Abstract: The invention relates to a novel process for preparing aqueous polyurethane dispersions from solvent-containing, aqueous polyurethane dispersions or solutions by means of flash evaporation of the organic solvents or organic solvent mixtures, and also to a process for preparing aqueous polyurethane dispersions by converting hydrophilically modified NCO prepolymers or polyurethanes in an optionally aqueous, organic solvent or solvent mixture to an aqueous dispersion or aqueous solution and subsequently removing the organic solvent or solvent mixture.

Abstract: A water-soluble or water-dispersible binder based on polybutadienes which is modified with at least 5% by weight of maleic anhydride and wherein at least 30% of the anhydride groups are present as imide groups from reaction with an amino carboxylic acid.

Abstract: A water-soluble or water-dispersible binder based on polybutadienes which is modified with at least 5% by weight of maleic anhydride and wherein at least 30% of the anhydride groups are present as imide groups from reaction with an amino carboxylic acid.

Abstract: A centrifuge installation comprises at least one centrifuge which is loaded and emptied automatically and has an axis, has a centrifuge drum which is provided with the receiving frame, the receiving frame which is rectangular in a plan view and has four corners spaced at equal distances from the centrifuge axis, a plurality of containers which can be filled with industrial piece goods and are insertable into the centrifuge, the container have walls with passages for centrifuged liquid and an upper edge are formed as boxes in a plan view insertable into the receiving frame, a fixing device provided in the centrifuge and arranged to hold the centrifuge drum after braking in a predetermined position, a cover arranged to close the boxes and provided with a locking device, and a gripping device for the boxes, the gripping device is provided with an actuating device for opening and closing the locking device of the cover, the gripping device is also provided with a cover holder which fixes the cover after opening o

Abstract: In an apparatus for the biaxial, simultaneous stretching of a flat film web from particularly polypropylene, the edges of the film web 1 are engaged by grippers 3, which in the stretching zone 9 are driven by divergent threaded spindles 5, and at least part of the stretching in longitudinal direction is effected, by means of a progressive pitch of the threaded spindles, simultaneously with part of the transverse stretching. Subsequent to the progressive pitch a thread with degressive pitch is provided, preferably at the end of the threaded spindles, effecting shrinkage of the previously stretched film web in longitudinal-direction, while preferably simultaneously the film web is further stretched in transverse direction. The shrinking of the film web takes place over about 5 to 10% of the spindle length at up to 10% of the previously produced longitudinal stretching, to the longitudinal stretching degree desired in the finished film.