Diamide–Polyamide Rheology Control for High-Temperature Storage

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Solution Overview

Problem

The existing rheology control agents in curable compositions, such as sealants and adhesives, face challenges in activating 100% of the agent during kneading, leading to viscosity increases and filler dispersion changes during storage, especially in high temperatures, resulting in storage stability issues.

Innovation Solution

A rheology control agent composed of a diamide compound and/or hydrogenated castor oil mixed with a specific polyamide compound, obtained by condensation or polycondensation of specific amine and carboxylic acid components, is used to stabilize the composition without lowering initial viscosity.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Stability of the object's composition

If a fine powder rheology control agent (hydrogenated castor oil or fatty acid diamide) is used, then the initial viscosity of the curable composition can be controlled, but the agent partially activates during storage causing viscosity increase and storage stability deterioration

Engineering Contradiction:

Improvestorage stabilityVSAvoidviscosity control reliability

Core Design Contradiction:

Stability of the object's compositionVSReliability

Solution Approach 1:

The patent applies preliminary action by pre-mixing the fine powder rheology control agent with a specific polyamide compound before adding it to the curable composition. This pre-combination ensures that the rheology control agent is already associated with a stabilizing agent that prevents premature activation during storage, while still allowing proper activation during the curing process. The polyamide compound acts as a protective carrier that controls the timing of rheology modification.

Inventive Principle:

Principle #10Preliminary action

Solution Approach 2:

The polyamide compound serves as an intermediary between the rheology control agent and the curable composition matrix. It mediates the interaction by providing a controlled release mechanism that prevents direct premature activation of the rheology control agent during storage, while enabling proper activation during curing. This intermediary layer solves the contradiction between maintaining low storage viscosity and ensuring reliable viscosity control.

Inventive Principle:

Principle #24Intermediary (Mediator)

2Stability of the object's composition

If the curable composition is stored in a high temperature environment, then the activation of rheology control agent accelerates causing great viscosity increase, but lowering the initial viscosity to compensate worsens the storage stability

Engineering Contradiction:

Improvestorage stabilityVSAvoidinitial viscosity

Core Design Contradiction:

Stability of the object's compositionVSQuantity of substance

Solution Approach 1:

The patent changes the chemical parameters of the rheology control system by introducing a polyamide compound with specific molecular weight and structure. This parameter change creates a new system where the rheology control agent's activation is thermally stabilized. The polyamide compound's specific parameters (molecular weight 2000-5000, amine-to-acid ratio 0.8-1.2) control the thermal behavior, preventing premature activation at high storage temperatures while maintaining the desired initial viscosity.

Inventive Principle:

Principle #35Parameter changes

Solution Approach 2:

The invention creates a composite rheology control system combining the fine powder rheology control agent with a specifically formulated polyamide compound. This composite material exhibits synergistic effects where the polyamide compound stabilizes the rheology control agent against thermal activation during storage, while both components work together to provide proper viscosity control during curing. The composite approach solves the contradiction between initial viscosity and storage stability under high temperature conditions.

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

This combination reduces storage stability deterioration and filler dispersion changes, maintaining consistent viscosity and stability even in high-temperature environments.

Implementation Method 1

a diamide compound (A) and/or a hydrogenated castor oil (A′), the diamide compound (A) being obtained by condensation reaction between a diamine component (A1) and a monocarboxylic acid component (A2)

Methodology Applied

Scientific EffectCondensation reaction:

Implementation Method 2

a polyamide compound (B) obtained by polycondensation of an amine component (B1) and a carboxylic acid component (B2)

Methodology Applied

Scientific EffectPolycondensation:

Data Source

PatentUS12441884B2Rheology control agent and curable composition using the same

Publication Date: 2025.10.14 KUSUMOTO CHEM

AI summary

A rheology control agent for a curable composition includes: a diamide compound (A) and/or a hydrogenated castor oil (A′), the diamide compound (A) being obtained by condensation reaction between a diamine component (A1) and a monocarboxylic acid component (A2); and a polyamide compound (B) obtained by polycondensation of an amine component (B1) and a carboxylic acid component (B2). The amine component (B1) contains at least one amine selected from the group consisting of a diamine and a triamine having 2 to 54 carbon atoms. The carboxylic acid component (B2) contains at least one carboxylic acid selected from the group consisting of a dicarboxylic acid and a tricarboxylic acid having 4 to 54 carbon atoms. The polyamide compound (B) is obtained by polycondensation of at least one of the amine component (B1) and the carboxylic acid component (B2) containing polymerized fatty acids.