Abstract: Described is a process for preparing a dispersion of microcapsules by condensing a partially methylated melamine-formaldehyde resin having a molar ratio of melamine:formaldehyde:methanol of from 1:3.0:2.0 to 1:6.0:4.0 in water in which the essentially water-insoluble material forming the capsule core is present in dispersion in the presence of an alkali metal salt of a homopolymer or copolymer of 2-acrylamido-2-methylpropanesulfonic acid as protective colloid at a pH of from 3 to 6.5 by preforming the microcapsules at a temperature of from 20 to 50° C. and then curing the capsule wall of the preformed microcapsules at >50 to 100° C., which comprises adding from 5 to 100% by weight of melamine, based on the melamine-formaldehyde resin, in the course of curing. The microcapsule dispersions are formaldehyde-reduced and of low viscosity.

Abstract: Described is a process for preparing a dispersion of microcapsules by condensing a partially methylated melamine-formaldehyde resin having a molar ratio of melamine:formaldehyde:methanol of from 1:3.0:2.0 to 1:6.0:4.0 in water in which the essentially water-insoluble material forming the capsule core is present in dispersion in the presence of an alkali metal salt of a homopolymer or copolymer of 2-acrylamido-2-methylpropanesulfonic acid as protective colloid at a pH of from 3 to 6.5 by preforming the microcapsules at a temperature of from 20 to 50° C. and then curing the capsule wall of the preformed microcapsules at >50 to 100° C., which comprises adding from 5 to 100% by weight of melamine, based on the melamine-formaldehyde resin, in the course of curing. The microcapsule dispersions are formaldehyde-reduced and of low viscosity.

Abstract: A wiper arm for wiping vehicle's windows and having an essentially oblong wiper arm body. The wiper arm body has essentially, along its whole length, a cross-sectional shape which has a first curvature facing the window and a second curvature facing away from the window. The second curvature being smaller than the first curvature.

Abstract: Subcaliber ammunition, especially for utilization with cannon which are mounted on board aircraft, including a subcaliber projectile core and a propulsion mechanism. The propulsion mechanism is constructed as an inherently stable secondary projectile which flies at a readily estimatable trajectory. The propulsion mechanism continues to fly in the manner of a projectile subsequent to the separation thereof from the projectile core.

Abstract: In a sabot projectile, a projectile core is held fast in a sabot. To the outside of the sabot a hood engaging over the projectile core is secured. To obtain a tight seal of the hood on the sabot by simple measures, particularly without a thread, the shell of the hood is designed with a sealing rim applying against a smooth annular zone of the sabot. Webs of the hood extend beyond the sealing rim. On their free ends, they are provided with inwardly projecting snap noses which engage a recess of the sabot.

Abstract: A pressure-sensitive and heat-sensitive recording material which comprises a carrier bearing a color-developing coating consisting of(a) a finely divided solid phenolic resin with spherical particles of size .ltoreq.5 .mu.m,(b) a copolymer as the dispersant, obtained from (.alpha.) a compound of the formula ##STR1## where R.sup.1 is C.sub.8 -C.sub.20 -alkyl, phenyl or C.sub.1 -C.sub.20 -alkylphenyl, R.sup.2 is hydrogen or methyl, n is from 2 to 100 and m is from 0 to 50, and (.beta.) an ethylenically unsaturated copolymerizable carboxylic acid, sulfonic acid or phosphonic acid, with or without (.gamma.) an additional ethylenically unsaturated copolymerizable compound different from (.alpha.) and (.beta.), and(c) one or more aliphatic alcohols which are solid at room temperature, with or without(d) other auxiliaries.The coating, used in conjunction with micro-encapsulated color formers, gives sharp and intense copies.

Abstract: A microcapsule-containing wax composition, which comprises (a) microcapsules of from 2 to 10 .mu.m diameter, (b) waxes and (c) dispersants, with or without pigments, fillers, volatile constituents and other agents conventionally present in wax compositions for the hot carbon process.The wall material of the microcapsules is a cross-linked urea-melamine condensate.The wax compositions may be applied over all or part of the surface of a base material, and give deeply colored copies with color-forming (CF) layers.