CN115552061A

CN115552061A - Elastic fiber with anti-sliding property, composite yarn and fabric

Info

Publication number: CN115552061A
Application number: CN202180020387.5A
Authority: CN
Inventors: 廖添益; N·E·库尔兰德; 刘洪�; 黄玉成
Original assignee: Lycra Uk Ltd
Current assignee: Lycra Uk Ltd
Priority date: 2020-03-11
Filing date: 2021-03-10
Publication date: 2022-12-30
Also published as: EP4118261A1; KR20220146651A; BR112022017945A2; US20230087881A1; MX2022011067A; WO2021183609A1; TW202200861A; JP2023517945A

Abstract

The present invention provides elastic fibers having improved resistance to seam slippage. Also provided are elastic composite yarns, fabrics, and articles comprising the elastic fibers, and methods of production of the processes for making spandex (spandex) fibers, composite yarns, fabrics, and articles with improved spandex (elastane) slippage resistance.

Description

Elastic fiber with anti-sliding property, composite yarn and fabric

Technical Field

The present disclosure relates to the manufacture of elastomeric fibers (elastomeric fibers), composite yarns, and fabrics with improved resistance to seam slippage. More specifically, the present disclosure relates to elastomeric fibers having anti-slip polymeric additives, and elastomeric composite yarns, fabrics, and articles comprising the elastomeric fibers.

Background

Stretch fabrics with elastic composite yarns have been marketed for many years in many applications. Fabric and garment manufacturers generally know how to manufacture fabrics with the correct quality parameters to achieve a consumer acceptable fabric. However, spandex fiber slippage typically occurs during garment manufacture or consumer home laundering. This slippage of spandex fibers has become one of the major quality complaints of consumers and one of the main causes of return of goods in department stores and brand clothing.

Elastomeric fibers, commonly known as spandex, are typically covered with a stiff yarn when used in woven fabrics. Slippage of these yarns, commonly referred to as elastane (spandex) yarns, occurs as the spandex yarns slip off of the sewn seam, resulting in a loss of elasticity in the area over which the spandex yarns have slipped. Sometimes, there is no visual indication that slippage has occurred. However, in general, slippage can be observed as the white bare spandex yarn whiskers stick to the surface of the fabric. This slippage is therefore particularly evident on dark fabrics. Slippage can also be observed as bubbles and/or wrinkles appear between areas of fabric still having spandex and areas of fabric without spandex. FIG. 1 is a photograph of a defective garment having such seam slippage problems.

To produce fabric stretch and recovery, the elastic fibers are processed under tension (that is, in a stretched state). During the manufacture of composite drawn yarns for weaving, spandex is drawn to about three times its original length while being covered with companion fibers.

During the entire weaving, dyeing and finishing process, the elastic fibers try to relax; however, even after finishing, the elastic fiber is still under slight tension. Sometimes, this tension causes the elastic fibers to slip from the cut edges of the fabric through the sewing thread. See fig. 2. This slippage is particularly problematic in portions of the garment where the fabric is under significant tension, such as the crotch or other tight areas. Slippage also occurs when the laundry is wet processed at high temperatures and high mechanical action. Even more problematic is that spandex slippage does not occur during fabric and garment manufacture, but rather after several home laundering cycles.

Seam slippage can be caused by a variety of factors and although it can be controlled by following the conditions associated with fabric construction, cutting and sewing techniques, yarn drafting and twisting levels, heat-setting conditions; the recommended procedures relating to yarn selection, wet processing conditions and the use of softeners are reduced to a certain extent, but spandex slippage still occurs randomly, especially for loose fabrics with a high degree of stretch and with polyester and rayon (rayon) staple fibers.

Composite elastic yarns are well known. For example, U.S. Pat. nos. 4,470,250;4,998,403;7,134,265; and 6,848,151 discloses elastomeric fibers (such as spandex) that are covered with relatively inelastic fibers in order to facilitate acceptable knitting or weaving processes, and to provide elastic composite yarns with acceptable properties for use in various end use fabrics. Published U.S. patent application No. 2008/0268734A1 and published U.S. patent application No. 2008/0318485A1 disclose a rigid filament for use as a core in a core spun yarn along with an elastic filament.

WO 2010045637A2 discloses a meltable bicomponent spandex for slip prevention in knitted fabrics.

There is a need for elastomeric fibers with good slip resistance properties that anchor well and prevent slipping from the seams of a garment.

Disclosure of Invention

The present disclosure provides elastomeric fibers, and composite yarns, fabrics, and articles comprising elastomeric fibers that exhibit improved resistance to spandex slippage, ease of stretching, ease of processing, low shrinkage, ease of garment manufacture, excellent recovery power, and low growth.

One aspect of the present invention relates to an elastomeric fiber having improved seam slip properties comprising a polymeric additive having a glass transition below 100 ℃. In one non-limiting embodiment, the elastomer is spandex. In one non-limiting embodiment, the polymeric additive is a polyurethane or derivative thereof comprising bis (4-isocyanatocyclohexyl) methane and N-alkyldiethanolamine. In another non-limiting embodiment, the polymeric additive is a long side chain copolymer comprising the reaction product of polystyrene and maleic anhydride.

Another aspect of the invention relates to an elastomeric composite yarn comprising anti-slip elastomeric fibers. In one non-limiting embodiment, the elastomer composite yarn comprises a core comprising anti-slip elastomeric fibers surrounded, twisted, or intertwined in the surface of the yarn by hard fibers that serve to protect the elastomeric fibers from abrasion during the textile process and help stabilize the elastic behavior of the elastomeric fibers. The composite yarns of the present invention may include, but are not limited to, single wrapping the elastomeric fiber with a hard yarn; double wrapping the elastomer with hard yarn; continuously coating (that is to say core spun/core-spinning) elastomeric fibres with short fibres, then twisting during winding; interlacing and entangling the elastomer and the hard yarn by using an air jet; and twisting the elastomeric fibers and the hard yarn together.

Another aspect of the invention relates to a woven stretch fabric having warp and weft yarns and comprising a composite yarn comprising anti-slip elastomeric fibers. In one non-limiting embodiment, the composite yarn comprises a sheath of at least one hard fiber and a core comprising a slip resistant fiber.

Another aspect of the invention relates to articles comprising elastomeric fibers or composite yarns or fabrics containing the elastomeric fibers having improved seam slippage properties. In one non-limiting embodiment, the article is a garment.

Yet another aspect of the present invention relates to methods for making elastomeric fibers, composite yarns, fabrics, and articles having improved resistance to spandex slippage. In these methods, a polymeric additive having a glass transition below 100 ℃ is added to the elastomeric fibers. In one non-limiting embodiment, the elastomer is spandex. In one non-limiting embodiment, the polymeric additive is a polyurethane or derivative thereof comprising bis (4-isocyanatocyclohexyl) methane and an N-alkyldiethanolamine. In another non-limiting embodiment, the polymeric additive is a long side chain copolymer comprising the reaction product of polystyrene and maleic anhydride.

Drawings

FIG. 1 is a photograph of a defective garment having seam slippage.

Figure 2 is an illustration of an elastic wrap yarn with slip.

Fig. 3 (a), 3 (B), 3 (C), 3 (D) and 3 (E) are schematic views of various elastic composite yarns.

Fig. 4A and 4B are chemical structures of non-limiting examples of polymer additives for use in the present invention. FIG. 4A is a polyurethane comprising bis (4-isocyanatocyclohexyl) methane and N-alkyldiethanolamine, wherein R represents-CH ₃ 、-CH ₂ CH ₃ 、-CH ₂ CH ₂ CH ₃ 、-CH ₂ CH ₂ CH ₂ CH ₃ 、-C(CH ₃ ) ₃₃ Or other alkyl groups having 18 carbons or less. In fig. 4B, R1 represents NH or O group; r2 represents an alkyl or alkenyl, linear or branched C4-C22 group; and M represents a monomer copolymerizable with maleic anhydride, including but not limited to styrene, substituted styrene, ethylene, vinyl acetate, propylene, butadiene, octadecene, acrylamide, acrylonitrile, acrylates, methacrylates, vinyl chloride

Fig. 5 is a schematic view of a core-spun apparatus.

Fig. 6 is a Differential Scanning Calorimetry (DSC) curve of the additive PSC 18.

Fig. 7 is a DSC curve of additive 2PSC 18.

Detailed Description

The present invention relates to elastomeric fibers, and composite yarns, fabrics, and articles comprising elastomeric fibers that exhibit improved resistance to spandex slippage, easy stretch, easy processing, low shrinkage, easy garment manufacture, excellent recovery, and low growth.

More specifically, the present invention relates to anti-slip elastomeric fibers comprising an elastomer and a polymer additive having a glass transition temperature of less than 100 ℃. The invention also relates to elastic composite yarns comprising the anti-slip elastomer fibers. The invention relates to stretch woven fabrics also comprising such elastic composite yarns. The fabrics are substantially free of spandex slippage and have a desirable combination of stretch, soft hand, excellent comfort when worn, dimensional stability, and natural fiber look and feel (feel). The invention also relates to a process for making such fibers, yarns and fabrics, and to garments comprising the fabrics of the invention.

As used herein, the term "seam slippage" or "spandex slippage" refers to the situation where the elastomeric fiber (such as, but not limited to, spandex) does not remain anchored and slips backwards in the seam area at the cut end of the yarn. Thus, at one end of the yarn there is no longer any spandex fiber, since it has been retracted axially inside the bundle and the fabric. After the spandex fiber slips out of the seam, it creates a baggy/wavy fabric appearance and/or inelastic zones near the seam line.

As used herein, the terms "improved" and "reduced" when referring to seam slippage or spandex slippage mean that the length of an elastomeric fiber slippage comprising an anti-slippage additive according to the present invention is reduced compared to the length of the same elastomeric fiber slippage without the anti-slippage additive.

As used herein, the term "anti-slip" when used with respect to a fiber means that the spandex of the fiber exhibits resistance to any back-slipping from the cut edge of the yarn in the seam area.

As used herein, the term "rigid" or "hard" refers to a substantially inelastic fiber or yarn. Examples of rigid or hard fibers include, but are not limited to, polyester, cotton, nylon, rayon, and wool, and any combinations thereof.

Elastomeric (Elastomeric) or Elastomeric (elastomer) fibers are used interchangeably herein. Elastomers are polymers having rubber-like elasticity. The term encompasses a wide range of materials. "Elastomeric" (Elastomeric) is an adjective for an elastomer (elastomer). Elastomeric (Elastomeric) or Elastomeric (elastomer) fibers include Elastomeric polymers. These fibers are commonly used by those skilled in the art to provide stretch and elastic recovery in fabrics and garments. An "Elastomeric" or "Elastomeric" fiber is a continuous filament (optionally a coalesced multifilament) or a plurality of filaments without diluent, having an elongation at break of more than 100%, independent of any crimp (crimp). The elastomeric fiber is stretched to twice its length at (1); (2) keeping for one minute; and (3) upon release, retract to less than 1.5 times its original length within one minute of release. As used in the context of this specification, "elastomeric fiber" or "elastomeric fiber" means at least one elastomeric fiber or filament. Such elastomeric fibers include, but are not limited to, rubber filaments, biconstituent filaments (which may be predominantly rubber, polyurethane, etc.), draw-in-shoe (lastol), and spandex.

"spandex" is a manufactured fiber in which the fiber-forming substance is a long-chain synthetic polymer comprising at least 85% by weight of a segmented polyurethane. Because spandex fibers are predominantly segmented polyurethane elastomers, spandex fibers are a subclass of elastomeric fibers.

"elastoester" is a manufactured fiber in which the fiber-forming substance is a long-chain synthetic polymer comprising at least 50% by weight of an aliphatic polyether and at least 35% by weight of a polyester. Although not elastomeric, elastomeric esters may be included in certain fabrics herein.

"polyester bicomponent fiber" means a continuous filament comprising a pair of polyesters intimately adhered to one another along the length of the fiber, so that the fiber cross-section is, for example, side-by-side, eccentric sheath-core, or other suitable cross-section in which useful crimp can be developed. The polyester bicomponent filament comprises poly (trimethylene terephthalate) and at least one polymer selected from the group consisting of poly (ethylene terephthalate), poly (trimethylene terephthalate), and poly (tetramethylene terephthalate), or a combination of these members, having a hot set crimp contraction value after about 10% to about 80%.

The term "elastic fiber" refers to any fiber that can provide elasticity and recovery to a stretched fabric. Elastic fibers include "elastomeric fibers", "elastoester fibers", spandex, "polyester bicomponent filaments", and others as used herein.

A "composite yarn" is a composite yarn comprising two elastic fibers surrounded, twisted, or intertwined with rigid fibers. Rigid fibers are used to protect the elastic fibers from abrasion during the textile process. Such abrasion can lead to breakage of the elastic fibers and subsequent process interruptions and undesirable fabric non-uniformities. Furthermore, the coating helps stabilize the elastic behavior of the elastic fiber, and thus the elongation of the composite yarn can be more uniformly controlled during the textile process than would be possible with bare elastic fibers. The composite yarn may also increase the tensile modulus of the yarn and fabric, which helps to improve fabric recovery and dimensional stability. Various non-limiting examples of composite yarns are shown in fig. 3 (a) to 3 (E), including: FIG. 3 (A), continuous cladding (that is to say core-spun) of anti-skid spandex with short fibers, followed by twisting during winding; FIG. 3 (B) shows interlacing and entanglement of anti-slip spandex and hard yarn using a jet; FIG. 3 (C), single wrap of anti-slip spandex with hard yarn; FIG. 3 (D), double wrapping of anti-slip spandex with hard yarn; and FIG. 3 (E), the anti-slip spandex and the hard yarn are twisted together.

One non-limiting example of a composite yarn is a "core spun yarn" (CSY) which consists of a sheath of separable core spun fibers surrounded by a sheath of separable fibers. For example, in a cotton/anti-slip spandex core spun yarn, the core comprises anti-slip spandex and is covered with short cotton fibers.

As used herein, the term "fabric" refers to a knitted or woven material. The knitted fabric may be a plain knit, a circular knit, a warp knit, a fine elastic (narrow elastic), and a mesh. The woven fabric may be of any construction, such as satin (sateen), twill (twill), plain weave (plain weave), oxford weave (oxford weave), basket weave (basketweave), and fine elastics.

As used herein, "sequentially picking" means a weaving method and a weaving configuration in which one weft yarn comprising an anti-slip elastomer fiber and another weft yarn comprising a regular textile filament or staple fiber are woven in an alternating picking manner.

"Co-insertion" refers to a weaving process and a woven construction in which low melt fibers and regularly spun short or long weft yarns are woven in one and the same picking.

"outer penetration" is a term used to describe the exposure of bare anti-slip spandex filaments in a fabric. The term may also apply to composite yarns, in which case, outer penetration refers to the exposure of the core anti-slip spandex through the covering yarn. The outer transparency may manifest itself apparently as an undesirable glitter (glitter) or the tactile sensation as a synthetic feel or hand. The low external transmission on the front side of the fabric is better than the low external transmission on the back side of the fabric.

The inventors herein have surprisingly found that spandex slippage is reduced after addition of a polymeric additive having a glass transition temperature below 100 ℃ to an elastomer, such as spandex. Without being bound by any theory, it is believed that this reduction in spandex slippage occurs due to polymer migration to the elastomeric surface during spinning and storage periods. It is believed that the additive increases the adhesion and friction between the elastomer and any sheath short fibers, thus preventing elastic fiber slippage during, for example, garment manufacture, garment wet processing, and home laundering.

Accordingly, one aspect of the present invention is directed to a slip-resistant elastomeric fiber comprising an elastomer and an effective amount of a polymeric additive having a glass transition temperature of less than 100 ℃.

The amount of polymer additive having a glass transition temperature below 100 ℃ that is effective to produce anti-slip fibers according to the present invention can vary over a fairly wide range. When a polymer additive at a concentration as low as half weight percent of the fiber is used in the fiber in combination with a conventional finishing agent (finisher), an improvement in the slip resistance of the elastomeric fiber is obtained. However, when the polymer additive is at least 1%, a greater improvement is obtained. Although larger concentrations of polymer additive (e.g., 10%) may sometimes be used, smaller concentrations of 5% are generally used and preferred concentrations are in the range of 1 to 3%.

In one non-limiting embodiment, the polymeric additive incorporated for anti-slip properties comprises the reaction product between an aliphatic diisocyanate and a polyol or an aliphatic diol (diol).

To maximize the efficacy of the additive by enhanced phase separation from the polymer, difunctional aliphatic isocyanates are preferred, including the family of bis (4-isocyanato-cyclohexyl) methane and 1, 6-diisocyanatohexane. However, other examples of difunctional isocyanates that may be used in the present invention include 4,4' -methylenebis (phenyl diisocyanate) (also known as 4, 4-diphenylmethane diisocyanate (MDI)), 2,4' -methylenebis (phenyl diisocyanate, 4' -methylenebis (cyclohexyl diisocyanate), 1, 4-xylylene diisocyanate, 1, 4-bis (isocyanatomethyl) cyclohexane, 2, 6-toluene diisocyanate, 2, 4-toluene diisocyanate, and mixtures thereof examples of specific diisocyanates include

500 and

1,4-H6XDI (Mitsui Chemicals),

MB (Bayer corporation),

M (BASF) and

125MDR (Dow Chemical) and combinations thereof.

Amino diols and other amino functional polyols are preferred polyol sources for imparting dye sites and improved environmental durability. Such amino diols may include, but are not limited to, N-t-butyldiethanolamine, N-methyldiethanolamine, N-ethyldiethanolamine, and mixtures thereof. Other polyols may be used, including but not limited to poly (tetramethylene ether) glycol (PTMEG), copolyether glycols (such as poly (tetramethylene ether-co-ethyleneether) glycol, and poly (tetramethylene ether)Ether-co-2-methyltetramethyleneether) glycol), low molecular weight polyester and copolyester glycols having not more than 12 carbon atoms per molecule (such as polycaprolactone glycols and those produced by the condensation polymerization of aliphatic dicarboxylic acids and diols, or mixtures thereof), and polycarbonate glycols produced by the condensation polymerization of aliphatic glycols with phosgene, dialkyl carbonates, or diaryl carbonates. Examples of specific commercially available diols are

Glycols (indovida of Wichita, kansas, USA)), PTG-L glycols (guoka Chemical co., ltd., rodoya), tokyo (Tokyo, japan)

Diols (Ube Industries, ltd., tokyo, japan) and

polyols (Stepan, illinois, USA).

One non-limiting example of an effective polymeric additive is a polyurethane or derivative thereof comprising bis (4-isocyanatocyclohexyl) methane and N-alkyldiethanolamine. See, e.g., FIG. 4A, where R represents-CH ₃ 、-CH ₂ CH ₃ 、-CH ₂ CH ₂ CH ₃ 、-CH ₂ CH ₂ CH ₂ CH ₃ 、-C(CH ₃ ) ₃ Or other alkyl groups having 18 carbons or less. This type of additive has an adhesive function. It is a polymeric basic amine having tertiary amine repeating units along the polymer chain, which is useful as an acid dye assistant. It also provides some benefits in whiteness maintenance when used at very high concentrations. It can provide substantial benefits in acid dyeability plus improvements in performance after smoke gas and NOx emissions.

Another non-limiting example of an effective polymeric additive is a copolymer having long alkyl or alkenyl, straight or branched side chains. See, e.g., fig. 4B, where R1 represents an NH or O group; r2 represents an alkyl or alkenyl, linear or branched C4-C22 group; and M represents a monomer copolymerizable with maleic anhydride, including but not limited to styrene, substituted styrene, ethylene, vinyl acetate, propylene, butadiene, octadecene, acrylamide, acrylonitrile, acrylates, methacrylates, vinyl chloride. Such polymer additives are prepared by reacting an amine or alcohol with a copolymer comprising maleic anhydride. This chemical makes the elastomer to which it is added more viscous and thicker. The additive comprises-COOH, long alkyl or alkenyl groups, linear or branched side chains and exhibits a softening temperature below 75 ℃, which can result in interaction with cotton and increased friction with short fibers.

Although the inventors herein use spandex as the elastomer, as will be apparent to the skilled artisan, other elastomeric polymers having rubber-like elasticity may be used generally in the fibers, as well as in the included yarns, fabrics, and articles and are included within the scope of the present invention.

When using spandex, fibers are made from segmented polyurethane polymers such as those based on polyethers, polyesters, polyetheresters, and the like. Such polymers and the preparation of fibers from such polymers are well known processes and are described, for example, in U.S. Pat. nos. 2,929,804, 3,097,192, 3,428,711, 3,553,290, and 3,555,115, the entire contents of which are incorporated herein by reference. With respect to the present invention, although any segmented polyurethane polymer may be used, it has been found that spandex fibers made from polyether-based polyurethanes benefit more from the inclusion of additives according to the present invention than other fibers. For this reason, the embodiment of the present invention comprising a polyether-based polyurethane is preferred.

In making the anti-slip spandex fiber according to the invention, a solution of long alkyl or alkenyl, linear or branched side chain synthetic polymer comprising at least 85% segmented polyurethane is prepared and then dry spun into filaments through a die. An effective amount of the polymer additive having a glass transition temperature of less than 100 ℃ and any other desired additives is typically dissolved or dispersed in a solvent and then added to the polymer solution at any of several points in the solution processing system upstream of the orifice.

In addition to the above-mentioned polymeric additives having a glass transition temperature of less than 100 ℃, the anti-slip elastomeric fibers of the present invention may also contain one or more additional additives having different uses, including but not limited to matting agents, additional antioxidants, dyes, dye enhancers, UV stabilizers, pigments, and other functional enhancing materials.

In one non-limiting embodiment of the invention, the anti-slip elastomeric fiber is used in an elastic composite yarn comprising the anti-slip elastomeric fiber covered by a sheath hard fiber. Non-limiting examples of such composite yarns are depicted in fig. 3 (a) through 3 (E). The anti-slip spandex is surrounded, twisted, or entangled by at least one hard fiber or yarn. Composite yarns comprising anti-slip elastomeric fibers and hard yarns are also referred to as "covered yarns" in the context of this specification. The hard sheath covers the elastomeric fiber of spandex for synthetic gloss, glare, and bright appearance. Hard yarn wrapping also serves to protect the elastomer from abrasion during the weaving process, which can lead to elastomeric fiber breakage and subsequent process interruptions and undesirable fabric non-uniformities. Furthermore, the coating helps to stabilize the elastic behavior of the fiber, so the composite yarn elongation can be controlled more uniformly during the weaving process than would be possible with bare elastomeric fibers.

In one non-limiting embodiment, the composite yarn is a core spun yarn produced by introducing the anti-slip elastomer fiber of the present invention to the front draw roll of the spinning frame where it is covered with staple fiber. One non-limiting embodiment of a representative core-spun apparatus 40 is shown in fig. 5.

In the core-covering process, the anti-slip fiber of the present invention is combined with a hard yarn to form a composite core-covering yarn. As shown in fig. 5, the anti-slip fiber from tube 48 is unwound in the direction of arrow 50 by the action of positively driven feed roller 46. The feed rollers 46 act as carriers for the tube 48 and deliver the anti-slip fibers 52 at a predetermined speed.

The hard fibers or yarns 44 are unwound from the tube 54 to meet the anti-slip fibers 52 at the front set of rollers 42. The combined anti-slip fibers 52 and hard fibers 44 are cored together at the spinning device 56.

The anti-slip fiber 52 is drawn (drafted) before it enters the front roller 42. The anti-slip fiber is drawn by the speed difference between the feed roller 46 and the front roller 42. The feed speed of the front roller 42 is greater than the speed of the feed roller 46. Adjusting the speed of the feed rollers 46 can achieve a desired draw ratio or draw ratio.

Such draw ratios are typically 1.01 to 5.0 times (1.01 to 5.0X) as compared to undrawn fiber. Too low a draw ratio will result in a low quality yarn with outer penetration and non-centered anti-slip fibers. Too high a draw ratio will result in breakage of the anti-slip fibers and core voids.

In one non-limiting embodiment, the core spun yarn of the present invention comprises anti-slip fibers having a linear density in the range of about 10 denier to about 180 denier, such as about 20 denier to about 140 denier. The linear density of the hard yarn may range from about 5 cotton counts (Ne) to about 60 cotton counts, for example 6 to about 40 cotton counts.

The anti-slip fiber of the present invention can also be used in a core spun yarn having two core filaments (core filament I and core filament II). In the core spun yarn, core filament I is an anti-slip elastomer fiber, preferably anti-slip spandex, and core II is a control filament. The two core filaments are sheathed on the surface by a rigid staple fiber. In one non-limiting embodiment, the control filament of core filament II is textured polyester, nylon (nylon), rayon filament, PPT filament, bicomponent fiber, or PBT drawn fiber. The inventors herein have surprisingly found that the addition of a control filament as core filament II helps to hold the anti-slip fibers of core filament I in place and prevent their pull back. Fabrics prepared from such double core yarns have high tensile forces and high recovery forces. In one non-limiting embodiment, the linear density of control filament core II is in the range of about 15 denier (16.5 dtex) to about 450 denier (495 dtex), including about 30 denier to 150 denier (33 dtex to 165 dtex). The use of the higher linear denier control filaments can result in a fabric having substantial outer penetration.

In one non-limiting embodiment of the invention, the composite yarn is a synthetic filament/spandex air covered yarn as shown in fig. 3 (B). The terms "entangling", "interlacing" and "covering" (also referred to as "entangling", "interlacing", "interlaced" or "covered") as used herein refer to processes and products in which air jets are directed at the yarn, typically at a 90 ° angle to the yarn path. For this example, as depicted in fig. 3 (B), during production, the speed or tension on the yarn was substantially the same at the entrance and exit of the interlacing and the resulting product had a high degree of interlacing or entanglement of the filaments with the anti-slip spandex. During processing, anti-slip fibers are fed to the interlacing jet along with the coated rigid filaments. The components are bonded together by interlacing the rigid filaments. This method is characterized by high processing speeds. Untwisting is not required.

In one non-limiting embodiment of the invention, the wrap yarn is a single wrap yarn, also known as single wrap, in which the anti-slip fiber is wrapped with a rigid hard filament fiber, as depicted in fig. 3 (C). In this non-limiting embodiment, the anti-slip fibers are precisely extended through a hollow spindle, covered with a rigid covering yarn, and wound on a cross-winding bobbin. The anti-slip fibers are wrapped in only one direction (S-turn) or Z-turn). These single covered yarns have a tendency to twist, which can complicate further processing. However, the twisting effect can be reduced by reducing the ductility heat treatment flow. Furthermore, this twisting effect can be reversed by shrinking during the finishing process by nearly 100%.

In one non-limiting embodiment of the invention, the wrap yarn is a double wrap yarn, also known as double wrap, in which the anti-slip fiber is wrapped with two rigid hard filament fibers, as shown in fig. 3 (D). In this non-limiting example, the anti-slip spandex yarns are precisely extended through a hollow spindle, covered with two rigid covering yarns, and wound on a cross-winding bobbin. The double covered yarns are crossed, that is to say covered in the S and Z directions. The inner wrap regulates the draw and the outer wrap compensates for the twist tendency of the yarn. The additional covering of the composite yarn against sliding fibres makes these yarns extremely suitable for articles which must be extremely durable.

In one non-limiting embodiment of the invention, the composite yarn is a twisted covered yarn. In this embodiment, the spun yarn is first twisted or plied together from staple fibers. Then, anti-slip fibers were added and twisted together. Non-limiting examples of these types of yarns include two-in-one twisted yarns and Hamel (Hamel) twisted yarns. In a two-in-one twisted yarn, anti-slip fibers are assembled with a rigid spun yarn on a high speed assembly winder. Subsequent twisting is performed on a two-in-one twisting frame. In this non-limiting embodiment, the anti-slip fibers are well-wrapped into a twist. The finished product made from this yarn has very high service performance and good slip resistance. The elastic two-in-one composite yarn can also be produced using bare anti-slip fibers. The wrapping operation is replaced by an assembly and drawing operation. This is done on an assembly winding machine equipped with feeder rollers to adjust the anti-slip fiber draft. During this operation, the anti-slip fibers are stretched and simultaneously assembled with the rigid fiber component. The twisting of the yarn is carried out on a two-in-one frame.

In one non-limiting embodiment of the invention, the covered yarn is a hollow spindle twisted composite yarn (hamel yarn) in which the anti-slip fiber is covered by a spun yarn or filament. The anti-slip fibers were guided through a hollow spindle as shown in fig. 3 (E). The hard yarn is wound on a pre-twisted flanged bobbin (HD bobbin) and then placed in a tubular spindle. During the twist process, the HD bobbin rotates with a spindle, which is fitted with a cover that hermetically seals the bobbin interior to avoid dust deposition. The anti-slip spandex is still untwisted and completely covered with hard fiber yarn. In one non-limiting embodiment of the invention, the wrap yarn is Siro-

And (3) compounding the yarns. In this non-limiting embodiment, two separate rovings are fed to the drafting system of the spinning frame. Guiding anti-slip fibersBetween two rovings. These component yarns are combined after the last cylinder of the drawing field and are scrambled by a twist. In the Siro-spun technique, a yarn having twist characteristics can be produced in one step. Thus, the technique results in double covered yarns consisting of individual twisted threads. The anti-slip fibers are combined with the two rovings via the second feed roller, whereby the anti-slip fibers have a specified draft. After the spinning process, the Siro-spun can optionally be steamed and wound on a tube by means of an automatic cone. The Siro-spun yarn has a more preferred covering and a good hand compared to the core spun yarn.

Stretch woven fabrics comprising the anti-slip fibers of the present invention can be prepared by the following process. Anti-slip fibers are combined with hard fibers, such as filaments or staple roving, that is to say cotton, wool, flax, polyester, nylon and rayon or combinations of these, to produce an anti-slip fiber composite yarn. During the formation of the composite yarn having the anti-slip fiber core, the anti-slip fiber is drawn from about 1.01x to about 5.0x of its original length. The composite yarn is then woven with at least one staple or filament yarn to form a fabric, which is then dyed and finished by a weave dyeing (piece dyeing) or continuous dyeing process. The slip resistant fiber composite yarns may be used in the warp or weft direction to produce warp or weft stretch fabrics. The available fabric stretch (elongation) in the direction of the core spun yarn may be at least about 10% and no greater than about 110%. This range of available fabric stretch provides sufficient comfort to the wearer while avoiding poor fabric appearance and excessive fabric growth. The anti-slip fiber composite yarns may also be used in both the warp and fill directions of the fabric to obtain a biaxially stretched fabric, i.e., a fabric having stretch in both the warp and fill directions. In such a case, the available fabric stretch may be at least about 10% and no greater than about 110% in each direction.

When the anti-slip elastic composite yarn is used in one direction, such as in the weft direction, there is no particular limitation on the fibers in the other direction of the fabric, provided that the benefits of the present invention are not compromised. Spun fibers of cotton, polycaprolactam, poly (hexamethylene adipamide), poly (ethylene terephthalate), poly (trimethylene terephthalate), poly (tetramethylene terephthalate), wool, linen and blends thereof may be used, and filaments of polycaprolactam, poly (hexamethylene adipamide), poly (ethylene terephthalate), poly (trimethylene terephthalate), poly (tetramethylene terephthalate), spandex and blends thereof may also be used. Similarly, when the anti-slip composite yarn is used in the warp direction, there is no particular limitation on the weft fibers of the fabric, provided that the benefits of the present invention are not compromised. Many types of spun staple fibers and filaments, such as warp yarns, can be used in the weft direction.

Fabrics and garments of some embodiments may use a variety of different fibers and yarns. These include cotton, wool, acrylic, polyamide (nylon), polyester, spandex, regenerated cellulose, rubber (natural or synthetic), bamboo, silk, soy, or combinations thereof.

In one non-limiting embodiment of the invention, if the slip-resistant fiber composite yarn is used in one direction, such as in the weft direction, the filaments of the yarn having stretch-and-recovery properties (e.g., spandex, polyester bicomponent fiber, etc.) can be used in another direction, such as in the warp direction. In this case, the fabric may have warp stretch as well as weft stretch properties.

The woven fabric of the present invention may be a plain weave, twill, wale (weft rib), or satin weave. Examples of twill fabrics include 2/1, 3/1, 2/2, 1/3, herringbone (herringbone) and pointed twill (pointed twill). Examples of weft-striped fabrics include 2/3 and 2/2 weft stripes. The fabric of the present invention is suitable for use in various clothes requiring stretch, such as pants, jeans, shirts, and sportswear.

Types of looms that can be used to make the woven fabrics of the present invention include air jet looms, shuttle looms, water jet looms, rapier looms, and small steel shuttle rapier (projectile) looms.

The cloth dyeing or continuous dyeing process may be used to dye and finish the fabrics of the present invention. Denim (Denim) fabrics are an important field of application for the anti-slip fiber and composite yarn of the present invention.

The fabric of the invention has excellent cotton hand feeling. The fabric has soft and smooth hand feeling and is comfortable to wear. No anti-slip fiber exposure on the fabric surface occurs; the anti-slip fibers are not visible or felt. The fabric feels more natural and has better drape than conventional elastic woven fabrics, is generally too stretchable and has a synthetic, hot hand.

Analytical method

The following analytical methods were used.

Fabric loading and unloading force

The elongation and toughness properties were measured on the fabric using a dynamic tensile tester Instron. The sample size measured along the length dimension was 1x3 inches (1.5cm x 7.6 cm). The sample was placed in a jig and extended at a strain rate of 200% elongation per minute until maximum elongation was reached. The denim samples were extended at 0% to 30% elongation for three cycles. After the third cycle, the loading and unloading forces at 12% or 30% elongation were measured.

Elastic fiber seam slippage

Fabric samples were tested under standardized conditions of temperature, time and mechanical action to re-establish the elastic fiber slippage that occurs in industrial laundry and home laundering. Subsequently, elastic fiber slippage was measured according to the standard procedure shown. Two representative 50x50cm fabric samples were prepared that were cut parallel to the length and width of the fabric. Each sample should contain a different set of warp and weft yarns. The specimen should be marked to indicate the direction of the pass.

Each sample was over-lock stitched using the following conditions to prevent unraveling of the original edges during washing: sewing needle: 100-110SUK systems; sewing thread: the needles and the yarn tubes are all piled in 30 Nm/3; suture density: 3 to 4 stitches/cm.

The fabric samples were washed and dried under the following conditions: a washing machine: similar to Tupesa TSP-15, a 1-vertical machine with a single 75cm diameter compartment; bath temperature: at 98 deg.C; processing time: 90 minutes; bath ratio: 1/8; machine speed: 25 to 28rp; PH:10; salt: 20gr/1; drying temperature: at 90 deg.c.

After the finish wash and tumble drying, the samples were conditioned for at least 16 hours by laying down each sample into a monolayer. The samples were lightly steam ironed to aid in the measurements.

Elastic fiber seam slippage was measured as follows: two spots are selected and marked along both sides of the sample in the warp and/or weft direction. In each marked spot, the fabric was cut to 5cm in the width and/or length direction of the fabric and excess lockstitch was carefully removed. Under fabric inspection light, weft and/or warp yarns are removed one by one from the 5.0cm area and the warp/weft elastic fibers are observed. It is sometimes necessary to untwist the wrap yarn to find the elastic fibers. Once the elastic fiber is found, the removal of the weft/warp yarn is stopped. The distance between the edge of the fabric and the position of the elastic threads is measured. The average of this distance in the two samples is considered as elastic fiber slippage in millimeters.

Examples of the invention

The following examples demonstrate the invention and its ability to be used in the manufacture of various fabrics. The invention is capable of other and different embodiments and its several details are capable of modifications in various obvious aspects, all without departing from the scope and spirit of the present invention. Accordingly, the examples should be considered as illustrative and not restrictive in nature.

Example 1: preparation of additives from polyurethanes containing bis (4-isocyanatocyclohexyl) methane and N-alkyldiethanolamines

The polyurethane additive is prepared by reacting bis (4-isocyanatocyclohexyl) methane with N-alkyldiethanolamine. See fig. 4A. For example, N-t-butyldiethanolamine (1600.0 g) and bis (4-isocyanatocyclohexyl) methane (2290.0 g,

w, from cowestro (Covestro)) was added to 3287.0g of Dimethylacetamide (DMAC). The solution was heated to 70 ℃ to 120 ℃, maintained for 4 to 12 hours, and then cooled to room temperature. Determination of the molecular weight Mn =5300 and the degree of dispersion by Gel Permeation Chromatography (GPC) using a refractive index detector

DMAc and 0.1% LiCl were used as an eluent for GPC at 60 ℃ and a flow rate of 1.0 mL/min. Use ofPolystyrene (PS) standards calibrate GPC.

An example of MDEA-105: bis (4-isocyanatocyclohexyl) methane (152.0 g) was added to 300.0g of DMAC in the reactor. N-methyldiethanolamine (80.0 g) and 100.0g DMAC were slowly added to the kettle.

The solution was heated to 85 ℃ for 6 hours, then cooled to room temperature. The polymer was analyzed by GPC, having a molecular weight Mn =3500 and a dispersity

An example of BDEA-105: bis (4-isocyanatocyclohexyl) methane (158.4 g) was added to 360.0g of DMAC in the reaction kettle. N-butyldiethanolamine (113.3 g) and 120.0g DMAC were slowly added to the kettle. The solution was heated to 85 ℃ for 6 hours, then cooled to room temperature. The polymer was analyzed by GPC, having a molecular weight Mn =3400 and a degree of dispersion

Example 2: preparation of additives from polyurethanes containing bis (4-isocyanatocyclohexyl) methane and N-methyldiethanolamine

The polyurethane additive is prepared by reacting bis (4-isocyanatocyclohexyl) methane with N-methyldiethanolamine. Bis (4-isocyanatocyclohexyl) methane (152.0 g) was added to 300.0g DMAC in the kettle. N-methyldiethanolamine (80.0 g) and 100.0g DMAC were slowly added to the kettle. The solution was heated to 85 ℃ for 6 hours, then cooled to room temperature. The polymer was analyzed by GPC, having a molecular weight Mn =3500 and a dispersity

Example 3: preparation of additives from polyurethanes comprising bis (4-isocyanatocyclohexyl) methane and diols

The polyurethane additive is prepared by reacting bis (4-isocyanatocyclohexyl) methane with 2-methyl-1, 3-propanediol.

Of MPD-105An example is as follows: bis (4-isocyanatocyclohexyl) methane (150.8 g), 2-methyl-1, 3-propanediol (60.0 g), K-KAT XK640 (0.04 g, king Industries, inc.) and DMAC (370.0 g) were added to the reaction kettle. After heating the solution to 90 ℃ for 6 hours, it was cooled to room temperature. The polymer was analyzed by GPC, having a molecular weight Mn =4100 and a degree of dispersion

An example of MPenD-105: bis (4-isocyanatocyclohexyl) methane (150.8 g), 3-methyl-1, 5-pentanediol (79.5 g), K-KAT XK640 (0.04 g, king corporation, ltd.), and DMAC (400.0 g) were added to the reaction vessel. The solution was heated to 90 ℃ for 6 hours, then cooled to room temperature. The polymer was analyzed by GPC, having a molecular weight Mn =4500 and a degree of dispersion

An example of PD-105: bis (4-isocyanatocyclohexyl) methane (150.8 g), 1, 5-pentanediol (70.8 g), K-KAT XK640 (0.04 g, king Kogyo Co., ltd.), and DMAC (385.0 g) were added to the reactor. The solution was heated to 90 ℃ for 6 hours, then cooled to room temperature. The polymer was analyzed by GPC, having a molecular weight Mn =4500 and a degree of dispersion

Example 4: preparation of Long-side-chain copolymers

Long side chain copolymers are prepared by reacting an alkyl or alkenyl, linear or branched amine or alcohol with the anhydride groups in a poly (M-co-maleic anhydride) copolymer. See fig. 4B. In a typical experiment, poly (M-co-maleic anhydride) is dissolved in a Dimethylacetamide (DMAC) solution followed by the addition of an alcohol or amine. The mixture is heated to 50 to 120 ℃ for 1 to 10 hours. 1854cm according to FT-IR ^-1 And 1772cm ^-1 The disappearance of the peak (oscillation of the anhydride group) and the reaction is complete conversion.

Poly (styrene-co-maleic acid)Maleic anhydride) to

From Perlacco (Polyscope). Stearylamine is available as Armeen 18D from Nouron. 41.70g of poly (styrene-co-maleic anhydride) ((Co-maleic anhydride))

1000 474mg/KOH acid number) was added to 250.0g of Dimethylacetamide (DMAC). After the solids dissolved, 44.10g of stearyl amine (Armeen 18D) was added to the solution and heated to 85 ℃ for 4 hours. The long side chain copolymer PS-C18 solution was formed by cooling to room temperature. The polymer was recovered by removing the DMAC solvent under vacuum. The glass transition temperature (Tg) of the PS-C18 polymer was 55.85 ℃ as determined by Differential Scanning Calorimetry (DSC) (FIG. 6).

By making

2000 (acid value of 370 mg/KOH) was reacted with Armeen 18D to prepare a 2PS-C18 polymer similarly. The Tg of 2PS-C18 was 41.37 ℃ as determined by DSC (FIG. 7).

Example 5: fiber spinning process

For all examples, 100.00 parts

1800 and 23.46 parts

125MDR to produce an isocyanate terminated prepolymer. The concentration of isocyanate end groups in the prepolymer formed was 2.60% by weight of the prepolymer. The prepolymer was mixed with N, N-dimethylacetamide (DMAc) and dissolved therein to give a solution with about 45 wt% solids, and then further reacted with a DMAc solution comprising a mixture of Ethylenediamine (EDA) and 2-methylpentamethylenediamine (DEA) in a 90 to 10 molar ratio and Diethylamine (DEA) to form a viscous poly (urethane urea) solution with 35% polymer solids.

Will be provided withThe polymer solution is slurried with an additive to produce about 1.35% by total weight of solids

GP45 antioxidant, 0.54% of a spinning aid based on silicone oil, 1.50% of huntite/hydromagnesite and 0.17% of titanium oxide powder. The resulting polymer solution containing the blended additives was spun into 44dtex 5 filament spandex fiber using a dry spinning process at a wind speed of 869 meters/minute. For different examples, various concentrations of polyurethane-based anti-slip additives were blended into the polymer in slurry form. All examples were spun under similar conditions in terms of decitex (44 dtex) and spinning speed.

Example 6: elastic composite yarn and fabric manufacture

For each of the following examples of denim fabric, 100% cotton open end spun yarn or ring spun yarn (ring spin) was used as warp yarn. The denim fabric comprises two yarns: 7.0Ne OE yarns and 8.5Ne OE yarns with irregular patterns. Prior to warping, the yarn is indigo dyed in rope form. Then, it was sized and wound onto a beam (weaving beam).

Several composite yarns with elastic and low-melt fibers were used as the weft yarns, including core-spun, air-jet-spun, and double-core-spun. Table 1 lists the materials and processes used to make the composite yarns for each example.

Spandex is available from Lycra (LYCRA) of Wilmington, delaware.

The composite yarns of each example were then used to make a stretch woven fabric. Table 1 summarizes the yarn used in the fabric and the seam slip length of the fabric. Unless otherwise indicated, the fabric is woven on a Donier (Donier) air jet or rapier loom. The loom speed was 500 shuttles/minute. The fabric is 3/1 twill. The width of the fabric in the loom and greige condition was about 76 and about 72 inches, respectively. The loom has twice the beam capacity.

Each greige fabric in the examples was completed by a jiggle dye machine. Each woven fabric was weighed at 49 ℃ to 3.0 wt%

64 (Sybron Inc.) Pre-wash for 10 minutes. Thereafter, it was mixed at 71 ℃ with 6.0% by weight

(Dooley Chemicals LLC Inc.) and 2.0% by weight

LFH (DuPont Co., ltd.)) desized for 30 minutes and then washed with 3.0% by weight at 82 ℃%

64. 0.5% by weight

LFH and 0.5 wt.% trisodium phosphate were washed for 30 minutes.

Example a:44dtex anti-sliding spandex fiber and core-spun yarn

Example a includes a set of spandex fibers and cotton core yarns and fabrics. Spandex fibers are made with various finishes (finishes), ingredients, and with or without anti-slip polymer additives. Bis (4-isocyanatocyclohexyl) methane and N-alkyldiethanolamine are used as anti-slip polymer additives. 14s cotton core yarns with these spandex fibers were made at a draft of 3.5X. The 1/3 twill denim fabric was woven at 40 picks per inch and finished. The spandex slip length was then tested.

Sample 1 is a comparative example because no anti-slip polymer additive was added. The fabric had an extremely high seam slip of 28.7mm. Such fabrics have a high risk of creating defective clothes associated with slip after laundering. The fabric loading force at 30% elongation was 1616.6 grams and the removal force (recovery force) at 12% elongation was 156.2 grams.

In

sample

2, 2% of the anti-slip polymer additive was added during the fiber spinning process. The test data showed a significant reduction in fabric slippage to 9.4% (see Table 1). Such fabrics have a very low risk of slip-related defects after the laundry washing process.

In sample 3, 3% of the anti-slip polymer additive was added to the fiber. The fabric slip length is also at an extremely low level (9.5 mm).

In sample 4, the high inclusion content inorganic chloride resist was added while maintaining the anti-slip polymer additive at 3%. The fabric still maintains the sliding length at a low level (11.1%).

Sample 5 demonstrates that even after the addition of the release additive, the spandex with the anti-slip polymer additive still performs well in anti-slip. The fabric anti-slip length was 11.7mm. The fabric loading force at 30% elongation was 1880 grams and the removal force (recovery force) at 12% elongation was 191.5 grams. Such fabric of sample 5 continued to provide comfort and freedom of movement while maintaining excellent recovery compared to sample 1.

Sample 6, which was 44dtex slip resistant spandex with 3 filaments, also had very low slip levels after addition of the slip resistant polymer additive. The sliding length was 12.2mm, which is similar to 44dtex spandex with 5 filament fibers (sample 5). The fabric loading force at 30% elongation was 1686.2 grams and the removal force (recovery force) at 12% elongation was 145.2 grams.

Sample 7 used an anti-slip additive based on bis (4-isocyanatohexyl) methane and N-methyldiethanolamine and was spun to 44dtex anti-slip spandex with 5 filaments. The fiber slip length was 9.4mm, which is similar to 44dtex spandex with 5 filament fibers (sample 5). The fabric loading force at 30% elongation was 2377.2 grams and the removal force (recovery force) at 12% elongation was 259.1 grams.

Sample 8 used an anti-slip additive based on bis (4-isocyanatohexyl) methane and 3-methyl-1, 5-pentanediol and was spun to 44dtex anti-slip spandex with 5 filaments. The fiber slip length was 14.9mm, which also resulted in improved performance relative to the control (sample 1). The fabric loading force at 30% elongation was 2398.0 grams and the removal force (recovery force) at 12% elongation was 250.0 grams.

Example B:78dtex anti-sliding spandex fiber and core-spun yarn

Example B included two types of anti-slip 77dtex spandex fiber and cotton core yarns and fabrics. The spandex fiber had 5 filaments.

The spandex in sample 7 is a comparative example of spandex without an anti-slip additive. Fabrics made from this fiber had extremely high seam slippage of 20.2mm as shown in table 1. The fabric loading force at 30% elongation was 1639.5 grams and the removal force (recovery force) at 12% elongation was 232.1 grams.

In sample 8, 2% of a slip-resistant polymer additive of bis (4-isocyanatocyclohexyl) methane with N-alkyldiethanolamine was added to spandex during fiber manufacture. The fabric seam slip length was reduced to 13.5mm, indicating that the fabric has a low risk of developing defective garments associated with spandex slip after garment washing. The fabric loading force at 30% elongation was 1599.7 grams and the take off force (recovery force) at 12% elongation was 284.9 grams. Thus, the addition of the anti-slip additive did not affect the fabric loading and unloading forces associated with fabric comfort and shape retention compared to sample 7.

Example C: anti-slip spandex fiber with long side chain additives

Example C includes three spandex fibers and a cotton core yarn and fabric. Spandex fibers are made with or without an anti-slip polymer additive. Long side chain polymers are used as anti-slip polymer additives. 14s cotton core yarns with these spandex fibers were made at a draft of 3.5X. The 1/3 twill denim fabric was woven at 40 threads/inch and finished.

Sample 9 is a comparative example of 50dtex spandex without added anti-slip polymer additive. The fabric had a high seam slip of 20.4 mm. Such fabrics have a high risk of producing defective garments associated with slip after laundering.

In sample 10, the 2% slip resistant polymer additive PS-C18 was added during the fiber spinning process. The fabric slippage was reduced to 17.1mm (see table 1).

In sample 11, 2% of another type of anti-slip polymer additive 2PS-C18 was added to the fiber. In this sample, the fabric slip length was reduced to even 15.4mm.

Example D: two-step covered composite yarn

Example D includes four pieces of core-spun composite yarn and fabric comprising a bifilaments as the core and a sheath covered with cotton staple fiber. The composite yarn is made from three types of yarns: a first type 1 of sheath fiber, a second type 2 of spandex fiber, and a third type 3 of anchor filament, wherein the elastic fiber and anchor fiber are adhered together in a discontinuous cohesive bond. The yarn is made by a two step process.

In a first step, the spandex fibers and the anchor filaments are interwoven together by an air-jet coating process. After the air-coating process, the spandex fibers and the anchoring filaments form a pre-bonded composite core. Then, in a second step, the yarn surface of the prebonded composite core is covered with cotton in a core-covering machine. The sheath fiber cotton covers the surface of the yarn to provide a real appearance and a soft touch. The pre-bonded composite core may provide bonding forces to help prevent spandex slippage during laundry manufacture, laundry wet processes, and home laundering.

Sample 12 is a comparative example in which the spandex fiber is 44/5dtex without the anti-slip polymer additive. The anchoring filaments were 75d/144f polyester textured filaments. The two filaments are pre-bonded together at the air-jet coating machine. This prebonded filament is then wrapped in a core spun yarn with cotton to form a 14S cotton core spun yarn. Finally, the core was woven into a denim fabric having 40 picks per inch. The slip of this fabric was 14.3mm.

Sample 13 has the same yarn and fabric construction as sample 12. The only difference was that the spandex contained 2% of a slip-resistant polymer additive of bis (4-isocyanatocyclohexyl) methane with an N-alkyldiethanolamine. As shown in table 1, the fabric slip was 4.5mm.

Sample 14 is also a comparative example having the same spandex fiber, yarn structure, and fabric structure as sample 12. The only difference is anchoring the filaments: 75D/34f polyester bicomponent

Fibers of

Manufactured by a company. The fabric slip was 4.9mm.

Sample 15 had the same sample yarn and fabric construction as sample 14. The only difference was that the spandex contained 2% of a slip-resistant polymer additive of bis (4-isocyanatocyclohexyl) methane with N-alkyldiethanolamine. As shown in table 1, the fabric slip was 2.8mm.

Example E: double-core composite yarn

Example E includes four pieces of core-spun composite yarn and fabric comprising a bifilaments as the core and a sheath covered with cotton staple fiber. The composite yarn is made from three types of yarns: the first type of sheath fiber 1, the second type of spandex fiber 2, and the third type of anchor filament 3, where the elastic fiber and anchor fiber were fed directly into the core spun yarn machine without any pre-bonding processing as was done in example D.

Sample 16 is a comparative example with 44/5dtex spandex fiber without any anti-slip polymer additive. The anchoring filaments were 75d/144f polyester textured filaments. The two filaments were fed directly into the core spun yarn machine and covered with cotton to form 14S cotton core spun yarn. This yarn was then woven into a denim fabric having 40 picks per inch. The slip of this fabric was 20.8mm.

Sample 17 had the same sample yarn and fabric construction as sample 16. The only difference was that the spandex contained 2% of the slip-resistant polymer additive bis (4-isocyanatocyclohexyl) methane with N-alkyldiethanolamine. As shown in table 1, the fabric slip was 8.5mm.

Sample 18 is a comparative example having the same spandex fiber, yarn structure, and fabric structure as sample 16. The only difference is anchoring the filaments: 75D/34f polyester bicomponent

Fibers of

Manufactured by a company. The fabric slip was 8.0mm.

Sample 19 had the same sample yarn and fabric construction as sample 18. The only difference was that the spandex contained 2% of a slip-resistant polymer additive of bis (4-isocyanatocyclohexyl) methane with N-alkyldiethanolamine. As shown in table 1, the fabric slip was 5.9mm.

Example F: air-jet covered composite yarn

Example F includes two pieces of air-covered composite yarn and fabric. The 225D polyester textured filaments were interwoven with 44dtex spandex.

Sample 20 is a comparative example with no anti-slip additive added. The fabric slip length was 15.4mm.

In sample 21, the added spandex contained the anti-slip polymer additive bis (4-isocyanatocyclohexyl) methane with N-alkyldiethanolamine. The fabric slip was 10.0mm.

TABLE 1

Claims

1. An elastomeric fiber having reduced spandex (elastane) slippage, said fiber comprising an elastomer and at least one anti-slippage polymeric additive having a glass transition temperature of less than 100 ℃.

2. The elastomeric fiber of claim 1, wherein the elastomer is spandex (spandex).

3. The elastomeric fiber of claim 2 wherein the spandex is a polyether-based spandex polymer.

4. The elastomeric fiber of claim 1, wherein the anti-slip polymer additive is added at a concentration of about 1% to about 4% by weight of the fiber.

5. The elastomeric fiber of claim 1, wherein the anti-slip polymer additive is added at a concentration of about 0.5% to about 10% by weight of the fiber.

6. The elastomeric fiber of claim 1, having a fiber denier of 10d to 400 d.

7. The elastomeric fiber of claim 1 having a fiber denier of 15d to 180 d.

8. The elastomeric fiber of claim 1, wherein the anti-slip polymer additive is a polyurethane or derivative thereof comprising bis (4-isocyanatocyclohexyl) methane and N-alkyldiethanolamine.

9. The elastomeric fiber of claim 1, wherein the anti-slip polymer additive is a long side chain polymer.

10. The elastomeric fiber of claim 1, further comprising one or more additional additives.

11. The elastomeric fiber of claim 10, wherein said one or more additional additives are selected from matting agents, additional antioxidants, dyes, dye enhancers, UV stabilizers, pigments, or combinations thereof.

12. An elastic composite yarn comprising the anti-slip elastomer fiber of any one of claims 1-11.

13. The elastic composite yarn of claim 12 comprising a core comprising the anti-slip elastomeric fiber.

14. The elastic composite yarn of claim 13, said core being surrounded, twisted, or intertwined with hard fibers.

15. The elastic composite yarn of claim 14, wherein the hard fiber is selected from staple fiber, cotton, wool, acrylic, polyamide or nylon, polyester, regenerated cellulose, bamboo, silk, soy, or combinations thereof.

16. The elastic composite yarn of claim 13, wherein the core further comprises a control filament.

17. The elastic composite yarn according to claim 16, wherein the control filament is selected from textured polyester, nylon, rayon filament, PPT filament, polyester bicomponent filament, or PBT fiber, or combinations thereof.

18. The elastic composite yarn of claim 13, wherein the composite yarn is a core spun yarn comprising the slip resistant elastomeric fiber in the core.

19. The elastic composite yarn of claim 13, wherein the composite yarn is an air-covered yarn comprising a slip resistant elastomeric fiber in the core.

20. A woven stretch fabric comprising the elastic composite yarn of any one of claims 12-19.

21. An article comprising the elastomeric fiber of any one of claims 1-11 or the elastic composite yarn of any one of claims 12-19 or the fabric of claim 20.

22. The article of claim 19 which is a garment.