Acrylamide Gel Nail Composition Reduces Skin Sensitization

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Solution Overview

Problem

Existing gel nail compositions using (meth)acrylate ester compounds suffer from yellow discoloration, skin irritation, and skin sensitization due to their absorption of UV-LED light in the 365 to 405 nm range, leading to issues with odor and toxicity.

Innovation Solution

A composition incorporating an acrylamide compound A1 with an ester structure, a multi-functional polymerizable compound B1 with an SI value of 3 or less, and a polymerization initiator C1 without a maximum absorption peak in the 365 to 405 nm range, along with a hydrogen donor, to enhance curability, water-resistance, and reduce skin sensitization.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If (meth)acrylate ester compounds are used in gel nail compositions, then the composition achieves photopolymerizability and fluidity, but it causes yellow discoloration, skin irritation, and skin sensitization due to UV-LED light absorption

Engineering Contradiction:

ImprovephotopolymerizabilityVSAvoidskin sensitization

Core Design Contradiction:

ReliabilityVSObject-affected harmful factors

Solution Approach 1:

The patent changes the chemical structure parameters by replacing (meth)acrylate ester compounds with acrylamide compounds having specific ester structures ( formulas 1 and 2). This structural parameter change eliminates the harmful UV absorption property while maintaining the necessary photopolymerizability, thereby resolving the skin sensitization issue without sacrificing curing functionality.

Inventive Principle:

Principle #35Parameter changes

Solution Approach 2:

The patent creates a composite composition by combining acrylamide compound A1 with specific multi-functional polymerizable compounds B1 and polymerization initiators C1. This composite approach achieves both photopolymerizability and safety by selecting components that do not cause skin sensitization, while maintaining the necessary chemical reactivity for curing.

Inventive Principle:

Principle #40Composite materials

2Productivity

If UV-LED light in the 365 to 405 nm range is used for curing, then the composition achieves rapid curing, but it causes yellow discoloration and toxicity due to absorption by (meth)acrylate ester compounds

Engineering Contradiction:

Improvecuring speedVSAvoidyellow discoloration

Core Design Contradiction:

ProductivityVSObject-generated harmful factors

Solution Approach 1:

The patent changes the optical parameters of the composition by replacing UV-absorbing (meth)acrylate ester compounds with acrylamide compounds that do not absorb UV-LED light in the 365 to 405 nm range. This parameter change allows rapid curing to proceed without causing yellow discoloration or toxicity, as the new compound structure is optically transparent to the curing wavelength.

Inventive Principle:

Principle #35Parameter changes

3Ease of operation

If conventional gel nail compositions are used, then the composition provides basic nail decoration functionality, but it suffers from odor and toxicity issues

Engineering Contradiction:

Improvenail decoration functionalityVSAvoidodor and toxicity

Core Design Contradiction:

Ease of operationVSObject-generated harmful factors

Solution Approach 1:

The patent changes the chemical composition parameters by substituting conventional (meth)acrylate ester compounds with acrylamide compounds having specific ester structures. This parameter change eliminates odor and toxicity while preserving the essential nail decoration functionality through maintained photopolymerizability and fluidity properties.

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 high curability, water-resistance, and reduced skin sensitization with minimal yellow discoloration, using UV-LED irradiation with an integrated light quantity of 2.0 J/cm2 or less, improving production efficiency and safety.

Implementation Method 1

a polymerization initiator C1 having no maximum absorption peak in a wavelength range of from 365 to 405 nm

Methodology Applied

Scientific EffectPhotopolymerisation: Photopolymerisation

Implementation Method 2

a hydrogen donor D

Methodology Applied

Scientific EffectHydrogen transfer: Hydrogenation

Data Source

PatentUS11479622B2Active energy ray curable composition, active energy ray curable ink, composition accommodating container, two or three dimensional image forming apparatus, two or three dimensional image forming method, cured matter, decorative matter, artificial nail composition, nail decorative material, and artificial nail

Publication Date: 2022.10.25 RICOH CO LTD

AI summary

An active energy ray curable composition contains an acrylamide compound A1 represented by the following Chemical formula 1 or the following Chemical formula 2;a multi-functional polymerizable compound B1 having an SI value of 3 or less in a skin sensitivity test;a polymerization initiator C1 having no maximum absorption peak in a wavelength range of from 365 to 405 nm; anda hydrogen donor D,