Silane-Modified Adhesive Composition for UV-Stable High-Strength Bonding

Resolve Bottlenecks,
Find Innovative SolutionsGenerate Solutions

Solution Overview

Problem

Conventional polyurethane-based adhesives and silane-modified polymer adhesives face issues such as health and safety concerns due to residual isocyanates, poor UV stability, limited bond strength, and require a priming step, while silane-modified polymers lack comparable mechanical properties to polyurethanes.

Innovation Solution

A curable composition comprising silane-modified polymers, cycloaliphatic diisocyanate compounds, secondary aminosilanes, and optional additives like silica, calcium carbonate, adhesion promoters, and catalysts, which form adhesives, sealants, or coating materials with enhanced mechanical properties, UV stability, and ease of use.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If polyurethane-based adhesives are used, then excellent mechanical properties and reliability are achieved, but health and safety concerns arise due to residual isocyanates and UV stability is poor

Engineering Contradiction:

Improvemechanical propertiesVSAvoidresidual isocyanates and UV stability

Core Design Contradiction:

ReliabilityVSObject-affected harmful factors

Solution Approach 1:

The patent uses silane-modified polymers as a composite alternative to conventional polyurethane adhesives. The silane-modified polymer combines the mechanical reliability needed for bonding applications with improved UV stability and eliminated isocyanate residues, creating a material that integrates multiple desirable properties into a single adhesive system

Inventive Principle:

Principle #40Composite materials

Solution Approach 2:

The patent modifies the chemical composition parameters by using silane-modified polymers instead of conventional polyurethanes. This parameter change eliminates isocyanate groups while maintaining mechanical properties through alternative polymer chemistry, and improves UV stability by changing the molecular structure to be more resistant to photodegradation

Inventive Principle:

Principle #35Parameter changes

2Object-affected harmful factors

If silane-modified polymer adhesives are used, then health and safety profile and UV stability are improved, but mechanical bond strength and elongation are insufficient

Engineering Contradiction:

Improveisocyanate residues and UV stabilityVSAvoidbond strength and elongation

Core Design Contradiction:

Object-affected harmful factorsVSStrength

Solution Approach 1:

The patent optimizes the molecular weight parameters of the polyol components within specific ranges (2,000-10,000 g/mol for polyether polyols, 500-2,000 g/mol for polyester polyols) to achieve the right balance between mechanical strength and the inherent UV stability of silane-modified polymers. These parameter adjustments ensure adequate bond strength without compromising the health and safety advantages

Inventive Principle:

Principle #35Parameter changes

3Ease of manufacture

If conventional polyurethane adhesives are used, then cost-effectiveness and ease of use are achieved, but a priming step is required and paintability is limited

Engineering Contradiction:

Improvecost-effectivenessVSAvoidpriming requirement and paintability

Core Design Contradiction:

Ease of manufactureVSEase of operation

Solution Approach 1:

The patent changes the chemical surface properties by using silane-modified polymers with different surface energy characteristics compared to conventional polyurethanes. This parameter change eliminates the need for priming steps on many substrates and improves paintability, while the formulation maintains cost-effectiveness through efficient use of materials and simplified application procedures

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 composition achieves high bond strength, excellent elongation, good health and safety profile, and easy implementation with no priming required, suitable for applications in the rail and automotive industries.

Implementation Method 1

at least one secondary aminosilane with two hydrolysable groups

Methodology Applied

Scientific EffectHydrolysis: Hydrolysis

Data Source

PatentUS20260042878A1Curable Compositions Comprising At Least One Silane-Modified Polymer

Publication Date: 2026.02.12 HENKEL KGAA

AI summary

The invention relates to adhesive, sealant, and/or coating materials comprising a curable composition and the use thereof, the curable composition comprisingI. at least one silane-modified polymer obtainable by reacting(A) at least one polymer terminated with amine groups at both ends, which polymer is selected from polyester, polyether polyols, poly(meth)acrylates, polyolefins, and/or copolymers of the aforementioned and has a molecular weight Mw between 250 and 10,000 Dalton,(B) at least one cycloaliphatic diisocyanate compound, and(C) at least one secondary aminosilane with two hydrolysable groups;II. surface treated silica;III. surface treated calcium carbonate;IV. at least one additional aminosilane;V. optionally, at least one adhesion promoter;VI. optionally, at least one pigment;VII. optionally, at least one catalyst;VIII. optionally, at least one plasticizer.