Acrylic Adhesive Tape Resolving Plasticizer Migration

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Solution Overview

Problem

Existing polyvinyl chloride (PVC) film-based pressure-sensitive adhesive tapes suffer from poor adhesion stability over time, with adhesiveness decreasing due to plasticizer migration, and their performance is affected by temperature, leading to issues like residue left on surfaces in hot weather and poor initial tack in cold weather.

Innovation Solution

A pressure-sensitive adhesive composition comprising an acrylic copolymer and an organometallic chelating agent as a crosslinking agent, without an effective amount of a tackifier, is developed. The acrylic copolymer is formed from a mixture of specific alkyl (meth)acrylates and vinyl carboxylic acid, which prevents plasticizer migration and maintains stable adhesiveness across various temperatures.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If a conventional pressure-sensitive adhesive tape is used, then it provides initial adhesion, but the adhesion stability deteriorates over time due to plasticizer migration

Engineering Contradiction:

Improveadhesion stabilityVSAvoidadhesion duration

Core Design Contradiction:

ReliabilityVSDuration of action of stationary object

Solution Approach 1:

The patent changes the chemical composition parameters of the adhesive layer by introducing a crosslinking agent that forms a crosslinked network structure. This crosslinked structure prevents plasticizer migration while maintaining adhesion, thereby improving adhesion stability over time without sacrificing initial adhesion performance

Inventive Principle:

Principle #35Parameter changes

Solution Approach 2:

The patent creates a composite adhesive system by combining the pressure-sensitive adhesive with a crosslinking agent. This composite structure forms a crosslinked network that integrates the benefits of both the adhesive (for bonding) and the crosslinked structure (for preventing plasticizer migration and enhancing stability)

Inventive Principle:

Principle #40Composite materials

2Reliability

If a pressure-sensitive adhesive tape is used in hot weather, then it provides adhesion, but adhesive residues remain on the adhesion surface

Engineering Contradiction:

Improveadhesion performanceVSAvoidadhesive residue

Core Design Contradiction:

ReliabilityVSObject-generated harmful factors

Solution Approach 1:

The patent modifies the thermal properties of the adhesive by introducing a crosslinked network structure. This crosslinked structure increases the thermal stability and glass transition temperature of the adhesive, preventing it from becoming too soft and leaving residues at elevated temperatures while maintaining adequate adhesion performance

Inventive Principle:

Principle #35Parameter changes

3Reliability

If a pressure-sensitive adhesive tape is used in cold weather, then it provides adhesion, but initial tack is poor

Engineering Contradiction:

Improveadhesion performanceVSAvoidinitial tack

Core Design Contradiction:

ReliabilityVSForce

Solution Approach 1:

The patent optimizes the crosslinking density and adhesive composition to balance low-temperature flexibility with bonding strength. The crosslinked network provides structural integrity while the adhesive composition maintains sufficient chain mobility at low temperatures to achieve adequate initial tack

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 pressure-sensitive adhesive composition achieves good initial tack, stable adhesiveness, and resistance to edge warping in cold weather, while preventing adhesive residue in hot weather, thus enhancing the performance and longevity of PVC film-based pressure-sensitive adhesive tapes.

Implementation Method 1

the crosslinking agent is an organometallic chelating agent

Methodology Applied

Scientific EffectChelation:

Implementation Method 2

a crosslinking agent, wherein the acrylic copolymer is a reaction product of a mixture of the following monomers

Methodology Applied

Scientific EffectCrosslinking:

Data Source

PatentUS12234395B2Pressure-sensitive adhesive composition and pressure-sensitive adhesive tape

Publication Date: 2025.02.25 3M INNOVATIVE PROPERTIES CO

AI summary

The present invention provides a pressure-sensitive adhesive composition, including: an acrylic copolymer and a crosslinking agent. The acrylic copolymer is a reaction product of a mixture of the following monomers: a first alkyl (meth)acrylate, an alkyl group in the first alkyl (meth)acrylate having at least 6 carbon atoms; a second alkyl (meth)acrylate, an alkyl group in the second alkyl (meth)acrylate having 1 to 5 carbon atoms; and a vinyl carboxylic acid, the weight ratio of the vinyl carboxylic acid to the mixture being 4% to 5%. The crosslinking agent is an organometallic chelating agent. The weight ratio of the organometallic chelating agent to the mixture is 0.05% to 0.25%. The pressure-sensitive adhesive composition does not contain an effective amount of a tackifier. The present invention further provides a pressure-sensitive adhesive solution, a pressure-sensitive adhesive tape, and a method for preparing the same. The pressure-sensitive adhesive of the present invention is a removable pressure-sensitive adhesive, and is applicable in hot weather and cold weather, and the adhesiveness of the pressure-sensitive adhesive does not decrease over time.