Isophthalate-Epoxy Plasticizer Composition for Low-Migration PVC Resin

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Solution Overview

Problem

Existing plasticizers for PVC resin, such as diethylhexylterephthalate, exhibit low plasticizing efficiency, poor light resistance, and high migration, necessitating the development of a novel composition with improved properties.

Innovation Solution

A plasticizer composition comprising isophthalate-based materials and epoxy-based alkyl ester compounds, with specific weight ratios and carbon atom configurations, is formulated through esterification and trans-esterification processes, enhancing properties like tensile strength, elongation, and migration resistance.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Ease of manufacture

If diethylhexylterephthalate is used as a plasticizer, then cost is reduced, but plasticizing efficiency is low and light resistance is poor

Engineering Contradiction:

ImprovecostVSAvoidplasticizing efficiency

Core Design Contradiction:

Ease of manufactureVSReliability

Solution Approach 1:

The patent uses a composite plasticizer system combining diethylhexyl isophthalate (DEHIP) and epoxidized soybean oil (ESO) in a weight ratio of 90:10 to 20:80. This composite approach leverages the excellent plasticizing efficiency of DEHIP while the ESO component enhances light resistance and reduces migration, achieving superior overall performance compared to single-component plasticizers

Inventive Principle:

Principle #40Composite materials

Solution Approach 2:

The patent optimizes the weight ratio parameters of DEHIP and ESO to achieve the best balance between plasticizing efficiency, light resistance, and migration properties. By adjusting this compositional parameter within the specified range, the plasticizer system can be tuned for different application requirements while maintaining improved performance over conventional plasticizers

Inventive Principle:

Principle #35Parameter changes

2Ease of manufacture

If diethylhexylterephthalate is used as a plasticizer, then cost is reduced, but migration is high

Engineering Contradiction:

ImprovecostVSAvoidmigration

Core Design Contradiction:

Ease of manufactureVSLoss of substance

Solution Approach 1:

The combination of DEHIP and ESO creates a composite plasticizer where ESO acts as a migration inhibitor. The epoxidized oil component forms a more stable interaction with the PVC resin matrix, reducing the tendency of the plasticizer to migrate to the surface or separate from the resin, thereby solving the high migration issue while maintaining cost-effectiveness

Inventive Principle:

Principle #40Composite materials

3Ease of manufacture

If conventional plasticizers are used, then manufacturing is simple, but gelation properties are poor

Engineering Contradiction:

Improvemanufacturing simplicityVSAvoidgelation properties

Core Design Contradiction:

Ease of manufactureVSStability of the object's composition

Solution Approach 1:

The patent modifies the chemical structure parameters of the plasticizer by using isophthalate (with 1,3-substitution pattern) instead of terephthalate (1,4-substitution), and incorporates epoxidized oil components. These structural parameter changes improve gelation properties and compositional stability while maintaining ease of manufacture through standard esterification processes

Inventive Principle:

Principle #35Parameter changes

4Reliability

If phthalate-based plasticizers are used, then plasticizing efficiency is achieved, but harmful effects to humans occur

Engineering Contradiction:

Improveplasticizing efficiencyVSAvoidharmful effects to humans

Core Design Contradiction:

ReliabilityVSObject-affected harmful factors

Solution Approach 1:

The patent extracts and eliminates the harmful phthalate moiety from the plasticizer structure, replacing it with isophthalate and epoxidized oil components. This extraction of the toxic element maintains the desired plasticizing efficiency while removing the harmful effects associated with phthalate-based plasticizers, creating a safer alternative for applications where human exposure is a concern

Inventive Principle:

Principle #2Taking out (Extraction)

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 new plasticizer composition demonstrates improved plasticizing efficiency, tensile strength, elongation, and reduced migration and volatile loss, suitable for resin applications requiring environmentally-friendly materials.

Implementation Method 1

a plasticizer composition consisting of an isophthalate-based material; and an epoxy-based alkyl ester compound wherein a weight ratio of the isophthalate-based material to the epoxy-based alkyl ester compound is 90:10 to 20:80

Methodology Applied

Scientific EffectMixing:

Implementation Method 2

The new plasticizer composition demonstrates improved plasticizing efficiency, tensile strength, elongation, and reduced migration and volatile loss

Methodology Applied

Scientific EffectMigration resistance:

Data Source

PatentEP3327075B1Plasticizer composition, resin composition, and preparation methods therefor

Publication Date: 2025.08.27 LG CHEM LTD

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AI summary

The present invention relates to a plasticizer composition, a resin composition, and a method of preparing the plasticizer composition. A plasticizer composition capable of improving properties such as tensile strength, migration resistance, volatile loss and the like, which are required when used as a plasticizer of a resin composition, by improving poor properties occurring due to structural limitations, and a resin composition including the same may be provided.