Advancements of Hot Melt Pressure Sensitive Adhesive II
The performance features of acrylic tapes that made of hot melt pressure sensitive adhesives, especially strong adhesion and low outgassing, make them ideal for various consumer electronics applications. The tapes can be produced in extremely thin dimensions to accommodate the space constraints of modern digital devices.
Hard disk drives are a notable example. The high-performance acrylic tapes meet the application’s requirements for chemical cleanliness and can be accurately shaped to fit different drive configurations. The tapes help protect the disk drives from heat and vibration during use.
Other consumer electronics applications include light blocking tapes for computer and device screens, optically clear tapes that limit distortion, and lens protection tapes to prevent damage from dirt and scratches. Also, thermally conductive acrylic tapes have been developed to transfer heat from LED lights and other heat sources to reduce operating temperatures.
High-performance acrylic tapes also exhibit excellent high temperature characteristics and robust resistance to harsh substances and materials - properties that equip them for many automotive applications. The tapes perform reliably at continuous temperatures up to 400°F and intermittent temperatures up to 450°F. They also function well under load, such as when applied around corners.
Low surface energy materials such as polypropylene, polyethylene and other engineered plastics have proliferated in automotive applications, but they pose problems for conventional adhesives. High-performance acrylic tapes offer a better solution. They bond securely to low surface energy materials and can even be used to bond two low surface energy materials together.
In addition, these high-performance tapes absorb plasticizers without losing their special properties. Plasticizers found in many engineered films and foams cause rubber-based and other standard adhesives to break down and soften.
Automotive manufacturers are specifying advanced acrylic tapes in passenger compartment, exterior and underhood applications. They are being used, for example, for vehicle attachments, replacing mechanical fasteners and eliminating holes that can allow moisture or liquids to enter and be a starting point for rust. The tapes are used in tandem with damping materials or can be engineered to damp noise and vibrations produced by vehicle systems. The result is a quieter driving experience.
In brake shim applications, high-performance acrylic tapes bond together two stiff materials, the metal shim and brake pad. Here, the adhesives can be stacked in such a way to dissipate vibrations at certain temperatures and prevent noises emanating from the brake assembly.
Acrylic tapes that produce little or no volatile organic compounds find use in applications that require anti-fogging properties. They are earmarked for interior applications to improve air quality and prevent fogging on the windshield from the gradual release of volatile organic compounds.
Appliance applications also call for bonding solutions that can withstand high temperatures and resist damage from harsh substances. High-performance acrylic tapes are finding increased use, for example, in dishwashers, washing machines, and dryers. They can securely attach sound damping foams and stiffeners in these appliances, reducing noise and vibration during use. They can replace mechanical fasteners in areas such as control panels, eliminating the need to drill holes in parts, speeding assembly.
Additional appliance applications include ovens, cook tops and microwaves. Here, high-performance acrylic tapes are able to maintain adhesive strength despite exposure to vegetable oils, food acids and other harsh substances.
All in all, advancements in Hot Melt Pressure Sensitive Adhesive make it possible for easier assembly and higher bonding performance.
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