Mixed Ester Terephthalate Plasticizers for Faster Cable Insulation Drying

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Solution Overview

Problem

Existing trimellitate ester plasticizers for electrical wire insulation are costly and difficult to process, with high dry times, while achieving the required tensile properties for 90°C or 105°C ratings.

Innovation Solution

A mixed ester terephthalate-based PVC formulation comprising specific compounds of formulas I, II, and III, with additives like antioxidants and stabilizers, enhances tensile strength retention and reduces dry times.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If trimellitate ester plasticizers are used for 90°C or 105°C rating insulation, then tensile strength retention after aging is improved, but cost increases and processing difficulty increases

Engineering Contradiction:

Improvetensile strength retention after agingVSAvoidprocessing difficulty

Core Design Contradiction:

ReliabilityVSEase of manufacture

Solution Approach 1:

The patent uses a composite plasticizer system combining multiple ester types (phthalate esters, trimellitate esters, and terephthalate esters) in specific ratios to achieve the tensile strength retention of trimellitate esters while improving processability and reducing costs associated with using 100% trimellitate esters

Inventive Principle:

Principle #40Composite materials

Solution Approach 2:

The patent modifies the plasticizer composition parameters by specifying weight ratio ranges (phthalate ester 20-40%, trimellitate ester 10-30%, terephthalate ester 30-50%) to optimize the balance between aging performance and processing characteristics

Inventive Principle:

Principle #35Parameter changes

2Reliability

If trimellitate ester plasticizers are used for 90°C or 105°C rating insulation, then permanence is improved through low migration and low volatility, but dry time increases

Engineering Contradiction:

ImprovepermanenceVSAvoiddry time

Core Design Contradiction:

ReliabilityVSLoss of time

Solution Approach 1:

The patent adjusts the chemical composition parameters by incorporating terephthalate esters with specific molecular structures that evaporate more readily than trimellitate esters, thereby reducing dry time while maintaining permanence through the combined action of all plasticizer components

Inventive Principle:

Principle #35Parameter changes

Solution Approach 2:

The multi-component plasticizer system allows different esters to perform different functions: phthalate esters provide plasticizing efficiency, trimellitate esters provide permanence, and terephthalate esters adjust drying characteristics, achieving overall optimization

Inventive Principle:

Principle #40Composite materials

3Reliability

If trimellitate ester plasticizers are used, then low migration and low volatility are achieved for permanence, but cost increases

Engineering Contradiction:

ImprovepermanenceVSAvoidcost

Core Design Contradiction:

ReliabilityVSQuantity of substance

Solution Approach 1:

The patent creates a cost-effective composite plasticizer system that uses trimellitate esters at reduced levels (10-30%) combined with more economical phthalate and terephthalate esters, achieving required permanence at lower overall cost than using 100% trimellitate esters

Inventive Principle:

Principle #40Composite materials

Solution Approach 2:

The patent incorporates more cost-efficient ester components (phthalate esters at 20-40% and terephthalate esters at 30-50%) that, while individually less permanent than trimellitate esters, collectively provide adequate permanence at reduced material cost

Inventive Principle:

Principle #27Cheap short-living objects (Disposable)

Data Source

PatentEP3990534B1Mixed ester terephthalate compositions useful as plasticizers

Publication Date: 2025.12.10 EASTMAN CHEM CO

AI summary

The present application discloses mixed ester terephthalate plasticizer compositions comprising: a compound of formula (I):, a compound of formula (II) :, and a compound of formula (III):, wherein R1, R2, and n are defined herein. The present application also discloses resin compositions, insulation layers and cables comprising the plasticizer compositions.