Styrene-Free Block Copolymer Additive for Structural Adhesives
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Solution Overview
Problem
Current structural adhesives face limitations in elongation at break, thixotropy, and impact resistance, particularly when exposed to temperature variations, and often require the use of rheological additives that can compromise adhesion.
Innovation Solution
Incorporating styrene-free block copolymers with at least two blocks and core-shell particles made of elastomeric materials, which enhance elongation at break, thixotropy, and impact resistance, while reducing the need for rheological additives.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If rheological additives (fumed silica, polymer waxes, bentonite clays) are used to increase thixotropy, then thixotropic index is improved, but adhesion is compromised
Solution Approach 1:
The patent changes the chemical composition parameters by using styrene-free block copolymers with specific glass transition temperatures and core-shell particles with controlled elastomeric material properties, achieving thixotropy without adhesion-compromising additives
Solution Approach 2:
The patent creates a composite additive system combining styrene-free block copolymers and core-shell particles with elastomeric materials, where the synergistic interaction between components provides thixotropic enhancement while preserving adhesion properties
2Strength
If styrene-containing polymers are used to improve structural adhesive properties, then strength is improved, but elongation at break is limited
Solution Approach 1:
The patent changes the polymer composition by eliminating styrene and using block copolymers with controlled glass transition temperatures, achieving both strength and enhanced elongation at break through optimized polymer architecture
Solution Approach 2:
The patent combines styrene-free block copolymers with core-shell particles containing elastomeric materials to create a composite system that achieves both structural strength and improved elongation at break
3Force
If impact resistance is increased through additive formulations, then impact resistance is improved, but adhesion is compromised
Solution Approach 1:
The patent changes the formulation by using core-shell particles with elastomeric materials having specific glass transition temperatures, achieving impact resistance enhancement without compromising adhesion
Solution Approach 2:
The patent creates a composite system where core-shell particles with elastomeric cores provide impact resistance while the overall composition maintains adhesion properties
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 combination of block copolymers and core-shell particles significantly increases elongation at break, thixotropy index, and impact resistance, allowing for improved adhesive performance without compromising adhesion, even under temperature extremes.
Implementation Method 1
The Applicant observed that the addition of core-shell solid particles, as described above, further increased the elongation at break
Implementation Method 2
the addition of solid particles such as those mentioned above could also increase the thixotropic index of the composition
Implementation Method 3
the addition of particles such as those mentioned above could increase the cold impact and/or the hot impact
Data Source
AI summary
The present invention relates to an additive composition which can be used in particular in a structural adhesive. According to the invention, the composition is characterised in that it comprises: at least one styrene-free block copolymer made up of at least two blocks and in particular at least three blocks; and a plurality of core-shell particles comprising a first elastomer polymer.