Silane-Functional Curable Composition for Subzero Curing

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Solution Overview

Problem

Existing curable compositions that cure at low temperatures are not safe for handling due to isocyanate-based materials, and there is a need for compositions that cure at temperatures ranging from -1°C to -25°C with fast strength development and transparency.

Innovation Solution

A curable composition comprising silane-functional polymers, plasticizers, fumed silica, and optionally calcium carbonate, which cures through moisture at low temperatures, providing fast strength development and transparency.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Temperature

If isocyanate-based materials are used for low temperature curing, then curing at low temperature is achieved, but safety concerns arise due to human exposure risks

Engineering Contradiction:

Improvecuring temperatureVSAvoidsafety concerns

Core Design Contradiction:

TemperatureVSObject-affected harmful factors

Solution Approach 1:

The patent changes the chemical composition parameters by replacing isocyanate-based polymers with silane-functional polymers containing hydroxyl groups. This parameter change maintains the low temperature curing capability while eliminating the harmful isocyanate exposure risks, thus resolving the contradiction between achieving low temperature curing and ensuring safety.

Inventive Principle:

Principle #35Parameter changes

Solution Approach 2:

The patent uses silane-functional polymers with hydroxyl groups that cure rapidly at low temperatures through moisture reaction, creating a composition that is safe for handling and does not require the hazardous isocyanate materials. This provides a safer alternative that achieves the same functional goal without the harmful side effects.

Inventive Principle:

Principle #27Cheap short-living objects (Disposable)

2Strength

If conventional thermally-cured compositions are used, then strong bonding is achieved, but energy consumption increases and substrate damage may occur

Engineering Contradiction:

Improvebonding strengthVSAvoidenergy consumption

Core Design Contradiction:

StrengthVSUse of energy by moving object

Solution Approach 1:

The patent replaces the thermal curing mechanism with a moisture-based chemical curing mechanism. Instead of using heat energy to activate the curing process, the composition utilizes ambient moisture to trigger the silane-hydroxyl reaction, thereby achieving strong bonding without the energy consumption and substrate damage associated with thermal curing.

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

Solution Approach 2:

The composition uses moisture from the environment as the curing agent, eliminating the need for external energy input. The silane-functional polymer with hydroxyl groups reacts with ambient moisture to self-cure and form strong bonds, providing a self-service curing mechanism that avoids the energy consumption and thermal damage issues of conventional methods.

Inventive Principle:

Principle #25Self-service

3Speed

If fast strength development is required at low temperatures, then immediate use of coated articles is enabled, but composition formulation becomes more complex

Engineering Contradiction:

Improvestrength development speedVSAvoidcomposition complexity

Core Design Contradiction:

SpeedVSDevice complexity

Solution Approach 1:

The patent creates a composite composition by combining silane-functional polymers with hydroxyl groups and specific silane compounds. This composite formulation enables fast strength development at low temperatures through the synergistic reaction between the hydroxyl groups and moisture, while the carefully selected composition components work together to achieve rapid curing without excessive complexity.

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 rapid strength development at low temperatures, allowing immediate use of coated or sealed articles, and is suitable for environments below 0°C without the need for thermal or radiation curing.

Implementation Method 1

a curable composition which cures through moisture at low temperatures

Methodology Applied

Scientific EffectMoisture cure: Hydrolysis

Data Source

PatentEP4644445A1Use of a curable composition at low temperature

Publication Date: 2025.11.05 BOSTIK SA(FR)

AI summary

The present invention relates to the use of a curable composition for sealing, coating or bonding at a curing temperature ranging from -1°C to - 25°C, said curable composition comprising: - from 15% to 65% by weight of one or several silane-functional polymer P comprising at least one functional group having formula (I): -C(O)-N(R6)-R3-Si(R4)p(OR5)3-p (I) - from 5% to 40% by weight of one or several plasticizer; - from 1% to 25% by weight of fumed silica; - optionally calcium carbonate.