Anti-Static Silicone Release Coatings Using Ionic Liquid Dispersion

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Solution Overview

Problem

Existing anti-static solutions for silicone release coatings require additional coating of anti-static primers on plastic substrates, leading to increased process steps and costs, and can interfere with the curing reaction or compromise interfacial anchorage.

Innovation Solution

A silicone release coating dispersion comprising a hydrosilylation reaction curable silicone release coating composition, a surfactant, and an aqueous phase with an ionic liquid and water, which is applied to a backing substrate, dried, and cured to form a silicone release coating with anti-static properties.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If additional anti-static primers are coated on plastic substrates, then anti-static properties are achieved, but process complexity and cost increase

Engineering Contradiction:

Improveanti-static propertiesVSAvoidprocess steps

Core Design Contradiction:

ReliabilityVSDevice complexity

Solution Approach 1:

The patent combines the anti-static function with the silicone release coating by incorporating ionic liquid directly into the coating composition. This merging eliminates the need for separate anti-static primer coating steps, reducing process complexity while maintaining anti-static properties through the ionic liquid's charge dissipation capability within the unified coating system.

Inventive Principle:

Principle #5Merging (Combining)

Solution Approach 2:

The silicone release coating composition is designed to perform multiple functions simultaneously: providing release properties, anti-static properties, and interfacial anchorage. By integrating ionic liquid into the coating formulation, the single coating step achieves what previously required multiple specialized coatings, demonstrating multi-functionality that reduces overall process complexity.

Inventive Principle:

Principle #6Universality (Multi-functionality)

2Reliability

If additional anti-static primers are applied, then anti-static properties are achieved, but manufacturing cost increases

Engineering Contradiction:

Improveanti-static propertiesVSAvoidmanufacturing cost

Core Design Contradiction:

ReliabilityVSEase of manufacture

Solution Approach 1:

By merging the anti-static function into the silicone release coating composition through ionic liquid incorporation, the patent eliminates the need for separate anti-static primer materials and application steps. This consolidation reduces manufacturing cost by reducing material inventory requirements, simplifying production workflows, and decreasing overall material consumption.

Inventive Principle:

Principle #5Merging (Combining)

3Reliability

If anti-static primers are coated on substrates, then anti-static properties are achieved, but interfacial anchorage may be compromised

Engineering Contradiction:

Improveanti-static propertiesVSAvoidinterfacial anchorage

Core Design Contradiction:

ReliabilityVSStrength

Solution Approach 1:

The patent merges the anti-static ionic liquid with the silicone release coating matrix, ensuring that both anti-static and anchorage functions are achieved through a single integrated coating. This eliminates the potential conflict between primer layers and coating layers, as the ionic liquid is incorporated within the coating itself rather than applied as a separate primer that could compromise interfacial bonding.

Inventive Principle:

Principle #5Merging (Combining)

4Reliability

If multiple coating steps are used, then anti-static properties are achieved, but productivity is limited

Engineering Contradiction:

Improveanti-static propertiesVSAvoidproduction efficiency

Core Design Contradiction:

ReliabilityVSProductivity

Solution Approach 1:

The patent combines multiple functions (release, anti-static, anchorage) into a single coating application step. By incorporating ionic liquid directly into the silicone release coating composition, the process eliminates sequential primer and coating applications, thereby improving productivity through reduced cycle time and simplified manufacturing operations.

Inventive Principle:

Principle #5Merging (Combining)

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 cost-effective and efficient method to integrate anti-static properties into silicone release coatings without additional process steps, ensuring effective dissipation of static charges and maintaining interfacial anchorage.

Implementation Method 1

The aqueous phase comprises (A) an ionic liquid and (B) water

Methodology Applied

Scientific EffectIonic conduction: Conduction (electrical)

Implementation Method 2

a hydrosilylation reaction curable silicone release coating composition

Methodology Applied

Scientific EffectHydrosilylation: Chemical Bonding

Data Source

PatentEP4396289B1Anti-static silicone release coatings and methods for their preparation and use

Publication Date: 2026.02.25 DOW SILICONES CORP

Figure 1

AI summary

A silicone release coating dispersion has a polyorganosiloxane continuous phase and an aqueous discontinuous phase. The aqueous discontinuous phase includes water and an ionic liquid. The polyorganosiloxane continuous phase includes a hydrosilylation reaction curable silicone release coating composition. A method for preparation of the silicone release coating dispersion, and a method for use thereof to form a silicone release coating are provided.