Chemically Resistant Epoxy Composition with Reduced RDGE Content

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Solution Overview

Problem

Existing epoxy resins with high resorcinol diglycidyl ether (RDGE) content face issues of crystallization and skin irritation, while maintaining high chemical resistance is desirable.

Innovation Solution

A chemically resistant epoxy resin composition comprising resorcinol diglycidyl ether, cresol novolak epoxy, and epoxy-functional p-hydroxystyrene, with RDGE content minimized to less than 60%, achieving excellent chemical resistance and reduced viscosity for coating applications.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If high RDGE content is used in epoxy resin, then chemical resistance is improved, but crystallization risk and skin irritation increase

Engineering Contradiction:

Improvechemical resistanceVSAvoidcrystallization risk and skin irritation

Core Design Contradiction:

ReliabilityVSObject-affected harmful factors

Solution Approach 1:

The patent changes the concentration parameter of RDGE from high (60-80%) to optimized range (45-57%), and introduces additional epoxy components (cresol novolak epoxy and epoxy-functional p-hydroxystyrene) to maintain chemical resistance while reducing RDGE-related harmful effects

Inventive Principle:

Principle #35Parameter changes

Solution Approach 2:

The patent creates a composite epoxy system combining multiple epoxy components (RDGE, cresol novolak epoxy, and epoxy-functional p-hydroxystyrene) to achieve synergistic effects that maintain chemical resistance while reducing the concentration of problematic RDGE

Inventive Principle:

Principle #40Composite materials

2Reliability

If high RDGE content is used in epoxy resin, then chemical resistance is improved, but skin irritation increases

Engineering Contradiction:

Improvechemical resistanceVSAvoidskin irritation

Core Design Contradiction:

ReliabilityVSObject-affected harmful factors

Solution Approach 1:

The patent reduces the RDGE concentration parameter from high levels (60-80%) to an optimized range (45-57%), thereby decreasing skin irritation potential while maintaining chemical resistance through the combined epoxy system

Inventive Principle:

Principle #35Parameter changes

3Object-affected harmful factors

If RDGE content is reduced in epoxy resin, then crystallization risk is reduced, but chemical resistance may be compromised

Engineering Contradiction:

Improvecrystallization riskVSAvoidchemical resistance

Core Design Contradiction:

Object-affected harmful factorsVSReliability

Solution Approach 1:

The patent employs a composite epoxy formulation where cresol novolak epoxy (20-40%) and epoxy-functional p-hydroxystyrene (1-10%) work synergistically with reduced RDGE (45-57%) to maintain chemical resistance while lowering crystallization risk associated with high RDGE content

Inventive Principle:

Principle #40Composite materials

Solution Approach 2:

The patent assigns different functional roles to different epoxy components: RDGE provides chemical resistance, cresol novolak epoxy contributes to viscosity control and chemical resistance, and epoxy-functional p-hydroxystyrene enhances performance while reducing crystallization tendency, creating localized functional optimization

Inventive Principle:

Principle #3Local quality

Data Source

PatentUS20250320378A1Chemically resistant epoxy composition

Publication Date: 2025.10.16 ADVANCED POLYMER COATINGS INC

AI summary

An epoxy resin for use in chemically resistant two component epoxy linings and composites is produced through the reaction of resorcinol, cresol novolak and polyhydoxystyrene with epichlorohydrin and subsequent reaction with caustic. The ratio of the three components is optimized to give the lining excellent chemical resistance, good crystallization resistance, acceptable viscosity for use in epoxy linings while minimizing the cost of the epoxy resin.