Silicone Release Liner Composition for Stable Peel Force Aging
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Solution Overview
Problem
Existing releasable film-forming silicone compositions struggle to maintain a consistent release force and residual adhesive strength over time, leading to changes in release force and reduced adhesive strength after long-term adhesion.
Innovation Solution
A release control agent comprising a silicone resin with specific molecular weight and hydroxyl group content, combined with diorganopolysiloxanes and α-olefins, is used to form a releasable film that maintains a stable release force and adhesive strength over time.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If conventional silicone resins are used as release control agents, then high-strength peeling can be achieved, but release force changes after long-term adhesion
Solution Approach 1:
The patent changes the molecular weight parameter of the silicone resin to a specific range (3,000 to 6,000 based on standard polystyrene by GPC) and controls the hydroxyl group content (2 to 5 mass %) to achieve both high peeling strength and stable release force over time
Solution Approach 2:
The patent creates a composite release control agent system combining silicone resin with specific molecular weight characteristics and controlled hydroxyl group content, achieving synergistic effects that maintain both high peeling strength and release force stability
2Strength
If conventional silicone resins are used as release control agents, then high-strength peeling can be achieved, but residual adhesive strength decreases after long-term aging
Solution Approach 1:
The patent optimizes the hydroxyl group content parameter to 2 to 5 mass %, which prevents excessive crosslinking and maintains residual adhesive strength while still achieving high peeling strength through controlled molecular interactions
3Strength
If silicone resin with higher molecular weight is used, then peeling strength increases, but release force stability decreases
Solution Approach 1:
The patent identifies and controls the molecular weight parameter within the specific range of 3,000 to 6,000 (by GPC using standard polystyrene), balancing peeling strength and release force consistency through optimized molecular size and chain length
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 releasable film with minimal change in release force and no reduction in residual adhesive strength after long-term aging, ensuring high-strength peeling and stable adhesion.
Implementation Method 1
a diorganopolysiloxane having at least two alkenyl groups in a molecule; an organohydrogenpolysiloxane having at least two silicon-bonded hydrogen atoms in a molecule; and an addition reaction catalyst
Implementation Method 2
an addition reaction catalyst
Data Source
AI summary
Provided is a release control agent containing a silicone resin having a weight average molecular weight based on standard polystyrene by gel permeation chromatography of 3,000 to 6,000 and expressed by the average unit formula: (R13SiO1/2)a(SiO4/2)1.0, wherein each R1 independently represents an alkyl group with 1 to 6 carbon atoms, and “a” represents a number from 0.5 to 1.5, and (B) a diorganopolysiloxane having at least two silicon-bonded alkenyl groups in a molecule and/or (C) an α-olefin with 12 to 24 carbon atoms. Also provided is a releasable film-forming silicone composition containing the release control agent. The releasable film-forming silicone composition forms a releasable film with little change in release force and that does not reduce the residual adhesive strength of a pressure sensitive adhesive (PSA) after long-term aging in a state adhered to the PSA despite exhibiting a relatively large release force with respect to the PSA.