Cycloolefin Copolymer Composition for Higher Breakdown Voltage

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Solution Overview

Problem

Conventional norbornene-based polymers do not adequately increase breakdown voltage for use as electrically insulating materials.

Innovation Solution

A cycloolefin ring-opened copolymer is developed with specific proportions of structural units derived from norbornene compounds containing heteroelement-containing and heteroelement-free hydrocarbon groups, optimizing the content between 0.01 mol% and 15.00 mol% to enhance breakdown voltage.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If conventional norbornene-based polymers are used, then heat resistance is achieved, but breakdown voltage is insufficient

Engineering Contradiction:

Improvebreakdown voltageVSAvoidelectrical insulating performance

Core Design Contradiction:

ReliabilityVSAdaptability or versatility

Solution Approach 1:

The patent applies parameter changes by precisely controlling the molar ratio of heteroelement-containing structural units (0.01-15.00 mol%) in the copolymer composition. This quantitative parameter adjustment optimizes the breakdown voltage by modifying the chemical composition parameters of the norbornene-based copolymer, transforming it from insufficient to sufficient electrical insulating performance.

Inventive Principle:

Principle #35Parameter changes

Solution Approach 2:

The patent employs composite materials by creating a copolymer that integrates two distinct structural units: heteroelement-containing units (providing high breakdown voltage) and heteroelement-free units (providing heat resistance). This composite structure combines the advantages of both components to achieve superior overall electrical insulating performance.

Inventive Principle:

Principle #40Composite materials

2Reliability

If heteroelement-containing structural units are increased to improve breakdown voltage, then electrical insulating performance improves, but heat resistance may be compromised

Engineering Contradiction:

Improvebreakdown voltageVSAvoidheat resistance

Core Design Contradiction:

ReliabilityVSTemperature

Solution Approach 1:

The patent resolves this contradiction through parameter changes by establishing an optimal molar ratio range (0.01-15.00 mol%) for heteroelement-containing structural units. This precise parameter control ensures sufficient breakdown voltage while maintaining the heat resistance properties provided by the norbornene skeleton and heteroelement-free units.

Inventive Principle:

Principle #35Parameter changes

Solution Approach 2:

The patent applies local quality by distributing heteroelement-containing structural units at specific proportions within the copolymer matrix. This localized incorporation ensures that the regions providing high breakdown voltage are optimally positioned without compromising the overall heat resistance of the material.

Inventive Principle:

Principle #3Local quality

Data Source

PatentUS12428521B2Cycloolefin ring-opened copolymer, composition for electrically insulating material, and electrically insulating material

Publication Date: 2025.09.30 ZEON CORP

AI summary

A cycloolefin ring-opened copolymer includes a structural unit derived from a norbornene compound that includes a heteroelement-containing hydrocarbon group and a structural unit derived from a norbornene compound that includes a heteroelement-free hydrocarbon group. In this copolymer, the structural unit derived from the norbornene compound that includes the heteroelement-containing hydrocarbon group has a proportional content of not less than 0.01 mol % and not more than 15.00 mol % when all structural units included in the copolymer are taken to be 100 mol %.