MXPA97000386A - Tape holder tape - Google Patents

Abstract

A disposable tape tab for a diaper or similar article is provided with at least one fastening tape tab portion (5) and a release tape tab portion (4), the fastening tape tab portion having a fastening tape surface. clamping (7), clamping surface which (7) is on a face opposite the face of the adhesive surface (10) of the release strip tab portion (84). The fastening tape tab portion (5) and the release tape tab portion (4) are joined by at least one bond of adhesive to the substrate (13) without contacting the adhesive layer with the adhesive layer. Preferably, the clamping surface (7) on the clamping band tongue (5) is a pressure-sensitive adhesive, both with the clamping band tongue (5) and the strip of detachment tape (4) having a release layer on the face opposite the face having the adhesive layer

Description

BANDING STRAP FOR PANALES, / - The present invention relates to an adhesive closure fastening tape and release tape structure for use in a disposable diaper or incontinent adult article. The fastening tape and the release tape are designed to be provided as separate tape elements, which can be assembled by a manufacturer of diapers on -if- the diaper production line. Many of the original disposable diapers used tape tabs to hold pressure-sensitive adhesive. The adhesive on the free end, or the outer end of the fastening tape tab required the protection from contamination before use. This protection was provided with a disposable release liner. However, those first disposable release liners were considered undesirable for a number of reasons including; its inconvenience, difficulty of use, and fear of "a baby inadvertently swallowing the disposable, detachable release liner. In response to these problems, a number of patent applications were submitted to various means to eliminate or modify the Disposable release liner. Some of those REF: 23849 patents are discussed in U.S. Patent No. "4,168,196, U.S. Patent No. 4,168,196 is directed to an alternative method for removing the disposable release liner to minimize the amount of substrate film used. in the formation of the tape tab for fastening diaper.A single substrate film is an area coated with adhesive and release material on the faces and opposite ends of the substrate.There are two adhesive regions on two different faces, and opposite ends , of the substrate with two release coated regions provided opposite the adhesive regions, so that the substrate can be rolled up like a tape with the two adhesive regions in contact with the two release coatings. The fastening tape is adhered to the nonwoven top sheet of the diaper with an adhesive region. The second adhesive region on the opposite end of the fastening tab is attached to the back sheet of the adhesive. diaper by the user. This system, although relatively simple to use by the diaper manufacturer, is extremely difficult to manufacture, since it requires a complicated zonal coating of two separate release liners and two adhesive layers on a single support or substrate reinforcement.

A more typical method was the use of a separate "fastener tape" and detachment tape or release liner where the release tape or release liner is permanently secured to the diaper, the tape tab or both. For example, U.S. Patent No. 3,955,576 proposes to attach a fastening tape to a release tape, release tape which is also permanently attached to the upper sheet of the diaper, creating a bond between the fastening tape to the diaper. detachment tape by overlaying the tape to form an adhesive-to-adhesive contact region between the two tapes US Patent No. 4,237,890 provides a release liner, which is permanently attached on one side to a central section or area of a fastening tab. A final section of the retaining tab is removably attached to the release liner and the opposite end section of the fastening tab is permanently attached to the back sheet of the diaper. The ribbon sheet could apparently be provided as a folded prelaminate structure. Another folded prela inada structure is described in US Pat. No. 4, 726,971 wherein a release tape is secured to a fastening tape by means of a unifying strip. The fastening tape and the release tape are permanently attached to the opposite faces of the diaper. The final fastening section of the fastening tape tongue is releasably secured to the release surface of the release tape. The end of the fastening tape tab permanently attached to the diaper is provided with a more aggressive, different adhesive layer. U.S. Patent Nos. 4,060,085 and 4,029,098 propose a release liner which is adhesively secured to a central portion of the lining tape tab at one end with the majority of the liner thermally sealed to the face of the upper sheet internal diaper. Those 5 constructions are much more difficult for a diaper manufacturer to implement and the thermal seal of the diaper release liner can effectively destroy the release characteristics of the release surface. The present invention is directed to provide a low cost, pressure sensitive adhesive fastening tape and a release tape system, both of which are simple to manufacture by the diaper manufacturer and simple and inexpensive to be used in diapers in the manufacture r of a diaper tape closure system.

BRIEF DESCRIPTION OF THE INVENTION According to the present invention, a disposable diaper or incontinent adult article is provided with a pressure-sensitive adhesive tape closure system comprising a sheet of closure tape of a fastening tape tab portion and a portion of a fastener tape. detachment tape tab. Each portion of tape tab has a first side with an adhesive layer and a second opposite face without an adhesive layer. The second faces preferably have a release layer which allows the fastening tape, the release tape and / or the closure tape sheet to be wound on a roll of tape and subsequently unwound. When the sheet of closure tape is formed, with the two ribbons flat and in the same plane, the two faces of the first tape tab portions are in face-to-face and partially overlapped relationship. The two tape tab portions are connected to each other by means of a Small portion of either of the adhesive layer of the fastening tape tab portion or the adhesive layer of the release tape tab portion, or both, so that there is no adhesive contact between the two adhesive layers.

When in use, the tape tab portion And detachment of closure tape sheet is adhered to the diaper upper sheet (the liquid permeable inner layer) with the adhesive layer of the portion of the release tape tab. The adhesive layer of the fastening tape tab portion is releasably secured to a release surface on the second face of the release tape tab portion so that the fastening tape portion • of the fastening tape can be fastened to the fastener tape. removably to the second side of the strip portion of the release tape and subsequently adhering to the back sheet of the diaper the diaper closure. ] 5 BRIEF DESCRIPTION OF THE DRAWINGS Figure 1 is a side cross-sectional view of a first embodiment of the closure tape sheet of the invention on a side edge of the diaper. Figure 2 is a side cross-sectional view of a second embodiment of the closure tape sheet of the invention on a side edge of the diaper. Figure 3 is a side cross-sectional view of a third embodiment of the diaper closure tape sheet.

Figure 4 is a side cross-sectional view of a fourth embodiment of the closure tape of the invention on a side edge of the diaper. Figure 5 is a side cross-sectional view of a fifth embodiment of the closure tape of the invention on a side edge of the diaper. Figure 6 is an alternative placement of the embodiment of Figure 4 inward of the lateral edge of the diaper. Figure 7 is a side cross-sectional view of the embodiment of Figure 1 as it would be seen before use.

DETAILED DESCRIPTION OF THE PREFERRED MODALITIES The pressure-sensitive adhesive tape tab closure system of the present invention will be described generally with reference to disposable diapers and incontinent adult articles, however, the closure tape sheets of the invention could be applicable to other disposable garments or closure systems for example in packaging, such as for an individual sanitary wrapping.

Figure 1 describes a first embodiment of the present invention wherein the closure tape sheet comprises a release tape tab portion 4 and a tape portion of fastening tape 5. The closure tape sheet is attached to a edge portion of a diaper chassis 1 comprising a liquid-permeable top sheet layer 2 and a liquid-impermeable backing sheet layer 3, two layers (2 and 3) which comprise the edge region External of the diaper case 1. This outer edge region is where a closure tape is joined in a conventional manner. The two tape tab portions (4 and 5) are joined together to a layer bonding area (7 or 10) to the substrate 13. The release tape tab portion 4 comprises a substrate 9 provided with a surface of detachment 11 on a second face with a first face coated with a pressure sensitive adhesive layer 10. The substrate 9 can be any conventional film, such as a small film or multiple layers of polymer or thermoplastic polymers, such as polyolefins. Also the nonwoven or woven fabrics can be coated or laminated by extrusion to additional layers, paper, films or the like to form the substrate 9. The release surface 11 could typically be a release liner, which could be any conventionally used type. as a release liner on a release tape or diaper release liner. The pressure sensitive adhesive layer 10 was formulated with an adhesive which will permanently bond the release tape tab portion 4 to the upper sheet of the diaper 2 and could conventionally be an adhesive of the rubber adhesive or synthetic rubber resin type. A preferred adhesive could comprise that described in US Patent Application Serial No. 08 / 249,732 (Gobran), which discloses an adhesive comprising 100 parts of an elastomeric phase having 78-98 parts of a block copolymer of the two-block type AB, elastomeric, predominantly of polystyrene, or derived from polystyrene, blocks A, and blocks B of poly-1,3-butadiene. The remaining portion of the block copolymers of type A-B of multiple elastomeric phase blocks of three or more blocks is preferably a three-block copolymer ABA with e-block B of a poly-1,3-butadiene. The elastomeric phase is adhered with a mixture of a solid adhesive resin and a liquid oil or adhesive, at least partially compatible with the B blocks to provide an adhesive having a glass transition temperature of the composite block (CMTg) of less than - 10 ° C. Other pressure sensitive adhesives of synthetic rubber or natural rubber adhered can be used provided the initial release at 135 ° (tested in accordance with that described in US Patent Application Serial No. 08 / 249,732) to the upper sheet of the diaper (for example a non-woven fabric) is at least 100 gm / in, preferably at least 150 gm / in. The fastening tape tab portion 5 is likewise comprised of a substrate 6, which can be any suitable substrate, such as those described for the substrate of the release tape tab portion 9. The adhesive layer of the release tab The fastening tape 7 can be any conventional pressure sensitive adhesive used on a diaper fastener tape. In a preferred embodiment, a less aggressive adhesive was used than the adhesive of the fastening tape with at least one adhesive-free region provided on the first face coated with adhesive of the substrate 6. This adhesive-free region was used to form the bonding of the adhesive. substrate to the adhesive layer 13 between the pressure-sensitive adhesive layer of the release tape tab portion 10 of the substrate of the fastening tape tab portion 6. Optionally a second adhesive-free adhesive-sensitive region can be provided. pressure at the opposite end of the fastening tape tab portion 5 to provide a portion of the adhesive-free release finger for removing the fastening tape tab portion 5 from the release tape tab portion 4 of the surface of detachment 11, or a suitable joint region on the frame of the diaper 1, or the like. Generally, the fastening tape tab portion 5 is further provided with a release layer 8 that allows the fastening tape tab portion, or the fastener tape sheet that includes the tape tab portion of the fastener tape. 5, is formed of a roll of tape substrates coated with pressure sensitive adhesive (9 and / or 6). Less aggressive adhesives are required for the retaining tape tab portion (5) when the retaining tape tab portion (5) adheres directly to a thin film, or similar, support sheet layer to form the diaper closure. Thus, for example, the thin film is generally a polyethylene polymer, copolymer or mixed film. A low adhesive adhesive for releasably adhering to a thin film is based on free radical polymerizable acrylate pressure sensitive adhesives, preferably prepared by an emulsion polymerization process. These acrylates are typically the alkyl acrylates, preferably monofunctional unsaturated acrylate esters of tertiary alkyl alcohols, the alkyl group of which has from two to about 14 carbon atoms providing a polymer having a Tg of less than 0 ° C, preferably less than -10 ° C. Included within this class of monomers are, for example, isooctyl acrylate, isononyl acrylate, 2-ethylhexyl acrylate, decyl acrylate, dodecyl acrylate, n-butyl acrylate, and hexyl acrylate. The alkyl acrylate monomers can be used to form homopolymers or can be copolymerized with polar copolymerizable monomers or monomers of high Tg (greater than that of the alkyl acrylate) such as vinyl esters, Ci-alkyl esters of acid (methyl) ) acrylic and / or styrene. When copolymerized with moderately polar monomers, the alkyl acrylate monomer generally comprises at least about 70% of the polymerizable monomer composition. The high Tg monomers can be used in amounts of up to 20% of the polymer composition, preferably 3 to 15%, more preferably 6 to 10%. The polar copolymerizable monomers may be selected from strongly polar monomers such as monoolefin mono- and dicarboxylic acids, hydroxyalkyl acrylates, cyanoalkyl acrylates, acrylamides or substituted acrylamides, or moderately polar monomers such as N-vinyl pyrrolidone, acrylonitrile, vinyl chloride. or diallyl phthalate. The strongly polar monomer preferably comprises up to about 25%, more preferably up to about 15%, of polymerizable monomer composition. The moderately polar monomer preferably comprises up to about 30%, more preferably from about 2% to about 20% of the polymerizable monomer composition. Optionally a low molecular weight hydrophobic polymer can be added to the monomers of the adhesive matrix to improve the stability of the emulsion. These polymers could have an average molecular weight of about 400 to 50,000, and include polystyrene resins, poly (methyl methacrylate) resin, polybutadiene, polyisoprene, poly (alpha-methyl), polydiene-polyaromatic arene copolymers, resin esters and mixtures thereof. These could be added in amounts of 20% of the monomer mixture, preferably 0-10 percent. Copolymerizable ionic surfactants are also useful for improving cohesive strength and moisture resistance. These include polyalkylene polyalkoxy ammonium sulfate (eg, "MAZON" SAM-211 available from PPG Industries) and the alkyl allyl sulfosuccinates, (eg, "TREM" LF40 available from Diamond Shamrock Co.) as well as those described in US Pat. PCT Application No. 89/12618, US Patent Nos. 3,952,442 and 3,983,166, incorporated herein by reference. Other non-copolymerizable ionic and nonionic surfactants other than those above or in mixtures can be used in place of the copolymerizable surfactants, although they are less preferred. The surfactants can be used in amounts from zero to 10% of the total monomer mixture, preferably from 1.5 to 5 percent. The pressure sensitive adhesive matrix of the invention also contains an initiator to aid polymerization of the monomers. Suitable initiators include thermally activated initiators, wherein the initiator can be soluble in water or oil. Suitable oil soluble initiators include azo and diazo compounds, Hydroperoxides, peroxides and the like. Water-soluble initiators include persulfates such as potassium persulfate. Generally, the initiator is present in an amount of about 0.01 percent to about 3.0 percent, preferably 0.1. to 5 percent, based on the total monomer component. Where higher cohesive forces are desired, the pressure sensitive adhesive matrix can also be crosslinked. Preferred crosslinking agents for the acrylic pressure sensitive adhesive matrix are multifunctional acrylates such as 1,6-hexanediol diacrylate, as well as those described in U.S. Patent No. 4,379,201 (Heilmann et al.), Incorporated herein by reference. Each of the crosslinking agents is useful in the range of about 0.01% to about 3%, preferably 0.1 to 1 percent of the total components. Other useful materials that can be mixed in the adhesive matrix include, but are not limited to, fillers, pigments, plasticizers, adhesives, fibrous reinforcement agents, foaming agents, antioxidants, stabilizers, flame retardants and rheology modifiers. Chain transfer agents, such as carbon tetrabromide, mercaptan or alcohols in the monomer mixture can be used to adjust the molecular weight of the monomer. The adhesive was formulated by mixing water and the monomers with the optional hydrophobic polymer, surfactants, the chain transfer agent, the crosslinker and then heating under an inert atmosphere, (free of 02) while treating with the initiator. The mixture of the reaction latex can be mixed with other optional additives and coated with microspheres, as discussed below, as an adhesive blend by any conventional method.

The substrate 6 can be treated, such as by a corona discharge, to improve adhesion by the microsphere / adhesive matrix. The acrylate pressure sensitive adhesive matrix may also contain adhesive microspheres in an amount ranging from 1 to 40 parts of microspheres to 99 to 60 parts of adhesive matrix, preferably 1 to 20 parts of microspheres. The solvent evidently elastic or adhesive and insoluble in water (since a portion of the polymer is water and insoluble solvent) dispersible in solvent or water, polymeric microspheres was formed mainly from the monomers polymerizable by free radicals preferably capable of forming homo or copolymers which have glass transition temperatures or melting transition temperatures generally lower than -10 ° C. Preferred are vinyl esters, acrylates and methacrylates which will produce homopolymers or copolymers having glass transition temperatures of less than 0 * C preferably less than -10 ° C. Suitable acrylates and methacrylates include isooctyl acrylate, isononyl acrylate, isoamyl acrylate, 2-ethylhexyl acrylate, n-butyl acrylate and sec-butyl acrylate; other acrylates and methacrylates can be used provided that the total Tg is less than specified, these other monomers include terbutyl acrylate, isobornyl acrylate, butyl methacrylate, vinyl acetate, acrylonitrile, isononal acrylate, isodecyl acrylate, methacrylate isodecyl, sec-butyl acrylate, isoamyl acrylate, 2-methylbutyl acrylate, 4-methyl-2-pentyl acrylate, isodecyl acrylate and ethyl acrylate; mixing thereof with vinyl esters and other suitable comonomers, such as styrene and substituted styrene or polar monomers. Hydrophilizing agents or components can also be used with the monomers and produce microspheres with pendant hydrophilic portions. Hydrophilizing agents can act as crosslinkers when they are multifunctional. Preferred are hydrophilic oligomers that react by free radicals (a polymer that has a low number of repeated units, generally from 2 to 20) and / or polymers (having more repeating units than an oligomer) including but not limited to those selected from the group consisting of poly (alkylene oxides), such as poly (ethylene oxide), poly (vinyl methyl ether), poly (acrylamide), poly (n-vinylpyrrolidone), poly (vinyl alcohol), cellulose derivatives and mixtures thereof. The microspheres preferably comprise at least 70 parts of at least one free radically polymerizable monomer, optionally up to about 30 parts of one or more polar monomers (generally somewhat soluble in oil and water soluble such as olefinic monocarboxylic acids or dicarboxylic acids). similar to acrylic acid) and from about 0 to about 30 parts of at least one hydrophilizing component. Additional multifunctional initiators and / or crosslinkers and other additives may also be used in addition to the above, as required. More preferably, the microspheres comprise from about 80 to about 100 parts, more preferably from 90 to 100 parts, of free radical polymerizable monomer selected from the group consisting of alkyl acrylate esters, alkyl methacrylate esters, vinyl esters, and mixtures thereof wherein the alkyl group is a C to C2 alkyl, optionally from about 0 to about 10 parts of at least one polar monomer, and optionally from about 0 to about 10 parts of a hydrophilizing component. More preferably, the microspheres comprise from about 95 to about 99.9 parts of free radically polymerizable monomer, from about 0 to about 5.0 parts of a hydrophilizing component, and optionally from about 0.1 to about 5.0 parts of polar monomer. The microspheres could be hollow or solid as is known in the art.

The microspheres typically have average diameters of at least about 1 micron, preferably in the range of about 1 to about 300 microns, and more preferably of about 1 to 150 microns, or more preferably 20 to 150 microns . When the microspheres are hollow, the voids typically range in size from less than one micron to approximately 100 microns or more. When this acrylate adhesive is used on the ; . The tape portion of the fastening tape generally forms a bond of adhesive to the substrate of the adhesive layer of the release tape tab portion. This acrylate adhesive can also be used on at least the free ends of the tape tabs for hold familiar diapers. In the embodiment of Figure 1, the fastening tape tongue portion is secured to a portion inward of the distal side edge of the diaper case 1 by providing a region 15, which is superimposed on bonding area of substrate adhesive 13. Generally, the release tape tab portion 4 can be placed anywhere inboard of the outer side edge of the diaper case 1, such that at least a portion of the portion Retaining tape tab 5 extend outward beyond the side edge of the diaper case 1.

In the embodiment of Figure 2 identical numbers indicate the identical elements shown in Figure 1. The adhesive-free substrate region is provided on a distal end portion of the release strip tab portion 24 in place of the portion of the adhesive tape. fastening tape tab 25 as in Figure 1. The bonding area of the adhesive to the substrate 23 lies between the substrate 9 of the release tape tab portion 24 and the adhesive layer of the fastening tape tab portion. 27. The adhesive layer 20 of the release tape tab portion 24 is the coated area to provide an uncoated substrate region to form the bonding of the adhesive to the substrate 23. The adhesive layer of the tape portion of the fastening tape 27 could be the coated area to provide the substrate region free of adhesive. In the embodiment of Figure 3 the bonding of the adhesive to the substrate is formed by means of an intermediate binding substrate 38, which is bonded directly to the adhesive layer of the release tape tab portion 30 and the adhesive layer of the adhesive. tab portion of fastening tape 37 creating two bonding portions of the adhesive to the substrate 33. In this embodiment both the release tape tab portion 34 and the fastening tape tab portion 35 are formed with the substrates (6 and 9) completely coated with the adhesive layers 30 and 37. The adhesive-free release finger region 39 is created by attaching a release finger substrate 31 to a distal end portion of the fastening tape tab portion 35. detachment finger substrate 31 could be used to form a detachment finger in any of the other embodiments of the invention as would be apparent to one skilled in the art. Figure 4 illustrates a fourth embodiment of the invention wherein the adhesive-free substrate region 42 is elongated, which could be suitable for the release tape tab portions 44 provided with more aggressive adhesive layers 40. In Figure 5 , variation of the embodiment of Figure 4, the adhesive-free substrate region 52 is elastic, which can be achieved by using suitable elastic substrates 59 formed of an elastic film or fabric by selecting a film or fabric that is selectively elastic to the substrate. less in the adhesive-free substrate region 52 that does not form the bonding area of the adhesive to the substrate 53. Figure 6 is an alternative bonding portion for the embodiments of Figures 4 and 5.

Figure 7 is a description of the mode of Figure 1 as it might appear in a folded form before use. The sheet closure tape of the invention can be easily formed by separately laminating a release tape tab portion with a tab portion of fastening tape on the diaper line from the separate tape components provided in the form of a tape. roll. However, alternatively the ] 'foil closure tape could be provided in the form of prelaminate roll and cut directly into tabs by .the manufacturer of the diaper. Direct bonding of the adhesive to the substrate provides a secure bond between the two tape tab portions without the risk of cohesive failures generally created by the direct bonding of adhesive to adhesive. The use of detachment and fastening tape tab portions separately provides the "opportunity to formulate the adhesive layer of the release tape tab portion to join The tape permanently closes the foil closure tape to one end while allowing the adhesive layer of the fastening tape tab portion to be formed to be releasably secured to a diaper backing or reinforcement foil or the like in a fastener system. diaper tape closure 'or resubstantible. However, the adhesive on the tab portion of the fastening tape can become more aggressive when the backing sheet or similar surface is adequately reinforced as is known in the art. With a diaper or the like provided with an outer fibrous fabric engageable with a male mechanical fastener the tab portion of fastening tape can be provided with a male mechanical fastener on the first face. The male mechanical fastener can be attached to the tongue portion of fastening tape with the layer -F? adhesive of the fastening tape tab portion. The male mechanical fastening element can cover all or just a portion of the adhesive layer of the fastening tape tab portion. Alternatively, the tongue portion of The fastening tape can be formed from a male mechanical fastener provided with a region on the first free face of the mechanical fastening structures, such as hooks or mushroom-shaped structures, to form the bonding of the adhesive to the substrate. With those In some embodiments, the release tape tab portion need not have a release surface if no portion of the adhesive layer of the fastener tape tab is exposed. In addition the tongue portion of the release tape can be shortened allowing the mechanical fastening structure of the male mechanical fastening element to engage the fibrous upper sheet layer of the diaper 2 when the fastening tape tongue portion is bent over the release tape tab portion.

Example and Comparative Example Pressure sensitive adhesive tapes (PSA) were prepared by solvent coating a PSA on the smoothest side of a matte / matte polypropylene film 3.0 mil (75 microns) thick (prepared from the resin polypropylene # 5A95 available from Shell Chemical Co.). The PSA composition was 49.5% by weight of Kraton ™ 1119 (a styrene-isoprene-styrene block copolymer available from Shell Chemical Co.), 49.5% by weight of Wingtack ™ Plus (a solid C5 adhesive resin available from Goodyear Chemical Co.), and 1.0% by weight of IrganoxM 1076 (a hindered phenol antioxidant available from Ciba-Geigy). The PSA was coated with a 50% solution of solids in a solvent mixture of toluene: heptane 77:23. The coating thickness of the final PSA was 7 grains / 24 in2 (29 microns). The adhesion to the cut (PSA to film substrate) was measured by determining the period of time it takes a sample of 1 inch x 0.25 inches (2.5 cm x 0.63 cm) from the "" "adhesive tape when peeling off the smooth side of a 4.0 mil (100 micron) thick molded polypropylene film that has a matte finish on one side (prepared from resin # 7C50), a propylene ethylene impact copolymer available from Shell Chemical Co.) under a one kilogram load. A 1 inch x 2 inch (2.5 cm x 5.1 cm) area of the PSA tape was placed with the adhesive facing down on the smooth side of the 2 inch x 6 inch (5.1 cm x 15.2 cm) piece of the film. polypropylene and pressed onto the film using two passes of a 4.5 lb. (2 kg) hard rubber roller. The area superimposed between the tape and the film was 1 inch x 0.25 inches (2.5 cm x 0.63 cm). The PSA film / tape sheet was then suspended vertically in an oven at 40 ° C for 15 minutes after which a weight of one (1) kilogram of the PSA tape was suspended creating a shear load at a 180 degree angle. The time it takes to fall weight was recorded as a measure of cutting or cutting adhesion. An average of five tests gave a value of cutting or cutting adhesion of >9900 minutes For comparison, the cutting or cutting adhesion of PSA to PSA was also measured by the procedure described above except that two pieces of PSA tape of 1 inch (2.5 cm) wide were laminated to each other (PSA to PSA) so that there was an overlap area of 1 inch x 0.25 inches (2.5 cm x 0.63 cm) between the two tapes. An average of five tests gave a cut-off or cut-off value of PSA to PSA of 236 minutes, which is considerably less than the value of the cutting or cutting adhesion of PSA to film substrate.

It is noted that in relation to this date, the best method known by the applicant to carry out the aforementioned invention, is the conventional one for the manufacture of the objects to which it relates. Having described the invention as above, property is claimed as contained in the following:

Claims (23)

1. A pressure-sensitive adhesive tape closure system, characterized in that it comprises a closure tape sheet comprised of a fastening tape tab portion having a substrate with a first and second faces and a tape tab portion of a tape. detachment having a substrate with a first and second faces, the first face of the substrate of the portion of The stripping tape tab has an adhesive layer without an adhesive layer on the second face, the first face of the fastening tape tab portion having a non-adhesive clamping surface on the second face, with two first faces of the tongue portions of 15 tape bonded together at the ends thereof by at least one adhesive layer bond to the substrate, so that the holding surface of the fastening tape tab portion and the adhesive layer of the tape tab portion of the tape detachment do not form a bond of adhesive to 20 adhesive and the first side of the fastening tape tab portion is in face-to-face contact with the second face of the release tape tab portion when the sheet is bent in the bonding region of the adhesive layer to the substrate . 25

2. The tape closure system according to claim 1, characterized in that the clamping surface of the fastening tape tongue portion comprises a mechanical fastening element.

3. The tape closure system according to claim 1, characterized in that the holding surface of the fastening tape tab portion comprises an adhesive layer and the second face of the release tape tab portion has a release surface. .

4. The tape closure system according to claim 3, characterized in that at least one attachment of the adhesive layer to the substrate is a direct bond between the adhesive layer of the fastening tape tab portion and the first side of the substrate of the adhesive. tab portion of release tape.

5. The tape closure system according to claim 3, characterized in that at least one bonding of the adhesive to the substrate is a direct bonding between the adhesive layer of the release tape tab portion and the first side of the substrate of the release portion. tongue of fastening tape.

6. The tape closure system according to claim 3, characterized in that at least one attachment of the adhesive layer to the substrate are two bonds of the adhesive to the substrate between the adhesive layer of the fastening tape tab portion and a first face of the adhesive. intermediate substrate and the adhesive layer of the release strip tab portion and the second side - of the intermediate substrate.

7. The tape closure system according to claim 3, characterized in that the release surface of the second face of the release strip tab portion is formed by means of a release liner.

8. The tape closure system according to claim 3, characterized in that the second face of the fastening tape tongue portion is provided with a release surface.

9. The tape closure system according to claim 4, characterized in that the release tape tab portion is provided with an adhesive-free region between the adhesive layer of the release tape tab portion and the layer bonding. ~ Adhesive to the substrate.

10. The tape closure system according to claim 9, characterized in that at least the adhesive-free region of the substrate is elastic.

11. The tape closure system according to claim 5, characterized in that at least the z? "Fastening tape tab portion is provided with an adhesive-free region between the adhesive layer of the fastening tape tab portion and the bonding of the adhesive layer to the substrate.

12. The tape closure system according to claim 3, characterized in that the adhesive layer of the fastening tape tab portion is less aggressive than the adhesive layer of the release tape tab portion.

13. A diaper fastening tape fastening system, comprising a fastening tape tab having a first face and a second face, the first face having a pressure sensitive adhesive layer of 25 an adhesive comprising from 0 to 40 parts of an adhesive elastic solvent and water insoluble solvent or microspheres "polymer dispersible in water and 100 to 60 parts of a latex acrylate adhesive, characterized in that it comprises: (a) at least about 70 percent alkyl acrylate monomer; (b) from 0 to 30 percent of a polar monomer; and (c) from 0 to 20 percent of a monomer having a Tg greater than that of the alkyl acrylate.

14. The fastening tape tab according to claim 13, characterized in that the latex adhesive alkyl acrylate monomer comprises a C2 to Ci4 alkyl acrylate of a monofunctionally unsaturated acrylate ester of a non-tertiary alkyl alcohol.

15. The fastening tape tab according to claim 13, characterized in that the alkyl acrylate of the latex adhesive comprises isooctyl acrylate, isononyl acrylate, 2-ethylhexyl acrylate, butyl acrylate or mixtures thereof.

16. The fastening tape tab according to claim 14, characterized in that the Tg monomer greater than the latex adhesive comprises a vinyl ester, an alkyl ester of Ci to C of acid 5 (meth) acrylic, styrene or mixtures thereof.

17. The fastening tape tab according to claim 14, characterized in that the polar monomer of latex adhesive comprises from 0 to 20 by L O hundred of the adhesive.

18. The fastening tape tab according to claim 13, characterized in that the latex adhesive further comprises: J 5 (d) from 0 to 20 percent of a low molecular weight hydrophobic polymer.

19. The disposable article according to claim 18, characterized in that the latex adhesive 20 further comprises: (e) from 1 to 10 percent of an ionic copolymerizable surfactant based on the components of the total adhesive ((a) to (d)).

20. The fastening tape tab according to claim 19, characterized in that the microspheres have an average diameter of 1 to 300 microns.

21. The fastening tape tab according to claim 20, characterized in that the microspheres comprise an acrylate polymer or copolymer having a glass transition temperature of less than about -10 ° C.

22. The fastening tape tab according to claim 21, characterized in that the adhesive microspheres comprise: (a) from 90 to 100 parts of the free radical polymerizable monomer; (b) from 0 to 10 parts of a polar monomer; and (c) from 0 to 10 parts of the hydrophilizing component.

23. The fastening tape tab according to claim 22, characterized in that the adhesive microspheres comprise from 90 to 99.9 parts of the free radically polymerizable monomer, 0.1 to 6 parts of polar monomer and 0 to 5 parts of the hydrophilizing component.