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
  • D01F1/00—General methods for the manufacture of artificial filaments or the like
  • D01F1/02—Addition of substances to the spinning solution or to the melt
  • D01F1/10—Other agents for modifying properties
• • 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
  • D01F6/58—Monocomponent artificial filaments or the like of synthetic polymers; Manufacture thereof from homopolycondensation products
  • D01F6/60—Monocomponent artificial filaments or the like of synthetic polymers; Manufacture thereof from homopolycondensation products from polyamides

Definitions

• This invention relates to the production of fine denier filaments and muitifiiament yarns and threads composed of a synthetic linear polymer. More particularly, this invention relates to the production of such filaments, yarns and threads containing incorporated therein a finely divided, inert material in an amount less than that which will produce a substantially visible delusterins or dulling eilect. whereby the rupturing of the filaments or yarn, during the coid-drawins thereof, will be materially diminished.
• melt-spinning and cold-drawing that is, drawing under tension in the solid state
• the U. B. patents to Carothers Nos. 2,071,250, 2,071,201, 2,071,253 and 2,180,048 all disclose the melt-spinning and cold-drawing oi synthetic linear polymers including polyamides, polyesters, polyethers and polyanhydrides as well as mixed polymers or interpolymers, for example polyamide-polyesters.
• the synthetic linear polyamides more particularly described in the last two above mentioned patents.
• other synthetic linear polymers for xample vinylidene dichloride polymers, acrylonitrile polymers and interpolymers of vinyl acetate and vinyl chloride can be melt spun and cold-drawn.
• the present invention in its broad aspects is applicable to the melt spinning and cold-drawing of any fiber-forming synthetic linear polymer.
• the cold drawing of synthetic linear polymer yarn is usually done by feeding the yarn from one pair oi positively driven rollers to a second pair of positively driven rollers rotating at a suitably higher speed than said first pair.
• the draw tension is concentrated at a precise point between the pairs of rollers to prevent wandering of the draw-point.
• the objects of the invention may be accomplished, in general, by producing bright, colddrawable, fine denier filaments and multifilament yarns composed of a synthetic linear polymer containing, homogeneously dispersed throughout the body thereof. a finely divided, inert material in an amount substantially less than that which will produce a visible delustering efiect.
• the preferred procedure for accomplishing this is to prepare a melt of a synthetic linear polyamlde containing from 0.005% to 0.05% by weight of the finely divided, inert material, for example titanium dioxide, and melt spinning the polyamide in a known manner.
• Example I to be understood how- The yarn was not visibly delustered.
• Example I Polyhexamethylene adipamide polymer of relatlve viscosity 34 (determined by the method described below) and containing 0.05% by weight A similar polyhexamethylene adipamide oi relative viscosity 34 (determined by the method described below). but containing no titanium dioxide was melt spun to form a 69-fiiament yarn which was subsequently cold drawn at a draw ratio of 4.40 to produce a 210 denier-68 filament yarn with a tenacity of 6.5 grams per denier and an elongation oi 14%. In the drawing operation here were several complete yarn breaks and a creel mirror test showed seventy broken filaments per 1,000 yards of yarn.
• a second sample oi the polymer mentioned in the previous paragraph was melt spun to form The yarn was subsequently yards of yarn.
• the relative Viscosity may be between 15 and 80.
• the melt and colddrawing of poivhexamethylene adipenude ram is not limited to the use of titanium dioxide. but
• Quantities of 0.01% to 0.03% of titanium dioxide, based on the weight of the polyamide, are preferred.
• the quantities of 0.005% to 0.05% weight are effective to produce the desired results while at the same time permitting the production of bright filaments and yarn and the term "bright" is intended to signify filaments and yarn having a brightness not less than that which is incident to the use of said quantities of titanium dioxide.
• One skilled in the art can quite readily determine the optimum proportion of any other finely divided, inert material which may be used instead 01' the titanium dioxide.
• finely divided, inert material is meant a material which has no chemical action on said polymer and which is in a state of division of the order of yarn delustering or pismenting material.
• the invention described herein has importantly advanced the art of producing cold-drawn. bright filaments and yarns composed of a synthetic linear polymer, thereby permitting maximum production of excellent yarn with existing equipment. It has now been found that, by the practice of this invention, the number of yarn and filament breaks during cold-drawing is decreased and a larger percentage of production can now be classified as completely satisfacwry run. It has been found too that bright yarn can be produced having the desired high tenacity (highly drawn yarn) and fine denier per filament.
• a surprising and unexpected result of the invention is that the yarn produced in accordance 'with this invention is not nearly so wild" on a yarn.
• An unoriented, cold-drawable, filamentous structure composed of a synthetic linear polyamide containing, homogeneously dispersed throughout the body thereof, a finely divided. inert material in an amount from 0.005% to 0.05%.
• An unoriented, cold-drawable, filamentous structure composed oi polyhexamethylene adipamide containing, homogeneously dispersed throughout the body thereof. a finely divided. inert material in an amount from 0.005% to 0.05%.
• I. ran unoriented, cold-drawable, filamentous structure composed of a synthetic linear polyamide containing homogeneously dispersed throughout the body thereof finely divided titanium dioxide in an amount from 0.005% to 0.05%.

Landscapes

• Engineering & Computer Science (AREA)
• Chemical & Material Sciences (AREA)
• Chemical Kinetics & Catalysis (AREA)
• General Chemical & Material Sciences (AREA)
• Textile Engineering (AREA)
• Manufacturing & Machinery (AREA)
• Artificial Filaments (AREA)
• Multicomponent Fibers (AREA)

Priority Applications (4)

Applications Claiming Priority (1)

Publications (1)

Family

ID=23911366

Family Applications (1)

Country Status (4)

Cited By (14)

• 1943
  • 1943-03-31 US US481287A patent/US2385890A/en not_active Expired - Lifetime
• 1944
  • 1944-03-29 GB GB5775/44A patent/GB576647A/en not_active Expired
• 1947
  • 1947-08-06 FR FR951371D patent/FR951371A/fr not_active Expired
• 1950
  • 1950-09-24 DE DEP3599A patent/DE901332C/de not_active Expired

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