Ionic Acetal PVA Polymer for Low-Color Water Solubility
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Solution Overview
Problem
Polyvinyl alcohol (PVA) polymers with ionic groups face issues such as color development and formation of water-insoluble matter, leading to reduced water solubility and dispersibility, especially when high degrees of saponification are not maintained.
Innovation Solution
Introduce an acetal skeleton with an ionic group into the PVA polymer under controlled reaction conditions, using specific carbonyl compounds like glyoxylic acid or formylbenzoic acid, to minimize color development and insoluble matter, maintaining a degree of saponification of 70 mol% or less.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If ionic groups are introduced into PVA to improve water solubility and dispersibility, then hydrophilicity is greatly improved, but color development and formation of water-insoluble matter occur
Solution Approach 1:
The patent changes the chemical structure parameter by introducing acetal skeletons with ionic groups instead of direct ionic group attachment. This structural modification allows the PVA to maintain water solubility while reducing color development and insoluble matter formation during the modification process
Solution Approach 2:
The patent converts the potentially harmful direct attachment of ionic groups (which causes color development) into a beneficial acetal skeleton structure. The acetal skeleton acts as a protective framework that delivers the hydrophilic benefits of ionic groups while minimizing the harmful side effects of coloration and insolubility
2Stability of the object's composition
If heating is performed under conditions that allow for complete melting of PVA to achieve uniform mixing, then mixing uniformity is improved, but color development increases and water solubility decreases
Solution Approach 1:
The patent changes the reaction parameter from high-temperature melting conditions to lower temperature conditions enabled by the acetal skeleton structure. This allows sufficient mixing uniformity to be achieved without the excessive heat that causes color development and loss of water solubility
3Adaptability or versatility
If PVA with low degree of saponification is modified to impart water solubility, then water dispersibility is improved, but the PVA becomes prone to color development and insoluble matter formation
Solution Approach 1:
The patent changes the modification approach for low saponification PVA by using acetal skeleton formation with ionic groups. This alternative modification pathway achieves water dispersibility without the color development and insoluble matter problems that plague conventional modification methods for low saponification PVAs
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 resulting PVA polymer exhibits improved water solubility and dispersibility with reduced color development and insoluble fractions, even at low saponification levels, ensuring homogeneous ionic group introduction and efficient functional exhibition.
Implementation Method 1
a heating step comprising heating a composition (for example, in a solid form or a molten state) comprising a polyvinyl alcohol-based polymer (B) and a carbonyl compound having an ionic group
Data Source
AI summary
A polyvinyl alcohol-based polymer and others are provided. The polyvinyl alcohol-based polymer has an acetal skeleton having an ionic group and satisfies at least one requirement selected from the following (1), (2) and (3): (1) a 4% by mass solution of the polyvinyl alcohol-based polymer in dimethyl sulfoxide has a YI value of 10 or less, (2) a 4% by mass aqueous solution of the polyvinyl alcohol-based polymer has a transparency of 2% or more at 430 nm at 20°C, and (3) the polyvinyl alcohol-based polymer has a water-insoluble fraction of 20% by mass or less.