Aromatic Liquid Crystal Polyester Resin Anti-Static Filler

Resolve Bottlenecks,
Find Innovative Solutions
Generate Solutions

Solution Overview

Problem

Wholly aromatic liquid crystalline polyester resins used in electronic products often suffer from appearance defects and reduced mechanical and electrical insulating strength due to foreign materials, dust, or resin powder during the injection process, leading to increased manufacturing costs and reduced price competitiveness.

Innovation Solution

A wholly aromatic liquid crystalline polyester resin compound incorporating an electrically conductive filler, such as carbon black, carbon fiber, or carbon nanotubes, with a surface resistance of 10^7 to 4x10^11 Ω/sq, which prevents foreign materials from adhering and enhances mechanical and electrical properties, while also providing electromagnetic wave shielding.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Manufacturing precision

If foreign material removal equipments such as clean room are used to prevent appearance defects, then product quality is improved, but manufacturing cost increases

Engineering Contradiction:
Improveappearance qualityVSAvoidmanufacturing cost
Core Design Contradiction:
Manufacturing precisionVSEase of manufacture

Solution Approach 1:

The patent applies the 'Blessing in disguise' principle by converting the harmful static electricity that attracts foreign materials into a beneficial anti-static property. By incorporating electrically conductive fillers (carbon black, carbon fiber, metal powder, or conductive inorganic powder) at concentrations of 1-50 wt%, the resin compound develops surface resistance between 10^5-10^12 Ω/sq, which prevents static charge accumulation and thereby repels foreign materials during injection molding, eliminating the need for expensive clean room facilities.

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

2Manufacturing precision

If electrically conductive filler is added to prevent appearance defects, then product quality is improved, but electrical insulating strength deteriorates

Engineering Contradiction:
Improveappearance qualityVSAvoidelectrical insulating strength
Core Design Contradiction:
Manufacturing precisionVSReliability

Solution Approach 1:

The patent applies the 'Parameter changes' principle by precisely controlling the concentration of electrically conductive fillers within 1-50 wt% and adjusting surface resistance to fall within 10^5-10^12 Ω/sq. This parameter optimization creates a balance where the resin compound has sufficient anti-static properties to prevent foreign material adhesion while maintaining adequate electrical insulating strength for electronic product applications. The liquid crystalline polyester resin matrix also contributes to maintaining mechanical and electrical properties despite filler incorporation.

Inventive Principle:
Principle #35Parameter changes

3Productivity

If resin compound is processed using injection to improve productivity, then manufacturing efficiency is improved, but foreign materials attach to products causing appearance defects

Engineering Contradiction:
Improvemanufacturing efficiencyVSAvoidappearance quality
Core Design Contradiction:
ProductivityVSManufacturing precision

Solution Approach 1:

The patent applies the 'Preliminary action' principle by pre-incorporating electrically conductive fillers into the resin compound before the injection molding process. This preliminary addition of conductive agents ensures that the resin compound already possesses anti-static properties prior to processing, preventing foreign material adhesion during injection molding. As a result, high productivity through injection processing is maintained while appearance quality is protected from defects caused by foreign material contamination.

Inventive Principle:
Principle #10Preliminary action

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 use of the conductive filler in the resin compound prevents appearance defects, maintains high mechanical and electrical insulating strength, and allows for effective electromagnetic wave shielding, improving manufacturing efficiency and product quality.

Implementation Method 1

a wholly aromatic liquid crystalline polyester resin compound comprising: a wholly aromatic liquid crystalline polyester resin having a melting point of 300 to 450 °C. and an electrically conductive filler... the wholly aromatic liquid crystalline polyester resin compound has a surface resistance of 10^7 to 4×10^11 Ω/sq

Methodology Applied
Scientific EffectElectrical conduction: Conduction (electrical)

Implementation Method 2

When the wholly aromatic liquid crystalline polyester resin compound is used in manufacturing an electronic product causing electromagnetic waves, the effects of shielding electromagnetic waves may be obtained

Methodology Applied
Scientific EffectElectromagnetic wave shielding: Faraday Cage

Data Source

PatentEP2774952B1Wholly aromatic liquid crystal polyester resin compound and product having antistatic properties
Publication Date: 2019.06.19 SHENZHEN WOTE ADVANCED MATERIALS

AI summary

A wholly aromatic liquid crystalline polyester resin compound and a product are disclosed. The disclosed wholly aromatic liquid crystal polyester resin compound includes a wholly aromatic liquid crystal polyester resin and an electroconductive filter.