Polyamine Production from Thiourethane Resin Waste Recovery

Resolve Bottlenecks,
Find Innovative SolutionsGenerate Solutions

Solution Overview

Problem

The disposal of cut powder and defective formed/processed articles containing thiourethane resin in lens production is inefficient, as they are not effectively utilized, and there is a need for a method to produce polyamine compounds using thiourethane resin as a starting material.

Innovation Solution

A method involving the reaction of thiourethane resin with amine compounds to generate polyurea and polyamine compounds, including steps such as sieving, washing, and temperature-controlled reactions to produce polyamine compounds suitable for use in producing new polyisocyanate compounds.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Loss of substance

If cut powder containing thiourethane resin is disposed of without utilization, then waste management is simplified, but material loss increases and environmental sustainability deteriorates

Engineering Contradiction:

Improvethiourethane resinVSAvoidwaste disposal process

Core Design Contradiction:

Loss of substanceVSEase of manufacture

Solution Approach 1:

The patent recovers thiourethane resin from cut powder waste through a two-step chemical process: first reacting the cut powder with amine compound A to form polyurea, then reacting with amine compound B to produce polyamine compounds. This transforms waste material into valuable chemical products, directly addressing the contradiction by recovering substance while maintaining process feasibility

Inventive Principle:

Principle #34Discarding and recovering

Solution Approach 2:

The invention converts the harmful aspect of waste disposal into a beneficial chemical transformation process. The cut powder that would normally be discarded is transformed through controlled chemical reactions into useful polyamine compounds, turning a waste management problem into a resource recovery opportunity

Inventive Principle:

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

2Loss of substance

If defective formed articles containing thiourethane resin are disposed of without utilization, then quality control is simplified, but material loss increases

Engineering Contradiction:

Improvethiourethane resinVSAvoidquality control process

Core Design Contradiction:

Loss of substanceVSManufacturing precision

Solution Approach 1:

The patent extends the recovery process to defective formed articles, not just cut powder. By applying the same chemical transformation process (reaction with amine compounds A and B), defective articles are converted into polyamine compounds, recovering valuable material that would otherwise be lost due to quality control requirements

Inventive Principle:

Principle #34Discarding and recovering

3Productivity

If polyamine compounds are produced from thiourethane resin waste, then material recycling efficiency improves, but process complexity increases

Engineering Contradiction:

Improvematerial recycling efficiencyVSAvoidchemical reaction process

Core Design Contradiction:

ProductivityVSDevice complexity

Solution Approach 1:

The patent divides the complex recycling process into two distinct sequential steps: Step 1 (reaction with amine compound A to form polyurea) and Step 2 (reaction with amine compound B to form polyamine). This segmentation makes the overall complex process more manageable, controllable, and scalable, addressing the contradiction between recycling efficiency and process complexity

Inventive Principle:

Principle #1Segmentation

4Loss of substance

If conventional disposal methods are used for thiourethane resin waste, then production cost is reduced, but environmental sustainability deteriorates

Engineering Contradiction:

Improvethiourethane resinVSAvoidenvironmental sustainability

Core Design Contradiction:

Loss of substanceVSLoss of energy

Solution Approach 1:

The patent fundamentally changes the parameter of waste treatment from simple disposal to chemical transformation. By changing the treatment parameter from physical disposal to chemical reaction (with specific amine compounds under controlled conditions), the process achieves both material recovery and environmental sustainability, resolving the contradiction between cost reduction and sustainability

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

This method enables the effective recycling and utilization of thiourethane resin waste by converting it into valuable polyamine compounds, which can be used to produce new thiourethane resins, reducing waste and enhancing material efficiency.

Implementation Method 1

a first step of generating a polyurea compound by reacting a thiourethane resin and an amine compound A with each other

Methodology Applied

Scientific EffectChemical reaction: Chemical Bonding

Implementation Method 2

a second step of generating a polyamine compound by reacting the polyurea compound and an amine compound B with each other

Methodology Applied

Scientific EffectChemical reaction: Chemical Bonding

Data Source

PatentUS20260015320A1Method of producing polyamine compound and application thereof

Publication Date: 2026.01.15 MITSUI CHEMICALS INC

AI summary

A method of producing a polyamine compound, the method including: a first step of generating a polyurea compound by reacting a thiourethane resin and an amine compound A with each other; and a second step of generating a polyamine compound by reacting the polyurea compound and an amine compound B with each other.