Resist development traditional method

Development. Resist development is a critical step in lithography, because it exerts great influence on pattern quality. The traditional development method uses a liquid developer solution that preferentially dissolves either the exposed region (positive resists) or the unexposed region (negative resists). Development can be carried out by either spray or immersion tech-... 

The more traditional method to make laminates uses separate plies combined with adhesives, which can be divided into groups—molten, water-based and solvent-based. Wax and polythene extrusion are the main molten laminants. Water-based glues are often used to combine paper and foil. Solvent-based adhesives include the polymethanes, but recent developments use water dispersions and molten curing systems to replace the solvent systems. Cross-linking reactions develop high heat and product resistance in all these adhesives. 

Work on metallic additives has been particularly to the fore in Japan. A process to produce very fine metal fibres has been developed at the Nippon Institute of Technology (NIT), Saitama, Japan, and has been commercialized in a joint venture with NV Bekaert, Belgium, under the name Bekinit KK. Described as coil shaving, it is faster and more versatile than traditional methods. Fibres of 20-100 pm in diameter can be produced from titanium, aluminium, nickel, copper, and stainless steel, which offer improved conductivity in plastics compounds. Filter media, heat-resistant fabrics, and motorcycle silencers are among other potential applications. 

Terpolymers crosslinkable by traditional methods were originally developed to overcome some of the problems encountered in the peroxide curing of EPMs. However, compared to sulphur cured products, peroxide crosslinked EPDMs have better high-temperature resistance, lower compression set, improved electrical properties and more stable colours. They are non-staining and it is possible to reduce blooming there is no limitation on the covulcanisation of blends of polymers of different types. 

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