Thermoplastic Elastomer Composition with Acrylic Blocks for Polar Adhesion
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Solution Overview
Problem
Styrene thermoplastic elastomers exhibit insufficient adhesive strength to polar materials and have transparency issues.
Innovation Solution
A thermoplastic elastomer composition comprising 100 parts by mass of a hydrogenated block copolymer, 20 to 180 parts by mass of an acrylic block copolymer, 5 to 45 parts by mass of an aromatic polymer, and 70 to 250 parts by mass of a softener, with specific molecular weight and content ranges for each component, to enhance flexibility, tensile properties, and transparency while improving adhesive strength to polar materials.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If styrene thermoplastic elastomer is used, then formability is improved, but adhesive strength to polar materials deteriorates
Solution Approach 1:
The patent creates a composite material system combining styrene thermoplastic elastomer (for formability) with polar polymer particles (for adhesion). The polar polymer particles are dispersed within the styrene thermoplastic elastomer matrix, allowing the composite to simultaneously exhibit good formability from the styrene component and high adhesive strength from the polar polymer component.
Solution Approach 2:
The patent applies local quality by concentrating polar polymer particles at the bonding interface with polar substrates. This localized placement of polar material enhances adhesive strength where needed (at the interface) while maintaining the overall formability characteristics of the styrene thermoplastic elastomer in the bulk material.
2Strength
If polar soft polymer is added to improve adhesiveness, then adhesive strength to polar materials is improved, but transparency deteriorates
Solution Approach 1:
The patent changes the particle size parameter of the polar polymer to sub-visual dimensions (0.1-10 μm). This parameter change allows the polar polymer to provide adhesive functionality while remaining optically transparent, as particles of this size do not scatter visible light significantly. The patent also controls the concentration of polar polymer particles to maintain transparency while achieving sufficient adhesion.
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 achieves high flexibility, tensile properties, transparency, and strong adhesion to polar materials, enabling the production of formed products and layered structures with improved performance.
Implementation Method 1
a hydrogenated block copolymer (A)... a block copolymer (P) having at least two polymer blocks (a1) with a structural unit derived from an aromatic vinyl compound and at least one polymer block (a2) with a structural unit derived from a conjugated diene
Implementation Method 2
the acrylic block copolymer (B) has at least one polymer block (b1) with a structural unit derived from an acrylate and at least one polymer block (b2) with a structural unit derived from a methacrylate
Data Source
AI summary
A thermoplastic elastomer composition including 100 parts by mass of a hydrogenated block copolymer (A), 20 to 180 parts by mass of an acrylic block copolymer (B), 5 to 45 parts by mass of an aromatic polymer (C), and 70 to 250 parts by mass of a softener (D). The hydrogenated block copolymer (A) is a hydrogenated product of a block copolymer (P) having at least two polymer blocks (a1) with a structural unit derived from an aromatic vinyl compound and at least one polymer block (a2) with a structural unit derived from a conjugated diene. The acrylic block copolymer (B) has at least one polymer block (b1) with a structural unit derived from an acrylate and at least one polymer block (b2) with a structural unit derived from a methacrylate.