Biodegradable Polyester Copolymer for Fast Adhesion in Halogen-Free Solvents

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Solution Overview

Problem

Existing biodegradable adhesives and inks based on polyhydroxyalkanoate resins suffer from issues such as solvent solubility in halogen-based solvents, which are harmful, and require long aging times for adequate adhesion strength, posing environmental and practical challenges.

Innovation Solution

A biodegradable polyester solution containing a poly(3-hydroxybutyrate-co-3-hydroxyhexanoate) copolymer with a specific 3-hydroxyhexanoate content and used in halogen-free organic solvents, ensuring good solubility and rapid adhesion strength development.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If polyhydroxyalkanoate-based resin is used for biodegradability in seawater, then environmental biodegradability is improved, but adhesion strength development time increases

Engineering Contradiction:

Improvebiodegradability in seawaterVSAvoidaging time for adhesion strength

Core Design Contradiction:

ReliabilityVSLoss of time

Solution Approach 1:

The patent changes the chemical composition parameters of the polyester by incorporating specific monomer units (3-hydroxyhexanoate at 1-10 mol%, 4-hydroxybutyrate at 1-10 mol%, and 3-hydroxybutyrate at 80-90 mol%) to achieve both biodegradability and rapid adhesion strength development within 24 hours

Inventive Principle:

Principle #35Parameter changes

Solution Approach 2:

The patent creates a composite polyester material combining multiple monomer units (3-hydroxyhexanoate, 4-hydroxybutyrate, and 3-hydroxybutyrate) in specific proportions to achieve synergistic effects where the composite structure provides both environmental biodegradability and rapid adhesion performance

Inventive Principle:

Principle #40Composite materials

2Stability of the object's composition

If halogen-based solvents are used for good solubility, then solubility is improved, but environmental harm increases

Engineering Contradiction:

ImprovesolubilityVSAvoidenvironmental harm from halogen solvents

Core Design Contradiction:

Stability of the object's compositionVSObject-generated harmful factors

Solution Approach 1:

The patent converts the harmful halogen-based solvents into beneficial halogen-free solvents by adjusting the polyester composition, specifically using 3-hydroxyhexanoate and 4-hydroxybutyrate units that enhance solubility in safe, environmentally friendly solvents while maintaining good dissolving performance

Inventive Principle:

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

Solution Approach 2:

The patent changes the solvent type parameter from halogen-based to halogen-free while maintaining solubility performance by optimizing the polyester's chemical structure with specific monomer ratios that are compatible with safe organic solvents

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

The solution provides a biodegradable adhesive and ink with excellent solubility in safe organic solvents and sufficient adhesion strength within a short time, minimizing environmental impact and improving working conditions.

Implementation Method 1

a biodegradable polyester solution containing: a poly(3-hydroxybutyrate-co-3-hydroxyhexanoate) copolymer; and a halogen-free organic solvent

Methodology Applied

Scientific EffectSolubility: Solvation

Data Source

PatentEP4098699B1Biodegradable polyester solution and use thereof

Publication Date: 2025.10.08 KANEKA CORP

AI summary

An object of an embodiment of the present invention is to provide a biodegradable polyester solution that exhibits good solubility in a halogen-free organic solvent and that has sufficient adhesive strength even when aged for a short time. The object is achieved by providing a biodegradable polyester solution containing a poly(3-hydroxybutyrate-co-3-hydroxyhexanoate) copolymer and a solvent, the poly(3-hydroxybutyrate-co-3-hydroxyhexanoate) copolymer having an average content of 16 mol% or more 3-hydroxyhexanoate.