Biodegradable Polyester Resin Heat Resistance

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Solution Overview

Problem

Conventional biodegradable polyester resins face limitations in heat resistance, mechanical properties, and color value, with PBAT resin being costly and having inferior properties, while homopolyesters with isosorbide face challenges in forming high viscosity resins due to low reactivity.

Innovation Solution

A biodegradable polyester resin is developed by copolymerizing adipic acid or its ester with anhydrosugar alcohol and anhydrosugar alcohol-alkylene glycol in specific proportions, enhancing heat resistance, mechanical properties, and biodegradability.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Temperature

If isosorbide is used as a comonomer to improve heat resistance, then heat resistance is improved, but reactivity is low making it difficult to form high viscosity resin

Engineering Contradiction:

Improveheat resistanceVSAvoidreactivity

Core Design Contradiction:

TemperatureVSEase of manufacture

Solution Approach 1:

The patent uses a composite diol system combining isosorbide (providing heat resistance) with alkylene glycol (providing reactivity). This composite approach allows the resin to achieve both high heat resistance and sufficient reactivity for forming high viscosity products, resolving the contradiction between heat resistance improvement and manufacturing ease.

Inventive Principle:

Principle #40Composite materials

Solution Approach 2:

The patent optimizes the molar ratio parameters of isosorbide and alkylene glycol in the diol component to achieve the desired balance between heat resistance and reactivity. By carefully controlling these compositional parameters, the resin attains both improved thermal properties and adequate reaction activity for high viscosity formation.

Inventive Principle:

Principle #35Parameter changes

2Reliability

If PBAT resin is used as a biodegradable polyester, then biodegradability is achieved, but price is high and heat resistance and mechanical properties are inferior

Engineering Contradiction:

ImprovebiodegradabilityVSAvoidheat resistance

Core Design Contradiction:

ReliabilityVSTemperature

Solution Approach 1:

The patent creates a composite polyester system combining adipic acid (aliphatic component providing biodegradability) with aromatic dicarboxylic acid and isosorbide (providing heat resistance). This composite structure achieves both biodegradability and improved heat resistance, overcoming the limitations of conventional PBAT resin.

Inventive Principle:

Principle #40Composite materials

Solution Approach 2:

The patent introduces aromatic dicarboxylic acid units into the polyester chain to locally enhance heat resistance properties while maintaining the overall biodegradable character of the aliphatic polyester backbone. This local quality modification allows simultaneous achievement of biodegradability and heat resistance.

Inventive Principle:

Principle #3Local quality

3Strength

If aromatic dicarboxylic acid is increased to improve mechanical properties, then mechanical properties improve, but color value deteriorates

Engineering Contradiction:

Improvemechanical propertiesVSAvoidcolor value

Core Design Contradiction:

StrengthVSObject-affected harmful factors

Solution Approach 1:

The patent optimizes the molar ratio of aromatic to aliphatic dicarboxylic acid within a specific range (30-70 mol% aromatic) to achieve the desired balance between mechanical properties and color value. This parameter optimization ensures adequate structural strength while minimizing yellowing and color degradation.

Inventive Principle:

Principle #35Parameter changes

Solution Approach 2:

The patent uses a composite dicarboxylic acid system combining aromatic and aliphatic components, where the aliphatic adipic acid acts as a color-stabilizing component that counterbalances the yellowing tendency of aromatic acid units, while still providing sufficient mechanical strength through the aromatic component.

Inventive Principle:

Principle #40Composite materials

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 resin achieves improved heat resistance, mechanical properties, and biodegradability with excellent color value, suitable for various applications.

Implementation Method 1

it is possible to increase the glass transition temperature of a polymer such as polyester, PET, polycarbonate, polyurethane and epoxy resin

Methodology Applied

Scientific EffectGlass transition:

Implementation Method 2

to improve the strength of these materials

Methodology Applied

Scientific EffectPolymer reinforcement:

Implementation Method 3

by copolymerizing a dicarboxylic component comprising an adipic acid or an ester thereof and a diol component comprising an anhydrosugar alcohol and anhydrosugar alcohol-alkylene glycol

Methodology Applied

Scientific EffectCopolymerization:

Data Source

PatentEP4053185B1Biodegradable copolymer polyester resin comprising anhydrosugar alcohol and anhydrousugar alcohol-alkylene glycol and method for preparing same

Publication Date: 2026.01.21 SAMYANG CORP

AI summary

The present invention relates to a biodegradable copolymer polyester resin comprising an anhydrosugar alcohol and an anhydrousugar alcohol-alkylene glycol and a method for preparing same and, more specifically, to a polyester resin and a method for preparing same, wherein the polyester resin is excellent in color value and biodegradability as well as heat resistance and mechanical properties, by copolymerizing specific contents of a dicarboxyl component containing adipic acid or an ester thereof and a diol component containing an anhydrosugar alcohol and an anhydrosugar alcohol-alkylene glycol.