Biaxially Stretched Polyester Film Antimony Control
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Solution Overview
Problem
Biaxially stretched polyester films used in optical applications face challenges in achieving both excellent adhesiveness with adjacent layers and transparency, as excessive antimony metal particles can degrade transparency, while insufficient antimony content impairs adhesion and crystal growth.
Innovation Solution
A biaxially stretched polyester film is produced with a controlled amount of metal antimony, within a specific range, along with magnesium and phosphorus compounds, to optimize adhesiveness and transparency, using a method involving esterification and polycondensation reactions followed by biaxial stretching.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If the amount of antimony metal particles is increased to improve adhesiveness with adjacent layers, then adhesion is enhanced, but transparency deteriorates
Solution Approach 1:
The patent applies parameter changes by precisely controlling the amount of antimony metal particles within a specific range (greater than or equal to 1 mg/kg and less than or equal to 100 mg/kg of polyester). This quantitative parameter optimization resolves the contradiction by finding the optimal balance point where adhesiveness is sufficient while transparency is maintained, preventing both deficiency and excess of antimony particles.
2Illumination intensity
If the amount of antimony metal particles is decreased to improve transparency, then optical properties are enhanced, but adhesiveness and crystal growth are impaired
Solution Approach 1:
The patent establishes a minimum threshold parameter (greater than or equal to 1 mg/kg) for antimony metal particle content to ensure that transparency is optimized while adhesiveness and crystal growth requirements are maintained. This parameter setting prevents the transparency improvement from compromising the mechanical and adhesive properties.
3Stability of the object's composition
If the amount of antimony metal particles is increased to promote crystal growth, then crystallization is enhanced, but transparency deteriorates
Solution Approach 1:
The patent applies parameter changes by setting an upper limit (less than or equal to 100 mg/kg) for antimony metal particle content. This parameter control ensures that crystal growth is sufficiently promoted while preventing excessive antimony accumulation that would cause transparency deterioration, thus optimizing the balance between crystallization and optical properties.
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 achieves excellent adhesiveness with adjacent layers and maintains high transparency by balancing antimony content, ensuring proper crystal growth and optical properties.
Implementation Method 1
an antimony compound is used as a polycondensation catalyst performing a polycondensation reaction between a dicarboxylic acid component and a diol component
Implementation Method 2
antimony oxide which is a catalyst is reduced by carbon monoxide (CO) which is reducing gas generated due to thermal decomposition of ethylene glycol (hereinafter, referred to as EG), and is educed in polyester as metal antimony
Implementation Method 3
carbon monoxide (CO) which is reducing gas generated due to thermal decomposition of ethylene glycol
Implementation Method 4
the amount of antimony in the residues on a membrane filter having an average pore diameter of 0.1 μm after a solution in which parachlorophenol and tetrachloroethane are dissolved in a solvent at a ratio of 75:25 (a weight ratio) is filtered by the membrane filter
Data Source
AI summary
Disclosed is a biaxially stretched polyester film containing an antimony compound as a catalyst component, and a magnesium compound and a phosphorus compound as additives, in which an amount of metal antimony included in residues on a membrane filter having an average pore diameter of 0.1 μm, after a solution in which 1 g of the biaxially stretched polyester is dissolved in 5 ml of hexafluoroisopropanol is filtered by the filter, is 10 to 100 mg per 1 kg of the biaxially stretched polyester.