Aqueous Urethane Resin Primers for Adhesion and Barrier Resistance

Solution Overview

Problem

Existing resin molded products face challenges with poor barrier resistance, adhesion, and blocking resistance, particularly in laminates with deposited films, necessitating materials with improved performance.

Innovation Solution

An aqueous urethane resin composition is developed using a polyester polyol derived from diethylene glycol and/or ethylene glycol, combined with a polyisocyanate compound, achieving an aromatic ring concentration of 1.4 mol/kg or more, which enhances barrier resistance, adhesion, and blocking resistance.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Strength

If a polyolefin resin primer layer is used to improve adhesion, then adhesion is improved, but barrier resistance and blocking resistance become insufficient

Engineering Contradiction:

ImproveadhesionVSAvoidbarrier resistance

Core Design Contradiction:

StrengthVSReliability

Solution Approach 1:

The patent changes the chemical composition parameters of the primer layer by using aqueous urethane resin instead of polyolefin resin, and controls the aromatic ring concentration at 1.4 mol/kg or more to achieve both good adhesion and barrier resistance simultaneously

Inventive Principle:

Principle #35Parameter changes

Solution Approach 2:

The patent creates a composite primer layer system combining aqueous urethane resin with specific aromatic ring structures, achieving a synergistic effect where both adhesion and barrier resistance are improved together

Inventive Principle:

Principle #40Composite materials

2Strength

If a polyolefin resin primer layer is used to improve adhesion, then adhesion is improved, but blocking resistance becomes insufficient

Engineering Contradiction:

ImproveadhesionVSAvoidblocking resistance

Core Design Contradiction:

StrengthVSReliability

Solution Approach 1:

The patent changes the chemical composition parameters of the primer layer by using aqueous urethane resin instead of polyolefin resin, and controls the aromatic ring concentration at 1.4 mol/kg or more to achieve both good adhesion and barrier resistance simultaneously

Inventive Principle:

Principle #35Parameter changes

Solution Approach 2:

The patent creates a composite primer layer system combining aqueous urethane resin with specific aromatic ring structures, achieving a synergistic effect where both adhesion and barrier resistance are improved together

Inventive Principle:

Principle #40Composite materials

Data Source

PatentEP4640727A1Aqueous urethane resin composition, multilayer body and article

Publication Date: 2025.10.29 DIC CORP

AI summary

The invention provides an aqueous urethane resin composition including: (A) a urethane resin made from (a1) a polyol compound and (a2) a polyisocyanate compound as essential raw materials; and (B) an aqueous medium, in which the polyol compound (a1) includes a polyester polyol made from diethylene glycol and/or ethylene glycol as a raw material, and the urethane resin (A) has an aromatic ring concentration of 1.4 mol/kg or more. This aqueous urethane resin composition has excellent barrier resistance, adhesion, and blocking resistance.