Abstract:
PROBLEM TO BE SOLVED: To make it possible to simply obtain the subject compound useful as a precursor for a polymerization catalyst without using a toxic reactant, by reacting a specific aromatic compound with a specified substituted allyl compound and then dehydrogenating the resultant compound. SOLUTION: (A) A compound represented by formula I [A is a bridge, together with the adjacent carbon, forms an aliphatic aromatic ring which may be condensed with a 6-membered (hetero)aromatic ring or other aromatic rings] is reacted with (B) a compound represented by formula II [R is a 1-10C alkyl or a (1-4C alkyl-substituted)phenyl; X is Cl, Br or I] in the presence of (C) a Friedel-Crafts catalyst such as AlCl3 to provide a compound represented by formula III, which is then dehydrogenated to afford a compound represented by formula IV. Furthermore, the reaction is carried out by using the component C in an amount so as to provide (0.1:1) to (1.5:1), advantageously (0.2:1) to (1.0:1) molar ratio of the components C:B.
Abstract:
Die Copolymere umfassen Ethylengrundbausteine und Vinylformiatgrundbausteine, wobei vorzugsweise der Gehalt an freiem Vinylformiat im Polymer maximal 5.000 ppm, bezogen auf das Gewicht des Copolymers, beträgt. Ferner betrifft die Erfindung ein Verfahren zu ihrer Herstellung sowie ihre Verwendung als Fließverbesserer, insbesondere in Erdöldestillaten, vorzugsweise Brenn- und Treibstoffzusammensetzungen, insbesondere Erdöl-Mitteldestillaten, wie auch eine Brenn- und Treibstoffzusammensetzung, umfassend eine Hauptmenge eines Brenn- und Treibstoffs und eine zur Verbesserung der Fließeigenschaften wirksame Menge des Copolymers.
Abstract:
The invention provides aqueous solutions or dispersions of copolymers obtained by copolymerising (a) 20 to 95 mol.% of at least one monoethylenically unsaturated C4-C12 dicarboxylic acid or its anhydride; (b) 5 to 80 mol.% of at least one branched chain oligomer or polymer with a vinyl, vinylidene or alkylvinylene end group made up of at least 9 C atoms; and (c) 0 to 50 mol.% of at least another monoethylenically unsaturated compound capable of being polymerised with monomers (a) and (b). These aqueous solutions or dispersions contain 0.5 to 70 % by weight of these copolymers in relation to their total weight. They are useful as leather auxiliary and pigment dispersing agents.
Abstract:
PCT No. PCT/EP94/01113 Sec. 371 Date Oct. 23, 1995 Sec. 102(e) Date Oct. 23, 1995 PCT Filed Apr. 11, 1994 PCT Pub. No. WO94/24231 PCT Pub. Date Oct. 27, 1994Fuel and lubricant compositions contain a poly-1-n-alkenylamine as an additive.
Abstract:
Process for the preparation of a supported catalyst for the polymerisation of alpha -olefins, in which (1) a support gel containing silicon dioxide is prepared by (1.1) introducing a sodium or potassium waterglass solution into a rotating stream of an aqueous mineral acid both longitudinally and tangentially to the stream, spraying the silicic acid hydrosol thus formed in droplet form into a gaseous medium, allowing it to solidify into a hydrogel and freeing the hydrogel thus obtained of salt by washing without prior aging, (1.2) drying the hydrogel resulting from (1.1) to form the support gel, and (2) the support gel (1) is loaded with chromium trioxide or a chromium compound which can be converted into chromium trioxide under the conditions of the process step (3), which results in a chromium-containing support gel, and (3) the chromium-containing support gel (2) is heated in an anhydrous gas stream containing oxygen in a concentration of over 10% by volume for from 10 to 1000 minutes at from 400 to 1100 DEG C, the hydrogel resulting from the process step (1.1) being dried in the process step (1.2) over a time of not more than 60 seconds in a shaping flash dryer at an inlet temperature of from 80 to 400 DEG C .
Abstract:
A Phillips catalyst for the polymerization of alpha -olefins, containing, as a catalytically active component, at least one chromium(III) compound on a silicon aluminum phosphate carrier of the general formula (I) (SixAlyPz)O2(I) where x is from 0.05 to 0.5 and y and z are each from 0.1 to 1.0, exhibits in particular high productivity and is preferably used for the preparation of homo- and copolymers of ethylene.
Abstract:
Unsaturated compounds in hydrocarbon streams are hydrogenated over a catalyst which, in the unused state, shows reflections which correspond to the following lattice plane spacings in the X-ray diffraction pattern [in 10-10m]: 4.52, 2.85, 2.73, 2.44, 2.31, 2.26, 2.02, 1.91, 1.80, 1.54, 1.51, 1.49, 1.45 and 1.39 and have specific relative intensities.