Biaxially Oriented Polyester Film With Antimony-Reduced Catalyst System
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing biaxially oriented polyester films contain high levels of antimony, which is carcinogenic, and have issues with foreign substances and defects, affecting transparency, heat resistance, and printability.
Innovation Solution
A biaxially oriented polyester film with a content of antimony of 10 ppm or less, phosphorus between 25 to 75 ppm, intrinsic viscosity of 0.51 to 0.70 dl/g, and fewer defects than 1 per 1000 square meters, using aluminum and phosphorus compounds as catalysts and controlling stretching and heat treatment processes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If antimony catalyst is used in polyester production, then polymerization efficiency is improved, but the film contains carcinogenic antimony and fails hygiene requirements
Solution Approach 1:
The patent removes the harmful antimony catalyst from the polyester production process entirely, replacing it with alternative catalyst systems that do not introduce carcinogenic substances into the final film product
Solution Approach 2:
The patent introduces alternative catalysts (such as zinc compounds, aluminum compounds, or titanium compounds) as intermediary substances to facilitate polymerization without the harmful effects of antimony, acting as a mediator between the need for efficient polymerization and the requirement for hygiene safety
2Ease of manufacture
If conventional polyester production methods are used, then manufacturing cost is reduced, but the film contains excessive foreign substances and defects
Solution Approach 1:
The patent modifies production parameters including catalyst type and concentration, polymerization temperature, and extrusion conditions to reduce foreign substance formation while maintaining cost-effectiveness through optimized process conditions
Solution Approach 2:
The patent implements preliminary filtration steps and controlled cooling processes during film production to prevent foreign substance formation before they become defects in the final product
3Manufacturing precision
If film transparency is improved by reducing defects, then printability is enhanced, but manufacturing complexity increases
Solution Approach 1:
The patent focuses quality control efforts on specific critical areas of the production process such as the melt filtration zone and the film formation zone, applying enhanced control only where it most impacts transparency rather than uniformly across the entire process
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 low antimony content, reduced foreign substances, excellent transparency, heat resistance, and improved printability, suitable for packaging and industrial applications.
Implementation Method 1
a polyester raw material containing at least one selected from aluminum compounds and at least one selected from phosphorus compounds as polymerization catalysts
Implementation Method 2
biaxially oriented polyester film
Implementation Method 3
excellent in transparency and heat resistance
Data Source
AI summary
To provide a biaxially oriented polyester film that has extremely low content of antimony, excellent hygiene, few foreign substances, excellent transparency and heat resistance, and is excellent in printability, workability, and productivity. A biaxially oriented polyester film characterized by a content of antimony in the film of 10 ppm or less, a content of phosphorus in the film of 25 ppm or more and 75 ppm or less, an intrinsic viscosity of the film of 0.51 dl/g or more and 0.70 dl/g or less, and a number of defects with a size of 1 mm or more is 1.0 or less per 1000 square meters of the film.