Patents Assigned to Cassella Aktiengesellschaft
  • 3-(4-Alkoxycarbonylpiperazin-1-yl)-sydnonimines, a process for their preparation and use
    Patent number: 4551454
    Abstract: Pharmacologically-active 3-aminosydnonimines (which are optionally substituted in the N.sup.6 -position) and their physiologically-acceptable acid-addition salts are compounded into standard dosage-form medicament compositions and are useful for prophylaxis for and treatment of cardiovascular-system disorders, such as high blood pressure and angina pectoris. The 3-aminosydnonimines are 3-[4-(lower alkoxy)carbonylpiperazin-1-yl]sydnonimines and 3-[N-(lower alkyl)-N-(tetrahydro-3-thienyl S,S-dioxide)]-sydnonimines.
    Type: Grant
    Filed: May 6, 1983
    Date of Patent: November 5, 1985
    Assignee: Cassella Aktiengesellschaft
    Inventors: Karl Schonafinger, Rudi Beyerle, Helmut Bohn, Melitta Just, Piero A. Martorana, Rolf-Eberhard Nitz
  • Water soluble copolymers
    Patent number: 4551513
    Abstract: New copolymers soluble in water and aqueous acids are disclosed comprising in a statistical distribution in the macromolecule at least 5% by weight of entities containing a formylamino functionality and at least 10% by weight of entities containing an amino carbonyl functionality, which are stable in high concentrations of Bronsted-Lowery acids and can be used as friction reducers in the stimulation of oil or gas wells.
    Type: Grant
    Filed: October 18, 1984
    Date of Patent: November 5, 1985
    Assignees: Cassella Aktiengesellschaft, Dresser Industries, Inc.
    Inventors: Friedrich Engelhardt, Klaus Kuhlein, Ulrich Riegel, Sigmar von Halasz, Jeffery C. Dawson, Anthony R. Reed
  • Encapsulated salts of acid particles wherein the salt particles are surrounded by a polyurethane/polyurea casing
    Patent number: 4547429
    Abstract: Encapsulated salts of organic or inorganic acid particles having sparing solubility in water wherein the salt particles are surrounded by a pressure-resistant, elastic, abrasion-resistant polyurethane/polyurea casing, the ratio by weight of salt to the polyurethane component of the casing material being 1:0.2 to 1:2.5, are produced by emulsifying a mixture of 83 to 28% by weight of the salt to be encapsulated and 17 to 72% by weight of a polyurethane prepolymer containing free isocyanate groups in water in the presence of a protective colloid and reacting the emulsified prepolymer with the equivalent amount of polyamine at temperatures from 0.degree. to 80.degree. C., with vigorous mixing.
    Type: Grant
    Filed: September 6, 1984
    Date of Patent: October 15, 1985
    Assignee: Cassella Aktiengesellschaft
    Inventors: Ulrich Greiner, Karl-Heinz Keil, Rudolf Heinrich, Konrad Albrecht
  • Modified aminoplast, its preparation and its use
    Patent number: 4535031
    Abstract: Modified aminoplast resin comprising:(a) 60 to 99.5% by weight of an aminoplast precondensate which has been etherified with a lower alkanol to an extent not exceeding 10% and(b) 0.5 to 40% by weight of a modifying agent which comprises a mixture of (i) a water-soluble polyester prepared from carboxylic acids with at least one carboxyl and dihydric or polyhydric alcohols, and (ii) sufficient free diol or polyol whereby the mixture has a ratio of the sum of free and esterified hydroxyls of 0.8 to 4.5 moles for each mole of the sum of free and esterified carboxyls which resins are useful in impregnating webs for producing laminates and panels of wood-based materials.
    Type: Grant
    Filed: March 5, 1984
    Date of Patent: August 13, 1985
    Assignee: Cassella Aktiengesellschaft
    Inventors: Peter Dorries, Thomas Gotze, Steffen Piesch, Manfred Schon, Gunther Wulff, Karl Hintermeier
  • Carrier materials coated with amino resin dispersions, and their further processing into laminates
    Patent number: 4533590
    Abstract: A carrier web coated with amino resin wherein at least one surface is resinated is produced by applying a spreadable amino resin dispersion containing 70-90% by weight of amino resin and 30-10% by weight of a liquid dispersant to at least one surface of an uncoated carrier web in an apparatus comprising:(a) unwinding station for unwinding uncoated carrier webs from rotatable supply rolls,(b) means for conveying the uncoated webs comprising a plurality of cooperating pressure rolls rotatably mounted in parallel relationship,(c) a coating means for applying a brushable amino resin dispersion to the web, and(d) a belt press for compression-molding and curing the coated web.
    Type: Grant
    Filed: May 30, 1984
    Date of Patent: August 6, 1985
    Assignees: Cassella Aktiengesellschaft, Theodor Hymmen KG
    Inventors: Peter Dorries, Helmut Wahl
  • Amino resin dispersions
    Patent number: 4532292
    Abstract: A carrier web coated with amino resin wherein at least one surface is resinated is produced by applying a spreadable amino resin dispersion containing 70-90% by weight of amino resin and 30-10% by weight of a liquid dispersant to at least one surface of an uncoated carrier web in an apparatus comprising:(a) unwinding station for unwinding uncoated carrier webs from rotatable supply rolls,(b) means for conveying the uncoated webs comprising a plurality of cooperating pressure rolls rotatably mounted in parallel relationship,(c) a coating means for applying a brushable amino resin dispersion to the web, and(d) a belt press for compression-molding and curing the coated web.
    Type: Grant
    Filed: June 25, 1984
    Date of Patent: July 30, 1985
    Assignees: Cassella Aktiengesellschaft, Theodor Hymmen KG
    Inventors: Peter Dorries, Helmut Wahl
  • N-phenoxypropanol-N'-pyridazinyl ethylendiamines as .beta.-receptor blockers
    Patent number: 4532239
    Abstract: Basically-substituted pyridazines of the formula: ##STR1## wherein R.sup.1, R.sup.2 and R.sup.3, independently of one another, denote hydrogen, halogen, hydroxyl, nitro, trifluoromethyl, alkyl, alkoxyalkyl, alkenyl, alkynyl, cycloalkyl, cycloalkenyl, phenyl, alkoxy, hydroxyalkoxy, alkoxy-alkoxy, alkenyloxy, alkynyloxy, cycloalkoxy, phenalkoxy, alkanoyl, alkanoylamino and --NH--CO--R.sup.9, R.sup.9 representing morpholino, piperidino or 1-pyrrolididinyl, or an optionally substituted ureido radical, R.sup.4 denotes hydrogen or lower alkyl and W denotes hydrogen, chlorine or bromine; and the acid-addition salts thereof are useful alone or in pharmaceutical preparations for treating cardiac complaints, circulatory complaints and high blood pressure. Several methods for preparing the basically-substituted pyridazines are also provided.
    Type: Grant
    Filed: December 20, 1983
    Date of Patent: July 30, 1985
    Assignee: Cassella Aktiengesellschaft
    Inventors: Thomas Raabe, Helmut Bohn, Piero A. Martorana, Rolf-Eberhard Nitz
  • Crosslinking agents for water-swellable polymers
    Patent number: 4522997
    Abstract: Crosslinked, water-swellable copolymers are produced with a crosslinking agent comprising an N-(2'alkenyl)-3-methylenepyrrolidin-2-one of the formula ##STR1## wherein R.sup.1, R.sup.2 and R.sup.3 are the same or different and each is hydrogen or alkyl having 1 to 6 carbon atoms.
    Type: Grant
    Filed: June 6, 1983
    Date of Patent: June 11, 1985
    Assignee: Cassella Aktiengesellschaft
    Inventors: Hermann Schmitz, Klaus Kuhlein
  • High molecular weight water-soluble polymers useful in deoiling sand and rock masses
    Patent number: 4521579
    Abstract: Sand or rock masses containing mineral oil are deoiled with a deoiling agent containing an aqueous solution of a water-soluble copolymer which is a random distribution of 5 to 60% of weight of units of the formula ##STR1## 2 to 40% by weight of units of the formula ##STR2## 38 to 93% by weight of units of the formula ##STR3## and partial hydrolysates thereof, wherein when R.sup.1 is hydrogen, R.sup.2 is hydrogen, methyl or ethyl, Y is --CO--NH--C(CH.sub.3).sub.2 --CH.sub.2 -- or a direct bond, and X.sup..sym. is a cation; when R.sup.1 and R.sup.2 are identical or different, each is hydrogen, methyl, ethyl or, together are trimethylene, Y is --CO--NH--C(CH.sub.3).sub.2 --CH.sub.2 -- and X.sup..sym. is a cation.
    Type: Grant
    Filed: March 29, 1983
    Date of Patent: June 4, 1985
    Assignee: Cassella Aktiengesellschaft
    Inventors: Friedrich Engelhardt, Hermann Schmitz, Walter Gulden, Jorg Hax
  • Metal chelates of water soluble copolymers
    Patent number: 4518745
    Abstract: Metal chelates of water soluble copolymers with polyvalent metal ions contain a statistical distribution of 1-86% by weight of structural units of the formula ##STR1## 9-80% by weight of units of the formula ##STR2## 5-90% by weight of units of the formula ##STR3## and up to 30% by weight of one or more units of the formulae ##STR4## wherein R.sup.1 is alkyl having 1 to 4 carbon atoms; R.sup.2 and R.sup.5 independently of one another are each hydrogen or methyl;R.sup.3 and R.sup.4 independently of one another are each hydrogen, methyl or ethyl or together are a trimethylene or pentamethylene;Y is a direct bond, phenylene or a moiety of the formula --CO--NH--C(CH.sub.3).sub.2 --CH.sub.2 --; andX.sup..sym. is a cation or H.sup..crclbar.
    Type: Grant
    Filed: November 25, 1983
    Date of Patent: May 21, 1985
    Assignee: Cassella Aktiengesellschaft
    Inventors: Friedrich Engelhardt, Ulrich Greiner
  • Process for preparing 2-chlorobenzoxazoles
    Patent number: 4517370
    Abstract: In the process for preparing 2-chlorobenzoxazoles of the formula ##STR1## wherein each of R.sup.1, R.sup.2, R.sup.3 and R.sup.4 is independently of one another, H, chloro or alkyl having 1 to 4 carbon atoms, which comprises reacting chlorine with 2-mercaptobenzoxazoles of the formula ##STR2## wherein the improvement comprises providing a melt of previously prepared 2-chloro-benzoxazole, adding the 2-mercaptobenzoxazole reactant to the 2-chlorobenzoxazole melt and simultaneously or subsequently passing chlorine into the melt, with the proviso that substituents R.sup.1 to R.sup.4 are identical in both the 2-chlorobenzoxazole melt and the 2-mercaptobenzoxazole reactant.
    Type: Grant
    Filed: February 18, 1983
    Date of Patent: May 14, 1985
    Assignee: Cassella Aktiengesellschaft
    Inventors: Johannes Becherer, Klaus Kuhlein, Ulrich Kussmaul
  • Cross-linkable and cross linked macromolecular compositions wherein cross-linking is by structural bridges of the formula --NR.sup.x --CH.dbd.N--CO-- and their preparation
    Patent number: 4507440
    Abstract: The present invention relates to macromolecular compositions crosslinked by a novel bridge having the formula --NR.sup.x --CH.dbd.N--CO--. This novel bridge is obtained by reacting a macro-molecule, preferably a polymer, having at least two amidocarbonyl groups with a compound having at least two formylamido groups in an aqueous medium under highly acidic conditions. The crosslinking bridge formed by the reaction of this invention is produced in accord with the following formula: ##STR1## Compositions containing macromolecules having at least two amidocarbonyl groups and a compound having at least two formylamido groups can act as viscosifying or gelling agents for aqueous acids where when added to aqueous acids, crosslinking occurs. Acids gelled in this manner have important use in the recovery of oil and natural gas from subterranean formations.
    Type: Grant
    Filed: July 19, 1982
    Date of Patent: March 26, 1985
    Assignees: Cassella Aktiengesellschaft, Dresser Industries, Inc.
    Inventors: Friedrich Engelhardt, Steffen Piesch, Juliane Balzer, Jeffery C. Dawson
  • Azo dyestuff dischargeable to white
    Patent number: 4505856
    Abstract: Azo dyestuff free from groups imparting solubility in water are used in the process for the production of white or variously colored designs on a colored substrate on textile material wherein the dyestuff is dischargeable to white and is of the formulaD--N.dbd.N--K--NHSO.sub.2 Rwhereinwherein D is 6-nitrobenzthiazol-2-yl, 5-nitrobenzisothiazol-3-yl, a substituted phenyl, a substituted thiazole or a substituted thiophene moiety;K is a 1,4-phenylene, 1,4-naphthylene, 2,5-thiazolylene or 2,5-thienylene; andR is alkyl, substituted alkyl, alkenyl, substituted alkenyl, phenyl or substituted phenyl.
    Type: Grant
    Filed: June 10, 1983
    Date of Patent: March 19, 1985
    Assignee: Cassella Aktiengesellschaft
    Inventors: Ulrich Buhler, Joachim Ribka, Horst Tappe, Kurt Roth
  • Water soluble copolymers for use in fracture-acidizing of wells
    Patent number: 4500437
    Abstract: New copolymers soluble in water and aqueous acids are disclosed comprising in a statistical distribution in the macromolecule at least 5% by weight of entities containing a formylamino functionality and at least 10% by weight of entities containing an amino carbonyl functionality, which are stable in high concentrations of Bronsted-Lowery acids and can be used as friction reducers in the stimulation of oil or gas wells.
    Type: Grant
    Filed: September 23, 1982
    Date of Patent: February 19, 1985
    Assignees: Cassella Aktiengesellschaft, Dresser Industries, Inc.
    Inventors: Friedrich Engelhardt, Klaus Kuhlein, Ulrich Riegel, Sigmar von Halasz, Jeffery C. Dawson, Anthony R. Reed
  • Water soluble, crosslinkable polymer compositions, their preparation and use
    Patent number: 4499232
    Abstract: The present invention relates to macromolecular compositions crosslinked by a novel bridge having the formula --NR.sup.x --CH.dbd.N--CO--. This novel bridge is obtained by reacting a macro-molecule, preferably a polymer, having at least two amidocarbonyl groups with a compound having at least two formylamido groups in an aqueous medium under highly acidic conditions. The crosslinking bridge formed by the reaction of this invention is produced in accord with the following formula: ##STR1## Compositions containing macromolecules having at least two amidocarbonyl groups and a compound having at least two formylamido groups can act as viscosifying or gelling agents for aqueous acids where when added to aqueous acids, crosslinking occurs. Acids gelled in this manner have important use in the recovery of oil and natural gas from subterranean formations.
    Type: Grant
    Filed: September 24, 1982
    Date of Patent: February 12, 1985
    Assignees: Cassella Aktiengesellschaft, Dresser Industries, Inc.
    Inventors: Friedrich Engelhardt, Steffen Piesch, Juliane Balzar, Jeffery C. Dawson
  • Softener emulsion, a process for its preparation, and its application
    Patent number: 4488974
    Abstract: A softener emulsion for making textiles water-repellent and improving their handle is prepared by melting a mixture ofR--NH--CO--NH--CH.sub.2 --(O--CH.sub.2 --CH.sub.2).sub.n --OR.sup.1,R.sup.2 --CO--NH--CH.sub.2 --(O--CH.sub.2 --CH.sub.2).sub.n --OR.sup.1,R--NH--CO--NH--CH.sub.2 OH andR.sup.2 --CO--NH--CH.sub.2 OHtogether with an anionic emulsifier and emulsifying the melt into an emulsion with water and alkaline earth metal ions.
    Type: Grant
    Filed: November 17, 1983
    Date of Patent: December 18, 1984
    Assignee: Cassella Aktiengesellschaft
    Inventors: Karl-Heinz Keil, Ulrich Greiner, Georg-Wolfgang Eckardt, Volker Kohler
  • Process for the preparation of sulphur dyestuffs of the phthalocyanine series
    Patent number: 4486350
    Abstract: Preparation of phthalocyanine sulphur dyestuffs is improved by reducing phthalocyaninesulphochlorides in the presence of hydriodic acid and a non-free metal reducing agent which converts iodine into hydriodic acid.
    Type: Grant
    Filed: March 28, 1983
    Date of Patent: December 4, 1984
    Assignee: Cassella Aktiengesellschaft
    Inventors: Wolfgang Bauer, Klaus Kuhlein, Gert Nagl
  • Process for the preparation of optionally-substituted 1,2,3,4-tetrahydro-9-cyanomethylcarbazol-1-ones
    Patent number: 4485240
    Abstract: In a process for the preparation of optionally-substituted 1,2,3,4-tetrahydro-9-cyanomethylcarbazol-1-ones of the formula ##STR1## wherein R denotes hydrogen, halogen, alkyl or alkoxy, by cyano-methylating optionally substituted 1,2,3,4-tetrahydrocarbazol-1-ones of the formula ##STR2## wherein R has the meanings mentioned above, the starting material of formula II is reacted, in a two-phase system consisting of water and a water-immiscible organic solvent, in the presence of a strong base and a known phase transfer catalyst, with a cyanomethylating agent of the formulaR.sup.1 --CH.sub.2 --CN (III),wherein R.sup.1 denotes halogen or a radical of the formula R.sup.2 --SO.sub.2 --O-- and R.sup.2 represents alkyl, phenyl or substituted phenyl.
    Type: Grant
    Filed: April 19, 1983
    Date of Patent: November 27, 1984
    Assignee: Cassella Aktiengesellschaft
    Inventors: Heinz Bender, Veit Buch, Rudi Beyerle, Klaus Kuhlein
  • Dyestuff containing at least three azo bridges
    Patent number: 4485042
    Abstract: Leathers can be advantageously dyed with water-soluble polyazo dyestuffs having, in the form of the free acid, the formula ##STR1## wherein A is a member of the benzene, naphthalene or heterocyclic series;B has the formula ##STR2## n is the number 1 or 2; m is a number from 1 to 4;X is hydroxyl or amino;Y is hydroxyl or amino but X differs from Y;Z is hydroxyl or amino unsubstituted or substituted by alkyl having 1 to 4 carbon atoms, alkanoyl having 1 to 4 carbon atoms or by a moiety of the formula ##STR3## R.sup.1 is hydrogen, alkyl having 1 to 4 carbon atoms, alkoxy having 1 to 4 carbon atoms or alkoxyalkoxy having 3 to 7 carbon atoms; andR.sup.2 and R.sup.3 independently of one another are each hydrogen or alkyl having 1 to 4 carbon atoms.
    Type: Grant
    Filed: August 20, 1982
    Date of Patent: November 27, 1984
    Assignee: Cassella Aktiengesellschaft
    Inventors: Norbert Armbrecht, Wolfgang Bauer, Joachim Ribka
  • Preparation of anilino azo carbazole dyestuffs prepared by diazotization by nitrosylsulphuric acid in acetic acid
    Patent number: 4472307
    Abstract: An improved process for the preparation of azo dyestuffs of the formula ##STR1## comprising diazotizing a 2-halo-4-nitroaniline at 10.degree. to 35.degree. C. in 70 to 100 percent by weight strength acetic acid by means of nitrosylsulphuric acid, adjusting the acetic acid content of the resulting diazo solution to 60 to 85% by the addition of water, and at a temperature from 15.degree. to 45.degree. C. adding an appropriate carbazole to the diazo solution as a solid or in the form of a suspension in 60 to 100 percent strength by weight acetic acid and coupling the carbazole to the diazotized amine to produce said azo dyestuff and isolating the dyestuff.
    Type: Grant
    Filed: August 20, 1982
    Date of Patent: September 18, 1984
    Assignee: Cassella Aktiengesellschaft
    Inventors: Ulrich Buhler, Wolfgang Bodenstedt, Heinz Hanel, Eberhardt Hebestreit, Horst Tappe