US2444022A - Process of making a solution of cellulose - Google Patents
Process of making a solution of cellulose Download PDFInfo
- Publication number
- US2444022A US2444022A US700354A US70035446A US2444022A US 2444022 A US2444022 A US 2444022A US 700354 A US700354 A US 700354A US 70035446 A US70035446 A US 70035446A US 2444022 A US2444022 A US 2444022A
- Authority
- US
- United States
- Prior art keywords
- cellulose
- solution
- solutions
- hydrogen peroxide
- sodium
- 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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- 229920002678 cellulose Polymers 0.000 title description 57
- 239000001913 cellulose Substances 0.000 title description 57
- 238000000034 method Methods 0.000 title description 18
- 239000000243 solution Substances 0.000 description 50
- MHAJPDPJQMAIIY-UHFFFAOYSA-N Hydrogen peroxide Chemical compound OO MHAJPDPJQMAIIY-UHFFFAOYSA-N 0.000 description 34
- 238000004519 manufacturing process Methods 0.000 description 21
- WSFSSNUMVMOOMR-UHFFFAOYSA-N Formaldehyde Chemical compound O=C WSFSSNUMVMOOMR-UHFFFAOYSA-N 0.000 description 18
- 239000000203 mixture Substances 0.000 description 12
- 238000001816 cooling Methods 0.000 description 11
- 230000015556 catabolic process Effects 0.000 description 10
- 238000006731 degradation reaction Methods 0.000 description 10
- 238000002156 mixing Methods 0.000 description 10
- HEMHJVSKTPXQMS-UHFFFAOYSA-M Sodium hydroxide Chemical compound [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 description 9
- HVTHJRMZXBWFNE-UHFFFAOYSA-J sodium zincate Chemical compound [OH-].[OH-].[OH-].[OH-].[Na+].[Na+].[Zn+2] HVTHJRMZXBWFNE-UHFFFAOYSA-J 0.000 description 9
- 238000009987 spinning Methods 0.000 description 7
- LGQLOGILCSXPEA-UHFFFAOYSA-L nickel sulfate Chemical compound [Ni+2].[O-]S([O-])(=O)=O LGQLOGILCSXPEA-UHFFFAOYSA-L 0.000 description 6
- 238000011282 treatment Methods 0.000 description 6
- NWONKYPBYAMBJT-UHFFFAOYSA-L zinc sulfate Chemical compound [Zn+2].[O-]S([O-])(=O)=O NWONKYPBYAMBJT-UHFFFAOYSA-L 0.000 description 6
- DGAQECJNVWCQMB-PUAWFVPOSA-M Ilexoside XXIX Chemical compound C[C@@H]1CC[C@@]2(CC[C@@]3(C(=CC[C@H]4[C@]3(CC[C@@H]5[C@@]4(CC[C@@H](C5(C)C)OS(=O)(=O)[O-])C)C)[C@@H]2[C@]1(C)O)C)C(=O)O[C@H]6[C@@H]([C@H]([C@@H]([C@H](O6)CO)O)O)O.[Na+] DGAQECJNVWCQMB-PUAWFVPOSA-M 0.000 description 4
- 229910052783 alkali metal Inorganic materials 0.000 description 4
- 150000001340 alkali metals Chemical class 0.000 description 4
- TVQLLNFANZSCGY-UHFFFAOYSA-N disodium;dioxido(oxo)tin Chemical compound [Na+].[Na+].[O-][Sn]([O-])=O TVQLLNFANZSCGY-UHFFFAOYSA-N 0.000 description 4
- 239000007800 oxidant agent Substances 0.000 description 4
- 239000012266 salt solution Substances 0.000 description 4
- 229910052708 sodium Inorganic materials 0.000 description 4
- 239000011734 sodium Substances 0.000 description 4
- 229940079864 sodium stannate Drugs 0.000 description 4
- LSNNMFCWUKXFEE-UHFFFAOYSA-M Bisulfite Chemical compound OS([O-])=O LSNNMFCWUKXFEE-UHFFFAOYSA-M 0.000 description 3
- 239000012670 alkaline solution Substances 0.000 description 3
- 229940071182 stannate Drugs 0.000 description 3
- 125000005402 stannate group Chemical group 0.000 description 3
- LSNNMFCWUKXFEE-UHFFFAOYSA-L sulfite Chemical compound [O-]S([O-])=O LSNNMFCWUKXFEE-UHFFFAOYSA-L 0.000 description 3
- 229920003043 Cellulose fiber Polymers 0.000 description 2
- 229920000742 Cotton Polymers 0.000 description 2
- PXHVJJICTQNCMI-UHFFFAOYSA-N Nickel Chemical compound [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 description 2
- CDBYLPFSWZWCQE-UHFFFAOYSA-L Sodium Carbonate Chemical compound [Na+].[Na+].[O-]C([O-])=O CDBYLPFSWZWCQE-UHFFFAOYSA-L 0.000 description 2
- 239000003054 catalyst Substances 0.000 description 2
- 238000004090 dissolution Methods 0.000 description 2
- 238000002360 preparation method Methods 0.000 description 2
- 230000002035 prolonged effect Effects 0.000 description 2
- 230000005070 ripening Effects 0.000 description 2
- 238000003756 stirring Methods 0.000 description 2
- QAOWNCQODCNURD-UHFFFAOYSA-L Sulfate Chemical compound [O-]S([O-])(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-L 0.000 description 1
- KSHPUQQHKKJVIO-UHFFFAOYSA-N [Na].[Zn] Chemical compound [Na].[Zn] KSHPUQQHKKJVIO-UHFFFAOYSA-N 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 239000003795 chemical substances by application Substances 0.000 description 1
- 238000005520 cutting process Methods 0.000 description 1
- 125000002485 formyl group Chemical class [H]C(*)=O 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- WSFSSNUMVMOOMR-NJFSPNSNSA-N methanone Chemical compound O=[14CH2] WSFSSNUMVMOOMR-NJFSPNSNSA-N 0.000 description 1
- 229910052759 nickel Inorganic materials 0.000 description 1
- 230000001590 oxidative effect Effects 0.000 description 1
- 238000003825 pressing Methods 0.000 description 1
- 230000001105 regulatory effect Effects 0.000 description 1
- 150000003839 salts Chemical class 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 229910021653 sulphate ion Inorganic materials 0.000 description 1
- 229910052725 zinc Inorganic materials 0.000 description 1
Classifications
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08B—POLYSACCHARIDES; DERIVATIVES THEREOF
- C08B1/00—Preparatory treatment of cellulose for making derivatives thereof, e.g. pre-treatment, pre-soaking, activation
- C08B1/003—Preparation of cellulose solutions, i.e. dopes, with different possible solvents, e.g. ionic liquids
Definitions
- Patented June 29, 1948 Fries PROCESS OF MAKING A SOLUTION OF CELLULOSE v Buurman, 'Velp, Netherlands, assignor to American Enka Co rporation, Enka, N. 0., a corporation of Delaware No Drawing. Application September 30, 1946, Serial No. 700,354. .In Germany June 27, 1941 Section 1. Public Law 690, August 8, 1946 Patent expires June 2'7, 1961 i 11 Claims.
- the present invention relates to the manu-' iacture oi cellulosic solutions to be employed in the production of threads, filaments, films and the like, and more particularly to a method of preparing alkali metal salt solutions 04 soda celhereinafter generically referred to as cellulose.
- the cellulose is first heated to a temperature of about 115 C. and then cut up and finally dissolvedat a temperature of about 0 C.
- the celulose can also be chemically degraded by treatment with bisulphite solutions under pressure or by treatment with dilute sodium hydroxide followed by a substantial ripening.
- Such degraded cellulose can then be dissolved in solutions of sodium zincate or sodium stannate by cooling the mixture to 0 C. or below, and maintaining this low temperature until complete dissolution 01' the cellulose fibers, whereupon the solutions are warmed up quickly to room temperature and formed into artificial products.
- the present invention contemplates a process of forming cellulosic solutions of an alkaline metal salt wherein it is unnecessary to degrade the cellulose by prolonged treatment with bisulphite solutions under pressure or by treatment with the dilute sodium hydroxide solution followed by ripening,
- inz aldehyde may be added stage in the process.
- the time required for the degradation of the cellulose can also be regulated by utilizing a constant temperature at which the degradation takes place, or by using catalysts or by both fixing the temperature and using a catalyst.
- the present invention represents a substantial simplification of the known methods of preparing these stypes oi solutions wherein both the old and the new methods degrade the cellulose to a measured extent prior to the formation of the soution. It is a,
- Example 1 3350 gms. or sodium zincate solution at 25 C. containing 9.3% NaQH and 2.3% Zn. wasmixed with 330 gms. hydrogen peroxide (3%) and the mixture was thoroughly stirred. 320 gms. of cut troduce normal cellulose, i. e., soda cellulose, sulphite cellulose, or cotton linters, immediately into a dilute alkaline solution of sodium zincate or sodium stannaite containing an oxidizing agent.
- normal cellulose i. e., soda cellulose, sulphite cellulose, or cotton linters
- an oxidizing agent such as hydrogen peroxide is first mixed with a dilute solution of sodium zincate or sodium stannate, and uniformly cut up cellulose is introduced with stirring. The mixture forms a thick pulp which is left standing until the desired degree of degradation of the cellulose is reached. Then the known procedure is followed, namely,
- areducing agent such as formaldehyde
- suitable chemicals for example, areducing agent such as formaldehyde may be added so as to prevent further degradation or the cellulose.
- areducing agent such as formaldehyde
- the formpulp was cooled down to -,7 C. resulting in dissolution of the cellulose.
- the solution was then warmed up to 16 C. and was in proper condition for spinning. Further degradation of the cellulose by an excess of hydrogen peroxide was prevented by adding 5cm of formaldehyde.
- the spinning solution obtained in this manner was stable and easily spinna-ble.
- Example 2 20 mg. of, nickel sulphate was added to 3650 to the solution either before cooling the cellulose pulp or at a later l 3 What is claimed is:
- a process for the manufacture of cellulosic filaments, films and the like which comprises adding hydrogen peroxide to a dilute alkali metal salt solution of the class consisting of alkaline zincate and stannate solutions, mixing cellulose with the solution to form a thick pulp, allowing the cellulose to degrade sufllciently at a constant temperature and in the presence of nickel sulphate and then cooling the mixture below 0 C. whereupon the cellulose is immediately dissolved.
- a process for the manufacture of cellulosic solutions to be used in the production of threads, filaments, films and the like which comprises adding hydrogen peroxide to a dilute alkali metal salt solution of the class consisting of alkaline zincate and stannate solutions, mixing cellulose with the solution to form a thick pulp, allowing the cellulose to degrade sufliciently, destroying the excess hydrogen peroxide with formaldehyde to prevent further degradation of the cellulose, and
- a process for the manufacture of cellulosic solutions to be used in the production of threads, filaments, films and the like which comprises adding hydrogen peroxide to a dilute alkali metal salt solution. of the class consisting of alkaline zincate and stannate solutions, mixing cellulose with the solution to form a thick pulp, allowing the cellulose to degradesufliciently at a constant temperature and in the presence of nickel sulphate, destroying the excess hydrogen peroxide with formaldehyde to prevent further degrade tion'of the cellulose and then cooling the mixture below 0 C. whereupon the cellulose is immediately dissolved.
- a dilute alkali metal salt solution of the class consisting of alkaline zincate and stannate solutions
- a process for the manufacture of cellulosic solutions to be used in the productions 0! threads, filaments, films and the like which comprises adding hydrogen peroxide to a dilute sodium zincate solution at approximately 25 C., mixing cellulose with the solution to form a thick pulp, allowing the cellulose to degrade for about 48 hours at the same temperature, cooling the mixture below 0 C. whereupon the cellulose is immediately dissolved and then raising the solution to room temperature in readiness for spinning.
- a process for the manufacture of cellulosic solutions to be used in the production of threads, filaments, films and the like which comprises adding nickel sulphate and hydrogen peroxide to a dilute sodium zincate solution at approximately 25 C., mixing cellulose with the solution to form a thick pulp. allowing the cellulose to degrade for about 48 hours at the same temperature, cooling the mixture below 0 C. whereupon the cellulose is immediately dissolved and then raising the solution'to room temperature in readiness for spinning.
- a processfor the manufacture oi cellulosic solutions to be used in the production of threads, filaments, films'and the like which comprises adding hydrogen peroxide to a dilute sodium zincate solution at approximately 25 C., mixing cellulose with the solution to form a thick pulp, allowing the cellulose to degrade for about 48 hours at the same temperature, adding sufficient formaldehyde to prevent further degradation of the cellulose, cooling the mixture below 0 C. whereupon thecellulose' is immediately dissolved and then raising the solution to room temperature in readiness for spinning.
- filaments, films and the like whichcomprises adding hydrogen peroxide to a dilute sodium 1 zincate solution, mixing cellulose with the solu-, tion toform a thick pulp, allowing the cellulose to degrade sufilcientlyv at a constant temperatureand in the presence of nickel sulphate and'th'en-j cooling the mixture below. 0 C. whereuponthe, v
- filaments, films and the like which comprises adding hydrogen peroxide to a dilute sodium zinc- .ate solution, mixing cellulose with the solution to form a thick pulp, allowing the cellulose to degrade sufilciently, destroying the excess hydrogen peroxide with formaldehyde, to prevent a further degradation of the cellulose, and then cooling the mixture below 0 C. whereupon the cellulose is immediately dissolved.
- filaments, films and the like which comprises.' adding hydrogen peroxide to a dilute sodium' zincate solution, mixing cellulose with the soluto adilute sodium" zincate solution at approximately 2590., mixing cellulose with the solution to form a thick pulp, allowing the cellulose to demixture below- 0 Ciiwhereupon the. cellulose is immediately dissolved andthen raising the solu- 'tionroom't m erature in. readiness for spinning.
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- Chemical & Material Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- Engineering & Computer Science (AREA)
- Biochemistry (AREA)
- Materials Engineering (AREA)
- Health & Medical Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Medicinal Chemistry (AREA)
- Polymers & Plastics (AREA)
- Organic Chemistry (AREA)
- Artificial Filaments (AREA)
Description
Patented June 29, 1948 Fries PROCESS OF MAKING A SOLUTION OF CELLULOSE v Buurman, 'Velp, Netherlands, assignor to American Enka Co rporation, Enka, N. 0., a corporation of Delaware No Drawing. Application September 30, 1946, Serial No. 700,354. .In Germany June 27, 1941 Section 1. Public Law 690, August 8, 1946 Patent expires June 2'7, 1961 i 11 Claims.
The present invention relates to the manu-' iacture oi cellulosic solutions to be employed in the production of threads, filaments, films and the like, and more particularly to a method of preparing alkali metal salt solutions 04 soda celhereinafter generically referred to as cellulose.
It is known to manufacture artificial products from alkaline solutions of sodium zincate or sodium stannate, having cellulose dissolved therein.
.lulose. sulphite cellulose, or cotton linters, etc.,
There ,are several methods of preparing-these solutions, e. g., the cellulose is first heated to a temperature of about 115 C. and then cut up and finally dissolvedat a temperature of about 0 C. The celulose can also be chemically degraded by treatment with bisulphite solutions under pressure or by treatment with dilute sodium hydroxide followed by a substantial ripening. Such degraded cellulose can then be dissolved in solutions of sodium zincate or sodium stannate by cooling the mixture to 0 C. or below, and maintaining this low temperature until complete dissolution 01' the cellulose fibers, whereupon the solutions are warmed up quickly to room temperature and formed into artificial products.
The present invention contemplates a process of forming cellulosic solutions of an alkaline metal salt wherein it is unnecessary to degrade the cellulose by prolonged treatment with bisulphite solutions under pressure or by treatment with the dilute sodium hydroxide solution followed by ripening,
It is a further object of the invention to inz aldehyde may be added stage in the process. The time required for the degradation of the cellulose can also be regulated by utilizing a constant temperature at which the degradation takes place, or by using catalysts or by both fixing the temperature and using a catalyst. I
' It can be readily seen that the present invention represents a substantial simplification of the known methods of preparing these stypes oi solutions wherein both the old and the new methods degrade the cellulose to a measured extent prior to the formation of the soution. It is a,
substantial saving to eliminate the prolonged treatments of cellulose with bisulphite solutions at high temperatures and under pressure, or
treatments with dilute sodium hydroxide, which in turn necessltatesdipping, pressing and cutting up of the cellulose fibers. Incontra-distinction, the cellulose is immediately introduced into a dilute alkaline solution of sodium zincate or sodium stannate which has-previously. been mixed with an oxidizing agent. Thus, by allowing the pulp to age in this condition, an oxidizing degradation of the cellulose takes place.
Example 1 3350 gms. or sodium zincate solution at 25 C. containing 9.3% NaQH and 2.3% Zn. wasmixed with 330 gms. hydrogen peroxide (3%) and the mixture was thoroughly stirred. 320 gms. of cut troduce normal cellulose, i. e., soda cellulose, sulphite cellulose, or cotton linters, immediately into a dilute alkaline solution of sodium zincate or sodium stannaite containing an oxidizing agent.
In the preparation of the solution, an oxidizing agent such as hydrogen peroxide is first mixed with a dilute solution of sodium zincate or sodium stannate, and uniformly cut up cellulose is introduced with stirring. The mixture forms a thick pulp which is left standing until the desired degree of degradation of the cellulose is reached. Then the known procedure is followed, namely,
up sulphite cellulose with a moisture content 01' 10% was added to this solution under constant stirring. A thick rpulp formedwhich was left standing for 48 hours at 25 C., whereafter the the 'pulp is cooled down to below 0 C. with the result that the cellulose dissolves, and the solution is then quickly warmed up to about room temperature and is in readiness for spinning. into threads, films, and the like.
During the preparation of the solution, if any excess of oxidizing agent is present, suitable chemicals, for example, areducing agent such as formaldehyde may be added so as to prevent further degradation or the cellulose. The formpulp was cooled down to -,7 C. resulting in dissolution of the cellulose. The solution was then warmed up to 16 C. and was in proper condition for spinning. Further degradation of the cellulose by an excess of hydrogen peroxide was prevented by adding 5cm of formaldehyde. The spinning solution obtained in this manner was stable and easily spinna-ble.
Example 2 20 mg. of, nickel sulphate was added to 3650 to the solution either before cooling the cellulose pulp or at a later l 3 What is claimed is:
1. A process for the manufacture of cellulosic filaments, films and the like, which comprises adding hydrogen peroxide to a dilute alkali metal salt solution of the class consisting of alkaline zincate and stannate solutions, mixing cellulose with the solution to form a thick pulp, allowing the cellulose to degrade sufllciently at a constant temperature and in the presence of nickel sulphate and then cooling the mixture below 0 C. whereupon the cellulose is immediately dissolved.
3. A process for the manufacture of cellulosic solutions to be used in the production of threads, filaments, films and the like, which comprises adding hydrogen peroxide to a dilute alkali metal salt solution of the class consisting of alkaline zincate and stannate solutions, mixing cellulose with the solution to form a thick pulp, allowing the cellulose to degrade sufliciently, destroying the excess hydrogen peroxide with formaldehyde to prevent further degradation of the cellulose, and
then cooling the mixture below 0 C. whereupon the cellulose is immediately dissolved.
4. A process for the manufacture of cellulosic solutions to be used in the production of threads, filaments, films and the like, which comprises adding hydrogen peroxide to a dilute alkali metal salt solution. of the class consisting of alkaline zincate and stannate solutions, mixing cellulose with the solution to form a thick pulp, allowing the cellulose to degradesufliciently at a constant temperature and in the presence of nickel sulphate, destroying the excess hydrogen peroxide with formaldehyde to prevent further degrade tion'of the cellulose and then cooling the mixture below 0 C. whereupon the cellulose is immediately dissolved. e
5. A process for the manufacture of cellulosic to degrade sufilciently at a constant temperature and in the presence of nickel sulphate. destroying the excess hydrogen peroxide with formaldehyde to prevent further degradation of .the cellulose and then cooling the mixture below 0- C. whereupon the cellulose is immediately dissolved.
8. A process for the manufacture of cellulosic solutions to be used in the productions 0! threads, filaments, films and the like. which comprises adding hydrogen peroxide to a dilute sodium zincate solution at approximately 25 C., mixing cellulose with the solution to form a thick pulp, allowing the cellulose to degrade for about 48 hours at the same temperature, cooling the mixture below 0 C. whereupon the cellulose is immediately dissolved and then raising the solution to room temperature in readiness for spinning.
9. A process for the manufacture of cellulosic solutions to be used in the production of threads, filaments, films and the like, which comprises adding nickel sulphate and hydrogen peroxide to a dilute sodium zincate solution at approximately 25 C., mixing cellulose with the solution to form a thick pulp. allowing the cellulose to degrade for about 48 hours at the same temperature, cooling the mixture below 0 C. whereupon the cellulose is immediately dissolved and then raising the solution'to room temperature in readiness for spinning.
10. A processfor the manufacture oi cellulosic solutions to be used in the production of threads, filaments, films'and the like, which comprises adding hydrogen peroxide to a dilute sodium zincate solution at approximately 25 C., mixing cellulose with the solution to form a thick pulp, allowing the cellulose to degrade for about 48 hours at the same temperature, adding suficient formaldehyde to prevent further degradation of the cellulose, cooling the mixture below 0 C. whereupon thecellulose' is immediately dissolved and then raising the solution to room temperature in readiness for spinning.
. 11. A process for the manufacture of cellulosic solutions to be used in the production of threads, filaments, films, and the like, which comprises adding 'nickel' sulphate'and hydrogen peroxide solutions to be used in the production of threads,
filaments, films and the like, whichcomprises adding hydrogen peroxide to a dilute sodium 1 zincate solution, mixing cellulose with the solu-, tion toform a thick pulp, allowing the cellulose to degrade sufilcientlyv at a constant temperatureand in the presence of nickel sulphate and'th'en-j cooling the mixture below. 0 C. whereuponthe, v
cellulose is immediately dissolved. V
6. 'A process for the manufacture of'cellulosic solutions to be used in'the production of threads,v
filaments, films and the like, which comprises adding hydrogen peroxide to a dilute sodium zinc- .ate solution, mixing cellulose with the solution to form a thick pulp, allowing the cellulose to degrade sufilciently, destroying the excess hydrogen peroxide with formaldehyde, to prevent a further degradation of the cellulose, and then cooling the mixture below 0 C. whereupon the cellulose is immediately dissolved. 3
7. A process for the manufacture'of cellulosic,
solutions to be used in the production of threads,
filaments, films and the like, which comprises.' adding hydrogen peroxide to a dilute sodium' zincate solution, mixing cellulose with the soluto adilute sodium" zincate solution at approximately 2590., mixing cellulose with the solution to form a thick pulp, allowing the cellulose to demixture below- 0 Ciiwhereupon the. cellulose is immediately dissolved andthen raising the solu- 'tionroom't m erature in. readiness for spinning.
.1. 'N SIG V The following" references are fof record in the file of this patent: I
UNITED STATES PATENTS
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE2444022X | 1941-06-27 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| US2444022A true US2444022A (en) | 1948-06-29 |
Family
ID=7995899
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| US700354A Expired - Lifetime US2444022A (en) | 1941-06-27 | 1946-09-30 | Process of making a solution of cellulose |
Country Status (1)
| Country | Link |
|---|---|
| US (1) | US2444022A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US2724632A (en) * | 1954-08-09 | 1955-11-22 | Londat Aetz Fabric Co | Cyanoethylated cellulose textiles modified with chromic and periodic acids and process of making same |
| US2887398A (en) * | 1953-09-08 | 1959-05-19 | Leslie L Balassa | Composition of cellulose and an alkali biuret metal complex |
Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE118836C (en) * | ||||
| US646799A (en) * | 1899-10-26 | 1900-04-03 | Emile Bronnert | Process of producing solutions of cellulose. |
| US908754A (en) * | 1906-10-18 | 1909-01-05 | Emile Crumiere | Process for the production of cellulose solutions. |
| US1279200A (en) * | 1915-01-22 | 1918-09-17 | Viscose Co | Manufacture of cellulose compounds. |
| FR37432E (en) * | 1929-09-12 | 1930-12-15 | Switching Device Improvements | |
| US2289085A (en) * | 1937-02-18 | 1942-07-07 | American Enka Corp | Manufacture of artificial products |
| US2322427A (en) * | 1941-08-19 | 1943-06-22 | Edelstein Sidney Milton | Cellulose product |
| US2368527A (en) * | 1942-09-10 | 1945-01-30 | Sidney M Edelstein | Treatment of cellulosic pulp |
-
1946
- 1946-09-30 US US700354A patent/US2444022A/en not_active Expired - Lifetime
Patent Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE118836C (en) * | ||||
| US646799A (en) * | 1899-10-26 | 1900-04-03 | Emile Bronnert | Process of producing solutions of cellulose. |
| US908754A (en) * | 1906-10-18 | 1909-01-05 | Emile Crumiere | Process for the production of cellulose solutions. |
| US1279200A (en) * | 1915-01-22 | 1918-09-17 | Viscose Co | Manufacture of cellulose compounds. |
| FR37432E (en) * | 1929-09-12 | 1930-12-15 | Switching Device Improvements | |
| US2289085A (en) * | 1937-02-18 | 1942-07-07 | American Enka Corp | Manufacture of artificial products |
| US2322427A (en) * | 1941-08-19 | 1943-06-22 | Edelstein Sidney Milton | Cellulose product |
| US2368527A (en) * | 1942-09-10 | 1945-01-30 | Sidney M Edelstein | Treatment of cellulosic pulp |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US2887398A (en) * | 1953-09-08 | 1959-05-19 | Leslie L Balassa | Composition of cellulose and an alkali biuret metal complex |
| US2724632A (en) * | 1954-08-09 | 1955-11-22 | Londat Aetz Fabric Co | Cyanoethylated cellulose textiles modified with chromic and periodic acids and process of making same |
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