Abstract: A process manufactures polyisobutene succinic anhydrides from certain polyisobutene mixtures by reacting highly reactive polyisobutene with content of alphadouble bonds of at least 50 mol % and maleic anhydride in a stoichiometric molar ratio of 0.6 mole of maleic anhydride:1 mole of polyisobutene or higher at a temperature of 150 to 260° C. for 15 minutes up to 10 hours.

Abstract: A process manufactures polyisobutene succinic anhydrides from certain polyisobutene mixtures. The process includes reacting highly reactive polyisobutene with a content of alpha-double bonds of at least 50 mol % (determined by 1H NMR spectroscopy) and maleic anhydride in a stoichiometric molar ratio of 0.6 mole of maleic anhydride: 1 mole of polyisobutene or higher at a temperature of 150 to 260° C. for 15 minutes up to 10 hours. The highly reactive polyisobutene has a content of one or more ethers of the formula PIB—O—R1 of 0.8% by weight or more (determined by 1H NMR spectroscopy), in which PIB represents a residue derived from polyisobutene and R1is C1- to C10-alkyl.

Abstract: Mixtures of medium molecular polyisobutene have a number-average molecular weight Mn of more than 10000 g/mol and up to 100000 g/mol. The mixtures have a certain distribution of isomers exhibiting a certain reactivity in thermal and/or photoreactions.

Abstract: Polyisobutene mixtures are made with an increased content of polyisobutene isomers with a beta-double bond.

Abstract: The invention relates to a process for separating off maleic anhydride from a gas stream comprising maleic anhydride, in which a) the gas stream comprising maleic anhydride is brought into contact with a liquid absorbent phase comprising at least one high-boiling inert absorption medium for maleic anhydride and b) maleic anhydride is separated off from the resulting liquid absorbate phase by stripping with a hydrogen-comprising gas as stripping medium in a column, wherein the stripping medium is fed in at two points on the column which are at least one theoretical plate apart.

Abstract: A device for assisting extraction of a material contained in a cartridge for preparation of a beverage has a wall which forms a hollowed enclosure which has an interior surface which defines a frustoconically shaped cavity for containing the cartridge. A rim intersects and extends laterally from the interior surface of the wall to form a peripheral rim base surface which intersects the wall for supporting a cartridge contained by the interior wall surface. A plurality of fins integral with the rim extend from the rim laterally, with respect to the interior wall surface, to converge and connect at an area which is centrally disposed, with respect to the interior wall surface and rim, and displaced at a distance away from a plane defined by the intersection of the interior wall and rim base surfaces so that the area of convergence is displaced away from a cartridge contained and supported by the wall and rim base surfaces.

Abstract: Sealed power cables (e.g. for underground or submarine use) are often equipped with a metal sheath. A problem with some such cables is that their insulation is subject to greater thermal expansion of the cable during use than the metal sheath is capable of following. According to the present invention the metal sheath (5) is longitudinally corrugated either when the metal sheath is manufactured or by pressing a metal sheet which is originally plane over resilient ribs disposed longitudinally on the cable.

Abstract: The shell includes a core wedged rearwardly in a shoe and attached by a glue joint to a destructible plastics skirt fixed to the shoe. The invention is particularly useful for small or medium calibre shells.