Curable Silicone Composition for Adhesion and Storage Stability

Resolve Bottlenecks,
Find Innovative SolutionsGenerate Solutions

Solution Overview

Problem

Existing curable silicone compositions using neutral crosslinkers that release hydroxycarboxylic acid esters or amides during crosslinking suffer from poor adhesion on certain substrates and moderate storage stability, particularly in the presence of curing catalysts and adhesion promoters.

Innovation Solution

A curable composition comprising polyorganosiloxanes endcapped with specific silane groups, combined with a curing catalyst and a polymer containing silane-functional groups, to enhance adhesion and storage stability.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Strength

If neutral crosslinkers releasing hydroxycarboxylic acid esters or amides are used, then adhesion on certain substrates improves, but storage stability deteriorates

Engineering Contradiction:

ImproveadhesionVSAvoidstorage stability

Core Design Contradiction:

StrengthVSStability of the object's composition

Solution Approach 1:

The patent introduces a specific catalyst system (tin catalyst combined with organic acid) as an intermediary that mediates between the crosslinker and substrate. This catalyst system enables the crosslinking reaction to proceed effectively while maintaining storage stability, resolving the contradiction between adhesion improvement and storage stability deterioration.

Inventive Principle:

Principle #24Intermediary (Mediator)

Solution Approach 2:

The patent changes the chemical parameters of the crosslinking system by specifying particular hydroxycarboxylic acid esters or amides with controlled molecular weights and functional groups. By adjusting these chemical parameters, the patent achieves both improved adhesion and maintained storage stability, resolving the technical contradiction.

Inventive Principle:

Principle #35Parameter changes

2Productivity

If crosslinkers releasing aggressive compounds are used, then crosslinking efficiency improves, but harmful effects on metals, stone, or mortar increase

Engineering Contradiction:

Improvecrosslinking efficiencyVSAvoidcorrosive effects

Core Design Contradiction:

ProductivityVSObject-generated harmful factors

Solution Approach 1:

The patent converts the potentially harmful aggressive compounds into beneficial byproducts by selecting crosslinkers that release hydroxycarboxylic acid esters or amides instead of strong acids or bases. These byproducts are less corrosive and can even contribute to the curing process, thus converting a harmful factor into a beneficial one while maintaining crosslinking efficiency.

Inventive Principle:

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

Solution Approach 2:

The patent uses crosslinkers that produce transient, easily decomposed byproducts (hydroxycarboxylic acid esters or amides) rather than persistent aggressive compounds. These short-living byproducts perform their function during crosslinking and then decompose without causing long-term harm to substrates like metals, stone, or mortar.

Inventive Principle:

Principle #27Cheap short-living objects (Disposable)

3Stability of the object's composition

If oximosilane crosslinkers are used, then storage stability improves, but adhesion on certain substrates deteriorates

Engineering Contradiction:

Improvestorage stabilityVSAvoidadhesion

Core Design Contradiction:

Stability of the object's compositionVSStrength

Solution Approach 1:

The patent creates a composite crosslinking system that combines oximosilane crosslinkers with specific hydroxycarboxylic acid esters or amides. This composite approach allows the system to benefit from the storage stability of oximosilanes while the added components improve adhesion on challenging substrates like PMMA, thus resolving the contradiction between storage stability and adhesion.

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 composition achieves improved adhesion on various substrates, including PMMA, and maintains excellent storage stability, overcoming the limitations of previous formulations.

Implementation Method 1

In the presence of atmospheric moisture these alkoxysilane-terminated polymers are able to condense with elimination of the alkoxy groups

Methodology Applied

Scientific EffectHydrolysis: Hydrolysis

Implementation Method 2

these alkoxysilane-terminated polymers are able to condense with elimination of the alkoxy groups

Methodology Applied

Scientific EffectCondensation: Condensation

Implementation Method 3

These compositions contain at least one curing catalyst

Methodology Applied

Scientific EffectCatalysis: Catalysis

Data Source

PatentEP4444800B1Curable silicone compositions containing additives

Publication Date: 2025.12.24 HENKEL KGAA

AI summary

The invention relates to curable compositions based on polyorganosiloxanes with special silicon-containing terminal groups, a curing catalyst, and a polymer having at least one silane-functional group. The invention also relates to adhesive, sealant, and/or coating materials comprising said composition and the use of said composition.