摘要:
The present invention relates to the production of a polymer powder with improved powder properties, and to its use as impact modifier for rigid polyvinyl chloride (PVC) applications. The impact modifier is composed of emulsion polymer particles which have a core-shell structure, where the shell is composed of a hard polymer and the core is composed of a soft, crosslinked rubber polymer.
摘要:
Process for preparing polymer powder from an aqueous polymer dispersion with water-soluble compounds, the fraction of such compounds being smaller than that of said aqueous polymer dispersion and being based on the polymer present in the form of polymer particles insoluble in water, which comprises subjecting the aqueous polymer dispersion to membrane filtration in a first step of the process and to spray drying in a subsequent second step of the process.
摘要:
An RF security element has a capacitor (8) and a spiral-wound coil (4) with at least two windings (6), in which the coil has at least one winding of straight wire (12) and at least one winding of undulated wire (14). The coil is produced by alternately winding at least one turn of straight wire (12) and at least one turn of undulated wire (14) onto a winding spindle (22), with the undulated wire being formed by passing a portion of straight wire (12) through at least two mating gears (26). The capacitor (8) is produced by intertwining first and second pieces of wire (16, 18) on the two ends of the coil (4).