Modified Polyvinyl Alcohol Particles for Gelation-Free Dissolution
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Solution Overview
Problem
Modified polyvinyl alcohols with low vinyl alcohol unit content tend to gelate during dissolution, reducing water solubility and requiring prolonged treatment at elevated temperatures, and have low affinity for photosensitive monomers.
Innovation Solution
Particles containing modified polyvinyl alcohol with a specific range of vinyl alcohol units (60-90 mol%) and a particular average particle size (300-1000 µm) that are crosslinkable by high-energy beams, inhibiting self-crosslinking and promoting high water solubility and affinity for photosensitive monomers.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If the content of vinyl alcohol units is reduced to increase photosensitivity, then the amount of photosensitive moieties per unit weight increases, but the modified polyvinyl alcohol tends to gelate during dissolution, reducing water solubility
Solution Approach 1:
The patent applies parameter changes by precisely controlling the vinyl alcohol unit content within 60-90 mol% and the particle size within 300-1000 µm. This optimization balances the concentration of photosensitive moieties while preventing gelation during dissolution, thereby maintaining water solubility despite increased photosensitive content
Solution Approach 2:
The patent implements preliminary action by pre-controlling the particle size of modified polyvinyl alcohol within 300-1000 µm before dissolution. This preliminary size control prevents excessive heat generation and self-crosslinking during the subsequent dissolution process, thereby preventing gelation and ensuring water solubility is maintained
2Quantity of substance
If the content of vinyl alcohol units is reduced to increase photosensitivity, then more photosensitive moieties can be introduced, but prolonged treatment at elevated temperatures is required, reducing productivity
Solution Approach 1:
The patent optimizes parameters by controlling vinyl alcohol unit content at 60-90 mol% and particle size at 300-1000 µm, enabling rapid dissolution at room temperature or with minimal heating. This eliminates the need for prolonged elevated temperature treatment and significantly improves productivity
Solution Approach 2:
The patent performs preliminary particle size reduction to 300-1000 µm before dissolution. This preliminary action increases the surface area to volume ratio, accelerating dissolution kinetics and enabling quick dissolution without prolonged heating, thereby improving productivity
3Quantity of substance
If the content of vinyl alcohol units is reduced to increase photosensitivity, then more photosensitive moieties can be introduced, but affinity for photosensitive monomers decreases
Solution Approach 1:
The patent applies parameter changes by optimizing vinyl alcohol unit content within 60-90 mol%, which maintains sufficient polarity and hydrogen bonding capability. This optimized range preserves strong affinity for photosensitive monomers while still allowing high concentration of photosensitive moieties to be introduced
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 particles exhibit high water solubility, inhibit gelation during dissolution, and maintain high affinity for photosensitive monomers, enabling efficient preparation of aqueous solutions without prolonged treatment.
Implementation Method 1
An olefin, which is a reactive functional group, can be introduced into a side chain of a vinyl alcohol-based polymer to allow for making the polymer water-resistant by high-energy beam crosslinking
Data Source
AI summary
The invention relates to particles with an average particle size of 300 to 1000 µm, comprising a modified polyvinyl alcohol having vinyl alcohol units and structural units represented by formula (1), wherein a content of the vinyl alcohol units is 60 to 90 mol% based on the total structural units: wherein R1 represents a hydrogen atom or a methyl group. Thus, the present invention provides particles containing a modified polyvinyl alcohol having high water solubility and high affinity for a photosensitive monomer, which are highly photosensitive.