US3909196A - Process and device for the impregnation and drying of textile material - Google Patents

Process and device for the impregnation and drying of textile material Download PDF

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Publication number
US3909196A
US3909196A US302853A US30285372A US3909196A US 3909196 A US3909196 A US 3909196A US 302853 A US302853 A US 302853A US 30285372 A US30285372 A US 30285372A US 3909196 A US3909196 A US 3909196A
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United States
Prior art keywords
textile
burning
textile material
organic liquid
inflammable
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Expired - Lifetime
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US302853A
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English (en)
Inventor
Walter Birke
Der Eltz Hans-Ulrich Von
Franz Schon
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
BRUCKNER TROCKENTECHNIK & Co KG 8-10 BENZSTRASSE D-7250 LEONBERG GERMANY GmbH
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Hoechst AG
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Priority claimed from DE2214714A external-priority patent/DE2214714C3/de
Priority claimed from DE19722246781 external-priority patent/DE2246781C3/de
Priority claimed from DE19722246889 external-priority patent/DE2246889C3/de
Priority claimed from DE19722246760 external-priority patent/DE2246760C3/de
Application filed by Hoechst AG filed Critical Hoechst AG
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Publication of US3909196A publication Critical patent/US3909196A/en
Assigned to BRUCKNER TROCKENTECHNIK GMBH & CO., KG. 8-10 BENZSTRASSE D-7250 LEONBERG, GERMANY reassignment BRUCKNER TROCKENTECHNIK GMBH & CO., KG. 8-10 BENZSTRASSE D-7250 LEONBERG, GERMANY ASSIGNMENT OF ASSIGNORS INTEREST. Assignors: HOECHST AKTIENGESELLSCHAFT,
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    • D—TEXTILES; PAPER
    • D06—TREATMENT OF TEXTILES OR THE LIKE; LAUNDERING; FLEXIBLE MATERIALS NOT OTHERWISE PROVIDED FOR
    • D06C—FINISHING, DRESSING, TENTERING OR STRETCHING TEXTILE FABRICS
    • D06C7/00—Heating or cooling textile fabrics
    • D—TEXTILES; PAPER
    • D06—TREATMENT OF TEXTILES OR THE LIKE; LAUNDERING; FLEXIBLE MATERIALS NOT OTHERWISE PROVIDED FOR
    • D06C—FINISHING, DRESSING, TENTERING OR STRETCHING TEXTILE FABRICS
    • D06C2700/00—Finishing or decoration of textile materials, except for bleaching, dyeing, printing, mercerising, washing or fulling
    • D06C2700/09—Various apparatus for drying textiles

Definitions

  • Textile materials of the most various kinds of fibers can be impregnated from water or organic solvents according to known methods.
  • the textiles are nip-padded, padded or sprayed with a solution or dispersion of the substance to be applied onto thefabric.
  • the material is generally driedand, depending on the substance applied, further treated. In all these processes, it is necessary to remove the liquid remaining on the textiles from the impregnation bath during drying by the supply of energy.
  • the present invention relates to a process for the impregnation and subsequent drying of textile material, wherein the material is treated with an impregnating bath containing an inflammable organic liquid and wherein the material is dried by burning off this liquid.
  • inflammable organic liquids there may be used in the process of the invention all inflammable watersoluble or water-miscible and, in connection with emulsifiers, water-insoluble liquids; however, for safety reasons, those liquids are not suitable which have too low ignition points, have too strong an evolution of heat during burning off and have too low evaporation values.
  • Particularly suitable are lower aliphatic alcohols, preferably those containing 1 to 3 carbon atoms, especially methanol, furthermore cyclic ethers, in particular dioxane.
  • the mentioned solvents are used alone or in admixture with water.
  • impregnating baths which contain high proportions of water.
  • impregnating baths which contain to 90 by volume of alcohol and 90 to l0 by volume of water, preferably 30 to 80 by volume of methanol.
  • the addition of water permits control of the speed of the burning off process. In this manner,an optimal mixture can be determined for each fibrous material which prevents inflammation of the fibrous material during the burning off process.
  • the process of the invention is carried ,out by padding, spraying or nip-padding the material in the usual manner with an impregnating bath which contains, in addition to the substances to be applied onto the fabric, different amounts of one or more inflammableorganic liquids
  • the impregnating bath may furthermorecontain chemicals and auxiliary agents such as dispersing agents, emulsifiers, dyestuff solvents, wetting agents, thickening agents, fiber swelling agents, dyeing accelerators, and so on.
  • the quantity of inflammable organic liquid added can varywithin widelimits'and depends on the textile material to be treated and on'the nature of the substance to be applied onto the fiber.
  • the 'temperature used during the treatment of the textile material with the impregnating bath has practi point of the liquid used.
  • temperatures of the materialof about 1 to 40 C, preferably 1 to 15 C, below the respective ignition point of the impregnating bath are sufficient.
  • the material After impregnation and/or dwelling, the material is dried in such a manner that the inflammable organic solvent is ignited by a suitable ignition device and burned off completely. For safety reasons, it is advisable to use such mixturesof water and inflammable organic solvents whose ignition points are above room,
  • the burning off of the liquid on the material can also be effected on one side by the supply of additional heat, which according to the inven-.
  • tion can be realized preferably during passage of the material around a rotating drum.
  • the impregnating bath which is already on the ma terial is heated, for example by infrared heating devices to temperatures above the ignition pointof the respective solvent used, a single ignition is in general suffi cient.
  • the ignition is suitably effected in direct vicinity of the heating device.
  • this heating of the material may be effected, for example by an oil-heated drum, by infrared irradiation, orby gas jets, or in the ease ofa perforated drum, by hot air.
  • Ad ditional heating devices along the burn-off area are furth'ermore of advantage, if the operation is carried out with impregnating baths which contain a high proportion of water. It is thereby possible to adjust, the steam to temperatures at which it may be used directly or indirectly for any fixing processes following the drying.
  • the dried material is then further treated.
  • the dyestuff in a dyeing process, the dyestuffis fixed in the usual man ner, either by contact heat, by a hot air treatment, by
  • I may be used for the hardening of the precondensates 6 applied .onto the fabrics.
  • the process of the invention is suitable for such impregnating processes in which one or several substances are applied onto the fabric.
  • substances are, for example the dyestuffs, sizing agents, optical brightcners, finishing agents and other substances usually employed in the textile industry.
  • dyestuffs practically all dyestuffs of any class and any form of application may be used in the process of the invention, independently on whether the dyestuffs are soluble or not in the inflammable liquid used. If dyestuff solutions are used, the dyestuffs employed need not be prepared in the commercial form, but can He used without previous finish treatment of the dyestuff.
  • the process can by applied practically to all kinds of fibers of native or synthetic origin, as well as to all fiber mixtures.
  • the textile materials may be present in processing states suitable for a continuous method of operation, for example as cables, worsted, filaments, yarns, fabrics, knitted fabrics or non-woven fabrics.
  • the burning off produces a more or less strong singeing effect which is dependent on the inflammable solvent and on the water content of the treating baths and which in many cases makes unnecessary a usual singeing treatment.
  • the advantage of the process of the invention resides in the fact that the textile material can be dried, after the impregnating processes, in simple manner and optionally without additional energy, whereby the products are distributed essentially more uniformly on the textile material than according to the conventional processes. This applies especially to strongly migrating dyestuffs which yield considerably more level dyeings when treated according to the process of the invention. It was surprising that the fibers are not damaged by this treatment and that the textile-technological character, for example the handle is fully maintained.
  • a further advantage of the process of the invention is that, if methanol is used, no substances are formed by the burning off which would contaminate the air or the water. Moreover, the use of methanol/water mixtures offers the advantage that the speed of the burning off can be controlled in easy manner by modification of the mixing proportion and, on the other hand, that in this manner the natural moisture of the fiber can be better regulated.
  • a drying equipment which is suitable for realizing the process of the invention is shown, by way of example, in the annexed drawings.
  • a drying device comprises a burning off chamber (1) with inlet and outlet and transporting means for the material during passage through the device, an igniting element (2) and and means for the supply of air (3) and for the discharge of the exhaust gases and of the steam (4), as shown in the sche matical drawing FIG. I.
  • the material (5) may enter into the burning off chamber either from the top of from below.
  • certain safety means must be provided.
  • the ignition device must be so constructed as to ensure continuous ignition of the solvent entering anew with the goods the burn-off chamber. If the goods are passed in the inversed sense, the ignition device shall ignite the solvent vapors only once. The burning off then proceeds automatically, since the goods are running into the rising flame. In order to obtain uniform drying of the web of the fabric, one ignition device each on each side of the web of the fabric or on both edges must be present. As igniting devices. for example gas flames or electric ignition elements may be used.
  • the burning off chamber is suitably sealed. for reasons of safety. by a pair of rolls (6).
  • an inlet or outlet slot (7) is in general sufficient.
  • the metal rolls as well as the inlet or discharge slot may be provided with sliding bands (8) or other non-inflammable sealings.
  • the height of the chamber depends on the speed of passage of the goods and on the nature and quantity of the inflammable liquid used. In practice, the burning off chamber will have a height of from 0.5 to 10 m, preferably l to 5 m.
  • the burning off chamber may also be constructed in a totally or partly open form, in which the lateral walls are completely or partially omitted.
  • the top part of the chamber is provided with discharge openings (4) for the hot exhaust gases which can be passed directly into a fixing chamber arranged beside the burning off chamber.
  • the air required for the burning off is supplied from outside through corresponding tubes (3).
  • a ventilating device (9) can be arranged before the burning off chamber which removes by aspiration any solvent vapors which are released from the moist material before it enters the chamber.
  • Another safety device or a device for stopping the machine consists of nozzles (10) which are directed, in the case of an open or semi-open construction, to the burning off area and, which, in the case of a closed construction, are placed within the burning off chamber or before the inlet aperture and optionally before the outlet aperture and through which nitrogen or another non inflammable gas can be passed. If these nozzles are opened, the supply of oxygen or air should simultaneously be stopped.
  • the goods can also be passed from the top downwards.
  • the igniting device (2), the means for the supply of air (3) and the suction device (9) have to arranged at the upper part of the burn-off chamber.
  • the elements required for transporting the fabric are suitably protected against too strong heating by a heat shield (11). Furthermore, they are adjustable in height, whereby the drying distance can be varied in length.
  • heating devices (12) which heat up the inflammable liquid on the fabric to above its ignition point and, on the other hand, promotes the evaporation of the inflammable liquid or of the water. In addition thereto, they support the heating up of the exhaust gases and'of the steam so that these can be used directly or indirectly for fixing processes.
  • control devices (14) for the drying the regulation of the speed of the fabric in dependence on the burning-off distance and for the function of the safety devices.
  • the control of the flame is effected, for example by lateral air nozzles (13) which are likewise arranged at both sides of the burning off area and can be turned to either side.
  • Another safety device consists in cooling elements for the goods to be treated and the impregnating liquor, which are arranged before the inlet of the goods into the chamber.
  • Such elements may comprise, for example a cooling trough with foulard rollers and a cooling drum.
  • FIG. ll The combination of the equipment of the invention with known finishing machines is illustrated in the annexed schematic drawings.
  • the reference numbers used in these drawings have the following meanings: FIG. ll
  • FIG. IV shows a modification of above-described types of the device of the invention, using as transporting means for the goods a perforated rotating drum, and in which the burning off of the inflammable portions of the impregnating bath is effected from one side.
  • the reference numbers used in FIG. IV have the following meanings: FIG. IV:
  • Burn-off chamber 2 Ignition device 3 Supply of air 4 Discharge of the exhaust gases and of the steam 5 Web of fabric 27 Fabric guide rollers 7 Inlet slot 28 Drying drum 9 Ventilation device 10 Safety nozzles 12 Heating devices 29 Discharge slot According to the invention, the drying drum in FIG.
  • IV may be a closedor perforated drum.
  • a closed drum hot water, steam or oil which are circulated in the drum may serve for heating up the impregnating liquor on the goods to a temperature above the ignition point. If a perforated drum is used, hot air is blown from one side through the textile material, which has the same effect. The diameter of this drum depends on the drying speed of the textile material.
  • the burning off process can be controlled by photo cells, thermosensors or other control devices; thus, such control devices which are placed below or above the ignition device can trigger, for example in the case of a flame running backwards, the above-described safety devices and/or optionally regulate the speed of the machine and influence the ignition device.
  • the dyeing was then further treated according to a method usual for this class of dyestuffs (cold overpadding with a bath, which contained 20 g/l of concentrated sodium sulfide, 10 ml/] of 33% formaldehyde and 200 g/l of sodium chloride, air passage for 30seconds, rinsing cold and hot, hot soaping for 10 minutes with 0,3 g/l of a non-ionogenic detergent on the basis of an alkyIphenol-polyglycol ether and 0.5 g/l of soda, rinsing and drying).
  • EXAMPLE 3 2 g of the dyestuff of the formula were dissolved in 1 liter of methanol. With this bath, a fabric of polyester fibers was padded on a foulard at about C and dried by burning off the alcohol in a suitable apparatus.
  • EXAMPLE 4 g of a mixture of commercial dyestuffs of the following formulae and in the indicated mixing proportion were dispersed in 1 liter of a mixture of by volume of methanol and 40 by volume of water at about 30 C.
  • a cotton fabric (linnen structure) was padded on a foulard with this bath and dried in a suitable apparatus by burning off the inflammable liquid on the fabric.
  • a khaki coloured fabric was obtained which, with regard to levelness and depth of colour, exhibited a very good outer appearancewhich was also maintained after the further treatment of the dyeing according to one of the usual methods (for example, over-padding with an alkali, reduction agent and electrolyte containing bath, subsequent steaming, oxydation, etc.).
  • the blue dyeings dried by burning off showed a completely uniform appearance, whereas the ,two other dyeings produced from perchloroethylene and methylene chloride showed strong dyestuff migration and a strong double-sidedness.
  • the dyeings were subsequently further treated according to one of the usual methods (for example, thermofixation).
  • EXAMPLE 6 2 g each of the blue dyestuff of the formula were dissolved in each time 1 liter of the following liquids: methanol, isopropanol, a mixture of 90 by volume of methanol and 10% by volume of water, a mixture of 60 by volume of methanol and 40 by volume of isopropanol, perchloroethylene and methylene chloride.
  • EXAMPLE 7 5 g of the dyestuff CI. 62125 (Acid Blue 40) were dissolved in 1 liter of a mixture of 80% by volume of methanol and 20 by volume of water at about 40 C. After cooling to room temperature, a fabric of polyamide 6,6 staple fibers was impregnated with this solution on a foulard and subsequently dried on a suitable apparatus by burning off the inflammable liquide that remained on the goods. An ongoing uniform blue dyeing was obtained which was then further treated ac cording to a usual method (for example, by steaming).
  • a mixed fabric of 67 of polyester fibers and 33 of cotton was padded with this bath on a foulard and dried, as described in the foregoing Examples, by burning off. A fabric was obtained which showed a completely uniform appearance.
  • the further treatment of the yellow dyeing on both fiber components was effected by a hot air treatment at about 190 C for 1 minute.
  • the dyed fabric was then rinsed cold and hot with water, then soaped hot for 10 minutes with an aqueous bath which contained, per li- 'ter, 1 g of a conventional soaping agent on the basis of a fatty acid methyl tauride, and finally rinsed at first with water and subsequently with methanol.
  • the methanolwet fabric was squeezed on a foulard with a squeezing effect of 40 (parts by weight, referred to the weight of the fabric) and directly thereafter sprayed to a layer of 30 (likewise parts by weight, referred to the weight of the goods) with a liquor which contained g of a finishing agent in the form of a commercial polyvinyl acetate dispersion containing a softener, per liter of a mixture of 80 by volume of water and 20 by volume of methanol.
  • the fabric was then dried, as in the preceding dyestuff drying, in a suitable apparatus by burning off the inflammable solvents on the goods.
  • the final treatment was carried out by calandering at about 60 C.
  • EXAMPLE 9 A fabric of polyester staple fibers was padded on a foulard with a bath which contained, per liter of a mixture of 65 of 65% by volume of methanol and 35% by volume of water, 25 g of an optical brightener on the basis of benzoxazole present in the commercial form of an aqueous dispersion.
  • the padded fabric was dried, as described in the preceding Examples, by burning off.
  • the further treatment was effected by a conventional heat fixation at 200 C for 30 seconds.
  • EXAMPLE 10 A dyed mixed fabric of 67% of polyester fibers and 33 of cotton was padded on a foulard with a bath which contained, per liter of a mixture of 60 by volume of methanol and 40 by volume of water, 80 g of a finishing agent on the basis of a commercial polyvinyl acetate dispersion containing a softener. The fabric was then dried in a suitable apparatus by burning off the inflammable liquid remaining of the fabric and subsequently calandered. A finished fabric which was fast to washing was obtained.
  • EXAMPLE 1 l A water or alcohol soluble finishing agent on the basis of a copolymer was applied (a) from water according to the conventional method, (b) from methanol according to the method described in Example 10, onto a staple fiber lining. There were obtained similar results according to both methods with regard to influence on the handle and improvement of the non-slip properties.
  • EXAMPLE 12 g of a commercial high quality finishing agent on the basis of a carbamate reactant resin were dissolved together with 25 g of crystallized magnesium chloride in a mixture of 70 by volume of methanol and 30 by volume of water. Unbleached cotton poplin was padded with this bath on a foulard and driedby burning off as described above. The final treatment was carried out by the usual condensation at about 160 C for 3 minutes. A poplin with an excellent wash-and-wear finish and a soft handle was obtained.
  • EXAMPLE 14 20 g of the dyestuff Vat Orange 7 (CI. 71 105) were dispersed in 600 ml of water and made up with dioxane (diethylene dioxde) to a volume of 1 liter. A cotton twill was padded on a foulard with this bath and dried in a suitable apparatus by burning off the inflammable liquid remaining on the fabric. A brilliant orange dyeing showing a completely uniform appearance with regard to levelness and depth of shade was obtained, which was also preserved after the fixation of the dyestuff according to one of the methods used for vat dyestuffs.
  • dioxane diethylene dioxde
  • EXAMPLE 1 4 g of the dyestuff Acid Blue 40 (CI. No. 62 125) were dissolved in 1 liter of a mixture of 80 by volume of methanol and by volume of water. A fabric of polyamide-6,6 staple fibers was padded on a foulard at about 18 C and dried in a suitable apparatus by burning off the alcohol. The dyestuff was subsequently fixed on the polyamide fabric by a hot air treatment for 1 minute at about 200 C. This was carried out in a chamber directly connected to the burning off chamber and which was heated indirectly by the heat set free by the burning off.
  • the dyed fabric was further treated at first in the usual manner by rinsing, soaping with an aqueous bath of 0.5 g/l of a non-ionogenic detergent at about 40 C and rinsing with water. After the last rinsing, the fabric was squeezed, rinsed with methanol, squeezed again and dried, as after the impregnation with dyestuff, by
  • a process for the impregnation of a textile material with a textile treating agent and subsequent drying of the textile material comprising treating the textile material with an impregnating bath, said bath consisting.
  • the impregnating bath comprises a monohydric hydrocarbon alcohol having 1 to 3 carbon atoms.
  • a process for treating textile material which consists essentially of applying to the textile material a textile treating agent and an inflammable organic liquid and subsequently drying the textile material by burning off the organic liquid.
  • treating agent is selected from the group consisting of dyestuffs.
  • a process for dyeing a textile material whichconsists essentially of applying dyestuffs to the textile material and applying an inflammable organic liquid to the material and subsequently drying the textile material by burning off the organic liquid.

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  • Engineering & Computer Science (AREA)
  • Textile Engineering (AREA)
  • Treatment Of Fiber Materials (AREA)
  • Extraction Or Liquid Replacement (AREA)
  • Coloring (AREA)
  • Treatments For Attaching Organic Compounds To Fibrous Goods (AREA)
US302853A 1972-03-25 1972-11-01 Process and device for the impregnation and drying of textile material Expired - Lifetime US3909196A (en)

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
DE2214714A DE2214714C3 (de) 1972-03-25 1972-03-25 Verfahren und Vorrichtung zum Imprägnieren und Trocknen von Textilmaterial
DE19722246781 DE2246781C3 (de) 1972-03-25 1972-09-23 Verfahren und Vorrichtung zum Imprägnieren und Trocknen von Textilmaterial
DE19722246889 DE2246889C3 (de) 1972-03-25 1972-09-23 Verfahren und Vorrichtung zum Imprägnieren und Trocknen von Textilmaterial
DE19722246760 DE2246760C3 (de) 1972-03-25 1972-09-23 Verfahren und Vorrichtung zum Imprägnieren und Trocknen von Textilmaterial

Related Child Applications (1)

Application Number Title Priority Date Filing Date
US05/517,765 Division US3984198A (en) 1972-02-23 1974-10-24 Device for the impregnation and drying of textile material

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US3909196A true US3909196A (en) 1975-09-30

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US302853A Expired - Lifetime US3909196A (en) 1972-03-25 1972-11-01 Process and device for the impregnation and drying of textile material

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US (1) US3909196A (cs)
JP (1) JPS5230634B2 (cs)
AR (1) AR221809A1 (cs)
AT (1) AT370792B (cs)
AU (1) AU463837B2 (cs)
BE (1) BE794793A (cs)
CA (1) CA1021110A (cs)
CH (2) CH133373A4 (cs)
CS (1) CS167369B2 (cs)
DD (1) DD102181A5 (cs)
FR (1) FR2177731B1 (cs)
GB (1) GB1426444A (cs)
IT (1) IT978685B (cs)
NL (1) NL157673B (cs)
SE (1) SE383175B (cs)
SU (1) SU637092A3 (cs)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3991058A (en) * 1972-06-21 1976-11-09 Hoechst Aktiengesellschaft Process for drying chemical products using a burnable organic liquid such as methanol
US3993434A (en) * 1972-10-14 1976-11-23 Hoechst Aktiengesellschaft Process and device for the fixation of prints with reactive dyestuffs
US4378207A (en) * 1979-11-16 1983-03-29 Smith Thomas M Infra-red treatment
US4443185A (en) * 1979-03-13 1984-04-17 Smith Thomas M Heating of webs
US5571559A (en) * 1994-12-05 1996-11-05 Belding Heminway Co., Inc. Method and apparatus for bonding, coating and dyeing yarn

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3330055A1 (de) * 1983-08-19 1985-02-28 Brückner Trockentechnik GmbH & Co KG, 7250 Leonberg Verfahren und vorrichtung zum faerben und/oder ausruesten, trocknen und fixieren einer textilen warenbahn
RU2743438C1 (ru) * 2020-08-03 2021-02-18 Федеральное государственное бюджетное образовательное учреждение высшего образования "Воронежский государственный лесотехнический университет имени Г.Ф. Морозова" Способ крашения хлопчатобумажных материалов

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2437397A (en) * 1944-09-13 1948-03-09 Delinted Seed Company Delinting cotton seed

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2437397A (en) * 1944-09-13 1948-03-09 Delinted Seed Company Delinting cotton seed

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3991058A (en) * 1972-06-21 1976-11-09 Hoechst Aktiengesellschaft Process for drying chemical products using a burnable organic liquid such as methanol
US3993434A (en) * 1972-10-14 1976-11-23 Hoechst Aktiengesellschaft Process and device for the fixation of prints with reactive dyestuffs
US4443185A (en) * 1979-03-13 1984-04-17 Smith Thomas M Heating of webs
US4378207A (en) * 1979-11-16 1983-03-29 Smith Thomas M Infra-red treatment
US5571559A (en) * 1994-12-05 1996-11-05 Belding Heminway Co., Inc. Method and apparatus for bonding, coating and dyeing yarn

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Publication number Publication date
BE794793A (fr) 1973-07-31
AU5160573A (en) 1974-08-01
SU637092A3 (ru) 1978-12-05
JPS4913478A (cs) 1974-02-05
CA1021110A (en) 1977-11-22
CH556519B (de)
SE383175B (sv) 1976-03-01
FR2177731B1 (cs) 1976-05-14
CH133373A4 (cs) 1974-06-14
CH556519A (de) 1974-11-29
CS167369B2 (cs) 1976-04-29
AU463837B2 (en) 1975-08-07
NL157673B (nl) 1978-08-15
GB1426444A (en) 1976-02-25
DD102181A5 (cs) 1973-12-05
AT370792B (de) 1983-05-10
JPS5230634B2 (cs) 1977-08-09
NL7301381A (cs) 1973-09-27
AR221809A1 (es) 1981-03-31
ATA82073A (de) 1982-09-15
FR2177731A1 (cs) 1973-11-09
IT978685B (it) 1974-09-20

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AS Assignment

Owner name: BRUCKNER TROCKENTECHNIK GMBH & CO., KG. 8-10 BENZS

Free format text: ASSIGNMENT OF ASSIGNORS INTEREST.;ASSIGNOR:HOECHST AKTIENGESELLSCHAFT,;REEL/FRAME:004173/0177

Effective date: 19830830