1
Klaus Boettcher, Heinrich G Hoerdt, Wieland Zacher, Oskar Buechner: Manufacture of high pressure polyethylene. BASF Aktiengesellschaft, Keil & Witherspoon, May 8, 1979: US04153774 (19 worldwide citation)

A process for the high pressure polymerization of ethylene at elevated temperatures in a polymerization zone followed by transfer of the reaction mixture, through a cooling zone, into the separation zone. In this process, the pressure at the cooling zone outlet is periodically reduced briefly, at re ...


2
Klaus Pfleger, Klaus Boettcher, Oskar Buechner, Friedrich Kanne, Siegfried Kursawe, Wieland Zacher: Preparation of copolmers of ethylene with acrylic acid esters in a tubular reactor at above 500 bar. BASF Aktiengesellschaft, Keil & Weinkauf, November 29, 1988: US04788265 (18 worldwide citation)

Copolymers of ethylene with acrylates or solutions of free acrylic acid in acrylates are prepared in a continuously operated tubular polymerization system at high pressures and temperatures by feeding a mixture of ethylene, acrylate, initiator and, if appropriate, regulant into the polymerization sy ...


3
Klaus Pfleger, Klaus Boettcher, Oskar Buechner, Friedrich Kanne, Siegfried Kursawe: Preparation of copolymers of ethylene with vinyl esters in a tubular reactor at above 500 bar. BASF Aktiengesellschaft, Keil & Weinkauf, December 27, 1988: US04794004 (18 worldwide citation)

Copolymers of ethylene with vinyl esters are prepared in a continuously operated tubular polymerization system at high pressure and temperatures by feeding a mixture of ethylene, vinyl ester, initiator and, if appropriate, regulant into the polymerization system in the form of a mainstream at the in ...


4
Franz Georg Mietzner, Klaus Pfleger, Hans Gropper, Oskar Buechner, Klaus Boettcher, Wieland Zacher: Manufacture of copolymers of ethylene. BASF Aktiengesellschaft, Keil Thompson & Shurtleff, September 13, 1977: US04048411 (13 worldwide citation)

A process for the manufacture of copolymers of ethylene with vinyl acetate at pressures above 800 atmospheres and at from 150.degree. to 350.degree. C, using mean residence times of up to at most 100 seconds. The reaction mixture obtained from the polymerization is kept for from 2 to 10 minutes at f ...


5
Friedrich Urban, Oskar Buechner, Klaus Steigerwald, Karl Heinz Fauth, Heinz Gehrig: Production of mixtures of plastics materials. Badische Anilin & Soda Fabrik Aktiengesellschaft, Johnston Keil Thompson & Shurtleff, February 10, 1976: US03937772 (9 worldwide citation)

Production of a homogeneous mixture of plastics materials in powder form by subjecting a molten inhomogeneous mixture of two or more plastics to a maximum shear velocity of from 10.sup.4 to 10.sup.8 sec.sup.-.sup.1 for from 10.sup..sup.-2 to 10.sup..sup.-6 seconds; the pulverulent mixtures obtained ...


6
Friedrich Urban, Oskar Buechner, Ulrich Hartig, Hans Gropper: Manufacture of ethylene polymers in a two-zone tubular reactor at pressure above 500 bars. BASF Aktiengesellschaft, Keil Thompson & Shurtleff, February 28, 1978: US04076919 (8 worldwide citation)

Ethylene polymers are manufactured in a tubular reactor under high pressure and at high temperatures in the presence of polymerization initiators. The polymerization is carried out in two different zones of the reactor, a mixture of ethylene, oxygen and regulator being fed into the first zone and a ...


7
Rolf Becker, Klaus Borho, Oskar Buechner, Hans Gropper, Ulrich Hartig: Process for letting down ethylene high pressure polymerization systems. BASF Aktiengesellschaft, Keil Thompson & Shurtleff, September 19, 1978: US04115638 (8 worldwide citation)

The invention relates to a process for rapidly letting-down the pressure in continuous high pressure polymerization systems for the polymerization of ethylene. In this process, the let-down hot reaction mixture is passed into an expansion vessel in such a way that the jet of let-down hot reaction mi ...


8
Wieland Zacher, Klaus Pfleger, Klaus Boettcher, Ronald Skorczyk, Oskar Buechner: Manufacture of ethylene copolymers. BASF Aktiengesellschaft, Keil & Witherspoon, August 12, 1980: US04217431 (7 worldwide citation)

A continuous process for the manufacture of ethylene copolymers under high pressure and at high temperature in a polymerization zone, with transfer of the reaction mixture into a high pressure product isolation zone and from there into a low pressure product isolation zone, and recycling of the unco ...


9
Franz Georg Mietzner, Oskar Buechner, Klaus Steigerwald, Gottfried Schlichthaerle, Friedrich Urban: Multi-stage isolation of high pressure polyethylene. BASF Aktiengesellschaft, Keil Thompson & Shurtleff, May 2, 1978: US04087602 (7 worldwide citation)

A process for the manufacture of ethylene polymers by homopolymerization and copolymerization of ethylene at pressures of from 500 to 5,000 bars and at from 50.degree. to 450.degree. C, with subsequent isolation of the polymers in high pressure product isolation zones and low pressure product isolat ...


10
Oskar Buechner, Wolfgang Gruber: Preparation of propylene/ethylene polymers. BASF Aktiengesellschaft, Keil & Weinkauf, April 9, 1991: US05006600 (6 worldwide citation)

Propylene/ethylene polymers are prepared by a process in which, in each case in the presence of hydrogen and by means of gas phase polymerization, first (A), in a first polymerization zone, propylene is homopolymerized, and the resulting propylene homopolymer is introduced into (B) a second polymeri ...