Abstract: In a low pressure process for polymerizing ethene using a Ziegler mixed catalyst comprising (a) a titanium compound, a vanadium compound or a mixture thereof and (b) an aluminum-organic compound or a mixture thereof, an improvement is provided wherein the process is carried out in multi-stages comprising:polymerizing, in a first polymerization stage, in the liquid phase in a dispersion medium of a C.sub.3 - to C.sub.6 -hydrocarbon, andpolymerizing, in a last polymerization stage, in the gas phase.

Abstract: Films, sheets, molded components and parts of other shaped articles formed from a plastomer or elastomer are bonded together or to a substrate employing as an adhesive an adhesive composition heated to 50.degree.-250.degree. C. and consisting essentially of:A. 5-95% by weight of solid or semi-solid atactic poly-.alpha.-olefin or mixture of poly-.alpha.-olefins having a reduced specific viscosity of 0.05-5.0 dl./g.;B. 95-5% by weight of liquid atactic polyolefin or mixture of polyolefins having a viscosity of 150-1,000,000 cp./20.degree. C.; andC. optionally, up to 50% by weight of filler.

Abstract: For preparing crystalline, thermoplastic, low-pressure terpolymers of ethene with 0.1-5 mol % butene-1 and 0.1-3 mol % butene-2 having a density of 0.94-0.96 g./cm.sup.3, a liquid phase monomer mixture consisting essentially of ethene, 0.05-10 mol % butene-1 and 20-98.9 mol % butene-2 is polymerized with a mixed polymerization catalyst comprising (a) TiCl.sub.3 . nAlCl.sub.3 wherein n is 0.2-0.6, and (b) isoprenylaluminum in a molar ratio Al : Ti of about 2-20 to form said terpolymer.

Abstract: Polypropylene can be polymerized with Ziegler-Natta TiCl.sub.3 or TiCl.sub.3 . (AlCl.sub.3).sub.0.2.sub.-0.6 plus chlorine containing organoaluminum compound mixed catalyst using butene-2 or a C.sub.4 -cut comprising butene-2 as the polymerization solvent without the formation of propylene-butene copolymers.

Abstract: High molecular weight, low density copolymers of ethylene and propylene and/or butene-1 are prepared by a low pressure liquid phase polymerization process using a titanium halide - organoaluminum catalyst in a polymerization solvent containing butene-2. Consistently comparable ethylene copolymers can be obtained from monomer mixtures of varying composition.

Abstract: In a low pressure process for the production of crystalline propene-ethene-butene-1 terpolymers with 0.2 to 10% by weight of ethene and 0.2 to 5% by weight of butene-1 with the aid of mixed catalysts of TiCl.sub.3 or TiCl.sub.3 .sup.. n AlCl.sub.3 (n = 0.2 to 0.6), and chlorine-containing organoaluminum compounds, the improvement comprising conducting the polymerization in butene-2 or in a C.sub.4 -cut containing 20-99% butene-2, containing 0.1 - 2.5% of butene-1, with the addition of 0.2 to 10% of ethene, based on the amount of propene employed.