Acrylic Polymer Release Agent for Adhesive Transfer Tape
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Solution Overview
Problem
In adhesive transfer tapes used in electronics, such as HDD applications, achieving a sufficient releasing force ratio between heavy and light release surfaces is challenging, especially when using long chain alkyl-based release liners, and fluorine-based materials often require solvent disposal, necessitating a non-silicone, non-fluorine (NSNF) release solution.
Innovation Solution
An acrylic polymer release agent is developed with a polymerization product of a polymerizable precursor composition containing a high percentage of acrylate monomers with branched alkyl groups of 24 or more carbon atoms and a benzophenone structure, which forms a release coating suitable for light release surfaces, and a second release agent with a lower percentage of these monomers for heavy release surfaces, both cured using radiation to ensure efficient bonding and low residual adhesive force.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If a long chain alkyl-based release liner is used for the light release surface, then silicone contamination is avoided, but the releasing force ratio of the heavy release surface to the light release surface becomes insufficient
Solution Approach 1:
The invention changes the chemical composition parameters of the release agent by using specific acrylate monomers with branched alkyl groups having 24 or more carbon atoms (Formula 1) combined with acrylic monomers having a benzophenone structure (Formula 2). This parameter change enables the release coating to achieve both non-silicone properties and sufficient releasing force ratio without fluorine compounds.
Solution Approach 2:
The invention uses a composite release agent system combining two types of monomers: acrylate monomers with long branched alkyl groups (for low surface energy and release properties) and benzophenone-containing acrylic monomers (for UV curability). This composite approach achieves the desired balance between contamination prevention and release performance.
2Ease of operation
If a fluorine-based release liner is used for the light release surface, then light releasing performance is achieved, but disposal issues arise and fluorine-based solvents are required
Solution Approach 1:
The invention extracts and eliminates fluorine compounds from the release liner system while retaining the essential light release functionality. By using acrylate monomers with branched alkyl groups (24+ carbon atoms) as the base material, the patent achieves fluorine-free release performance that avoids all associated disposal and solvent issues.
Solution Approach 2:
The invention employs a UV-curable acrylic polymer release agent that forms a disposable, environmentally friendly coating without requiring fluorine-based solvents. The benzophenone-containing monomer enables UV curing to create a functional release surface that can be disposed of without the environmental burden of fluorine compounds.
3Object-affected harmful factors
If acrylate monomers with branched alkyl groups of 24 or more carbon atoms are used, then surface energy is reduced for better release, but polymerization control becomes challenging
Solution Approach 1:
The invention introduces benzophenone-containing acrylic monomers as an intermediary component that facilitates controlled polymerization. The benzophenone group acts as a photoinitiator site that enables UV-triggered polymerization, providing control over the polymerization process while the long branched alkyl groups maintain the low surface energy properties.
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 a NSNF release liner and tape with a smooth, wide-range releasing force, reducing surface energy and crystallinity, and maintaining high residual adhesive force, suitable for electronic components and double-sided tapes, while avoiding silicone and fluorine contamination.
Implementation Method 1
an acrylic monomer having a benzophenone structure
Implementation Method 2
acrylate monomer having a branched alkyl group having 24 or more carbon atoms
Data Source
AI summary
Object Provided is a long chain alkyl-based release agent useful in production of a light release liner that can be used in a light release surface of an adhesive transfer tape. Solution means An acrylic polymer release agent according to an embodiment includes a polymerization product of a polymerizable precursor composition containing an acrylate monomer having a branched alkyl group having 24 or more carbon atoms and an acrylic monomer having a benzophenone structure.