The invention relates to a continuous process for the preparation of pivaloyl chloride and of aroyl chloride, in particular of benzoyl chloride, which consists in reacting pivalic acid with a trichloromethylated aromatic compound in the presence of a catalyst at a temperature of between 60 C. The apparatus includes a nanostructure being suitable for emitting electrons and a collector. Thus, users making the heaviest demand on the available resources are allocated fewer resources despite their demand, whereas users that make less demands for the resources are granted more of the resources they request. The blurring power of the blur layer is controlled to substantially preserve the pixel-level resolution of the display screen. The dispensing head includes a plastic flange provided with a sealing skirt and an outer catching skirt provided with a snap-fit rim on its inner surface, wherein the neck has a wall and the shoulder has a wall, both said walls being of substantially the same thickness as the sidewall. The elastomeric blends may be mixed by a Y-mix method to improve ozone resistance.