Nitro-Containing Bisoxime Ester Photoinitiator for UV-LED Curing

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Solution Overview

Problem

Existing oxime ester photoinitiators have limited performance under UV-LED light sources due to their narrow emission spectrum, leading to unsatisfactory application results compared to traditional UV mercury lamps, which are energy-inefficient and environmentally unfriendly.

Innovation Solution

A nitro-containing bisoxime ester photoinitiator with a specific chemical structure is designed to exhibit superior photosensitivity, storage stability, and developability, optimized for use with both mercury lamps and UV-LEDs, particularly at a wavelength of 395 nm, through an esterification reaction process.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Loss of energy

If existing oxime ester photoinitiators are used with UV-LED light sources, then energy consumption is reduced and environmental friendliness is improved, but photosensitivity and application performance deteriorate due to narrow light emission spectrum

Engineering Contradiction:

Improveenergy consumptionVSAvoidphotosensitivity

Core Design Contradiction:

Loss of energyVSReliability

Solution Approach 1:

The patent modifies the chemical structure parameters of photoinitiators by introducing nitro groups and designing specific molecular configurations (formula I and formula II) that shift absorption spectra to match UV-LED emission wavelengths, particularly around 395 nm, thereby maintaining high photosensitivity under UV-LED irradiation

Inventive Principle:

Principle #35Parameter changes

Solution Approach 2:

The patent develops composite photoinitiator systems combining different molecular structures (carbazole derivatives with oxime ester groups, dinitrobenzene derivatives) to achieve broad absorption coverage that matches the narrow UV-LED spectrum while maintaining compatibility with photocurable resins

Inventive Principle:

Principle #40Composite materials

2Reliability

If broad-spectrum UV mercury lamps are used to activate existing photoinitiators, then photosensitivity is improved, but energy consumption increases and environmental friendliness deteriorates

Engineering Contradiction:

ImprovephotosensitivityVSAvoidenergy consumption

Core Design Contradiction:

ReliabilityVSLoss of energy

Solution Approach 1:

The patent optimizes the absorption spectrum parameters of photoinitiators to specifically target the 395 nm wavelength region where UV-LEDs emit most strongly, replacing the need for broad-spectrum mercury lamps and thereby reducing energy consumption while maintaining effective photosensitivity

Inventive Principle:

Principle #35Parameter changes

3Power

If existing photoinitiators are designed for short wavelength UV absorption, then activation efficiency under mercury lamps is improved, but adaptability to UV-LED light sources deteriorates

Engineering Contradiction:

Improveactivation efficiencyVSAvoidlight source adaptability

Core Design Contradiction:

PowerVSAdaptability or versatility

Solution Approach 1:

The patent designs photoinitiators with dual functionality: the molecular structures in formula I and formula II are engineered to absorb both traditional mercury lamp wavelengths (365 nm, 395 nm) and UV-LED wavelengths (380-405 nm), making them universally applicable across different light source types

Inventive Principle:

Principle #6Universality (Multi-functionality)

Solution Approach 2:

The patent adjusts the chromophore parameters and conjugation length in the photoinitiator molecules to broaden the absorption band edge, enabling effective activation across a wider wavelength range that encompasses both mercury lamp and UV-LED emission spectra

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 nitro-containing bisoxime ester photoinitiator demonstrates excellent performance in photocurable compositions, including improved photosensitivity and pattern integrity under UV-LED light, enhancing the adaptability and efficiency of UV-LED technology in photocuring applications.

Implementation Method 1

it exhibits a photosensitive property, which is obviously superior to those of existing photoinitiators, under the irradiation of UV-LEDs having single wavelengths (such as 395 nm)

Methodology Applied

Scientific EffectLight absorption: Absorption (EM radiation)

Implementation Method 2

the design and the synthesis of novel oxime ester initiators, particularly those having better application performances, are always hot spots in the field of photocuring

Methodology Applied

Scientific EffectPhotodissociation: Photodissociation

Data Source

PatentUS9630913B2Nitro-containing bisoxime ester photoinitiator and preparation method and use thereof

Publication Date: 2017.04.25 CHANGZHOU TRONLY NEW ELECTRONICS MATERIALS CO LTD

AI summary

This present invention discloses a nitro-containing bisoxime ester photoinitiator having a structure represented by general formula (I). This photoinitiator has excellent application performances in terms of storage stability, photosensitivity, developability, pattern integrity, etc., and it has good adaptability to single-wavelength UV-LED light sources and exhibits a photosensitive property, which is obviously superior to those of existing photoinitiators, under the irradiation of UV-LEDs.