Photocurable Composition Stabilizing Viscosity with Polyisobutylene
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Solution Overview
Problem
It is challenging to stabilize the viscosity and thixo ratio in photocurable compositions containing (meth)acrylate compounds with a polyisobutylene skeleton due to the low polarity of polyisobutylene, which limits compatibility with other components and results in unstable viscosity and thixo properties.
Innovation Solution
Incorporating a (meth)acrylamide compound in specific proportions with a (meth)acrylate compound having a polyisobutylene skeleton, along with other components such as (meth)acrylate monomers and amorphous silica, to stabilize the viscosity and thixo ratio, ensuring compatibility and maintaining optimal properties during accelerated testing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a (meth)acrylate compound having a polyisobutylene skeleton is used in the composition, then the composition can achieve good curability and adhesion, but the viscosity and thixo ratio become unstable due to low polarity and limited compatibility
Solution Approach 1:
A polyol compound is introduced as an intermediary substance that mediates between the polyisobutylene-based (meth)acrylate compound and other composition components. The polyol compound with hydroxyl groups improves compatibility and interaction between components, stabilizing viscosity and thixo ratio while preserving the curability and adhesion benefits of the polyisobutylene skeleton
Solution Approach 2:
The invention creates a composite composition system that combines the polyisobutylene-based (meth)acrylate compound with polyol compounds and other carefully selected components. This composite approach leverages the complementary properties of each component to achieve both good curability/adhesion and stable rheological properties throughout storage
2Device complexity
If the composition contains components with limited compatibility due to low polarity of polyisobutylene, then the composition can maintain simplicity in formulation, but the viscosity and thixo ratio change significantly during storage
Solution Approach 1:
The polyol compound serves as a compatibility-enhancing intermediary that enables broader component selection without significantly complicating the formulation. It facilitates stable interactions between components, preventing viscosity and thixo ratio changes during storage while maintaining formulation practicality
3Reliability
If the composition is left to stand under accelerated test conditions, then the long-term stability can be evaluated, but the viscosity and thixo ratio change significantly
Solution Approach 1:
The polyol compound is incorporated beforehand to cushion against potential instability issues that would arise during storage and accelerated testing. It pre-establishes stable interactions between components, preventing significant viscosity and thixo ratio changes even under prolonged accelerated test conditions, thereby enabling reliable long-term stability evaluation
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 proposed composition effectively stabilizes the viscosity and thixo ratio, maintaining values of 4.0 or more even after accelerated testing, enhancing the composition's handleability and curability while preventing separation during storage.
Implementation Method 1
due to a low polarity of polyisobutylene, other components compatible with the polyisobutylene are limited, and a viscosity as the composition and a thixo ratio representing a thixo property are not stable due to an influence of the compatibility
Implementation Method 2
a photocurable composition containing a component (A) and a component (B)... component (A): a (meth)acrylate compound having a polyisobutylene skeleton... component (B): a (meth)acrylamide compound
Data Source
AI summary
Although it has been difficult to stabilize a viscosity and a thixo ratio in a composition containing a (meth)acrylate compound having a polyisobutylene skeleton, the present invention can stabilize the viscosity and the thixo ratio in a photocurable composition containing a (meth)acrylate compound having a polyisobutylene skeleton.A photocurable composition including a component (A) and a component (B) such that the component (B) is contained in an amount of 0.1 to 15 parts by mass relative to 100 parts by mass of the component (A):component (A): a (meth)acrylate compound having a polyisobutylene skeleton; andcomponent (B): a (meth)acrylamide compound.