Method for preparing a thermoplastic composition

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Solution Overview

Problem

Balancing biodegradability, thermoplasticity, and material properties in cellulose and hemicellulose-based thermoplastic materials is challenging.

Innovation Solution

A method for preparing a thermoplastic composition by reacting a cyclic ester monomer with cellulose and/or hemicelluloses, resulting in grafted cellulose and/or hemicelluloses that form a thermoplastic composition with improved properties.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If cellulose and hemicellulose are used as thermoplastic materials, then biodegradability is improved, but thermoplasticity and material properties deteriorate

Engineering Contradiction:

ImprovebiodegradabilityVSAvoidthermoplasticity

Core Design Contradiction:

ReliabilityVSStrength

Solution Approach 1:

The patent creates a composite material system by grafting cyclic ester monomers onto cellulose and hemicellulose chains. This forms a hybrid polymer structure where the natural polymer backbone provides biodegradability while the grafted synthetic ester groups confer thermoplasticity. The resulting grafted polymer combines properties of both natural and synthetic polymers to resolve the contradiction between biodegradability and thermoplastic processing capability.

Inventive Principle:

Principle #40Composite materials

Solution Approach 2:

The patent modifies the chemical parameters of cellulose and hemicellulose by introducing graft chains with controllable length and density. By adjusting the degree of substitution and molecular weight of grafted ester groups, the material properties can be tuned to achieve both adequate thermoplasticity for processing and retained biodegradability, thus changing the parameters to satisfy both requirements simultaneously.

Inventive Principle:

Principle #35Parameter changes

2Strength

If cyclic ester monomer is grafted onto cellulose and hemicelluloses, then thermoplasticity is improved, but biodegradability may deteriorate

Engineering Contradiction:

ImprovethermoplasticityVSAvoidbiodegradability

Core Design Contradiction:

StrengthVSReliability

Solution Approach 1:

The patent applies partial grafting where not all hydroxyl groups of cellulose and hemicellulose are substituted with cyclic ester monomers. By controlling the degree of substitution to be partial rather than complete, the material retains enough of its natural polymer structure to maintain biodegradability while acquiring sufficient thermoplastic properties from the grafted groups to enable thermoplastic processing.

Inventive Principle:

Principle #16Partial or excessive action

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 resulting thermoplastic composition is biodegradable, with adjustable grafting levels that can enhance barrier properties and recyclability, while maintaining suitable material properties such as melting temperature.

Implementation Method 1

reacting a cyclic ester monomer with cellulose and/or hemicelluloses, thereby grafting the cellulose and/or hemicelluloses with the cyclic ester monomer

Methodology Applied

Scientific EffectEsterification: Chemical Bonding

Data Source

PatentUS20250179253A1Method for preparing a thermoplastic composition

Publication Date: 2025.06.05 UPM KYMMENE OYJ

AI summary

A method for preparing a thermoplastic composition comprising grafted cellulose and/or hemicelluloses is disclosed. The method may comprise reacting a cyclic ester monomer with cellulose and/or hemicelluloses, thereby grafting the cellulose and/or hemicelluloses with the cyclic ester monomer at least partially, and thereby forming the thermoplastic composition.