UV-Curable Coating Composition with Cycloaliphatic Monomers for Adhesion

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Solution Overview

Problem

Conventional UV-curable compositions for digital printing on substrates face challenges such as limited adhesion range, high health risks due to photoinitiators, and increased production costs, while also requiring rapid curing and mechanical robustness.

Innovation Solution

A UV-curable composition comprising monofunctional acrylate/methacrylate monomers with specific hydrocarbon radicals, vinyl monomers with heterocyclic radicals, and a Norrish type I photoinitiator, which provides excellent adhesion, rapid curing, and mechanical robustness with reduced photoinitiator amounts.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Productivity

If large amounts of photoinitiators are used to achieve wide adhesion range and rapid curing, then curing speed and adhesion are improved, but health risks and raw material costs increase

Engineering Contradiction:

Improvecuring speedVSAvoidhealth risks from photoinitiators

Core Design Contradiction:

ProductivityVSObject-affected harmful factors

Solution Approach 1:

The patent changes the chemical composition parameters by using specific monofunctional acrylate/methacrylate monomers with cycloaliphatic or bicyclic hydrocarbon radicals in controlled amounts (5-50 wt%). This compositional parameter change enables the formulation to achieve rapid curing and wide adhesion with significantly reduced photoinitiator content, directly resolving the contradiction between curing speed and health risks

Inventive Principle:

Principle #35Parameter changes

Solution Approach 2:

The patent creates a composite UV-curable composition by combining multiple specific monomers (monofunctional acrylate/methacrylate with cycloaliphatic or bicyclic hydrocarbon radicals) in defined ratios. This composite approach synergistically enhances adhesion and curing performance while reducing reliance on high photoinitiator concentrations, thereby addressing both productivity and harmful factors

Inventive Principle:

Principle #40Composite materials

2Reliability

If high proportions of multifunctional acrylate monomers are used to achieve required reactivity, then curing reactivity is improved, but adhesion range to different substrates is restricted

Engineering Contradiction:

Improvecuring reactivityVSAvoidadhesion range

Core Design Contradiction:

ReliabilityVSAdaptability or versatility

Solution Approach 1:

The patent changes the functional group parameter by using monofunctional acrylate/methacrylate monomers instead of high proportions of multifunctional monomers. This parameter change maintains curing reactivity through the selected monomer chemistry while improving adhesion range to diverse substrates including polyvinyl chloride, polymethyl methacrylate, polypropylene, and other advertising technology substrates

Inventive Principle:

Principle #35Parameter changes

3Adaptability or versatility

If conventional paint formulations are used to achieve wide adhesion range, then adhesion to multiple substrates is improved, but health risks and production costs increase due to high photoinitiator content

Engineering Contradiction:

Improveadhesion rangeVSAvoidproduction costs

Core Design Contradiction:

Adaptability or versatilityVSEase of manufacture

Solution Approach 1:

The patent changes the formulation parameters by precisely controlling the types and amounts of monofunctional acrylate/methacrylate monomers (5-50 wt%) and photoinitiators (1-10 wt%). This optimized parameter set achieves wide adhesion range to multiple substrates while reducing photoinitiator content, thereby lowering both health risks and raw material costs

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 superior adhesion and mechanical robustness on various substrates with lower photoinitiator usage, reducing health risks and production costs while maintaining rapid curing and weathering resistance.

Implementation Method 1

UV-curable composition comprises monofunctional acrylate monomer/methacrylate monomer, vinyl monomer with heterocyclic radical, and photoinitiator for UV curing

Methodology Applied

Scientific EffectPhotopolymerization: Photopolymerisation

Data Source

PatentUS11459471B2UV-curable composition for coating or printing on a substrate and/or a substrate surface

Publication Date: 2022.10.04 MARABU GMBH & CO KG

AI summary

A UV-curable composition for coating or printing on a substrate and/or a substrate surface includes at least one monofunctional acrylate monomer/methacrylate monomer having a substituted or unsubstituted monocycloaliphatic hydrocarbon radical, at least one vinyl monomer having a substituted or unsubstituted heterocyclic radical, where the heterocyclic radical has at least one ring-forming nitrogen atom, at least one monofunctional acrylate monomer/methacrylate monomer having a substituted or unsubstituted bicyclic, nonaromatic hydrocarbon radical and at least one photoinitiator, wherein the UV-curable composition is free of at least one monofunctional acrylate monomer/methacrylate monomer having a substituted or unsubstituted heterocyclic, nonaromatic radical.