Polyorganosiloxane Release Coating Composition for Electronics
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Solution Overview
Problem
The electronics industry seeks a polyorganosiloxane release coating composition that provides a tight release force with low migration to prevent contamination of electronic components while maintaining desired release properties.
Innovation Solution
A polyorganosiloxane release coating composition comprising a polydiorganosiloxane with silicon-bonded alkenyl and aryl groups, a polyorganosilicate resin, a polyalkylhydrogensiloxane, a hydrosilylation reaction catalyst, and an inhibitor, along with an anchorage additive, which is applied and cured to form a release liner.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Force
If a high release additive (siloxane resin) is added to a diluted or solvent based release coating composition to increase release force, then release force is improved, but formulation efficiency deteriorates
Solution Approach 1:
The patent changes the molecular weight parameter of the polydiorganosiloxane to at least 3,000 g/mol and controls the alkenyl group content within specific ranges (0.01-5 wt%). These parameter changes enable the base polymer itself to provide sufficient release force without requiring additional high release additives, thereby resolving the contradiction between achieving high release force and maintaining formulation efficiency.
2Force
If release force is increased to provide tight release, then release performance is improved, but migration risk increases causing contamination of electronic components
Solution Approach 1:
The patent creates a composite coating system by combining polydiorganosiloxane with specific molecular weight (≥3,000 g/mol) and controlled alkenyl content (0.01-5 wt%) with polyorganosilicate resin having silicon bonded alkenyl groups. This composite formulation achieves tight release performance while the controlled composition prevents excessive migration that would cause contamination of electronic components.
Solution Approach 2:
By controlling the alkenyl group content within a specific range (0.01-5 wt%) and setting the molecular weight threshold at 3,000 g/mol, the patent optimizes the balance between release force and migration resistance. These parameter changes ensure sufficient release performance while preventing the coating from becoming too fluid or migratory.
3Force
If release force is increased, then release performance is improved, but adhesion strength decreases leading to poor sustained performance
Solution Approach 1:
The patent optimizes the molecular weight parameter to at least 3,000 g/mol and controls alkenyl content within 0.01-5 wt%, which provides sufficient release force while maintaining adequate adhesion strength for sustained performance.
Solution Approach 2:
The combination of polydiorganosiloxane (providing release properties) with polyorganosilicate resin (providing adhesion and anchorage) creates a composite coating that simultaneously achieves high release force and sustained adhesion strength, resolving the contradiction between these two 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 composition achieves high and sustained release force, reducing the risk of contamination and maintaining adhesion strength over time, as demonstrated by increased release force values and low subsequent adhesion strength in testing.
Implementation Method 1
a polyalkylhydrogensiloxane, having at least two silicon-bonded hydrogen atoms per a molecule, where the polyalkylhydrogensiloxane is present in an amount sufficient to provide 0.8 mole to 5 moles of silicon-bonded hydrogen atoms per mole of alkenyl groups in starting materials (A) and (B); (D) a hydrosilylation reaction catalyst in a catalytic amount
Implementation Method 2
a hydrosilylation reaction inhibitor, in an amount of 0.001 part by weight to 2 parts by weight, per 100 parts by weight of starting materials (A) and (B)
Data Source
Figure 1
AI summary
Provided is a polyorganosiloxane release coating composition, including: (A) an aryl-functional polydiorganosiloxane having a content of aliphatically unsaturated groups, (B) a polyorganosilicate resin having silicon bonded alkenyl groups, (C) a polyalkylhydrogensiloxane, having at least two silicon-bonded hydrogen atoms per a molecule, (D) a hydrosilylation reaction catalyst in a catalytic amount, (E) a hydrosilylation reaction inhibitor, (F) an anchorage additive, and optionally (G) a solvent; where the composition is free of polydiorganosiloxanes that do not have silicon bonded aryl groups, other than starting material (A). Also provided are a method for preparing a release liner(100) with a release coating(101) and the prepared release liner(100).