Polyester Laminated Film Antistatic Agent Transfer Control
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Solution Overview
Problem
Existing polyester films with antistatic coatings face issues of antistatic agent transfer to the rear surface, leading to deteriorated printing properties and adhesive defects, particularly in post-processing and electronic material applications, where high adhesive force and controlled electrification are required.
Innovation Solution
A polyester laminated film with a good-adhesive coating layer and an antistatic coating layer, where the antistatic agent is transferred to the good-adhesive layer under controlled conditions (40° C. for 3 days under 50 kgf/cm2), ensuring a surface resistance difference of 1×104 or more, thereby preventing agent transfer to the rear surface and maintaining excellent adhesive and antistatic properties.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If an antistatic coating layer is applied on the polyester film surface, then antistatic performance is improved, but the antistatic agent transfers to the rear surface causing deteriorated printing properties and adhesive defects
Solution Approach 1:
A release coating layer is introduced as an intermediary between the antistatic coating layer and the polyester base film. This release layer prevents the antistatic agent from transferring to the rear surface (printing surface) while allowing controlled transfer to maintain antistatic performance. The release coating acts as a barrier that mediates the interaction between the antistatic layer and the substrate, solving the contradiction by blocking harmful transfer while preserving necessary functionality.
Solution Approach 2:
The coating structure is segmented into distinct functional layers: an antistatic coating layer containing the antistatic agent, a release coating layer in between, and a polyester base film. This segmentation separates the antistatic function from the printing surface, preventing contamination while maintaining effectiveness. The release layer segment acts as a protective barrier that isolates the printing surface from the antistatic agent.
2Reliability
If a conductive polymer or metal oxide is used for antistatic treatment, then excellent antistatic function is achieved, but manufacturing cost is excessively high and solid content is excessively small
Solution Approach 1:
The invention changes the chemical composition parameters of the antistatic agent from expensive conductive polymers or metal oxides to cheaper alternatives such as quaternary ammonium salts or other ionic compounds. By adjusting the chemical parameters while maintaining the coating structure with a release layer, the invention achieves comparable antistatic functionality at lower cost with higher solid content, improving manufacturing economics.
Solution Approach 2:
The invention replaces expensive, long-lasting conductive materials with cheaper antistatic agents that can be applied in lower concentrations. The release coating layer enables the use of these less expensive materials by preventing their transfer to the printing surface, allowing cost-effective antistatic treatment without sacrificing performance.
3Ease of manufacture
If an anionic or cationic antistatic agent is applied to the polyester film surface, then relatively excellent antistatic effect is achieved with low manufacturing cost, but aging characteristics deteriorate due to movement of the antistatic agent on the surface
Solution Approach 1:
The release coating layer serves as a mediator that restricts the movement of the anionic or cationic antistatic agent on the film surface. By introducing this intermediate layer, the antistatic agent is confined to its intended location and prevented from migrating during storage and use, thereby improving aging characteristics while maintaining the cost advantage of using these economical antistatic compounds.
Solution Approach 2:
The release coating layer is applied beforehand to cushion or prevent the harmful effect of antistatic agent migration. This protective layer is in place before the antistatic agent can move, preventing aging-related deterioration from the outset while allowing the use of cost-effective ionic antistatic agents.
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 high transparency, excellent adhesive properties with post-processing materials, and effective antistatic performance, preventing agent transfer and maintaining physical properties, thus suitable for various industries including electronics, with improved printing and anti-blocking performance.
Implementation Method 1
after back-side transfer is performed on the antistatic coating layer and the good-adhesive coating layer at 40° C. for 3 days (40° C./3 day) under a load of 50 kgf/cm2
Implementation Method 2
after back-side transfer is performed on the antistatic coating layer and the good-adhesive coating layer at 40° C. for 3 days (40° C./3 day) under a load of 50 kgf/cm2
Implementation Method 3
surface resistance A of the good-adhesive coating layer and surface resistance B of the antistatic coating layer satisfy the following Equation 1: 1×104≦A−B
Data Source
AI summary
Provided is a polyester laminated film having a double-sided heterogeneous coating layer, and more particularly, a polyester laminated film having an excellent antistatic property and post-processability.