Classifications

• • A—HUMAN NECESSITIES
  • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
  • A61L—METHODS OR APPARATUS FOR STERILISING MATERIALS OR OBJECTS IN GENERAL; DISINFECTION, STERILISATION OR DEODORISATION OF AIR; CHEMICAL ASPECTS OF BANDAGES, DRESSINGS, ABSORBENT PADS OR SURGICAL ARTICLES; MATERIALS FOR BANDAGES, DRESSINGS, ABSORBENT PADS OR SURGICAL ARTICLES
  • A61L15/00—Chemical aspects of, or use of materials for, bandages, dressings or absorbent pads
  • A61L15/16—Bandages, dressings or absorbent pads for physiological fluids such as urine or blood, e.g. sanitary towels, tampons
  • A61L15/42—Use of materials characterised by their function or physical properties
  • A61L15/60—Liquid-swellable gel-forming materials, e.g. super-absorbents
• • A—HUMAN NECESSITIES
  • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
  • A61L—METHODS OR APPARATUS FOR STERILISING MATERIALS OR OBJECTS IN GENERAL; DISINFECTION, STERILISATION OR DEODORISATION OF AIR; CHEMICAL ASPECTS OF BANDAGES, DRESSINGS, ABSORBENT PADS OR SURGICAL ARTICLES; MATERIALS FOR BANDAGES, DRESSINGS, ABSORBENT PADS OR SURGICAL ARTICLES
  • A61L15/00—Chemical aspects of, or use of materials for, bandages, dressings or absorbent pads
  • A61L15/16—Bandages, dressings or absorbent pads for physiological fluids such as urine or blood, e.g. sanitary towels, tampons
  • A61L15/22—Bandages, dressings or absorbent pads for physiological fluids such as urine or blood, e.g. sanitary towels, tampons containing macromolecular materials
  • A61L15/225—Mixtures of macromolecular compounds
• • A—HUMAN NECESSITIES
  • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
  • A61L—METHODS OR APPARATUS FOR STERILISING MATERIALS OR OBJECTS IN GENERAL; DISINFECTION, STERILISATION OR DEODORISATION OF AIR; CHEMICAL ASPECTS OF BANDAGES, DRESSINGS, ABSORBENT PADS OR SURGICAL ARTICLES; MATERIALS FOR BANDAGES, DRESSINGS, ABSORBENT PADS OR SURGICAL ARTICLES
  • A61L15/00—Chemical aspects of, or use of materials for, bandages, dressings or absorbent pads
  • A61L15/16—Bandages, dressings or absorbent pads for physiological fluids such as urine or blood, e.g. sanitary towels, tampons
  • A61L15/42—Use of materials characterised by their function or physical properties
  • A61L15/50—Lubricants; Anti-adhesive agents
• • D—TEXTILES; PAPER
  • D01—NATURAL OR MAN-MADE THREADS OR FIBRES; SPINNING
  • D01D—MECHANICAL METHODS OR APPARATUS IN THE MANUFACTURE OF ARTIFICIAL FILAMENTS, THREADS, FIBRES, BRISTLES OR RIBBONS
  • D01D1/00—Treatment of filament-forming or like material
  • D01D1/02—Preparation of spinning solutions
• • 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
• • 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
  • D01F6/00—Monocomponent artificial filaments or the like of synthetic polymers; Manufacture thereof
  • D01F6/44—Monocomponent artificial filaments or the like of synthetic polymers; Manufacture thereof from mixtures of polymers obtained by reactions only involving carbon-to-carbon unsaturated bonds as major constituent with other polymers or low-molecular-weight compounds
  • D01F6/52—Monocomponent artificial filaments or the like of synthetic polymers; Manufacture thereof from mixtures of polymers obtained by reactions only involving carbon-to-carbon unsaturated bonds as major constituent with other polymers or low-molecular-weight compounds of polymers of unsaturated carboxylic acids or unsaturated esters
• • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
  • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
  • Y10S—TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
  • Y10S604/00—Surgery
  • Y10S604/904—Tampons

Definitions

• the alloy fibers are prepared by mixing an aqueous solution of sodium polyacrylate or aqueous solution of sodium hydroxide and polyacrylic acid with viscose at any stage of ripening, forming the mixture into fibers, coagulating and regenerating the fibers, and drying the fibers in the alkaline state.
• the fibers are coagulated and regenerated in an acid bath, washed, finished by application of an aqueous alkaline finish composition for cellulose, and dried.
• These fibers are now alkaline and cardable, and are prepared in a conventional manner into articles for absorbing body fluids.
• Sodium polyacrylate solutions or polyacrylic acid emulsions are readily commercially available and need not be described in detail.
• the solutions which are mixed with the viscose preferably have solids concentrations of from about 2.5 to about 42 I3 percent.
• Sodium hydroxide is added to polyacrylic acid emulsions to obtain the sodium polyacrylate solutions.
• the filament-forming viscose used herein is also well known and need not be described in detail.
• alkali cellulose is reacted with carbon disulfide and the resulting sodium cellulose xanthate is diluted with sodium hydroxide to produce the viscose which is aged to spinning viscosity.
• Additives or modifiers may be mixed with the viscose, if desired.
• the alloy fiber which is formed predominantly from viscose is coagulated and regenerated by known means and preferably in an acid bath containing sulfuric acid and sodium sulfate.
• Zinc sulfate is often incorporated in the bath as well as other coagulation modifiers, as desired.
• the sodium polyacrylate solution may be mixed with the viscose will preferably range from about 6 to about lOpercent based on the weight of the viscose solution.
• the mixture may be run through a blender or homogenizer to assure a thorough mix, if desired.
• the mixture is then pumped to the spinneret and extruded in the form of fibers into a coagulating medium. After coagulation and at least partial regeneration, the fibers are stretched, if desired, conventionally wet processed and treated with an aqueous lubricating finish composition.
• the fibers are then dried to an alkaline, cardable product.
• the sodium polyacrylate containing viscose during processing into fibers is alternately in the alkaline state, the neutralized state and the alkaline state.
• the sodium polyacrylate is neutralized.
• the wet gel fibers are made alkaline preferably in the finish bath. An alkaline bath preceding the finish bath may also be used, if desired.
• the aqueous alkaline lubricating finish is preferably a bath containing an aqueous solution of sodium carbonate and sorbitan monolaurate, however, other alkaline agents and lubricating agents may be employed as taught in the art for ordinary rayon yarn.
• finishes for cellulose fibers include partial higher fatty acid esters of sorbitan or mannitan and their polyoxyethylene derivatives, sodium oleate and oleic acid.
• alkaline agents for alkalizing the fibers include dibasic ammonium phosphate, dibasic sodium phosphate, tribasic sodium phosphate, sodium tetraborate and the like.
• the fiber is usually cut in the form of staple before drying, dried and shipped to the manufacturer of the absorbent articles.
• the absorbent articles may require carding of the fibers which is accomplished in the usual manner without difficulty.
• the fibers are formed into the tampon in accordance with any desired procedure. They may be blended with any other fibers which may or may not serve to enhance the properties of the absorbent articles. Some fibers with which the alloy fibers of this invention may be blended include rayon, cotton, chemically modified rayon or cotton, cellulose acetate, nylon, polyester, acrylic, polyolefin and similar fibers.
• the fluid holding capacity of the alloy fibers of this invention was determined in accordance with the following procedure.
• Sample staple fibers are carded or well opened, conditioned and two grams placed in a 1 inch diameter die.
• the fibers in the die are then pressed to 0.127 inches the viscose at any stage of the viscose ripening. Con- I thickness for one minute, removed and placed on a porous plate (e.g., a Buchner funnel) so that the 1 inch diameter foot of a plunger weighing 2.4 pounds rests on the test pellet. (The plunger is held in a vertical position and is free to move vertically).
• the pellet is then wetted with water which flows into the funnel from the stem which is connected by a flexible tube to a dropping bot tle, the flow of water being controlled by the position of the dropping bottle. After two minutes immersion, the water is drained for three minutes, the wet pellet is removed and weighed.
• the fluid holding capacity of the fibers in cc./g. is one-half the weight of water in the test pellet.
• the viscose composition was 9.0 percent cellulose, 6.0 percent sodium hydroxide and 32 percent carbon disulfide, based on the weight of the cellulose.
• the viscose ball fall was 70 and its common salt test was 8.
• the mixture was spun through a 720 hole spinneret into an aqueous spinning bath consisting of 7.5 percent by weight of sulfuric acid, 18 percent by weight of sodium sulfate and 3.5 percent by weight of zinc sulfate.
• the alloy fibers passed through the bath and were washed with water, desulfurized and washed again with water.
• the wet gel fibers were then passed through an alkaline finish bath consisting of 1 percent by weight of sodium carbonate and 1 percent by weight of sorbitan monolaurate (Span 20). The fibers were cut, dried and carded.
• the fluid holding capacity was tested for fibers having different amounts of sodium polyacrylate in the alloy fibers in the previously described test procedure. The results are set forth in the following table along with results for other fibers prepared as above except that these alloy fibers were prepared with polyacrylic acid without the formation of the sodium salt in the dried fiber product.
• polyacrylate salts of other alkalimetals such as potassium and lithium, and ammonium are also included and may be successfuly used to replace sodium polyacrylate in the example.
• An article of manufacture comprising a highly fluid absorbent mass of alloy fibers, said alloy fibers comprising a matrix of regenerated cellulose and polyacrylic acid salt of alkali-metals or ammonium uniformly dispersed therein.

Landscapes

• Health & Medical Sciences (AREA)
• Engineering & Computer Science (AREA)
• Chemical & Material Sciences (AREA)
• Veterinary Medicine (AREA)
• Epidemiology (AREA)
• Life Sciences & Earth Sciences (AREA)
• Animal Behavior & Ethology (AREA)
• General Health & Medical Sciences (AREA)
• Public Health (AREA)
• Hematology (AREA)
• Materials Engineering (AREA)
• Textile Engineering (AREA)
• Chemical Kinetics & Catalysis (AREA)
• General Chemical & Material Sciences (AREA)
• Mechanical Engineering (AREA)
• Dispersion Chemistry (AREA)
• Artificial Filaments (AREA)
• Absorbent Articles And Supports Therefor (AREA)
• Compositions Of Macromolecular Compounds (AREA)
• Chemical Or Physical Treatment Of Fibers (AREA)
• Woven Fabrics (AREA)
• Nonwoven Fabrics (AREA)
• Solid-Sorbent Or Filter-Aiding Compositions (AREA)

Priority Applications (13)

Applications Claiming Priority (1)

Related Child Applications (1)

Publications (1)

Family

ID=22987109

Family Applications (2)

Family Applications After (1)

Country Status (12)

Cited By (16)

Families Citing this family (18)

Citations (6)

Family Cites Families (2)

• 1972
  • 1972-06-05 US US00259944A patent/US3844287A/en not_active Expired - Lifetime
• 1973
  • 1973-05-08 SE SE7306473A patent/SE403706B/xx unknown
  • 1973-05-09 GB GB2204373A patent/GB1430634A/en not_active Expired
  • 1973-05-16 CA CA171,486A patent/CA987894A/en not_active Expired
  • 1973-05-16 DE DE2324589A patent/DE2324589C3/de not_active Expired
  • 1973-05-29 AT AT473273A patent/AT331993B/de not_active IP Right Cessation
  • 1973-06-01 NL NL7307655.A patent/NL162304C/xx not_active IP Right Cessation
  • 1973-06-04 FR FR7320230A patent/FR2187947B1/fr not_active Expired
  • 1973-06-04 ES ES415534A patent/ES415534A1/es not_active Expired
  • 1973-06-04 IT IT25046/73A patent/IT1019544B/it active
  • 1973-06-04 BE BE131863A patent/BE800435A/xx unknown
  • 1973-06-04 JP JP6205673A patent/JPS5430236B2/ja not_active Expired
• 1975
  • 1975-08-27 US US05/608,304 patent/USRE30029E/en not_active Expired - Lifetime

Patent Citations (6)

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