a balance between fast solubility and mechanical properties.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If a large amount of plasticizer is added to improve fast solubility, then the film dissolves quickly in water, but the mechanical properties deteriorate
Solution Approach 1:
The patent changes the chemical composition parameters of the plasticizer by specifying that it must contain xylitol in an amount of 20% by mass or more. This compositional parameter change allows achieving fast solubility with a controlled plasticizer amount (30 parts by mass or less per 100 parts by mass of polyvinyl alcohol resin), thereby maintaining mechanical properties while improving dissolution speed.
2Speed
If plasticizer amount is increased to improve solubility, then the film dissolves faster, but sealability worsens
Solution Approach 1:
The patent specifies precise compositional parameters for the plasticizer (containing xylitol at 20% by mass or more) and controls the plasticizer amount (30 parts by mass or less per 100 parts by mass of resin). These parameter changes enable achieving fast solubility while maintaining excellent sealability, as the specific composition provides balanced performance.
3Strength
If conventional plasticizers are used to maintain mechanical properties, then the film remains strong, but solubility speed worsens
Solution Approach 1:
The patent changes the chemical composition of the plasticizer from conventional options to one containing xylitol in an amount of 20% by mass or more. This compositional parameter change fundamentally alters the plasticizer's interaction with polyvinyl alcohol resin, enabling both fast solubility and maintained mechanical properties with a controlled amount (30 parts by mass or less per 100 parts by mass of resin).
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 film exhibits excellent solubility and sealability, maintaining mechanical integrity while dissolving quickly in cold water, suitable for cosmetic packaging.
Implementation Method 1
the plasticizer (B) contains a polyhydric alcohol (b1) with a melting point of 80° C. or higher, and the polyhydric alcohol (b1) contains xylitol in an amount of 20% by mass or more
Data Source
AI summary
A water-soluble film having an excellent balance between fast solubility and mechanical properties as well as excellent sealability is provided as follows. A water-soluble film contains a polyvinyl alcohol resin (A) and a plasticizer (B). The plasticizer (B) is present in an amount of 30 parts by mass or less per 100 parts by mass of the polyvinyl alcohol resin (A). The plasticizer (B) contains a polyhydric alcohol (b1) with a melting point of 80° C. or higher. The polyhydric alcohol (b1) contains xylitol in an amount of 20% by mass or more.