Reactive Silyl Polymer Composition Balancing Strength and Elongation

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Solution Overview

Problem

Cured products formed from a blend of polyoxyalkylene and (meth)acrylic ester polymers with reactive silyl groups exhibit high strength but unsatisfactory elongation.

Innovation Solution

A curable composition comprising polyoxyalkylene and (meth)acrylic ester polymers with specific ratios and distributions of reactive silyl groups on the polymer backbone, optimizing the average number of reactive silyl groups at the ends and inside the backbone, achieves a balance of high strength and elongation.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Strength

If a curable composition is formed from a blend of polyoxyalkylene polymer and (meth)acrylic ester polymer with reactive silyl groups, then high strength is achieved, but elongation becomes unsatisfactory

Engineering Contradiction:

ImprovestrengthVSAvoidelongation

Core Design Contradiction:

StrengthVSEase of operation

Solution Approach 1:

The invention changes the parameters of reactive silyl group distribution by controlling the average ratio of reactive silyl groups to polymer backbone ends (0.5-2.0) and the average number of reactive silyl groups per polymer molecule (0.1-1.0). This parameter optimization resolves the contradiction by achieving both high strength and high elongation in the cured product

Inventive Principle:

Principle #35Parameter changes

Solution Approach 2:

The invention uses a composite system blending polyoxyalkylene polymer (A) and (meth)acrylic ester polymer (B) with specifically controlled reactive silyl group distributions. The synergistic interaction between the two polymers with optimized silyl group parameters creates a cured product that simultaneously achieves high strength and high elongation

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 results in a cured product with both high strength and high elongation, enhancing its mechanical properties.

Implementation Method 1

An organic polymer having a silicon-containing group that has a hydroxy or hydrolyzable group attached to a silicon atom and that is capable of forming a siloxane bond

Methodology Applied

Scientific EffectHydrolysis: Hydrolysis

Implementation Method 2

capable of forming a siloxane bond (the silicon-containing group will be referred to as a 'reactive silyl group' hereinafter)

Methodology Applied

Scientific EffectCondensation: Condensation

Data Source

PatentEP3950832B1Curable composition and cured product

Publication Date: 2025.10.22 KANEKA CORP

AI summary

Provided is a curable composition containing a polyoxyalkylene polymer (A) having a reactive silyl group and a (meth)acrylic ester polymer (B) having a reactive silyl group. In the polymer (A), the average ratio per molecule of the number of the reactive silyl groups to the number of ends of a polymer backbone is 0.80 or more. In the polymer (B), the average number per molecule of the reactive silyl groups bonded at ends of a polymer backbone is from 0.30 to 1.00, and the average number per molecule of the reactive silyl groups bonded inside the polymer backbone is from 0 to less than 0.30.