Release Sheet Coating Composition for PSA Release and Adhesion
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Solution Overview
Problem
Existing release sheet compositions exhibit insufficient release properties for pressure-sensitive adhesive materials, leading to a loss of adhesive force after peeling, which is undesirable for applications like synthetic leather manufacturing.
Innovation Solution
Incorporating an organopolysiloxane additive with specific formula (R1, R2, R3, a, b, and c values) into a release sheet-forming resin composition, along with acrylic resin and melamine compounds, to create a release coating that maintains high subsequent adhesion and satisfactory release properties.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional release agent compositions (hydroxy-containing acrylic resin or amino resin combined with silicone resin) are used to form a release coating, then good release properties relative to non-pressure-sensitive adhesive materials are achieved, but insufficient release properties relative to pressure-sensitive adhesive materials occur
Solution Approach 1:
The invention modifies the chemical composition parameters of the release coating by introducing a specific organopolysiloxane compound with silane groups that can crosslink with isocyanate groups. This chemical parameter change enables the coating to interact differently with pressure-sensitive adhesives, providing adequate release properties for this specific adhesive type while maintaining performance with non-pressure-sensitive adhesives.
Solution Approach 2:
The invention creates a composite release coating system by combining conventional resin components (acrylic resin, amino resin, silicone resin) with a specially designed organopolysiloxane containing crosslinkable silane groups. This composite formulation integrates the benefits of multiple material systems to achieve broad-spectrum release properties across different adhesive types.
2Ease of operation
If the release coating is designed to provide easy release, then the adhesive material can be peeled off, but the pressure-sensitive adhesive material loses its adhesive force after peeling (low subsequent adhesion)
Solution Approach 1:
The invention changes the chemical reactivity parameters of the release coating by incorporating organopolysiloxane with crosslinkable silane groups. This modification allows the coating to provide controlled release during application while maintaining the adhesive's bonding capability after peeling, thus simultaneously improving ease of operation and subsequent adhesion reliability.
Solution Approach 2:
The organopolysiloxane with silane groups acts as an intermediary layer between the release coating and the pressure-sensitive adhesive. It mediates the interaction by providing appropriate release properties during application while allowing the adhesive to retain its bonding function after peeling from the release surface.
3Productivity
If casting paper is used multiple times to increase productivity, then production efficiency improves, but the casting paper experiences change in peeling or release properties after repeated use
Solution Approach 1:
The invention applies preliminary chemical modification to the release coating by incorporating crosslinkable silane groups that form a stable network structure before use. This preliminary action creates a durable coating that maintains consistent release properties across multiple uses, enabling repeated use of casting paper without degradation of performance.
Solution Approach 2:
The crosslinked composite structure formed by the organopolysiloxane and isocyanate provides enhanced durability and stability. This composite material system resists degradation during repeated use, maintaining stable release properties and enabling multiple uses of the casting paper for increased productivity.
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 release sheet with improved release properties for pressure-sensitive adhesive materials while maintaining high adhesion, enhancing the efficiency and durability of synthetic leather production.
Implementation Method 1
an organopolysiloxane having the formula (1)... helps the resin composition exhibit satisfactory release properties relative to pressure-sensitive adhesive materials
Data Source
AI summary
Provided is a light-release additive for a release sheet, which contains an organopolysiloxane represented by formula (1). (In the formula, R1 moieties each independently denote an unsubstituted or substituted alkyl group having 1-3 carbon atoms, R2 moieties each independently denote a monovalent organic group which has 1-10 carbon atoms, has a hydroxyl group, an amino group or a carboxyl group, and may include a heteroatom, and R3 moieties each independently denote an unsubstituted or substituted monovalent hydrocarbon group having 4-20 carbon atoms. a, b and c are numbers that satisfy the relationships 2 ≤ a ≤ 150, 0 ≤ 9b+19c ≤ a, and 2 ≤ a+b+c ≤ 166)