UV-Curing Polyester Resin Composition for Alkali-Resistant Adhesion

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Solution Overview

Problem

Existing active energy ray curing compositions fail to maintain strong adhesion after exposure to extreme conditions such as hot water or alkali solutions, which is critical for applications like beverage containers that require durability.

Innovation Solution

Incorporating a polymerizable monomer with a phosphoric acid ester group and a polyester resin with an unsaturated bond into the curing composition, enhancing the interaction and adhesion between the substrate and cured matter.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If conventional active energy ray curing compositions are used, then the curing process is quick and efficient, but the adhesion strength deteriorates after exposure to extreme conditions such as hot water or alkali solutions

Engineering Contradiction:

Improveadhesion strengthVSAvoiddurability under extreme conditions

Core Design Contradiction:

ReliabilityVSObject-affected harmful factors

Solution Approach 1:

The patent uses a composite resin system combining polyester resin with unsaturated bonds and polymerizable monomers containing phosphoric acid ester groups. This composite material structure provides both quick curing capability and enhanced adhesion strength that resists deterioration under extreme conditions like hot water or alkali solution exposure.

Inventive Principle:

Principle #40Composite materials

Solution Approach 2:

The patent specifies precise parameter ranges: polyester resin with number average molecular weight of 500-3000, phosphoric acid ester group content of 3-15 mass%, and unsaturated bond content of 5-20 mass%. These parameter optimizations ensure the cured matter maintains strong adhesion while resisting degradation under extreme environmental conditions.

Inventive Principle:

Principle #35Parameter changes

2Strength

If the composition is designed for strong adhesion, then the interaction with substrate improves, but the resistance to chemical degradation under severe conditions worsens

Engineering Contradiction:

Improveadhesion strengthVSAvoidchemical stability under extreme conditions

Core Design Contradiction:

StrengthVSStability of the object's composition

Solution Approach 1:

The patent converts the typically harmful effects of hot water and alkali solutions into beneficial verification of performance. The phosphoric acid ester group-containing monomers and unsaturated bond-containing polyester resin are specifically designed to maintain adhesion strength even when exposed to these extreme chemical conditions, effectively using the harsh environment as a test of the composition's superior chemical stability.

Inventive Principle:

Principle #22Blessing in disguise (Convert harm into benefit)

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 maintains excellent adhesion and durability even after exposure to hot water or alkali solutions, ensuring the cured matter remains firmly adhered to the substrate.

Implementation Method 1

The active energy ray curing composition cures upon exposure to radiation of active energy rays

Methodology Applied

Scientific EffectPhotopolymerization: Photopolymerisation

Data Source

PatentUS12486418B2Active energy ray curing composition, comprising a polymerizable monomer and a polyester resin

Publication Date: 2025.12.02 RICOH CO LTD

AI summary

An active energy ray curing composition contains a polymerizable monomer having a phosphoric acid ester group and a polyester resin having an unsaturated bond and a number average molecular weight of 3,000 or less.