US2206946A - Manufacture and treatment of organic materials comprising organic esters - Google Patents
Manufacture and treatment of organic materials comprising organic esters Download PDFInfo
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- US2206946A US2206946A US184801A US18480138A US2206946A US 2206946 A US2206946 A US 2206946A US 184801 A US184801 A US 184801A US 18480138 A US18480138 A US 18480138A US 2206946 A US2206946 A US 2206946A
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- Prior art keywords
- salts
- materials
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- acid
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- 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.)
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- 238000004519 manufacturing process Methods 0.000 title description 13
- 150000002895 organic esters Chemical class 0.000 title description 12
- 239000011368 organic material Substances 0.000 title 1
- 150000003839 salts Chemical class 0.000 description 38
- 239000000463 material Substances 0.000 description 22
- 239000002253 acid Substances 0.000 description 17
- 238000007127 saponification reaction Methods 0.000 description 13
- 229920002678 cellulose Polymers 0.000 description 12
- 239000001913 cellulose Substances 0.000 description 12
- 238000000034 method Methods 0.000 description 12
- 239000004744 fabric Substances 0.000 description 11
- 239000012237 artificial material Substances 0.000 description 10
- 229910052783 alkali metal Inorganic materials 0.000 description 9
- 230000007062 hydrolysis Effects 0.000 description 9
- 238000006460 hydrolysis reaction Methods 0.000 description 9
- 239000001488 sodium phosphate Substances 0.000 description 9
- 239000012736 aqueous medium Substances 0.000 description 8
- 229910000406 trisodium phosphate Inorganic materials 0.000 description 8
- 235000019801 trisodium phosphate Nutrition 0.000 description 8
- 150000001340 alkali metals Chemical class 0.000 description 7
- RYFMWSXOAZQYPI-UHFFFAOYSA-K trisodium phosphate Chemical compound [Na+].[Na+].[Na+].[O-]P([O-])([O-])=O RYFMWSXOAZQYPI-UHFFFAOYSA-K 0.000 description 7
- 229920002301 cellulose acetate Polymers 0.000 description 6
- 150000007519 polyprotic acids Polymers 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
- BNIILDVGGAEEIG-UHFFFAOYSA-L disodium hydrogen phosphate Chemical compound [Na+].[Na+].OP([O-])([O-])=O BNIILDVGGAEEIG-UHFFFAOYSA-L 0.000 description 4
- 229910052708 sodium Inorganic materials 0.000 description 4
- LWIHDJKSTIGBAC-UHFFFAOYSA-K tripotassium phosphate Chemical compound [K+].[K+].[K+].[O-]P([O-])([O-])=O LWIHDJKSTIGBAC-UHFFFAOYSA-K 0.000 description 4
- 125000000218 acetic acid group Chemical group C(C)(=O)* 0.000 description 3
- -1 ribbons Substances 0.000 description 3
- 239000011734 sodium Substances 0.000 description 3
- CDBYLPFSWZWCQE-UHFFFAOYSA-L sodium carbonate Substances [Na+].[Na+].[O-]C([O-])=O CDBYLPFSWZWCQE-UHFFFAOYSA-L 0.000 description 3
- OYPRJOBELJOOCE-UHFFFAOYSA-N Calcium Chemical compound [Ca] OYPRJOBELJOOCE-UHFFFAOYSA-N 0.000 description 2
- NBIIXXVUZAFLBC-UHFFFAOYSA-N Phosphoric acid Chemical compound OP(O)(O)=O NBIIXXVUZAFLBC-UHFFFAOYSA-N 0.000 description 2
- ZLMJMSJWJFRBEC-UHFFFAOYSA-N Potassium Chemical compound [K] ZLMJMSJWJFRBEC-UHFFFAOYSA-N 0.000 description 2
- UIIMBOGNXHQVGW-UHFFFAOYSA-M Sodium bicarbonate Chemical compound [Na+].OC([O-])=O UIIMBOGNXHQVGW-UHFFFAOYSA-M 0.000 description 2
- 229910052791 calcium Inorganic materials 0.000 description 2
- 239000011575 calcium Substances 0.000 description 2
- BVKZGUZCCUSVTD-UHFFFAOYSA-N carbonic acid Chemical compound OC(O)=O BVKZGUZCCUSVTD-UHFFFAOYSA-N 0.000 description 2
- 239000003795 chemical substances by application Substances 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 150000002148 esters Chemical class 0.000 description 2
- 239000000203 mixture Substances 0.000 description 2
- 229910052700 potassium Inorganic materials 0.000 description 2
- 239000011591 potassium Substances 0.000 description 2
- BWHMMNNQKKPAPP-UHFFFAOYSA-L potassium carbonate Substances [K+].[K+].[O-]C([O-])=O BWHMMNNQKKPAPP-UHFFFAOYSA-L 0.000 description 2
- 229910000160 potassium phosphate Inorganic materials 0.000 description 2
- 235000011009 potassium phosphates Nutrition 0.000 description 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 2
- QTBSBXVTEAMEQO-UHFFFAOYSA-M Acetate Chemical compound CC([O-])=O QTBSBXVTEAMEQO-UHFFFAOYSA-M 0.000 description 1
- BVKZGUZCCUSVTD-UHFFFAOYSA-M Bicarbonate Chemical class OC([O-])=O BVKZGUZCCUSVTD-UHFFFAOYSA-M 0.000 description 1
- FERIUCNNQQJTOY-UHFFFAOYSA-M Butyrate Chemical compound CCCC([O-])=O FERIUCNNQQJTOY-UHFFFAOYSA-M 0.000 description 1
- FERIUCNNQQJTOY-UHFFFAOYSA-N Butyric acid Natural products CCCC(O)=O FERIUCNNQQJTOY-UHFFFAOYSA-N 0.000 description 1
- 229920000742 Cotton Polymers 0.000 description 1
- QXNVGIXVLWOKEQ-UHFFFAOYSA-N Disodium Chemical compound [Na][Na] QXNVGIXVLWOKEQ-UHFFFAOYSA-N 0.000 description 1
- 239000001856 Ethyl cellulose Substances 0.000 description 1
- ZZSNKZQZMQGXPY-UHFFFAOYSA-N Ethyl cellulose Chemical compound CCOCC1OC(OC)C(OCC)C(OCC)C1OC1C(O)C(O)C(OC)C(CO)O1 ZZSNKZQZMQGXPY-UHFFFAOYSA-N 0.000 description 1
- BDAGIHXWWSANSR-UHFFFAOYSA-M Formate Chemical compound [O-]C=O BDAGIHXWWSANSR-UHFFFAOYSA-M 0.000 description 1
- 229910019142 PO4 Inorganic materials 0.000 description 1
- NBIIXXVUZAFLBC-UHFFFAOYSA-L Phosphate ion(2-) Chemical compound OP([O-])([O-])=O NBIIXXVUZAFLBC-UHFFFAOYSA-L 0.000 description 1
- XBDQKXXYIPTUBI-UHFFFAOYSA-M Propionate Chemical compound CCC([O-])=O XBDQKXXYIPTUBI-UHFFFAOYSA-M 0.000 description 1
- GPFIZJURHXINSQ-UHFFFAOYSA-N acetic acid;nitric acid Chemical compound CC(O)=O.O[N+]([O-])=O GPFIZJURHXINSQ-UHFFFAOYSA-N 0.000 description 1
- AVMNFQHJOOYCAP-UHFFFAOYSA-N acetic acid;propanoic acid Chemical compound CC(O)=O.CCC(O)=O AVMNFQHJOOYCAP-UHFFFAOYSA-N 0.000 description 1
- 229910000147 aluminium phosphate Inorganic materials 0.000 description 1
- 239000007864 aqueous solution Substances 0.000 description 1
- CJDPJFRMHVXWPT-UHFFFAOYSA-N barium sulfide Chemical class [S-2].[Ba+2] CJDPJFRMHVXWPT-UHFFFAOYSA-N 0.000 description 1
- IELPSGPHQCRVQW-UHFFFAOYSA-L barium(2+);sulfanide Chemical class [SH-].[SH-].[Ba+2] IELPSGPHQCRVQW-UHFFFAOYSA-L 0.000 description 1
- 239000002585 base Substances 0.000 description 1
- 159000000007 calcium salts Chemical class 0.000 description 1
- 239000000969 carrier Substances 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 229910000397 disodium phosphate Inorganic materials 0.000 description 1
- 235000019800 disodium phosphate Nutrition 0.000 description 1
- 239000000975 dye Substances 0.000 description 1
- 150000002170 ethers Chemical class 0.000 description 1
- 229920001249 ethyl cellulose Polymers 0.000 description 1
- 235000019325 ethyl cellulose Nutrition 0.000 description 1
- RWSOTUBLDIXVET-UHFFFAOYSA-M hydrosulfide Chemical compound [SH-] RWSOTUBLDIXVET-UHFFFAOYSA-M 0.000 description 1
- FADIYVNKNQZKMK-UHFFFAOYSA-N nitric acid;propanoic acid Chemical compound O[N+]([O-])=O.CCC(O)=O FADIYVNKNQZKMK-UHFFFAOYSA-N 0.000 description 1
- NBIIXXVUZAFLBC-UHFFFAOYSA-K phosphate Chemical compound [O-]P([O-])([O-])=O NBIIXXVUZAFLBC-UHFFFAOYSA-K 0.000 description 1
- 239000010452 phosphate Substances 0.000 description 1
- 235000011181 potassium carbonates Nutrition 0.000 description 1
- 159000000001 potassium salts Chemical class 0.000 description 1
- DPLVEEXVKBWGHE-UHFFFAOYSA-N potassium sulfide Chemical compound [S-2].[K+].[K+] DPLVEEXVKBWGHE-UHFFFAOYSA-N 0.000 description 1
- 235000017557 sodium bicarbonate Nutrition 0.000 description 1
- 229910000030 sodium bicarbonate Inorganic materials 0.000 description 1
- 229910000029 sodium carbonate Inorganic materials 0.000 description 1
- 235000011182 sodium carbonates Nutrition 0.000 description 1
- 238000009987 spinning Methods 0.000 description 1
- 230000008961 swelling Effects 0.000 description 1
- SOBHUZYZLFQYFK-UHFFFAOYSA-K trisodium;hydroxy-[[phosphonatomethyl(phosphonomethyl)amino]methyl]phosphinate Chemical compound [Na+].[Na+].[Na+].OP(O)(=O)CN(CP(O)([O-])=O)CP([O-])([O-])=O SOBHUZYZLFQYFK-UHFFFAOYSA-K 0.000 description 1
- 238000002166 wet spinning Methods 0.000 description 1
Classifications
-
- D—TEXTILES; PAPER
- D06—TREATMENT OF TEXTILES OR THE LIKE; LAUNDERING; FLEXIBLE MATERIALS NOT OTHERWISE PROVIDED FOR
- D06M—TREATMENT, NOT PROVIDED FOR ELSEWHERE IN CLASS D06, OF FIBRES, THREADS, YARNS, FABRICS, FEATHERS OR FIBROUS GOODS MADE FROM SUCH MATERIALS
- D06M11/00—Treating fibres, threads, yarns, fabrics or fibrous goods made from such materials, with inorganic substances or complexes thereof; Such treatment combined with mechanical treatment, e.g. mercerising
- D06M11/32—Treating fibres, threads, yarns, fabrics or fibrous goods made from such materials, with inorganic substances or complexes thereof; Such treatment combined with mechanical treatment, e.g. mercerising with oxygen, ozone, ozonides, oxides, hydroxides or percompounds; Salts derived from anions with an amphoteric element-oxygen bond
- D06M11/36—Treating fibres, threads, yarns, fabrics or fibrous goods made from such materials, with inorganic substances or complexes thereof; Such treatment combined with mechanical treatment, e.g. mercerising with oxygen, ozone, ozonides, oxides, hydroxides or percompounds; Salts derived from anions with an amphoteric element-oxygen bond with oxides, hydroxides or mixed oxides; with salts derived from anions with an amphoteric element-oxygen bond
- D06M11/38—Oxides or hydroxides of elements of Groups 1 or 11 of the Periodic Table
- D06M11/385—Saponification of cellulose-acetate
Definitions
- This invention relates to the saponification of threads, fibres, yarns, fabrics, ribbons, films and like materials having a basis of cellulose acetate or other organic ester of cellulose.
- the bath may be made from mixtures of trisodium or potassium phosphate with disodium or potassium phosphate, of sodium, potassium, calcium or barium sulphides with sodium, potassium, calcium or barium hydrosulphides, or of sodium or potassium carbonates with the corresponding bicarbonates.
- both salts 25 are of alkaline reaction. Salts of alkali metals are particularly suitable.
- the salt of lower acid radicle content predominate considerably in the mixture. It may. for example, conveniently 80 be present to the extent of 5-10 or times the molecular proportion of the salt of higher acid radicle content.
- concentration in which the salts are employed will depend on the nature of the materials treated, the degree of saponiflcation desired and the alkalinity of the salts, i. e..
- the pH value of aqueous solutions of given concentration When treating ordinary cellulose acetate yarn, for example having an acetyl value of between 51 and 54 so as to effect a reduction in the acetyl content of between and the bath may contain an amount of trisodium phosphate ranging from that theoretically required to produce the desired saponification to twice the theoretical amount together with some 8-15% on the weight of the trisodium phosphate of disodium hydrogen phosphate, the bath volume being between :1 and 80:1, e. g., :1 or :1. Similar proportions are suitable when the corresponding potassium salts are used or when sodium carbonate is used in admixture with sodium bicarbonate.
- the concentration should preferably be reduced, i. e., a. bath volume greater than 60:1 should be used.
- concentration should preferably be considerably higher, that is the amount of salts used should be several times that theoretically required and in addition the bath volume may be reduced, for example to 30:1.
- the temperature of the bath may be relatively low, for example below 40 or 50 0., though it is preferable to carry out the saponification at considerably higher temperatures, for example from 60-80 C.
- the saponification may be carried out, on the materials in any suitable form, for example in hank form or wound on to perforated bobbins or other package carriers.
- the materials may be drawn continuously through the saponifying. bath but as .the saponification baths of the invention are necessarilysomewhat slow in action, continuous operation does not in general present advantages over saponification in package form.
- ti The following examples illustrate the inven- Example 1 A bath is made up as described in Example 1, but using the following quantities for each 100 lbs. of yarn:
- the process of the invention is also applicable to other organic esters of cellulose, for example cellulose formate, propionate, butyrate, mixed esters such as cellulose nitrate-acetate, nitrate-propionate, acetate-propionate, acetate-propionatenitrate and ether esters such as ethyl cellulose acetate and oxyethyl cellulose acetate.
- organic esters of cellulose for example cellulose formate, propionate, butyrate, mixed esters such as cellulose nitrate-acetate, nitrate-propionate, acetate-propionate, acetate-propionatenitrate and ether esters such as ethyl cellulose acetate and oxyethyl cellulose acetate.
- the degree of saponification may be sufiicient to reduce the acidyl content of the ester by 15-20% or even' less. It is preferably somewhat higher however, for example sufiicient to reduce the acidyl content by 20-25 or 30%. Considerably higher degrees of saponification may be obtained, sufiicient to remove, for example 35 or 40-50% or even more of the acidyl content of the materials according to the particular purpose in view.
- Process for the production of improved artificial materials which comprises saponifying threads, fibres, yarns, fabrics, ribbons or like materials having a basis of cellulose acetate by treatment in an aqueous bath containing two alkali metal salts of the same weak inorganic polybasic acid, one of said salts containing a higher molecular proportion of acid radicle than the other and the bath being alkaline owing solely to hydrolysis of at least one of said salts.
Landscapes
- Engineering & Computer Science (AREA)
- Textile Engineering (AREA)
- Chemical Or Physical Treatment Of Fibers (AREA)
Description
Patented July 9, 1940 UNITED STATES MANUFACTURE AND TREATMENT OF OR- I GANIC MATERIALS COMPRISING ORGANIC ESTERS Henry Dreyfus, London, England No Drawing. Application January 13, 1938, Se-
rial No. 184,801. 1937 Claims.
This invention relates to the saponification of threads, fibres, yarns, fabrics, ribbons, films and like materials having a basis of cellulose acetate or other organic ester of cellulose.
It is difiicult to effect saponification, and particularly partial saponification of materials of the kind referred to above in such a .way that the products have desirable tensile properties and at the same time can be dyed uniformly with cotton 10 dyes without streakiness or similar defects.
I have now found that the desired results can readily be obtained by treating the materials in an alkaline saponifying bath formed by dissolving in an aqueous medium. two salts of a weak l6 polybasic acid with the same or different strong bases,' said salts containing different molecular proportions of the acid radicle. Thus, for example, the bath may be made from mixtures of trisodium or potassium phosphate with disodium or potassium phosphate, of sodium, potassium, calcium or barium sulphides with sodium, potassium, calcium or barium hydrosulphides, or of sodium or potassium carbonates with the corresponding bicarbonates. Preferably both salts 25 are of alkaline reaction. Salts of alkali metals are particularly suitable.
It is generally of advantage for the salt of lower acid radicle content to predominate considerably in the mixture. It may. for example, conveniently 80 be present to the extent of 5-10 or times the molecular proportion of the salt of higher acid radicle content. The concentration in which the salts are employed will depend on the nature of the materials treated, the degree of saponiflcation desired and the alkalinity of the salts, i. e..
' the pH value of aqueous solutions of given concentration. When treating ordinary cellulose acetate yarn, for example having an acetyl value of between 51 and 54 so as to effect a reduction in the acetyl content of between and the bath may contain an amount of trisodium phosphate ranging from that theoretically required to produce the desired saponification to twice the theoretical amount together with some 8-15% on the weight of the trisodium phosphate of disodium hydrogen phosphate, the bath volume being between :1 and 80:1, e. g., :1 or :1. Similar proportions are suitable when the corresponding potassium salts are used or when sodium carbonate is used in admixture with sodium bicarbonate. When sodium or potassium sulphide is used in conjunction with the corresponding hydrosulphide, the concentration should preferably be reduced, i. e., a. bath volume greater than 60:1 should be used. With the corresponding calcium salts, however, the concentration should preferably be considerably higher, that is the amount of salts used should be several times that theoretically required and in addition the bath volume may be reduced, for example to 30:1.
In Great Britain January 18,
The temperature of the bath may be relatively low, for example below 40 or 50 0., though it is preferable to carry out the saponification at considerably higher temperatures, for example from 60-80 C.
When the process is applied to materials which have been stretched considerably at some stage in their manufacture, for example in the course of a wet spinning operation or of a stretching operation carried out on threads after spinning while they are under the action of an organic swelling agent or of steam or of hot water, it is of advantage to use baths of higher concentration than would be used, other things being equal, in the treatment of ordinary unstretched threads of the same material. If, on the other hand, the threads treated have undergone a shrinking operation after stretching or without their having been stretched, low concentrations of the saponifying agent may be used.
The saponification may be carried out, on the materials in any suitable form, for example in hank form or wound on to perforated bobbins or other package carriers. On the other hand the materials may be drawn continuously through the saponifying. bath but as .the saponification baths of the invention are necessarilysomewhat slow in action, continuous operation does not in general present advantages over saponification in package form. ti The following examples illustrate the inven- Example 1 A bath is made up as described in Example 1, but using the following quantities for each 100 lbs. of yarn:
'irisodium phosphate lbs 100 Dlsodium hydrogen phosphate lbs 15 Water gallons 5800 The yarn is allowed to remain in the bath at -90 C. until 20-30% of the original acetyl 0011-1 tent is removed.
Though the invention has been described with particular reference to cellulose acetate materials, the process of the invention is also applicable to other organic esters of cellulose, for example cellulose formate, propionate, butyrate, mixed esters such as cellulose nitrate-acetate, nitrate-propionate, acetate-propionate, acetate-propionatenitrate and ether esters such as ethyl cellulose acetate and oxyethyl cellulose acetate.
The degree of saponification may be sufiicient to reduce the acidyl content of the ester by 15-20% or even' less. It is preferably somewhat higher however, for example sufiicient to reduce the acidyl content by 20-25 or 30%. Considerably higher degrees of saponification may be obtained, sufiicient to remove, for example 35 or 40-50% or even more of the acidyl content of the materials according to the particular purpose in view.
Having described my invention, what I desire to secure by Letters Patent is:
1. Process for the production of improved artificial materials, which comprises saponifying threads, fibres, yarns, fabrics, ribbons or like materials having a basis of organic ester of cellulose by treatment in an aqueous bath containing two alkali metal salts of the same weak inorganic polybasic acid, one of said salts containing a higher molecular proportion of acid radicle than the other and the bath being alkaline owing solely to hydrolysis of at least one of said salts.
2. Process for the production of improved artificial materials which comprises saponifying threads, fibres, yarns, fabrics, ribbons or like materials having a basis of organic ester of cellulose by treatment in an aqueous bath containing twosalts of the same alkali metal with the same weak inorganic polybasic acid, one of said salts containing a higher molecular proportion of acidradicle than the other and the bath being alkaline owing solely to hydrolysis of at least one of said salts.
3. Process for the production of improved artificial materials which comprises saponifying threads, fibres, yarns, fabrics, ribbons or like materials having a basis'of organic ester of cellulose by treatment in an aqueous bath made by dissolving in an aqueous medium two salts of the same alkali metal with the same weak inorganic polybasic acid, one of said salts containing a higher molecular proportion of acid radicle than the other and the bath being alkaline owing solely to hydrolysis of at least one of said salts,
.the salt containing the lower molecular proportion of acid being present in excess.
4. Process for the production of improved artificial materials which comprises saponifying threads, fibres, yarns, fabrics, ribbons or like materials having a basis of organic ester of cellulose by treatment in an aqueous bath made by dissolving in an aqueous medium two salts of the same alkali metal with the same weak inorganic polybasic acid, one of said salts contain ing a higher molecular proportion of acid radicle than the other and the bath being alkaline owing solely to hydrolysis of at least one of said salts, the salt containing the lower proportion of acid radicle being present in an amount ranging from that theoretically required to produce the desired saponification to twice that amount and the salt containing the lower proportions of acid radicle being present to the extent of 5 to 15 times the molecular proportion of the salt of higher acid radicle content.
the saponification of materials having a basis of 5. Process for the production of improved artificial materials which comprises saponifying threads, fibres, yarns, fabrics, ribbons or like materials having a basis of organic ester of cellulose by treatment in an aqueous hath made by dissolving in an aqueous medium two salts of the same alkali metal with phosphoric acid, one of said salts containing a higher molecular proportion of acid radicle than the other and the bath being alkaline owing solely to hydrolysis of at least one of said salts, the salt containing the lower molecular proportion of acid being present in excess.
6. Process for the production of improved artificial materials which comprises saponifying threads, fibres, yarns, fabrics, ribbons or like materials having a basis of organic ester of cellulose by treatment in an aqueous bath made by dissolving in an aqueous medium two salts of the same alkali metal with carbonic acid, one of said salts containing a higher molecular proportion of acid radicle than the other and the bath being alkaline owing solely to hydrolysis of at least one of said salts, the salt containing the lower molecular proportion of acid being present in excess.
'7. Process for the production of improved artificial materials which comprises saponifying threads, fibres, yarns, fabrics, ribbons or like materials having a basis of organic ester of cellulose by treatment in an aqueous bath made by dissolving in an aqueous medium trisodium phosphate and disodium hydrogen phosphate, the trisodium phosphate being in excess and the bath being alkaline solely owing to hydrolysis of one of the salts.
8. Process for the production of improved artificial materials which comprises saponifying threads, fibres, yarns, fabrics, ribbons or like materials having a basis of organic ester of cellulose by treatment in an aqueous bath made by dissolving in an aqueous medium trisodium phosphate and disodium hydrogen phosphate, the trisodium phosphate being present in an amount ranging from that theoretically required to produce the desired saponification to twice that amount and the trisodium phosphate being present to the extent of 5 to 15 times the molecular proportion of the disodium hydrogen phosphate.
9. Process for the production of improved artificial materials, which comprises saponifying threads, fibres, yarns, fabrics, ribbons or like materials having a basis of cellulose acetate by treatment in an aqueous bath containing two alkali metal salts of the same weak inorganic polybasic acid, one of said salts containing a higher molecular proportion of acid radicle than the other and the bath being alkaline owing solely to hydrolysis of at least one of said salts.
10. Process for the production of improved artificial materials which comprises saponifying threads, fibres, yarns, fabrics. ribbons or like materials having a basis of cellulose acetate by treatment in an aqueous bath made by dissolving in an aqueous medium two salts of the same alkali metal with carbonic acid, one of said salts containing a higher molecular proportion of acid radicle than the other and the bath being alkaline owing solely to hydrolysis of at least one of said salts, the salt containing the lower molecular proportion of acid being present in excess.
HENRY DREYFUS.
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GB2206946X | 1937-01-18 |
Publications (1)
Publication Number | Publication Date |
---|---|
US2206946A true US2206946A (en) | 1940-07-09 |
Family
ID=10901200
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US184801A Expired - Lifetime US2206946A (en) | 1937-01-18 | 1938-01-13 | Manufacture and treatment of organic materials comprising organic esters |
Country Status (1)
Country | Link |
---|---|
US (1) | US2206946A (en) |
-
1938
- 1938-01-13 US US184801A patent/US2206946A/en not_active Expired - Lifetime
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