Solvent-Free Silicone Release Composition for Smooth High-Speed Coating
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Solution Overview
Problem
Existing solventless silicone release compositions form surface asperities and generate mist during high-speed coating, leading to increased release forces when used in producing release sheets, which are problematic for high-speed production and product quality.
Innovation Solution
A solventless silicone release composition comprising specific amounts of alkenyl-containing organopolysiloxane, organohydrogenpolysiloxane, platinum group metal base catalyst, and an organopolysiloxane with a crosslinked structure, which minimizes surface roughness and mist generation, enabling smooth and low-release-force coatings at high speeds.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If coating speed is increased to 250 m/min or higher to improve productivity, then production efficiency is improved, but mist generation increases and surface asperities are formed
Solution Approach 1:
The patent modifies the chemical composition parameters of the organopolysiloxane, specifically controlling the vinyl value within 0.01-0.5 mol/100g and using polymers with specific molecular weight distributions. These parameter changes reduce the tendency of the composition to generate mist during high-speed coating while maintaining coating quality and release properties.
2Productivity
If coating speed is increased to 250 m/min or higher to improve productivity, then production efficiency is improved, but surface roughness increases due to asperities
Solution Approach 1:
The patent controls the vinyl value parameter within 0.01-0.5 mol/100g and uses organopolysiloxanes with specific molecular characteristics to minimize surface asperity formation during high-speed coating, thereby maintaining smooth surface finish even at coating speeds of 250 m/min or higher.
Solution Approach 2:
Instead of trying to suppress mist generation through mechanical means or slower coating, the patent inverts the approach by formulating the composition itself to inherently resist mist formation and asperity development, allowing high-speed coating to proceed without the usual surface defects.
3Ease of manufacture
If surface asperities are formed by mist generation, then coating process is simplified, but release force increases due to adhesive anchoring
Solution Approach 1:
By precisely controlling the vinyl value parameter (0.01-0.5 mol/100g) and molecular weight distribution of the organopolysiloxane, the patent creates a composition that forms smooth surfaces without asperities, thereby maintaining low release force characteristics essential for release sheet functionality while proceeding with standard coating processes.
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 eliminates surface roughness and mist formation, resulting in a cured silicone film with satisfactory smoothness and reduced high-speed release force, suitable for high-speed production of release sheets.
Implementation Method 1
a cured film of an organopolysiloxane composition is disposed on the substrate surface... addition reaction between an alkenyl-containing organopolysiloxane and an organohydrogenpolysiloxane in the presence of a platinum base compound catalyst
Implementation Method 2
preventing adhesion or bonding between sheet-like substrates such as paper and plastic sheets and pressure-sensitive adhesives... a low release force is inherent to the cured silicone coating
Data Source
AI summary
The present invention provides a solvent-free silicone release composition containing (A) an alkenyl group-containing organopolysiloxane having a vinyl value of 0.016-0.7 mol/100 g and a kinematic viscosity at 25°C of 80-500 mm2/s, (B) an organo hydrogen polysiloxane having a kinematic viscosity of 2-500 mm2/s, (C) a platinum group metal-based catalyst, and (E) an organopolysiloxane having a crosslinked structure and fluidity. According to the present invention, surface roughness caused by high speed rotation of a roll or surface protrusions and recesses caused by the generation of mist can be eliminated during high-speed coating on a sheet-like substrate, and a release sheet can be obtained in which a cured silicone-coated surface has excellent smoothness and an adhesive-coated substrate has a low high-speed peel strength.