White Polyester Film Coating Balancing Antistatic and Ink Adhesion
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Solution Overview
Problem
Existing polyester films face challenges in achieving both antistatic properties and sufficient adhesion to inks and toners, particularly with UV-curable inks during high-speed printing, due to issues with electrostatic charge and the use of conductive additives that can compromise adhesion and film quality.
Innovation Solution
A readily adhesive white polyester film with a coating layer containing a cationic antistatic agent, polyester resin, and polyurethane resin, where the nitrogen content and polyurethane resin proportion are optimized to achieve a contact angle of 50° to 70°, ensuring effective antistatic properties and adhesion to inks and toners.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If conductive additives (metal powders, metal oxides, conductive fillers) are incorporated into the coating layer to impart antistatic properties, then electrostatic charge is reduced, but adhesion to inks and toners becomes insufficient and film quality deteriorates
Solution Approach 1:
The patent changes the chemical composition parameters of the coating layer by using specific resin combinations (polyester resin with polyol containing hydroxyl groups, polyurethane resin with isocyanate groups) and controlling their ratios, along with adding antistatic agents in optimized amounts, to achieve both antistatic properties and adhesion without relying on conductive fillers
Solution Approach 2:
The patent creates a composite coating layer system combining multiple resin components (polyester resin, polyurethane resin), antistatic agents, and optional crosslinking agents to achieve synergistic effects that provide both antistatic properties and adhesion to inks and toners
2Object-affected harmful factors
If large amounts of conductive substances are added to achieve sufficient antistatic effects, then electrostatic charge is reduced, but adhesion to inks and toners becomes insufficient and film cost increases
Solution Approach 1:
The patent optimizes the concentration parameters by limiting conductive fillers to 1-50 parts by mass per 100 parts of resin and antistatic agents to 1-20 parts by mass per 100 parts of resin, achieving effective antistatic properties through chemical composition rather than high concentrations of conductive materials
Solution Approach 2:
The patent replaces expensive conductive fillers (metal powders, metal oxides) with more economical resin-based antistatic systems using polyester and polyurethane resins combined with antistatic agents, reducing material cost while maintaining functionality
3Stability of the object's composition
If the substrate film is stretched, then dimensional stability is improved, but the coating film develops cracks and follows the stretch poorly, deteriorating coating quality
Solution Approach 1:
The patent creates a composite coating system with polyester resin, polyurethane resin, and antistatic agents that forms a flexible, cohesive layer capable of accommodating substrate stretching without cracking, maintaining coating integrity during film formation
Solution Approach 2:
The patent optimizes the coating layer composition parameters including resin ratios, molecular weights, and additive concentrations to create a coating film with appropriate flexibility and adhesion that can follow substrate stretching without developing cracks
4Productivity
If printing speed is increased using UV-curable inks, then productivity is improved, but adhesion between inks, polyester film, and coating layer is weakened
Solution Approach 1:
The patent creates a multi-component coating system with polyester resin, polyurethane resin, and antistatic agents that provides enhanced surface properties and chemical composition to improve adhesion to UV-curable inks even under high-speed printing conditions with reduced UV irradiation
Solution Approach 2:
The patent optimizes coating layer composition parameters including the addition of crosslinking agents (melamine, isocyanate) that form strong chemical bonds with UV-curable inks, and controls resin molecular weights and ratios to enhance adhesion performance during high-speed printing
Data Source
AI summary
A readily adhesive white polyester film comprising a polyester film substrate and a coating layer on at least one surface of the polyester film substrate,the coating layer comprising a cationic antistatic agent containing nitrogen, a polyester resin, and a polyurethane resin,the proportion A (at %) of nitrogen derived from the antistatic agent and the proportion B (at %) of nitrogen derived from the polyurethane resin based on surface element distribution measurement by X-ray photoelectron spectroscopy in the coating layer satisfying the following formulas (i) and (ii), anda surface of the coating layer having a contact angle with respect to water of 50° to 70°:A (at %)>0.4 (i)2.0≤B/A≤5.0. (ii)