Basf Aktiengesellschaft

Basf Aktiengsellschaft

Rudolf Mueller-Mall

Guenther Schweier

Rainer Konrad

Guido Funk

Juergen Kerth

Rainer Hemmerich

Michael Melan

Franz Merger

Gerhard Nestler

Eckehardt Wistuba

Juergen Schmidt-Thuemmes

Kurt Wendel

Wolfgang Schwarz

Wolfgang Gruber

Eckard Schauss

Robert Bachl

Erich Kolk

Rainer Alexander Werner

Peter Hennenberger

Hans-Martin Hutmacher

Ralf Zolk

Heinz Vogt

Lothar Matthaei

Klaus-Dieter Ruempler

Hans J Geelhaar

Maria G Szucsanyi

Propylene/ethylene block copolymers are prepared by a continuous process in which, in each case in an agitated fixed bed of finely divided polymer from the gas phase, first (I) in a first polymerization zone, propylene is homopolymerized by feeding in a Ziegler-Natta catalyst system consisting of (1) a titanium component which contains titanium, magnesium, chlorine and a phthalic acid derivative, (2) an aluminumalkyl component and (3) a silane component, and (II) in a second polymerization zone, a mixture of propylene and ethylene is polymerized with the propylene homopolymer present in the reaction mixture obtained in the first polymerization zone by feeding in the said reaction mixture. In the process, (A) a titanium component (1) is used which is obtained by a method in which (1.1) first, (1.1.1) in a liquid hydrocarbon, (1.1.2) a finely divided magnesium halide, (1.1.3) an alkanol, (1.1.4) a certain phthalic acid derivative and (1.1.5) titanium tetrachloride are reacted with one another under certain conditions, (1.2) the solid intermediate obtained from (1.1) is extracted with titanium tetrachloride or a liquid alkylbenzene until the remaining solid substance has become substantially richer in magnesium, and (1.3) finally, the solid substance remaining in (1.2) is washed with an alkane in a certain manner, (B) a specific silane is used as (3), and (C) specifically selected polymerization parameters are employed, with relationships between the first and second polymerization zones.

Preparation of propylene/ethylene polymers of the toughened

A catalyst for the copolymerization of ethylene by the gas-phase fluidized-bed method is prepared by a process in which a titanium-containing and magnesium-containing active component, reacted with an alcohol as a complexing agent, is applied to a finely divided silica from homogeneous solution, in the presence of a polysiloxane, by evaporating the solvent, and the resulting homogeneous catalyst intermediate is then preactivated by treatment with the alkylaluminum compound and the Lewis base in an inert hydrocarbon solution, and the copolymers prepared using the above catalyst are employed for the production of films exhibiting little blocking.

Catalyst for the polymerization of ethylene, its preparation and the use

Finely divided ethane polymers are prepared using a Ziegler catalyst system consisting of (1) a titanium-containing catalyst component which has been obtained by (1.1) precipitation in an organic liquid comprising (1.1.1) a solution of titanium tetrachloride in a hydrocarbon, (1.1.2) a solution of a certain organoaluminum compound in a hydrocarbon and (1.1.3) an alpha-monoalkene, and (2) an aluminum-containing catalyst component. In this process, the component (1) used is a component where (1.1) precipitation has been carried out at relatively low temperatures in an organic liquid which has a relatively high viscosity at the precipitation temperature and conists of (1) a liquid hydrocarbon an (b) small amounts of a polymer of an alpha-monoalkene dissolved therein, with the provisos that (i) specific amounts of the organic liquid, of the organoaluminum compound and of the alpha-monoalkene are used per g mol of the titanium tetrachloride used in total, and (ii) per molar unit of the titanium tetrachloride used in total, specific amounts per minute are precipitated and specific amounts per minute of the alpha-monoalkene are introduced, and (1.2) the substance precipitated according to (1.1) has been reacted with a lithiumalkyl.

Preparation of ethene polymers using a ziegler catalyst system

Ethene homopolymers and ethene copolymers with minor amounts of higher .alpha.-monoolefins are prepared by polymerization of the monomer or monomers using a chromium trioxide catalyst which is obtained by a method in which (1) a finely divided, porous, silicate carrier is laden with (2) chromium trioxide or a chromium compound which is converted to chromium trioxide under the conditions of stage (3), and then (3) the intermediate resulting from stage (2) is heated in an oxygen-containing gas stream. In this process, a cocatalyst which consists of a lithiumalkyl used in addition to the chromium trioxide catalyst.

Preparation of homopolymers and copolymers of ethene using a chromium

Ethene polymerization by Phillips catalysis is carried out using (1) a supported catalyst, which is laden with chromium, phosphorus and aluminum, and (2) a cocatalyst, (1) being obtained by a method in which (1.1) a catalyst intermediate laden with chromium, phosphorus and aluminum is prepared from a silicate carrier, a selected chromium compound, a selected phosphorus compound and a selected aluminum compound, and then (1.2) the catalyst intermediate is heated in an oxygen-containing gas stream. In this process, the component (1) used is one which is obtained by a method in which, in each case in a specific manner, (1.1) in a first stage, (1.1.1) first a suspension is prepared from (1.1.1.1) a finely divided silicate carrier and (1.1.1.2) an inert organic solvent, (1.1.2) then, (1.1.2.1) in an inert organic solvent, (1.1.2.2) an organic chromium compound is combined with (1.1.2.3) an aluminum trialkyl, (1.1.3) then (1.1.3.1) the suspension resulting from (1.1.1) is combined with (1.1.3.2) a phosphoric acid or phosphite and (1.1.3.3) the product obtained from (1.1.2), (1.1.4) finally, the suspension obtained in (1.1.3) is evaporated to dryness, and then (1.2) in a second stage, first (1.2.1) the intermediate obtained from (1.1) is treated with a stream of nitrogen, then (1.2.2) the intermediate obtained from (1.2.1) is heated in an oxygen-containing gas stream, and finally (1.2.3) the intermediate obtained from (1.2.2) is treated with a stream of nitrogen, and both a lithiumalkyl and a boronalkyl are used as (2).

Preparation of homopolymers and copolymers of ethene by Phillips

A process for the continuous preparation of finely divided homopolymers and copolymers of ethene by catalytic polymerization in a circular tube reactor using a liquid alkane as reaction medium in which the ethene or ethene/comonomer mixture to be polymerized is present in dissolved form and the polymer formed is present in suspended form and running the reaction mixture as a cycle stream to which the feed materials are added by bleeding in and from which the polymer formed is withdrawn by bleeding out reaction mixture, comprising (a) maintaining the mean concentration C.sub.m of polymer in the cycle stream at a value within a certain range and (b) effecting the bleeding out of reaction mixture at a point of the cycle stream at which the concentration of polymer has a value which is lower than the mean concentration C.sub.m by a distinct and definite amount.

Preparation of finely divided homopolymers and copolymers of ethene

Acrylates or methacrylates I ##STR1## (A and B=C.sub.2 -C.sub.5 -alkylene, R.sup.1 =H, CH.sub.3) are prepared by reacting an acrylate or methacrylate II ##STR2## (R.sup.2 =C.sub.1 -C.sub.4 -alkyl) with a heterocycle III ##STR3## in the presence of titanium alcoholates chelate compounds of the metals titanium, zirconium, iron and zinc with 1,3-dicarbonyl compounds.

Preparation of acrylates and methacrylates

Ethane polymers are prepared by Phillips catalysis using (1) a supported catalyst which is laden with chromium, phosphorus and titanium and (2) a cocatalyst, (1) being obtained by a procedure in which (1.1) a catalyst intermediate laden with chromium, phosphorus and titanium is prepared from a silicate carrier, a selected chromium compound, a selected phosphorus compound and a selected titanium compound, and (1.2) the catalyst intermediate is then heated in an oxygen-containing gas stream. In the process, the supported catalyst (1) used is one which is obtained (using specific methods and substances in each case) by a procedure in which (1.1) in a first stage (1.1.1), a suspension is first prepared from (1.1.1.1) a finely divided silicate carrier and (1.1.1.2) an inert organic solvent, (1.1.2) a suspension is then prepared from (1.1.2.1) a finely divided chromium trioxide and (1.1.2.2) an inert organic solvent, (1.1.3) thereafter (1.1.3.1) the suspension resulting from (1.1.2) is combined with (1.1.3.2) a phosphate or phosphite, (1.1.4) then (1.1.4.1) the suspension obtained from (1.1.1) is combined with (1.1.4.2) the reaction product obtained in (1.1.3), (1.1.5) thereafter (1.1.5.1) the suspension formed in (1.1.4) is combined with (1.1.5.2) a titanate, (1.1.6) finally the suspension obtained in (1.1.5) is evaporated to dryness and then (1.2) in a second stage, (1.2.1) the intermediate obtained in (1.1) is first treated with a nitrogen stream, (1.2.2) an intermediate obtained in (1.2.1) is then heated in an oxygen-containing gas stream and finally (1.2.3) the intermediate obtained in (1.2.2) is treated with a nitrogen stream, and a lithiumalkyl is used as (2).

A process for the preparation of aqueous polymer dispersions which have a low film-forming temperature but still give films having a high block resistance, and the use of these polymer dispersions as binders for coating materials.

Preparation of polymer dispersions which form block-resistant films

Aqueous polyacrylate dispersions having improved flow characteristics are prepared by polymerizing esters of acrylic acid and/or methacrylic acid and alkanols of 1 to 10 carbon atoms, with or without admixture of styrene and/or vinyl esters and/or water-soluble monoolefinically unsaturated comonomers (the monomer feed being in the form of an emulsion), in aqueous emulsion in the presence of a free radical polymerization initiator, a protective colloid, a nonionic emulsifier and a regulator, at least a part of the protective colloid being introduced into an aqueous initial charge, and a water-soluble regulator being employed in the initial charge and in the feed.

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Neuhofen, Germany

Rudolf Mueller-Mall