Low-Viscosity UV-Curable Silicone Release Paper Composition
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Solution Overview
Problem
High-viscosity solventless ultraviolet-curable silicone compositions struggle with uneven substrates, leading to increased application quantities and peeling noise when used with hot-melt pressure-sensitive adhesives, while there is a need for compositions that exhibit a positive dependency on peel speed to reduce noise.
Innovation Solution
A low-viscosity ultraviolet-curable silicone composition comprising an onium salt photoinitiator and a specific organopolysiloxane with a polymerization degree of 8 to 20, which allows for excellent wetting of substrates with unevenness and favorable curing, resulting in a peel strength that increases with peel speed.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If high-viscosity solventless ultraviolet-curable silicone composition is used, then health and safety are improved by eliminating solvents, but substrate wetting deteriorates on uneven surfaces requiring increased application quantity
Solution Approach 1:
The patent modifies the chemical composition parameters of the silicone system by selecting specific organopolysiloxanes with controlled molecular weight and functionality, along with compatible photoinitiators and catalysts, to achieve low viscosity in the solventless formulation while maintaining ultraviolet curability and proper substrate wetting characteristics
2Manufacturing precision
If high-viscosity silicone is applied to uneven substrates, then coverage is improved, but application quantity must be increased leading to waste
Solution Approach 1:
The patent adjusts the viscosity parameter of the silicone composition to an optimal low range through careful selection of base polymers and additives, enabling the coating to flow and wet uneven substrate surfaces effectively at standard application quantities without requiring excess material
3Strength
If conventional release paper is peeled from hot-melt pressure-sensitive adhesive, then adhesion is achieved, but peeling noise occurs due to insufficient peel strength dependency on peel speed
Solution Approach 1:
The patent modifies the adhesive composition parameters including polymer type, molecular weight distribution, and additive selection to achieve a peel strength characteristic that increases with peel speed, thereby suppressing peeling noise while maintaining proper adhesion to the substrate
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 effectively reduces peeling noise by maintaining low viscosity, ensuring excellent substrate wetting and adherence, while allowing for easy peeling from pressure-sensitive adhesives, making it suitable for release papers and coatings.
Implementation Method 1
an onium salt photoinitiator and a specific organopolysiloxane... which allows for excellent wetting of substrates with unevenness and favorable curing
Implementation Method 2
exhibits excellent wetting of substrates having significant unevenness
Data Source
AI summary
An ultraviolet-curable silicone composition for a release paper including (A) 100 parts by mass of a specific organopolysiloxane having a polymerization degree of 8 to 20 and containing one epoxy group, and (C) an effective quantity of an onium salt photoinitiator. In a preferred embodiment, the composition further includes (B) 10 to 1,000 parts by mass of at least one specific organopolysiloxane containing a plurality of epoxy groups. In another preferred embodiment, the composition has a viscosity of not more than 100 mPa·s. The composition has a peel strength that exhibits a positive dependency on the peel speed when peeled from a hot-melt pressure-sensitive adhesive, and can therefore be used to produce a release paper capable of reducing peeling noise. Further, because the composition has a low viscosity, it exhibits excellent wetting of substrates having significant unevenness, even in a solventless form.