TFE-PPVE Copolymer Composition for Smooth Chemical-Resistant Molding

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Solution Overview

Problem

Existing polymers used in forming articles for chemical solution transfer and measurement fail to provide sufficient transparency, high-temperature abrasion resistance, and heat distortion resistance after immersion in chemical solutions, with inadequate surface smoothness and uniform coating thickness.

Innovation Solution

A copolymer composed of tetrafluoroethylene (TFE) and perfluoro(propyl vinyl ether) (PPVE) units, with specific content ratios and melt flow rates, is used to form articles with improved surface smoothness, uniform thickness, and enhanced properties such as 150°C abrasion resistance, oxygen and chemical solution impermeability, and high-temperature rigidity.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Manufacturing precision

If conventional polymers are used for forming articles, then manufacturing is simpler, but surface smoothness and uniform coating thickness are insufficient

Engineering Contradiction:

Improvesurface smoothnessVSAvoidcoating uniformity

Core Design Contradiction:

Manufacturing precisionVSEase of manufacture

Solution Approach 1:

The patent applies parameter changes by precisely controlling the PPVE unit content (2.14-3.00 mol%) and melt flow rate (33.0-49.9 g/10 min at 372°C) of the copolymer. These parameter optimizations enable the material to achieve excellent surface smoothness and uniform coating thickness during injection molding and extrusion forming, directly resolving the contradiction between manufacturing precision and ease of manufacture.

Inventive Principle:

Principle #35Parameter changes

2Reliability

If existing polymers are used, then production cost is lower, but high-temperature abrasion resistance and heat distortion resistance are insufficient

Engineering Contradiction:

Improvehigh-temperature abrasion resistanceVSAvoidchemical solution resistance

Core Design Contradiction:

ReliabilityVSEase of manufacture

Solution Approach 1:

The patent employs composite material principles by creating a TFE/PPVE copolymer with specific compositional ratios. The combination of TFE units providing chemical inertness and PPVE units enhancing mechanical properties results in a material with superior 150°C abrasion resistance, heat distortion resistance after chemical immersion, and overall reliability while maintaining manufacturability.

Inventive Principle:

Principle #40Composite materials

3Productivity

If copolymer with higher melt flow rate is used, then injection molding productivity increases, but coating thickness uniformity decreases

Engineering Contradiction:

Improveinjection molding speedVSAvoidcoating thickness uniformity

Core Design Contradiction:

ProductivityVSManufacturing precision

Solution Approach 1:

The patent applies parameter changes by optimizing the melt flow rate to the specific range of 33.0-49.9 g/10 min at 372°C. This optimized parameter enables high injection molding productivity while maintaining excellent coating thickness uniformity on core wires, resolving the contradiction between production speed and coating precision.

Inventive Principle:

Principle #35Parameter changes

Data Source

PatentEP4299611B1Copolymer, molded body, injection molded body, and coated electrical wire

Publication Date: 2026.03.04 DAIKIN INDUSTRIES LTD

AI summary

There is provided a copolymer containing tetrafluoroethylene unit and perfluoro(propyl vinyl ether) unit, wherein the copolymer has a content of perfluoro(propyl vinyl ether) unit of 2.14 to 3.00 mol% with respect to the whole of the monomer units, a melt flow rate at 372°C of 33.0 to 50.0 g/10 min, and the number of functional groups of 50 or less per 106 main-chain carbon atoms.