KR100499766B1 - Pressure-sensitive adhesive coated linerless non-woven loop tape material assembly - Google Patents

Abstract

The adhesive layer of the upper nonwoven loop tape fastener material in the assembly is arranged to be in direct contact with the lower loop layer of the nonwoven loop tape fastener material and is used in a hook and loop fastener system comprising one or more multilayers of loop tape fastener material sheets. A storage / dispensing assembly, such as a roll or pile of nonwoven loop tape fastener material, such as one. When the upper loop tape fastener material is separated from the assembly, at least a portion of the nonwoven loop layer is made of fifteen denier or more fibers to reduce the degree of fiber detachment.

Description

PRESSURE-SENSITIVE ADHESIVE COATED LINERLESS NON-WOVEN LOOP TAPE MATERIAL ASSEMBLY}

The present invention relates to a nonwoven fibrous material that can be applied to detachably bond a loop fastener material as a pair of male mechanical fastening elements arranged on a loop fastener material coated on one side with a pressure sensitive adhesive and covered with a similar adhesive without intervening detachment elements. It relates to a loop fastener material.

U.S. Patent 5,605,729 describes a storage / distribution assembly of a loop fastener system comprising a loop fastener material used in a hook and one or more multilayer sheets of loop tape fastener material having a pressure sensitive adhesive layer on one side of the loop tape fastener material. Doing. The loop tape fastener material is stored in dispensable conditions on the bottom loop tape fastener material to be in direct contact with the roof layer of the bottom loop tape fastener material. When the upper loop tape fastener material is separated from the lower loop tape fastener material, the loops of the lower loop tape fastener material are in a joinable state. Loop tape fastener materials generally include a loop layer consisting of a number of flexible loops; A lower base layer to which the loop is fixed; And a pressure sensitive adhesive layer on the opposite surface of the base layer. A wide variety of loop materials have been described as suitable, including knit, woven, stitch bonded material or nonwovens. Examples include woven polyester knit loop fiber extrudates rolls coated with polypropylene and subsequently coated with a pressure sensitive adhesive of a sticky styrene butadiene block copolymer. In addition, as an example, a spun bond in which a film is thermally bonded to a cast film of ethylene propylene compression copolymer resin, an adhesive coated on the opposite side of a tacky “KRATON” 1111 adhesive (adhesive based on styrene isoprene styrene block copolymer). (spun bond) polypropylene loop fibers are exemplified. This loop tape structure is in terms of its productivity; It has been found to have great advantages in terms of roll stability, ease of use and performance. However, in nonwoven fibrous loop tape materials, when the upper loop tape fastener material is separated, the fibers of the lower loop tape material tend to separate from the backing material or the base layer. This fiber release can reduce the pressure-sensitive adhesive layer adhesion level of the upper loop tape and / or reduce the loop to hook adhesion with the lower loop tape material when subsequently attached to the substrate. In general, it is desirable to minimize this level of fiber separation.

Nonwoven loop fastener materials are generally known in the art and are of great interest because of their inexpensiveness, ease of manufacture, and aesthetics. For example, U. S. Patent No. 5,256, 231 corrugates either a nonwoven web or a series of substantially non-parallel yarns in a corrugated nip, and subsequently on a particular fastening site of a corrugated sheet of fibrous material. A method of making nonwoven loops or fibrous loop materials by extrusion bonding plastic films is described. Generally, the size of each fiber in the loop material is less than 25 denier, preferably 1 denier to 10 denier, and has a substrate weight of 5 g to 300 g per square meter of loop material. This provides an inexpensive and very effective nonwoven loop structure. U.S. Patent 5,032,122 and PCT Application WO 95/33390 form a loop fastener material having a nonwoven fibrous material intermittently bonded to the backing layer by causing the nonwoven material to corrugate or protrude from the backing layer between the fastened regions. It describes how to do it. In both cases, the nonwoven loop material is secured to the backing layer while in a dimensionally unstable state and, in the case of elastomeric back material, causes shrinkage of the back material under stable conditions such as the application of heat or relaxation of tension. Let's do it. In general, the nonwoven fibrous material that forms the loop may, in the case of the US patent, be a filament or nonwoven described in particular examples of spunbond polypropylene fibers of 8 denier to 9 denier. The PCT specification generally describes filaments as spun fibers or blown fibers, preferably polypropylene fibers of 2 denier to 15 denier.

U.S. Pat.Nos. 5,326,612 and 5,407,439 and PCT application WO 96/04812 generally have a base weight of about 5 g to 40 g per square yard and are described as preferably made from 0.5 to 15 denier filaments. A method of making a loop fastener material from a nonwoven material such as this is described.

British patent application 2285093 describes a loop material which is formed by bonding a fibrous loop material to a compression recoverable backing layer and is generally formed of a woven material but may also be a foam. The backing layer is mechanically bonded to the nonwoven fabric or to the stitch bonding loop material by needle punching, stitch bonding or adhesive. The fibrous loop material can be made from fibers of various diameters, from spun bonded fibers of 10 to 15 microns in diameter to staple fibers of 10 to 100 microns in diameter. This roof material is unstable in dimensions and inadequate for most industrial uses.

PCT application WO 95/12702 is similar to that described in British Patent No. 2285093, but uses a filament with a diameter of 25-100 microns to form a plurality of entangled loop springs, each with a diameter of 0.5 mm to 3 mm. The method of laminating | stacking is described.

Japanese Patent Publication No. 7-313213 describes a loop fastener material formed by fusing one side of a nonwoven loop fabric formed of a sheath-core composite fiber having a polyethylene sheath and a polypropylene core. Generally the fibers are described as having a diameter of 0.5 to 10 denier and a basis weight of the nonwoven web of 20 to 200 g per square meter.

The loop fastener material of the present invention is an improvement over that described in US Pat. No. 5,605,729 with respect to the loop tape fastener material formed from the nonwoven loop fastener layer. In particular, the present invention provides an improved loop strength and solves the problems associated with reducing fiber contamination of the adhesive layer when separating the adhesive layer on the upper loop tape fastener material from the lower loop tape fastener material.

Brief Description of the Invention

In accordance with the present invention there is provided a loop tape fastener material assembly comprising at least one multi-layered sheet of loop tape fastener material usable as a loop portion of a hook and loop fastener, wherein the nonwoven loop tape fastener material is (1) (a) Forming a first major surface comprising a plurality of flexible fiber loops adapted to be detachably coupled by an auxiliary hook portion of a hook and loop fastener, and (b) a base layer and / or a backing layer to which the nonwoven loop is fixed. Nonwoven loop layer; And (2) a pressure-sensitive adhesive layer that forms the second major surface in that order.

The nonwoven roof layer is made of at least some fibrous fibers or filaments of at least 15 denier. The nonwoven loop tape fastener material is arranged in the assembly such that the adhesive layer of the upper nonwoven loop tape fastener material is in direct contact with the roof layer of the lower nonwoven loop tape fastener material. The lower loop is of such a structure, so that when the upper nonwoven loop tape fastener material is separated from the assembly, the lower loop is preferably in a joinable state. In general, when the nonwoven loop tape fastener material is rolled, the lower loop is compressed by the upper loop tape fastener material arranged in the roll, and the compressed lower loop is regenerated after detaching the upper nonwoven loop tape.

Brief description of the drawings

The invention will be described in detail with reference to the drawings, wherein

1 is a partial cross-sectional view of one embodiment of the storage / dispensing assembly of the present invention,

2 is a side view of another embodiment of the storage / dispensing assembly of the present invention having a portion of loop fastener material dispensed,

3 is a cross-sectional view of the dispensed loop fastener material of FIG.

These drawings are made in a fictitious manner and are not intended to be actual, and are provided only to illustrate the present invention and are not intended to limit the present invention thereto.

The nonwoven loop fastener material assembly of the present invention is shown in FIG. The illustrated assembly 10 includes a stack of three multilayer sheets 12a, 12b, 12c of nonwoven loop tape fastener material used as loop portions of hook and loop fasteners. However, the assembly of the present invention comprises a width of the nonwoven loop tape fastener material; And a number of layers, depending on the form of the dummy or seamless roll. The loop tape fastener material 12 has (1) a nonwoven loop layer 14 forming a first major surface and the nonwoven loop layer 14 is (a) detachable to the hook and auxiliary hook portions (not shown) of the loop fastener. A nonwoven loop layer 14 comprising a plurality of fibers 15 yarns used to bond and (b) a base layer and / or backing layer 16 to which the loops are fixed, forming a first major surface; And (2) a pressure-sensitive adhesive layer 18 that sequentially forms the second major surface of the loop fastener material 12. The nonwoven loop tape fastener material is arranged in the assembly 10 in such a manner that the adhesive layer 18a of the upper nonwoven loop tape fastener material is in direct contact with the roof layer 14b of the lower nonwoven loop tape fastener material. The loop of the loop layer 14b is thus formed such that when the upper nonwoven loop tape fastener material 12a is separated from the assembly 10, the lower nonwoven loop tape fastener material remains unseparated. In some embodiments, removal of the upper nonwoven loop tape is sufficient for the loop to be accessible by the auxiliary hook material. In another embodiment, when the loop is compressed in the assembly, in order to obtain a bondable state, the loop 14b must be recovered from its compressed situation only with its own properties or with the aid of the adhesive layer 18a.

The nonwoven loop tape fastener materials used in the assembly of the present invention are a variety of nonwoven loop materials, such as spun bonded nonwovens, melt blown nonwovens, fluff webs, airlaid nonwovens, needle punch nonwovens, spunlace nonwovens. Fabrics, suitable combinations thereof, and the like.

In many applications, the nonwoven loop tape material used in the assembly of the present invention has a substrate weight of about 3 to 20 ounces / square yard (102 to 678 g / m ² ), polyolefin (eg polypropylene), polyester, It is made of filaments made of nylon or a combination of such materials. Examples describing nonwoven loop materials suitable for use in the present invention are disclosed in US Pat. No. 5,032,122 (Noel et al.), PCT WO 920401 (Gorman et al.) And European patent 341993 B1 (Gorman et al.).

According to the present invention, when a given proportion of nonwoven loop material is formed from filaments or fibers having an average of at least 15 deniers, when the upper nonwoven loop tape material is separated from the assembly without additional binder or binder yarn, significantly less fiber yarn It was found that it is separated from. This results in less contamination of the upper loop tape adhesive and correspondingly having better adhesion to the substrate to which the loop tape fastener material is subsequently attached. In general, the loop material has a residue comprising less than 15 denier, preferably 3 to 9 denier fibers, 25% by weight of 15 to 50 denier fiber yarns, preferably 15 to 30 denier fiber yarns (Preferably 50 to 100% by weight).

As will be explained below, it may be desirable to control the adhesion between the loop of the upper loop layer 14 and the adhesive layer 18 to achieve the required release characteristics of the upper loop tape in the assembly. Control of the adhesive and release properties of the loop tape in the assembly can be accomplished by various techniques. First, the adhesive 18 can be selected according to the inherent adhesive properties of the selected roof layer 14. Second, the roof layer 14 may be selected in consideration of the unique interaction with the selected adhesive. The material of the roof layer 14 may have inherently required release properties, for example, prior to arranging the nonwoven loop tape fastener material in the assembly, as an additive in the polymer composition or through a graft polymerization reaction, a release control agent. The release properties of the roof layer may be modified by incorporating a release control agent into the nonwoven loop making material and / or by applying a release control agent on the nonwoven loop surface. Examples of incorporating release control agents include graft polymerization reactions, such as polymer melt additives or fluorochemical graft polymers disclosed in PCT application WO 92/15626 (Rolando et al.) And the like. Surface coating (eg, topical) release agents include urethanes as disclosed in US Pat. No. 2,532,011 (Dahlquist et al.); Reactive silicones; Fluorochemical polymers; Epoxysilicon as disclosed in U.S. Pat.

As described above, in some embodiments, when the nonwoven loop tape fastener material is arranged in the form of the storage / dispensing assembly of the present invention, the loop is hardly pressurized by the top adhesive layer. In many cases, however, it is necessary to use a nonwoven loop tape fastener material made of a very soft and / or light material. Such nonwoven loops tend to be very flexible and thus can be compressed when arranged in the present storage / distribution assembly. When this material is arranged in a storage / dispensing assembly, the nonwoven loop is pressurized by the upper nonwoven loop tape fastener material. After separation, the nonwoven loop must be repaired so that it can be easily combined. In some embodiments, after detaching the upper loop tape portion 12a, the nonwoven loop 14b is almost recovered without adhesive. In other words, the compression is decompressed so that they can almost regain the top before assembly. However, it is generally desirable to utilize the action of the top loop tape adhesive layer 18a for further recovery of the bottom loop 14b. In such instances, the top adhesive layer is sufficiently firmly bonded to the nonwoven loops so that when the top nonwoven loop tape fastener material is separated from the assembly, the adhesive tends to pull the bottom nonwoven loops to regenerate these loops in a bondable state.

The adhesion of the adhesive layer to the lower nonwoven loop is preferably low enough so that when the adhesive layer is separated from them, the nonwoven loop is pulled away from the nonwoven loop layer and not separated. This effect can be sufficiently achieved by using fibers or filaments having 15 deniers or more in the nonwoven roof layer in the concentration ranges described above. If most of the loop fibers are pulled apart and not fixed to the base layer, the detached loop fibers may tend to contaminate the top adhesive layer and degrade its adhesive properties. This can also reduce the normal number of loops of the lower loop tape material that can be used for joining by the auxiliary hook material, thereby reducing the mechanical coupling force achieved with the formed hook and loop fastener system.

2 illustrates another embodiment of the present invention, wherein the storage / distribution assembly 20 is a sheet of one or more multilayer loop fastener materials wound around itself in the periphery of the core 22 as described above. It is a roll containing. As shown, the loop tape is wound around the central axis and is generally arranged in a straight line, but a continuous loop tape course can be wound in a suitable manner such as horizontal winding.

The upper adhesive layer generally has a peel strength for the lower loop layer of about 4 to 400 g / cm-width, preferably about 8 to 120 g / cm-width, most preferably about 8 to about 80 g / cm-width. (peel force) As will be appreciated by those skilled in the art, embodiments of the present invention may be prepared to have peel strength outside these ranges, if necessary. In general, however, the peel strength should be less than the internal rupture strength of the nonwoven loop layer 14 or loop tape fastener material so that the loop tape fastener material can be easily dispensed in a form available from the assembly. In general, the loop tape fastener material on the roll has an unwind force of about 4 to about 250 g / cm-width, about 8 to 120 g / cm-width.

The adhesive layer 18 of the inventive loop tape fastener material is a pressure sensitive adhesive. The selection of suitable adhesives is based in part on the substrate to which the loop tape fastener material is attached, the properties of the backing layer, the properties of the loop layer and its constituent loops, the required properties of the loop tape fastener material 12, the loop tape fastener material ( Factors such as conditions of use, 12) exposure techniques, available conversion techniques, and tools for separating loop tape fastener material 12 from the storage / distribution assembly, and for example converting such as cutting or thinning to the required shape. Based on that. The adhesive layer 18 must be tacky at room temperature, adhere as described in the intended substrate to which the loop tape fastener material 12 is applied, and adhere well to the backing 16 or the loop tape fastener material base layer. Suitable adhesives for particular applications can be readily selected by those skilled in the art. Examples of suitable adhesives include acrylates, viscous natural rubber, viscous synthetic rubber resins, and the like. The adhesive layer may form a substantially continuous phase or may have a constant shape if necessary. Appropriate adhesives can be readily selected by those skilled in the art.

The pressure sensitive adhesive is preferably a viscous elastomer wherein the elastomer is a block copolymer of type A-B, wherein the A and B blocks are arranged in a linear, radial or star configuration. The A block is formed of monoalkenylarene and more preferably a polystyrene block having a molecular weight of 4000 to 50,000, preferably 7000 to 30,000. A block content is preferably from about 10 to 50% by weight, preferably from about 10 to 30% by weight block copolymer. Other suitable A blocks can be prepared from alpha methylstyrene, tertiary butyl styrene and other cycloalkylated styrenes as well as mixtures thereof. The Bblock is an elastomer conjugated diene, usually polyisoprene having an average molecular weight of about 5000 to about 500,000, preferably about 50,000 to about 200,000. The B block component is generally 90 to 50% by weight, preferably 90 to 70% by weight. In elastomeric based adhesives, the adhesive component generally comprises a solid tackifying resin and / or a liquid tackifier or plasticizer. Preferably, the tackifying resin is selected from the group of resins that are at least partially compatible with the polydiene B block portion of the elastomer. Although not preferred, generally a relatively small amount of tackifying resin may comprise a resin that is compatible with the A block, and where these resins are present, are generally referred to as end block reinforcing resins. Generally, terminal block resins are prepared from aromatic monomeric species. Liquid tackifiers or plasticizers suitable for use in fastener tape tab adhesive compositions include naphthenic oils, paraffin oils, aromatic oils, inorganic oils or low molecular weight resin oil esters, polyterpenes and C-5 resins. Solid adhesive resins include C-5 resins, resin esters, polyterpenes and the like.

The tackified part of a pressure sensitive adhesive generally contains 20-300 parts with respect to 100 parts of an elastomeric phase. Preferably, this is mainly composed of solid tackifiers, but 0 to 25% by weight, preferably 0 to 10% by weight, of the adhesive may be liquid tackifiers and / or plasticizers.

In general, an additional layer needs to be provided between the nonwoven roof layer and the adhesive layer. 1 shows backing layer 16.

The backing layer 16 provides the adhesive layer 18 with a more manageable surface than the nonwoven loop layer 14 can provide when the backing layer is not used, but is disclosed in Japanese Application No. 7-313213. As such, the backing layer 16 may be provided by fusing the roof layer 14. In most embodiments, the backing layer 16 is a substantially continuous layer, providing a boundary wall between the roof layer 14 and the adhesive layer 18. This prevents undesired blocking of the loop by the adhesive during the multilayer loop material assembly period, for example during which the adhesive layer is flowable than when the storage / distribution assembly is assembled. U.S. Patent 4,994,054 (pigneul) addresses this problem. The backing layer may be selected for the purpose of imparting greater tensile and tear strength to the nonwoven loop tape fastener material.

Suitable backing layers for a particular application can be readily selected by those skilled in the art. Selection of a suitable backing layer may include the required properties of the loop tape fastener material 12, the properties of the loop layer 14 and the adhesive layer 18 to which the backing layer is bonded therebetween, the conditions of use under which the loop material is exposed, and the use. It is in part dependent on possible switching techniques and tools that decouple the loop fastener material from the storage / distribution assembly and make modifications such as cutting or thinly cutting into the required shape. Numerous materials commonly used as tape backing layers are useful. Examples of materials suitable for use as the backing layer herein include polyolefins, polyesters, vinyls, blends thereof, paper, nonwoven webs, and the like. If necessary, a multilayer backing layer can be used. It is also possible to use a foamed backing layer. In a particularly preferred embodiment, the loop tape fastener material backing layer is an extrusion bonded film as disclosed in US Pat. No. 5,256,231. In this case, the nonwoven loop material is fed into a nip formed between two nested surfaces, such as two interrelated mesh spacing rolls. The nonwoven loop material and the plastic backing layer are fed into the gap from the die in a molten state together with another layer on the opposite side of any additional backing layer or molten plastic backing layer. The pressure exerted by the gap impregnates the fibers of the nonwoven roof layer with a plastic backing layer.

Occasionally, the backing layer 16 is used to impart or greatly limit the required tensile strength of the loop tape fastener material 12. In most embodiments, the backing layer 16 has a substrate weight of about 5.0 to 400 g / m ² , sometimes about 10 to about 200 g / m ² , and sometimes about 20 to about 100 g / m ² .

In most embodiments, the backing layer 16 has a thickness of about 5 to about 12,500 microns, with a larger thickness generally being a foamed backing layer. For example, when the backing layer is a polyolefin sheet, a thickness of about 25 to about 500 microns, sometimes about 50 to 250 microns, will be common. It is understood that backing layers having thicknesses outside these ranges may be needed in some embodiments.

The method of the present invention for dispensing " bonding " nonwoven loop tape fastener material comprises (1) preparing a storage / dispensing assembly, as described above, and (2) an adhesive layer of the upper nonwoven loop tape from Separating the upper nonwoven loop tape fastener material from the assembly to be separated, and allowing the loop of the lower nonwoven loop tape fastener material to be removable by the auxiliary hook fastener material.

As previously described, in some embodiments, the adhesive layer of the upper nonwoven loop tape is such that when the upper nonwoven loop tape is detached from the assembly, the adhesive on the tape pulls the lower loop to regenerate them in a bonded state. Adheres sufficiently strong to the loop of the tape.

In embodiments wherein the assembly is a pile comprising two or more sheets of nonwoven loop tape fastener material, the method of separating the upper portion of the nonwoven loop tape fastener material includes simply peeling the sheet from the pile.

In embodiments where the assembly is a roll comprising one or more sheets of spirally wound loop tape fastener material, in other cases with respect to itself, separating the upper portion of the nonwoven loop tape fastener material simply removes a portion of the nonwoven loop tape fastener material. It may include the step of releasing from the roll. In some embodiments, when the upper loop tape is unwound, the adhesive of the upper loop tape is pulled upwards on the loop of the lower loop tape so that the adhesive exhibits sufficiently strong adhesion to the loop in order to recover these loops into a bondable state. It may be desirable. In this regard, it may be desirable for the roll to have a certain loosening force.

Generally, after separating a portion of the nonwoven loop tape fastener material from the assembly, the loop tape fastener material is cut as needed and then bonded or attached to the substrate having the pressure sensitive adhesive layer.

This loop tape fastener material can be used for other purposes than loops for hook and loop fastener systems, if desired. For example, it can be used as a decorative tape, wall covering, or fastener tape. However, this loop tape can still be combined with hook fasteners.

The storage / dispensing assembly of the present invention can be manufactured in various sizes and embodiments as needed. Since their stability is so amazing, the rolled assemblies of the present invention can be readily manufactured and handled using sheets having almost all the required widths. For example, rolls made from sheets 2 inches (5 cm) wide or less are actually handled. Rolls wound around a central axis are generally made of sheets having a width of at least 1 cm. Previously, rolls with such small widths wound around the central axis were very difficult to handle because of the minimal interlayer adhesion generally derived from the release liner. Rolls of larger width sheets can also be produced according to the invention. In addition, large volume rolls, such as a 20 inch (0.5 m) or more roll radius having a layer of hundreds or thousands of upper loop fastener materials (ie, a loop measured radially from the center or core of the roll) Rolls with a radius of fastener material). Unlike conventional rolls of loop fastener material, the rolled assemblies in the present invention typically do not have familiar side shields attached to one or both ends of the roll core to help prevent overlapping of the concentric rolls during handling. Can be prepared. Similarly, the dummy assembly of the present invention having similar dimensions can be produced.

Test Methods

135 degree peel adhesion experiment

A 135 degree peel adhesion experiment was used to measure the amount of force needed to peel a strip of hook fastener material from a sample of loop fastener material. The experiment was conducted at a constant temperature and humidity in a room set at 23 ° C. and 50% relative humidity.

For the experiment, a 2 inch by 5 inch (5.08 cm x 12.7 cm) specimen of loop fastener material coated with pressure sensitive adhesive is fixed so that the adhesive side rests on a 2 inch by 5 inch (5.08 cm x 12.7 cm) steel panel. The loop fastener material is placed on the panel in the transverse direction of the loop material parallel to the long dimension of the panel. A 0.75 inch by 1 inch (1.90 cm x 2.54 cm) strip of hook fastener test material (XMH-5145, commercially available from 3M) with an attached paper reader was then looped so that the leading edge of the hook strip was along the length of the plate. Located on the center. This sample was rolled using a 4.5 pound (1000 g) rubber roller by hand once in each direction. The sample panel was then placed in a 135 degree peel jig, which was placed in the bottom jaw of the constant velocity extended tensile tester INSTRON. Without prior peeling of the sample, the end of the paper reader was placed in the upper jaw of the tensile tester so that there was no loosening of the leader. At a crosshead speed of 12 inches per minute (30.5 cm), the chart recorder was used to record peels maintained at 135 degrees. The load required to separate the hook fastener strip from the loop fastener material was recorded. Reported values are averages of 8-10 experiments.

Solving Experiment

The loosening experiments provide an estimate of the amount of force it takes to unroll the roll of loop fastener tape.

The rolls (7.6 cm wide) of the loop fastener tapes tested were kept at 23 ° C., 50% relative humidity for 24 hours. Three wraps of loop tape were removed from the roll and the tape was folded at the free end to form a tab. A release tool with an open axis of rotation was placed in the lower jaw of the constant speed extension tensile tester INSTRON to confirm that the axis rotated freely. At the crosshead speed of 20 inches (50.8 cm) per minute, the average unwind value required to unwind a loop tape of approximately 6 inches (15.24 cm) using a chart recorder set at a chart speed of 10 inches (25.4 cm) per minute. Recorded. The solver values in Table 2 were reported in g / 2.54 cm width and averaged two or more independent measurements.

Fiber Delaminate Experiments: 180 Degree Peel Adhesion and 90 Degree Peel Rebonding

Fiber delamination experiments are used to check for fiber contamination and subsequent contamination of loop tape pressure sensitive adhesives.

A 2 inch by 5 inch (5.08 cm by 12.7 cm) specimen of the loop tape being tested was fixed with the adhesive side on a 2 inch by 5 inch (5.08 cm by 12.7 cm) steel panel. The 1 inch (2.54 cm) wide specimen of the pressure sensitive adhesive test tape with the attached paper leader is then placed in the center of the loop material such that the leading edge of the adhesive test tape is along the length of the panel. The test tape adhesive was a pressure-sensitive adhesive (XMF-4065, commercially available from 3M) of an adhesive styrene isoprene type block copolymer.

The sample was rolled using an 11 pound (5.3 kg) roller by hand once in each direction. The sample panel was then placed in the bottom jaw of the constant speed tensile tester INSTRON. Without prior peeling of the sample, the end of the paper reader was placed in the upper jaw of the tensile tester so that there was no loosening of the leader. At a crosshead speed of 12 inches per minute (30.5 cm), the chart recorder was used to record delaminations held at 180 degrees. The load taken to separate this test tape from the loop fastener material was recorded. The results reported in Table 2 are in g / 2.54 cm width. These values are the average of two or more independent measurements.

In order to examine the degree to which the pressure sensitive adhesive became non-adhesive due to the fiber yarn transferred from the loop fastener material, a 90 degree peel readhesion test was performed on the smooth polyethylene film surface of the tape that was adhered to the loop material. The test was also conducted with 90 degree peel re-adhesion in a nonwoven laminate used as diaper outer cover on Pampers ^™ Premium Infant Diapers of this tape.

90 degree peel re-adhesion :

A 13 mil (330 micron) specimen of smooth polyethylene film was bonded to a 2 inch by 5 inch (5.1 cm by 12.7 cm) steel panel using double coated adhesive tape. The contaminated adhesive test tape was placed in the center of the polyethylene film surface with the adhesive side down, and the tape was wound by passing through a 100 g rubber roller twice. The panel was placed in the fixture, and then the release tape was placed in the upper jaw while the fixture was placed in the bottom jaw of the constant speed extended tensile tester INSTRON. The steel panel was set to move the upper jaw at a constant crosshead speed of 12 inches per minute (30.5 cm) while moving the release tape to maintain a 90 degree angle to the panel. These tests were performed at a constant temperature of 21 ° C. and a relative humidity of 50%. The force required to separate this contaminated tape from the polyethylene film was recorded as the regluing value. The test was carried out in a similar manner except that a 4.5 pound (2.2 kg) rubber roller was used for the roller operation when peeled from the nonwoven material. Reattachment experiments in Table 3 were reported in units of g / 2.5 cm width. The result is the average of two or more independent measurements.

Example 1-5, Example 9-12, Comparative Example 6-8, and Example 13

The loop fastener materials of Examples 1-5 and Comparative Examples 6-8 are US patents, except that a roll spacing of 0.002 inches to 0.003 inches (0.005 cm to 0.008 cm) is used between the roll 25 and the roll 26. It was prepared according to the method described in Example 3 of No. 5,256,231 and shown in Fig. 6. The backing layer sheet attached to the plastic backing layer side opposite the fiber sheet was a 1.2 mil (30.5 micron) thick cast polypropylene printing film. The polypropylene resin used to extrude the plastic backing layer was an impact copolymer of polypropylene and polypropylene (commercially available from # 7C50 Union Carbide). The substrate weight of the example plastic backing layer was 45-48 g / m ² . The loop material was a fluff web type made from the fibers listed in Table 1.

The fibrous loop side of the loop fastener material was corona treated to have a surface energy of greater than about 33 dyne / cm and then coated with a release material. The release material used was a release material in the form of a polyorganosiloxane polyurea copolymer similar to that described in US Pat. No. 5,290,615. This peeling coating thickness (or coating weight) was about 0.4-0.8 g / m <^2> . The pressure sensitive adhesive was then hot melt coated on the back side opposite the fibrous loop. The adhesive used was the same viscous styrene isoprene type block copolymer pressure sensitive adhesive that was used on the adhesive test tape in the fiber delamination test described above. The adhesive coating thickness was about 38 microns. The loop fastener material was then wound in roll form without release liner.

Examples 9-12 and Comparative Example 13 are identical to those of Examples 1-4 and Comparative Example 8 except that the corrugating rollers are designed or modified to produce a loop material sheet having a hexagonal bond instead of a linear bond. Run in the manner. The hexagon was about 5 mm wide with anchors or joints about 1 mm wide.

Table 1 summarizes the fiber shapes and sizes used to prepare the fluff-like sheets of fibers for all loop fastener materials used in the Examples and Comparative Examples. Also provided are weight ratios for Examples 4, 5 and 12 using fiber blends. In all examples the substrate weight of the fiber sheet (after wrinkle formation) was 48 g / m ² .

Example Fiber type & size 1 and 9 15 denier EC-486 ¹ 2 and 10 18 denier EC-698 ¹ 3 and 11 25 denier EC-699 ¹ 4 and 12 30 denier T-182 ^2/9 denier T-196 ² formulation (75: 25) 5 15 denier EC-486 / 30 denier T-182 / 9 Denier T-196 Formulation (50:25:25) C6 3 denier T-196 ² C7 6 denier T-196 ² C8 and C13 9 denier T-196

¹ EC-486, EC-698, EC-699 are polypropylene staple fibers with a fiber length of 1 7/8 inch (4.76 cm) and are commercially available from Synthetic Industries.

² T-196 and T-182 are polypropylene staple fibers with a fiber length of 1 7/8 inch (4.76 cm) and are commercially available from Hercules Inc.

In all the examples the loosening test and fiber delamination test were carried out according to the test method described above. The results are summarized in Table 2.

Example Loosening test 180 degree peel adhesive 90 degree peel re-adhesion to polyethylene 90 Degree Peeling Regluing for Nonwovens One 80 309 683 998 2 68 199 648 1068 3 62 146 699 1216 4 69 210 631 1302 5 64 198 680 1162 C6 193 2428 6 371 C7 164 1823 16 416 C8 124 1858 45 342 9 61 387 665 1053 10 51 181 780 1117 11 41 87 811 1112 12 71 264 678 950 C13 104 1609 29 232

Compared with those made of high denier fibers (Examples 1-3 and 9-11) or those made from a combination of low denier and high denier fibers (Examples 4, 5, and 12), In the prepared examples (C6, C7, C8 and C13) very high unwinding and 180 ° peel adhesion values were obtained. This suggests that the pressure sensitive adhesive is strongly adhered to the lower denier fibers, so that upon separating it from the lower loop tape fastener material, fiber contamination occurs in the adhesive layer of the upper loop tape fastener material. As a result fiber yarn contamination of the upper loop tape adhesive; And correspondingly, the adhesion of the loop tape to the polyethylene and the nonwoven substrate is reduced. This is confirmed by a significantly lower (less practically) rebonding test value in the examples made of denier fibers with a low 90 degree peel rebonding value.

In Examples 1 and 5, a 135 degree peel adhesion test was also performed. Test results were 639 g / 2.54 cm wide and 352 g / 2.5 cm wide, respectively. This experiment demonstrates that loop materials made of high denier fibers will function well as loop fastener portions of hook and loop fasteners.

Examples 14, 15 and Comparative Example 16

Examples 14, 15 and Comparative Example 16 were compared with Examples 1-5 and previously described, except that the preformed backing layer was thermally bonded to the corrugated fiber sheet instead of extruding and attaching the plastic backing layer to the fiber sheet. It was run in a similar manner as in Example 6-8. Thermally bonded loop materials of this type and methods for their preparation are generally described in EP 341 993 B1. The substrate weight (after wrinkle formation) of the fiber sheet in these Examples was 35 g / m <^2> . The film backing layer to which the loop material was thermally bonded was a 1.2 mil (38 micron thick) cast polypropylene film. The fiber shape and size used to prepare the loop fastener material are listed in Table 3 along with the experimental values of 90 degree peel rebonding to polyethylene.

Example Fiber type and size 90 degree peel re-adhesion to polyethylene 14 15 denier T-182 548 15 15 denier T-182 / 9 denier T-196 (75:25) 508 C16 9 denier T-196 265

As in the above examples, the 90 degree peel rebonding values for polyethylene were compared with Examples 14 and 15, prepared from blends having 75% by weight of high denier fibers (15 denier) or high denier fibers (15 denier). Very low in Comparative Example 16 (made of low 9 denier fibers). This represents adhesive contamination that occurs because the fibers migrate from the loop material after contact with the pressure sensitive adhesive is made.

Claims (9)

Non-woven loop tape material assembly comprising one or more multilayer sheets of non-woven loop tape fastener material usable as a loop portion of a hook and loop fastener ( non-woven loop tape material assembly, The nonwoven loop tape fastener material comprises (1) (a) a plurality of flexible fiber loops suitable for releaseable engagement by complementary hook portions of the hook and loop fasteners, and (b) a nonwoven loop layer forming a first major surface comprising a base layer and / or a backing layer to which the nonwoven loop is secured; And (2) a pressure sensitive adhesive layer that sequentially forms the second major surface, Some or all of the nonwoven roof layer is made of fifteen to fifty denier fibers; The adhesive layer of the overlying nonwoven loop tape fastener material is provided in an underinging loop (the lower loop is in an engageable state when the upper nonwoven loop tape fastener material is removed from the assembly). And the nonwoven loop tape fastener material is arranged in the assembly such that the nonwoven loop tape fastener material is in direct contact with the nonwoven loop layer of the lower nonwoven loop tape fastener material. The method of claim 1, And wherein the lower loop is compressed by an upper nonwoven loop tape fastener material arranged in the assembly, and the compressed lower loop is restored to an engaged state after removal of the upper nonwoven loop tape fastener material. The method of claim 1, The adhesive layer of the upper nonwoven loop tape fastener material exhibits a peel force of 4 to 250 g / cm-width relative to the lower loop layer. The method of claim 1, The adhesive layer of the upper nonwoven loop tape fastener material exhibits a peel strength of 8 to 80 g / cm-width relative to the lower loop layer, wherein the assembly comprises one or more sheets of nonwoven loop tape fastener material wound thereon. (roll), wherein the sheet of nonwoven loop tape fastener material on the roll exhibits an unwind force of 8 to 120 g / cm-width. The method of claim 4, wherein The nonwoven loop tape material assembly of which the roll has a radius of 50 cm or less. The method of claim 1, The nonwoven loop tape material assembly of claim 1, wherein the nonwoven loop layer comprises a backing bonded between the roof layer and the adhesive layer. The method of claim 1, Nonwoven roof layer a) 25 to 100% by weight of 15 to 50 denier fibers; And b) a nonwoven loop tape material assembly consisting of 0 to 75% by weight of less than 25 denier fibers. The method of claim 1, Nonwoven roof layer a) 50 to 100% by weight of 15 to 30 denier fibers; And b) a nonwoven loop tape material assembly consisting of 0-50% by weight of less than 25 denier fibers. The method of claim 1, The pressure-sensitive adhesive layer is composed of a tackified elastomer adhesive (the elastomer is composed of 10 to 50% by weight of an A block made of monoalkenylaren and 90 to 50% by weight of a B block made of conjugated diene. AB type block copolymer; And imparted with a tackifier comprised between 20 and 300 parts by weight relative to 100 parts of elastomer.