Conductive Moisture-Curable Composition With UV Surface Drying

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Solution Overview

Problem

Existing electrically conductive room-temperature curable compositions struggle to balance fast surface drying with good stability and low resistivity, particularly due to issues with tack free time, curing depth, and stability when mixed with conductive fillers.

Innovation Solution

A composition comprising a polyfunctional silane compound, moisture scavenger, alkoxysilane isocyanurate compound, photo-acid generator, moisture-curing catalyst, and electrically conductive filler, which is applied and UV-cured before moisture curing to achieve fast surface drying and stability at room temperature with low resistivity.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Temperature

If a modified silane polymer composition is used for room temperature curing, then the composition can be cured at room temperature, but the surface drying speed and stability cannot be balanced

Engineering Contradiction:

Improvecuring temperatureVSAvoidcomposition stability

Core Design Contradiction:

TemperatureVSStability of the object's composition

Solution Approach 1:

The patent divides the curing process into two distinct stages: UV curing for rapid surface drying and moisture curing for complete bulk curing. This segmentation allows each curing mechanism to optimize its function, resolving the contradiction between room temperature curing capability and composition stability.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The composition includes a photoinitiator that enables preliminary UV curing action before moisture curing begins. This preliminary action provides fast surface drying to prevent skin formation and maintain stability during storage and application.

Inventive Principle:

Principle #10Preliminary action

2Speed

If light cured adhesive is used, then fast surface drying is achieved, but curing depth is limited due to low transmittance

Engineering Contradiction:

Improvesurface drying speedVSAvoidcuring depth

Core Design Contradiction:

SpeedVSLength of stationary object

Solution Approach 1:

The patent segments the curing function between UV light (for surface drying) and moisture diffusion (for deep bulk curing). This allows the composition to achieve both fast surface drying and adequate curing depth by using two complementary curing mechanisms.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The patent introduces moisture as an intermediary curing agent that can penetrate deep into the composition where UV light cannot reach. This intermediary mechanism resolves the curing depth limitation of light-cured adhesives.

Inventive Principle:

Principle #24Intermediary (Mediator)

3Speed

If acrylate and NCO hybrid chemistry is used, then fast surface drying is achieved, but stability deteriorates when mixed with electrically conductive filler

Engineering Contradiction:

Improvesurface drying speedVSAvoidmixing stability

Core Design Contradiction:

SpeedVSStability of the object's composition

Solution Approach 1:

The patent uses a photoinitiator system that activates curing only when exposed to UV light, rather than using inherently reactive acrylate-NCO hybrid chemistry that causes premature reaction. This allows the composition to remain stable during mixing and application.

Inventive Principle:

Principle #27Cheap short-living objects (Disposable)

4Temperature

If room temperature curing is used, then heat-sensitive plastic frames are preserved, but tack free time and stability cannot be balanced

Engineering Contradiction:

Improvecuring temperatureVSAvoidtack free time

Core Design Contradiction:

TemperatureVSLoss of time

Solution Approach 1:

The patent applies UV light as a preliminary action to achieve rapid surface drying at room temperature, eliminating the need for prolonged tack-free waiting time associated with conventional room temperature moisture curing alone.

Inventive Principle:

Principle #10Preliminary action

Solution Approach 2:

The patent replaces the purely chemical moisture-curing mechanism with a combined UV photopolymerization and moisture curing system, enabling rapid surface drying without requiring elevated temperatures.

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

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 exhibits a tack free time >4 hours, tack free time ≤2 minutes under UV, liquid state at room temperature after 4 hours, conductivity ≤0.05 ohm*cm after 7 days, and curing depth ≥0.5 mm after 24 hours, demonstrating a balance of fast drying and stability.

Implementation Method 1

a photo-acid generator, which is a sulfonium salt

Methodology Applied

Scientific EffectPhotolysis: Photodissociation

Implementation Method 2

an alkoxysilane isocyanurate compound... moisture-curing catalyst

Methodology Applied

Scientific EffectMoisture-curing reaction: Hydrolysis

Data Source

PatentUS20260078221A1Electrically conductive moisture-curable composition

Publication Date: 2026.03.19 HENKEL KGAA

AI summary

The present invention provides an electrically conductive moisture-curable composition, a method of applying the composition, a cured product of the composition, an article comprising the cured product, and a use of the composition or the cured product wherein the composition comprises: (A) a polyfunctional silane compound having at least two alkoxysilane groups, (B) a moisture scavenger, (C) an alkoxysilane isocyanurate compound and optionally an epoxy functional silane coupling agent, (D) a photo-acid generator, which is a sulfonium salt, (E) a moisture-curing catalyst, and (F) an electrically conductive filler.