Polyol composition, polyurethane resin composition, film, and leather-like sheet

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Solution Overview

Problem

Polycarbonate polyol has high viscosity, requiring large amounts of solvent for handling and resulting in polyurethane products that lack low-temperature flexibility and durability.

Innovation Solution

A polyol composition with a specific structure containing a carbonate group, comprising repeat units (I) and (II), reduces solvent use and enhances low-temperature flexibility and chemical resistance.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If polycarbonate polyol is used to improve heat resistance, chemical resistance, and hydrolysis resistance, then durability is improved, but viscosity increases requiring large amounts of solvent

Engineering Contradiction:
ImprovedurabilityVSAvoidviscosity
Core Design Contradiction:
ReliabilityVSEase of operation

Solution Approach 1:

The patent uses a block copolymer structure combining polycarbonate diol blocks (providing durability) and polyether soft segments (providing low viscosity and flexibility). This composite molecular structure allows the material to simultaneously achieve high durability and ease of handling without requiring large amounts of solvent

Inventive Principle:
Principle #40Composite materials

2Reliability

If polycarbonate polyol is used to improve heat resistance and weather resistance, then durability is improved, but low-temperature flexibility deteriorates

Engineering Contradiction:
Improveheat resistanceVSAvoidlow-temperature flexibility
Core Design Contradiction:
ReliabilityVSAdaptability or versatility

Solution Approach 1:

The patent creates different regions within the polymer chain with different properties: hard polycarbonate segments provide heat resistance and durability, while soft polyether segments provide low-temperature flexibility. This local differentiation of material properties within the same polymer allows simultaneous achievement of both requirements

Inventive Principle:
Principle #3Local quality

3Reliability

If polycarbonate polyol is used alone to achieve best durability, then chemical resistance is improved, but solvent consumption increases

Engineering Contradiction:
Improvechemical resistanceVSAvoidsolvent amount
Core Design Contradiction:
ReliabilityVSQuantity of substance

Solution Approach 1:

The patent changes the molecular weight parameters and structural composition of the polyol, using specifically designed block copolymers with controlled polycarbonate content and molecular weight distribution. This allows achieving high chemical resistance with lower viscosity, thereby reducing solvent requirements while maintaining performance

Inventive Principle:
Principle #35Parameter changes

Data Source

PatentEP4079782B1Polyol composition, polyurethane resin composition, film, and leather-like sheet
Publication Date: 2025.10.01 ASAHI KASEI KOGYO KABUSHIKI KAISHA

AI summary

Provided is a carbonate group-containing polyol composition that is capable of reducing the amount of a solvent used at the time of coating material or polyurethane production, and can produce polyurethane excellent in low-temperature flexibility, chemical resistance (e.g., oleic acid resistance) and abrasion resistance. The present invention provides a carbonate group-containing polyol composition having a number-average molecular weight of 300 to 10000 and comprising a constituent unit (I): a repeat unit represented by -(R11-O-CO-O)n11- and a constituent unit (II): at least one selected from the group consisting of a repeat unit represented by -(R21-O)n21- and a repeat unit represented by - (R31-CO-O)n31-, wherein based on the total mass of the constituent unit (I) and the constituent unit (II), a content of the constituent unit (II) is 1% by mass or more and 99% by mass or less.