Moisture-Curable Silylated Polymer Adhesives with Reactive Modifiers

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Solution Overview

Problem

Hydrolysable silane-terminated polymers used in adhesives and coatings typically have lower modulus and tensile strength compared to conventional urethane-based products, and they often require volatile organic solvents to achieve desirable viscosity, which is environmentally undesirable and not compliant with stringent regulations.

Innovation Solution

A moisture-curable resin composition comprising a hydrolysable silyl group-containing polymer, a reactive modifier of the form G2[—SiR4c(OR5)3-c], and a catalyst, which reacts under moisture curing conditions to produce a cured elastomer with high modulus and tensile strength without the need for volatile organic solvents, using dialkoxysilanes as reactive diluents to reduce viscosity and prevent bleeding.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Object-generated harmful factors

If hydrolysable silane-terminated polymers are used in adhesives and sealants, then environmentally friendly low volatile organic content is achieved, but the cured products have lower modulus and tensile strength compared to conventional urethane-based products

Engineering Contradiction:

Improvevolatile organic contentVSAvoidmodulus and tensile strength

Core Design Contradiction:

Object-generated harmful factorsVSStrength

Solution Approach 1:

The patent combines hydrolysable silane-terminated polymers with reactive modifiers containing isocyanate groups to create a composite adhesive system. The silane-terminated polymer provides low volatile organic content and environmental friendliness, while the isocyanate-modified component contributes to enhanced mechanical properties including modulus and tensile strength through additional crosslinking reactions.

Inventive Principle:

Principle #40Composite materials

Solution Approach 2:

The patent modifies the chemical structure and reactivity parameters of the silane-terminated polymer by introducing reactive modifiers with isocyanate groups. This changes the curing mechanism and network structure, transforming the material from having merely low volatile organic content to possessing both low VOC and improved mechanical strength properties.

Inventive Principle:

Principle #35Parameter changes

2Strength

If conventional urethane-based adhesives are used, then high modulus and tensile strength are achieved, but they require volatile organic solvents to achieve desirable viscosity

Engineering Contradiction:

Improvemodulus and tensile strengthVSAvoidvolatile organic solvents

Core Design Contradiction:

StrengthVSObject-generated harmful factors

Solution Approach 1:

The patent extracts and eliminates the volatile organic solvent component from the adhesive formulation by using a reactive modifier system that achieves desirable viscosity through chemical reaction mechanisms rather than physical solvents. The isocyanate-modified silane system provides both viscosity control and strength enhancement without requiring harmful volatile organic solvents.

Inventive Principle:

Principle #2Taking out (Extraction)

3Strength

If reactive modifiers are added to silylated polymers to improve strength, then modulus and tensile strength increase, but viscosity control becomes challenging

Engineering Contradiction:

Improvemodulus and tensile strengthVSAvoidviscosity control

Core Design Contradiction:

StrengthVSDevice complexity

Solution Approach 1:

The patent controls viscosity by carefully selecting and balancing the molecular weight, functionality, and reactivity parameters of the isocyanate-modified component. By adjusting these chemical parameters, the formulation achieves optimal viscosity for application while ensuring sufficient reactivity to develop high modulus and tensile strength upon curing.

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 solution provides a cured product with high modulus and tensile strength, maintaining stability at elevated temperatures and allowing for elongation above 200% while reducing viscosity and eliminating plasticizer migration, thus addressing the limitations of existing hydrolysable silane-terminated polymers.

Implementation Method 1

Hydrolysable silane-terminated polymers are commonly used in the marketplace of adhesives, sealants and coatings

Methodology Applied

Scientific EffectHydrolysis: Hydrolysis

Implementation Method 2

a catalyst for catalyzing the reaction between the moisture-curable polymer (a) and reactive modifier (b) under moisture curing conditions

Methodology Applied

Scientific EffectCatalysis: Catalysis

Data Source

PatentUS9932437B2Moisture curable silylated polymer compositions containing reactive modifiers

Publication Date: 2018.04.03 MOMENTIVE PERFORMANCE MATERIALS INC

AI summary

Moisture-curable resin compositions comprising (a) a moisture-curable polymer having at least one hydrolysable silyl group; (b) a reactive modifier; (c) a catalyst for catalyzing the reaction between the moisture-curable polymer (a) and reactive modifier (b) under curing conditions; and cured compositions produced by contacting such resin compositions with water are disclosed. The moisture-curable resin composition is useful in the production of adhesives, including hot melt adhesives, primers, sealants, and coatings.