WO2025181728A1 - Differential adhesive enabling platinum silicone release liners for silicone-based adhesives - Google Patents

Abstract

The present invention is a layered adhesive including a rubber layer and a blend layer. The blend layer includes a rubber-based adhesive composition and a silicone-based adhesive composition.

Description

DIFFERENTIAL ADHESIVE ENABLING PLATINUM SILICONE RELEASE LINERS FOR SILICONE-BASED ADHESIVES Technical Field The present invention is related generally to the field of adhesives. In particular, the present invention is related to a multi-layered differential adhesive. Background Silicone-based pressure-sensitive adhesive compositions are very versatile because they tend to exhibit good adhesion to a variety of substrates including glass, ceramic, vinyl siding, finished wood, and painted drywall under challenging environmental conditions, including extreme temperatures and humidity. Many silicone-based pressure-sensitive adhesive compositions are coated onto a release liner as a wet composition, dried, and wound up into a roll. Providing the silicone-based pressure-sensitive adhesive on a release liner facilitates further processing of the adhesive including, e.g., transfer laminating, converting, and packaging. Release liners provide a variety of functions for pressure-sensitive adhesive compositions including, for example, preventing contamination of the adhesive layer, facilitating handling of the adhesive or an adhesive-coated article (e.g., by providing support thereto as well as covering the adhesive), identifying articles on which the release liner is disposed, and combinations thereof. A release liner is often left in place on a pressure-sensitive adhesive composition until the adhesive layer is converted, packaged, or shipped to ultimate users, and in many instances the release liner is left in place until the adhesive is adhered to another substrate. As a result, a pressure-sensitive adhesive coated release liner may potentially experience a variety of environmental conditions, including changes in temperature and humidity, and must be functional over extended periods of time. The strength of the adhesive bond formed between a silicone-based pressure- sensitive adhesive composition and a release liner tends to increase over time and upon exposure to elevated temperatures. This phenomenon is referred to as “adhesion build.” If the strength of the bond between the adhesive composition and the release liner is too great, the release liner and the adhesive composition cannot be separated from each other or can be separated only with difficulty, rendering the adhesive unsuitable for its intended purpose or frustrating the user. For articles that include silicone-based pressure-sensitive adhesive compositions, an undesirable degree of adhesion build often occurs before the end of the useful life of the article, thereby effectively decreasing the useful life of the article. Pressure-sensitive adhesive articles that are removable from a substrate through stretching are often referred to as stretch releasing pressure-sensitive adhesive articles. A number of backed and un-backed stretch releasing pressure-sensitive adhesive articles are described in literature and in patents. U.S. Pat. No.4,024,312 (Korpman), for example, discloses a highly conformable adhesive article that includes a highly extensible and elastic backing film laminated with an adhesive layer. The adhesive article is easily stretchable and may be removed from a surface by stretching the article lengthwise in a direction substantially parallel to the surface. German Patent No.3331016 discloses a high elasticity, low plasticity adhesive film based on a thermoplastic rubber and tackifying resins in which the adhesive bond can be broken by stretching the adhesive film in the direction of the plane of the adhesive bond. U.S. Pat. No.5,516,581 (Kreckel et al.) discloses a removable adhesive article having a highly extensible and substantially inelastic backing coated with a layer of pressure-sensitive adhesive and a non-adhesive pull tab to facilitate stretch removal. The adhesive article can be removed from most surfaces without damaging the substrate by grasping the non-adhesive pull tab and stretching the article in a direction substantially parallel to the surface of the substrate. U.S. Pat. No.6,231,962 (Bries et al.) discloses a removable foam adhesive strip that includes a backing that includes a layer of polymeric foam and a pressure-sensitive adhesive layer coated on at least one surface of the backing. A commercially available stretch releasing adhesive article is sold under the trade designation COMMAND by 3M Company, St. Paul, Minn. The revolutionary Command® Adhesive Strip products are a line of stretch removable adhesive strips that hold strongly on a variety of surfaces (including paint, wood, and tile) and that remove cleanly – no holes, marks, or sticky residue. These products generally have utility in bonding to various surfaces or substrates for numerous applications. In general, these products include a stretch release adhesive composition disposed on tape or other backings. Stretch releasable adhesives are high performance pressure- sensitive adhesives that combine strong holding power with clean removal and no surface damage. Stretch releasable adhesive products are designed to firmly adhere an article, such as a hook (to hold a picture or an article of clothing) or other decorative or utilitarian element, to a surface (an adherend), yet remove cleanly when pulled away from the architectural surface at a low angle. The clean removal aspect means that a tacky and/or unsightly residue is not left behind on the surface after removal of the stretch release adhesive and that no damage to the surface occurs during the removal process. During the process of stretch release removal, the adhesive layer typically remains adhered to the tape backing as the backing is stretched, but releases from the surface (adherend). Summary In one embodiment, the present invention is a layered adhesive including a rubber layer and a blend layer comprising a rubber-based adhesive composition and a silicone- based adhesive composition. In another embodiment, the present invention is a multi-layered differential adhesive including a rubber layer and a blend layer. The blend layer includes a urea-based silicone polymer and rubber. In yet another embodiment, the present invention is an adhesive assembly including a silicone release liner and a multi-layered differential adhesive. The silicone release liner includes a tight side and an easy side. The multi-layered adhesive includes a rubber layer and a blend layer. The blend layer includes a rubber-based adhesive composition and a silicone-based adhesive composition. When the material is in a rolled configuration, the tight side is between the silicone release liner and the blend layer and the easy side is between the silicone release liner and the rubber layer. The tight side and the easy side of the silicone release liner have a differential ratio of at least about 1.5:1. Brief Description of the Drawings FIG.1 is a side view of an adhesive assembly including a multi-layered differential adhesive of the present invention. FIG.2 is a side view of the adhesive assembly of FIG.1 wound up on itself in the form of a roll. FIG.3 is a side view of an embodiment of the adhesive assembly of FIG.1 that includes a backing. While the above-identified figures set forth several embodiments of the disclosure, other embodiments are also contemplated, as noted in the description. In all cases, this disclosure presents the invention by way of representation and not limitation. It should be understood that numerous other modifications and embodiments can be devised by those skilled in the art, which fall within the scope and spirit of the principles of the invention. Detailed Description The present invention is a multi-layered differential adhesive 10 that balances adhesion and liner release, particularly after aging. FIG.1 shows a side view of the multi- layered differential adhesive 10 as part of an adhesive assembly 100. The multi-layered differential adhesive 10 generally includes a rubber layer 12 and a blend layer 14 (the blend layer is also referred to as a blended layer). The blend layer 14 generally includes a rubber-based adhesive composition and a silicone-based adhesive composition. When used as a part of an adhesive assembly 100, the multi-layered differential adhesive 10 is disposed on a release liner 16 such that the blend layer 14 is positioned adjacent the release liner 16. Through the use of multiple layers, the multi-layered differential adhesive 10 disposed on the release liner 16 can exhibit an adhesion build to the release liner 16 that is sufficiently small such that the release liner 16 can be easily removed from the multi-layered differential adhesive 10 even after the adhesive assembly 100 has been stored for an extended period of time at ambient, or even elevated, temperatures. In some embodiments, the adhesive assembly 100 can be wound up on itself in the form of a roll 110 (as shown in FIG.2). The exterior most layer cleanly releases from the release liner 16 upon unwinding even after storage for an extended period of time at ambient, or even elevated, temperatures. The multi-layered differential adhesive 10, or layered adhesive, generally includes a rubber layer 12 and a blend layer 14. The rubber layer 12 includes a rubber component and optionally other components including, e.g., tackifying agents, plasticizers, antioxidants, fillers, pigments, light stabilizers (e.g., ultraviolet (“UV”) stabilizers), antiozonants, curing agents, metal deactivators, and combinations thereof. The composition of the rubber layer can be a pressure-sensitive adhesive composition or non pressure-sensitive adhesive composition. Useful rubber layers for the present invention exhibit an elastic recovery of at least about 70%, at least about 80%, at least about 90% or even about 100% as measured according to ASTM D5459-95 entitled, “Standard Test Method for Machine Direction Elastic Recovery and Permanent Deformation and Stress Retention of Stretch Wrap Film.” Suitable rubbers for the composition of the rubber layer 12 include, e.g., tacky and non-tacky elastomers based on natural rubber, nitrile rubber, butyl rubber, polysulfide rubber, and ethylene-propylene diene rubber (i.e., EPDM rubber). Particularly suitable are synthetic rubber adhesives including one or more styrenic block copolymers, each of which may have a linear, branched or radial structure. Mixtures or blends of any of these polymers can also be used. In addition to the rubber component, the rubber layer composition may also contain a tackifier. Suitable examples of the tackifier include, but are not limited to: rosin resin, rosin ester resin, hydrogenated rosin ester resin, terpene resin, terpene phenol resin, hydrogenated terpene resin, petroleum resin, hydrogenated petroleum resin, chroman resin, styrene resin, modified styrene resin, xylene resin and epoxy resin. Suitable tackified rubbers for this invention include, for example: natural rubber; olefins; silicones; synthetic rubber adhesives such as polyisoprene, polybutadiene, and styrene-isoprene- styrene, styrene-ethylene-butylene-styrene and styrene-butadiene-styrene block copolymers, and other synthetic elastomers; and tackified or untackified acrylic adhesives such as copolymers of isooctylacrylate and acrylic acid, which can be polymerized by radiation, solution, suspension, or emulsion techniques. The blend layer 14 generally includes a rubber-based adhesive composition and a silicone-based adhesive composition. The ratio of the rubber-based adhesive composition to the silicone-based adhesive composition balances the holding power and the liner release of the multi-layered differential adhesive. In one embodiment, the blend layer 14 includes between about 30% to about 80% of the rubber-based adhesive composition by weight, particularly between about 58% to about 70% of the rubber-based adhesive composition by weight, and more particularly between about 60% to about 64% of the rubber-based adhesive composition by weight. If the amount of rubber-based adhesive composition in the blend layer 14 is too low, the holding power of the layered adhesive 10 to another substrate or article, such as a release liner, may be too high and not allow separation of the release liner from the layered adhesive 10. If the amount of rubber-based adhesive composition in the blend layer is too high, the holding power of the layered adhesive to another substrate, such as a release liner, may be too low, allowing premature separation of the substrate and the layered adhesive. The rubber-based adhesive composition of the blend layer 14 includes a rubber component and optionally other components including, e.g., tackifying agents, plasticizers, antioxidants, fillers, pigments, light stabilizers (e.g., ultraviolet (“UV”) stabilizers), antiozonants, curing agents, metal deactivators, and combinations thereof. The composition of the rubber-based adhesive composition can be a pressure-sensitive adhesive composition or non pressure-sensitive adhesive composition. Useful rubber- based adhesive composition for the present invention exhibit an elastic recovery of at least about 70%, at least about 80%, at least about 90% or even about 100% as measured according to ASTM D5459-95 entitled, “Standard Test Method for Machine Direction Elastic Recovery and Permanent Deformation and Stress Retention of Stretch Wrap Film.” Suitable rubbers for the composition of the rubber-based adhesive composition include, e.g., tacky and non-tacky elastomers based on natural rubber, nitrile rubber, butyl rubber, polysulfide rubber, and ethylene-propylene diene rubber (i.e., EPDM rubber). Particularly suitable are synthetic rubber adhesives including one or more styrenic block copolymers, each of which may have a linear, branched or radial structure. Mixtures or blends of any of these polymers can also be used. In addition to the rubber component, the rubber-based adhesive composition may also contain a tackifier. Suitable examples of the tackifier include, but are not limited to: rosin resin, rosin ester resin, hydrogenated rosin ester resin, terpene resin, terpene phenol resin, hydrogenated terpene resin, petroleum resin, hydrogenated petroleum resin, chroman resin, styrene resin, modified styrene resin, xylene rein and epoxy resin. Suitable tackified rubbers for this invention include, for example: natural rubber; olefins; silicones; synthetic rubber adhesives such as polyisoprene, polybutadiene, and styrene-isoprene- styrene, styrene-ethylene-butylene-styrene and styrene-butadiene-styrene block copolymers, and other synthetic elastomers; and tackified or untackified acrylic adhesives such as copolymers of isooctylacrylate and acrylic acid, which can be polymerized by radiation, solution, suspension, or emulsion techniques. In one embodiment, the rubber in the rubber layer 12 and the rubber in the rubber- based adhesive composition of the blend layer 14 are composed of the same rubber. In another embodiment, the rubber in the rubber layer 12 and the rubber in the rubber-based adhesive composition of the blend layer 14 are composed of the different rubbers. The silicone-based adhesive composition of the blend layer 14 generally includes a silicone elastomeric polymer and optionally other components including, e.g., tackifying agents, plasticizers and combinations thereof. Examples of suitable silicone elastomeric polymers include, without limitation, urea-based silicone copolymers, oxamide-based silicone copolymers, amide-based silicone copolymers, urethane- based silicone copolymers, polydiorganosiloxane polymers, and mixtures thereof. One suitable silicone-based adhesive composition includes a MQ tackifying resin and a silicone polymer. The MQ tackifying resin and the silicone polymer can be present in the form of, e.g., a blend of MQ tackifying resin and silicone polymer, a reaction product of MQ tackifying resin and silicone polymer, e.g., a condensation cure or addition cure type reaction product, or a mixture thereof. Preferably the silicone polymer is present in the silicone-based adhesive composition in an amount of from about 30% by weight to about 70% by weight or even from about 35% by weight to about 65% by weight. The MQ tackifying resin preferably is present in the silicone-based adhesive composition in an amount of from about 30% by weight to about 70% by weight, from about 40% by weight to about 60% by weight, or even from about 45% by weight to about 55% by weight. Useful MQ tackifying resins include, e.g., MQ silicone resins, MQD silicone resins, and MQT silicone resins, which also may be referred to as copolymeric silicone resins and which preferably have a number average molecular weight of from about 100 to about 50,000 or even from about 500 to about 20,000 and generally have methyl substituents. The MQ silicone resins include both non-functional and functional resins, the functional resins having one or more functionalities including, for example, silicon- bonded hydrogen, silicon-bonded alkenyl and silanol. MQ silicone resins are copolymeric silicone resins having R′3SiO1/2 units (M units) and SiO_4/2 units (Q units). Such resins are described in, for example, Encyclopedia of Polymer Science and Engineering, vol.15, John Wiley & Sons, New York, (1989), pp. 265 to 270, and U.S. Pat. Nos.2,676,182; 3,627,851; 3,772,247; and 5,248,739, and incorporated herein. MQ silicone resins having functional groups are described in U.S. Pat. No.4,774,310, which describes silyl hydride groups, U.S. Pat. No.5,262,558, which describes vinyl and trifluoropropyl groups, and U.S. Pat. No.4,707,531, which describes silyl hydride and vinyl groups, and incorporated herein. The above-described resins are generally prepared in solvent. Dried or solventless MQ silicone resins are prepared as described in U.S. Pat. Nos.5,319,040, 5,302,685 and 4,935,484, and incorporated herein. One example of a useful class of silicone elastomeric polymers is urea- based silicone polymers such as silicone polyurea block copolymers. Silicone polyurea block copolymers include the reaction product of a polydiorganosiloxane diamine (also referred to as a silicone diamine), a diisocyanate, and optionally an organic polyamine. Suitable silicone polyurea block copolymers are represented by the repeating unit: each R is a moiety that, independently, is an alkyl moiety, having about 1 to 12 carbon atoms, and may be substituted with, for example, trifluoroalkyl or vinyl groups, a vinyl radical or higher alkenyl radical represented by the formula R²(CH₂).CH═CH₂ wherein R² is —(CH₂)_b— or —(CH2)_cCH═CH— and a is 1,2 or 3; b is 0, 3 or 6; and c is 3, 4 or 5, a cycloalkyl moiety having from about 6 to 12 carbon atoms and may be substituted with alkyl, fluoroalkyl, and vinyl groups, or an aryl moiety having from about 6 to 20 carbon atoms and may be substituted with, for example, alkyl, cycloalkyl, fluoroalkyl and vinyl groups or R is a perfluoroalkyl group as described in U.S. Pat. No.5,028,679, or a fluorine-containing group, as described in U.S. Pat. No. 5,236,997, or a perfluoroether-containing group, as described in U.S. Pat. Nos.4,900,474 and 5,118,775; typically, at least 50% of the R moieties are methyl radicals with the balance being monovalent alkyl or substituted alkyl radicals having from 1 to 12 carbon atoms, alkenyl radicals, phenyl radicals, or substituted phenyl radicals; each Z is a polyvalent radical that is an arylene radical or an aralkylene radical having from about 6 to 20 carbon atoms, an alkylene or cycloalkylene radical having from about 6 to 20 carbon atoms, in some embodiments Z is 2,6-tolylene, 4,4′- methylenediphenylene, 3,3′-dimethoxy-4,4′-biphenylene, tetramethyl-m-xylylene, 4,4′- methylenedicyclohexylene, 3,5,5-trimethyl-3-methylenecyclohexylcne, 1,6- hexamethylene, 1,4-cyclohexylene, 2,2,4-trimethylhexylene and mixtures thereof; each Y is a polyvalent radical that independently is an alkylene radical of 1 to 10 carbon atoms, an aralkylene radical or an arylene radical having 6 to 20 carbon atoms; each D is selected from the group consisting of hydrogen, an alkyl radical of 1 to 10 carbon atoms, phenyl, and a radical that completes a ring structure including B or Y to form a heterocycle; where B is a polyvalent radical selected from the group consisting of alkylene, aralkylene, cycloalkylene, phenylene, heteroalkylene, including for example, polyethylene oxide, polypropylene oxide, polytetramethylene oxide, and copolymers and mixtures thereof; m is a number that is 0 to about 1000; n is a number that is at least 1; and p is a number that is at least 10, in some embodiments 15 to about 2000, or even 30 to 1500. Useful silicone polyurea block copolymers are disclosed in, e.g., U.S. Pat. Nos. 5,512,650, 5,214,119, 5,461,134, and 7,153,924 and PCT Publication Nos. WO 96/35458, WO 98/17726, WO 96/34028, WO 96/34030 and WO 97/40103. In one embodiment, the silicone-based adhesive composition covers between about 20% and about 50% of the area of the blend layer. In one embodiment, the silicone-based adhesive composition covers at least about 30% of the area of the blend layer. In one embodiment, the silicone-based adhesive composition covers less than about 50% of the area of the blend layer. The rubber-based and silicone-based adhesive compositions can include other additives including, e.g., fillers (e.g., reinforcing and non-reinforcing fillers), compatibilizers, plasticizers, tackifiers, antioxidants, stabilizers (e.g., ultraviolet (“UV”) light stabilizers), antiozonants, curing agents, metal deactivators, pigments, blowing agents, toughening agents, reinforcing agents, fire retardants, and combinations thereof. Examples of useful fillers include silica (e.g., hydrophobic and hydrophilic silica), glass (e.g., ground glass, glass beads and glass bubbles), aluminas, zinc oxides, calcium carbonates, titanium dioxides, carbon blacks, polymeric bubbles and beads (including expanded and unexpanded beads and bubbles), synthetic fibers, and combinations thereof. The adhesive compositions can include additives in amounts sufficient to obtain the desired end properties. Each of the rubber-based adhesive composition and the silicone-based adhesive composition can be a pressure-sensitive adhesive composition or non pressure-sensitive adhesive composition. In practice, the multi-layered differential adhesive 10 can be used in an article, or an adhesive assembly 100. The adhesive assembly 100 generally includes a release liner 16 and the multi-layered differential adhesive 10. The blend layer 14 functions to reduce the anchor of the layered adhesive 10 to the release liner 16. The multi-layered differential adhesive 10, the rubber layer 12, the blend layer 14, and the release liner 16 all include a first major surface 10a, 12a, 14a, and 16a, respectively, and a second major surface 10b, 12b, 14b, and 16b, respectively. The first major surface 14a of the blend layer 14 is disposed on a second major surface 16b of the release liner 16 and a first major surface 12a of the rubber layer 12 is disposed on the second major surface 14b of the blend layer 14, as illustrated in FIG.1. In one embodiment, the release liner 16 is easily and cleanly removable from the blend layer 14 after the adhesive assembly 100 has been stored for at least one week, at least three weeks, or even at least a month at 120° F. (48.9° C.). In one embodiment, the blend layer 14 exhibits a release force to the release liner 16 of less than about 2000 grams/inch, particularly less than about 800 grams/inch after the multi-layer assembly has been stored for 46 days at 120° F, for 88 days at 120° F or even for 365 days at 120° F. In particular, the blend layer 14 exhibits a release force to the release liner 16 of between about 30 and about 250 grams/inch. FIG.2 illustrates an embodiment of the adhesive assembly 100 of FIG.1 wound upon itself in the form of a roll 110 such that the first major surface 14a of the blend layer 14 is in contact with the second major surface 16b of the release liner 16 and the second major surface 12b of the rubber layer 12 is in contact with a first major surface 16aof the release liner 16. (See FIG.3). The exterior layers of the roll 110 of the multi-layer assembly 100 contact each other. The blend layer 14 and the rubber layer 12 exhibit different release properties to the major surfaces of the release liner 16 with which they are in contact. The force required to remove the release liner 16 from either the blend layer 14 or the rubber layer 12 is referred to as the “release force”. When an unwind force is applied to the leading edge of the roll 110, the blend layer 14 exhibits a greater release force to the second major surface 16b of the release liner 16 relative to the release force exhibited by the rubber layer 12 to the first major surface 16a of the release liner 16. This property is referred to as “differential release” and enables the blend layer 14 to remain bonded to the second major surface 16b of the release liner 16 and the rubber layer 12 to cleanly release from first major surface 16a of the release liner 16. The layers of the layered adhesive 10 and the release liner 16 are selected to enable the layers to exhibit differential release to the release liner 16 so that when the leading edge of the adhesive assembly 100 is unwound from the roll 110, the rubber layer 12 cleanly and relatively easily peels away from the first major surface 16a of the release liner 16 and the blend layer 14 remains tightly adhered to the second major surface 16b of the release liner 16. The ratio of the release force exhibited by the blend layer 14 to the release liner 16 (tight side) to the release force exhibited by the composition of the rubber layer 12 to the release liner 16 (easy side) can help with manufacturability. If it is too low, there may be liner confusion where there is picking of the adhesive as it tries to stay on the easy side because the tight side liner release would be too low. In one embodiment, the ratio of the release force exhibited by the blend layer 14 to the release liner 16 to the release force exhibited by the composition of the rubber layer 12 to the release liner 16, or tight side to easy side, is at least about 1.5:1, particularly of at least about 3:1, and more particularly of at least about 10:1. The release liner 16 of the adhesive assembly 110 can be of a variety of forms including, e.g., sheet, web, tape, and film. The release liner 16 exhibits properties that enable the silicone-based adhesive composition to be cleanly released from the surface of the release liner 16 after the adhesive assembly 110 has been stored for at least 30 days at 120° F (49 °C). Preferably, the nature of the release liner 16 is such that the blend layer 14 exhibits a release force to the release liner 16 of less than about 2000 grams/inch, particularly less than about 800 grams/inch after the multi-layer assembly 100 has been stored for 46 days at 120° F, for 88 days at 120° F or even for 365 days at 120° F. In particular, the blend layer 14 exhibits a release force to the release liner 16 of between about 30 and about 250 grams/inch. If the release force is too high, the blend layer 14 cannot be removed from the release liner 16. The release liner 16 can have a paper or film base. At least one surface of the release liner can be treated to alter (e.g., increase or decrease) the force required to remove the release liner from the blend layer. Useful methods of treating the release liner 16 include applying a release agent to the surface of the release liner 16, creating a patterned texture on the surface of the release material to decrease the contact area between an adhesive composition and the release material, and combinations thereof. In applications in which the multi-layer assembly 100 is wound up on itself in the form of a roll 110 such that two different layers of the multi-layered differential adhesive 10 are in contact with the two opposing major surfaces of the release liner 16, the release liner 16 can provide differential release, i.e., the release force exhibited by the layered adhesive 10 at the first major surface of the release liner 16 differs from the release force exhibited by the layered adhesive 10 at the second, opposing major surface of the release liner 16. The properties of the release coatings (e.g., composition and thickness) can be selected based on a variety of factors including, e.g., the chemistry of the composition with which the surface of the release liner will be in contact, the desired release properties (e.g., which adhesive composition is to remain bonded to the release liner upon unwind and which adhesive composition is to release from the release liner upon unwind), and combinations thereof. In one embodiment, the first and second release coatings can be the same and coated at the same or different coating weight. One useful release coating includes a silicone polymer. A variety of release agents are suitable for use on the release liner. Examples of useful classes of release agents include silicone, silicone copolymers including, e.g., silicone acrylates, silicone polyurethanes and silicone polyureas, and other low surface energy-based release compositions, and combinations thereof. In one embodiment, the release liner is a platinum cured silicone. In one embodiment, the release liner may be a densified kraft (DK), extended densified kraft (XL), polycoated kraft (PCK), or extensible polycoated kraft (EK). In one embodiment, the silicone release liner is a PCK liner. The adhesive assembly 100 is extensible, stretchable and preferably cleanly removable (i.e., does not leave a visible residue) from a variety of substrates including, e.g., glass, ceramic, painted wallboard, finished (e.g., stained and varnished) wood and plastics. Plastic substrates include, for example, polyesters such as PET (polyethylene terephthalate), polyacrylates such as PMMA (poly methylmethacrylate), polycarbonates, and the like. The adhesive assembly, after having been bonded to a substrate, is also capable of being removed from the substrate without damaging the substrate. The adhesive assembly 100 optionally includes a backing. FIG.3 illustrates an embodiment of an adhesive assembly 100 that includes a backing 18, the rubber layer 12 disposed on the backing 18, the blend layer 14 disposed on the rubber layer 12, and the release liner 16 disposed on the blend layer 14. In one embodiment, the adhesive assembly 100 is constructed to as a multi-layer stretch releasing pressure-sensitive adhesive assembly, which exhibits stretch releasing properties. A multi-layer stretch releasing pressure-sensitive adhesive assembly, when adhered to a substrate through a pressure-sensitive adhesive composition, exhibits stretch releasing properties including, e.g., being extensible, stretchable and cleanly removable (i.e., is substantially free of visible residue) from at least one of a variety of substrates (e.g., glass, ceramic, drywall, painted drywall, and finished, e.g., stained and varnished, wood) without damaging the substrate. In some embodiments, the multi-layer stretch releasing pressure- sensitive adhesive assembly is constructed to maintain adhesion, while holding a shear load of 2.4 lb per square inch of adhesive area and being exposed to a 115° F. water spray for a period, of at least 10,000 minutes, at least 30,000 minutes or even at least 45,000 minutes. For multi-layer stretch releasing pressure-sensitive adhesive assemblies that include a backing, the backing can be elongated through stretching in the lengthwise direction and is highly extensible. The term “highly extensible” as used herein means that when the backing is stretched in the lengthwise direction, an elongation of at least about 150% is achieved based on the original length. The backing of a stretch releasing pressure- sensitive adhesive assembly preferably is capable of achieving an elongation of from about 50% to about 1,200%, from about 150% to about 700%, or even from about 350% to about 700%. The backing layer 18 can be of any suitable construction. For example, the backing layer 18 can be in the form of a foam, a film, or a combination thereof with any suitable thickness, composition, and opaqueness or clarity. The backing layer 18 can be a single layer of film, a single of foam, multiple layers of film, multiple layers of foam, or multiple layers of foam and film. The backing layer 18 is usually selected to have suitable mechanical properties for use in a stretch release adhesive tape. For example, the backing layer 18 is selected so that it can be stretched (elongated) in a first direction (e.g., a lengthwise direction) at least 50 percent without breaking. That is, at least one dimension such as the length of the backing layer 18 can be increased through stretching at least 50 percent without breaking. In some embodiments, the backing layer 18 can be stretched at least 100 percent, at least 150 percent, at least 200 percent, at least 300 percent, at least 400 percent, or at least 500 percent without breaking. The backing layer 18 can often be stretched up to 1200 percent, up to 1000 percent, up to 800 percent, up to 750 percent, or up to 700 percent without breaking. These relatively large elongation values facilitate stretch releasing of the adhesive tape after being adhered to a substrate. The Young's Modulus of the backing layer 18 can be an indicator of the resistance of the backing layer to stretching. The Young's modulus is often at least about 1,000 psi (about 7 MPa), at least about 2,500 psi (about 17 MPa), or even at least about 3,000 psi (about 21 MPa), no greater than about 72,500 psi (about 500 MPa), or no greater than about 50,000 psi (about 345 MPa). The polymer film preferably is capable of achieving the desired elongation at break in at least one of the machine direction and the cross direction of the film. For some film backing layers such as those described below that contain a poly(alkylene) copolymer, the Young's Modulus is often in the range of about 10 MPa to about 75 MPa. For example, the Young's Modulus can be in the range of 20 to 75 MPa, in the range of 20 to 60 MPa, in the range of 20 to 50 MPa, or in the range of 25 to 50 MPa. The Young's Modulus can be measured, for example, using method ASTM D790- 07 or ASTM D882-02. The tensile strength of the backing layer 18 is an indicator of the load that the backing layer 18 can sustain without breaking and is an indicator of how far the backing layer 18 can be stretched without breaking. Any tensile strength is suitable as long as the backing layer can be stretched at least 50 percent without breaking. The tensile strength is often in the range of about 10 MPa to about 60 MPa or higher. For example, the tensile strength can be in the range of 10 to 60 MPa, in the range of 10 to 50 MPa, in the range of 20 to 60 MPa, in the range of 20 to 55 mPa, or in the range of 25 to 50 MPa. The tensile strength can be measured using method ASTM D882-02. In many applications, the foam or film backing layers are prepared from a polymeric material such as, for example, a polyolefin (e.g., polyethylene such as high density polyethylene, low density polyethylene, linear low density polyethylene, and linear ultralow density polyethylene, polypropylene, and polybutylene), vinyl copolymers (e.g., polyvinyl chloride and polyvinyl acetates), olefinic copolymers (e.g., ethylene/methacrylate copolymers, ethylene/vinyl acetate copolymers, and ethylene/propylene copolymers), acrylonitrile-butadiene-styrene copolymers, acrylic polymers and copolymers, polyurethanes, and combinations or blends thereof. Exemplary blends include polypropylene/polyethylene blends, polyurethane/polyolefin blends, polyurethane/polycarbonate blends, and polyurethane/polyester blends. Other suitable blends can include, for example, blends of thermoplastic polymers, elastomeric polymers and combinations thereof. Suitable blends can include, for example, styrene-butadiene copolymers, polychloroprenes (i.e., neoprene), nitrile rubbers, butyl rubbers, polysufide rubbers, cis-1,4-polyisoprenes, ethylene-propylene terpolymers (e.g., EPDM rubber), silicone rubbers, silicone polyurea block copolymers, polyurethane rubbers, polyisobutylenes, natural rubbers, acrylate rubbers, thermoplastic rubbers (e.g., styrene-butadiene block copolymers and styrene-isoprene-styrene block copolymers), and thermoplastic polyolefin rubber materials. A useful foam backing layer is typically conformable and assists in increasing the degree of surface contact between the pressure-sensitive adhesive layer disposed thereon and the surface of the substrate. The foam layer preferably is capable of achieving from about 50 percent to about 600 percent elongation (i.e., the foam layer is stretchable at least 50 percent to 600 percent). The elongation at break is preferably sufficiently high so that the backing layer remains intact during removal of the adhesive tape from a substrate to which it has been adhered. The multi-layer stretch releasing pressure-sensitive adhesive assembly 100 optionally includes a non-tacky tab (not shown in the Figures). The non-tacky tab can be grasped and pulled by a user to stretch the multi-layer stretch releasing pressure-sensitive adhesive assembly during the removal process, so as to remove the assembly from the object or substrate to which it has been affixed. The tab can exist in a variety of forms. In one embodiment, the tab is a portion of the backing that is free of pressure-sensitive adhesive composition. In other embodiments, the tab includes a cover layer that is adhered to and covers over the pressure-sensitive adhesive composition. In another embodiment, the tab is a separate component that is affixed to an end portion of the backing. In another embodiment, the tab is created by detackifying the pressure-sensitive adhesive composition using any suitable method including, e.g., applying powder (e.g., baking powder (i.e., calcium carbonate) and titanium dioxide), exposure to radiation (e.g., ultraviolet light), over coating with varnish or ink, and combinations thereof. The adhesive assembly can be prepared using any suitable method including, e.g., coating the layers directly on each other (e.g., simultaneously, sequentially and combinations thereof), forming a first layer (e.g., by coating a composition on a release liner) and subsequently laminating the first layer to a second layer, coextruding at least two of the layers, and combinations thereof. One useful method of making the adhesive assembly 100 includes coating the multi-layered differential adhesive 10 on a release liner and 16 subsequently coating the rubber layer 12 directly on the multi-layered differential adhesive 10. The rubber layer can be coated on the multi-layered differential adhesive while the multi-layered differential adhesive is still wet. The rubber layer can be uncured (i.e., wet, molten, uncrosslinked or only partially crosslinked) when it is coated on the multi-layered differential adhesive. Other useful coating methods include slot die, knife, slot fed knife, gravure, rod, curtain coating, and other methods for coating solvent, water- based and hot melt compositions. During processing, the blend layer 14 works to reduce liner release while maintaining performance. The multi-layered differential adhesive 10 itself provides the required liner differential needed for manufacturing. The individual layers of the adhesive assembly are continuous. The individual layers of the adhesive assembly can also be self-supporting or supported by another layer, substrate (e.g., a backing) and combinations thereof. To improve adhesion of one pressure-sensitive adhesive layer to another layer (e.g., another pressure-sensitive adhesive layer or an elastomeric layer), at least one of the layers can be treated to improve interlayer adhesion. Examples of useful treatment methods include, e.g., chemical priming, corona discharge, plasma discharge, flame treatment, electron beam irradiation, ultraviolet (UV) radiation, acid etching, and combinations thereof. The treatment can optionally be performed with a reactive chemical adhesion promoter including, e.g., hydroxyethylacrylate, hydroxyethyl methacrylate, another reactive species of low molecular weight and combinations thereof. In one method, a primer is applied to the surface of the pressure-sensitive adhesive layer prior to contacting the layer with a second layer (e.g., elastomer or pressure-sensitive adhesive composition). Examples of useful primers are described, e.g., in U.S. Pat. Nos.5,677,376 (Groves) and 6,008,286 (Groves), and incorporated herein. A stretch releasing pressure-sensitive assembly can be formed using any suitable method for preparing pressure-sensitive adhesive assemblies including, e.g., coating a composition directly on a substrate (e.g., a backing), forming a layer (e.g., by coating a composition on a release liner) and subsequently laminating the layer to a backing, coextruding, and combinations thereof. A variety of methods for preparing stretch releasing pressure-sensitive adhesive assemblies can be used to form the multi-layer stretch releasing pressure-sensitive adhesive assembly. In some methods, a composition of the layered adhesive is coated directly onto a substrate (e.g., a backing), formed as a separate layer (e.g., coated onto a release liner) and then laminated to a layer (e.g., a backing, another layer (e.g., an elastomer or a pressure-sensitive adhesive layer), or a combination thereof. Examples of useful methods of making stretch releasing pressure-sensitive adhesive articles and assemblies are also described in U.S. Pat. Nos.6,569,521, 6,403,206, 6,001,471 and 5,516,581 and PCT Publication No. WO 2005/059055, and incorporated herein. The multi-layer stretch releasing pressure-sensitive adhesive assembly can be constructed in a variety of forms including, e.g., a tape, a strip, a sheet, a web, a roll, a label, and combinations thereof. The multi-layered differential adhesive and adhesive assemblies described herein are suitable for use in a variety of applications including, e.g., bonding two substrates together, mounting applications using articles including, e.g., hooks, hangers, and holders, e.g., holders for razors, sponges, shampoo bottles, towels, articles that are located in wet or high humidity environments such as those found in bathrooms, e.g., toilets (including, e.g., toilet tanks), tubs, sinks, and walls, showers, locker rooms, steam rooms, pools, hot tubs, kitchens, e.g., kitchen sinks, dishwashers and back splash areas, refrigerators and coolers, and articles that are used in low temperatures applications including outdoor applications and refrigerators. Useful outdoor applications include bonding articles including, e.g., signage, to outdoor surfaces such as windows and vehicles. In some embodiments, the multi-layer stretch releasing pressure-sensitive adhesive article is well suited for adhesion to glass (e.g., windows), ceramic, marble, granite, or a combination thereof. The multi-layered differential adhesive 10 and adhesive assemblies 100 can be used in a variety of other constructions and applications including, e.g., (1) mounting applications on surfaces such as painted drywall, plaster, concrete, glass, ceramic, fiberglass, metal or plastic, wall hangings, organizers, holders, baskets, containers, decorations, e.g., holiday decorations, calendars, posters, dispensers, wire clips, body side molding on vehicles, carrying handles, signage applications, e.g., road signs, vehicle markings, transportation markings, and reflective sheeting; (2) joining and assembling applications including, e.g., adhering at least two containers, e.g., boxes, for later separation; (3) cushioning and sound deadening applications including, e.g., cushioning materials for placement beneath objects, sound insulative sheet materials, and combinations thereof, (4) closure applications including, e.g., container closures, e.g., box closures, closures for food containers, closures for beverage containers, diaper closures, and surgical drape closures; (5) vibration damping; (6) sealing applications, e.g., gaskets, for liquids, vapors (e.g., moisture), and dust; (7) thermal insulation; (8) labeling, e.g., removable labels including, e.g., notes, price tags, and identification labels on containers, and signage; (9) medical applications (e.g., bandages, medical device labeling (e.g., in hospital settings) wound care); (10) fastening applications, e.g., fastening one object, e.g., a vase, to another object, e.g., a table or a book shelf, (11) securing applications, e.g., fastening one or more components of a locking mechanism to a substrate, e.g., a child safety lock to a cabinet or cupboard; (12) tamper indicating applications (e.g., tamper indicating articles); and (13) wire and cord organizers, holders, and clips. The multi-layered differential adhesive 10 and adhesive assemblies 100 can also be incorporated in a variety of other constructions including, e.g., abrasive articles (e.g., for sanding), articles for sanding and polishing applications (e.g., buffing pads, disc pads, hand pads, and polishing pads), pavement marking articles, and carpeting (e.g., backing for carpeting). The multi-layered differential adhesive 10 and adhesive assemblies 100 can be provided in any useful form including, e.g., tape, strip, sheet (e.g., perforated sheet), label, roll, web, disc, and kit (e.g., an object for mounting and the multi-layer stretch releasing pressure-sensitive adhesive assembly). Likewise, multi-layered differential adhesive and adhesive assemblies can also be provided in any suitable form including, e.g., tape, strip, sheet (e.g., perforated sheet), label, roll, web, disc, kit, stack, tablet, and combinations thereof in any suitable package including, e.g., dispenser, bag, box, and carton. A variety of objects can be used to mount articles on the multi-layered differential adhesive 10 and adhesive assemblies 100 including, e.g., hooks, separable connector systems, examples of which are described in U.S. Pat. Nos.6,972,141, 6,692,807 and 6,572,945 and incorporated herein, and combinations thereof. Suitable hook configurations for use in combination with a stretch releasing pressure-sensitive adhesive article for mounting applications are described in U.S. Pat. No.5,507,464 and U.S. Des. Pat. Nos. D386,067 and D480,292, and incorporated herein. The multi-layered differential adhesive 10 and adhesive assemblies 100 can also be a component of an article that includes a substrate, e.g., a mounting device, and a stretch releasing pressure-sensitive adhesive article adhered to a surface of the substrate. The article can include a release liner disposed on an adhesive surface of the multi-layer stretch releasing pressure-sensitive adhesive article or assembly that is not in contact with the substrate. The multi-layered differential adhesive 10 and adhesive assemblies 100 can also be a component of a kit that includes, e.g., at least one tape and each tape may have a different property, e.g., dimensions, and at least one device, e.g., hook, holder, hanger, decoration, part, label or a combination thereof, packaged together as a unit. Examples The present invention is more particularly described in the following examples that are intended as illustrations only, since numerous modifications and variations within the scope of the present invention will be apparent to those skilled in the art. Unless otherwise noted, all parts, percentages, and ratios reported in the following examples are on a weight basis. Test Procedures Test procedures used in the examples include the following. Test Method 1: Scanning Electron Microscopy (SEM) Analysis for Silicone Coverage SEM analysis of coated adhesive samples was done to measure the area of silicone coverage on the surface. Samples of adhesive-coated liner were cut to small (0.5” x 0.5”) squares and secured to the sample plate with the liner facing upward. The liner was then removed from the adhesive sample, and the sample was then sputter coated with gold using a sputter coater – 90 seconds at 0.2 mV and 10^-2 mbar vacuum. After the adhesive sample was sputter coated the sample plate was placed into the desktop SEM device (“Tabletop Microscope TM4000Plus II” from Hitachi High-Tech Corp. or similar). The SEM images were collected using the backscattered electron (BSE) detector, accelerating voltage of 15kV, and magnification of 50x. Multiple images were taken of adjacent adhesive areas to allow for averaging over an area of at least 4mm x 4mm. After the SEM images were collected, the silicone coverage on the surface of each sample was quantified using an image analysis software like ImageJ, a software from National Institutes of Health, or similar. Measurements were completed for multiple adjacent regions to get an average coverage area. In most cases 4 to 9 adjacent regions were imaged and analyzed. Test Method 2: Adhesive Liner Release Testing The adherence of a layer to a release liner was tested according to ASTM D3330/D3330M-04 entitled, “Standard Test Method for Peel Adhesion of Pressure- Sensitive Tape.” according to Test Method D with the following modifications. Test samples evaluated were of dimension 0.5 in (inch)x5 in (1.27 cm (centimeter)x12.7 cm). Samples were tested using a Thwing Albert Friction/Peel Tester operating with a 1 second pre-peel followed with a 20 second response measurement time during which the peel force was averaged. Three samples were tested with the average peel force reported. Test Method 3: Shear Adhesion Testing (Modified ASTM D3654-82) Static shear was determined according to the method of ASTM D3654-82 entitled, “Holding Power of Pressure-Sensitive Tapes,” with the following modifications. The release liner(s), where present, was removed from the test sample. Test samples having the dimensions 0.5 in×0.5 in (1.27 cm ×1.27 cm) were adhered to the test substrate through the adhesive composition at 72° F. (i.e., 22° C.) and 50% relative humidity by passing a 15 lb (6.8 kg) hand held roller over the length of the sample two times at a rate of 12 in/min (30.48 cm/min). A metal vapor coated polyester film having the dimensions 0.75 in×4 in (1.91 cm×10.16 cm) was bonded to one side of the adhesive test sample for the purpose of attaching the load. The test sample was allowed to dwell on the test substrate for 1 hour at 22° C and 50% relative humidity; thereafter a 1 kg weight was applied to the metal vapor coated polyester film. The time to failure was recorded in minutes and the average value, calculated pursuant to procedures A and C of section 10.1 of the standard, for all of the test samples was reported. Six samples were tested and the average time to failure of the six samples and the failure mode (where present) of each sample was recorded. A value was reported with a greater than symbol (i.e., >) when at least one of the six samples had not failed at the time the test was terminated. Materials Rubber Adhesive Composition (Rubber PSA) A pressure-sensitive adhesive composition was prepared and consisted of a tackified styrene-butadiene-styrene rubber with addition of toluene to adjust final solids of the solution mixture to 40% after shear mixing. Silicone Adhesive Composition (Silicone PSA) A pressure-sensitive adhesive composition was prepared according to the method of Example 27 of U.S. Pat. No.6.569,521 (Sheridan) and incorporated herein. Silicone Release Liner The silicone release liner is a 103 gram per square meter double side PE coated paper stock coated on its two major surfaces with solventless silicone release (Felix Schoeller Release, R60501). 36 Mil Multi-Layer Composite Foam Laminate Backing The 36 mil multi-layer composite foam laminate backing includes a polyethylene vinyl acetate copolymer foam having a density of 6 pounds per cubic foot laminated between two pieces of 0.0046 cm (1.80 mil) thick linear low-density poly ethylene film. The film layers of the composite foam laminate are treated with a chemical primer prepared according to Example 15 of U.S. Pat. No.5,677,376 (Groves) prior to adhesive lamination. Preparation of Adhesive-coated Liner Samples Used in the Examples (1-14) For all examples, adhesives were mixed (per the ratios contained in Table 1) and coated with a target dried blend layer thickness of approximately 2 mil (0.05 mm). The blend layer was dried at temperatures of 140˚F to 200˚F (60 °C to 93 °C) with the final residuals remaining after drying being approximately 5% or less. The dried, blend adhesive-coated liner was then coated with the rubber adhesive targeting a dried rubber layer thickness of approximately 0.75 mil (0.019 mm). This second layer was dried at temperatures of 200˚F to 240˚F (93 °C to 115 °C) with the final residuals remaining after drying being no more than 2.5%. Table 1 E^{xample Rubber PSA,} Silicone PSA, s_{olid parts} solid parts Comp. Ex. A 0 100 Comp. Ex. B 100 0 1 30 70 2 40 60 3 46 54 4 48 52 5 50 50 6 52 48 7 54 46 8 56 44 9 58 42 10 60 40 11 62 38 12 64 36 13 70 30 14 80 20 The adhesive-coated liner samples described in Table 1 were then tested and characterized using various tests for performance. The examples in Table 1 were laminated to both sides of various substrates including films and foams to measure the shear adhesion. The results from the various tests are included in Table 2. Table 2 E^{xample Silicone} Liner Liner Differential, CTH Painted Drywall C_{overage, %} Release, Tight/Easy-side Shear Testing, g/in Liner Release minutes C^{omp. Ex. A} _{100% NT NT >25,000} C^{omp. Ex. B} _0% ^{NT NT} _{>25,000 1 86%} ^{NT NT NT} 2 _85% ^{NT NT NT 3} _{88% 1259 63 >25,000} 4 _{87% 1147 57} ^>25,000 5 _{84% 1056 53} ^{>25,000 6} _{78% 938 47} ^{>25,000 7} _{68% 941 47} ^>25,000 8 _{67% 820 41} ^{>25,000 9} _{46% 274 14} ^{>25,000 10} _{31% 121 6} ^>25,000 1_{1 30% 92 5} ^{>25,000 12} _{16% 29 2} ^>25,000 1_{3 5%} ^{NT NT NT} 1_{4 3%} ^{NT NT NT} NT = not tested CTH = controlled temperature (72 °F, 22 °C) and relative humidity (50%) Although specific embodiments of this invention have been shown and described herein, it is understood that these embodiments are merely illustrative of the many possible specific arrangements that can be devised in application of the principles of the invention. Numerous and varied other arrangements can be devised in accordance with these principles by those of ordinary skill in the art without departing from the spirit and scope of the invention. Thus, the scope of the present invention should not be limited to the structures described in this application, but only by the structures described by the language of the claims and the equivalents of those structures.

Claims

What is claimed is: 1. A layered adhesive comprising: a rubber layer; and a blend layer comprising a rubber-based adhesive composition and a silicone-based adhesive composition.

2. The layered adhesive of claim 1, wherein the blend layer comprises between about 30% to about 80% of the rubber-based adhesive composition by weight.

3. The layered adhesive of claim 2, wherein the blend layer comprises between about 58% to about 70% of the rubber-based adhesive composition by weight.

4. The layered adhesive of claim 3, wherein the blend layer comprises between about 60% to about 64% of the rubber-based adhesive composition by weight.

5. The layered adhesive of claim 1, wherein the silicone-based adhesive composition comprises a urea-based silicone polymer.

6. The layered adhesive of claim 1, wherein the silicone-based adhesive composition comprises silicone polyurea block copolymers.

7. The layered adhesive of claim 1, wherein the rubber in the rubber layer and the rubber in the rubber-based adhesive composition comprise the same rubber.

8. The layered adhesive of claim 1, wherein the rubber-based adhesive composition comprises a tackified rubber.

9. The layered adhesive of claim 1, wherein the silicone-based adhesive composition comprises MQ resin.

10. The layered adhesive of claim 1, wherein the blend layer includes a first major surface and a second major surface, wherein the second major surface is positioned adjacent the rubber layer, and wherein the silicone-based adhesive composition covers between about 20% and about 50% of the first major surface of the blend layer.

11. The layered adhesive of claim 1, wherein the blend layer includes a first major surface and a second major surface, wherein the second major surface is positioned adjacent the rubber layer, and wherein the silicone-based adhesive composition covers at least about 30% of the first major surface of the blend layer.

12. The layered adhesive of claim 1, wherein the blend layer includes a first major surface and a second major surface, wherein the second major surface is positioned adjacent the rubber layer, and wherein the silicone-based adhesive composition covers less than about 50% of the first major surface of the blend layer.

13. A multi-layered differential adhesive comprising: a rubber layer; and a urea-based silicone polymer and rubber blend layer.

14. The multi-layered differential adhesive of claim 13, wherein the blend layer comprises between about 30% to about 80% rubber by weight.

15. The multi-layered differential adhesive of claim 14, wherein the blend layer comprises between about 58% to about 70% rubber by weight.

16. The multi-layered differential adhesive of claim 15, wherein the blend layer comprises between about 60% to about 64% rubber by weight.

17. The multi-layered differential adhesive of claim 13, wherein the urea-based silicone polymer comprises silicone polyurea block copolymers.

18. The multi-layered differential adhesive claim 13, wherein the blend layer includes MQ resin.

19. The multi-layered differential adhesive claim 13, wherein the rubber in the blend layer comprises a tackifier.

20. The multi-layered differential adhesive claim 13, wherein the blend layer includes a first major surface and a second major surface, wherein the second major surface is positioned adjacent the rubber layer, and wherein the urea-based silicone polymer covers between about 20% and about 50% of the first major surface of the blend layer.

21. An article comprising: a silicone release liner including a tight side and an easy side; and a multi-layered differential adhesive comprising: a rubber layer; and a rubber-based adhesive composition and a silicone-based adhesive composition blend layer, wherein the tight side is between the silicone release liner and the blend layer and the easy side is between the silicone release liner and the rubber layer, and wherein the tight side and the easy side have a differential ratio of at least about 1.5.

22. The article of claim 21, wherein the tight side and the easy side have a differential ratio of at least about 3.

23. The article of claim 21, wherein the tight side and the easy side have a differential ratio of at least about 10.

24. The article of claim 21, wherein the tight side and the easy side comprise the same silicone polymer.

25. The article of claim 21, wherein the silicone release liner comprises a poly-coated kraft liner.

26. The article of claim 21, wherein the tight side has a peel force of less than about 2000 grams/inch.

27. The article of claim 21, wherein the tight side has a peel force of less than about 800 grams/inch.

28. The article of claim 21, wherein the tight side has a peel force of between about 30 and about 250 grams/inch.

29. The article of claim 21, wherein the blend layer comprises between about 30% to about 80% of the rubber-based adhesive composition by weight.

30. The article of claim 21, wherein the blend layer includes a first major surface and a second major surface, wherein the second major surface is positioned adjacent the rubber layer, and wherein the silicone-based adhesive composition covers between about 20% and about 50% of the first major surface of the blend layer.