US3182107A - Method of producing all-skin viscose rayon - Google Patents
Method of producing all-skin viscose rayon Download PDFInfo
- Publication number
- US3182107A US3182107A US628977A US62897756A US3182107A US 3182107 A US3182107 A US 3182107A US 628977 A US628977 A US 628977A US 62897756 A US62897756 A US 62897756A US 3182107 A US3182107 A US 3182107A
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- United States
- Prior art keywords
- percent
- viscose
- skin
- cellulose
- filaments
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Classifications
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- 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
Definitions
- This invention relates to the production of shaped bodies of regenerated cellulose from viscose and more particularly to filaments and fibers of regenerated cellulose from viscose.
- a suitable cellulosic material such as purified cotton linters, wood pulp, mixtures thereof, and the like is first converted to an alkali cellulose by treatment with a caustic soda solution and after shredding the treated cellulose material, it is allowed to age.
- the aged alkali cellulose is then converted to a xanthate by treatment with carbon disulfide.
- the cellulose xanthate is subsequently dissolved in a caustic soda solution in an amount calculated to provide a viscose of the desired cellulose and alkali content.
- the viscose solution is allowed to ripen and is subsequently extruded through a shaped orifice into a suitable coagulating and regenerating bath.
- the viscose solution is extruded through a spinneret into a coagulating and regenerating bath consisting of an aqueous acid solution containing zinc sulfate.
- the filament may subsequently be passed through a hot aqueous bath where it is stretched to improve its properties such as tensile strength.
- the filament may then be passed through a dilute aqueous solution of sulfuric acid and sodium sulfate to complete the regeneration of the cellulose, in case it is not completely regenerated upon leaving the stretching stage.
- the filament is subsequently subjected to washing, purification, bleaching, possibly other treating operations and drying, being collected either before or after these treatments.
- the filaments as formed by the conventional methods consist of a skin or outer shell portion and a core portion with a sharp line of demarkation between the two.
- the cross section of the filaments exhibits a very irregular or crenulated exterior surface when even small amounts of zinc salts or certain other polyvalent metal salts are present in the spinning bath.
- the skin and core portions of the filament represent differences in structure and these different portions possess different swelling and staining characteristics, the latter permitting a ready identification of skin and core.
- the sharply irregular and crenulated surface structure has a relatively low abrasion resistance and readily picks up foreign particles such as dirt.
- the core portion possesses a relatively high tensiie strength, it has a low abrasion resistance and a low ii'bx-life, is subject to fibrillation and is relatively stiff.
- This invention contemplates the use of such compounds as are formed by the polymerization of an alkylene oxide such as, for example, ethylene oxide and propylene oxide. It is obvious that for all practical purposes considering cost, ease of preparation, commercial availability and solubility in water and alkali solutions such as a 6 percent caustic solution, the polymerized ethylene oxide compounds are preferred. As is well known, the substances as normally prepared are not pure compounds but consist of a group of polymers of different molecular weight. Accordingly, the invention will be illustrated by reference to the polyoxyethylene glycols.
- an alkylene oxide such as, for example, ethylene oxide and propylene oxide.
- substantially all-skin products requires that certain minimum amounts of the polyoxyalkylene glycol be in solution in the viscose. .
- the maximum average molecular weight of the polyoxyalkylene glycol permissible, therefore, is that which is sufficiently soluble in caustic solutions whereby the required amount of the modifier can be dissolved in the viscose.
- the modifier may be conveniently added to the viscose in the form of a solution in alkali or in water.
- polyoxyethylene glycols which are satisfactory may have average molecular weights of between about 400 and about 8000, the preferred materials having average molecular weights of from about 600 to about 6000.
- the amount of the polyoxyalkylene glycol which is incorporated in viscose mustbe at least about 0.5 percent by weight of the cellulose in the viscose and may vary up to about 9 percent, preferably, the amount varies from 1 percent to 6 percent. Lesser amounts do not result in the production of products consisting entirely of skin and greater amounts affect adversely the physical properties of the products. Amounts within the preferred range are most effective in enhancing the characteristics and properties of the products.
- the polyoxyalkylene glycol may be added at any one of the stages in the production of the viscose suchas in the preparation of the refined wood pulp for the manufacture of viscose, before or during the shredding of the alkali cellulose, to the xanthated cellulose while it is being dissolved in the caustic solution or to the viscose solution before or after filtration.
- the polyoxyalkylene glycol is preferably added after the cellulose xanthate has been dissolved in the caustic solution and prior to filtration.
- the viscose may contain from about 4 percent to about 10 percent cellulose, the particular source of the cellulose being selected for the ultimate use of the regenerated cellulose product.
- the caustic soda content may be from about 4 percent to about 11 percent and the carbon disulfide content may be from about 32 percent to about 60 percent based upon the weight of the cellulose.
- the modified viscose that is, a viscose containing a small amount of the ether adduct, should have a salt test num ber above about 7 and preferably about 8.0 or higher at the time of spinning or extrusion.
- the salt test is an indication of both the amount of carbon disulfide added to the viscose and the degree of aging.
- the salt test number is the minimum percent concentration of sodium chloride solution at 18 C. required to coagulate 3 drops of viscose. It is determined by dropping the viscose into a beaker containing about 40 cc. of sodium chloride solution at 18 C; while stirring. Stirring is continued for seconds after the last drop of viscose has been added.
- the carbon disulfide added in preparing the viscose should be at least 32 percent, based on the bone dry cellulose content, and preferably in the order of 35 percent to 50 percent.
- the spinning bath used in the practice of the present invention is a low acid-high zinc spinning bath.
- the bath should contain from about 10 percent to about 25 percent sodium sulfate and from about 4 percent to about 15 percent zinc sulfate, preferably from 15 percent to 22 per-cent sodium sulfate and from 5 to 12 percent zinc sulfate.
- Other metal sulfates such as iron, manganese, nickel and the like may be present and may replace some of the zinc sulfate.
- the temperature of the spinning bath may vary from about 25 C. to about 80 C., though at the lower temperatures the higher concentrations of sodium sulfate cannot be used because of the difficulty of solubility. However, at the preferred temperatures of between about 40 C.
- the temperature of the spinning bath is not critical. However, as is well known in the conventional practice in the art, certain of the physical properties such as tensile strength are afiected by the temperature of the spinning bath. Thus, in the production of filaments for tire cord purposes in accordance with the method of this invention, the spinning bath is preferably maintained at a temperature between about 40 C. and 65 C. so as to obtain the desired high tensile strength.
- the acid content of the spinning bath is balanced against the composition of the viscose.
- the lower limit of the acid concentration is just above the slubbing point, that is, the concentration at which small slubs of uncoagulated viscose appear in the strand as it leaves the spinning bath.
- the carbon disulfide content of the viscose should preferably be at least 35 percent based on the dry cellulose.
- the acid content of the spinning bath should preferably generally not exceed about 9% while the zinc sulfate is preferably maintained within the range of 5 percent to 12 percent.
- the acid concentration of the hath not exceed 9 percent all-skin products will be obtained at higher acid concentrations up to as high as 12 percent if the carbon disulfide content of the viscose is sufficiently increased and the zinc sulfate of the spinning bath is not appreciably below 8.0 percent.
- increasing the amount of additive Within the range specified, also permits, to some degree, the use of higher acid concentrations in the spinning bath.
- the term slubbing point will be used.
- This lower acid concentration is readily determined by those skilled in the art through observance of the fibers as formed and has no particular effecton the production of high-skin or all-skin products in practicing the present invention.
- the lower limit of sulfuric acid required in order to give sufiicient coagulation for spinning is about 6 percent.
- Another Way of stating this is that an acid concentration of about 6 percent is slightly above the slubbing point. It is apparent that for viscose with higher caustic content a slightly higher acid concentration would be required due to the partial neutralizing effect of the increased caustic.
- the acid concentration may be increased as the amount of additive is increased and also as the salt test of the viscose is increased. There is an upper limit, however, for the acid concentration based upon the amount of modifier and the concentration of caustic in the viscose. All-skin products cannot be obtained if the acid content of the bath is increased above the maximum value even though the amount of added modifier is increased to as much as 9 percent while other conditions are maintained constant.
- the maximum permissible acid content of the bath is approximately 0.25 times the carbon disulfide of the viscose as based on the dry cellulose and is preferably maintained between about 0.20 and 0.22 times the carbon disulfide content of the viscose. It is also generally preferred that the acid content of the spinning bath not exceed about 1.35 times the caustic soda content of the viscose.
- the presence of the polyoxyalkylene glycols in the viscose retards the coagulation and, therefore, the amount of the glycol employed must be reduced at high spinning speeds.
- the adduct is employed in amounts within the lower-portion of the range, for example, about 1 percent.
- the extruded viscose must, of course, be immersed or maintained in the spinning bath for a period sufficient to effect relatively complete coagulation of the viscose, that is, the coagulation must be sufficient so that the filaments will not adhere to each other as they are brought together and withdrawn from the bath.
- the filaments are preferably stretched after removal from the initial coagulating and regenerating bath.
- the filaments maybe passed through a 'hot aqueous bath which may consist of hot Water or a dilute acid solution and may be stretched from about 70 percent to about v 110 percent, preferably between 85 percent and 100 percent.
- Yarns for other textile purposes may be stretched as low as 20 percent. The precise amount of stretching will be dependent upon the desired tenacity and other properties and the specific type of product being produced. It is to be understood that the invention is not restricted to the production of filaments and yarns but it is also applicable to other shaped bodies such as sheets, films, tubes and the like.
- the filaments may then be passed through a final regenerating bath which may contain from about 1 percent to about 5 percent sulfuric acid and from about 1 percent to about 5 percent sodium sulfate with or without small amounts of zinc sulfate if regeneration has not previously been completed.
- the treatment following the final regenerating bath, or the stretching operation where regeneration has been n completed may consist of a washing step, a desulfurizing step, the application of a finishing or plastic-izing material and drying before or after collecting, or may include other desired and conventional steps such as bleaching and the like.
- the treatment after regeneration will be dictated by the specific type of shaped body and the proposed use thereof.
- Regenerated cellulose filaments prepared from viscose containing the small amounts of the alkali-soluble polyoxyalkylene glycols and spun in the spinning baths of limited acid content have a smooth or non-crenulated surface and consist substantially entirely of skin. Because of the uniformity of structure throughout the filament, the swelling and staining characteristics are uniform throughout the cross section of the filament. Filaments produced pursuant to this invention and consisting entirely of skin have a high toughness and a greater flexing life than filaments as produced according to prior methods which may be attributed by the uniformity in skin structure through the filament. Although the twisting of conventional filaments, as in the production of tire cord, results in an appreciable loss of tensile strength,
- Filaments prepared from viscose con- 7 taining the polyoxyalkylene glycols have a high tensile preparation of regenerated cellulose filaments from a viscose containing about 7 percent cellulose, about 6 percent caustic soda, and having a total carbon disulfide content of about 41 percent based on the weight of the cellulose.
- the viscose solutions were prepared by xanthating alkali cellulose by the introduction of 36 percent carbon disulfide, based on the Weight of the cellulose and churning for about 2 /2 hours.
- the cellulose Xanthate was then dissolved in caustic soda solution. An additional 5 percent carbon disulfide was then added to the mixer and the mass mixed for about one hour. The polyoxyethylene glycol was added to the caustic soda solution and mixed for about /2 hour. The viscose was then allowed to ripen for about 30 hours at 18 C.
- Example I Approximately 1 percent (based on the weight of the cellulose) of polyethylene glycol 600 was added to and incorporated in the viscose as described above.
- the viscose employed in the spinning of filaments had a salt test of 11.
- the viscose was extruded through a spinneret to form a 200 denier, 120 filament yarn at a rate of about 22 meters per minute.
- the coagulating and regenerating bath was maintained at a temperature of about 60 C. and contained 7 percent sulfuric acid, 8 percent zinc sulfate and 20 percent sodium sulfate.
- the yarn was passed over a godet from which it was conducted through a hot water bath maintained at about 95 C. During the travel through the hot water bath, the yarn was stretched approximately 82 percent. The yarn was then collected in a spinning box, washed free of acid and salts and dried.
- the individual filaments have a smooth, non-crenulated exterior surface and consist entirely of skin, no core being detectable at high magnification (e.g. 1500).
- the filaments of a control yarn spun with the same viscose but without the addition of the polyoxyethylene glycol and spun under the same conditions exhibit a very irregular and serrated surface and are composed of about 84 percent skin and the balance core with a sharp line of demarkation between the skin and core.
- certain other physical properties are about the same as those of the control yarn.
- Example I To a viscose solution as described above, there was added 2 percent of a polyoxyethylene glycol having an average molecular weight of about 1000.
- the viscose had a salt test of 11.5 and was spun into a 200 denier, 120 filament yarn by extrusion into a bath containing 7.7 percent sulfuric acid, 8 percent zinc sulfate and 19 percent sodium sulfa-te.
- the bath was maintained at a temperature of 60 C.
- the extrusion rate was about 22 meters per minute.
- the water bath was maintained at about 95 C. and the filaments were stretched approximately 82 percent while passing through the hot water.
- the yarn was collected in a spinning box, washed free of acid and salts and dried.
- control filaments were readily distinguishable from control filaments prepared from viscose containing no modifier in that they have a smooth, non-crenulated surface and'consist entirely of skin.
- Control filaments have a very irregular and serrated surface and consist of about 84 percent skin and the balance core with a sharp line of demarkation between the skin and core.
- the yarn prepared from the viscose containing the modifier had enhanced physical properties as will appear from the table which follows Example IV.
- Example llI a salt test of 10.8 and was spun into a 200 denier
- filament yarn by extrusion into a bath containing 7.4 percent sulfuric acid, 9 percent zinc sulfate and 20 percent sodium sulfate.
- the bath was maintained at a temperature of 60 C.
- the extrusion rate was about 22 meters per minute.
- the water bath was'maintained at a temperature of 95 C. and the filaments were stretched 82 percent while passing through the hot water.
- the yarn was collected in a spinning box, washed free of acid and salts and dried.
- the individual filaments had a smooth, non-crenulated surface and consist entirely of skin while control filaments have a very irregular and serrated surface and consist of 84 percent skin and the balance core with a sharp line of demarkation between the skin and the core.
- the yarn prepared from viscose containing the modifier had enhanced physical properties as will appear from the table which follows Example IV.
- Example IV As a control to serve as a comparison for the foregoing example, a viscose solution as described above and having a salt test of 10.8 was spun into a 200 denier, 120 filament yarn.
- the spinning bath contained 8 percent sulfuric acid, 9 percent z inc sulfate and 21 percent sodium sulfate, the bath being maintained at a temperature of 60 C. The extrusion rate was about 22 meters per minute.
- the water bath was maintained at a temperature of 95 C. and the filaments were stretched 82 percent while passing through the hot water bath.
- the yarn was collected in a spinning box, washed free of acid and salts and dried.
- the individual filaments have a very irregular and serrated surface and consist of about 84 percent skin and the balance core with a sharp line of demarkation between the skin and the core.
- the presence of small amounts of polyoxyalkylene glycols in the viscose in all instances produces filaments composed of all skin providing the amount of the polyoxyalkylene glycol and the composition of the spinning bath lie within the limits as hereinbefore set forth. It will be noted from the table which follows that certain other of the physical characteristics may be substantially the same as those of viscose containing no polyoxyalkylene glycol. However, the physical properties are improved when the higher amounts of polyoxyalkylene glycol are added to the viscose and other advantages are obtained throughout the range because of the all-skin structure of the filaments.
- polyoxyalkylene glycols may be added to the spinning bath. Since the substances are also water-soluble, some of the modifier will be leached from the filament and will be present in the bath.
- the modifier of this invention may be added to any desired viscose such as those normally used in industry, the specific viscose composition set forth above, being merely for illustrative purposes.
- the polyoxyethylene glycol may be added at any desired stage in the production of the viscose and may be present in the cellulosic raw material provided that the amount present will produce a viscose having the proper proportion of the glycol at the time of spinning.
- the term skin is employed to designate that portion of regenerated cellulose filaments which is permanently stained or dyed by the following procedure: A microtome section-of one or more of the filaments mounted in a wax block is taken and mounted on a slide with Meyer's albumin fixative. After dewaxing in xylene, the section is placed in successive baths of 60 percent and 30 percent alcohol for a few moments each, and it is then stained in 2 percent aqueous solution of Victoria Blue BS conc. (General Dyestuffs Corp.) for 1 to 2 hours. At this point, the entire section is blue.
- Victoria Blue BS conc. General Dyestuffs Corp.
- the dye By rinsing the section first in distilled water and then in one or more baths composed of 10 percent water and percent di- Oxane for a period varying from 5 to 30 minutes depending on the particular filament, the dye is entirely removed from the core, leaving it restricted to the skin areas.
- a viscose having a salt index of at least 8 extruding a viscose having a salt index of at least 8 and containing from about 4 percent to 10 percent cellulose, from about 4 percent to 11 percent caustic soda, from about 35 percent to 50 percent carbon disulfide, based on the weight of the cellulose, and from about 1 percent to 6 percent based on the cellulose of a dissolved polyoxyalkylene glycol into an aqueous spinning bath containing from about 10 percent to 25 percent sodium sulfate, from about 5 percent to 12 percent zinc sulfate and sulfuric acid, the sulfuric acid content of the spinning bath exceeding the slubbing point but not exceeding about 9 percent, removing the body from the spinning bath, washing the body and drying the body.
- the method of producing shaped bodies of regenerated cellulose consisting substantially entirely of skin which comprises adding to and incorporating in a viscose from about 1 percent to 6 percent, based on the weight of the cellulose in said viscose, of a dissolved polyoxyalkylene glycol, the viscose containing about 7 percent cellulose, about 6 percent caustic soda and about 41 percent carbon disulfide, said percent carbon disulfide based upon, the Weight of the cellulose, ripening the viscose to a salt point of not less than about 9 and extruding the viscose into an aqueous spinning bath containing from about 16 percent to 20 percent sodium sulfate, from about 4 percent to 12 percent zinc sulfate and sulfuric acid, the sulfuric acid content of the spinning bath exceeding the slubbing point but not exceeding about 9 percent.
- polyoxyalkylene glycol is polyoxyethylene glycol having an average molecular weight of between about 600 and 6000.
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Description
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Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
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US628977A US3182107A (en) | 1956-12-18 | 1956-12-18 | Method of producing all-skin viscose rayon |
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US628977A US3182107A (en) | 1956-12-18 | 1956-12-18 | Method of producing all-skin viscose rayon |
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US3182107A true US3182107A (en) | 1965-05-04 |
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US628977A Expired - Lifetime US3182107A (en) | 1956-12-18 | 1956-12-18 | Method of producing all-skin viscose rayon |
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Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3506754A (en) * | 1967-09-27 | 1970-04-14 | Tachikawa Res Inst | Process for manufacturing rayon having high degree of polymerization by the viscose process |
US3619223A (en) * | 1965-06-14 | 1971-11-09 | Beaunit Corp | Process of spinning viscose |
US4548647A (en) * | 1983-05-05 | 1985-10-22 | Berol Kemi Ab | Method for improving the filterability of a viscose solution |
Citations (13)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
FR828686A (en) * | 1937-06-28 | 1938-05-25 | Steckborn Soie Artificielle S | Process for the production of artificial silk threads composed of individual glossy and matt viscose fibers |
US2362217A (en) * | 1943-01-13 | 1944-11-07 | Rayonier Inc | Production of cellulosic products |
US2393817A (en) * | 1942-10-19 | 1946-01-29 | Rayonier Inc | Production of cellulosic products |
GB575218A (en) * | 1944-03-07 | 1946-02-08 | Harry Lloyd | An improved machine for the electric detonation of explosive charges |
US2397338A (en) * | 1943-10-12 | 1946-03-26 | American Viscose Corp | Manufacture of filaments and fibers |
US2535044A (en) * | 1947-04-26 | 1950-12-26 | Du Pont | Spinning of viscose |
US2664360A (en) * | 1951-08-20 | 1953-12-29 | Int Paper Canada | Manufacture of cellulose |
US2696423A (en) * | 1951-05-29 | 1954-12-07 | Du Pont | Viscose modifiers |
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 |
US2805169A (en) * | 1955-07-18 | 1957-09-03 | Rayonier Inc | High-alpha cellulose |
US2814569A (en) * | 1952-05-24 | 1957-11-26 | Rayonier Inc | High-alpha cellulose pulp |
US2852333A (en) * | 1954-05-21 | 1958-09-16 | Du Pont | Viscose spinning process |
US2895788A (en) * | 1954-12-30 | 1959-07-21 | American Viscose Corp | Method of forming all skin viscose rayon |
-
1956
- 1956-12-18 US US628977A patent/US3182107A/en not_active Expired - Lifetime
Patent Citations (13)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
FR828686A (en) * | 1937-06-28 | 1938-05-25 | Steckborn Soie Artificielle S | Process for the production of artificial silk threads composed of individual glossy and matt viscose fibers |
US2393817A (en) * | 1942-10-19 | 1946-01-29 | Rayonier Inc | Production of cellulosic products |
US2362217A (en) * | 1943-01-13 | 1944-11-07 | Rayonier Inc | Production of cellulosic products |
US2397338A (en) * | 1943-10-12 | 1946-03-26 | American Viscose Corp | Manufacture of filaments and fibers |
GB575218A (en) * | 1944-03-07 | 1946-02-08 | Harry Lloyd | An improved machine for the electric detonation of explosive charges |
US2535044A (en) * | 1947-04-26 | 1950-12-26 | Du Pont | Spinning of viscose |
US2696423A (en) * | 1951-05-29 | 1954-12-07 | Du Pont | Viscose modifiers |
US2664360A (en) * | 1951-08-20 | 1953-12-29 | Int Paper Canada | Manufacture of cellulose |
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 |
US2814569A (en) * | 1952-05-24 | 1957-11-26 | Rayonier Inc | High-alpha cellulose pulp |
US2852333A (en) * | 1954-05-21 | 1958-09-16 | Du Pont | Viscose spinning process |
US2895788A (en) * | 1954-12-30 | 1959-07-21 | American Viscose Corp | Method of forming all skin viscose rayon |
US2805169A (en) * | 1955-07-18 | 1957-09-03 | Rayonier Inc | High-alpha cellulose |
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3619223A (en) * | 1965-06-14 | 1971-11-09 | Beaunit Corp | Process of spinning viscose |
US3506754A (en) * | 1967-09-27 | 1970-04-14 | Tachikawa Res Inst | Process for manufacturing rayon having high degree of polymerization by the viscose process |
US4548647A (en) * | 1983-05-05 | 1985-10-22 | Berol Kemi Ab | Method for improving the filterability of a viscose solution |
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Owner name: WESTERN AND SOUTHERN LIFE INSURANCE COMPANY THE C/ Free format text: AS SECURITY FOR INDEBTEDNESS RECITED ASSIGNOR GRANTS , BARGAINS, MORTGAGES, PLEDGES, SELLS AND CREATES A SECURITY INTEREST WITH A LIEN UNDER SAID PATENTS, SUBJECT TO CONDITIONS RECITED.;ASSIGNOR:AVTEX FIBERS INC. A NY CORP.;REEL/FRAME:003959/0219 Effective date: 19810301 Owner name: WALTER E. HELLER & COMPANY, INC., A CORP. OF DEL. Free format text: AGREEMENT WHEREBY AETNA RELEASES AVTEX FROM ALL MORTAGES AND SECURITY INTERESTS IN SAID INVENTIONS AS OF JANUARY 11,1979, AND ASSIGNS TO ASSIGNEE THE ENTIRE INTEREST IN SAID MORTAGE AGREEMENT TO ASSIGNEE;ASSIGNORS:AETNA BUSINESS CREDIT, INC., A CORP. OF N.Y.;AVTEX FIBERS, INC, A CORP. OF NY;KELLOGG CREDIT CORP., A CORP. OF DEL.;REEL/FRAME:003959/0250 Effective date: 19800326 Owner name: NEW ENGLAND MUTUAL LIFE INSURANCE COMPANY 501 BOYL Free format text: AS SECURITY FOR INDEBTEDNESS RECITED ASSIGNOR GRANTS , BARGAINS, MORTGAGES, PLEDGES, SELLS AND CREATES A SECURITY INTEREST WITH A LIEN UNDER SAID PATENTS, SUBJECT TO CONDITIONS RECITED.;ASSIGNOR:AVTEX FIBERS INC. A NY CORP.;REEL/FRAME:003959/0219 Effective date: 19810301 Owner name: KELLOGG CREDIT CORPORATION A DE CORP. Free format text: AGREEMENT WHEREBY SAID HELLER AND RAYONIER RELEASES ALL MORTGAGES AND SECURITY INTERESTS HELD BY AVTEX ON APRIL 28, 1978, AND JAN. 11, 1979, RESPECTIVELY AND ASSIGNS ITS ENTIRE INTEREST IN SAID MORT-AGAGE AGREEMENT TO ASSIGNEE;ASSIGNORS:WALTER E. HELLER & COMPANY, INC. A NY CORP.;ITT RAYONIER INCORPORATED, A DE CORP.;AVTEX FIBERS INC., A NY CORP.;REEL/FRAME:003959/0350 Effective date: 19800326 Owner name: JOHN HANCOCK MUTUAL LIFE INSURANCE COMPANY JOHN HA Free format text: AS SECURITY FOR INDEBTEDNESS RECITED ASSIGNOR GRANTS , BARGAINS, MORTGAGES, PLEDGES, SELLS AND CREATES A SECURITY INTEREST WITH A LIEN UNDER SAID PATENTS, SUBJECT TO CONDITIONS RECITED.;ASSIGNOR:AVTEX FIBERS INC. A NY CORP.;REEL/FRAME:003959/0219 Effective date: 19810301 Owner name: PAUL REVERE LIFE INSURANCE COMPANY THE C/O THE PAU Free format text: AS SECURITY FOR INDEBTEDNESS RECITED ASSIGNOR GRANTS , BARGAINS, MORTGAGES, PLEDGES, SELLS AND CREATES A SECURITY INTEREST WITH A LIEN UNDER SAID PATENTS, SUBJECT TO CONDITIONS RECITED.;ASSIGNOR:AVTEX FIBERS INC. A NY CORP.;REEL/FRAME:003959/0219 Effective date: 19810301 Owner name: BALBOA INSURANCE COMPANY C/O THE PAUL REVERE EQUIT Free format text: AS SECURITY FOR INDEBTEDNESS RECITED ASSIGNOR GRANTS , BARGAINS, MORTGAGES, PLEDGES, SELLS AND CREATES A SECURITY INTEREST WITH A LIEN UNDER SAID PATENTS, SUBJECT TO CONDITIONS RECITED.;ASSIGNOR:AVTEX FIBERS INC. A NY CORP.;REEL/FRAME:003959/0219 Effective date: 19810301 Owner name: PROVIDENT ALLIANCE LIFE INSURANCE COMPANY C/O THE Free format text: AS SECURITY FOR INDEBTEDNESS RECITED ASSIGNOR GRANTS , BARGAINS, MORTGAGES, PLEDGES, SELLS AND CREATES A SECURITY INTEREST WITH A LIEN UNDER SAID PATENTS, SUBJECT TO CONDITIONS RECITED.;ASSIGNOR:AVTEX FIBERS INC. A NY CORP.;REEL/FRAME:003959/0219 Effective date: 19810301 |