Antistatic Multilayer Sheet with Phosphonic Acid Polymer

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Solution Overview

Problem

Conventional gas barrier layers with high surface electrical resistivity fail to provide antistatic performance, leading to issues like static-induced adhesion of powdery substances to packaging materials, which complicates handling and storage.

Innovation Solution

A multilayer structure comprising a base, a layer containing aluminum atoms, and a layer with a polymer having a phosphonic acid unit, where the polymer layer has a specific surface electrical resistivity range and reacts with aluminum atoms to enhance antistatic properties.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If a gas barrier layer containing aluminum or aluminum oxide is formed on a plastic film, then gas barrier properties are improved, but surface electrical resistivity increases (antistatic performance deteriorates)

Engineering Contradiction:

Improvegas barrier propertiesVSAvoidsurface electrical resistivity

Core Design Contradiction:

ReliabilityVSObject-affected harmful factors

Solution Approach 1:

The invention uses a composite structure consisting of a plastic film layer and a gas barrier layer containing aluminum or aluminum oxide. This composite material combines the flexibility and processability of plastic with the superior gas barrier properties of metal/metal oxide, while the plastic film provides the necessary electrical conductivity to prevent static accumulation.

Inventive Principle:

Principle #40Composite materials

Solution Approach 2:

The plastic film acts as an intermediary layer between the gas barrier layer and the external environment. It mediates between the need for high gas barrier performance (provided by the aluminum/aluminum oxide layer) and the need for low surface electrical resistivity (provided by the plastic film), allowing both requirements to be satisfied simultaneously.

Inventive Principle:

Principle #24Intermediary (Mediator)

2Reliability

If a conventional gas barrier layer is used, then gas barrier properties are improved, but powdery substances adhere to the packaging material due to static electricity

Engineering Contradiction:

Improvegas barrier propertiesVSAvoidstatic-induced adhesion

Core Design Contradiction:

ReliabilityVSObject-generated harmful factors

Solution Approach 1:

The invention converts the potentially harmful static electricity effect into a beneficial anti-static effect. By using a plastic film with inherently lower electrical resistivity as the base layer, the packaging material actively dissipates static charges that would otherwise cause powdery substances to adhere, thereby preventing the harmful adhesion effect.

Inventive Principle:

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

Solution Approach 2:

The invention changes the electrical parameter (surface electrical resistivity) of the packaging material by selecting a plastic film with appropriate electrical properties as the base layer. This parameter change from high resistivity (conventional gas barrier layers) to lower resistivity (plastic film composite) fundamentally alters the electrostatic behavior, preventing powdery substance adhesion.

Inventive Principle:

Principle #35Parameter changes

3Reliability

If a gas barrier layer with high surface electrical resistivity is used, then gas barrier properties are improved, but handling and storage become complicated

Engineering Contradiction:

Improvegas barrier propertiesVSAvoidhandling and storage

Core Design Contradiction:

ReliabilityVSEase of operation

Solution Approach 1:

The packaging material is designed as a composite structure where the plastic film layer provides ease of handling and storage through its flexibility and lower electrical resistivity, while the gas barrier layer provides the required protection. This composite approach allows both performance and operational ease to coexist.

Inventive Principle:

Principle #40Composite materials

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 solution achieves high gas barrier, water vapor barrier, and antistatic performance, preventing static-induced adhesion and ensuring smooth handling of powdery substances.

Implementation Method 1

a layer (Y) containing a polymer (A) having a phosphonic acid unit, and the layer (Y) has a surface electrical resistivity of 1.0 × 10^6 to 1.0 × 10^12 Ω/sq.

Methodology Applied

Scientific EffectChemical bonding: Chemical Bonding

Implementation Method 2

a layer (Z) containing an aluminum atom... achieves high gas barrier... performance

Methodology Applied

Scientific EffectPhysical barrier:

Implementation Method 3

high water vapor barrier performance

Methodology Applied

Scientific EffectHydrophobic effect: Hydrophobe

Data Source

PatentEP3181348B1Antistatic sheet, and packaging material and electronic device including same

Publication Date: 2019.04.03 KURARAY CO LTD

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AI summary

The present invention provides a novel antistatic sheet having high gas barrier performance, high water vapor barrier performance, and antistatic performance, and a packaging material and an electronic device that include the antistatic sheet. The present invention relates to an antistatic sheet including a multilayer structure including a base (X), a layer (Z) containing an aluminum atom, and a layer (Y). The layer (Y) contains a polymer (A) having a vinylphosphonic acid unit, and the layer (Y) has a surface electrical resistivity of 1.0 × 106 Ω/sq or more and 4.0 × 1013 Ω/sq or less.