Polymer Composition Haze Control via Alkali Metal Halide Reduction
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Solution Overview
Problem
Polymer compositions prepared using the chloro-displacement process exhibit higher haze levels, detracting from their commercial attractiveness due to unacceptable optical clarity, which is critical in applications requiring both heat resistance and low haze.
Innovation Solution
Reducing the level of alkali metal halide in the polymer composition to less than 25 parts per million prior to forming an article, thereby controlling haze and achieving acceptable optical quality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If the chloro-displacement process is used to prepare polyetherimide compositions, then process simplicity and compositional flexibility are improved, but haze levels increase to unacceptable levels
Solution Approach 1:
The invention changes the chemical parameters of the polymer composition by limiting alkali metal halide content to less than 25 parts per million. This parameter control resolves the contradiction by enabling the chloro-displacement process to produce articles with acceptable haze levels (less than or equal to 10%), thus maintaining both process simplicity and manufacturing precision.
2Temperature
If polymer compositions with high heat resistance are used, then thermal performance is improved, but haze levels become unacceptable
Solution Approach 1:
The invention changes the compositional parameters by strictly controlling alkali metal halide content to less than 25 parts per million in the polymer composition. This enables heat-resistant polymers like polyetherimide to achieve both their thermal performance and acceptable optical clarity (haze less than or equal to 10%), resolving the contradiction between heat resistance and haze level.
3Adaptability or versatility
If alkali metal halide content is not controlled in the polymer composition, then manufacturing flexibility is maintained, but optical clarity deteriorates
Solution Approach 1:
The invention establishes a specific parameter threshold (alkali metal halide content less than 25 parts per million) that maintains manufacturing flexibility while ensuring optical clarity. This controlled parameter approach allows continued use of the chloro-displacement process and various polymer compositions while achieving acceptable haze levels (less than or equal to 10%).
Data Source
AI summary
A method for controlling haze in an article comprising a polymer composition, said method comprising providing a polymer composition comprising less than 25 parts per million alkali metal halide; and fabricating an article from said polymer composition.