Cycloolefin Film Coating Adhesion Without Plasma Treatment
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Solution Overview
Problem
Cycloolefin films face reduced adhesion strength and optical properties when subjected to surface coating treatments, and existing methods to enhance adhesion involve costly and inefficient hydrophilic surface treatments like corona or plasma.
Innovation Solution
A coating composition comprising an acrylate binder resin, olefin resin, photoinitiator, and solvent, with optional fine particles and surfactants, which forms a coating layer with excellent adhesion strength and mechanical properties without requiring hydrophilic surface treatment.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If hydrophilic surface treatment (corona, plasma) is applied to cycloolefin film, then adhesion strength is improved, but manufacturing complexity and cost increase
Solution Approach 1:
The patent extracts the surface treatment step from the manufacturing process by developing a coating composition that achieves strong adhesion without requiring corona or plasma treatment. The coating formulation itself contains the adhesion-promoting functionality, eliminating the need for separate surface modification steps.
Solution Approach 2:
The patent introduces a specially formulated coating composition as an intermediary between the cycloolefin film and the desired coating layer. This coating acts as a mediator that provides both adhesion and the required optical/mechanical properties, replacing the need for surface treatment intermediaries.
2Strength
If conventional coating composition is used on cycloolefin film, then optical properties are maintained, but adhesion strength is insufficient
Solution Approach 1:
The patent changes the chemical and physical parameters of the coating composition, specifically using a blend of acrylic resin and olefin resin with controlled molecular weights and compositions. This parameter optimization enables the coating to achieve both strong adhesion and durability simultaneously.
Solution Approach 2:
The patent employs a composite coating system combining acrylic resin (for adhesion) and olefin resin (for optical and mechanical properties). This composite formulation allows the coating to simultaneously provide strong adhesion to cycloolefin film and maintain desirable optical transparency and mechanical durability.
3Illumination intensity
If triacetyl cellulose film is used for protection, then transparency and optical isotropic property are achieved, but heat and moisture resistance deteriorate
Solution Approach 1:
The patent changes the material composition from triacetyl cellulose to cycloolefin polymer, which has inherently superior heat and moisture resistance while maintaining the required optical transparency and isotropic properties. This material substitution resolves the contradiction between optical performance and environmental resistance.
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 composition maintains desirable optical and mechanical properties while significantly improving adhesion strength to cycloolefin films, enhancing durability and scratch resistance without the need for hydrophilic surface treatments.
Implementation Method 1
a coating composition comprising an acrylate binder resin, olefin resin, photoinitiator, and solvent
Data Source
AI summary
The present invention relates to a coating composition of a cycloolefin film that includes 100 parts by weight of an acrylate binder resin, 5 to 50 parts by weight of an olefin resin, 2 to 20 parts by weight of a photoinitiator, and 80 to 400 parts by weight of a solvent. The coating composition of the cycloolefin film may further include 1 to 20 parts by weight of fine particles having an average particle size in the range of 0.5 to 5 D. The coating composition may be used as a hard coating composition and a dazzling prevention coating composition in respects to the cycloolefin film. The coating composition of the cycloolefin film according to the present invention can provide a coating layer which has excellent adhesion strength in respects to the cycloolefin film while desirable optical properties such as a dazzling prevention property and a reflection prevention property and desirable mechanical properties such as scratch resistance and abrasion resistance which are capable of being obtained in a known technology are maintained by applying an olefin resin to the coating composition even though a cycloolefin film is not subjected to a hydrophilic surface treatment process such as corona, plasma and the like.