Fluorocopolymer Release Agent Composition for Adhesion and Releasability
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Solution Overview
Problem
Existing release agents containing perfluoroalkyl groups with more than 8 carbon atoms pose environmental concerns due to high persistence and accumulation, necessitating a composition that imparts moderate adhesion and releasability while minimizing environmental burden.
Innovation Solution
A fluorocopolymer composition with structural units based on specific monomers, including a C1-6 polyfluoroalkyl group and a (meth)acrylate with a C18-30 alkyl group, dispersed in an aqueous medium, along with optional halogenated olefins and crosslinkable functional groups, to create a release paper with improved adhesion and releasability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a perfluoroalkyl group with more than 8 carbon atoms is used in the release agent, then releasability is improved, but environmental persistence and accumulation increase
Solution Approach 1:
The patent changes the carbon atom parameter of the polyfluoroalkyl group from more than 8 (conventional) to 6 or fewer (invention). This parameter modification maintains the releasability function while reducing environmental persistence and accumulation, directly resolving the technical contradiction between performance and environmental harm.
Solution Approach 2:
The patent applies local quality by specifically modifying the fluorocarbon chain length in the polyfluoroalkyl group while maintaining other functional components of the release agent. The shortened C1-6 polyfluoroalkyl group retains sufficient hydrophobic and release properties locally, while reducing the overall environmental burden of the molecule.
2Reliability
If a silicone type release agent is used, then releasability is achieved, but the release layer is easily attached to the substrate making repeated bonding and separation difficult
Solution Approach 1:
The patent uses a composite material approach by combining a fluorocopolymer (containing polyfluoroalkyl groups) with specific functional monomers. This composite structure provides both the releasability from the fluorinated components and the controlled adhesion characteristics needed for repeated bonding and separation, overcoming the limitations of silicone-based agents.
Data Source
AI summary
The present invention provides a release agent composition which can impart moderate adhesion and releasability to the surface of articles such as protective materials for adhesive face of repositional notes, pressure-sensitive adhesive sheets and tapes, release films and release paper, and which has a low environmental burden, and its production process. The release agent composition of the present invention is characterized by comprising a fluorocopolymer having structural units based on a monomer (a) having a C1-6 polyfluoroalkyl group and structural units based on a (meth)acrylate (b) having a C18-30 alkyl group, and a medium.