Antistatic Resin Composition with Controlled Viscosity and Solubility

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Solution Overview

Problem

Existing antistatic resin compositions either fail to provide sufficient permanent antistatic properties, compromise mechanical properties, or require excessive amounts of metal fillers, leading to decreased impact resistance and surface irregularities.

Innovation Solution

An antistatic resin composition with a specific melt viscosity ratio and solubility parameter difference between the thermoplastic resin and antistatic agent, which allows for effective dispersion and surface concentration of the antistatic agent without impairing mechanical or aesthetic properties.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If a low molecular weight surfactant is added to impart antistatic property, then antistatic effect is achieved, but surface irregularity occurs with time and antistatic effect is lost due to surface cleaning

Engineering Contradiction:

Improveantistatic propertyVSAvoiddurability of antistatic effect

Core Design Contradiction:

ReliabilityVSDuration of action of stationary object

Solution Approach 1:

The patent changes the molecular weight parameter of the surfactant from low molecular weight to high molecular weight. This parameter change prevents the surfactant from bleeding out to the surface, thereby maintaining both the antistatic property and surface smoothness over time without loss of effect due to cleaning

Inventive Principle:

Principle #35Parameter changes

Solution Approach 2:

The patent replaces the short-living low molecular weight surfactant that degrades and bleeds out with a long-living high molecular weight surfactant that provides durable antistatic protection. This substitution transforms a temporary solution into a permanent one, eliminating the need for reapplication or surface cleaning that would remove the antistatic effect

Inventive Principle:

Principle #27Cheap short-living objects (Disposable)

2Reliability

If a large amount of metal filler is added to achieve excellent long-lasting antistatic effect, then antistatic property is improved, but impact resistance decreases

Engineering Contradiction:

Improveantistatic propertyVSAvoidimpact resistance

Core Design Contradiction:

ReliabilityVSStrength

Solution Approach 1:

The patent uses a high molecular weight surfactant as an intermediary substance that provides antistatic properties without the need for metal fillers. This intermediary material achieves the desired electrical conductivity and antistatic effect while maintaining the mechanical integrity and impact resistance of the molded article

Inventive Principle:

Principle #24Intermediary (Mediator)

Solution Approach 2:

The patent replaces the mechanical reinforcement approach (adding metal fillers) with a chemical approach (using high molecular weight surfactant). This substitution eliminates the need for heavy metal particles that compromise impact resistance while achieving the same antistatic function through molecular-level electrical conductivity

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

3Reliability

If PEEAM is added in an amount of above 10% to achieve acceptable antistatic property, then antistatic effect is improved, but mechanical property is degraded

Engineering Contradiction:

Improveantistatic propertyVSAvoidmechanical property

Core Design Contradiction:

ReliabilityVSStrength

Solution Approach 1:

The patent changes the molecular weight parameter of the surfactant, which fundamentally alters the concentration requirements. High molecular weight surfactants provide effective antistatic properties at much lower concentrations compared to PEEAM, thereby avoiding the mechanical property degradation that occurs at high PEEAM loadings

Inventive Principle:

Principle #35Parameter changes

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 composition achieves excellent permanent antistatic properties with reduced antistatic agent content, maintaining mechanical and aesthetic integrity of the molded articles.

Implementation Method 1

an absolute value of a difference between solubility parameters (SPs) of the antistatic agent (A) and the thermoplastic resin (B) is 1.0-3.0

Methodology Applied

Scientific EffectSolubility parameter compatibility: Solvation

Implementation Method 2

a melt viscosity ratio of the thermoplastic resin (B) to the antistatic agent (A) at 220° C. is 0.5-5

Methodology Applied

Scientific EffectViscosity ratio control:

Data Source

PatentUS8859647B2Antistatic resin composition

Publication Date: 2014.10.14 SANYO CHEM IND LTD

AI summary

An antistatic resin composition is provided, from which a thermoplastic resin molded article having a sufficient permanent antistatic property without impairing an excellent mechanical property or a good appearance of the molded article, even in a case that the content of an antistatic agent contained in the composition is less than that in a conventional composition, is provided. The antistatic resin composition contains an antistatic agent (A) and a thermoplastic resin (B), in which a melt viscosity ratio of the thermoplastic resin (B) to the antistatic agent (A) at 220° C. is 0.5-5 and an absolute value of a difference between solubility parameters (SPs) of the antistatic agent (A) and the thermoplastic resin (B) is 1.0-3.0. The antistatic resin molded article is obtained by molding the antistatic resin composition.