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ELASTIC FILM LAMINATES
This application claims benefit of provisional application Ser. No. 60/058,894 filed Sep. 15, 1997.
FIELD OF THE INVENTION
The present invention relates to film laminates. More particularly, the present invention relates to elastic laminates of films and nonwoven fabrics.
BACKGROUND OF THE INVENTION
Film laminates have become an important article of commerce, finding a wide variety of applications including use as outer covers for personal care articles such as diapers, 15 training pants, incontinence garments, feminine hygiene products and the like. In addition, film laminates have found use in outdoor fabrics, tarpaulins, protective apparel, infection control products, garments and the like. The films can provide the desired barrier properties to the article while 20 other materials laminated thereto can provide additional characteristics such as strength, abrasion resistance and/or good hand.
Many articles incorporating film laminates are desirably at least partially elastic. For example, an outer cover of a 25 diaper that is elastic will have improved body conformance relative to inelastic articles. However, achieving the desired elasticity while maintaining other desired characteristics such as breathability, good aesthetics and low cost is problematic. Low cost film laminates, such as those used in 30 disposable articles, often suffer from poor peel strengths. Delamination of the film laminate is undesirable as it gives the appearance of an article of lesser quality and can often increase the risk of creating a rip or tear in the film.
Thus, there exists a need for a film laminate which exhibits elasticity yet which retains desired characteristics such as breathability, good hand and excellent peel strength. In addition, there exists a need for such a laminate having well defined bond patterns, loft and overall improved aesthetics. Moreover, there exists a need for such a barrier laminate which has a cloth-like outer surface, is durable and further which may employ a variety of film and laminate structures. Further, there exists a need for such a film laminate that may be fabricated by a robust process which is ^ functional under a wide latitude of processing conditions and parameters.
SUMMARY OF THE INVENTION
The aforesaid needs are fulfilled and the problems expe- 50 rienced by those skilled in the art overcome by an elastic laminate of the present invention comprising an extensible base film, an elastic intermediate nonwoven web and an extensible outer fibrous material bonded thereto. The first side of the elastomeric intermediate web is bonded to the 55 base film and the second side is bonded to the outer fibrous material. In a further aspect, the elastomeric intermediate web comprises an amorphous polymer. As an example the amorphous polymer can comprise a low density ethylene elastomer component which comprises a copolymer of eth- 60 ylene and an alpha-olefin. In a further aspect, the low density polyethylene elastomer desirably has a density between about 0.86 g/cm3 and about 0.89 g/cm3. In addition, the amorphous polymer can comprise a blend having a second polyolefin polymer, such as a second ethylene polymer 65 having a higher density. Desirably the low density polyethylene elastomer comprises at least about 50 weight % of the
fiber. The elastic intermediate web desirably comprises a nonwoven web such as a web of melfblown fibers.
The extensible base film can comprise an elastic film and desirably comprises a breathable film. In one aspect of the present invention, the film may comprise an elastic breathable barrier such as, for example, a stretched filled-film comprising an elastomeric polyethylene polymer and a filler. The base film, elastic intermediate web and outer fibrous material preferably have a collective basis weight less than about 100 g/m2. The outer fibrous material layer can comprise a thermoplastic nonwoven fabric. Desirably the outer nonwoven layer comprises a cloth-like fabric, having excellent hand and drape. In one aspect of the invention, the outer nonwoven layer comprises a necked or reversibly necked nonwoven web. The laminate of the present invention desirably has a peel strength in excess of 200 g/cm2 and even more desirably in excess of 500 g/cm2. Further, the breathable barrier laminate can have a WVTR in excess of 300 g/m2/day, 800 g/m2/day and even 1500 g/m2/day. The outer fibrous material can comprise a nonwoven web and, in a further aspect can be laminated to the bonding layer by laminating the respective layers together. Suitable methods for laminating the layers includes, but is not limited to, thermal point bonding, ultrasonic bonding and the like.
As used herein the term "nonwoven" fabric or web means a web having a structure of individual fibers or threads which are interlaid, but not in an identifiable manner as in a meshed or knitted fabric. Nonwoven fabrics or webs have been formed by many processes such as, for example, meltblowing processes, spunbonding processes, hydroentangling, air-laid and bonded carded web processes.
As used herein "microfiber web" means a web comprising fibers having an average fiber diameter less than about 10fi in at least one dimension.
As used herein the term "spunbond fibers" refers to small diameter fibers of substantially molecularly oriented polymeric material. Spunbond fibers may be formed by extruding molten thermoplastic material as filaments from a plurality of fine, usually circular capillaries of a spinneret with the diameter of the extruded filaments then being rapidly reduced as by, for example, in U.S. Pat. No. 4,340,563 to Appel et al, and U.S. Pat. No. 3,692,618 to Dorschner et al, U.S. Pat. No. 3,802,817 to Matsuki et al, U.S. Pat. Nos. 3,338,992 and 3,341,394 to Kinney, U.S. Pat. No. 3,502,763 to Hartman, U.S. Pat. No. 3,542,615 to Dobo et al, and U.S. Pat. No. 5,382,400 to Pike et al. Spunbond fibers are generally not tacky when they are deposited onto a collecting surface and are generally continuous. Spunbond fibers are often about 10 microns or greater in diameter. However, microfiber spunbond may be achieved by various methods including, but not limited to, those described in commonly assigned U.S. patent application Ser. Nos. 08/756,426 filed Nov. 26, 1996 to Marmon et al. and application Ser. No. 08/565,261 filed Nov. 30,1995 to Pike et al., the contents of which are incorporated herein by reference.
As used herein the term "meltblown fibers" means fibers of polymeric material which are generally formed by extruding a molten thermoplastic material through a plurality of fine, usually circular, die capillaries as molten threads or filaments into converging high velocity, usually hot, gas (e.g. air) streams which attenuate the filaments of molten thermoplastic material to reduce their diameter. Thereafter, the meltblown fibers can be carried by the high velocity gas stream and are deposited on a collecting surface to form a
web of randomly dispersed meltblown fibers. Such a process is disclosed, for example, in U.S. Pat. No. 3,849,241 to Butin et al. and U.S. Pat. No. 5,271,883 to Timmons et al. Meltblown fibers may be continuous or discontinuous and are generally tacky when deposited onto a collecting surface. 5 Meltblown fibers can include microfiber webs.
As used herein "SMS laminate" means a spunbond/ melfblown/spunbond (SMS) laminate. Examples of multilayer nonwoven laminates are disclosed in U.S. Pat. No. 4,041,203 to Brock et al, U.S. Pat. No. 5,178,931 to Perkins 1° et al. and U.S. Pat. No. 5,188,885 to Timmons et al. Such a laminate may be made by sequentially depositing onto a moving forming belt first a spunbond fabric layer, then a meltblown fabric layer and last another spunbond layer and then bonding the laminate such as by thermal point bonding :5 as described below. Alternatively, the fabric layers may be made individually, collected in rolls, and combined in a separate bonding step.
As used herein the term "polymer" generally includes but is not limited to, homopolymers, copolymers, such as for 20 example, block, graft, random and alternating copolymers, terpolymers, etc. and blends and modifications thereof. Furthermore, unless otherwise specifically limited, the term "polymer" includes all possible spacial configurations of the molecule. These configurations include, but are not limited 25 to isotactic, syndiotactic and random symmetries.
As used herein the term "amorphous polymer", when used herein to describe a bonding layer either as an intermediate layer or a separately applied layer, means a ther- 3Q moplastic polymer such as certain polyolefins with a density in the range of from about 0.85 to about 0.89 g/cm3 and low crystallinity, for example, less than about 30.
As used herein, the term "machine direction" or MD means the length of a fabric in the direction in which it is 35 produced. The term "cross machine direction" or CD means the width of fabric, i.e. a direction generally perpendicular to the MD.
As used herein, "ultrasonic bonding" means a process performed, for example, by passing the fabric between a 40 sonic horn and anvil roll as illustrated in U.S. Pat. No. 4,374,888 to Bornslaeger or in U.S. Pat. No. 5,591,278 to Goodman et al.
As used herein "point bonding" means bonding one or more fabrics at a plurality of discrete points. For example, 45 thermal point bonding generally involves passing one or more layers to be bonded between heated rolls such as, for example an engraved pattern roll and a smooth calender roll. The engraved roll is, patterned in some way so that the entire fabric is not bonded over its entire surface, and the anvil roll 50 is usually flat. As a result, various patterns for engraved rolls have been developed for functional as well as aesthetic reasons. One example of a pattern has points and is the Hansen Pennings or "H&P" pattern with about a 30% bond area when new and with about 200 bonds/square inch as 55 taught in U.S. Pat. No. 3,855,046 to Hansen and Pennings. The H&P pattern has square point or pin bonding areas wherein each pin has a side dimension of 0.038 inches (0.965 mm), a spacing of 0.070 inches (1.778 mm) between pins, and a depth of bonding of 0.023 inches (0.584 mm). 60 The resulting pattern has a bonded area of about 29.5% when new. Another typical point bonding pattern is the expanded Hansen Pennings or "EHP" bond pattern which produces a 15% bond area when new with a square pin having a side dimension of 0.037 inches (0.94 mm), a pin 65 spacing of 0.097 inches (2.464 mm) and a depth of 0.039 inches (0.991 mm). Another typical point bonding pattern
designated "714" has square pin bonding areas wherein each pin has a side dimension of 0.023 inches, a spacing of 0.062 inches (1.575 mm) between pins, and a depth of bonding of 0.033 inches (0.838 mm). The resulting pattern has a bonded area of about 15% when new. Yet another common pattern is the C-Star pattern which has, when new, a bond area of about 16.9%. The C-Star pattern has a cross-directional bar or "corduroy" design interrupted by shooting stars. Other common patterns include a diamond pattern with repeating and slightly offset diamonds with about a 16% bond area and a wire weave pattern looking as the name suggests, e.g. like a window screen, with about a 15% bond area. A further pattern is the "s-weave" pattern having about a 17% bond area when new. Typically, the percent bonding area varies from around 10% to around 30% of the area of the fabric laminate web.
As used herein, the term "barrier" means a film, laminate or other fabric which is substantially impermeable to the transmission of liquids and which has a hydrohead of at least 50 mbar water. Hydrohead as used herein refers to a measure of the liquid barrier properties of a fabric. However, it should be noted that barrier fabrics of the present invention can have a hydrohead value greater than 80 mbar, 150 mbar or even 300 mbar water.
As used herein, the term "breathable" refers to a material which is permeable to water vapor having a minimum WVTR of about 300 g/m2/24 hours. The WVTR of a fabric is water vapor transmission rate which, in one aspect, gives an indication of how comfortable a fabric would be to wear. WVTR (water vapor transmission rate) is measured as indicated below and the results are reported in grams/square meter/day. However, often applications of breathable barriers desirably have higher WVTRs and breathable laminates of the present invention can have WVTRs exceeding about 800 g/m2/day, 1500 g/m2/day, or even exceeding 3000 g/m2/day.
As used herein the term "extensible" means elongatable or stretchable in at least one direction.
As used herein "elastic" means a material which, upon application of a biasing force, is stretchable, that is extensible, to a stretched, biased length which is at least 150% of its relaxed unbiased length, and which will retract at least 50 percent of its elongation upon release of the elongating force. A hypothetical example would be a one (1) inch sample of a material which is elongatable to at least 1.50 inches and which, upon release of the biasing force, will retract to a length of not more than 1.25 inches.
As used herein, the term "inelastic" or "nonelastic" refers to any material which does not fall within the definition of "elastic" above.
As used herein the term "monocomponent" fiber refers to a fiber formed from one or more extruders using only one polymer. This is not meant to exclude fibers formed from one polymer to which small amounts of additives have been added for coloration, antistatic properties, lubrication, hydrophilicity, etc.
As used herein the term "multicomponent fibers" refers to fibers which have been formed from at least two polymers extruded from separate extruders but spun together to form one fiber. Multicomponent fibers are also sometimes referred to as conjugate or bicomponent fibers. The polymers of a multicomponent fiber are arranged in substantially constantly positioned distinct zones across the cross-section of the fiber and extend continuously along the length of the fiber. The configuration of such a fiber may be, for example, a sheath/core arrangement wherein one polymer is surrounded by another or may be a side by side arrangement, a pie arrangement or an "islands-in-the-sea" type arrangement. Multicomponent fibers are taught in U.S. Pat. No. 5,108,820 to Kaneko et al, U.S. Pat. No. 4,795,668 to Krueger et al. and U.S. Pat. No. 5,336,552 to Strack et al. 5 Conjugate fibers are also taught in U.S. Pat. No. 5,382,400 to Pike et al. and may be used to produce crimp in the fibers by using the differential crystallization rates of the two (or more) polymers. For bicomponent fibers, the polymers may be present in ratios of 75/25, 50/50, 25/75 or any other 10 desired ratios. The fibers may also have shapes such as those described in U.S. Pat. No. 5,277,976 to Hogle et al, U.S. Pat. Nos. 5,466,410 to Hills and 5,069,970 and 5,057,368 to Largman et al., which describe fibers with unconventional shapes. 15
As used herein the term "blend" means a mixture of two or more polymers while the term "alloy" means a sub-class of blends wherein the components are immiscible but have been compatibilized.
As used herein the term "biconstituent fibers" or "multi- 20 constituent" refers to fibers which have been formed from at least two polymers extruded from the same extruder as a blend. The term "blend" is defined above. Biconstituent fibers do not have the various polymer components arranged in relatively constantly positioned distinct zones across the 25 cross-sectional area of the fiber and the various polymers are usually not continuous along the entire length of the fiber; instead they usually form fibrils or protofibrils which start and end at random. Bicomponent and biconstituent fibers are also discussed in the textbook Polymer Blends and Com- 30 posites by John A. Manson and Leslie H. Sperling, copyright 1976 by Plenum Press, a division of Plenum Publishing Corporation of New York, IBSN 0-306-30831-2, at pages 273 through 277.
As used herein, the term "bonding window" means the range of temperature of the mechanism, e.g. a pair of heated bonding rolls, used to bond the nonwoven fabric together, over which such bonding is successful.
As used herein, the term "scrim" means a lightweight 4Q fabric used as a backing material. Scrims are often used as the base fabric for coated or laminated products.
As used herein, the term "garment" means any type of apparel which may be worn. This includes industrial work wear and coveralls, undergarments, pants, shirts, jackets, 45 gloves, socks, and the like.
As used herein, the term "infection control product" means medically oriented items such as surgical gowns and drapes, face masks, head coverings like bouffant caps, surgical caps and hoods, footwear like shoe coverings, boot 50 covers and slippers, wound dressings, bandages, sterilization wraps, wipers, garments like lab coats, coveralls, aprons and jackets, patient bedding, stretcher and bassinet sheets, and the like.
As used herein, the term "personal care product" means 55 diapers, training pants, absorbent underpants, adult incontinence products, and feminine hygiene products.
As used herein, the term "protective cover" means a cover for vehicles such as cars, trucks, boats, airplanes, motorcycles, bicycles, golf carts, etc., covers for equipment 60 often left outdoors like grills, yard and garden equipment (mowers, roto-tillers, etc.) and lawn furniture, as well as floor coverings, table cloths and picnic area covers.
BRIEF DESCRIPTION OF THE DRAWINGS
FIG. 1 is a cross-sectional view of a laminate of the present invention.
FIG. 2 is a cross-sectional view of a laminate of the present invention.
FIG. 3 is a schematic diagram of a process line for making a laminate of the present invention.
FIG. 4 is a view of a bonding pattern suitable for use with the present invention.
FIG. 5 is a view of a bonding pattern suitable for use with the present invention.
DETAILED DESCRIPTION OF THE
In reference to FIG. 1, the present invention is directed to a multilayer laminate 10 comprising a film 12, an outer fibrous layer 20 and an intermediate elastic nonwoven web. The intermediate nonwoven web 14 has a first side 16 and a second side 18. The outer fibrous layer 20 is attached to the second side 18 of intermediate elastic fiber nonwoven web 14 and the film 12 is attached to the first side 16 of the intermediate elastic nonwoven web 14.
The intermediate elastic nonwoven web comprises a layer of amorphous polymer fibers. The polymer composition desirably comprises an elastomer and may further include a tackifier or other bonding aid to improve adhesion between the intermediate nonwoven web and the opposed film and outer nonwoven layer(s). Examples of suitable polymers include, but are not limited to, elastomeric polyolefins, ethylene-vinyl acetate (EVA), EPDM rubbers, ethyleneethyl acrylate (EEA), ethylene acrylic acid (EAA), ethylene methyl acrylate (EMA), polyurethane (PU), polyamide polyether block copolymers, block copolymers having the general formula A-B-A' or A-B like copoly(styrene/ ethylene-butylene), styrene-poly(ethylene-propylene)styrene, styrenepoly(ethylene-butylene)-styrene, and the like.
In a preferred embodiment, the amorphous polymer comprises one or more elastic polyolefins such as a low density polyethylene elastomer, elastic polypropylene, flexible polyolefins, and tackified polymers such as styrenic block copolymers, polyurethanes or block polyamide polyethers. In one aspect of the present invention the intermediate elastic nonwoven web comprises, at least in part, a low density elastomeric polyolefin polymer component such as, for example, a low density ethylene elastomer component having a density less than 0.89 g/cm3. Desirably the ethylene elastomer comprises a substantially linear ethylene which has a density less than 0.89 g/cm3, desirably from about 0.86 g/cm3 to about 0.88 g/cm3 and even more desirably about 0.87 g/cm3. The ethylene elastomer preferably comprises at least about 50% by weight of the polymeric portion of the fibers, and more desirable from about 70% to about 100% by weight. Preferably the ethylene elastomer comprises a polymer wherein the ethylene monomers are polymerized with an alpha-olefin such that the resulting polymer composition has a narrow molecular weight distribution (M^/IVL,), homogeneous branching and controlled long chain branching. Suitable alpha-olefins include, but are not limited to, 1-octene, 1-butene, 1-hexene and 4-mefhyl-pentene. Exemplary polymers include those which are known in the art as "metallocene", "constrained geometry" or "single-site" catalyzed polymers such as those described in U.S. Pat. No. 5,472,775 to Obijeski et al; U.S. Pat. No. 5,451,450 to Erderly et al; U.S. Pat. No. 5,539,124 to Etherton et al; and U.S. Pat. No. 5,554,775 to Krishnamurti et al; the entire contents of which are incorporated herein by reference.
The metallocene process generally uses a metallocene catalyst which is activated, i.e. ionized, by a co-catalyst.
Examples of metallocene catalysts include bis(nbutylcyclopentadienyl)titanium dichloride, bis(nbutylcyclopentadienyl)zirconium dichloride, bis (cyclopentadienyl)scandium chloride, bis(indenyl) zirconium dichloride, bis(methylcyclopentadienyl)titanium 5 dichloride, bis(me thy Icy elope ntadienyl)zirconium dichloride, cobaltocene, cyclopentadienyltitanium trichloride, ferrocene, hafnocene dichloride, isopropyl (cyclopentadienyl,-l-fiourenyl)zirconium dichloride, molybdocene dichloride, nickelocene, niobocene dichloride, 10 ruthenocene, titanocene dichloride, zirconocene chloride hydride, zirconocene dichloride, among others. A more exhaustive list of such compounds is included in U.S. Pat. No. 5,374,696 to Rosen et al. and assigned to the Dow Chemical Company. Such compounds are also discussed in 15 U.S. Pat. No. 5,064,802 to Stevens et al. and also assigned to Dow. However, numerous other metallocene catalysts, single site catalysts, constrained geometry catalysts and/or comparable catalyst systems are known in the art; see for example, The Encyclopedia of Chemical Technology, Kirk- 20 Othemer, Fourth Edition, vol. 17, Olefinic Polymers, pp. 765-767 (John Wiley & Sons 1996); the contents of which are incorporated herein by reference.
Regarding elastomeric polymers, U.S. Pat. No. 5,204,429 to Kaminsky et al. describes a process which may produce 25 elastic copolymers from cycloolefins and linear olefins using a catalyst which is a stereorigid chiral metallocene transition metal compound and an aluminoxane. U.S. Pat. Nos. 5,278, 272 and 5,272,236, both to Lai et al., assigned to Dow Chemical and entitled "Elastic Substantially Linear Olefin 30 Polymers" describe polymers having particular elastic properties, the entire contents of which are incorporated herein by reference. Suitable low density ethylene elastomers are commercially available from Dow Chemical Company of Midland, Mich, under the trade name 35 AFFINITY, including AFFINITY EG8200 (5 MI), XU 58200.02 (30 MI), XU 58300.00 (10 MI) and from Exxon Chemical Co. of Houston, Tex. under the trade name EXACT 4049 (4.5 MI, 0.873 g/cm3); 4011 (2.2 MI, 0.888 g/cm3); 4041 (3 MI, 0.878 g/cm3); 4006 (10 MI, 0.88 40 g/cm3).
In addition, it is believed that the intermediate elastomeric fibrous layer may comprise a polymer blend of the amorphous polymer with one or more other polymers which comprise up to about 75% by weight of the fiber and more 45 desirably up to about 50% of the fiber. It is believed that the fibers may comprise a low density polyethylene elastomer and additional thermoplastic polymers, desirably higher density and/or more crystalline polyolefins. Polyolefins that may be suitable for use with the present invention include, 50 but are not limited to, LLDPE (density between about 0.90 g/cm3-0.92 g/cm3), LDPE (0.915-0.925 g/cm3, ethylenepropylene copolymers, ethylene vinyl acetate, ethylene ethyl acrylate, ethylene acrylic acid, ethylene methyl acrylate and the like. 55
Examples of additional commercially available elastic polymers include, but are not limited to, Himont CATALLOY KS350, KS357 and KS359. Himont Catalloy polymer is an olefinic multistep reactor product wherein an amorphous ethylene propylene random copolymer is molecularly 60 dispersed in a predominantly semicrystalline high propylene monomer/low ethylene monomer continuous matrix, such as described in U.S. Pat. No. 5,300,365 to Ogale. In addition, useful elastomeric resins include block copolymers having the general formula A-B-A or A-B, where A and A are each 65 a thermoplastic polymer endblock which contains a styrenic moiety such as a poly (vinyl arene) and where B is an
elastomeric polymer midblock such as a conjugated diene or a lower alkene polymer. Block copolymers of the A-B-A type can have different or the same thermoplastic block polymers for the A and A blocks, and the present block copolymers are intended to embrace linear, branched and radial block copolymers. In this regard, the radial block copolymers may be designated (A-B)m-X, wherein X is a polyfunctional atom or molecule and in which each (A-B)mradiates from X in a way that A is an endblock. In the radial block copolymer, X may be an organic or inorganic polyfunctional atom or molecule and m is an integer having the same value as the functional group originally present in X. It is usually at least 3, and is frequently 4 or 5, but not limited thereto. Thus, in the present invention, the expression "block copolymer", and particularly "A-B-A" and "A-B" block copolymer, is intended to embrace all block copolymers having such rubbery blocks and thermoplastic blocks as discussed above, which can be extruded (e.g., by meltblowing), and without limitation as to the number of blocks. The elastomeric nonwoven web may be formed from, for example, elastomeric (polystyrene/poly (ethylenebutylene)/polystyrene) block copolymers. Commercial examples of such elastomeric copolymers are, for example, those known as KRATON materials which are available from Shell Chemical Company of Houston, Tex. KRATON block copolymers are available in several different formulations, a number of which are identified in U.S. Pat. Nos. 4,663,220 and 5,304,599, the entire contents of which are hereby incorporated by reference.
Polymers composed of an elastomeric A-B-A-B tetrablock copolymer may also be used in the practice of this invention. Such polymers are discussed in U.S. Pat. No. 5,332,613 to Taylor et al. In such polymers, A is a thermoplastic polymer block and B is an isoprene monomer unit hydrogenated to substantially a poly(ethylene-propylene) monomer unit. An example of such a tetrablock copolymer is a styrene-poly(ethylenepropylene)-styrene-poly(ethylenepropylene) or SEPSEP elastomeric block copolymer available from the Shell Chemical Company of Houston, Tex. under the trade designation KRATON.
Other exemplary elastomeric materials which are believed suitable for use with the present invention include polyurethane elastomeric materials such as, for example, those available under the trademark ESTANE from B. F. Goodrich & Co. or MORTHANE from Morton Thiokol Corp., polyester elastomeric materials such as, for example, those available under the trade designation HYTREL from E. I. DuPont De Nemours & Company, and those known as ARNITEL formerly available from Akzo Plastics of Arnhem, Holland and now available from DSM of Sittard, Holland.
In order to improve the thermal compatibility of the intermediate nonwoven web with those of the adjoining layers, it may be desirable to add a tackifier or bonding aid to the elastic polymer composition. Examples of suitable tackifiers include, but are not limited to those described in U.S. Pat. No. 4,789,699 to Kieffer et al. Examples of commercially available tackifiers are REGALREZ 1126 available from Hercules Inc. of Wilmington, Del.; ESCOREZ 5300 from Exxon Chemical Co. and WINGTACK 95 from Goodyear Chemical Co. of Akron, Ohio. The amount of tackifier added will vary with respect to the particular elastic polymer employed in the intermediate elastic fiber layer and those polymers comprising adjoining layers. Although the amount of tackifier added to the elastic intermediate layer will vary, often addition of about 5 to about 20% by weight of the polymer composition is desirable.