Silicone Release Coating Composition for Low-Force Adhesive Peeling
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Solution Overview
Problem
Existing silicone release agents are costly due to high fluorine content, and they either have insufficient release force or residual adhesive strength, or both, when peeling from silicone adhesives.
Innovation Solution
A silicone release agent composition comprising specific ratios of organopolysiloxanes with alkenyl and aryl groups, without fluorine, and a catalytic amount of a platinum group metal catalyst, which forms a release layer with low release force and high residual adhesive strength.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Force
If a fluorine-containing silicone release agent is used to provide excellent releasability from silicone adhesives, then the release force is improved, but the cost increases significantly
Solution Approach 1:
The patent changes the chemical composition parameters by using fluorine-lacking silicone polymers with specific functional groups (vinyl, allyl, cycloalkenyl) combined in precise ratios with fluorine-containing polymers. This parameter adjustment achieves the desired release force while significantly reducing fluorine content and cost compared to conventional high-fluorine release agents
Solution Approach 2:
The patent creates a composite silicone release agent composition combining multiple polymer types: fluorine-containing organopolysiloxane (0.1-10 parts), fluorine-lacking organopolysiloxane with vinyl/allyl groups (50-90 parts), and fluorine-lacking organopolysiloxane with cycloalkenyl groups (40-90 parts). This composite approach leverages the complementary properties of each component to achieve optimal release characteristics at lower cost
2Ease of manufacture
If a fluorine-lacking silicone release agent is used to reduce cost, then the manufacturing cost decreases, but the release force becomes insufficient
Solution Approach 1:
The patent develops a composite system where fluorine-lacking polymers with specific functional groups (vinyl, allyl, cycloalkenyl) work synergistically with small amounts of fluorine-containing polymer. The fluorine-lacking components provide cost reduction and baseline release properties, while the fluorine-containing component enhances the release force, achieving both cost efficiency and adequate performance
Solution Approach 2:
The patent applies local quality by concentrating the fluorine-containing polymer specifically at the surface interface where release from adhesive is needed, while the bulk of the composition uses cost-effective fluorine-lacking polymers. This localized approach ensures adequate release force at the critical interface while minimizing overall fluorine content and cost
3Strength
If a silicone release agent with high fluorine content is used to ensure strong adhesion to substrate, then the residual adhesive strength is improved, but the release force increases causing heavy peeling
Solution Approach 1:
The patent optimizes the ratio parameters of fluorine-containing to fluorine-lacking polymers to achieve a balance where sufficient fluorine remains at the interface for strong adhesive bonding, while the fluorine-lacking components prevent excessive release force. The specific ratio ranges (0.1-10 parts fluorine-containing to 50-90 parts fluorine-lacking) are tuned to maintain optimal adhesion while controlling peeling characteristics
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 composition achieves a low-cost release layer with minimal fluorine content, allowing easy peeling from silicone adhesives while maintaining strong adhesive strength after peeling.
Implementation Method 1
a silicone release agent having a fluorine-containing organic group is cured via hydrosilylation to form a cured film
Data Source
AI summary
The present invention provides a silicone release agent composition comprising the components (A), (B), (C) and (D): 50 to 99.9 parts by mass of (A) linear or branched organopolysiloxane represented by the general formula (1) and having at least two alkenyl group-containing organic groups and at least one aryl group-containing organic group in one molecule and having no fluorine-containing organic group, wherein a percentage of the number of the alkenyl group-containing organic group is 0.005 to 5% and a percentage of the number of the aryl group-containing organic groups is 0.1 to 40%, each based on the total number of groups each bonded to a silicon atom; 50 to 0.1 part by mass of (B) linear or branched organopolysiloxane having at least one alkenyl group-containing organic group and at least one fluorine-containing organic group in one molecule, wherein a percentage of the number of the fluorine-containing organic group is 3% to 50%, based on the total number of groups each bonded to a silicon atom, provided that the total amount of components (A) and (B) is 100 parts by mass; (C) organohydrogenpolysiloxane having three or more hydrogen atoms each bonded to a silicon atom in one molecule and having no fluorine-containing organic group, in such an amount that a ratio of the number of the SiH group in component (C) to the total number of the alkenyl group in components (A) and (B) is from 0.5 to 15; and a catalytic amount of (D) platinum group metal catalyst, provided that the silicone release agent composition does not comprise (E) organohydrogenpolysiloxane having one or more hydrogen atoms each bonded to a silicon atom and having a fluorine-containing organic group.