TREATMENT OF VAL OF DIRT FOR CALCETIM? S ABSORBENT OF MOISTURE
FIELD OF THE INVENTION The present invention relates to hosiery, and especially to socks, treated with a soil val composition. The treated socks are made of yarns comprising polyester and blends of polyester with cotton and other fibers. More particularly treated socks comprise yarns of high moisture absorption capacity composed of thin filaments of a cross section that allow the movement of moisture. BACKGROUND OF THE INVENTION Compositions for the treatment of fabrics are known to prevent properties of re-deposition of dirt. Such compositions are known from the Patent
European Number EP1225269 Bl assigned to CIBA Specialty
Chemicals These compositions proved effective when used with cotton-containing textiles of 30 to 100% in blends with polyester or with polyamides. Pure synthetic fibers of polyester or polyamide are also usually treated by such compositions. Here the benefit sought is one of improved retention of white color in multiple wash cycles, together with hydrophilicity and dirt val. High moisture absorption capacity yarns such as those sold under the brand COOLMAX® (INVISTA S. RE .: 187094
r.1.), comprise fine polyester filaments with special cross sections designed to achieve improved moisture movement properties. Such threads are widely used in hosiery, especially in socks. Frequently combined with other yarns such as cotton, along with nylon and spandex portions, these yarns fill a niche in the manufacture of white athletic socks. A deficiency of fabrics comprising special cross-section fibers is a dirty appearance, or less "white" appearance with time after repeated home washes. This appearance of poor color, lack of retention of novelty over time with numerous uses and washes is noted by consumers and causes some returns of goods to retail stores. Due to the high retention of white appearance required for athletic socks after repeated consumer use, treatments have been sought to improve the val of dirt. Such treatments were sought especially for clothing and for socks woven of polyester fiber composite yarns having specialized transverse cuts in improved moisture movement. Socks of this type sold under the COOLMAX® brand pass strict moisture management criteria to meet brand requints. The potential added value for socks of this type can be derived from its
improved maintenance of a white appearance. Thus, there is a need to develop an improved footwear product that meets both of the industry's high moisture management standards while improving color and novelty retention. SUMMARY OF THE INVENTION The invention provides a treated garment comprising at least 50% polyester multiple filament yarns. The multiple filament yarns are composed of filaments having a single filament cross section. The treated garment is provided with a treatment with a durable dirt val composition containing fluorine. The treated garment is characterized by an absorbent height of at least 75 millimeters in accordance with a vertical water absorption test method, a dirt val rate of at least 3, when measured by Test Method 130-2000 of AATCC (for its acronym in English American Association of Textile Chemists and Colorists), and at least a unit improvement of 1.0 in the re-deposition of dirt in accordance with the method of proof of re-deposition of dirt here provided. The further treated garment may comprise a yarn balance selected from yarns comprising individual non-profiled filaments selected from natural cotton and fibers from synthetic polymers: polyester, polyamide and spandex yarns.
The treated garment can further comprise a sock or at least a pair of socks. Further provided according to the invention is a method for treating garments comprising at least 50% polyester multiple filament yarns composed of filaments having a single filament cross section, and comprising the steps of: permanent dirt removal containing fluorine in an aqueous depletion bath to more than 5% based on weight of garments and less than 50 garments to a bathing ratio; stop the treatment bath without an intervention rinsing step; drying clothes in a dryer or the equivalent of an automatic dryer; and curing garments while individually treated at a temperature between 110 ° C and 190 ° C for a period of time from about 60 to about 90 seconds. DETAILED DESCRIPTION OF THE INVENTION In accordance with one aspect of the invention, applicants found that a durable fluoride-containing soil removal composition applied to a final moisture treatment on garments comprising a majority of profiled cross-section filament yarns promotes the whiteness retention of garments and the new appearance after extended washing cycles. A durable dirt removal composition containing effective fluoride for this
The treatment procedure is SRM ZONYL® (CIBA SPECIALITY CHEMICALS, Textile Effects, 3400 Westinghouse Boulevard, Charlotte, North Carolina 28241, E.U.A.). The garments for which the inventive process is most effective and comprise a high content of polyester multiple filament yarns. The balance of yarns with less than 100% polyester also comprises portions of cotton, polyamide yarns (for example, nylon 66 and nylon 6), polyester and spandex circular cross-cut filament yarns (for example LYCRA® and LYCRA® T400). A high content means greater than or equal to 50% and up to 100% polyester content. The filaments of these very effectively treated polyester yarns comprising profiled filaments. Here, the profiled filaments mean that they have a non-circular cross-sectional shape as seen normal for the long axis of the filament. One such type of profiled filament is found in COOLMAX® yarns (INVISTA, S.a r.1, Three Little Falls Center, 2801 Centerville Road, Willmington, Delaware 19808 E.U.A.). COOLMAX® yarns have a special cross section that provides "4 channels" in each filament and are known for highly effective moisture absorbing properties due to the presence of these channels. The fabrics of these threads can assume a dirty appearance, or less "white" appearance with time after repeated home washes. The procedures here and the products
treated accordingly, in contrast, they do not have this appearance of poor color or lack retention of novelty over time with numerous uses and washes. More generally, this invention provides a treated garment comprising at least 50% polyester multiple filament yarns (synthetic polymer of polyethylene terephthalate). The multiple filament yarns are composed of filaments having a single filament cross section. The treated garment is treated with the durable fluoride-containing dirt removal composition, SRM ZONYL®. The treated garment is characterized by an absorbent height of at least 75 millimeters in accordance with a vertical water absorbing test method, a dirt removal rate of at least 3, when measured by the AATCC Test Method 130-2000 , and at least one unit improvement of 1.0 in re-deposition of dirt in accordance with the dirt re-deposition test method provided herein. The treated garment can further comprise a yarn balance selected from natural cotton yarns; single filament non-profiled polyester, polyamide and spandex yarns. The treated garment can further comprise a sock or at least a pair of socks. More generally, the treatment here is provided for socks that have a visual aesthetic of mostly white color.
The method, provided according to the invention, treats garments comprising at least 50% polyester multiple filament yarns composed of individual profiled filaments and comprises the steps of: applying a lasting dirt removal treatment containing fluorine in a bath from water depletion to more than 5% based on weight of garments and less than 50 garments in relation to bathing; stop the treatment bath without an intervention rinsing step; drying clothes in a dryer or the equivalent of an automatic dryer; and curing garments while individually treated at a temperature between 110 ° C and 190 ° C for a period of time from about 60 to about 90 seconds. This procedure is effective in promoting whiteness retention after extended wash cycles. The whiteness retention property was demonstrated by using a standard washing protocol and a standardized synthetic "dirt". The test method measures the property of the treated fabrics to appear clean and not dirty without re-deposition of dirt on the fabric of the wash water. The treated garments also satisfy a dirt removal requirement of at least 3 when measured by the AATCC Test method 130-2000. The treated garments also meet a strict requirement for retention of "whiteness" during the "boarding" or curing process and a standard of humidity management
strict. The humidity management standard is measured by a moisture absorbent height of 125 mm (5 inches) and a 5 square centimeter propagation area known in the art for this category of hosiery product (sock). In addition, the retention of the benefits of this fabric treatment is durable. Durable means that the treatment benefit persists after extended wash cycles that use standard dirt removal tests. Generally, these dirt removal tests are based on re-deposition of dirt, and the removal of corn oil and mineral oil from the fabric of the garment. Test methods Oil repellency Oil repellency rates were determined in accordance with Standard Test Method 118-2002 of the
American Association of Textile Chemists and Colorists
(AATCC). Oil repellency was tested by placing droplets of hydrocarbon liquids of varying surface stresses on the fabric, then visually determining the extent of surface moisture. This test determines how well-finished fabrics resist oily stains and wetting by organic liquids. Generally, the higher the oil repellency index, the better the resistance of the finished fabric to dirt by oily substances. Standard test fluids are listed in the
Table 2. Table 2. Standard Oil Repellency Test Liquids
Different types of wetting can be found, depending on the finish, fiber, or construction of the fabric. With many fabrics, the end point index is obvious because the fabric will fully resist wetting by a test liquid, but will allow immediate penetration by the next liquid. However, with some fabrics, determining endpoint can be difficult. These fabrics will show progressive wetting by several test liquids, as shown by a partial darkening of the cloth in the liquid / cloth interface. In black or dark fabrics, wetting can
Detected by a loss of "brightness" inside the drop. For fabrics where the end point is difficult to determine, the end point is considered to be the test liquid that causes complete darkening at the interface within 30 seconds. The cloth samples were placed face up on white blotting paper that rested on a flat horizontal surface. Drops of standard test liquid, which start with the test liquid that has an index of 1, were applied to the test fabric in five locations. Each drop was approximately 5 mm in diameter or 0.05 milliliters in volume. The drops were observed for 30 seconds from an angle of approximately 45 °. If at least three of the five drops were not observed to wet or penetrate the fabric and showed no absorption around the droplets, the test was repeated at an adjacent site using the test liquid that has an index of 2. The procedure continued until at least three of the five drops wetted or showed absorption on the fabric within 30 seconds. The AATCC oil repellency index of the fabric was determined to make the above listed liquid for which at least three of the five drops did not wet or absorb into the fabric. Half-point indices may be provided, for example 4.5 for an edge step in the test liquid 5. An example of an edge step is where three or more of the five drops are round, however there is a partial darkening of the edge.
specimen around the edge of the drop. In the United States of America, a commonly accepted level of oil repellency is an index of 3. dirt removal index The AATCC soil removal rate was determined in accordance with a Standard Test Method 130-2000 of the American Association of Textile Chemists and Colorists (AATCC). The fabric samples were placed flat on the new AATCC Textile Absorbent paper on a smooth, horizontal surface. Five drops (0.2 milliliters total) of MAZÓLA® Corn Oil (ACH Food Companies Inc.) were placed on the cloth surface creating an individual dot. A sheet of glass paper was placed in the puddle of oil, and then a weight of 2.27 kg (5 pounds) was placed directly on the glassine paper for 60 seconds. The weight and the glass paper were removed, and the fabric sample was then washed for 12 minutes in the normal wash cycle with high water level in an automatic KENMORE® using 100 grams of AATCC Standard Reference Detergent WOB 1993 . The washing temperature was 60 ° C, the rinse temperature was cold. The total weight of the load was 4 pounds. After the final centrifugation cycle, the total load was placed in a KENMORE® automatic dryer and dried at high speed for 45-50 minutes. The dirt removal rates are
determined by placing the dirty, washed, and dried cloth flat in the center of an opaque paved table with an edge of the table that touches a Replica of Dirt Removal (order number 08379, available from the AATCC). The fabric was observed from a distance of approximately 76 centimeters (30 inches) and the residual dirt was compared with the Replica of Dirt Removal at the nearest 0.5 index. The indexes were given from 1 (minimum) to 5 (maximum). In the United States of America, a commonly accepted level of soil removal is an index of 3. Absorption test method The moisture absorption of the yarns of the invention was determined by known methods, such as by a vertical absorption test or a horizontal absorption test. The vertical absorption test can be conducted by weaving the wires in tubes, and then carving or treating the tubes with any desired agent and allowing the treated tubes to air dry. The tubes are then cut into strips 1 inch (25.4) wide about 8 inches (203 mm) long and suspended vertically over the water with 3 inches (75 mm) in the water and 5 inches (125 mm) above the water. Water. Observations of the height of the water absorbed by the bands were visually conducted at predetermined times, such as 1 minute, 5 minutes, 10 minutes, 20 minutes and 30 minutes.
Percent of individual fluorine by weight of fabric The percent by weight of fabric for fluorine, represented as% eptF, was determined as follows. The fluorine in the fabric, represented here as FTELA, was measured by the well-known Wickbold torch method in parts per million (ppm). This value was then divided by the weight percent of fluorine in the fluorochemical, represented as FFQ to obtain the weight percent of fabric fluorine for that fluorochemical:
When more than one fluorochemical is used, the weight percent of total fluorine in the fabric is obtained by adding the individual fluorine weight percent of cloth values for all the fluorochemicals used. Washing of dirt re-deposition When using a "Lab-Line" extractor mixer, prepare a 1% or 2% dispersion solution of DuPont Standard Dry Dirt in 1 liter (L) of deionized water (DI) at room temperature. ambient. Cut fabric samples 75 mm by 75 mm (3 inches by 3 inches). Add the dirt solution to the decanting funnel and place the fabric samples in the funnel, up to 6 samples per funnel. By shaking for 15 minutes at a setting of 20 cycles per minute. Drain the solution of dirt in a 1 L laboratory beaker and discard. Rinse the funnel with deionized water (DI) to remove residual dirt in the
sides of the funnel and drain. Add 1 L of DI water at 40 ° C to the separating funnel. Add 2.1 grams of TIDE® Powder Free Detergent. Stir for 15 minutes at a speed setting of 20 cycles per minute. Drain the wash water in a laboratory glass from an L and discard. Add 1 L of DI water at 40 ° C to the funnel and stir for 10 minutes in the speed setting of 20 cycles per minute. Drain the rinse water and discard. Add 1 L of DI water at room temperature and stir for 10 minutes in the speed setting of 20 cycles per minute. Drain the rinse water and discard. Remove the samples and squeeze to remove excess water. Air dry for a minimum of 8 hours or until dry. Evaluate the samples in accordance with the Grayscale, Evaluation Procedure 2 of the AATCC. The procedure to disperse "dry dirt" in water. The dispersed DuPont Soil solution was made by using a Szegvari Attritor System of Search Model 01. A solution of 80% water / 20% DuPont Dry Soil was made. The process uses 2 pounds of 2 mm zirconium silicate spray media at an operating pressure of 40 psi and an axle speed of 600 rpm for two hours.
DuPont Standard Dry Dirt * Component CAS Number% Weight
Sphagnum moss - 38 Cement 65997-15-1 17 Kaolin clay, unmatched 1318-74-7 17 Amorphous silica 7631-86-9 17 Mineral oil 8012-95-1 8.75
Carbon Black 1.75
Red Iron Oxide 1309-37-1 0.50 ** DuPont Standard Dry Dirt can be purchased from Teaetile Innovators Corporation, 101 Forest St., Windsor, NC 27983, E.U.A. (252-794-9703) -Prepastic synthetic dirt in accordance with the AATCC method for carpet dirt testing. EXAMPLES In an example of the invention the sock samples are woven using the following construction details: 80% COOLMAX® (Type 729W) and 20% coating yarn consisting of LYCRA® (902C) double 120 denier coated with 34 nylon 66 66 denier filaments plus 13 nylon 66 40 denier filaments in the sock cover, and 18 denier LYCRA® covered with air injection with 2 strands of 66 66 nylon filaments of 70 denier in the foot of the sock. In a comparative example, the sock samples
were woven using the following construction details: 63% COOLMAX® (Type 729W) in a 50/50 cotton blend and 37% LYCRA® 18 denier spandex liner yarns covered with 2-wire air injection of 2 strands of 68 filament 66 nylon filament wire of 70 denier. All illustrative socks of the invention were finished in accordance with the following protocol: first a pre-cut for 15 minutes at 70 ° C with 0.5 grams / liters of Merol HCS (from Stepan CO, 22 West Frontage Road, Northfield, Illinois 60063 ); 0.5 g / 1 trisodium phosphate and 0.5 g / 1 Lubi t 64 (Lanxess Corp. 111 RIDC Park West, Pittsburgh, Pennsylvania); then rinse with water (2 times); add water at a ratio of 40/1 liqueur; add SRM ZONYL® based on a minimum of 5% (up to 10%) by weight of goods (pledge weight); adjust pH to 5.5 with acetic acid; heat the bath to 43 ° C and maintain 20 minutes with agitation; stop the bath-do not rinse the clothes and then dry in machine. When using standard boarding techniques, garments are individually treated at 160 ° C within 90 seconds to ensure product healing in the garment. All the illustrative comparative socks were finished in accordance with the following protocol: first a pre-cut for 15 minutes at 70 ° C with 0.5 grams / liter of Merol HCS, 0.5 grams / liter of trisodium phosphate and 0.5 g / 1 of
Lubi t 64; add PERMALOSE ™ to 3%; adjust the pH to 0.6 with acetic acid; heat the bath to 60 ° C and keep for 10 minutes with stirring; stop the bathroom; do not rinse the garments and then dry in machine. By using standard boarding techniques, garments were individually addressed at 140 ° C for 60 seconds. Both the illustrative comparative socks and the invention meet the moisture absorption specifications for vertical water rinsing, at least 75 mm. Dirt indices are given in the following Tables 1 and 2. The Gray Scale indices indicate relative "dirt" of a white sock. In both cases where the examples of the invention were treated with SRM ZONYL® and challenged with a dirt test of 1% or 2% dirt, the examples of the invention were superior to the comparative examples. Table 1
It is noted that in relation to this date, the best method known to the applicant to carry out the aforementioned invention, is that which is clear from the present description of the invention.