PSA Sheet Adhesive Face Smoothness During Release Film Replacement
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Solution Overview
Problem
Pressure-sensitive adhesive (PSA) sheets with highly smooth adhesive faces can become roughened during handling and replacement of release films, affecting their smoothness and adhesion properties, especially in optical applications with increasing diversity, downsizing, and design complexity.
Innovation Solution
A release film-supported PSA sheet with a pressure-sensitive adhesive layer having a 100 °C storage modulus of 0.08 MPa or greater and a 23 °C storage modulus of 0.15 MPa or greater, where the adhesive faces have a ten-point mean roughness of 1000 nm or less, and the release film's surface roughness is matched to minimize surface roughening, ensuring high smoothness and adhesion.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the PSA sheet is handled during release film replacement, then the adhesive face can be protected and reused, but the adhesive face may become roughened and lose its smoothness
Solution Approach 1:
The patent applies preliminary action by pre-coating the release film with a release agent before it contacts the adhesive face. This preliminary treatment ensures that when the release film is later replaced during handling, the adhesive face remains protected from roughening and maintains its smoothness throughout the operation.
2Manufacturing precision
If the PSA sheet is manufactured with a highly smooth adhesive face, then optical performance is improved, but the smoothness is easily degraded during subsequent handling and release film replacement
Solution Approach 1:
The patent implements beforehand cushioning by applying a release agent coating to the release film before it contacts the adhesive face. This protective cushioning layer prevents direct adverse interaction between the release film and the precisely manufactured smooth adhesive face, thereby maintaining the stability of the smoothness property during handling and release film replacement operations.
3Reliability
If a release film is applied to protect the adhesive face, then protection during storage and transport is achieved, but the release film itself may cause roughening when replaced
Solution Approach 1:
The patent employs an intermediary approach by introducing a release agent as a mediating substance between the release film and the adhesive face. This release agent coating on the release film acts as an intermediary layer that prevents direct contact-induced roughening, allowing the release film to provide protection during storage and transport without compromising the adhesive face smoothness when replaced.
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 solution maintains the high smoothness and adhesion of the PSA sheet's adhesive faces even after release film replacement, enhancing its performance in optical and other applications by inhibiting roughening and ensuring consistent adhesion properties.
Implementation Method 1
pressure-sensitive adhesive (PSA) exists as a soft solid (a viscoelastic material) in a room temperature range and has a property to adhere easily to an adherend with some pressure applied
Data Source
Figure 1~2
AI summary
Provided is a PSA sheet having a PSA layer. The PSA sheet has a first face and a second face. The first face is a first adhesive face formed of one surface of the PSA layer. The first adhesive face has a 10-point mean roughness of 1000 nm or less. The PSA layer has a storage modulus of 0.08 MPa or greater at 100 °C.