Liquid Crystal Polyester Resin Composition for Weld Line Strength

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Solution Overview

Problem

Liquid crystal polyester resin compositions are prone to weak weld lines during injection molding, leading to susceptibility to damage from impact or friction, and they also generate dust and fibrils due to fibrillization, which can impair the performance of electronic components.

Innovation Solution

A liquid crystal polyester resin composition is developed, incorporating a fibril inhibitor, an esterification inhibitor, and fillers, which improves impact strength, weld line impact strength, and reduces dust generation and fibril formation.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Ease of manufacture

If liquid crystal polyester resin composition is injection molded into complex shape, then moldability is improved, but weld lines are formed at interface where resin flows meet

Engineering Contradiction:

ImprovemoldabilityVSAvoidweld line strength

Core Design Contradiction:

Ease of manufactureVSStrength

Solution Approach 1:

The patent changes the chemical composition parameters of the resin by incorporating specific additives (ethylene-methacrylic acid copolymer, phosphite compound, and inorganic fillers) to modify the properties of weld lines and improve their strength while maintaining moldability

Inventive Principle:

Principle #35Parameter changes

Solution Approach 2:

The patent creates a composite material system combining liquid crystal polyester resin with multiple functional additives (fibril inhibitor, esterification inhibitor, fillers) to achieve both good moldability and improved weld line strength simultaneously

Inventive Principle:

Principle #40Composite materials

2Ease of operation

If molded article is subjected to ultrasonic cleaning or friction, then cleaning effect is improved, but fibrillization occurs and dust is generated

Engineering Contradiction:

Improvecleaning effectivenessVSAvoiddust generation

Core Design Contradiction:

Ease of operationVSObject-generated harmful factors

Solution Approach 1:

The patent applies preliminary anti-action by incorporating a fibril inhibitor (ethylene-methacrylic acid copolymer) into the resin composition before molding, which prevents fibrillization from occurring in the first place, thereby eliminating dust generation during subsequent cleaning operations

Inventive Principle:

Principle #9Preliminary anti-action

Solution Approach 2:

The patent converts the potential harmful effect of friction and ultrasonic cleaning into a beneficial outcome by using the mechanical stress from these processes to activate the self-lubricating properties of the phosphite compound and inorganic fillers, which actually protect the surface and reduce dust generation

Inventive Principle:

Principle #22Blessing in disguise (Convert harm into benefit)

3Productivity

If resin composition has high fluidity for thin device molding, then moldability is improved, but weld lines become weaker

Engineering Contradiction:

Improvemolding efficiencyVSAvoidweld line impact strength

Core Design Contradiction:

ProductivityVSStrength

Solution Approach 1:

The patent changes the rheological and mechanical parameters of the resin by adding specific compounds that modify both fluidity and weld line properties, achieving high molding efficiency while maintaining weld line impact strength above 20 J/m

Inventive Principle:

Principle #35Parameter changes

Data Source

PatentUS20250163264A1Liquid crystal polyester resin composition, molded article, and electronic component material comprising the same

Publication Date: 2025.05.22 SE YANG POLYMER

AI summary

The present invention relates to a liquid crystal polyester resin composition, a molded article, and an electronic component material including the same and, more particularly, to a liquid crystal polyester resin composition that has good weld line impact strength and is resistant to dust generation, a molded article, and an electronic component material including the same.