Non-Silicone Release Sheet for Semiconductor Adhesive Handling
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Non-silicone-based pressure sensitive adhesive sheets used in precision electronic device production face issues with releasability and antistatic properties, as silicone-based release agents can contaminate electronic parts and antistatic agents can cause bleeding of ionic substances, leading to corrosion and surface issues.
Innovation Solution
A release sheet with an undercoat layer containing a polyurethane-based resin and 0.1 to 45% lithium salt-based antistatic agent, combined with a rubber-based release agent layer, which is cured using an active energy beam, such as ultraviolet rays, to enhance releasability and prevent ionic substance bleeding.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a silicone-based release agent is used, then releasability is improved, but contamination of electronic parts occurs due to silicone compound transfer
Solution Approach 1:
The patent extracts and removes silicone-based release agents from the system entirely, replacing them with fluorocarbon-based release agents. This extraction eliminates the source of silicone compound contamination while maintaining the necessary releasability function through alternative chemistry.
Solution Approach 2:
The patent changes the chemical parameter of the release agent from silicone-based to fluorocarbon-based materials. This parameter change fundamentally alters the chemical composition to eliminate silicone compounds while maintaining release properties through different molecular mechanisms.
2Reliability
If an antistatic agent is added to the release agent layer, then antistatic property is improved, but ionic substances bleed out causing surface issues and corrosion
Solution Approach 1:
The patent introduces an undercoat layer as an intermediary barrier between the antistatic agent and the release agent layer. This undercoat layer contains the ionic substances and prevents their migration to the surface, while still allowing the antistatic function to operate effectively.
Solution Approach 2:
The patent creates a composite structure consisting of multiple layers with different functions: the undercoat layer provides ion containment while the fluorocarbon-based release agent layer provides release properties. This composite approach allows both antistatic and release functions to coexist without interference or harmful side effects.
3Object-affected harmful factors
If non-silicone-based release agents like alkyd or long-chain alkyl resins are used, then silicone contamination is prevented, but releasability deteriorates due to high releasing strength
Solution Approach 1:
The patent changes the chemical parameter of the release agent from conventional organic resins to fluorocarbon-based materials. This parameter change provides unique molecular characteristics that enable low releasing strength and good releasability without silicone contamination.
Solution Approach 2:
The patent uses fluorocarbon-based release agents in combination with specific undercoat layers to create a composite system that achieves optimal balance between non-contamination and releasability, overcoming the limitations of single-material approaches.
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 provides excellent releasability and antistatic properties while inhibiting the bleeding of ionic substances, preventing corrosion and surface issues in semiconductor devices, ensuring stable physical properties and surface states during the release process.
Implementation Method 1
a layer of a release agent comprising a rubber-based resin, which has been cured by irradiating with an active energy beam, such as ultraviolet rays
Data Source
AI summary
Provided is a release sheet which is non-silicone-based and has a good releasability from a layer of a pressure sensitive adhesive and which has a stable antistatic property without being influenced by the air environment and is free of bleeding out of ionic substances derived from an antistatic agent. The release sheet is prepared by providing an undercoat layer containing a polyurethane-based resin and 0.1 to 45% by mass of a lithium salt-based antistatic agent and a layer of a rubber-based release agent formed by coating and drying a liquid containing a release agent in order on a substrate.