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
  • D01F2/24—Monocomponent artificial filaments or the like of cellulose or cellulose derivatives; Manufacture thereof from cellulose derivatives
  • D01F2/28—Monocomponent artificial filaments or the like of cellulose or cellulose derivatives; Manufacture thereof from cellulose derivatives from organic cellulose esters or ethers, e.g. cellulose acetate

Definitions

• the swelling medium referred to in British Patent 352,445 as being particularly possessive of the necessary qualities to produce the state of super-plasticity and highly swollen condition is a mixture of approximately 50% dioxane and approximately 50% water, and it is employed at room temperature.
• I can produce cellulose acetate threads possessing axially regular crystalline structure, recognizable as such by X-ray analysis, by stretching the threads in an aqueous solution of acetone which can be comparatively dilute, provided that it is maintained at a relatively high temperature, the thread being introduced into this solution not in the form of a finished thread but in the form of a thread swollen with acetone at the moment when it emerges from the spinneret.
• I have found that by wet spinning a cellulose acetate solution into a coagulation bath of an aqueous acetone solution under the conditions hereinafter more fully explained I can produce an artificial thread of high tensile. strength and having an axiallyregular crystal-' line structure recognizable as such by X-ray analysis.
• the temperature of the aqueous acetone bath is higher than room temperature and it should be near and even above that of the boilingpoint of acetone. Satisfactory results have been secured when the bath was at a temperature of from 50 C. to 65 C.
• Theconcentration of acetone of the media used should be from 20% to by weight. I have found that by working in this manner it is not necessary in order to obtain glossy threads to add to the super-swelling bath substances which retard the action of precipitation. This is possibly due to the fact that I work with a stretching greater than 1000%.
• the process described can be easily carried out utilizing spinning solutions of cellulose acetate in some suitable solvent, preferably acetone, whose concentration can vary according to the original viscosity of the cellulose ester. This concentration may, for example, be between 20% and The spinnerets used have holes the diameters of which are always greater than 0.12 millimeter and preferably lie between 0.15 and 0.20 millimeter.
• the coagulation bath itself can be utilized as a heating fluid for the spinneret head. In this case the temperature of the spinning solution will be the same as that of the coagulation bath.
• the thread produced according to the present invention possesses axially regular crystalline structure and a strength of more than 3 grams to the denier. A strength of 4 grams can-be reached and probably even more.
• the elongation at the breaking point isabout 6% to 7%.
• After or during the making of the thread it can be twisted, lubricated, dressed, oiled, or otherwise treated to facilitate its final employment in various textile operations. It may be submitted to a saponification treatment to give it-an afiinity for direct cotton dyes, andit may also be submitted to a swelling treatment withor without tension in order to increase its elongation at breaking point.
• Example 1 A- spinning solution containing 27% cellulose acetate dissolved in acetone was spun into an aqueous coagulation bath containing 23% to 25% of acetone by weight and maintained ata tem- 'perature of 63 C.
• The-spinneret holes were 0.18 millimeter, and the speed of winding was 114 meters a minute.
• the thread obtained gave a titre of 60 deniers for 80 filaments and possessed a tensile strength of 3.5 to 3.8 grams per denier" with an elongation at breaking point'of 6% to 7.5%.
• Example 2 A spinning solution composed of cellulose acetate dissolved in acetone was spun into an aqueous coagulation bath containing 28% to 29% 4 acetone by weight maintained at a temperature of 50 C. The winding speed was 100 meters a minute and the spinneret used had holes of 0.18 millimeter. The thread obtained gave a titre of 100- deniers for 150 filaments and had atensile strength of 3.1 grams per denier and anelongation of 6.2%.
• a coagulating bath consisting of water and I 20% to 30% by weight of acetone and'maintained at a temperature of the order of the boiling point of acetone, and winding the thread at a speed of at least 100 meters per minute.
• A- process of producing artificial thread havunder X-rays which comprisesspinning a celluloseacetate solution through. spinnerets having holes from .15 to .20 millimeter in diameter into a coagulating bath consisting of water and 20% to 30% by weight of acetone and maintained at a. temperature of from 50 C. to 65 C., and winding the thread at a speed of at least 100 meters per minute.
• a process of producing artificial thread having relatively high tensile strength and possessing axially regular crystalline structure visible under X-rays which comprises spinning a solution of cellulose acetate in acetone through spinnerets having holes, the diameters of which are greater than-.12millimeter and not over .20 millimeter, in a coagulating bath consisting of water and 20% to 30% by weight of acetone and main- 'tained at a temperature of the order of the boiling point of acetone, and winding the thread at a speed of at'least 100 meters per minute.
• a process of producing artificial thread hav-" ing relatively high tensile strength and possessing axially regular crystalline structurevisible under X-rays' which comprises spinning a solution of cellulose acetate in acetone through spinnerets having holes from .15 to 20 millimeters in diameter in a coagulating bath. consisting of water and 20% to 30% by weight of acetone and maintained at a temperature of the order of the boiling point of acetone, and winding the thread at a speed of at least'100 meters per minute.
• a process of producing artificial thread havingrelatively high tensile strength and possessing axially regular crystalline structure visible under X-rays which comprises spinning a solumaintained at a temperature of from 50 C. to --65 C.,- and winding the thread at a speed of at least 100 meters per minute.
• a process of producing artificial thread havrnodifications may be made in the above descripmg relatively high tensile strength and possesstion of cellulose acetate in acetone through spinnerets having holes 0.18 millimeter in diameter in a'coagulating bath consisting of water and 23% to 25% by weight of acetone and maintained at a temperature of 63 C., and winding the thread at a speed of approximately 114 meters per minute.
• a process of producing artificial thread having relatively high tensile strength and possessing axially regular crystalline structure visible under X-rays which comprises spinning a solution of cellulose acetate in acetone through spinnerets having holes 0.18 millimeter in diameter in a coagulating bath consisting of water and 28% to 29% by weight of acetone and maintained at a temperature of 50 C., and winding the thread at aspeed of approximately 100 meters per minute.
• steps which comprise spinning a solution of cellulose acetate through a spinneret into a coagulating bath consisting of water and to by weight of acetone maintained at a temperature of the order of the boiling point of the acetone, and winding the thread at a speed to stretch the previously produced thread at least 1000%.
• steps which comprise spinning a solution of cellulose acetate through a spinneret into a coagulating bath consisting of water and 20% to 30% by weight or acetone maintained at a temperature of the order of the boiling point of the acetone, and winding the thread at a speed of at least 100 meters per minute.
• steps which comprise spinning a solution of cellulose acetate through a spinneret into a coagulating bath consisting of water and 20% to 30% by weight of acetone maintained at-a temperature of from C. to C., and winding the thread at a speed of at least meters per minute.

Landscapes

• Chemical & Material Sciences (AREA)
• Chemical Kinetics & Catalysis (AREA)
• General Chemical & Material Sciences (AREA)
• Engineering & Computer Science (AREA)
• Textile Engineering (AREA)
• Artificial Filaments (AREA)
• Materials For Medical Uses (AREA)

Applications Claiming Priority (1)

Publications (1)

Family

ID=10063005

Family Applications (1)

Country Status (5)

Cited By (4)

Families Citing this family (1)

• 0
  • BE BE421804D patent/BE421804A/xx unknown
• 1936
  • 1936-06-04 GB GB15653/36A patent/GB475368A/en not_active Expired
• 1937
  • 1937-04-01 US US134278A patent/US2145076A/en not_active Expired - Lifetime
  • 1937-05-27 DE DES127331D patent/DE704824C/de not_active Expired
  • 1937-05-27 FR FR822284D patent/FR822284A/fr not_active Expired

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