US2975023A - Production of regenerated cellulose filaments - Google Patents
Production of regenerated cellulose filaments Download PDFInfo
- Publication number
- US2975023A US2975023A US743720A US74372058A US2975023A US 2975023 A US2975023 A US 2975023A US 743720 A US743720 A US 743720A US 74372058 A US74372058 A US 74372058A US 2975023 A US2975023 A US 2975023A
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- US
- United States
- Prior art keywords
- percent
- viscose
- cellulose
- weight
- filaments
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Lifetime
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Classifications
-
- D—TEXTILES; PAPER
- D01—NATURAL OR MAN-MADE THREADS OR FIBRES; SPINNING
- D01F—CHEMICAL FEATURES IN THE MANUFACTURE OF ARTIFICIAL FILAMENTS, THREADS, FIBRES, BRISTLES OR RIBBONS; APPARATUS SPECIALLY ADAPTED FOR THE MANUFACTURE OF CARBON FILAMENTS
- D01F2/00—Monocomponent artificial filaments or the like of cellulose or cellulose derivatives; Manufacture thereof
- D01F2/06—Monocomponent artificial filaments or the like of cellulose or cellulose derivatives; Manufacture thereof from viscose
- D01F2/08—Composition of the spinning solution or the bath
- D01F2/10—Addition to the spinning solution or spinning bath of substances which exert their effect equally well in either
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10S—TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10S264/00—Plastic and nonmetallic article shaping or treating: processes
- Y10S264/27—Process of spinning viscose where viscose has high degree of polymerization
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- Y10T428/00—Stock material or miscellaneous articles
- Y10T428/29—Coated or structually defined flake, particle, cell, strand, strand portion, rod, filament, macroscopic fiber or mass thereof
- Y10T428/2913—Rod, strand, filament or fiber
Definitions
- the tenacity of regenerated cellulose fibres can be increased by subjecting them immediately after spinning to stretching in a hot dilute acid bath, as described in US, patent specification No. 2,192,074.
- the addition to the viscose of polyethylene oxide or certain polyethylene oxide condensation products enables filaments to be produced having a thick skin and non-crenulated surface with a bean shaped cross-section and a diffuse boundary between the skin and core.
- Such filaments have a high wet tenacity and are capable of forming a cord of good tensile properties.
- the skin and core can be shown, and the skin and core differentiated by a staining technique as described for example in the Textile Research Journal 1945, page 443.
- Viscose is normally spun at 20 C., although proposals have been made to spin at higher temperatures, but very little advantage is gained in spinning normal viscose under these conditions.
- the drawofi speed of the filaments may be increased substantially, but to an extent limited by the ball-fall viscosity of the viscose at the extrusion temperature if advantage is to be taken of the effect of the high D.P in increasing the tenacity of the filaments.
- draw-ofi speed should not substantially exceed the value defined by the curve shown inthe accompanying drawing, the ball fall viscosity being defined as the time taken for a steel ball of one eighth of an inch diameter to fall through 20 centimetres of viscose at the extrusion temperature, draw-oil speed is defined as the speed at which coagulated filaments are drawn through the spinning bath away from the spinnerette.
- regenerated cellulose filaments having a substantially circular or bean-shaped cross-section and a substantially all-skin structure are produced by extruding viscose, the cellulose of which has an average degree of polymerization of at least 400,'at a temperature of between 40 C. and 60 C.
- the total saltcontent preferably not exceeding 24 percent by weight, in the presence of between 0.5 and 10 percent by weight of the Weight of the cellulose of a polyethylene oxide of average molecular weight between 300 and 10,000, preferably between 600 and 6,000, at a draw off speed not substantially greater than that defined by the curve shown in the accompanying drawing, the ball fall viscosity being defined as the number of seconds taken by a steel ball one eighth of an inch in diameter to fall through 20 centimetres of viscose at the extrusion temperature.
- the viscosities used in the present process range from about 40 to about 400 seconds.
- the filaments should be subjected to hot-stretching, in accordance with US. patent specification No. 2,192,074 in a hot aqueous acid bath preferably containing at least 3 percent of sulphuric acid. Regeneration of the filaments should be substantially complete when the filaments leave this bath.
- the salt point is defined in its normal sense, as the percentage strength of an aqueous sodium chloride solution required just to coagulate the viscose at 15 C.
- the extrusion ratio is the ratio of the speed at which the filaments are drawn from the jet to the speed at which the viscose passes through the jet orifices.
- the polyethylene oxide is preferably added to the viscose and may be added in the form of a condensation product as described in the specification of application Ser. No. 582,907.
- the sum of the cellulose content of the viscose and the best concentration of spinning bath acid, both expressed as a percentage, is approximately constant. For example, for a concentration of 7 percent caustic soda and a draw-off speed of 14 metres per minute,
- the constant is equal to from 12 to 13.
- the zinc sulphate concentration in the bath is 6 to 15 percent.
- the best yarn results have so far been obtained with 6 to 7 percent cellulose, 7 percent soda, 6 to 7 percent acid, 10 percent zinc sulphate, 3 percent polyethylene oxide on the weight of cellulose and an extrusion ratio of 0.7.
- Example 1 passed through a coiled lead tube immersed in the spinning bath and was thus heated to 50 C. and its ball fall viscosity reduced to 50 seconds.
- the draw-oil speed was 25 /2 metres per minute.
- the yarn was stretched percent through a second bath at 95 C. containing 3.0 percent sulphuric acid and less than 1.5 percent total salts and after washing, drying on a heated drum and collecting, had the following properties:
- Example 2 Viscose 6.6 percent cellulose of average DP 585, 7.0 percent caustic soda, 3.0 percent polyethylene oxide of average molecular weight 1500. Viscose temperature 20 C. Ball fall viscosity 130 seconds. Extrusion ratio 0.55.
- Salt figure 9.8 Draw oir' speed 28 metres per minute. Spin bath 8.0 percent sulphuric acid,
- oven dry extensibility It will be seen that the oven dry cord tenacity in the first example is about 36 percent higher than in the second example.
- a process for producing regenerated cellulose filaments having a substantially circular or bean shaped cross-section and a substantially all skin structure comprising extruding viscose, the cellulose of said viscose having a degree ofpolymerisation of at least 400, at a temperature of 40 C. to 60 C.
- the viscose contains from 6 to 7 percent cellulose, 7 percent caustic soda and 3 percent of polyethylene oxide based on the weight of cellulose
- the coagulating bath contains 6 to 7 percent acid, 10 percent zinc sulphate and the extrusion ratio is 0.7.
- Regenerated cellulose filaments having a substantially circular cross section with a smooth skin and an all skin structure produced by extruding viscose, the cellulose of which has a degree of polymerisation of at least 400 at a temperature of 40 C. to 60 C.
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- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- General Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Textile Engineering (AREA)
- Artificial Filaments (AREA)
Description
March 14, 1961 DRAW-OFF SPEEDWN METRES PER MlNUTE N E. E. TALLIS ET AL 2,975,023
PRODUCTION OF REGENERATED CELLULOSE FILAMENTS Filed June 25, 1958 I I F I 100 2 00 300 400 500 SEcoNDS BALL FALL VISCOSITY //71/e/7/0/$ .Emeg/ Edward E/fls DawdMc/za/son 549/ By f/ve/k af/omeys PRODUCTION OF REGENERATED CELLULOSE FILAMENTS Ernest Edward Tallis and David Nicholson Tyler, Coventry, England, assignors to Courtaulds Limited, London, England, a British company Filed June 23, 1958, Ser. No. 743,720 Claims priority, application Great Britain June 28, 1957 11 Claims. (11. 18-54) This invention relates to the production of regenerated cellulose filaments and the like from viscose and particularly to the rapid production of such filaments having a high tenacity and which can be twisted into high strength viscose rayon cords.
The tenacity of regenerated cellulose fibres can be increased by subjecting them immediately after spinning to stretching in a hot dilute acid bath, as described in US, patent specification No. 2,192,074. As described in the specification of co-pending patent applications Ser. Nos. 581,377 and 582,907, both now abandoned, and of copending application Serial No. 825,624, the addition to the viscose of polyethylene oxide or certain polyethylene oxide condensation products enables filaments to be produced having a thick skin and non-crenulated surface with a bean shaped cross-section and a diffuse boundary between the skin and core. Such filaments have a high wet tenacity and are capable of forming a cord of good tensile properties. The skin and core can be shown, and the skin and core differentiated by a staining technique as described for example in the Textile Research Journal 1945, page 443.
Also, in our co-pending application Ser. No. 629,512 we found that a significant improvement in fibre and cord properties particularly in the conditioned state at 65 percent relative humidity could be obtained by spinning, in the presence of polyethylene oxide or polyethylene oxide condensation products, viscose in which the degree of polymerisation of the cellulose is unusually high. We found however that the benefit of the longer chain length of the cellulose molecules is only obtained when certain spinning conditions are used and, in particular, that for a given value of ball fall viscosity of the viscose there is a critical speed of drawing the threads away from the jet which must not be exceeded if advantage is to be taken of the longer chain length.
Viscose is normally spun at 20 C., although proposals have been made to spin at higher temperatures, but very little advantage is gained in spinning normal viscose under these conditions. However, We have now found that if the viscose made from a cellulose having a high degree of polymerization (DR) and containing polyethylene oxide is extruded at an increased temperature, the drawofi speed of the filaments may be increased substantially, but to an extent limited by the ball-fall viscosity of the viscose at the extrusion temperature if advantage is to be taken of the effect of the high D.P in increasing the tenacity of the filaments. The draw-ofi speed should not substantially exceed the value defined by the curve shown inthe accompanying drawing, the ball fall viscosity being defined as the time taken for a steel ball of one eighth of an inch diameter to fall through 20 centimetres of viscose at the extrusion temperature, draw-oil speed is defined as the speed at which coagulated filaments are drawn through the spinning bath away from the spinnerette.
Patented Mar. 14, 1961 ice According to the invention therefore, regenerated cellulose filaments having a substantially circular or bean-shaped cross-section and a substantially all-skin structure are produced by extruding viscose, the cellulose of which has an average degree of polymerization of at least 400,'at a temperature of between 40 C. and 60 C. and at a salt point between 6 and 15, preferably from 8.5 to 12, into an aqueous coagulating bath containing sulphuric acid together with zinc sulphate and sodium sulphate, the total saltcontent preferably not exceeding 24 percent by weight, in the presence of between 0.5 and 10 percent by weight of the Weight of the cellulose of a polyethylene oxide of average molecular weight between 300 and 10,000, preferably between 600 and 6,000, at a draw off speed not substantially greater than that defined by the curve shown in the accompanying drawing, the ball fall viscosity being defined as the number of seconds taken by a steel ball one eighth of an inch in diameter to fall through 20 centimetres of viscose at the extrusion temperature.
As indicated in the figure, the viscosities used in the present process range from about 40 to about 400 seconds.
To develop high tenacity, the filaments should be subjected to hot-stretching, in accordance with US. patent specification No. 2,192,074 in a hot aqueous acid bath preferably containing at least 3 percent of sulphuric acid. Regeneration of the filaments should be substantially complete when the filaments leave this bath.
The salt point is defined in its normal sense, as the percentage strength of an aqueous sodium chloride solution required just to coagulate the viscose at 15 C.
Where practicable, improved properties are obtained by spinning at an extrusion ratio less than one. The extrusion ratio is the ratio of the speed at which the filaments are drawn from the jet to the speed at which the viscose passes through the jet orifices.
The polyethylene oxide is preferably added to the viscose and may be added in the form of a condensation product as described in the specification of application Ser. No. 582,907.
For any given content of caustic soda in the viscose and spinning speed, the sum of the cellulose content of the viscose and the best concentration of spinning bath acid, both expressed as a percentage, is approximately constant. For example, for a concentration of 7 percent caustic soda and a draw-off speed of 14 metres per minute,
the constant is equal to from 12 to 13.
Preferably, the zinc sulphate concentration in the bath is 6 to 15 percent. The best yarn results have so far been obtained with 6 to 7 percent cellulose, 7 percent soda, 6 to 7 percent acid, 10 percent zinc sulphate, 3 percent polyethylene oxide on the weight of cellulose and an extrusion ratio of 0.7.
In the following examples, proportions are by weight.
Example 1 passed through a coiled lead tube immersed in the spinning bath and was thus heated to 50 C. and its ball fall viscosity reduced to 50 seconds. The draw-oil speed was 25 /2 metres per minute. The yarn was stretched percent through a second bath at 95 C. containing 3.0 percent sulphuric acid and less than 1.5 percent total salts and after washing, drying on a heated drum and collecting, had the following properties:
Denier 1008. Oven dry tenacity 5.95 grams per denier. 'Oven dry extensibility 7.4 percent.
Conditioned tenacity (65 percent relative humidity) -2 p.84 grams per denier. Conditioned extensibility 9.9 percent. Wet tenacity 3.87 grams per denier. Wet extensibility 22.0 percent.
Example 2 Viscose 6.6 percent cellulose of average DP 585, 7.0 percent caustic soda, 3.0 percent polyethylene oxide of average molecular weight 1500. Viscose temperature 20 C. Ball fall viscosity 130 seconds. Extrusion ratio 0.55.
Salt figure 9.8 Draw oir' speed 28 metres per minute. Spin bath 8.0 percent sulphuric acid,
10.0 percent zinc sulphate, 11.0 percent sodium sulphate, 55 C. Stretch 80 percent in bath as first example. The yarn and cord properties were as follows:
Yarn, denier 1675. Oven dry tenacity 5.05 grams per denler. Oven dry extensibility 7.5 percent. Conditioned tenacity (65 percent relative humidity) 4.21 grams per denier. Conditioned extensibility 10.0 percent. Wet tenacity 2.77 grams per denier. Wet extensibility 18.4 percent. 12 S x 12 Z cord, denier 3860. Oven dry breaking load 29.1 lb. Oven dry tenacity 3.42 grams per denier.
Oven dry extensibility It will be seen that the oven dry cord tenacity in the first example is about 36 percent higher than in the second example.
What we claim is:
l. A process for producing regenerated cellulose filaments having a substantially circular or bean shaped cross-section and a substantially all skin structure comprising extruding viscose, the cellulose of said viscose having a degree ofpolymerisation of at least 400, at a temperature of 40 C. to 60 C. at a salt point between 6 and 15, and at an extrusion ratio of less than 1 into an aqueous coagulating bath containing sulphuric acid and zinc sulphate and sodium sulphate, in the presence of between 0.5 and 10 percent by weight of the weight of the cellulose of a polyethylene oxide of average molecular weight between 300 and 10,000 at a draw ofi speed not substantially greater than that defined by the curve shown in the figure accompanying this specification, and at a ball fall viscosity of between about 40 and about 400 seconds, the ball fall viscosity being defined as the number of seconds taken by a steel ball one eighth 11.5 percent.
4 of an inch in diameter to fall through twenty centimetres of viscose at the extrusion temperature.
2. A process according to claim 1, in which upon emerging from the coagulating bath, the filaments are stretched in a hot acid bath.
3. A process according to claim 1 in which the salt point of the viscose is between 8.5 and 12 inclusive.
4. A process according to claim 1, in which the total salt content of the coagulating bath does not exceed 24 percent by weight.
5. A process according to claim 1, in which the average molecular weight of the polyethylene oxide is between 600 and 6,000.
6. A process according to claim 1, in which the polyethylene oxide is added to the viscose.
7. A process according to claim 1, in which the concentration of zinc sulphate in the coagulating bath is from 6 to 15 percent by weight.
8. A process according to claim 4, in which the viscose contains from 6 to 7 percent cellulose, 7 percent caustic soda and 3 percent of polyethylene oxide based on the weight of cellulose, the coagulating bath contains 6 to 7 percent acid, 10 percent zinc sulphate and the extrusion ratio is 0.7.
9. A process according to claim 1, in which the viscose contains not more than 5 percent of cellulose and has a ball fall viscosity of from 25 to 67, the percentage of sulphuric acid in the coagulating bath is from 0.9 to 1.5 times the percentage of caustic soda in the viscose, and the bath contains 3 to 15 percent of zinc sulphate.
10. A process according to claim 10, in which the percentage of sulphuric acid in the coagulating bath is from 1.15 to 1.40 times the percentage of caustic soda in the viscose.
11. Regenerated cellulose filaments having a substantially circular cross section with a smooth skin and an all skin structure produced by extruding viscose, the cellulose of which has a degree of polymerisation of at least 400 at a temperature of 40 C. to 60 C. at a salt point between 6 and 15 and at an extrusion ratio of less than 1 into an aqueous coagulating bath containing sulphuric acid and zinc sulphate and sodium sulphate, in the presence of between 0.5 and 10 percent by weight of the weight of the cellulose of a polyethylene oxide of average molecular weight between 300 and 10,000 at a draw ofi speed not substantially greater than that defined by the curve shown in the figure accompanying this specification and at a ball fall viscosity of between about 40 and about 400 seconds, the ball fall viscosity being defined as the number of seconds taken by a steel ball one eighth of an inch in diameter to fall through twenty centimeters of viscose at the extrusion temperature;
References Cited in the file of this patent UNITED STATES PATENTS Ott, E. Spurlin, H. M. Grafiiin, M. W. High Polymers, vol. V, 2nd edition (1955), pages 13291334.
pAAAA A p Emma- UNITED STATES PATENT OFFICE vCE'RTIIFICATIO N OF CORRECTION Patent No. 2,975 O23 March 14, 1961 Ernest Edward Tallis et a1.
It is Hereby certified that error appears in the ,above .nqmbered petlent requiring correction and"that the said Letters Patent should read'as corrected below.
Column 4, line 31 for the c laim reference numeral "10" read 9 Signed and sealed this 22nd day of August 1961.
(SEAL) Attest:
ERNEST W. SWIDER Attesting Officer DAVID L. LADD Commissioner of Patents
Claims (1)
1. A PROCESS FOR PRODUCING REGENERATED CELLULOSE FILAMENTS HAVING A SUBSTANTIALLY CIRCULAR OR BEAN SHAPED CROSS-SECTION ANS A SUBSTANTIALLY ALL SKIN STRUCTURE COMPRISING EXTRUDING VISCOSE, THE CELLULOSE OF SAID VISCOSE HAVING A DEGREE OF POLYMERISATION OF AT LEAST 400, AT A TEMPERATURE OF 40*C. TO 60*C. AT 60*C. AT A SALT POINT BETWEEN 6 AND 15, AND AT AN EXTRUSION RATIO OF LESS THAN 1 INTO AN AQUEOUS COAGULATING BATH CONTAINING SULPHURIC ACID AND ZINC SULPHATE AND SODIUM SULPHATE, IN THE PRESENCE OF BETWEEN 0.5 AND 10 PERCENT BY WEIGHT OF THE WEIGHT OF THE CELLULOSE OF A POLYETHYLENE OXIDE OF AVERAGE MOLECULAR WEIGHT BETWEEN 300 AND 10,000 AT A DRAW OFF SPEED NOT SUBSTANTIALLY GREATER THAN THAT DEFINED BY THE CURVE SHOWN IN THE FIGURE ACCOMPANYING THIS SPECIFICATION, AND AT A BALL FALL VISCOSITY OF BETWEEN ABOUT 40 AND ABOUT 400 SECONDS, THE BALL FALL VISCOSITY BEING DEFINED AS THE NUMBER OF SECONDS TAKEN BY A STEEL BALL ONE EIGHTH OF AN INCH IN DIAMETER TO FALL THROUGH TWENTY CENTIMETERS OF VISCOSE AT THE ECTRUSION TEMPERATURE
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GB36893/55A GB815509A (en) | 1956-07-25 | 1956-07-25 | Improvements relating to the production of regenerated cellulose filaments |
GB20439/57A GB827415A (en) | 1956-07-25 | 1957-06-28 | Improvements relating to the production of regenerated cellulose filaments |
Publications (1)
Publication Number | Publication Date |
---|---|
US2975023A true US2975023A (en) | 1961-03-14 |
Family
ID=32395985
Family Applications (2)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US3126435D Expired - Lifetime US3126435A (en) | 1956-07-25 | Production of regenerated cellulose | |
US743720A Expired - Lifetime US2975023A (en) | 1956-07-25 | 1958-06-23 | Production of regenerated cellulose filaments |
Family Applications Before (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US3126435D Expired - Lifetime US3126435A (en) | 1956-07-25 | Production of regenerated cellulose |
Country Status (5)
Country | Link |
---|---|
US (2) | US2975023A (en) |
BE (2) | BE568921A (en) |
CH (1) | CH356240A (en) |
DE (1) | DE1072354B (en) |
FR (1) | FR1168249A (en) |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3277226A (en) * | 1962-04-09 | 1966-10-04 | Fmc Corp | Viscose rayon fiber and method of making same |
DE2512410A1 (en) * | 1975-03-21 | 1976-09-23 | Didier Eng | PROCEDURE FOR THE REMOVAL OF NITROGEN OXIDES AND INSTALLATION FOR CARRYING OUT THE PROCEDURE |
Families Citing this family (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
NL293298A (en) * | 1962-05-28 | |||
US3720743A (en) * | 1970-10-20 | 1973-03-13 | Itt | Process for producing high performance crimped rayon staple fiber |
AT506268B1 (en) * | 2008-01-11 | 2014-08-15 | Chemiefaser Lenzing Ag | MICROFIBRE |
Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2775505A (en) * | 1952-06-05 | 1956-12-25 | American Viscose Corp | Spinning regenerated cellulose filaments |
US2810658A (en) * | 1954-08-16 | 1957-10-22 | Du Pont | Process for spinning modified viscose solution |
US2841462A (en) * | 1955-06-29 | 1958-07-01 | American Viscose Corp | Production of all skin rayon |
US2860480A (en) * | 1956-04-18 | 1958-11-18 | Du Pont | Regenerated cellulose structures and process for producing them |
Family Cites Families (14)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2479218A (en) * | 1944-12-12 | 1949-08-16 | Int Paper Canada | Process for making rayon filaments |
FR961352A (en) * | 1947-04-26 | 1950-05-11 | ||
US2674025A (en) * | 1949-08-15 | 1954-04-06 | Texiclon Corp | Polymeric filaments |
NL92810C (en) * | 1949-08-25 | |||
US2536094A (en) * | 1949-09-17 | 1951-01-02 | American Viscose Corp | Process for spinning artificial fibers |
US2592355A (en) * | 1949-11-21 | 1952-04-08 | Tachikawa Shozo | Process for manufacturing macromolecular cellulose fiber |
US2792313A (en) * | 1950-04-08 | 1957-05-14 | Int Paper Canada | Manufacture of cellulose |
US2612679A (en) * | 1950-10-23 | 1952-10-07 | Ladisch Rolf Karl | Filaments containing fillers |
BE523478A (en) * | 1951-05-29 | |||
US2710861A (en) * | 1951-08-20 | 1955-06-14 | Int Paper Canada | Treatment of cellulose with the reaction product of primary aliphatic amines and ethylene oxide |
US2664360A (en) * | 1951-08-20 | 1953-12-29 | Int Paper Canada | Manufacture of cellulose |
US2732279A (en) * | 1951-12-07 | 1956-01-24 | Shozo tachikawa | |
US2937922A (en) * | 1954-03-24 | 1960-05-24 | Rayonier Inc | Viscose process |
US2852333A (en) * | 1954-05-21 | 1958-09-16 | Du Pont | Viscose spinning process |
-
0
- DE DENDAT1072354D patent/DE1072354B/en active Pending
- BE BE553667D patent/BE553667A/xx unknown
- US US3126435D patent/US3126435A/en not_active Expired - Lifetime
- BE BE568921D patent/BE568921A/xx unknown
-
1956
- 1956-12-22 CH CH356240D patent/CH356240A/en unknown
- 1956-12-28 FR FR1168249D patent/FR1168249A/en not_active Expired
-
1958
- 1958-06-23 US US743720A patent/US2975023A/en not_active Expired - Lifetime
Patent Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2775505A (en) * | 1952-06-05 | 1956-12-25 | American Viscose Corp | Spinning regenerated cellulose filaments |
US2810658A (en) * | 1954-08-16 | 1957-10-22 | Du Pont | Process for spinning modified viscose solution |
US2841462A (en) * | 1955-06-29 | 1958-07-01 | American Viscose Corp | Production of all skin rayon |
US2860480A (en) * | 1956-04-18 | 1958-11-18 | Du Pont | Regenerated cellulose structures and process for producing them |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3277226A (en) * | 1962-04-09 | 1966-10-04 | Fmc Corp | Viscose rayon fiber and method of making same |
DE2512410A1 (en) * | 1975-03-21 | 1976-09-23 | Didier Eng | PROCEDURE FOR THE REMOVAL OF NITROGEN OXIDES AND INSTALLATION FOR CARRYING OUT THE PROCEDURE |
Also Published As
Publication number | Publication date |
---|---|
US3126435A (en) | 1964-03-24 |
BE553667A (en) | |
DE1072354B (en) | 1959-12-31 |
FR1168249A (en) | 1958-12-05 |
BE568921A (en) | |
CH356240A (en) | 1961-08-15 |
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