Cellulose Triacetate Film with Purified Polyester Plasticizer
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Solution Overview
Problem
Existing cellulose resin compositions face issues with roll contamination during processing and reduced productivity due to vaporization and film yield reduction, which are not adequately addressed by current polyester-based plasticizers.
Innovation Solution
A cellulose resin composition is developed with a polyester-based plasticizer having components with a molecular weight of 430 or less removed to 1.5 wt% or less by thin-film distillation, and used in an amount of 3 to 50 parts by mass with respect to 100 parts of cellulose resin, specifically utilizing cellulose triacetate with a polymerization degree of 250 to 400 and an average acetylation degree of 54.0 to 62.5%, along with a dehydration-condensation reaction using a polybasic acid and polyhydric alcohol.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If conventional plasticizers are used to lower the softening point of cellulose resin, then the resin becomes processable, but roll contamination occurs during processing due to vaporization
Solution Approach 1:
The invention changes the molecular weight parameter of the plasticizer by removing low molecular weight components (430 or less) through thin-film distillation, reducing their content to 1.5 wt% or less. This parameter change eliminates vaporization during processing while maintaining plasticizing effectiveness, thereby preventing roll contamination.
Solution Approach 2:
The invention extracts and removes the harmful low molecular weight components (molecular weight 430 or less) from the plasticizer through thin-film distillation. By taking out these specific components that cause vaporization and roll contamination, the plasticizer retains its plasticizing function without the harmful effects.
2Ease of manufacture
If conventional plasticizers are used, then the softening point is lowered, but productivity decreases due to film yield reduction
Solution Approach 1:
The invention changes the molecular weight distribution parameter of the plasticizer by removing low molecular weight components. This results in a plasticizer with higher molecular weight components that provide effective plasticizing while preventing film yield reduction, thereby maintaining both processability and productivity.
3Stability of the object's composition
If polyester-based plasticizers are used, then compatibility with cellulose resin is improved, but low molecular weight components cause vaporization and roll contamination
Solution Approach 1:
The invention changes the molecular weight parameter of the polyester-based plasticizer by removing components with molecular weight 430 or less through thin-film distillation, reducing their content to 1.5 wt% or less. This eliminates vaporization while preserving the compatibility provided by the polyester structure.
Solution Approach 2:
The invention extracts the harmful low molecular weight components from the polyester-based plasticizer, separating the beneficial high molecular weight components (which provide compatibility) from the harmful low molecular weight components (which cause vaporization).
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
This composition inhibits roll contamination and productivity reduction, enabling its use in applications like polarizing plates and protective films with improved properties such as compatibility, stability, and water resistance.
Implementation Method 1
components having a molecular weight of 430 or less are removed to an amount of 1.5 wt% or less by thin-film distillation
Implementation Method 2
a dehydration-condensation reaction using a polybasic acid, a polyhydric alcohol and, as required, a stopper
Data Source
AI summary
Provided is a cellulose resin composition wherein roll contamination during processing and reduction in the productivity caused by roll contamination are inhibited. The cellulose resin composition is obtained by adding a polyester-based plasticizer to a cellulose resin, the cellulose resin composition being characterized in that the polyester-based plasticizer is produced from a polybasic acid, a polyhydric acid and, as required, a stopper, in which polyester-based plasticizer, components having a molecular weight of 430 or less are removed to an amount of 5 wt% or less.