MXPA00011956A - Hot melt pressure sensitive adhesive composition - Google Patents

Abstract

The invention is an article comprising a hot melt PSA permanently adhered to at least one substrate wherein the adhesive has a shear adhesion failure temperature of greater than about 79°C (175°F). Preferably, the adhesive is pattern coated directly onto a polyolefin film for use in a variety of articles including adhesive bandages, tape and feminine napkins.

Description

ADHESIVE COMPOSITION SENSITIVE TO HOT FUSION PRESSURE DESCRIPTION OF THE INVENTION The invention relates to a hot melt pressure sensitive adhesive (HMPSA) composition that is useful for coating heat sensitive substrates and articles constructed thereof. In particular, the invention relates to a hot melt adhesive having certain rheological characteristics, indicative of a low softening point and a low melt viscosity in combination with high cohesive strength. These combinations of properties are particularly suitable for removing adhesive applications where the adhesive is permanently adhered to a substrate and is subsequently "removably" adhered to a surface such as cloth or skin without adhesive transfer. Due to the viscosity at low application temperatures, the adhesive composition is suitable for methods of hot melt adhesive applications where the coating device contacts the substrate that is coated such as in the case of screen printing and roll coating Recorded. The invention further relates to articles such as feminine pads, tapes, and bands wherein the novel HMPSA composition is coated on a substrate. The "removable" or "releasable" HMPSA are those in which the adhesive is permanently adhered to at least one substrate such as paper supply or a layer of polyolefin film and then removably attached to a surface in order to ensure an article for a period of time. Examples of items that use removable HMPSA include tapes, labels and adhesive tapes and adhesive strips. Female towels, adult incontinent pads as well as some hospital pads and bands also typically use removable HMPSAs commonly described as "binding to clothing" or "attaching" adhesives. During the manufacture of such articles, the HMPSA is typically tapered in a slot directly in a supply of paper or polyolefin film substrate and then coated with a release aligner. Alternatively, the adhesive can be transferred coated by first applying the adhesive to the release aligner and subsequently contacting the adhesive to the substrate layer, sandwiching the hot melt PSA between the substrate and the release paper. There are a multitude of patents belonging to adhesive compositions for tapes, labels, adhesive bands and the like. Alper et al., EP 525 251 Al, Collins et al., U.S. Patent 4,136,699 and Raykovitz et al. U.S. Patent 4,704,110 specifically relates to hot melt PSA placement adhesives for feminine pads. However, such patents are typically directed toward the continuous slot coating of the HMPSA. EPO Patent 794 202 A 1 published on October 9, 1997 is directed to aliphatic petroleum-based resins, a method for controlling the point of abalancing and molecular weight of such resin, and HMPSA containing such resins. The hot melt adhesive composition generally consists of polymers S-I-S containing 0 to 30 parts by weight of styrene. In recent years, manufacturers have attempted to replace the continuous slot coated method with various batch methods, such as pattern coating methods and engraved roller coating, referred to in other ways as screen printing. There are several advantages to using these types of discontinuous coating techniques that include aesthetic advantages due to the variety of designs as well as the ability to strategically place the adhesive in precise locations. Primary advantage methods such as engraved roll coating and pattern coating offer the ability to reduce enough adhesive consumption since the surface area per mass of adhesive is greatly increased. NeverthelessThis increase in surface area in combination with the adhesive applied to small individual tanks rather than a continuous layer creates issues of adhesive transfer, particularly when the coated substrate is a polyolefin film. It is theorized that in order for the adhesive to have a balanced balance of properties, the adhesion to the substrate must be greater than the cohesive strength of the hot melt PSA. Concurrently, the cohesive strength of the adhesive must be greater than the adhesion to the surface to which the adhesive is removably bonded. The • adhesives having these qualities in a slot coating application typically exhibit adhesive transfer when coated by engraved roll or coating by pattern, particularly at high rates of removal. Additionally, since it is preferred to directly apply the adhesive to the substrate for these methods of application to improve adhesion, HMPSA is needed • they are low in viscosity at low application temperatures in combination with the proper balance of adhesion and cohesion. It has been found in the present that certain pressure sensitive adhesive compositions fused in hot meet these requirements. In the present invention it has been discovered that easily measured rheological properties of the adhesive can be used to predict the success of a removable HMPSA for discontinuous coating at application temperatures. casualties. Although it is known from the Dahlquist criteria that Psa exhibits a storage modulus of less than about 5 x 106 dynes / cm 2, it has been discovered in the present that hot melt adhesive compositions which additionally exhibit a cross-over temperature of Less than 85 ° C, preferably less than about 80 ° C. Since the crossover temperature is indicative of the melting point, the adhesives of the present invention melt at a significantly lower temperature. Additionally, the G 'decreases below about 100 dynes / cm at a temperature of 10 ° C colder than the low viscosity removable HMPSA compositions which are slot coated for use as placement adhesives. Accordingly, the adhesive compositions of the present invention exhibit a G 'of less than 100 dynes / cm 2 at a temperature of less than 95 ° C and preferably at a temperature of about 90 ° C or less. At approximately 10 dynes / cm2 the adhesive composition is sufficiently melted in such a way that the storage module (G ') is difficult to measure. In addition, the adhesive composition is also characterized as having a glass transition temperature (Tg) of about 0 or more. Hence, the adhesive composition of the present invention has a relatively low melt viscosity at lower temperatures. Preferably, the Brookfield viscosity of the adhesive composition is less than about 5,000 to 125 ° C, and more preferably the viscosity is less than 5,000 cPs at 110 ° C. This combination of properties is particularly suitable for contacting coating of heat sensitive materials such as pattern coating and engraved roll coating which notches the adhesive as a plurality of individual adhesive deposits. It is believed that these rheological criteria are also suitable for other batch coating methods, such as spiral spray and hot melt blow molten application methods. In another embodiment, the present invention is a disposable article, such as a feminine towel or an adhesive tape, comprising an HMPSA permanently adhered to at least one substrate wherein the adhesive has a crossover temperature of less than 85 ° C, preferably about 80 ° C or less. The adhesive can subsequently be adhered in removable form to a surface such as cloth or skin. Preferably, the substrate is a layer, of polyolefin film. The adhesive composition comprises at least one block copolymer having a styrene content of at least about 25% with respect to the total weight of the block copolymer, at least one aromatic tackifying resin, and at least one diluent liquid. Preferably, the adhesive comprises from about 10% by weight to about 30% by weight in the adhesive of a styrene-isoprene-styrene (EIE) or styrene-butadiene-styrene (EBE) block copolymer, of about 40% by weight to about 65% by weight of at least one aromatic aliphatic tackifying resin; and from about 15% by weight to about 35% by weight of a plasticizer. BRIEF DESCRIPTION OF THE DRAWINGS Figure 1 represents a temperature sweep of Example 1 (tables), an adhesive composition of the present invention as well as Comparative Example A (diamonds). The storage module (G ') is represented by solid frames and diamonds, while the loss module (G') is represented by the unfilled squares and diamonds. Both compositions exhibit a storage plate module in the range of about 20 ° C to about 60 ° C of less than about 5 x 106 dynes / cm2, indicative of a pressure sensitive adhesive. The crossing temperature is the highest temperature at which G 'and G "intersect. In the case of Comparative Example A, the crossing point occurs at about 85 ° C, while the adhesives of the present invention exhibit a cross at a temperature of about 75 ° C. The present invention is a hot melt adhesive composition, a method for using such an adhesive particularly for discontinuous contact coating and articles comprising a removable HMPSA permanently adhered to at least one substrate. The crossing temperature of less than 85 ° C and more preferably about 80 ° C or less in combination with the storage modulus is in the range of about 5 x 104 dynes / cm2 to about 5 x 106 dynes / cm2 and preferably about 1 x 105 dynes / cm2 at approximately 5 x 106 dynes / cm2. For the adhesives of the present invention, the crossing temperature is as low as possible without sacrificing the storage module plate below the target range. Additionally, the G 'decreases below about 100 dynes / cm2 at a temperature of 10 ° C colder than the low viscosity removable PSA compositions which are slotted to use as a placement adhesive. Accordingly, the adhesive compositions of the present invention exhibit a G 'of less than 100 dynes / cm 2 at a temperature of less than 95 ° C and preferably at a temperature of about 90 ° C or less. In addition, the adhesive composition of the present invention typically has a glass transition temperature (Tg) of about 0 ° C or more. Applicants have found that these readily discernible and readily measured measurements of a hot melt adhesive composition are predicted as soon as a discontinuous coating of the adhesive is transferred after removal. The removable pressure sensitive adhesive comprises at least one thermoplastic polymer present in an amount in the range of about 10% by weight to about 50% by weight, preferably from about 10% by weight to about 40% by weight, more preferably from about 10% by weight to about 30% by weight, and more preferably from about 10% by weight to about 20% by weight. In very high concentrations, typically in excess of about 25% by weight, the adhesive composition tends to exhibit very high viscosity to be applied at low application temperatures, while at polymer concentrations less than about 10% by weight, the adhesive lacks sufficient cohesive resistance For polymers having a relatively high molecular weight, wherein the melt index is less than about 10 g / 10 minutes, lower concentrations of polymer generally provide sufficient cohesive strength, while higher polymer concentrations are necessary when polymers of lower molecular weight. Preferably, the polymer is a block copolymer A-B-A; wherein block A is a polystyrene and block B is isoprene, butadiene, ethylene-butylene, ethylene-propylene or mixtures thereof. Preferably, the block copolymer has a styrene content greater than about 25% styrene, since the styrene content has an increased effect on the cohesive strength and reduces the transfer tendencies. Block copolymers of lower styrene content are also useful, particularly when mixed with at least one concentrated styrene block copolymer, more than about 25% styrene, or when used in combination with a final block of styrene. High softening that reinforces the tackifying resins. The block copolymer may be linear or preferably radial in structure to minimize the viscosity at application temperature. Particularly for engraved roll coating applications, the adhesive composition comprises a block copolymer having an unsaturated middle block such as styrene-isoprene-styrene block copolymer (EIE) or styrene-butadiene-styrene (EBE), the EIE which is more preferred. Preferably the styrene content of the block copolymer is at least 25%, preferably about 30% or more, and more preferably about 40% or more. The block copolymer preferably has a melt index (MI, Condition G) in the range of about 10 g / 10 min to about 60 g / 10 min and more preferably about 20 g / 10 min. at approximately 40 g / 10 min. Block copolymers having a styrene content of less than about 25% or an MI greater than 60 g / 10 min; it lacks disadvantageously enough cohesive strength causing adhesive transfer when soybeans are used. However, such a polymer can be employed if it is mixed with another polymer in such a way that the melt index and / or styrene content of the mixture is within the desired range. Other polymers which may be suitable alone as a base polymer or in combination with the block copolymer for HMPSA include commercially available amorphous polyolefins from Huís and Rexene under the Vestoplast® and Rextac® and metallocene and single site commercially available catalyzed polyolefins of Exxon under the brand Exact®, and Do / Dupont under the brands AffinityMR and InsiteMR. The metallocene catalyst results in linear or substantially linear homogeneous interpolymers of ethylene with at least one alpha olefin where the polydispersity is less than about 2.5. Other polymers useful for formulating HMPSA include polyesters particularly water-dispersible copolyesters from Eastman Chemical such as AQ 1045 and AQ 1350 as well as hot melt moisture cures and polyurethanes. The adhesive of the invention comprises a tackifying resin. The tackifying resins are in the range of being a liquid at 37 ° C to have a ring and ball softening point of about 135 ° C. Solid tackifying resins are present in amounts up to about 65% by weight. However, if the liquid tackifiers are employed, the concentration of the tackifier can exceed 65% by weight. Preferably, the tackifying resin is present in an amount in the range from about 20% to about 65% by weight, more preferably from about 40% to 65% by weight. In very high resin concentration, the adhesive is very rigid exhibiting seals or flake properties of the glue strip type, while in very low resin concentration, poor processing characteristics such as occur in angle hairs. The tackifying resins useful in the present invention comprise resins derived from renewable sources such as rosin derivatives including rosin, tallow oil, gum rosin; rosin esters, natural and synthetic terpenes and derivatives thereof. The tackifiers based on aliphatic aromatic mixed or aromatic aliphatic oils are all useful in the adhesive of this invention. Representative examples of useful hydrocarbon resins include styrene alpha methyl resins, branched and unbranched C5 resins, Cg resins, Cio resins, as well as styrenic and hydrogenated modifications thereof. By employing certain tackifying resins, the slope of the storage module (G ') at higher temperatures of the storage module plate can be increased at lower temperatures without sacrificing the storage module plate. To acquire this property, preferably the tackifying resin comprises a mixture of aliphatic and aromatic constituents. The aromatic content is preferably at least about 10% by weight relative to the weight of the resin and preferably at least about 15% by weight as measured by the content of NMR protons. Further, in embodiments wherein the tackifier resin blends are employed at least 405, preferably 50%, and more preferably 70% or more of the total resin concentration is an aromatic resin having at least about 15% aromaticity . Representative examples include MBG-275, a 100 ° C softening point hydrogenated C9 resin available from Hercules and Escorez 560, an aromatically modified dicyclopentadiene resin available from Exxon (Houston, TX). The aromaticity allows such resin to soften the styrenic terminal block which consequently reduces the melting point of the adhesive and flattens the viscosity curve. Alternatively, a predominantly aliphatic tackifying resin can be combined with a tackifying resin that is aromatic in character. Commercially available predominantly aliphatic tackifying resins suitable for use in the present invention include Arkon P 90, Arkon P 125, Arkon P 140, fully saturated alicyclic hydrocarbon resins from Arakawa Chemicals Industries Ltd; ESCOREZ 5300, ESCOREZ 5320, ESCOREZ 5340 and ESCOREZ 5380, dicyclopentadiene resins from Exxon Chemical Company; as well as less hydrogenated versions such as the ESCOREZ 5400 series and resins of the Hercules REGALITE type. Useful aromatic resins are available Hercules Inc. under the Kristalex® brand and typically have a softening point greater than about 100 ° C, more preferably the softening point is in the range of about 120 ° C to about 160 ° C. Polyphenylene oxide (PPO) is another useful final block reinforcing resin. Samples of Ppo-containing products premixed with either a tackifier or a block copolymer are available from Arziona and shell Chemical. A minimum amount of flowability ingredient is required for the present invention. Such an ingredient of fluidity can be provided as a plasticizer, a liquid resin, a liquid elastomer or any other material which flows at ambient temperatures. It is a widely useful plasticizer and can be defined as a typically organic composition that can be added to thermoplastics, rubbers and other resins to improve extrudability, flexibility, working or drawing capacity. Preferably the plating agent is a liquid at room temperature, such as hydrocarbon oils, polybutene, liquid tackifying resins, liquid elastomers, and is present in amounts up to ^ approximately 50% by weight. More preferably, the plasticizer is an oil present in an amount in the range of about 10% by weight to about 50% by weight and more preferably about 15% by weight about 35% by weight. Such oils are mainly hydrocarbon oils, low in aromatic content and are paraffinic or naphthenic in character. The oils are preferably low in volatility, transparent and have as little color and smell as possible. The plasticizers useful in this invention also include the use of olefin oligomers, low molecular weight polymers, vegetable oils and their derivatives and similar plasticizing liquids. As is known in the art, several others components can be added to modify the tack, color, odor, etc., of a hot melt adhesive. In particular, it has now been found that a small concentration of wax from about 1% by weight to about 5% by weight can be used to increase the cohesive strength and / or reduce peeling. It is generally preferred that the other components or ingredients should be relatively inert and have negligible effects on the properties contributed by the block copolymer, plasticizer agent and plasticizer. Antioxidants and other stabilizing ingredients are also typically added to protect the adhesive from various as heat and light induced degradation. The present invention is particularly useful for engraved roll coating and pattern coating. The pattern coating involves extruding a hot melt adhesive through a rotating screen which in turn deposits the adhesive directly on the substrate to be coated. Alternatively, the screen may deposit the adhesive first on release paper and then coat the transfer to the adhesive on the proposed substrate. The screens typically used in this process in the range of about 15 mesh to about 195 mesh, preferably about 30 to 60 mesh, more preferably about 30 to 40 mesh. The 30 to 60 mesh screen results in deposits of molten adhesives in hot individual in the mass range of as little as approximately 5 x 10-5 grams per adhesive deposit at approximately 0.05 grams per adhesive deposit.

In the case of engraved roll applications, the adhesive is provided in a molten form in a reservoir. A roller which has been engraved with depressions is placed in such a manner as the roller reverses, a roller portion in contact with the melted adhesive. Excess melted adhesive which is not present within the depressions typically spread on the roll. The roller is then subsequently contacted to a substrate, deposit the adhesive which is inside the depressions recorded in the substrate. The temperature of the roller can be controlled by a heating and / or cooling medium. In any event the roll typically reaches the temperature of the melted adhesive in the range of about 90 ° C to about 180 ° C. For heat sensitive substrate such as low bore polyolefin films preferably the roll temperature does not exceed about 160 ° C, more preferably the roll is maintained at a temperature of about 140 ° C or less and more preferably at a temperature in the range from about 90 ° C to about 125 ° C. After coating by any of these methods, the number of individual hot melt adhesive deposits per substrate area is in the range of as little as 1 per square inch to as much as approximately 600 square inches. The total mass of adhesive per area is in the range of as little as about 5 g / m2 to about 50 g / m2 and preferably about 12-25 g / m2. Amounts greater than about 50 g / m2 exceed the coating weight currently used for most coating applications. However, higher amounts may be useful for some applications that require very aggressive adhesion. Preferably, the adhesive is coated directly on the substrate. When this technique is employed in the case of pattern coating, the individual adhesive deposits are pyramidal in shape with a substantially square shaped base adhered to the substrate. All four faces of the pyramid shaped adhesive deposit can then be removably adhered to another surface, particularly when the bonding surface is deformable to some degree such as skin or fabric. The transfer coating may also be suitable. However, the transfer coating results in the tips of the pyramids that adhere to the substrate with the base of the pyramids facing outwards. This configuration is less desirable, particularly when the majority of the heat has dissipated over time the adhesive is transferred to the substrate. In the case of engraved roll coating, the formation of the adhesive deposit corresponds to the engraving or photo-engraved depressions in the coating roll surface. Therefore, the shape of adhesive deposits vary from scratched patterns, company logos and stamps for points and boxes in various layouts. The present invention is not limited to any particular form of individual adhesive deposits. Already - ^ a? that the screens are typically manufactured having holes in the form of tiles in the case of pattern coating, the resulting adhesive deposit is a four-sided pyramid having a frame base. However, triangular, circular, elliptical, etc. holes are also contemplated. The hemispherical adhesive deposits are anticipated to be preferred. In order that the hot melt adhesive is suitable for direct coating on heat sensitive polyolefin films, the HMPSA must have a low viscosity at a temperature of less than about 300 ° F (148.8 ° C), more preferably less than about 275 ° F (135 ° C), more preferably less than about 250 ° F (121 ° C). The viscosity of the HMPSA at the application temperature is typically less than about 15,000 cps at 275 ° F, preferably less than about 5,000 cps.

It is desired that the melt viscosity be as low as possible without reducing the storage modulus below the target range. Therefore, more preferably the viscosity of the adhesives is less than about 2,000 cPs, even more preferably less than about ,000 cPs, and more preferably approximately 500 cPs. Adhesives having a Brookfield viscosity of more than about 15,000 cps at the application temperature are very viscous to be coated, particularly when the adhesive deposit is less than about 40 mesh. At temperatures above 275 ° F (135 ° C) ), movies about • Polyolefin typically exhibit heat induced distortion. As mentioned previously, discontinuous coating methods such as spray, etched roller and pattern coating are particularly preferred over a groove coating due to the ability to greatly increase the surface area per mass of adhesive. This increase in surface area provides sufficient adhesion, comparable to adhesion levels of slot coating applications at less large adhesive consumption levels. The pattern coating offers other disadvantages such as the ability to strategically place small amounts of adhesive in precise locations. This aspect is particularly important for applying water sensitive adhesives to ^ Disposable absorbent articles such as diapers disposable, feminine towels to improve fluid acquisition or to adhere super absorbent polymers. Additionally, the dimensional aspect of the individual adhesive deposits is proposed to improve shear properties. Additionally, since the coating of engraved roll and hot melt adhesive pattern coating is similar to screen printing clothes, these types of coating methods are capable of creating aesthetic disadvantages since a variety of designs such as brands and logos of companies are possible. However, these disadvantages can be realized by removable HMPSA if the adhesive remains permanently adhered to the substrate during use and is not transferred on the surface from which it is proposed to be removed. Although the etched roll coating and pattern coating is exemplified, the adhesive composition of the present invention is expected to be useful for any removable HMPSA method, particularly discontinuous coating methods, since the inherent problem is essentially the same. The HMPSA adhesive useful in the present invention is not necessarily limited to any particular kind of adhesives. However, the adhesive must possess a sufficiently low viscosity at the application temperature to ensure ease of processing. This aspect is of particular importance to direct coating of heat sensitive polyolefin films. More preferably, the adhesive exhibits no tendency for plasticizer staining If the concentration of the plasticizer exceeds the binding power of the polymer, the plasticizer tends to migrate to the surface under pressure and high temperature. This migration of plasticizer causes problems with adhesive transfer and residual transfer. The adhesive composition is particularly useful for a variety of "removable" or "releasable" adhesive applications. For such embodiments, the novel HMPSA composition permanently adhered to at least one substrate such as paper, film, sheet, or laminate supply and then removably attached to a surface in order to secure an article for a period of time. Examples of items that use removable HMPSA include adhesive tapes, labels, and adhesive strips. Female towels, adult incontinence pads as well as some hospital pads and bandages also typically use removable HMPSA commonly described as "clothing binding" or "placement" adhesives to secure the article to the fabric. In the case of disposable absorbent articles such as feminine towels, the positioning adhesive is typically coated to a substrate impermeable to body fluid such as a film. An absorbent material is attached directly or indirectly to the impermeable body fluid substrate on the opposite side as the placement adhesive. The absorbent is also typically covered or surrounded by a cover permeable to body fluid. Alternatively, the positioning adhesive can serve as a dual function and also serves as the barrier impervious to body fluid. During the manufacture of such articles, the HMPSA is typically slot coated directly on a paper or polyolefin film substrate stock and then coated with a release aligner. Alternatively, the adhesive can be transfer coated by first applying the adhesive to the aligner and subsequently contacting the adhesive to the substrate layer, sandwiching the hot melt PSA between the substrate and the release paper. Advantageously, the adhesive compositions of the present invention are low in viscosity at low application temperatures and thus are well suited for methods in which the hot melt adhesive applicator is contacted to a heat sensitive substrate. These properties are particularly suitable for engraved roll coating and pattern coating. The adhesive can be coated at relatively low temperatures in the range of about 90 ° C to about 140 ° C and preferably from about 90 ° C to about 125 ° C. The present invention can also be exemplified by the following non-limiting examples. Examples 1-3 are made in a sigma blade mixer using known hot melt adhesive mixing techniques. In addition to the physical properties measured for each of the compositions, the adhesives are roll coated onto a polyolefin film in coating weights in the range of about 15 to about 30 g / m2. The depressions of the engraved roll coating are in the range of 40-500 microns. The adhesion of the shell of the coated engraved roll samples is also tested and found to not transfer adhesive to the fabric. Test Methods 1. Brookfield Viscosity is determined with Brookfield models DVH, DV-II or DV-III. An appropriate rod size and sample size of hot melt adhesive is selected according to the instructions of the viscometer manufacturers. The adhesive sample is melted in the thermocell at the temperature at which the viscosity is measured. The rod is diminished in the sample of molten adhesive. The motor is activated at a lower speed and the corresponding torque reading is displayed. The speed is increased until the torque reading stabilizes and the viscosity measurement is recorded after 20 minutes. 2. The ring and ball softening point is determined with a Herzog MC 753 instrument. The rings are preheated to the melting temperature and then placed on the release paper. The sample of molten adhesive is then emptied into the rings without the inclusion of air bubbles. After enfiracy, the excess adhesive is removed from the rings and two samples are placed in the appliance holder with steel balls on top of each sample. Samples are decreased in a beaker filled with glycerin placed on a heating plate. Samples are decreased in glycerin and heated at a rate of 5 ° C per minute. The average temperature at which the balls fall is recorded, the difference is not more than 1 ° C. 3. The needle penetration is measured according to DIN 51579 with a load of 100 g and a speed of 5 seconds. 4. Determine the T shells for a textile material by first preparing hot melt coated adhesive films in a Mylar film or polyolefin using a slot coating device at an appropriate application temperature. During the preparation of the adhesive film, the adhesive surface is coated with release paper for ease of handling. The target coating weight is checked at the indicated coating weight or 40 g / m2 +/- 3 g / m2 where nothing else is indicated. The adhesive coated films are cut into strips 25 mm wide which are 170 mm in length in the machine direction. Remove the release paper and the adhesive surface from one of the strips placed on the textile test cloth *. The sample is placed in a mechanical descending roller device (2250 g at 120 inches / min), and it is allowed to pass the roller twice over the sample, one forward and one back. The strips are cut in the middle to obtain two samples. The strip is placed in the movable jaw and the fabric is placed in the stationary jaw. The procedure is repeated three times (six samples), recording the average T shell value and noting any stretching or transference. T shell values are reported in grams per linear inch. It is preferred to have shells T in the range of 100-500 grams, more preferred in the range of 200-500 grams without adhesive transfer. Test fabrics * from TestFabrics (style 460.30 cotton interwoven fabric pre-washed at 95 ° C, style 322 nylon tricot 6 prewashed at 40 ° C, and satin reference 010682 prewash at 40 ° C). the prewash is done without detergent. 5. For the test of time, temperature, pressure the same procedure is followed as the "initial dehulling" with the exception that after the adhesive coated surface is put in contact with the test cloth, it is conditioned in an oven. 38 ° C for 15 hours under a pressure of 0.8 g / m2 and then conditioned at room temperature before being peeled. 6. Rheological measurements that include the loss modulus, G '', the storage modulus, G ', at 25 ° C and the Tg are determined using a Bohlin controlled voltage rheometer with an objective value of 0.01. The parallel plates used have a diameter of 20 mm and a space of 1.5 mm. The instrument is set at a frequency of 1 hertz and a temperature sweep is performed for the desired temperature range at a temperature increase of 0.2 ° C for 6 seconds or other parameters in accordance with ASTM D4440-93. EXAMPLE 1 Ring and ball softening point 77 ° C Needle penetration at 25 ° C 87 1/10 mm Viscosity at 125 ° C 1145 mPa.s Vitrea transition temperature (Tg) 7 ° C EXAMPLE 2 Ring and ball softening point 79 ° C Needle penetration at 25 ° 64 1/10 mm Viscosity at 125 ° C 853 mPa. s Vitrea transition temperature -1.1 ° C Initial shell strength (N / 25 mm) Cotton 2.3 + 0.1 Nylon 3.1 + 0.3 Polyester 2.4 + 0.2 Time, temperature, pressure Cotton 3.7 + 0.1 Nylon 5.7 + 0.3 Polyester 5.6 + 0.3 EXAMPLE 3 Ring and ball softening point 73 ° C Needle penetration at 25 ° 64 1/10 mm Viscosity at 125 ° C 1318 mPa. s Vitrea transition temperature -3.3 ° C Initial shell resistance (N / 25 mm) Cotton 2.1 + 0.1 Nylon 2.4 + 0.2 Polyester 2.2 + 0.1 Time, temperature, pressure Cotton 4.1 + 0.5 Nylon 6.2 + 0.4 Polyester 5.8 + 0.3

Claims (10)

1. CLAIMS 1. An article characterized in that it comprises a hot melt pressure sensitive adhesive adhered • permanently to at least one substrate where the The adhesive has a crossover temperature of less than about 80 ° C at a frequency of 1 hertz.
2. 2. The article according to claim 1, characterized in that the adhesive has a G 'of less than about 100 dynes / cm2 in a 10 temperature of less than about 90 ° C. • The article according to claim 1 or 2, characterized in that the adhesive has a Tg of about 0 or more. 4. The article according to claim 1 or 2, characterized in that the substrate is a polyolefin film. 5. The article according to any of claims 1-4, characterized in that the article is ^^ a female towel. 6. The article according to any of claims 1-4, characterized in that the article is an adhesive tape. 7. The article according to any of claims 1-4, characterized in that the adhesive is 25 removably attached to a second substrate. 8. The article according to claims 1-7, characterized in that the adhesive is present as a plurality of individual adhesive deposits. 9. A composition of adhesive sensitive to • hot melt pressure characterized in that it comprises: a) from about 10% by weight to about 30% by weight of at least one of the block copolymer A-B-A. b) from about 20% by weight to about 65% by weight of a tackifying resin; and 10 c) from about 15% by weight to about 35% • by weight of a plasticizing oil. wherein the adhesive has a crossover temperature of less than about 80 ° C. 10. The adhesive composition according to claim 9, characterized in that the adhesive has a G 'of less than about 100 dynes / cm2 at a temperature of less than about 90 ° C. •