Modified Liquid Diene Rubber for Resin Compatibility
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Solution Overview
Problem
Current curable resin compositions containing methacrylate or acrylate do not meet requirements for high compatibility with polar monomers, satisfactory curing rates, mechanical properties, and adhesion to various materials, particularly in the electric/electronic and optical fields where flexibility, strength, and transparency are crucial.
Innovation Solution
A modified liquid diene-based rubber with a (meth)acryloyl group and specific functional group equivalent weights, combined with a radical polymerization initiator and radical-polymerizable monomers, is used to create a curable resin composition that exhibits high compatibility, low viscosity, and excellent workability, resulting in a cured product with enhanced mechanical properties and adhesion.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Shape
If a low-molecular weight diene-based polymer with methacryloyl or acryloyl group is used in curable resin composition, then flexibility and transparency are improved, but compatibility with polar monomers and adhesion to various materials deteriorates
Solution Approach 1:
The patent uses a composite material approach by combining a diene-based polymer with specific functional groups (carboxyl, hydroxyl, or amine groups) with polar monomers. This composite composition achieves both flexibility from the diene polymer and compatibility/adhesion from the polar functional groups, resolving the contradiction between flexibility and compatibility.
Solution Approach 2:
The patent changes the chemical parameter of the diene-based polymer by introducing specific functional groups (carboxyl, hydroxyl, or amine groups) with controlled equivalent weights. This parameter modification enables the polymer to maintain flexibility while gaining compatibility with polar monomers and improved adhesion properties.
2Illumination intensity
If a low-molecular weight diene-based polymer with methacryloyl or acryloyl group is used in curable resin composition, then transparency is improved, but mechanical strength and adhesion deteriorate
Solution Approach 1:
The patent creates a composite resin composition combining the transparent diene-based polymer with polar monomers containing functional groups. The composite structure maintains the transparency of the base polymer while the polar functional groups contribute to enhanced mechanical strength and adhesion.
Solution Approach 2:
The patent modifies the molecular parameters of the diene-based polymer by introducing functional groups with specific equivalent weights (carboxyl: 70-700, hydroxyl: 50-500, amine: 60-600). This parameter control allows the polymer to maintain transparency while achieving sufficient mechanical strength through improved intermolecular interactions.
3Ease of operation
If the diene-based polymer has high compatibility with polar monomers, then workability is improved, but curing rate may deteriorate
Solution Approach 1:
The patent optimizes the equivalent weight parameters of the functional groups to achieve a balance between compatibility and curing rate. By controlling the concentration and type of polar functional groups, the patent ensures good workability during mixing while maintaining adequate reactivity for satisfactory curing rate.
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 modified liquid diene-based rubber composition achieves a satisfactory curing rate, excellent mechanical properties, and improved adhesion to various materials, making it suitable for applications in the electric/electronic and optical fields, such as adhesives, coatings, and sealing materials.
Implementation Method 1
A modified liquid diene-based rubber with a (meth)acryloyl group and specific functional group equivalent weights, combined with a radical polymerization initiator and radical-polymerizable monomers, is used to create a curable resin composition
Data Source
AI summary
Provided is a modified liquid diene-based rubber having an acryloyl group or a methacryloyl group, which is highly compatible with various monomers, such as acrylate or methacrylate having relatively high polarity, which can form a curable resin composition containing the modified liquid diene-based rubber with good workability, which has a satisfactory curing rate during curing, and which is capable of providing the curable resin composition that forms a cured product having excellent mechanical properties derived from the modified liquid diene-based rubber and having excellent adhesion to various materials. Also provided is a curable resin composition containing the modified liquid diene-based rubber. The modified liquid diene-based rubber is a modified liquid diene-based rubber (A) having, in a molecule, a modified group (a) containing a (meth) acryloyl group as a part thereof and at least one modified group (b) selected from a dicarboxylic acid monoester and a dicarboxylic acid monoamide (with the proviso that the modified group (b) contains no (meth)acryloyl group as a part thereof), wherein the functional group equivalent weights of the modified group (a) and the modified group (b) are each in the range of 700 to 40,000 g/eq.