EVOH-Polypropylene Resin Composition With Improved Thermal Stability

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Solution Overview

Problem

EVOH resin compositions containing polypropylene for modification exhibit inferior thermal stability compared to those consisting solely of EVOH, necessitating further improvements.

Innovation Solution

Incorporating a carbon-14-containing polypropylene resin into the EVOH resin composition, with a mass ratio ranging from 10/90 to 99/1, to enhance thermal stability.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Strength

If polypropylene is incorporated into EVOH resin composition for modification, then physical properties and flexibility are improved, but thermal stability deteriorates

Engineering Contradiction:

ImproveflexibilityVSAvoidthermal stability

Core Design Contradiction:

StrengthVSReliability

Solution Approach 1:

The patent changes the chemical composition parameter of polypropylene from conventional petroleum-derived to carbon-14-containing bio-based polypropylene. This parameter change fundamentally alters the thermal decomposition characteristics while maintaining the flexibility improvement function, thereby resolving the contradiction between enhanced flexibility and deteriorated thermal stability.

Inventive Principle:

Principle #35Parameter changes

Solution Approach 2:

The patent creates a composite resin composition by combining EVOH with carbon-14-containing polypropylene in specific ratios (mass ratio of EVOH to polypropylene from 10/90 to 99/1). This composite material approach allows the simultaneous achievement of improved flexibility from polypropylene and maintained thermal stability through the unique properties of carbon-14-containing polymer chains.

Inventive Principle:

Principle #40Composite materials

2Ease of manufacture

If conventional polypropylene is used in EVOH composition, then processing and physical properties are enhanced, but thermal decomposition resistance is reduced

Engineering Contradiction:

ImproveprocessingVSAvoidthermal decomposition

Core Design Contradiction:

Ease of manufactureVSObject-affected harmful factors

Solution Approach 1:

The patent modifies the chemical composition parameter of polypropylene by incorporating carbon-14 isotopes, which fundamentally changes the thermal decomposition behavior. This parameter change increases resistance to thermal decomposition while preserving the ease of processing and physical property enhancement benefits of polypropylene in EVOH compositions.

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 resulting resin composition exhibits improved thermal stability due to the carbon-14-containing polypropylene resin's strong binding energy, leading to slowed decomposition and increased stability.

Implementation Method 1

the carbon-14-containing polypropylene resin exhibits stronger binding energy due to the primary isotope effect, leading to slowed decomposition and increased thermal stability

Methodology Applied

Scientific EffectPrimary isotope effect:

Data Source

PatentEP4692216A1Resin composition, molded body, sheet, film, bottle, tube, container, multilayer structure, and method for producing resin composition

Publication Date: 2026.02.11 MITSUBISHI CHEM CORP

AI summary

Provided is a resin composition comprising an ethylene-vinyl alcohol copolymer and a polypropylene resin having excellent thermal stability. The resin composition comprises an ethylene-vinyl alcohol copolymer (A) and a carbon-14-containing polypropylene resin (B).