Patents by Inventor Gunter Pipper

Gunter Pipper has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).

  • Patent number: 5030709
    Abstract: Copolyamides which contain units of the formula --NH--(CH.sub.2).sub.4 --NH are prepared by a continuous process in whicha) an aqueous solution of from 5 to 80% by weight of a salt of 1,4-diaminobutane, and dicarboxylic acids and from 20 to 95% by weight of further polyamide-forming starting materials are heated to a temperature above the melting point of the copolyamide, with the addition of diamines and with vaporization of water, under superatmospheric pressure,b) the vapor phase and prepolymer are brought into intimate contact with one another,c) the prepolymer is separated from the vapor phase and the polymer is discharged after a total residence time of not more than 30 minutes, andd) diamines are separated off from the vapor phase and recycled to a).
    Type: Grant
    Filed: March 29, 1990
    Date of Patent: July 9, 1991
    Assignee: BASF Aktiengesellschaft
    Inventors: Gunter Pipper, Eckhard M. Koch
  • Patent number: 4994550
    Abstract: A process for the continuous preparation of polytetramethylene adipamide, in which(a) an aqueous solution of the salt of 1,4-diaminobutane and adipic acid is heated with evaporation of water to form a vapor phase and a molten prepolymer,(b) the said prepolymer and vapor phase are passed, to effect thorough mixing thereof, through a mass transfer zone equipped with baffles and located immediately downstream of stage (a),(c) the said vapor phase is separated from the polymer in a separting zone and the polymer is discharged in the form of a melt capable of being granulated, with the proviso that the total residence time in stages (a), (b) and (c) is less than 5 minutes, and(d) pyrrolidine is distilled off from the vapor phase separated in stage (c) and 1,4-diaminobutane is recycled to the vaporizing stage (a).
    Type: Grant
    Filed: March 16, 1990
    Date of Patent: February 19, 1991
    Assignee: BASF Aktiengesellschaft
    Inventors: Gunter Pipper, Eckhard M. Koch
  • Patent number: 4973655
    Abstract: A process for the continuous production of linear thermoplastic polyesters comprises the following steps:(a) passing a transesterification or esterification product of an aliphatic or aromatic dicarboxylic acid having a molecular weight of <300 or an ester-forming derivative thereof with an aliphatic or cycloaliphatic diol having a molecular weight of <250 which may additionally contain a poly(alkylene oxide) glycol having a molecular weight of 400 to 4000 at from 250.degree. to 360.degree. C. under a pressure of 0.5 to 20 mmHg downward in the course of a residence time of from 3 to 10 minutes through an essentially upright tubular precondensation zone equipped with internal fitments having a free surface area of from 0.3 to 1.5 m.sup.2 /l to form a precondensate and a vaporous diol having a molecular weight <250,(b) separating into a precondensate and vaporous diol and(c) further condensing the precondensate in the bottom phase at from 240.degree. to 290.degree. C. under a pressure of from 0.
    Type: Grant
    Filed: June 12, 1989
    Date of Patent: November 27, 1990
    Assignee: BASF Aktiengesellschaft
    Inventors: Gunter Pipper, Georg N. Simon, Gerhard Heinz, Peter Ittemann, Gisbert Schleier
  • Patent number: 4970255
    Abstract: Flameproofed thermoplastic molding materials contain(A) 40-99% by weight of a partly aromatic amide copolymer consisting essentially of(a.sub.1) 40-50% by weight of units derived from terephthalic acid and hexamethylenediamine,(a.sub.2) 0-50% by weight of units derived from .epsilon.-caprolactam and(a.sub.3) 0-60% by weight of units derived from adipic acid and hexamethylenediamine,components (a.sub.2) and/or (a.sub.3) accounting altogether for not less than 10% by weight of the total number of units,(B) 1-30% by weight of a flameproofing combination of(b.sub.1) 40-97% by weight of red phosphorus,(b.sub.2) 1-50% by weight of an inorganic compound of a divalent or tetravalent metal,(b.sub.3) 1-40% by weight of an organic mono- or dicarboxylic acid and(b.sub.
    Type: Grant
    Filed: July 10, 1989
    Date of Patent: November 13, 1990
    Assignee: BASF Aktiengesellschaft
    Inventors: Horst Reimann, Gunter Pipper, Hans-Peter Weiss, Christoph Plachetta, Eckhard M. Koch, Gerd Blinne, Walter Goetz, Peter Steiert
  • Patent number: 4816557
    Abstract: Caprolactam and oligomers thereof are removed from nylon granules containing same in a process wherein(a) nylon granules are introduced at not less than 100.degree. C. at the top of a substantially upright treatment zone,(b) nylon granules are passed downward through the treatment zone while being heated to from 130.degree. to 210.degree. C.,(c) superheated steam is passed at from 130.degree. to 210.degree. C. upward through the treatment zone,(d) dry nylon granules are withdrawn at the bottom end of the treatment zone and steam containing caprolactam and oligomers thereof is withdrawn at the top of the treatment zone,(e) the caprolactam and oligomers thereof containing steam thus obtained is passed through a column giving an aqueous solution of caprolactam and oligomers thereof as bottom product and virtually caprolactam-free steam as overhead product.
    Type: Grant
    Filed: March 11, 1988
    Date of Patent: March 28, 1989
    Assignee: Basf Aktiengesellschaft
    Inventors: Gunter Pipper, Claus Cordes
  • Patent number: 4578455
    Abstract: A process for removing volatile constituents from polymer melts or pastes, wherein the polymer or paste containing the volatile constituents is passed, with continuous formation of fresh surfaces, through one or more zones in which the volatile constituents evaporate, and the volatile constituents are removed from the zone or zones in which they evaporate through, in each case, a plurality of porous orifices, and an apparatus for carrying out said process.
    Type: Grant
    Filed: April 18, 1985
    Date of Patent: March 25, 1986
    Assignee: BASF Aktiengesellschaft
    Inventors: Gunter Pipper, Siegfried Riegger, Josef G. Floss
  • Patent number: 4540772
    Abstract: Nylons are prepared by a continuous process in which, in a precondensation zone, an aqueous solution of a salt of a dicarboxylic acid of 6 to 18 carbon atoms and a diamine of 6 to 18 carbon atoms is heated to 250.degree.-300.degree. C. under superatmospheric pressure, with simultaneous vaporization of water and formation of a prepolymer, the prepolymer and the vapor are separated, and the former is fed into a polycondensation zone and condensed under superatmospheric pressure of from 1 to 10 bar and at from 250.degree. to 300.degree. C., wherein the aqueous salt solution is condensed under superatomspheric pressure of from 1 to 10 bar in the first third of the tubular precondensation zone provided with baffles, until the degree of conversion is not less than 93%, and the prepolymer and the vapor phase are brought into intimate contact with one another in the remaining two thirds of the precondensation zone.
    Type: Grant
    Filed: June 15, 1984
    Date of Patent: September 10, 1985
    Assignee: BASF Aktiengesellschaft
    Inventors: Gunter Pipper, Franz Schmidt, Rainer Theysohn, Siegfried Riegger, Eduard Heil, Hermann Fischer, Richard Thoma, Paul Matthies
  • Patent number: 4539391
    Abstract: Polylactams are prepared continuously by a process in which a lactam containing from 1 to 25% by weight of water is heated in a prepolymerization zone under a pressure of from 1 to 10 bar at from 220.degree. to 280.degree. C. for 1 to 10 minutes, water being vaporized at the same time, with the proviso that the degree of conversion on emergence from the prepolymerization zone is not less than 85%, the prepolymer and the vapor are separated continuously, and the prepolymer is passed into a polymerization zone and is polymerized further under superatmospheric pressure at from 240.degree. to 290.degree. C.
    Type: Grant
    Filed: February 21, 1984
    Date of Patent: September 3, 1985
    Assignee: BASF Aktiengesellschaft
    Inventors: Gunter Pipper, Rainer Theysohn, Franz Zahradnik
  • Patent number: 4537949
    Abstract: Nylons are prepared by a continuous process in which, in an evaporator zone, an aqueous solution of a salt of a dicarboxylic acid of 6 to 18 carbon atoms and a diamine of 6 to 18 carbon atoms is heated to 250.degree.-300.degree. C. under superatmospheric pressure, with simultaneous vaporization of water and formation of a prepolymer, the prepolymer and the vapors are separated continuously, the vapors are rectified and the entrained diamines are recycled, and the prepolymer is fed to a polycondensation zone and subjected to polycondensation under superatmospheric pressure of from 1 to 10 bar and at from 250.degree. to 300.degree. C., wherein the aqueous salt solution is heated under superatmospheric pressure of from 1 to 10 bar during a residence time of less than 60 seconds, with the proviso that, on leaving the evaporator zone, the degree of conversion is not less than 93% and the water content of the prepolymer is not more than 7% by weight.
    Type: Grant
    Filed: June 14, 1984
    Date of Patent: August 27, 1985
    Assignee: BASF Aktiengesellschaft
    Inventors: Franz Schmidt, Gunter Pipper, Josef G. Floss, Franz Zahradnik