Silicone PSA Emulsion Curing with Dispersed Benzoyl Peroxide

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Solution Overview

Problem

Platinum catalyzed silicone pressure sensitive adhesive systems are expensive, while aminosilane catalyzed systems suffer from unstable adhesion or poor cohesion, and benzoyl peroxide is difficult to use in waterborne silicone pressure sensitive adhesives due to its crystalline solid nature.

Innovation Solution

A curable silicone pressure sensitive adhesive emulsion is prepared using a benzoyl peroxide dispersion combined with phenoxy-functional alcohol, bis-hydroxyl-terminated polydiorganosiloxane gum, polyorganosilicate resin, alcohol ethoxylate surfactant, and additional water, forming an oil-in-water emulsion that can be cured to form a pressure sensitive adhesive with good adhesion.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If platinum catalyzed addition reaction is used for curing silicone pressure sensitive adhesive, then adhesion performance is improved, but manufacturing cost increases

Engineering Contradiction:

Improveadhesion performanceVSAvoidmanufacturing cost

Core Design Contradiction:

ReliabilityVSEase of manufacture

Solution Approach 1:

The patent replaces expensive platinum catalyst with a cheaper organic peroxide initiator (benzoyl peroxide or dicumyl peroxide) that initiates free radical curing. This substitution directly addresses the cost issue while maintaining curing functionality, using a disposable, low-cost chemical system instead of an expensive reusable catalyst.

Inventive Principle:

Principle #27Cheap short-living objects (Disposable)

Solution Approach 2:

The patent changes the chemical reaction mechanism from platinum-catalyzed addition reaction to peroxide-initiated free radical reaction. This fundamental parameter change in the curing chemistry enables cost reduction while achieving comparable adhesion performance through a different chemical pathway.

Inventive Principle:

Principle #35Parameter changes

2Ease of manufacture

If aminosilane catalyzed condensation reaction is used for curing silicone pressure sensitive adhesive, then manufacturing cost is reduced, but adhesion stability and cohesion deteriorate

Engineering Contradiction:

Improvemanufacturing costVSAvoidadhesion stability

Core Design Contradiction:

Ease of manufactureVSReliability

Solution Approach 1:

The patent uses inexpensive organic peroxides (benzoyl peroxide, dicumyl peroxide) as initiators instead of aminosilane catalysts. These peroxides are cheap, single-use chemicals that provide reliable curing without the adhesion stability problems associated with aminosilane systems.

Inventive Principle:

Principle #27Cheap short-living objects (Disposable)

Solution Approach 2:

The patent substitutes the aminosilane catalyzed condensation mechanism with a peroxide-initiated free radical mechanism. This replacement of the chemical reaction system eliminates the adhesion instability and cohesion problems while maintaining cost effectiveness.

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

3Reliability

If benzoyl peroxide is used as initiator in waterborne silicone pressure sensitive adhesive, then curing effectiveness is improved, but ease of manufacture deteriorates due to difficulty in dissolving or dispersing the crystalline solid

Engineering Contradiction:

Improvecuring effectivenessVSAvoidease of dispersion

Core Design Contradiction:

ReliabilityVSEase of manufacture

Solution Approach 1:

The patent introduces phenoxy-functional alcohols (1-phenoxy-2-propanol or 2-phenoxyethan-1-ol) as intermediary dispersing agents. These intermediaries facilitate the dispersion of benzoyl peroxide crystalline solids in the waterborne adhesive system, solving the solubility problem while maintaining curing effectiveness.

Inventive Principle:

Principle #24Intermediary (Mediator)

Solution Approach 2:

The patent creates a composite dispersion system combining benzoyl peroxide with phenoxy-functional alcohols and water. This composite approach allows the crystalline peroxide to be effectively dispersed in the waterborne adhesive through the mediating作用 of the phenoxy alcohol, achieving both manufacturability and curing performance.

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 emulsion provides a cost-effective adhesive with stable adhesion and low residue after removal from stainless steel substrates, overcoming the limitations of previous systems.

Implementation Method 1

silicone pressure sensitive adhesive emulsions may cure via platinum catalyzed addition reaction, peroxide initiated free radical reaction

Methodology Applied

Scientific EffectPeroxide initiated free radical reaction: Chemical Bonding

Implementation Method 2

benzoyl peroxide is a crystalline solid, which is difficult to dissolve or disperse in water and therefore difficult to use in waterborne silicone pressure sensitive adhesives

Methodology Applied

Scientific EffectDispersion: Dispersion (of waves)

Implementation Method 3

an alcohol ethoxylate surfactant

Methodology Applied

Scientific EffectSurfactant: Surfactant

Data Source

PatentUS12503631B2Curable silicone pressure sensitive adhesive emulsion and method for its preparation

Publication Date: 2025.12.23 DOW SILICONES CORP

AI summary

A method for preparing a curable silicone pressure sensitive adhesive emulsion includes preparing a dispersion of benzoyl peroxide and a phenoxy-functional alcohol and thereafter combining the dispersion with the other starting materials of the emulsion.