Showing papers by "Rhône-Poulenc published in 1972"

Artificial kidney and a method of ultrafiltering a liquid

Abstract: A method of ultrafiltration and an artificial kidney therefor, in which a membrane which is capable of simultaneous ultrafiltration and dialysis of blood is arranged to form a portion of the wall of a constant volume, closed loop vessel. A dialysis liquid is circulated in the vessel, while blood is passed on the opposite face of the membrane, and a fraction of the dialysis liquid is withdrawn from the vessel at a predetermined rate. The remainder of the dialysis liquid is kept at a constant temperature and is regenerated.

Process for the preparation of anisotropic semi-permeable membranes of polyaryl ether/sulphones

Abstract: Anisotropic sulphonated polyaryl ether/sulphone membranes having good salt rejection and flow rates making them particularly suitable for use in osmosis and ultrafiltration are provided by casting a solution of the polymer on a support, immersing the supported film in a coagulating bath and recovering the membrane produced, in which A. THE SULPHONATED POLYARYL ETHER/SULPHONE USED POSSESSES BETWEEN ABOUT 0.1 AND 2 MEG/G OF SULPHONIC ACID GROUPS AND A REDUCED SPECIFIC VISCOSITY OF BETWEEN ABOUT 40 AND 200 CM3/G (MEASURED AS A 2 G/L SOLUTION IN DIMETHYLFORMAMIDE AT 25*C.); b. the concentration of the casting solution is between about 5 and 60% w/v of solution; C. THE COAGULATION BATH CONSISTS OF EITHER WATER OR AN AQUEOUS SOLUTION CONTAINING ABOUT 0.1 TO 10% BY WEIGHT OF AN AMINE SALT OR A QUATERNARY AMMONIUM SALT WHICH IS SOLUBLE IN WATER AND IN THE POLYMER SOLUTION; D. THE TEMPERATURE OF THE COAGULATION BATH IS BETWEEN ABOUT 0* AND 100*C.; e. the period of immersion in the coagulation bath is between about 30 seconds and 60 minutes; F. THE IMMERSION IN THE COAGULATION BATH IS PRECEDED BY GELLING THE POLYMER LAYER; AND G. THE CASTING SOLUTION OPTIONALLY CONTAINS FROM ABOUT 0.1 TO 10% BY WEIGHT OF AN AMINE SALT OR A QUATERNARY AMMONIUM SALT WHICH IS SOLUBLE IN WATER AND IN THE POLYMER SOLUTION.

Pyrrolo (3,4-b) pyrazine derivatives

Abstract: The new compounds of the formula: WHEREIN A is a phenyl, pyridyl, pyridazinyl or 2-, 3-or 4quinolyl radical optionally substituted by halogen, alkyl of 1 through 4 carbon atoms, alkoxy of 1 through 4 carbon atoms, cyano and nitro, and n is zero or 1, possess pharmacological properties, and are particularly active as tranquillisers and anti-convulsant agents.

Separation apparatus using ultrafiltration

Abstract: Apparatus is provided for the purification of a liquid, especially blood, which comprises: A. AN ULTRAFILTRATION CELL AND AN ULTRAFILTRATION MEMBRANE DIVIDING SAID CELL INTO TWO COMPARTMENTS, AN INLET AND AN OUTLET FOR SAID FIRST COMPARTMENT FOR THE LIQUID TO BE TREATED AND AN OUTLET FOR THE ULTRAFILTERED LIQUID FOR SAID SECOND COMPARTMENT; B. MEANS FOR ESTABLISHING IN THE FIRST COMPARTMENT OF SAID ULTRAFILTRATION CELL A PRESSURE HIGHER THAN THAT PREVAILING IN THE SECOND COMPARTMENT OF THE CELL; AND C. A DIALYSER AND AN IONIC MEMBRANE SEPARATING SAID DIALYSER INTO TWO COMPARTMENTS, AN INLET FOR SAID FIRST COMPARTMENT CONNECTED TO THE OUTLET FROM THE SECOND COMPARTMENT OF THE ULTRAFILTRATION CELL AND AN OUTLET FOR SAID FIRST COMPARTMENT CONNECTED TO THE OUTLET OF THE FIRST COMPARTMENT OF THE ULTRAFILTRATION CELL, THE SECOND COMPARTMENT OF SAID DIALYSER BEING ITSELF EQUIPPED WITH AN INLET AND AN OUTLET.

Preparation of glyoxylic acid

Abstract: In the cathodic reduction of oxalic acid to glyoxylic acid production of hydrogen is reduced when the catholyte contains oxalic acid and 0.001 percent - 1 percent of an adjuvant which is a tertiary amine or quaternary ammonium derivative having more than 11 carbon atoms and, the nitrogen of which is not part of an unsaturated heterocyclic ring, or a heterocyclic tertiary amine or quaternary ammonium derivative thereof, the heterocyclic ring being unsaturated, containing a nitrogen atom and at least five carbon atoms.

Surgically implantable prosthetic duct for the removal of biological liquids

Abstract: A duct for the removal of biological liquids, especially urine, in the form of a tubular body having internal and external surfaces, at least, of silicone elastomer. Near its upper end, e.g., for connection to a ureter, the body is surrounded by a woven or knitted textile sheath, which is secured by silicone elastomer adhesive to the body and is used as a suturing member for securing the duct to the ureter. Near its lower end the body is provided with a similar sheath or a radially outwardly projecting flange to secure it, e.g., to a bladder.

Preparation of anisotropic semi-permeable membranes of polyaryl ether/sulphones

Abstract: Anisotropic sulphonated polyaryl ether/sulphone membranes having good salt rejection and flow rates making them particularly suitable for use in osmosis and ultrafiltration are provided by casting a solution of the polymer on a support, immersing the supported film in a coagulating bath and then recovering the film, in which:

Dialysis liquid monitoring and generating assembly

Abstract: Apparatus for generating and controlling the supply of dialysis liquid to a haemodialyzer comprises sources of dialysis liquid concentrate and water and a metering vessel for each, a mixing tank and a storage tank interconnected by flexible pipelines with valves and pinching devices. A heating vessel is between the storage tank and the haemodialyzer and a gas-bubble line runs from the top of the heating vessel direct to the pump by-passing the dialyzer. A part of the system including a temporary storage buffer tank may be formed into a smaller circuit for sterilization purposes.

Separating apparatus particularly suitable for gas permeation and in pervaporation

Abstract: Separating apparatus, particularly suitable for gas permeation and pervaporaton, such apparatus comprising a plurality of parallelopipedonal frame members having a central cell forming aperture stacked alternately with a plurality of parallelopipedonal membrane members of substantially the same outside dimensions, the membrane members each including two permeable membranes having a porous support interposed therebetween, at least one opening formed in the porous support near one side and extending across between 40 and 90% of the width of the support, with the two membranes secured to one another in a fluid tight manner over a zone within the opening or openings, at least one orifice being formed in the membranes in said zone or zones, the openings of alternate membrane members being on opposite sides of the stack; means for supplying fluid to one end of the stack; means for withdrawing fluid from the other end of the stack; a fluid tight chamber enclosing the stack and means for removing permeate from said chamber.

Catalyst based on raney nickel containing iron

Abstract: A hydrogenation catalyst, particularly useful for conversion of nitriles to amines, is obtained by treating with base a Raney alloy powder containing: 23 - 43% BY WEIGHT NICKEL 0.2 - 1.8% BY WEIGHT CHROMIUM 1.5 - 5% BY WEIGHT IRON THE REMAINDER BEING ALUMINIUM.

New cross-linked polyimides

Abstract: The invention provides novel cross-linked polyimides made by reacting a dianhydride with a molar excess of diamine, reacting the product with an unsaturated anhydride to produce an unsaturated polyamide, and heating the latter to produce the cross-linked polyimide.

Method for forced flow electrophoresis

Abstract: A CONTINUOUS FORCED FLOW ELECTROPHORESIS CELL AND A METHOD OF OPERATION FOR THE FRACTIONATION OF AN AQUEOUS LIQUID, SUCH AS BLOOD, CONTAINING AT LEAST TWO COMPOUNDS, THE RELATIVE MOBILITIES OF WHICH IS AN ELECTRIC FIELD VARY AS A FUNCTION OF THE PH, IN ORDER TO OBTAIN ONE FRACTION ENRICHED AND ONE DEPLETED IN ONE OF THE COMPOUNDS, THE CELL HAVING SIX COMPARTMENTS DIVIDED BY ION PERMEABLE MEMBRANES, THE END CELL CONTAINING AN ANODE AND CATHODE RESPECITIVELY, THE CENTRAL CELLS BEING SEPARATED BY A MICROPOROUS MEMBRANE. THE LIQUID IS FED TO ONE OF THE CENTRAL CELLS THE FILTERED FRACTION BEING REMOVED, AFTER PASSAGE THROUGH THE MICROPOROUS MEMBRANE, FROM THE OTHER. A MAIN ELECTROLYTE TO THE INTERMEDIATE CELLS AND AN AUXILIARY ELECTROLYTE TO THE INTERMEDIATE CELLS SUCH THAT THE PH IN ONE INTERMEDIATE CELL DIFFERS FROM THAT OF THE OTHER.

Epoxy resin compositions

Abstract: 1. A HEAT-CURABLE COMPOSITION OBTAINED BY REACTING AN EXPOXY RESIN CONTAINING AT LEAST TWO EXPOXY GROUPS PER MOLECULE WITH A PREPOLYMER POSSESSING IMIDE GROUPS OBTAINED BY HEATING, AT BETWEEN 50*C. AND 250*C., A BIS-IMIDE OF THE GENERAL FORMULA: (-CO-D-CO-)>N-A-N<(-CO-D-CO-) IN WHICH D REPRESENTS A DIVALENT ORGANIC RADICAL CONTAINING A CARBON-CARBON DOUBLE BOND AND A REPRESENTS A DIVALENT ORGANIV RADICAL POSSESSING 2 TO 30 CARBON ATOMS, WITH A POLYAMINE OF THE AVERAGE GENERAL FORMULA: H2N-PHENYLENE-R-(PHENYLENE(-NH2))X-R-PHENYLENE-NH2 IN WHICH X REPRESENTS A NUMBER FROM APPROXIMATELY 0.1 TO 2 AND R REPRESENTS A DIVALENT HYDROCARBON RADICAL WITH 1 TO 8 CARBON ATOMS, WHICH IS DERIVED FROM AN ALDEHYDE OR A KETONE OF THE GENERAL FORMULA: O=R IN WHICH THE OXYGEB ATOM IS BONDED TO A CARBON ATOM OF THE R RADICAL, THE NUMBER OF IMIDE GROUPS POVIDED BY THE BIS-IMIDE BEING FROM 1 TO 50 PER-NH2 GROUP PROVIDED BY THE POLYAMINE, SAID PREPOLYMER REPRESENTING FROM 5 TO 90% BY WEIGHT OF THE PREPOLYMER AND EPOXY RESIN.

Textile articles for protective clothing

Abstract: The present invention relates to noninflammable yarns and fibers having a base of polyamide-imide, with a high power of adsorption. More particularly, it relates to yarns and fibers containing 8 to 35% activated carbon (referred to the quantity of dry materials), an iodine number of 100 to 500, and a specific surface of 90-300 m2/g. The yarns in accordance with the invention are used, for example, in fabrics for protection against harmful gases, in the manufacture of cigarette filters, etc.

Pressure modulator for an artificial blood circuit

Abstract: A pressure modulator for an artificial blood circuit, including at least one readily deformable wall forming a blood chamber having inlet and outlet ducts and a pair of substantially rigid plates arranged one on either side of said blood chamber, pulsation chambers disposed on the sides of said rigid plates remote from the blood chamber and a fluid pulse generator connected to the pulsation chambers, the rigid plates forming part of a rigid plate exchanger such as a haemodialyser, an artificial lung or a heat exchanger, the pulses inducing slight flexing of the plates and thus pulsing of the liquid in the blood chamber.

Process for the preparation of allylic alcohols

Abstract: Allylic primary and secondary alcohols are prepared by rearranging allylic tertiary alcohols in the presence of a catalyst comprising a metal of group Va, VIa or VIIa of the Periodic Table of Mendeleev.

Process for the preparation of thermosetting polymers from n,n-bis-maleimide

Abstract: The present invention relates to a continuous process for the preparation of thermosetting polymers possessing imide groups, by heating an N,N''-bis-maleimide and bis-(4-amino-phenyl)-methane at a temperature between 95* and 250*C., in which the bis-maleimide, as a particulate solid, and the diamine, in the molten state, are introduced separately into a kneader equipped with an extrusion screw.

Heat-resistant polymers based on polyamines and oligomers possessing imide groups

Abstract: IN WHICH X REPRESENTS A NUMBER FROM 0.1 TO ABOUT 2, R represents a divalent hydrocarbon radical with 1 to 8 carbon atoms, which is derived from an aldehyde or a ketone of the general formula: A heat resistant or heat-curable polymer composition obtained by reacting, between 50*C. and 350*C., (a) an oligomer having the average general formula:

Ruthenium complexes and processes for their preparation

Abstract: THE INVENTION PROVIDES NEW RUTHENIUM COMPLEXES OF THE FORMULA RU(DIKET)2LN IN WHICH (DIKET REPRESENTS A BIDENTATE LIGAND DERIVED FROM A B- DIKETONE AND HAS THE GENERAL FORMULA: R1-CO-C(-R2)=C(-R3)-O(-) IN WHICH R1, R2 AND R3 ARE EACH ALKYL OR 1 TO 3 CARBON ABOMS, PHENYL RO NAPHTHYL, OR R2 IS HYDROGEN, OR R1 AND R2 TOGETHER FORM A TRI- OR TETRA-METHYLELE CHAIN WHICH IS UNSUBSTITUTED OR SUBSTITUTED BY ALKYL OF 1 TO 3 CARBON ATOMS, OR R1 AND R3 TOGETHER FORM A DI- OR TRI-NETHYLENE CHAIN WHICH IS UNSUBSTITUTED OR SUBSTITUTED BY AN ALKYL GROUP OF 1 TO 3 CARBON ATOMS AND L IS A NITRILE LIGAND, WHICH ARE USEFUL AS CATALYSTS IN, FOR EXAMPLE ISOMERIZATIONS (SUCH AS THE REPPE SYNTHESIS), HYDROGENATIONS, AND DIMERIZATIONS (SUCH AS HYDRODIMERIZATION OF ACRYLONITRILE TO ADIPONITRILE).

Yarn bundle with piecing end and method of forming same

Abstract: A yarn bundle wound on a support including a piecing end having an initial piecing winding wound around an end portion of the support and a principal piecing winding wound over the initial piecing winding with a reverse pitch relative thereto such that the initial piecing winding is captured by the principal piecing winding, and a method of forming a yarn bundle with a piecing end as described above including moving a yarn guide toward an end of a support, catching yarn to be wound on the support near the end of the support to deliver the yarn to a rotating element to form the initial piecing winding, and moving the yarn guide away from the end of the support to form the principal piecing winding over the initial piecing winding.

Implantable dental support

Abstract: An implantable support for a dental prosthesis having an implantable body portion, e.g., a stainless steel pin, surrounded by a resilient envelope, e.g., formed of organosilicic elastomer. The outer surface of the envelope is colonizable by the surrounding living tissue e.g., by providing it with a textile sleeve which is colonizable by the tissue of the patient''s gum.

Fluid separation apparatus and membrane support frames therefor

Abstract: Fluid separating apparatus and a support frame for placing between the membranes thereof, in which the frame comprises a generally rectangular plate, having two faces and two ends, at least one cell forming recess formed in each face, at least one orifice extending through the thickness of the plate adjacent the ends of the plate for the passage of fluid to be treated, a duct for the removal of fluid, which is passed through the membrane supported by the plate over each of said cells forming recesses, an aperture passing through the plate and positioned between at least one of the orifices and the cell forming recess, said aperture having a rules surface along the edge thereof adjacent said cell forming recess, and a detachable clamp located wholly within said aperture to clamp membranes disposed on each of said faces in a fluid-tight manner against said rules surface of said plate.

3-(2,4-dichloro-5-propargyloxy-phenyl) oxadiazolone derivatives useful as herbicides

Abstract: An oxadiazolone derivative of the formula: WHEREIN R is alkyl of one through four carbon atoms or alkenyl of two through four carbon atoms, R1 is alkynyloxy of three or four carbon atoms, R2 is halogen or alkynyloxy of three or four carbon atoms, and n is zero or an integer from 1 through 4, possess herbicidal properties and are especially useful for combatting grasses.

Apparatus for the transport of yarns

Abstract: Apparatus for the high speed transport of yarns using a fluid comprising a first guide passage, a second guide passage, the outlet of the first guide passage communicating with the inlet of the second guide passage, and a longitudinal slot in the second guide passage extending upstream from the outlet of the second guide passage along the length of the second guide passage.

Light non-inflammable laminates

Abstract: Non-inflammable laminates which on combustion give only small and non-toxic amounts of fumes and gases have a thin metal foil facing on an asbestos paper support and a core of glass fibre fabric, polyamide-imide fibre fabric, or polyimide fibre fabric, optionally with an asbestos fabric, the whole being bonded together with an organosilicon polymer or polyimide.

Process for the preparation of cyclopeptides derived from polymyxins

Abstract: D R A W I N G WHEREIN A is alkyl of three through 18 carbon atoms optionally substituted by hydroxy, amino or cyano; or alkyl of one through four carbon atoms substituted by a monocyclic or polycyclic alkyl radical or phenyl optionally substituted by halogen or alkoxy; or phenyl optionally substituted by halogen or alkoxy, X is -CO- or -SO2-, and Y-Z is one of the chains D-Phe-Leu, D-Leu-Leu and DLeu-Ileu, are prepared by introducing the grouping A-X-Dab-ThrDab- onto the appropriate cyclopeptide having its amino functions protected. New polymyxins of the said formula have antibiotic properties. Polymyxins of the formula

Imide copolymers possessing hydroxyl groups

Abstract: Imide copolymers consisting essentially of at least ##SPC1##of recurring units of the formula ##SPC2## Together with recurring units of the formula: In which M represents an aliphatic, aromatic, carbocyclic or heterocyclic divalent radical and R represents a tetravalent aromatic radical are provided having special utility as adhesives for polyimide and polyimide-amide films.

Method of forming high elongation polymide-imide films

Abstract: Polyamide imide films having a high elongation at break, and suitable for insulating electrical conductors which are to be subjected to stress, are made from polyamideimides comprising structural units of formula:

Catalysts for selective hydrogenation of hydrocarbons

Abstract: THE REMOVAL OF UNSATURATED IMPURITIES IN THE PURIFICATION OF ETHYLENIC GASES BY SELECTIVE HYDROGENATION WITH A CATALYST OF PALLADIUM HAVING AN ADDITION OF VANADIUM AS A PROMOTER.

Complex forming polymers

Abstract: COMPLEX FORMING POLYMERS HAVING REPEAT UNITS 2-(PYRID-2-YL-L-)PYRIDINE JOINED TO EACH OTHER BY POLYVALENT LINKING GROUPS, WHERE L IS A DIRECT BOND OR AN O, S, CO, CHR1 OR NR1 LINK (R1 BEING HYDROGEN OR ALKYL) AND THE PYRIDYL RINGS MAY BE SUBSTITUTED BY ALKYL OR LINKED TO EACH OTHER AT POSITIONS ORTHO TO THE L LINK BY A -CR1=CR1 GROUP, ARE USEFUL FOR COMPLEXING NON-ALKALINE METAL ATOMS. THEY WILL FORM COMPLEXES IN AN ACIDIC MEDIUM AND WHEN THE METAL IS ITSELF ALREADY PART OF A COMPLEX ION. THE COMPLEXED POLYMERS ARE USEFUL AS CATALYSTS AND, AS ARE THE COMPLEX FORMING POLYMERS, AS VARNISHES FOR COATING METAL. THE POLYMERS ARE PREPARED BY A VARIETY OF VINYL-TYPE POLYMERIZATIONS AND POLYCONDENSATIONS. PARTICULARLY USEFUL INTERMEDIATES 2-(4-(H-CO-AR-CH=CH-)PYRID-2-YL),4-(H-CO-AR-CH=CH-)PYRIDINE WHERE AR IS ARYL ARE PREPARED FROM THE ARYL DIALDEHYDE AND 4,4''-DIMETHYL-2,2''-DIPRIDYL.