Block Copolymer Acrylic Adhesive Blends for Solvent-Free Tapes
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Solution Overview
Problem
Current adhesive formulations for pressure-sensitive adhesives lack optimal performance and sustainability, particularly in terms of environmental regulations and processing costs, necessitating the development of new compositions that balance performance and cost-effectiveness.
Innovation Solution
A pressure-sensitive adhesive composition comprising 92 to 99.9 parts of a block copolymer adhesive and 0.1 to less than 10 parts of an acrylic adhesive, with specific block copolymer and tackifier combinations to achieve desired properties, including the use of multi-arm and polymodal block copolymers, and the option for hot melt or solvent-based formulations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If solvent-based adhesives are used, then adhesion performance is improved, but environmental sustainability deteriorates and processing costs increase
Solution Approach 1:
The patent changes the chemical composition parameters by formulating a hot melt adhesive using block copolymer and acrylic adhesive components in specific ratios (92-99.9% block copolymer, 0.1-10% acrylic adhesive). This parameter change enables the adhesive to achieve solvent-free operation while maintaining adhesion performance through optimized molecular structure and composition.
Solution Approach 2:
The patent creates a composite adhesive system by combining block copolymer (comprising rubbery and glassy blocks) with acrylic adhesive components. This composite material approach allows the formulation to achieve the adhesion properties previously requiring solvents, while eliminating harmful solvent emissions and reducing environmental impact.
2Object-affected harmful factors
If hot melt adhesive is used, then environmental sustainability is improved, but adhesion performance deteriorates
Solution Approach 1:
The patent develops a composite hot melt adhesive combining block copolymer with acrylic adhesive components. The block copolymer provides structural integrity and temperature resistance, while the acrylic components enhance adhesion to various substrates. This composite formulation achieves adhesion performance comparable to solvent-based adhesives without the environmental drawbacks.
Solution Approach 2:
The patent optimizes the molecular weight, glass transition temperature, and composition ratios of the block copolymer and acrylic components to achieve optimal adhesion performance in a solvent-free hot melt system. By carefully controlling these parameters, the adhesive maintains strong bonding capability while operating without solvents.
3Reliability
If complex adhesive formulations are used, then adhesion performance is improved, but manufacturing complexity increases
Solution Approach 1:
The patent uses a composite formulation consisting of block copolymer (with defined rubbery and glassy blocks) and acrylic adhesive components. This structured composite approach provides consistent adhesion performance while maintaining relatively simple manufacturing processes, avoiding the need for complex multi-component systems or sophisticated processing equipment.
Data Source
AI summary
Pressure sensitive adhesive compositions containing 92 to 99.9 parts of a block copolymer adhesive composition and 0.1 to less than 8 parts of an acrylic adhesive composition are described. Tapes including such adhesives, and methods of making such tapes are also described.