Polarizing Plate Adhesive Acid Content Control
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Solution Overview
Problem
The reduction in thickness of polarizing films for image display devices leads to deterioration in optical properties and reworkability, as well as increased difficulty in handling and a higher likelihood of film breakage during reworking, due to direct contact between the pressure-sensitive adhesive layer and the polarizing film.
Innovation Solution
A polarizing film with a pressure-sensitive adhesive layer where the pressure-sensitive adhesive polymer contains less than 8 wt % acid component, specifically designed to minimize the negative impact on the polarizing film's performance, with a thickness of 10 μm or less and an acid component range of 0 to 6 wt %, ensuring excellent optical properties and durability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Length of moving object
If the thickness of the polarizing film is reduced to achieve thinner image display devices, then the overall thickness and weight are reduced, but the optical properties deteriorate and the film becomes more prone to breakage during reworking
Solution Approach 1:
A release film is introduced as an intermediary layer between the pressure-sensitive adhesive layer and the polarizing film. This release film prevents direct contact between the adhesive and the thin polarizing film, thereby maintaining optical properties and preventing film breakage during reworking while still allowing for effective bonding when needed
Solution Approach 2:
The invention specifies controlling the acid component content in the pressure-sensitive adhesive polymer within a specific range (0.1-10 wt%) to optimize the balance between adhesion performance and compatibility with the polarizing film, preventing deterioration of optical properties while maintaining bonding effectiveness
2Device complexity
If a pressure-sensitive adhesive layer is provided directly on the polarizing film to eliminate the protection film, then the structure is simplified and thickness is reduced, but the optical properties and reworkability deteriorate
Solution Approach 1:
The release film serves as a mediator that allows the pressure-sensitive adhesive layer to be applied directly to the polarizing film structure while preventing harmful direct interaction between the adhesive and the film, thus maintaining simplicity of structure while preserving optical properties
Solution Approach 2:
The release film is selectively positioned only where needed - between the pressure-sensitive adhesive layer and the polarizing film - providing local protection without adding overall complexity to the entire polarizing plate structure
Data Source
AI summary
Provided is a polarizing plate with a pressure-sensitive adhesive layer which is excellent in reliability of optical properties and durability of pressure-sensitive adhesion. The polarizing plate with a pressure-sensitive adhesive layer comprises a polarizing film and a pressure-sensitive adhesive layer provided directly on at least one surface of the polarizing film. The pressure-sensitive adhesive layer comprises a pressure-sensitive adhesive composition containing a pressure-sensitive adhesive polymer, and an amount of an acid component in a total monomer component constituting the pressure-sensitive adhesive polymer is less than 8 wt %.