Condensation Polyurethane Composition for Solvent-Free Epoxy Adhesion

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Solution Overview

Problem

Conventional non-isocyanate polyurethane compositions face challenges in achieving high structural strength, melt processability, and sufficient reactive functional groups for adhesion, often requiring energy-intensive purification processes and organic solvents, which are environmentally unfriendly and pose safety risks.

Innovation Solution

A condensation type polyurethane composition comprising a first and second polyurethane in a specific molar ratio, prepared through a polycondensation process using diamine and carbonate compounds without isocyanate, incorporating urea group-containing compounds to enhance adhesion and structural strength.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Productivity

If addition polymerization process is used to prepare NIPU, then the process is simpler and faster, but high molecular weight products are difficult to obtain and structural strength is not optimal

Engineering Contradiction:

Improvepolymerization speedVSAvoidstructural strength

Core Design Contradiction:

ProductivityVSStrength

Solution Approach 1:

The patent combines two different polymerization approaches: it uses addition polymerization to create polyhydroxyurethane segments with high polymerization speed, then introduces condensation polymerization through polyol to extend molecular chains and achieve high molecular weight. This merging of methods allows both fast production and high structural strength.

Inventive Principle:

Principle #5Merging (Combining)

Solution Approach 2:

The patent creates a composite polyurethane structure containing both polyhydroxyurethane segments (from addition polymerization) and polyol-derived segments (from condensation polymerization). This composite structure leverages the advantages of both polymerization methods to achieve optimal structural strength while maintaining production efficiency.

Inventive Principle:

Principle #40Composite materials

2Strength

If condensation polymerization process is used to prepare NIPU, then high molecular weight and structural strength are achieved, but the process requires multiple steps including purification

Engineering Contradiction:

Improvestructural strengthVSAvoidprocess complexity

Core Design Contradiction:

StrengthVSDevice complexity

Solution Approach 1:

The patent segments the polymerization process into two distinct stages: first, addition polymerization of cyclic carbonate and polyamine to form polyhydroxyurethane oligomers; second, condensation polymerization with polyol to achieve high molecular weight. This segmentation allows each stage to be optimized independently, simplifying the overall process while maintaining high structural strength.

Inventive Principle:

Principle #1Segmentation

3Manufacturing precision

If purification steps are added to NIPU preparation, then product quality is improved, but energy consumption increases and environmental impact worsens

Engineering Contradiction:

Improveproduct qualityVSAvoidenergy consumption

Core Design Contradiction:

Manufacturing precisionVSUse of energy by stationary object

Solution Approach 1:

The patent employs catalysts that enable the polymerization reactions to proceed under mild conditions with inherent selectivity, allowing the system to self-regulate and minimize impurity formation. This self-service approach reduces or eliminates the need for energy-intensive purification steps while maintaining high product quality.

Inventive Principle:

Principle #25Self-service

4Reliability

If organic solvents are used in NIPU preparation, then reactive functional groups are sufficient for adhesion, but industrial safety concerns and liquid waste recycling problems arise

Engineering Contradiction:

Improveadhesion capabilityVSAvoidsafety and environmental hazards

Core Design Contradiction:

ReliabilityVSObject-affected harmful factors

Solution Approach 1:

The patent conducts polymerization reactions in an inert or solvent-free environment, using the reactants themselves as the reaction medium. This eliminates the need for organic solvents, removing safety and environmental hazards while maintaining sufficient reactive functional groups for adhesion through the controlled polymerization process.

Inventive Principle:

Principle #39Inert atmosphere (Inert environment)

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 adhesion strength to epoxy resins and suitable molecular weights, eliminating the need for organic solvents and reducing environmental impact by avoiding energy-intensive purification steps.

Implementation Method 1

prepared through a polycondensation process using diamine and carbonate compounds without isocyanate

Methodology Applied

Scientific EffectPolycondensation:

Implementation Method 2

The hydrogen bonding force between polyurea molecules is very strong

Methodology Applied

Scientific EffectHydrogen bonding:

Data Source

PatentEP4671303A1Condensation type polyurethane composition

Publication Date: 2025.12.31 FAR EASTERN NEW CENTURY COPRRATION

AI summary

A condensation type polyurethane composition includes a first polyurethane represented by Formula (I) and a second polyurethane represented by Formula (II), preferably in a molar ratio of the first polyurethane and to the second polyurethane ranging from 20:80 to 80:20, wherein each of the substituents in Formula (I) and Formula (II) is given the definitions as set forth in the Specification and Claims. In one embodiment, the condensation type polyurethane composition has an amine value of at least 10 meq/kg.