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Publication numberUS3914488 A
Publication typeGrant
Publication date21 Oct 1975
Filing date24 Sep 1973
Priority date24 Sep 1973
Also published asCA1042168A1, DE2445558A1, DE2445558C2
Publication numberUS 3914488 A, US 3914488A, US-A-3914488, US3914488 A, US3914488A
InventorsAdly Abdel-Moniem Gorrafa
Original AssigneeDu Pont
Export CitationBiBTeX, EndNote, RefMan
External Links: USPTO, USPTO Assignment, Espacenet
Polyester filaments for fur-like fabrics
US 3914488 A
Abstract
Polyester filaments of 2 to 14 denier per filament having oblong cross sections of shapes illustrated are particularly useful in pile fabrics for providing fur-like aesthetics. In comparison with previous polyester fibers, the new fibers provide an improved smooth, non-tacky, resilient hand and pleasing luster, with freedom from fibrillation during processing or use of the fabric.
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Description  (OCR text may contain errors)

Gorrafa Oct. 21, 1975 POLYESTER FILAMENTS FOR FUR-LIKE FABRICS 75 Inventor: Adly Abdel-Moniem Gorrafa,

Hockessin, Del.

[73] Assignee: E. I. Du Pont de Nemours & Co.,

Wilmington, Del.

[22] Filed: Sept. 24, 1973 [21] Appl. No.: 400,037

{52] US. CL, 428/397; 15/159 A; 264/177 F 3,239,865 3/1966 Munt 264/177 F 3,249,669 5/1966 Jamieson 3,344,457 10/1967 Grobert 3,351,205 11/1967' Butler et a1 264/177 F 3,470,685 10/1969 Hall 264/177 F FOREIGN PATENTS OR APPLICATIONS 669,246 10/1964 Italy 264/177 F 71,385 4/1942 Czechoslovakia 161/177 41-17694 10/1966 Japan 42-5250 3/1967 Japan 264/177 F Primary Examiner-George F. Lesmes 51 Int. Cl D02g 3/00 {58] Field of Search 15/159 A; 264/177 F;

161/177, 179, 180, 62 [5 ABSTRACT Polyester filaments of 2 to 14 denier per filament hav- References C'ted ing oblong cross sections of shapes illustrated are par- UNITED STATES PATENTS ticularly useful in pile fabrics for providing fur-like 2,149,425 3/1939 Draemann 15/159 A aesthetics- In comparison with Previous Polyester 2,831,748 4/1958 Finlagson 264/177 F bars, the new fibers provide an improved smooth, non- 3,l09,220 11 1963 McKinney et a1. 15/ 159 A tacky, resilient'hand and pleasing luster, with freedom 3,156,607 11/1964 Strackan 161/177 from fibrillation during processing or use of the fabric. 3,219,739 11/1965 Breen et al..... 3,238,553 3/1966 Bailey et a1. 15/159 A l Clalm, 6 Drawlng Flgures r 2 X B i o U.S. Patent Oct. 21, 1975 3,914,488

FIG-

2 r /x d FI6.Z FIG"? FIG.4

FIG.5

FIG.6

POLYESTER FILAMENTS FOR FUR-LIKE FABRICS BACKGROUND OF THE INVENTION Pile fabrics resembling furs'have in recent years been manufactured from synthetic organic polymeric fibers and widely sold for use in garments. These pile fabrics have been used both as liners for garments or as the actual outside surface of the garment. The pile fibers have usually been acrylics, modacrylics, polyamides or polypropylene. In general, polyesters have been missing from this list because of problems relating to aesthetics. In particular, these fibers tend to develop a tacky hand when exposed to stock dyeing unless special precuations are taken. It has been found that the tacky quality results from a polyester trimer which exudesfrom the fiber during processing. The trimer and other low molecular weight materials may be removed by careful treatments, but this entails additional expense in fabric manufacture.

The objective of the present invention isto provide a polyester filament for use in fur-like fabrics having (I) a smooth, non-tacky hand, (2) pleasing luster, (3) low bending stiffness compared to round fibers, (4) good resilience in the pile, and (5) freedom from fibril lation propensity. 7

SUMMARY OF THE INVENTION The invention provides a polyester filament having a denier per filament from 2 to 14 and an oblong filament cross-section continuously along its length. The filament cross-section is characterized by major and minor axes of symmetry which are perpendicular to each other, by a ratio of length to width measured along the axes of from 1.4 to 2.4, by a lobe located on each extremityof the major axis which has a tip radius ratio r /R of 0.20 to 0.45, where r is the radius of the lobe tip and R is the radius of a circle circumscribed about the oblong section, by 'a lobe located on each extremity of the minor axis which has a tip radius ratio r /R of 0.8 to 2.1 times the tip radius ratio of the lobes on the major axis, and by indentations between the lobes, the shortest distance d between two of the indentations on opposite sides of the major axis being from 1.2 to 2.0 times the radius r, of the lobes on the major axis.

LIST OF FIGURES FIG. 1 is a diagram illustrating the method'for measuring the various filament cross-section parameters.

FIGS. 2-4 illustrate cross-sections for several filament shapes'within the scope of the inventon. The black dots on these cross-sections indicate approximate centers of curvatures for various parameters which will bedescribed in'detail.

FIG. 5 is a plan view of a cluster of three adjacent spinneret orifices used for making a single filament according to Example I. FIG. 6 is a plan view of a cluster of three adjacent spinneret orifices used for making a single filament according to Example II;

DETAILS OF THE INVENTION.

Considering FIG. 1, the cross-sectional configuration of fibers within the invention may be determined from a photomicrograph of the fiber cross-section. The length of cross-section along the major axis X is indicated by A. The widthof the cross-section along the minor axis Y is indicated by B. The ratio of length to width of the cross-section is A/B.

' In the melt-spinning of filaments, the polymer tends to flow so as to produce smooth curves or combinations of smooth curves and straight lines in the periphery of the cross-section. For the purpose of measurement, the periphery may be considered to be composed of straight'lines and arcs of circles. Using this concept, filaments of the invention have a lobe located at each end of the major cross-sectional axis, the extreme portion of the lobe being an arc of a circle. The radius of this lobe tip is indicated by r at each end. Likewise, a lobe is located at each end of the minor axis Y of the crosssection; the radius for each lobe tip being indicated by r While FIG. 1 shows the center of curvature for both lobes at the same point on the minor axis, this is not essential. The centers of curvature for the lobes on the minor axis may be separated, for example, as in FIGS. 2 to 4. The circumscribing radius for the cross-section is indicated by R. The tip radius ratio for the lobes on the major axis is r /R and for the lobes on the minor axis is r /R.

Another feature which is characteristic of the cross section is r which is the radius of the circular are between two adjacent lobes. While this dimension is useful for constructing the theoretical outline of the crosssection, an easier feature for use in measurement is the distance d, which is the shortest distance between two indentations measured across the major axis of the fiber cross-section.

According to the invention, the ratio of length to width A/B of the cross-section is from 1.4 to 2.4 and the tip radius ratio r lR for the lobes on the major axis is between 0.20 and 0.45. The tip radius ratio of the lobes on the minor axis is from 0.8 to 2.1 times the tip radius ratio of the lobes on the major axis. The crosssection must be properly indented between lobes to provide the desirable properties of the invention; for this reason, the ratio d/2r is from 0.6 to 1.0.

While the above features may appear to be complicated,they are quite simple to measure on enlarged photomicrographs of cross-sectional views and the stated parameters are critical for obtaining the desirable fiber and pile fabric properties.

Each of the FIGS. 1 to 4 show cross-sectional shapes within the scope of the invention. The measurements for each of these are shown in Table l.

The precise reasons for the unusual combination of properties of the invention are not completely understood but a few general principles have emerged in the course of developing the fibers of the invention. First it is necessary to have sufficient indentations in the cross-section to permit hiding of trimer and other low molecular weight materials present in polyester fibers. When synthetic fibers are incorporated in fur-like pile fabrics, the pile fabrics are ironed and stroked very vigorously with a fur iron to remove fiber crimp thereby providing a smooth hand for the pile fabric. This ironing operation tends also to deposit the low molecular weight materials in the grooves of the fiber thereby removing it from the broad tactile surfaces of the fiber. The resulting fabric has an exceptionally smooth pleasant tactile hand.

Another-guideline of the invention is to avoid providing large areas of finger contact. For this purpose the cross-section of the filament of the invention is designed so that it does not pack closely with adjacent filaments.

The denier per filament, which is between 2 and 14, and the oblong cross-section of the fiber is important for providing fur-like fabrics with a soft feel but which still have resilience in the pile. Filaments with oblong cross-section are more satisfactory for this reason than filaments of generally round cross-section of the same denier per filament. The oblong cross-section filaments tend to bend easily in at least one direction providing a soft hand. If denier is at least 2 and no more than 14, the fur-like fabrics have soft hand and good resilience.

Filaments of the invention have a pleasant luster since they have a lobed surface. Another important feature of the invention is avoidance of fibrillation. The tip radius ratio of the lobes and the relative sizes of the major and minor lobes appear to have bearing on this quality. Polyester filaments which are too highly indented or which have thin fins along the length tend to fibrillate when passed through the fur iron, and during the life and use of the garment. The fibrillation in turn makes the garment unsatisfactory because of the matted appearance, particularly around the collar. The filaments of the invention avoid fibrillation by having a large mass at the center of the cross-section, by avoiding excessive indentation, and by requiring a tip radius ratio above 0.2 for the lobes on the major axis.

EXAMPLE I A multifilament yarn of polyethylene terephthalate continuous filaments was melt-spun at 305C. from a polymer containing 0.1% titanium dioxide having a relative viscosity of 21 determined for a solution of 80 mg. of polymer in ml. of hexafluoroisopropanol solvent at 25C. The polymer was extruded at the rate of'8.5 lbs./hr. through a spinneret having 36 clusters of diamond-shaped orifices, there being three diamondshaped holes in each cluster. The three orifices within each cluster were closely spaced to permit melt coalescence immediately after extrusion. A plan view of a single cluster is shown in FIG. 5. The length of the central diamond-shaped orifice in the cluster measured along the face of the spinneret was 0.020-inch and the width was 0.0l2-inch. The two orifices located on each side of the central orifice were 0.016-inch long and 0.009- inch wide. The three orifices in each cluster were separated a distance of 0.003-inch and were located in a straight row with their longest dimensions parallel as indicated in FIG. 5. The multifilament yarn produced from the 36-cluster spinneret was wound up at 1200 yards/minute. The wound-up yarn at this point was 530 denier with 36 filaments. (Denier per filament was 14.7.)

About 100 ends of yarn were combined to produce tow of about 53,000 denier. This tow was drawn in 90C. water to obtain tow having filaments of 4.6 denier per filament. Samples of the tow 10 inches in length had the following properties: tenacity 4.0 gpd, break elongation 31%, boil-off shrinkage 2.1%, dry heat shrinkage at 196C. 7.2%. The tow was then passed through a stuffer-box crimper. The filaments after this point had 9 crimps per inch and the denier was 4.6 per filament. The crimped tow was cut to staple 1.25 inches in length.

The drawn filaments prepared from the threediamond orifices had a scalloped oval cross-section with the following parameters: A/B 1.6; r /R 0.33;

r /r 1.34; and d/2r 0.82. The cross sections were obtained by embedding a bundle of filaments in a resin medium and cutting with a microtome. The resulting slices were observed in a microscope under an immersion oil and were then photographed and enlarged for measurement.

The staple fibers were stock-dyed at 250F. under pressure using 3 grams per liter of a modified liquid biphenyl as dye carrier and the following disperse dyes based on the fabric weight): 2.7% Latyl Bordeaux B; 3.1% Latyl Cerise N, and 0.8% Latyl Brown MS. The dyebath was drained after the temperature had cooled to F. No scouring step was employed after the dye cycle. The resulting fibers were maroon in color after tumble drying. These fibers were processed into silver.

The above dyeing conditions have been shown to leave a tacky low molecular weight material on the surface of round fibers; in the present example with fibers of scalloped oval cross section, this material was again found present. Although the same tacky material was found present as particles on the surface of filaments of this example, it did not adversely affect the aesthetic properties of fur-like fabric prepared from these filaments. To avoid a tacky feel in pile fabrics made with round fibers, it has usually been necessary to cool the bath to only about before separating fiber from bath and to scour the resulting fibers in a separate operation at close to the boiling point.

A sliver knit fabric was prepared from the above dyed staple as follows: First, the dyed staple was processed on a woolen card to produce a 125 grain sliver. The sliver was then fed to a Wildman Maxi-Pile sliver knit machine. The machine is similar in basic principle to the machine depicted in U.S. Pat. No. 3,516,265 for furs of uneven density, but in the present case furs of uniform density were prepared. Sufficient staple fiber was picked up by the machine to give a knit tubing with a total weight of 8.5 oz./linear ft. The backing yarn for this fabric was a singles yarn with a cotton count of 14 made of polyethylene terephthalate homopolymer staple wherein the polymer had a relative viscosity of 23. The filaments were 3.0 denier per filament and 2 inches in length.

Following knitting, the tubing was slit and backcoated with an acrylic resin latex, then heated to crosslink the resin and to dry. The resulting sliver-knit fabric was then finished in the following sequence: (1) sheared in two passes to 7/l6'-inch pile length; (2) passed four times under a fur iron similar to that shown in U.S. Pat. No. 3,557,415, otherwise known as an electrifier cylinder. The cylinder was maintained at 380F. The pile fabric was passed under the iron at 3% yards per minute at moderate pressure. After 4 passes, the crimps at the ends of the pile fibers were substantially removed as desired; (3) resheared and wire-brushed, 1 pass; (4) resheared without brushing; (5) ironed again at 380F., 6 passes; (6) resheared 7/ 16-inch, twice; (7) ironed at 300F. to polish, twice; and (8) sheared at 7/l6-inch, twice.

The resulting fabric had a pleasing luster and the hand of the fabric was non-tacky. The pile was soft and resilient. There was no evidence of fibrillation, i.e., no split fiber ends observed in microscopic examination of the fabric. The hand was much less tacky than for similar fabric made from round fibers. Other properties of v the fabric are shown in Table 2. It will be noted from Table 2 that the fabric contained 0.85% of an extractable material which is largely in the form of surface deposits of polyester trimer. A stereoscan photomicrograph showed that the surface deposits were primarily in the grooves of the fibers. Apparently, surface deposits in this location were not available to fingers touching the pile fabric. Pile fabrics of round fibers with similar amounts of extractables were tacky and unpleasant.

EXAMPLE II Filaments with scalloped oval cross-section were prepared from a different type of spinneret, but were otherwise prepared as in Example I. In this case the spinneret orifice consisted of 36 clusters with 3 round holes each. The 3 holes in each cluster were interconnected by channels as shown in FIG. 6. The outer holes were 0.008 inch in diameter and the large center hole was 0.0105 inch in diameter. The connecting channels were about 0.0025 inch wide and 0.004 inch long. The outer holes were each centered 0.0133-ir1ch from the center of the center hole.

The resulting filaments had a bundle tenacity of 3.3 gpd, elongation at break of 28% and boil-off shrinkage of 1.1%. The dry heat shrinkage of the uncrimped drawn tow at 196C. was 6.5%. The cross-sectional measurements for the filaments were A/B 2.04; r /R 0.33; r /r 1.64; and d/2r 0.77. After passing through the stuffer-box, the filaments had 9 crimps per inch. The filament denier was 4.7. The cut staple fibers were 1.25 inches long. The filaments were stock-dyed to produce a gray color. The dyeing conditions were otherwise the same as in Example I and no after-scour was used. The fabric was finished in a manner similar to Example I. The fabric was similar in aesthetic appeal. Properties of the fabric are shown in Table 2. The fabric had a non-tacky hand despite the presence of trimer as shown by 1.0% extractable material.

EXAMPLES IIl-VI Several different types of spinneret and melt spinning conditions were employed to make several types of filament with scalloped oval cross-section. These filaments were processed as in Examples I and II. Sliver knit fabrics were prepared. The filament cross-sectional measurements and properties of the fabrics are described in Table 3. It will be noted that all of the fibers in Table 3 except the one designated Example V produced acceptable fabrics. The fiber of Example V had a ratio of d/2r of 1.08, which is outside of the invention, and the pile fabric of Example V had a tacky hand. The pile fabrics of Examples 111, IV and VI had a non-tacky, soft and resilient hand. It was found that the fibers of Exampls III, IV and VI fibrillated less than a trilobal polyester fiber having a modification ratio (as defined in Holland US. Pat. No. 2,939,201) of 1.8 and the same denier per filament.

EXAMPLE VII Another sliver knit fabric was prepared having a pile surface composed of 50% by weight of the 3.4-denier fibers of Example 111 and 50% of 14-denier fibers of 2- inch length wherein A/B was 1.79; r /R was 0.32; r /r was 1.24; and d/2r was 0.78. The 3.4-denier fibers were dyed an off-white beige shade and the 14-denier fibers were dyed a dark brown. The fabric was knit and finished as in Examples 1 and 11, but was sheared to 11-inch pile height. The finished fabric had a pleasing luster, and a soft, resilient, non-tacky hand. The 14 dpf fibers, being longer, were more prominent at the surface of the pile, and the resulting fabric was similar in appearance to natural furs. The 14 dpf fibers served as guard hairs, being similar to the guard hairs of natural furs in appearance and in feel.

PROPERTIES OF SYNTHETIC FURS PREPARED IN EXAMPLES I AND 11 Ex. I Ex. 11

Total fabric weight, oz/yd 14.8 14.0 Shaved pile weight 10%, 6.8 6.5 oz/yd Weight of knit backing, oz/yd 8.0 7.5 Fabric thickness in finished state (after latexing). inches 0.44 0.49 Weight loss in Wyzenbeeck abrasion, after 50 cycles/after 0.47/.74 0.60/1.1O 10 X oz/yd cycles Extractable with carbon tetrachloride, by wt. of dyed 0.85 1.0 staple TABLE 3 DATA FOR PILE FIBERS 0F EXAMPLES 111 TO V1 EXAMPLES 111 IV V VI Denier per filament 3.4 3.3 3.4 2.7 A/B 1.64 1.59 1.74 1.60 n/R 0.35 0.40 0.38 0.35 r lr 1.01 1.08 1.38 1.26 d/2r 0.71 0.87 1.08 0.92

I claim:

1. A polyester filament of 2 to 14 denier having an oblong cross section, continuously along its length, characterized as follows:

a. By major and minor axes of symmetry which are perpendicular to each other;

b. By a ratio of length A to width B, measured along the axes of symmetry, of from 1.4 to 2.4;

c. By a lobe located on each extremity of the major axis which has a tip radius ratio r,/R of 0.20 to 0.45, where r, is the radius of the lobe tip and R is the radius of a circle circumscribed about the oblong cross section;

d. By a lobe located on each extremity of the minor axis which has a tip radius ratio r /R of 0.8 to 2.1 times the tip radius ratio r,/R of the lobes on the major axis;

e. By indentations between the lobes on the major and minor axes; and

f. By the shortest distance d between two indentations on opposite sides of the major axis being from 1.2 to 2.0 times the radius r, of the lobes on the major axis.

Patent Citations
Cited PatentFiling datePublication dateApplicantTitle
US2149425 *5 Apr 19357 Mar 1939Draemann MaxRubber thread and method of making same
US2831748 *25 Feb 195322 Apr 1958British CelaneseProcess for melt spinning crimped filaments
US3109220 *19 Aug 19605 Nov 1963Du PontTetralobal cross-sectioned filaments
US3156607 *31 May 196110 Nov 1964Du PontLobed filament
US3219739 *27 May 196323 Nov 1965Du PontProcess for preparing convoluted fibers
US3238553 *9 Apr 19648 Mar 1966E B & A C Whiting CompanyFilamentary articles
US3239865 *24 Mar 196515 Mar 1966E B & A C Whiting CompanyBrush containing polypropylene bristles
US3249669 *16 Mar 19643 May 1966Du PontProcess for making composite polyester filaments
US3344457 *25 Jul 19663 Oct 1967RhodiacetaPaintbrushes
US3351205 *18 May 19627 Nov 1967Lindsay Wire Weaving CompanyTwisted strands and non-woven filtering media made of such strands
US3470685 *10 Oct 19677 Oct 1969Hercules IncSynthetic textile yarn
Referenced by
Citing PatentFiling datePublication dateApplicantTitle
US3981948 *2 Jan 197521 Sep 1976Eastman Kodak CompanyArrangements in spinnerets of spinning orifices having significant kneeing potential
US4245001 *7 May 197913 Jan 1981Eastman Kodak CompanyTextile filaments and yarns
US4316924 *12 Mar 198023 Feb 1982Teijin LimitedSynthetic fur and process for preparation thereof
US4332585 *20 Aug 19801 Jun 1982Teijin LimitedSynthetic fur and process for preparation thereof
US4332761 *2 Oct 19801 Jun 1982Eastman Kodak CompanyProcess for manufacture of textile filaments and yarns
US4405686 *7 Jun 198220 Sep 1983Teijin LimitedCrimpable conjugate filamentary yarns having a flattened cross-sectional configuration
US4416934 *31 Mar 198122 Nov 1983Teijin LimitedWoven or knitted polyester multifilament fabric
US4562029 *31 Jan 198531 Dec 1985Celanese CorporationSelf-crimping polyester yarn
US4620859 *14 Feb 19864 Nov 1986Owens-Corning Fiberglas CorporationMethod for making coalesced mineral fibers
US4622054 *14 Feb 198611 Nov 1986Owens-Corning Fiberglas CorporationMethod and apparatus for making non-circular mineral fibers
US4634625 *25 Oct 19846 Jan 1987E. I. Du Pont De Nemours And CompanyNew fabrics, yarns and process
US4636234 *14 Feb 198613 Jan 1987Owens-Corning Fiberglas CorporationMethod and apparatus for making non-circular mineral fibers
US4661404 *26 Sep 198528 Apr 1987Celanese CorporationSelf-crimping polyester yarn
US4666485 *26 Dec 198519 May 1987Owens-Corning Fiberglas CorporationMethod and apparatus for making tapered mineral and organic fibers
US4707407 *27 Mar 198617 Nov 1987E. I. Du Pont De Nemours And CompanySynthetic water-dispersible fiber
US4720314 *15 Dec 198619 Jan 1988Celanese CorporationProcess for producing self-crimping polyester yarn
US5106457 *20 Aug 199021 Apr 1992James River CorporationHydroentangled nonwoven fabric containing synthetic fibers having a ribbon-shaped crenulated cross-section and method of producing the same
US5141811 *21 Nov 199025 Aug 1992Teijin LimitedElastic synthetic polymer filament with multi-lobated cross-sectional profile
US5626961 *3 May 19966 May 1997E. I. Du Pont De Nemours And CompanyPolyester filaments and tows
US5723159 *20 Mar 19963 Mar 1998Eastman Chemical CompanySpinnerets for making fibers capable of spontaneously transporting fluids
US5733490 *20 Mar 199631 Mar 1998Eastman Chemical CompanyProcess for helically crimping a fiber
US5736243 *12 Jun 19967 Apr 1998E. I. Du Pont De Nemours And CompanyPolyester tows
US5753166 *21 Oct 199619 May 1998Eastman Chemical CompanyProcess of making a non-circular cross-sectional fiber
US5817740 *17 Dec 19976 Oct 1998E. I. Du Pont De Nemours And CompanyLow pill polyester
US5834119 *3 Jan 199710 Nov 1998E. I. Du Pont De Nemours And CompanyFilament cross-sections
US5855798 *20 Mar 19965 Jan 1999Eastman Chemical CompanyProcess for spontaneouly transporting a fluid
US5922366 *26 Feb 199713 Jul 1999E.I. Du Pont De Nemours And CompanySpinnerets with diamond shaped capillaries
US5938648 *3 Dec 199717 Aug 1999The Procter & Gamble Co.Absorbent articles exhibiting improved internal environmental conditions
US5972505 *23 Jul 199126 Oct 1999Eastman Chemical CompanyFibers capable of spontaneously transporting fluids
US6013368 *2 Apr 199811 Jan 2000E. I. Du Pont De Nemours And CompanyComfort by mixing deniers
US6037047 *26 Feb 199714 Mar 2000E. I. Du Pont De Nemours And CompanyIndustrial fibers with diamond cross sections and products made therefrom
US6037055 *8 Sep 199814 Mar 2000E. I. Du Pont De Nemours And CompanyLow pill copolyester
US6063980 *5 May 199816 May 2000E. I. Du Pont De Nemours And CompanyHigh comfort cast liner
US6147017 *26 Feb 199714 Nov 2000E. I. Du Pont De Nemours And CompanyIndustrial fibers with sinusoidal cross sections and products made therefrom
US61876963 Dec 199713 Feb 2001E. I. Du Pont De Nemours And CompanyBreathable composite sheet structure
US63717513 Jan 199716 Apr 2002E. I. Du Pont De Nemours And CompanySpinnerets with orifices for improved filament cross-sections
US6378161 *13 Aug 199930 Apr 2002Bmp Europe LimitedCleaning element
US641046519 Oct 199925 Jun 2002E. I. Du Pont De Nemours And CompanyComposite sheet material
US64136314 May 19982 Jul 2002E. I. Du Pont De Nemours And CompanyProcess of open-end spinning of polyester staple fiber
US645845522 Aug 20011 Oct 2002E. I. Du Pont De Nemours And CompanyPoly(trimethylene terephthalate) tetrachannel cross-section staple fiber
US667725825 Nov 199813 Jan 2004E. I. Du Pont De Nemours And CompanyBreathable composite sheet structure and absorbent articles utilizing same
US683533924 Jun 200228 Dec 2004E. I. Du Pont De Nemours And CompanyProcess for preparing poly(trimethylene terephthalate) tetrachannel cross-section staple fiber
US703629919 Dec 20022 May 2006Invista North America S.A.R.L.Stretch polyster/cotton spun yarn
US70815602 Jun 200025 Jul 2006The Procter & Gamble CompanyAbsorbent articles utilizing breathable composite sheet
US721484711 Jul 20008 May 2007Argentum Medical, L.L.C.Multilayer conductive appliance having wound healing and analgesic properties
US721948618 Aug 200422 May 2007Union Hill Corp.Moisture-wicking saddle pad
US723015329 Apr 200512 Jun 2007Argentum International, LlcMultilayer conductive appliance having wound healing and analgesic properties
US72404763 Oct 200510 Jul 2007Invista North America S.r.l.Stretch polyester/cotton spun yarn
US729176211 Sep 20036 Nov 2007Argentum International, LlcMultilayer conductive appliance having wound healing and analgesic properties
US73070317 Jan 200411 Dec 2007The Procter & Gamble CompanyBreathable composite sheet structure and absorbent articles utilizing same
US745481612 Jan 200525 Nov 2008E.I. Du Pont De Nemours And CompanyStretch break method, apparatus and product
US75591215 Jan 200514 Jul 2009E.I. Du Pont De Nemours And CompanyStretch break method and product
US782056024 Jul 200326 Oct 2010Propex Operating Company LlcTurf reinforcement mat having multi-dimensional fibers and method for erosion control
US798967430 Oct 20072 Aug 2011Argentum Medical, LlcMultilayer conductive appliance having wound healing and analgesic properties
US80436898 Dec 200525 Oct 2011Propex Operating Company LlcPyramidal fabrics having multi-lobe filament yarns and method for erosion control
US80934447 May 200710 Jan 2012Argentum Medical, LlcMultilayer conductive appliance having wound healing and analgesic properties
US811879131 Oct 200721 Feb 2012Argentum Medical, LlcMedical device
US82734248 Jul 200925 Sep 2012Tapijtfabriek H. Desseaux N.V.Artificial grass field
US82835136 Sep 20059 Oct 2012Argentum Medical, LlcMultilayer wound dressing
US829396429 Oct 200723 Oct 2012Argentum Medical, LlcMultilayer laminate wound dressing
US844951429 Oct 200728 May 2013Argentum Medical, LlcConductive wound dressings and methods of use
US8455710 *23 Apr 20034 Jun 2013Argentum Medical, LlcConductive wound dressings and methods of use
US850037213 Sep 20106 Aug 2013Propex Operating Company LlcTurf reinforcement mat having multi-dimensional fibers and method for erosion control
US851314629 Sep 200520 Aug 2013Invista North America S.r.l.Scalloped oval bicomponent fibers with good wicking, and high uniformity spun yarns comprising such fibers
USRE4153931 Jan 200817 Aug 2010The Procter & Gamble CompanyBreathable composite sheet structure and absorbent articles utilizing same
EP0198400A19 Apr 198622 Oct 1986E.I. Du Pont De Nemours And CompanyNew synthetic water-dispersible fiber
WO1984000179A1 *20 Jun 198319 Jan 1984Eastman Kodak CoFracturable fiber cross sections
WO1986006111A1 *8 Apr 198623 Oct 1986Du PontNew synthetic water-dispersible fiber
WO1997002372A1 *26 Jun 199623 Jan 1997Du PontNew polyester tow
WO1997002373A1 *26 Jun 199623 Jan 1997Du PontImprovements in polyester filaments and tows
WO1997002374A1 *26 Jun 199623 Jan 1997Du PontNew polyester tows
WO1998029584A1 *17 Dec 19979 Jul 1998Du PontImprovements in filament cross sections
WO2002022926A1 *27 Aug 200121 Mar 2002Du PontPoly(trimethylene terephthalate) tetrachannel cross-section staple fiber
Classifications
U.S. Classification428/397, 15/207.2, 264/177.13
International ClassificationD01D5/253, D03D27/00, D01F6/62
Cooperative ClassificationD10B2501/044, D01D5/253
European ClassificationD01D5/253