Photocurable Conductive Black Composition for Fast UV Curing

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Solution Overview

Problem

Conductive compositions used in electronic devices require faster curing times to improve productivity, as thermal curing is time-consuming and unsuitable for thermally degradable components, necessitating the development of a photocurable conductive black composition that can cure quickly and effectively block visible light.

Innovation Solution

A photocurable conductive black composition comprising (meth)acrylate-functionalized urethane oligomers, polymerizable compounds, photoinitiators, visible-light blocking systems, and conductive fillers, which can be cured rapidly using UV light and maintains desired optical density and electrical conductivity.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If thermal curing mechanism is used for conductive composition, then complete crosslinking can be achieved, but curing time is long and productivity is low

Engineering Contradiction:
Improvecomplete crosslinkingVSAvoidcuring time
Core Design Contradiction:
ReliabilityVSLoss of time

Solution Approach 1:

The patent replaces the thermal curing mechanism with a photocuring mechanism using UV light and photoinitiators. This substitution changes the curing activation method from thermal energy to optical energy, enabling rapid curing within minutes while achieving complete crosslinking of the (meth)acrylate-functionalized urethane oligomer and polymerizable compound system.

Inventive Principle:
Principle #28Mechanics substitution (Replace mechanical system)

Solution Approach 2:

The patent changes the curing activation parameter from temperature to light wavelength. By selecting photoinitiators that absorb UV light and initiating (meth)acrylate group polymerization at room temperature under UV irradiation, the system achieves complete crosslinking without the prolonged high-temperature treatment required by thermal curing.

Inventive Principle:
Principle #35Parameter changes

2Reliability

If thermal treatment is applied to cure conductive composition, then complete curing is achieved, but electronic components may be thermally degradable

Engineering Contradiction:
Improvecomplete curingVSAvoidthermal degradation
Core Design Contradiction:
ReliabilityVSObject-affected harmful factors

Solution Approach 1:

The patent substitutes thermal curing with photocuring using UV light and photoinitiators. This replacement eliminates the need for high-temperature treatment that could degrade thermally sensitive electronic components, while still achieving complete crosslinking of the resin system through photo-induced polymerization of (meth)acrylate groups.

Inventive Principle:
Principle #28Mechanics substitution (Replace mechanical system)

Solution Approach 2:

The patent changes the curing activation parameter from temperature to light wavelength. By using UV light irradiation instead of thermal treatment, the system achieves complete curing at room temperature, avoiding thermal degradation of electronic components while maintaining reliable crosslinking of the conductive composition.

Inventive Principle:
Principle #35Parameter changes

3Illumination intensity

If black pigments or carbon black are added to adhesive resins to block visible light, then optical density increases, but curing speed decreases with thermal mechanism

Engineering Contradiction:
Improvevisible light blockingVSAvoidcuring time
Core Design Contradiction:
Illumination intensityVSLoss of time

Solution Approach 1:

The patent replaces thermal curing with photocuring to overcome the slow curing speed issue. By using photoinitiators that absorb UV light and initiate rapid polymerization of (meth)acrylate groups, the system achieves fast curing within minutes even in the presence of black pigments and carbon black that block visible light.

Inventive Principle:
Principle #28Mechanics substitution (Replace mechanical system)

Solution Approach 2:

The patent changes the curing activation parameter from thermal to optical, specifically using UV light wavelength that can penetrate through the black pigment-containing composition. This allows rapid photocuring to proceed despite the presence of visible light-blocking pigments, achieving both high optical density and fast curing speed.

Inventive Principle:
Principle #35Parameter changes

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 rapid curing within minutes, providing high optical density for visible light blocking and electrical conductivity, suitable for various electronic devices, while avoiding the limitations of thermal curing.

Implementation Method 1

photo-curing mechanism takes only a few seconds to achieve complete crosslinked

Methodology Applied
Scientific EffectPhotopolymerisation: Photopolymerisation

Implementation Method 2

irradiating light rays in a wavelength region of from 300 nm to 400 nm using a light source

Methodology Applied
Scientific EffectAbsorption (EM radiation): Absorption (EM radiation)

Implementation Method 3

visible-light blocking system... average optical density in the visible-light region from 400 nm to 700 nm, referred as ODAVG, being 1.0 or more

Methodology Applied
Scientific EffectAbsorption (EM radiation): Absorption (EM radiation)

Data Source

PatentUS20240150592A1Photocurable conductive black composition and a method for forming a cured product thereof
Publication Date: 2024.05.09 DUPONT ELECTRONICS INC

AI summary

Provided is a photocurable conductive black composition including: (a) at least one (meth)acrylate-functionalized urethane oligomer; (b) at least one photopolymerizable compound; (c) a photoinitiator; (d) a visible-light blocking system; (e) conductive fillers; and optionally (f) a thermal initiator.Also provided are a method for forming a cured product composed of the photocurable conductive black compositions, and an article comprising the cured product.