Curable Composition Mixing Sequence for Fast Cure and Adhesion

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Solution Overview

Problem

Curable compositions containing a titanium compound and an amine compound in combination with an amino group-containing silane compound exhibit reduced curability and prolonged curing times, and decreasing the amount of the silane compound compromises adhesion properties.

Innovation Solution

A method involving the sequential mixing of a reactive silicon group-containing organic polymer with a titanium compound and an amine compound, followed by the addition of an amino group-containing silane compound, using a curing catalyst comprising an amidine structure-containing compound or ammonium hydroxide, and a titanium compound, to enhance curability.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Strength

If a combination of titanium compound, amine compound, and amino group-containing silane compound is used as curing catalyst, then adhesion properties are improved, but curability is reduced and curing time is prolonged

Engineering Contradiction:

ImproveadhesionVSAvoidcurability

Core Design Contradiction:

StrengthVSProductivity

Solution Approach 1:

The amino group-containing silane compound is added to the curable composition before use, rather than being added at the time of mixing all components. This preliminary addition allows the silane compound to be present in the composition without interfering with the curing reaction kinetics, while still providing its adhesion-enhancing effect when the composition is applied and cures.

Inventive Principle:

Principle #10Preliminary action

2Productivity

If the amount of amino group-containing silane compound is decreased to improve curability, then curing time is reduced, but adhesion properties are compromised

Engineering Contradiction:

ImprovecurabilityVSAvoidadhesion

Core Design Contradiction:

ProductivityVSStrength

Solution Approach 1:

Inventive Principle:

Principle #10Preliminary action

3Ease of manufacture

If all components are mixed together at once, then manufacturing process is simple, but curability is reduced

Engineering Contradiction:

Improvemixing processVSAvoidcurability

Core Design Contradiction:

Ease of manufactureVSProductivity

Solution Approach 1:

The curable composition is formulated as a multi-component system where the amino group-containing silane compound is added separately from the other components (reactive silicon group-containing organic polymer, titanium compound, amine compound). This segmentation allows the silane compound to be introduced at the appropriate time to avoid interfering with the curing reaction, while still providing its beneficial adhesion effects.

Inventive Principle:

Principle #1Segmentation

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 method results in a curable composition with improved curability, storage stability, adhesion, and tensile properties without compromising the adhesion benefits of the amino group-containing silane compound, and reduces surface bleeding of components.

Implementation Method 1

A curable composition containing a reactive silicon group-containing organic polymer usually contains a curing catalyst (also referred to as a silanol condensation catalyst) such as an organotin compound

Methodology Applied

Scientific EffectCatalysis: Catalysis

Implementation Method 2

The crosslinking results from siloxane bond formation associated with processes such as a hydrolysis reaction of silyl groups which occurs due to moisture or any other cause

Methodology Applied

Scientific EffectHydrolysis: Hydrolysis

Implementation Method 3

a hydrolysis reaction of silyl groups which occurs due to moisture or any other cause

Methodology Applied

Scientific EffectHydrolysis: Hydrolysis

Implementation Method 4

siloxane bond formation associated with processes such as a hydrolysis reaction of silyl groups

Methodology Applied

Scientific EffectCondensation: Condensation

Implementation Method 5

the resulting blend exhibits enhanced adhesion to various adherends

Methodology Applied

Scientific EffectAdhesion: Adhesive

Data Source

PatentEP4656672A1Method for producing curable composition

Publication Date: 2025.12.03 KANEKA CORP

AI summary

Provided is a method for producing a curable composition containing an organic polymer (A) having a reactive silicon group represented by -SiR13-aXa, a curing catalyst (B), and a silane compound (C) having a hydrolyzable silicon group and an amino group and having a molecular weight of 100 to 1500. The curing catalyst (B) includes an amidine structure-containing compound (b1e) represented by R2N=CR3-NR42 or an ammonium hydroxide compound (b1f), and a titanium compound or condensation product thereof (b2). The titanium compound is represented by Ti(OR9)dY4-d. The method includes mixing the organic polymer (A) and the curing catalyst (B) to obtain an intermediate mixture, and then mixing the intermediate mixture and the silane compound (C).