Particulate Pressure-Sensitive Adhesive Composition for Resealing Packaging

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Solution Overview

Problem

Hot melts for pressure-sensitive adhesives have high tack strength, making them difficult to apply in extrusion molding and prone to blocking, while methods to reduce tack strength either result in insufficient adhesion or handling issues.

Innovation Solution

A composition in particulate form combining a thermoplastic elastomer and a tackifier, with a specific weight ratio of 1.5 to 3.0, which reduces tack strength and prevents blocking, facilitating easy handling and high adhesion in multilayered films for resealing packaging.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Strength

If hot melt for pressure-sensitive adhesive is used, then high tack strength is achieved, but blocking occurs and handling becomes difficult

Engineering Contradiction:

Improvetack strengthVSAvoidhandling ease

Core Design Contradiction:

StrengthVSEase of operation

Solution Approach 1:

The hot melt adhesive is divided into particles through extrusion molding, creating a particulate composition that reduces surface contact area and prevents blocking while maintaining high tack strength when applied

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The physical state of the adhesive is changed from continuous film to discrete particles, and the composition is optimized with specific components (polymer, tackifier, plasticizer) in controlled ratios to achieve desired tack strength and flow properties

Inventive Principle:

Principle #35Parameter changes

2Ease of manufacture

If antiblocking agent is added to enable particle shape, then extrusion molding becomes possible, but handling remains difficult due to high tack strength

Engineering Contradiction:

Improveextrusion molding capabilityVSAvoidhandling ease

Core Design Contradiction:

Ease of manufactureVSEase of operation

Solution Approach 1:

The adhesive composition is formulated as a composite material containing polymer, tackifier, and plasticizer in specific ratios, creating a particulate structure that enables extrusion molding while the plasticizer component specifically addresses handling difficulties by reducing inter-particle adhesion

Inventive Principle:

Principle #40Composite materials

3Ease of operation

If hot melt with small tack strength is used to prevent blocking, then particle shape is achievable, but sufficient adhesion cannot be provided

Engineering Contradiction:

Improveblocking resistanceVSAvoidadhesion strength

Core Design Contradiction:

Ease of operationVSStrength

Solution Approach 1:

The composition parameters are precisely controlled with polymer at 5-50 parts, tackifier at 45-90 parts, and plasticizer at 5-20 parts, creating a balance where the plasticizer reduces blocking while the tackifier maintains adhesion strength

Inventive Principle:

Principle #35Parameter changes

Data Source

PatentEP3666841B1Composition for pressure-sensitive adhesive, material for pressure-sensitive adhesive, method for forming pressure-sensitive adhesive, pressure-sensitive adhesive, multilayered film and package

Publication Date: 2024.01.03 ASAHI KASEI KOGYO KABUSHIKI KAISHA

AI summary

A composition for a pressure-sensitive adhesive, the composition being to be used for a pressure-sensitive adhesive and including an integrated form of at least one of thermoplastic elastomer A and at least one of tackifier B, wherein a ratio of the total weight of the tackifier to the total weight of the thermoplastic elastomer in the composition is more than 1.5 and 3.0 or less.