Classifications

• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B32—LAYERED PRODUCTS
  • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
  • B32B5/00—Layered products characterised by the non- homogeneity or physical structure, i.e. comprising a fibrous, filamentary, particulate or foam layer; Layered products characterised by having a layer differing constitutionally or physically in different parts
  • B32B5/18—Layered products characterised by the non- homogeneity or physical structure, i.e. comprising a fibrous, filamentary, particulate or foam layer; Layered products characterised by having a layer differing constitutionally or physically in different parts characterised by features of a layer of foamed material
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B32—LAYERED PRODUCTS
  • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
  • B32B27/00—Layered products comprising a layer of synthetic resin
  • B32B27/06—Layered products comprising a layer of synthetic resin as the main or only constituent of a layer, which is next to another layer of the same or of a different material
  • B32B27/065—Layered products comprising a layer of synthetic resin as the main or only constituent of a layer, which is next to another layer of the same or of a different material of foam
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B32—LAYERED PRODUCTS
  • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
  • B32B27/00—Layered products comprising a layer of synthetic resin
  • B32B27/32—Layered products comprising a layer of synthetic resin comprising polyolefins
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B32—LAYERED PRODUCTS
  • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
  • B32B5/00—Layered products characterised by the non- homogeneity or physical structure, i.e. comprising a fibrous, filamentary, particulate or foam layer; Layered products characterised by having a layer differing constitutionally or physically in different parts
  • B32B5/22—Layered products characterised by the non- homogeneity or physical structure, i.e. comprising a fibrous, filamentary, particulate or foam layer; Layered products characterised by having a layer differing constitutionally or physically in different parts characterised by the presence of two or more layers which are next to each other and are fibrous, filamentary, formed of particles or foamed
  • B32B5/32—Layered products characterised by the non- homogeneity or physical structure, i.e. comprising a fibrous, filamentary, particulate or foam layer; Layered products characterised by having a layer differing constitutionally or physically in different parts characterised by the presence of two or more layers which are next to each other and are fibrous, filamentary, formed of particles or foamed at least two layers being foamed and next to each other
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B32—LAYERED PRODUCTS
  • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
  • B32B7/00—Layered products characterised by the relation between layers; Layered products characterised by the relative orientation of features between layers, or by the relative values of a measurable parameter between layers, i.e. products comprising layers having different physical, chemical or physicochemical properties; Layered products characterised by the interconnection of layers
  • B32B7/02—Physical, chemical or physicochemical properties
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B32—LAYERED PRODUCTS
  • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
  • B32B7/00—Layered products characterised by the relation between layers; Layered products characterised by the relative orientation of features between layers, or by the relative values of a measurable parameter between layers, i.e. products comprising layers having different physical, chemical or physicochemical properties; Layered products characterised by the interconnection of layers
  • B32B7/04—Interconnection of layers
  • B32B7/12—Interconnection of layers using interposed adhesives or interposed materials with bonding properties
• • C—CHEMISTRY; METALLURGY
  • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
  • C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
  • C09J7/00—Adhesives in the form of films or foils
  • C09J7/20—Adhesives in the form of films or foils characterised by their carriers
  • C09J7/22—Plastics; Metallised plastics
  • C09J7/26—Porous or cellular plastics
• • C—CHEMISTRY; METALLURGY
  • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
  • C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
  • C09J7/00—Adhesives in the form of films or foils
  • C09J7/20—Adhesives in the form of films or foils characterised by their carriers
  • C09J7/29—Laminated material
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B32—LAYERED PRODUCTS
  • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
  • B32B2255/00—Coating on the layer surface
  • B32B2255/26—Polymeric coating
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B32—LAYERED PRODUCTS
  • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
  • B32B2266/00—Composition of foam
  • B32B2266/02—Organic
  • B32B2266/0214—Materials belonging to B32B27/00
  • B32B2266/025—Polyolefin
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B32—LAYERED PRODUCTS
  • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
  • B32B2266/00—Composition of foam
  • B32B2266/02—Organic
  • B32B2266/0214—Materials belonging to B32B27/00
  • B32B2266/0278—Polyurethane
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B32—LAYERED PRODUCTS
  • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
  • B32B2307/00—Properties of the layers or laminate
  • B32B2307/50—Properties of the layers or laminate having particular mechanical properties
  • B32B2307/51—Elastic
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B32—LAYERED PRODUCTS
  • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
  • B32B2307/00—Properties of the layers or laminate
  • B32B2307/70—Other properties
  • B32B2307/732—Dimensional properties
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B32—LAYERED PRODUCTS
  • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
  • B32B2605/00—Vehicles
• • C—CHEMISTRY; METALLURGY
  • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
  • C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
  • C09J2203/00—Applications of adhesives in processes or use of adhesives in the form of films or foils
  • C09J2203/318—Applications of adhesives in processes or use of adhesives in the form of films or foils for the production of liquid crystal displays
• • C—CHEMISTRY; METALLURGY
  • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
  • C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
  • C09J2301/00—Additional features of adhesives in the form of films or foils
  • C09J2301/10—Additional features of adhesives in the form of films or foils characterized by the structural features of the adhesive tape or sheet
  • C09J2301/12—Additional features of adhesives in the form of films or foils characterized by the structural features of the adhesive tape or sheet by the arrangement of layers
  • C09J2301/124—Additional features of adhesives in the form of films or foils characterized by the structural features of the adhesive tape or sheet by the arrangement of layers the adhesive layer being present on both sides of the carrier, e.g. double-sided adhesive tape
• • C—CHEMISTRY; METALLURGY
  • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
  • C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
  • C09J2301/00—Additional features of adhesives in the form of films or foils
  • C09J2301/10—Additional features of adhesives in the form of films or foils characterized by the structural features of the adhesive tape or sheet
  • C09J2301/16—Additional features of adhesives in the form of films or foils characterized by the structural features of the adhesive tape or sheet by the structure of the carrier layer
  • C09J2301/162—Additional features of adhesives in the form of films or foils characterized by the structural features of the adhesive tape or sheet by the structure of the carrier layer the carrier being a laminate constituted by plastic layers only
• • C—CHEMISTRY; METALLURGY
  • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
  • C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
  • C09J2301/00—Additional features of adhesives in the form of films or foils
  • C09J2301/30—Additional features of adhesives in the form of films or foils characterized by the chemical, physicochemical or physical properties of the adhesive or the carrier
  • C09J2301/302—Additional features of adhesives in the form of films or foils characterized by the chemical, physicochemical or physical properties of the adhesive or the carrier the adhesive being pressure-sensitive, i.e. tacky at temperatures inferior to 30°C
• • C—CHEMISTRY; METALLURGY
  • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
  • C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
  • C09J2400/00—Presence of inorganic and organic materials
  • C09J2400/20—Presence of organic materials
  • C09J2400/24—Presence of a foam
  • C09J2400/243—Presence of a foam in the substrate
• • C—CHEMISTRY; METALLURGY
  • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
  • C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
  • C09J2423/00—Presence of polyolefin
  • C09J2423/006—Presence of polyolefin in the substrate
• • C—CHEMISTRY; METALLURGY
  • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
  • C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
  • C09J2475/00—Presence of polyurethane
  • C09J2475/006—Presence of polyurethane in the substrate

Definitions

• the present disclosure relates to adhesive tapes, and more particularly to, double sided adhesive tapes.
• Adhesive tapes have been used in various industries to adhere two components together.
• adhesive tapes have been used in electronic applications to adhere a screen panel to a housing, such as in the case of a mobile device.
• existing adhesive tapes can exhibit damage of adhesive layer cohesion or stripping from the substrate layer of the adhesive tape, which causes a residue to remain on the adherend. Accordingly, a need exists for an improved adhesive tape.
• FIG. 1 includes an illustration of a cross-sectional view of an adhesive tape according to an embodiment of this disclosure.
• FIG. 2 includes an illustration of a cross-sectional view of an adhesive tape according to another embodiment of this disclosure.
• FIG. 3 includes an illustration of a cross-sectional view of an adhesive tape according to yet another embodiment of this disclosure.
• FIG. 4 includes an illustration of a cross-sectional view of an adhesive tape according to yet another embodiment of this disclosure.
• FIG. 5 includes an illustration of a cross-sectional view of an article according to an embodiment of this disclosure.
• FIG. 6 includes an illustration of a cross-sectional view of separating core layers according to an embodiment of this disclosure.
• FIG. 7 includes an illustration of a cross-sectional view of separating an adhesive layer from a component according to an embodiment of this disclosure.
• the term“core” in reference to a section of an adhesive tape refers to all layers between the outermost adhesive layers.
• the present disclosure is directed to adhesive tapes, articles adhered via the adhesive tapes, and methods of making and using the adhesive tapes.
• the adhesive tapes are structured such that the adhesive tape internally delaminates within the core during separation of adhered components thereby allowing easy removal of one or both of the split adhesive tape parts from the respective components while leaving essentially no residue on the components.
• FIG. 1 includes an illustration of a cross-sectional view of an adhesive tape 10 according to one embodiment of the present disclosure. It is to be understood that fewer, additional, or different layers or layer sequencing than is illustrated in FIG. 1 can be employed within the scope of the present disclosure, and that the adhesive tape illustrated in FIG. 1 is but one exemplary embodiment.
• the adhesive tape 10 can include a first adhesive layer 20 and a second adhesive layer 30.
• the first adhesive layer 20 can define a first outer major surface 22 of the adhesive tape 10.
• the second adhesive layer 30 can define a second outer major surface 32 of the adhesive tape 10.
• the adhesive tape 10 can also include a core 40.
• the core 40 can separate, or be sandwiched between, the first adhesive layer 20 and the second adhesive layer 30 of the adhesive tape 10.
• the core 40 can contain a first core layer 42 and a second core layer 43.
• the first core layer 42 can be disposed adjacent the first adhesive layer 20 and the second core layer 43 can be disposed adjacent the second adhesive layer 30. As illustrated in FIG. 1, the first core layer 42 can be directly adjacent and contacting the second core layer 43.
• first core layer 42 and the second core layer 43 can be distinct layers.
• distinct layers refers to layers that are separately formed, are separate pieces, or are different in at least one of composition, structure, or processing.
• first core layer 42 and the second core layer 43 can be distinct where they are separate pieces but made of the essentially the same composition.
• the first adhesive layer 20 and the second adhesive layer 30 each comprise an adhesive, either the same adhesive or different adhesives.
• the first adhesive layer 20, the second adhesive layer 30, or both can comprise a pressure sensitive adhesive.
• both the first and the second adhesive layers 20, 30 comprise a pressure sensitive adhesive.
• the first adhesive layer 20 and the second adhesive layer 30 can comprise the same pressure sensitive adhesive or different pressure sensitive adhesives.
• the first adhesive layer 20 and the second adhesive layer 30 comprise the same pressure sensitive adhesive.
• the pressure sensitive adhesive can include a rubber- based pressure sensitive adhesive, an acrylic-based pressure sensitive adhesive, a silicone- based pressure sensitive adhesive, a polyurethane-based pressure sensitive adhesive, or combinations thereof.
• the first or second adhesive layers 20, 30 include a rubber-based pressure sensitive adhesive or an acrylic-based pressure sensitive adhesive.
• the first adhesive layer 20 and the second adhesive layer 30 each have a thickness measured from its outer major surface (22, 32) to its interface near the core 40.
• the adhesive layers 20, 30 can each have a thickness of at least about 5 microns, at least about 10 microns, or even at least about 30 microns.
• the adhesive layers 20, 30 can each have a thickness of no greater than about 150 microns, no greater than about 100 microns, no greater than about 80 microns, or even no greater than about 60 microns. Moreover, in still further embodiments, the adhesive layers 20, 30 can each have a thickness in a range of any of the minimums and maximums provided above, such as in a range of from about 10 microns to about 80 microns, or even from about 30 microns to about 60 microns.
• the first adhesive layer 20 can have generally the same thickness as the second adhesive layer 30. In other embodiments, the first adhesive layer 20 can have a different thickness than the second adhesive layer 30. In particular embodiments, a ratio of the thickness of the first adhesive layer 20 to the thickness of the second adhesive layer 30 can be in a range of from about 0.1 to about 10.
• the first adhesive layer 20 and the second adhesive layer 30 have an adhesive strength measured according to ASTM D1000.
• the first and second adhesive layers 20, 30 each have an adhesive strength that is greater than the adhesive strength of at least one other interface within the adhesive tape, such as the adhesive strength between core layers, between a core layer and a third adhesive layer, or the like.
• the interface within the adhesive tape will separate before the adhesive layers separate from a given component.
• the first and/or second adhesive layers 20, 30 can have an adhesive strength in range of from about 4N/cm to about 20N/cm.
• the first and second adhesive layers 20, 30 can have a generally similar adhesive strength, such as within about 10% of each other. In other embodiments, the first and second adhesive layers 20, 30 can have different adhesive strengths. For example, in certain embodiments, a ratio of the adhesive strength of the first adhesive layer 20 to the adhesive strength of the second adhesive layer 30 can be in a range of from about 0.1 to about 10, from about 0.2 to 5, or even from about 0.5 to 2.
• FIG. 2 includes a cross-sectional view of an adhesive tape 10 according to another embodiment of the present disclosure. It is to be understood that fewer, additional, or different layers or layer sequencing than is illustrated in FIG. 2 can be employed within the scope of the present disclosure, and that the adhesive tape illustrated in FIG. 2 is but one exemplary embodiment.
• FIG. 2 can include the adhesive layers 20, 30, as described above, separated by a core 40.
• the core 40 of FIG. 2 can include a first core layer 44 and a second core layer 45.
• a third adhesive layer 50 can be disposed between the first core layer 44 and the second core layer 45.
• the third adhesive layer 50 can contain any of the compositions or attributes, such as thickness as described above in relation to the first and second adhesive layers 20, 30. In other embodiments, the third adhesive layer 50 can be different from the first and/or second adhesive layers 20, 30.
• the third adhesive layer 50 can have a thickness in a range of from about 0.01 mm to about 0.5 mm, from about 0.04 mm to about 0.35 mm, from about 0.05 mm to about 0.2 mm, or even from about 0.06 mm to about 0.1 mm.
• the third adhesive layer 50 can include an adhesive that loses adhesive strength when heated, such as a hot-melt adhesive.
• the adhered article can be heated when separation is desired, thereby lowering the adhesive strength of the third adhesive layer 50 such that the adhesive tape internally delaminates at the interface with or within the third adhesive layer 50 when the adhered components are separated.
• the third adhesive layer 50 can have at least one difference in composition or structure from the first or second adhesive layers 20,30.
• the third adhesive layer 50 can have a lower adhesive strength than the first adhesive layer 20.
• the third adhesive layer 50 can have a lower adhesive strength than the second adhesive layer 30.
• the third adhesive layer 50 can have a lower adhesive strength than the first adhesive layer 20 and a lower adhesive strength than the second adhesive layer 30.
• a ratio of adhesive strength of the third adhesive layer 50 to the second adhesive layer 30 can be in a range of from about 0.01 to about 0.99, from about 0.1 to 0.9, or even from about 0.25 to 0.75.
• a ratio of adhesive strength of the third adhesive layer 50 to the first adhesive layer 20 can be in a range of from about 0.01 to about 0.99, from about 0.1 to 0.9, or even from about 0.25 to 0.75.
• Each of the core layers composing the core 40 comprises a given material.
• Each of the core layers can comprise the same material or a different material than an other core layer.
• each of the core layers can comprise a foam-based core layer, a film- based core layer, an adhesive-based core layer, or any combination thereof.
• the first core layer 42, 44 and the second core layer 43, 45 can both include a foam-based core layer.
• one or more of the core layers can be a foam-based core layer.
• the foam-based core layer can be based on a polymer foam material.
• a suitable polymer foam material can include a polyacrylic foam, a polyurethane (PU) foam, a polyethylene (PE) foam, a polyvinyl chloride (PVC) foam, an EPDM foam, a polypropylene (PP) foam, or combinations thereof.
• PU polyurethane
• PE polyethylene
• PVC polyvinyl chloride
• EPDM foam polypropylene
• the core 40 can comprise at least one core layer that contains a PU foam material.
• a polymer foam layer can be formed from a multitude of different techniques.
• a foam layer can be formed by incorporating expandable microspheres within the base polymer reaction constituents as is well understood in the art.
• Further techniques for forming a foam material can include chemical or mechanical techniques, such as frothing. Any of the above techniques can be used to form a foam based layer according to the broadest embodiments of the present disclosure.
• a foam-based core layer can be formed by employing expandable microspheres.
• the expandable microspheres can be present in a foam layer in a particular concentration.
• the expandable microspheres can be present in a foam layer in a concentration in a range of at least about 0.5 wt.%, at least about 1 wt.%, or even at least about 3 wt.% based on the total weight of the foam layer.
• the expandable microspheres can be present in a foam layer in a concentration in a range of no greater than about 60 wt.%, no greater than about 50 wt.%, or even no greater than about 45 wt.% based on the total weight of the foam layer.
• the expandable microspheres can be present in a foam layer in a concentration in a range of any of the minimums and maximums provided above, such as in a range of from about 1 wt.% to about 50 wt.%, from about 2 wt.% to about 45 wt.%, or even from about 3 wt.% to about 40 wt.% based on the total weight of the foam layer.
• the adhesive characteristics of the foamed layer can be adjusted depending on the desired application.
• the concentration of the microspheres can be adjusted to influence the adhesive characteristics of the foamed layer.
• the concentration of the microspheres can be adjusted within the concentration ranges discussed above.
• the foamed layer can include adhesion modifiers such as matting powders, organic fillers, inorganic fillers, or any combination thereof.
• the matting powder can be an SiO 2 powder
• the organic filler can include an acrylic microsphere
• the inorganic filler can include an Al 2 O 3 .
• the two foam-based core layers can comprise the same concentration of microspheres, or different concentrations of microspheres and, thus, exhibit different adhesive strengths.
• the difference in the wt.% concentration of microspheres between the first foam based core layer and the second foam based core layer can be at least about 1 wt.%, at least about 3 wt.%, at least about 5 wt.%, or even at least about 10 wt.%.
• the core 40 can include one or more core layers other than a foam based core layer.
• the core 40 can comprise a first core layer 46 comprising a foam-based core layer and a second core layer 47 comprising a film-based core layer.
• the core can comprises a first core layer 48 comprising a foam-based core layer and a second core layer 49 comprising a film-based core layer, where the first core layer 48 and a the second core layer 49 are separated by a third adhesive 50.
• a third adhesive 50 it is to be understood that fewer, additional, or different layers or layer sequencing than is illustrated in FIGs. 3 and 4 can be employed within the scope of the present disclosure, and that the adhesive tapes illustrated in FIGs. 3 and 4 are only exemplary embodiments.
• a film-based core layer can include a polyurethane film, a polyethylene film, polyolefin film, polypropylene film or combinations thereof.
• a film-based core layer can include a polyurethane film.
• a foam-based core layer generally has a thickness that is greater than a film-based core layer.
• a foam-based core layer can have a thickness of at least about 0.05 mm, at least about 0.08 mm, or even at least about 0.1 mm.
• a foam-based core layer can have a thickness of no greater than about 2.5 mm, no greater than about 2 mm, no greater than about 1.5 mm, or even no greater than about 1.3 mm.
• a foam-based core layer can have a thickness in a range of any of the minimums and maximums provided above, such as in a range of from about 0.08 mm to about 2 mm, or even from about 0.1 mm to about 1.5 mm.
• a film-based core layer can have a thickness in a range of from about 0.005mm to about 1mm.
• the film-based core layer can have a lower thickness than the foam-based core layer.
• a ratio of the thickness of the foam core layer to the film core layer can be in a range of from about 1:0.01 to about 1:0.99, in a range of from about 1:0.1 to about 1:0.9, or even in a range of from about 1:0.25 to 1:0.75.
• the core 40 can have an elongation measured according to ASTM D412.
• the core 40 can have an elongation of at least about 200%, at least about 300%, at least about 400%, at least about 500%, or even at least about 600%.
• the core 40 can have an elongation of no greater than about 2500%, no greater than about 2200%, no greater than about 2000%, no greater than about 1800%, or even no greater than about 1700%.
• the core 40 can have an elongation in a range of any of the minimums and maximums provided above, such as in a range of from about 200% to about 2500%, in a range of from about 400% to about 2000%, or even in a range of from about 600% to about 1700%.
• the individual core layers can have an elongation measured according to ASTM D412.
• a foam based core layer can have an elongation of any of the values provided above for the core 40 as a whole.
• the first foam-based core layer 44 and the second foam- based core layer 45 can each have an elongation in a range of from about 200% to about 2500%, in a range of from about 400% to about 2000%, or even in a range of from about 600% to about 1700%.
• the adhesive tape as a whole can have an elongation measured according to ASTM D412.
• the adhesive tape as a whole can have an elongation of any of the minimums, maximums, or ranges provided above with respect to the core 40.
• the adhesive tape as a whole can have an elongation in a range of from about 200% to about 2500%, in a range of from about 400% to about 2000%, or even in a range of from about 600% to about 1700%.
• a particular advantage of certain embodiments of the present disclosure is employing at least one core layer and a core as a whole having the recited elongation to aid in obtaining essentially residue free removal from at least one and in certain embodiments both of the components to which the adhesive tape was adhered after initial separation of the components.
• the first and second core layers can have an elongation sufficient to allow stretching of the core layer (and any attached adhesive layer or film layer) at an angle of no greater than 35 degrees in relation to the surface of the component to which it is adhered and debond the core layer and adhesive layer while leaving essentially no adhesive residue on the component.
• Such constructions can also be referred to herein as“stretch removable.”
• the first adhesive layer can be adhered to a first component and the second adhesive layer can be adhered to a second component.
• the first component 60 can be separated from the second component 62. Due to the lower adhesive strength between the core layer, the first core layer 42 is separated from the second core layer 43 before the first and second adhesive layers 20, 30 are separated from the first and second components 60, 62.
• the first core layer 42 and the first adhesive layer 20 can be adapted to be stretched at an angle of no greater than about 35 degrees from the surface of the first component 60 to remove the first core layer 42 and the first adhesive layer 20 such that the first component 60 is essentially free of adhesive residue from the first adhesive layer after stretching.
• the second core layer and the second adhesive layer can be adapted to be stretched at an angle of no greater than about 35 degrees from the surface of the second component to remove the second core layer and the second adhesive layer such that the second component is essentially free of adhesive residue from the second adhesive layer after stretching.
• the core layer can contain a first core layer and a second core layer that has essentially the same composition as the first core layer.
• both the first and the second core layers 42, 43 can be foam-based core layers, and further can both be polyurethane foam-based core layers.
• the core can contain a first core layer that is formed from essentially the same polymer, but is in a different form.
• the first core layer 46 can contain a foam-based layer and the second core layer 47 can contain a film-based layer that is formed from the same base polymer as the foam-based layer.
• the first core layer can be a polyurethane foam-based layer
• the second core layer can be a polyurethane film-based layer.
• the core layer can contain a first core layer that is formed from a different type of base polymer from the second core layer.
• the first core layer 48 can be a foam-based layer and the second core layer 49 can be a film-based layer as described above.
• both the first and the second core layers 44, 45 can be foam based layers, but the first core layer can have a different type of base polymer.
• the first core layer can be a polyurethane foam- based layer and the second core layer can be a polyethylene foam-based layer.
• the tape as a whole can have a thickness measured from the outer surface of the first adhesive layer to the outer surface of the second adhesive layer.
• the tape as a whole can have a thickness of at least about 0.1 mm, at least about 0.18 mm, or even at least about 0.2 mm.
• the adhesive tape can have a total thickness of no greater than about 8 mm, no greater than about 6 mm, no greater than about 5 mm, or even no greater than about 4.2 mm.
• the adhesive tape can have a total thickness in a range of any of the minimums and maximums provided above, such as in a range of from about 0.1 mm to about 5 mm, or even from about 0.1 mm to about 4.2 mm.
• the tape can be adapted to internally delaminate, such as delaminate within the core when being separated from two components adhered together via the adhesive tape.
• the tape can be adapted to delaminate at the interface between the first core layer and the second core layer when separating the tape from opposing major surfaces.
• the core layers can have a particular bonding strength.
• the bonding strength between the first and second core layers can be less than the adhesive strength of the first adhesive layer.
• the bonding strength between the first and second core layers can be less than the adhesive strength of the second adhesive layer.
• the bonding strength between the first and second core layers can be less than the adhesive strength of the first adhesive layer and be less than the adhesive strength of the second adhesive layer.
• the bonding strength between the first core layer and the second core layer can be at least about 0.1 N/cm, at least about 0.2 N/cm, at least about 1 N/cm, or even at least about 3 N/cm as measured according to ASTM D1000. In further embodiments, the bonding strength between the first core layer and the second core layer may be no greater than about 50 N/cm, no greater than about 40 N/cm, no greater than about 30 N/cm, no greater than about 25 N/cm, or even no greater than about 20 N/cm as measured according to ASTM D1000.
• the bonding strength between the first core layer and the second core layer can be in a range of any of the above minimum or maximum values, such as in a range of from about 0.2 N/cm to about 20 N/cm as measured according to ASTM D1000.
• a ratio of the bonding strength between the first and second core layers to the adhesive strength of the first adhesive layer can be in a range of from about 0.01 to about 0.99, in a range of from about 1:0.1 to about 1:0.9, or even in a range of from about 1:0.25 to 1:0.75.
• a ratio of the bonding strength between the first and second core layers to the adhesive strength of the second adhesive layer can be in a range of from about 0.01 to about 0.99, in a range of from about 1:0.1 to about 1:0.9, or even in a range of from about 1:0.25 to 1:0.75.
• a ratio of the bonding strength between the first and second core layers to the adhesive strength of the first adhesive layer can be in a range of from about 0.01 to about 0.99, in a range of from about 1:0.1 to about 1:0.9, or even in a range of from about 1:0.25 to 1:0.75, and a ratio of the bonding strength between the first and second core layers to the adhesive strength of the second adhesive layer can be in a range of from about 0.01 to about 0.99, in a range of from about 1:0.1 to about 1:0.9, or even in a range of from about 1:0.25 to 1:0.75.
• Another aspect of the present disclosure is directed to an article comprising a first component and a second component adhered together via an adhesive tape as illustrated in FIG. 5.
• the adhesive tape can be any embodiment of the adhesive tape described herein and it is to be understood that any of the disclosure herein directed to the tape, or the methods of making and using the tape apply equally to embodiments directed to an article as described above.
• the first component can be a housing and the second component can be a panel.
• the first component can be a housing or a frame from a mobile phone
• the second component can be a panel, such as a screen panel for a mobile phone.
• the article can include components of a mobile phone.
• Yet another aspect of the present disclosure is directed to a method of forming an adhesive tape according to any of the embodiments described herein.
• a method of forming an adhesive tape can include: a. providing a first core layer;
• the bonding strength between the first core layer and the second core layer can be less than a bonding strength of the first adhesive layer and the second adhesive layer such that the adhesive tape can internally delaminate within the core when separated.
• the method can further include providing a third adhesive layer between the first core layer and the second core layer.
• the third adhesive layer can include a hot-melt adhesive layer such that the tape is adapted to internally delaminate at the interface with the hot-melt adhesive upon application of an effective amount of heat and pulling apart adhered components with an effective amount of force.
• Yet another aspect of the present disclosure is directed to a method of adhering two components via an adhesive tape according to any of the embodiments described herein.
• the method can include:
• the adhesive tape can be adapted to delaminate at the interface between the first core layer and the second core layer when the first component is separated from the second component.
• Still yet another aspect of the present disclosure is directed to a method of releasing two components adhered together via an adhesive tape according to any of the embodiments described herein.
• the method can include providing an article comprising a first component and a second component adhered together via an adhesive tape; and separating the first component from the second component thereby leaving a first adhesive layer and a first portion of the core on the first component and leaving a second adhesive layer and a second portion of the core on the second component.
• the method can further include removing the first portion of the core and first adhesive layer by stretching the first portion of the core and the first adhesive layer such that the first component is essentially free of adhesive residue from the first adhesive layer.
• the core layer can have an advantageous elongation to allow the core layer to stretch at an angle of no greater than 35 degrees from the surface of the component to which it is adhered without breaking.
• an advantageous elongation to allow the core layer to stretch at an angle of no greater than 35 degrees from the surface of the component to which it is adhered without breaking.
• the method can further include removing the second portion of the core and the first adhesive layer by stretching the second portion of the core and the first adhesive layer such that the second component is essentially free of adhesive residue from the second adhesive layer.
• Embodiment 1 A double sided adhesive tape comprising:
• a core comprising at least two core layers
• first and second adhesive layers forming outer major surfaces of the tape, wherein a bonding strength between the at least two core layers is less than the adhesive strength of the first adhesive layer and less than the adhesive strength of the second adhesive layer.
• Embodiment 2 A double sided adhesive tape comprising:
• a core comprising at least one foam-based core layer
• the tape is adapted to internally delaminate within the core without stretching when separating a first component and a second component adhered via the tape.
• Embodiment 3 A double sided adhesive tape comprising:
• a core comprising at least one foam-based core layer
• a double sided adhesive tape comprising:
• a core comprising a first foam-based core layer and a second foam-based core layer that is distinct from the first foam-based core layer
• first foam based core layer is directly adjacent and contacting the second foam based core layer
• the tape is adapted to internally delaminate between the first foam-based core layer and the second foam-based core layer when separating a first component and a second component adhered via the tape.
• An adhesive tape comprising:
• a core comprising:
• first core layer disposed adjacent the first adhesive layer; and a second core layer disposed adjacent the first core layer;
• a second adhesive layer disposed adjacent the second core layer and forming a second outer major surface of the tape
• adhesion strength between the first core layer and the second core layer is less than the adhesion strength of the first adhesive layer and less than the adhesion strength of the second adhesive layer.
• Embodiment 6 An adhesive tape adapted to adhere a first component to a second component
• adhesive tape comprises:
• a core comprising:
• first core layer disposed adjacent the first adhesive layer; and a second core layer disposed adjacent the first core layer; and a second adhesive layer disposed adjacent the second core layer and forming a second outer major surface of the tape;
• the adhesive tape is adapted to delaminate between the first core layer and the second core layer before delamination between the first adhesive layer and the first core layer, and before delamination between the second adhesive layer and the second core layer when the first component and the second component at both sides of the tape is pulled apart, such that when the first component is separated from the second component that has been adhered together with the adhesive tape, the first adhesive layer and the first core layer remain on the first component and the second adhesive layer and the second core layer remain on the second component.
• Embodiment 7 The adhesive tape of embodiment 6, wherein the first core layer and the first adhesive layer that remains on the first component after separation are adapted to be removable while leaving essentially no residue by stretching the first core layer at an angle of no greater than 35 degrees relative to the surface of the first component.
• Embodiment 8 The adhesive tape of embodiment 6 or 7, wherein the second core layer and the second adhesive layer that remains on the second component after separation are adapted to be removable while leaving essentially no residue by stretching the second core layer at an angle of no greater than 35 degrees relative to the surface of the second component.
• Embodiment 9 An adhesive tape comprising:
• a core comprising:
• first core layer disposed adjacent the first adhesive layer; and a first film core layer disposed adjacent the first core layer; and a second adhesive layer forming a second outer major surface of the tape, wherein the bonding strength between the first core layer and the first film layer is less than the bonding strength of the first and second adhesive layers.
• Embodiment 10 The adhesive tape of embodiment 9, wherein the adhesive tape further comprises a third adhesive layer disposed between the first film and the first core layer.
• Embodiment 11 A method of forming an adhesive tape, the method comprising: providing a first core layer;
• the bonding strength between the first core layer and the second core layer is less than a bonding strength of the first adhesive layer and the second adhesive layer.
• Embodiment 12 A method of adhering two components via an adhesive tape, the method comprising:
• Embodiment 13 A method of separating two components adhered together via an adhesive tape, the method comprising:
• Embodiment 14 The adhesive tape, article, or method of any one of the preceding embodiments, wherein the first core layer and/or the second core layer comprise a polyurethane (PU) foam, a polyethylene (PE) foam, a polyvinyl chloride (PVC) foam, an EPDM foam, a polypropylene (PP) foam, or combinations thereof.
• PU polyurethane
• PE polyethylene
• PVC polyvinyl chloride
• EPDM foam a polypropylene (PP) foam
• PP polypropylene
• Embodiment 15 The adhesive tape, article, or method of any one of the preceding embodiments, wherein the first core layer and/or the second core layer comprise a polyurethane (PU) foam.
• PU polyurethane
• Embodiment 16 The adhesive tape, article, or method of any one of the preceding embodiments, wherein the first core layer and/or the second core layer comprise a foam having an elongation in a range of from about 400% to about 1700% as measured according to ASTM D412.
• Embodiment 17 The adhesive tape, article, or method of any one of the preceding embodiments, wherein the first core layer and/or the second core layer comprises a plurality of microspheres.
• Embodiment 18 The adhesive tape, article, or method of any one of the preceding embodiments, wherein the first core layer and/or the second core layer comprises a plurality of microspheres in a concentration of at least about 0.5 wt.%, at least about 1 wt.%, or even at least about 3 wt.%.
• Embodiment 19 The adhesive tape, article, or method of any one of the preceding embodiments, wherein the first core layer and/or the second core layer comprises a plurality of microspheres in a concentration of no greater than about 60 wt.%, no greater than about 50 wt.%, or even no greater than about 45 wt.%.
• Embodiment 20 The adhesive tape, article, or method of any one of the preceding embodiments, wherein the first core layer and/or the second core layer comprises a plurality of microspheres in a concentration in a range of from 1 wt.% to about 50 wt.%.
• Embodiment 21 The adhesive tape, article, or method of any one of the preceding embodiments, wherein the first core layer has a different concentration of microspheres than the second core layer.
• Embodiment 22 The adhesive tape, article, or method of any one of the preceding embodiments, wherein the first core layer has a difference in concentration of microspheres than the second core layer of at least about 1 wt.%, at least about 3 wt.%, at least about 5 wt.%, or even at least about 10 wt.%.
• Embodiment 23 The adhesive tape, article, or method of any one of the preceding embodiments, wherein the first core layer and/or the second core layer comprises a matting powder, an organic filler, an inorganic filler, or any combination thereof.
• Embodiment 24 The adhesive tape, article, or method of any one of the preceding embodiments, wherein the first core layer and/or the second core layer have a thickness of at least about 0.05 mm, at least about 0.08 mm, or even at least about 0.1 mm.
• Embodiment 25 The adhesive tape, article, or method of any one of the preceding embodiments, wherein the first core layer and/or the second core layer have a thickness of no greater than about 2.5 mm, no greater than about 2 mm, no greater than about 1.5 mm, or even no greater than about 1.3 mm.
• Embodiment 26 The adhesive tape, article, or method of any one of the preceding embodiments, wherein the first core layer and/or the second core layer have a thickness in a range of from about 0.08 mm to about 2 mm, or even from about 0.1 mm to about 1.5 mm.
• Embodiment 27 The adhesive tape, article, or method of any one of the preceding embodiments, wherein the first core layer has essentially the same composition as the second core layer.
• Embodiment 28 The adhesive tape, article, or method of any one of the preceding embodiments, wherein the first core layer has a different composition from the second core layer.
• Embodiment 29 The adhesive tape, article, or method of any one of the preceding embodiments, wherein the first core layer has essentially the same thickness as the second core layer.
• Embodiment 30 The adhesive tape, article, or method of any one of the preceding embodiments, wherein the first core layer has a different thickness than the second core layer.
• Embodiment 31 The method of any one of the preceding embodiments, wherein the method comprises adjusting the bonding strength of interface between the first core layer and the second core layer such that the bonding strength is lower than the adhesive strength of the first adhesive layer and lower than the adhesive strength of the second adhesive layer.
• Embodiment 32 The method of any one of the preceding embodiments, wherein adjusting the bonding strength of the interface comprises adjusting the respective contents of microspheres in first and/or second core layers.
• Embodiment 33 The adhesive tape, article, or method of any one of the preceding embodiments, wherein the first adhesive layer and/or the second adhesive layer comprise a rubber base pressure sensitive adhesive, an acrylic base pressure sensitive adhesive, a silicone base pressure sensitive adhesive, a polyurethane base pressure sensitive adhesive, a hot-melt pressure sensitive adhesive or combinations thereof.
• Embodiment 34 The adhesive tape, article, or method of any one of the preceding embodiments, wherein the first adhesive layer and/or the second adhesive layer comprise a rubber base pressure sensitive adhesive, an acrylic base pressure sensitive adhesive, or combinations thereof.
• Embodiment 35 The adhesive tape, article, or method of any one of the preceding embodiments, wherein the first adhesive layer and/or the second adhesive layer have a thickness in a range of from about 10 microns to about 80 microns, or even from about 30 microns to about 60 microns.
• Embodiment 36 The adhesive tape, article, or method of any one of the preceding embodiments, wherein the adhesive tape comprises a first core layer and a first film layer disposed adjacent the first core layer.
• Embodiment 37 The adhesive tape, article, or method of any one of the preceding embodiments, wherein the first film layer comprises a polyurethane film, a polyethylene film, or combinations thereof.
• Embodiment 38 The adhesive tape, article, or method of any one of the preceding embodiments, wherein the first film layer comprises the same base material as the first core layer.
• Embodiment 39 The adhesive tape, article, or method of any one of the preceding embodiments, wherein the first film layer comprises the same base material as the first core layer and wherein the first film layer is directly contacting the first core layer.
• Embodiment 40 The adhesive tape, article, or method of any one of the preceding embodiments, wherein the adhesive tape comprises a third adhesive layer disposed between the first core layer and the second core layer.
• Embodiment 41 The adhesive tape, article, or method of any one of the preceding embodiments, wherein the third adhesive layer comprises a rubber base pressure sensitive adhesive, an acrylic base pressure sensitive adhesive, a silicone base pressure sensitive adhesive, a polyurethane base pressure sensitive adhesive, a hot-melt pressure sensitive adhesive, a hot-melt adhesive, or combinations thereof.
• the third adhesive layer comprises a rubber base pressure sensitive adhesive, an acrylic base pressure sensitive adhesive, a silicone base pressure sensitive adhesive, a polyurethane base pressure sensitive adhesive, a hot-melt pressure sensitive adhesive, a hot-melt adhesive, or combinations thereof.
• Embodiment 42 The adhesive tape, article, or method of any one of the preceding embodiments, wherein the third adhesive layer comprises a hot-melt adhesive, such as a pressure-sensitive hot-melt adhesive.
• a hot-melt adhesive such as a pressure-sensitive hot-melt adhesive.
• Embodiment 43 The adhesive tape, article, or method of any one of the preceding embodiments, wherein the third adhesive layer has a thickness in a range of from about 0.01 mm to about 0.5 mm, from about 0.04 mm to about 0.35 mm, from about 0.05 mm to about 0.2 mm, or even from about 0.06 mm to about 0.1 mm.
• Embodiment 44 The adhesive tape, article, or method of any one of the preceding embodiments, wherein the first film layer comprises a different base material than the first core layer and wherein the third adhesive layer is directly contacting the first film layer and the first core layer.
• Embodiment 45 The adhesive tape, article, or method of any one of the preceding embodiments, wherein the adhesive strength between the first film layer and the first core layer is less than the adhesive strength of the first adhesive layer.
• Embodiment 46 The adhesive tape, article, or method of any one of the preceding embodiments, wherein the adhesive strength between the first film layer and the first core layer is less than the adhesive strength of the second adhesive layer.
• Embodiment 47 The adhesive tape, article, or method of any one of the preceding embodiments, wherein the adhesive tape has a total thickness of at least about 0.1 mm, at least about 0.18 mm, or even at least about 0.2 mm.
• Embodiment 48 The adhesive tape, article, or method of any one of the preceding embodiments, wherein the adhesive tape has a total thickness of no greater than about 8 mm, no greater than about 6 mm, no greater than about 5 mm, or even no greater than about 4.2 mm.
• Embodiment 49 The adhesive tape, article, or method of any one of the preceding embodiments, wherein the adhesive tape has a total thickness in a range of from about 0.1 mm to about 5 mm, or even from about 0.1 mm to about 4.2 mm.
• Embodiment 50 The adhesive tape, article, or method of any one of the preceding embodiments, wherein the adhesive tape is adapted to internally delaminate.
• Embodiment 51 The adhesive tape, article, or method of any one of the preceding embodiments, wherein the adhesive tape is adapted to internally delaminate within the core of the adhesive tape.
• Embodiment 52 The method of any one of the preceding embodiments, wherein the method comprises removing the first adhesive layer and the first core layer from the first component by stretching at an angle of no greater than about 35 degrees from the surface of the first component such that the first component is essentially free of adhesive residue from the first adhesive layer.
• Embodiment 53 The method of any one of the preceding embodiments, wherein the method comprises removing the second adhesive layer and the second core layer from the second component by stretching at an angle of no greater than about 35 degrees from the surface of the second component such that the second component is essentially free of adhesive residue from the second adhesive layer once the tape is fully stretched.
• Embodiment 54 The method of any one of the preceding embodiments, wherein the method comprises pulling apart the first component and the second component without stretching.
• Embodiment 55 The method of any one of the preceding embodiments, wherein the method comprises pulling apart the first component and the second component with an effective amount of force; and applying an effective amount of heat to internally delaminate the adhesive tape within the core.
• Embodiment 56 The method of any one of the preceding embodiments, wherein the adhesive tape comprises a hot-melt adhesive layer, wherein the method comprises pulling apart the first component and the second component with an effective amount of force; and applying an effective amount of heat to internally delaminate the adhesive tape at an interface with the hot-melt adhesive.
• Embodiment 57 The adhesive tape, article, or method of any one of the preceding embodiments, wherein a bonding strength between the first core layer and the second core layer is at least about 0.1 N/cm, at least about 0.2 N/cm, at least about 1 N/cm, or even at least about 3 N/cm as measured according to ASTM D1000.
• Embodiment 58 The adhesive tape, article, or method of any one of the preceding embodiments, wherein a bonding strength between the first core layer and the second core layer is no greater than about 50 N/cm, no greater than about 40 N/cm, no greater than about 30 N/cm, no greater than about 25 N/cm, or even no greater than about 20 N/cm as measured according to ASTM D1000.
• Embodiment 59 The adhesive tape, article, or method of any one of the preceding embodiments, wherein a bonding strength between the first core layer and the second core layer is in a range of from about 0.2 N/cm to about 20 N/cm as measured according to ASTM D1000.
• Embodiment 60 The adhesive tape, article, or method of any one of the preceding embodiments, wherein a bonding strength between the first core layer and the second core layer is less than the bonding strength of the first adhesive layer.
• Embodiment 61 The adhesive tape, article, or method of any one of the preceding embodiments, wherein a bonding strength between the first core layer and the second core layer is less than the bonding strength of the second adhesive layer.
• Embodiment 62 The adhesive tape, article, or method of any one of the preceding embodiments, wherein a bonding strength between the first core layer and the second core layer is less than the bonding strength of the first adhesive layer and is less than the bonding strength of the second adhesive layer.
• Embodiment 63 The adhesive tape, article, or method of any one of the preceding embodiments, wherein a ratio of the bonding strength between the first and second core layers and the bonding strength of the first adhesive layer is in a range of from about 0.01 to 0.99, or even from about 0.05 to about 0.95, or even from about 0.1 to about 0.9.
• Embodiment 64 The adhesive tape, article, or method of any one of the preceding embodiments, wherein a ratio of the bonding strength between the first and second core layers and the bonding strength of the second adhesive layer is in a range of from about 0.01 to 0.99, or even from about 0.05 to about 0.95, or even from about 0.1 to about 0.9.
• Embodiment 65 The adhesive tape, article, or method of any one of the preceding embodiments, wherein the adhesive tape has an elongation of at least about 200%, at least about 300%, at least about 400%, at least about 500%, or even at least about 600% as measured according to ASTM D412.
• Embodiment 66 The adhesive tape, article, or method of any one of the preceding embodiments, wherein the adhesive tape has an elongation of no greater than about 2500%, no greater than about 2200%, no greater than about 2000%, no greater than about 1800%, or even no greater than about 1700% as measured according to ASTM D412.
• Embodiment 67 The adhesive tape, article, or method of any one of the preceding embodiments, wherein the adhesive tape has an elongation in a range of from about 400% to about 1700% as measured according to ASTM D412.
• Embodiment 68 The adhesive tape, article, or method of any one of the preceding embodiments, wherein the first core layer and/or the second core layer has an elongation of at least about 200%, at least about 300%, at least about 400%, at least about 500%, or even at least about 600% as measured according to ASTM D412.
• Embodiment 69 The adhesive tape, article, or method of any one of the preceding embodiments, wherein the first core layer and/or the second core layer has an elongation of no greater than about 2500%, no greater than about 2200%, no greater than about 2000%, no greater than about 1800%, or even no greater than about 1700% as measured according to ASTM D412.
• Embodiment 70 The adhesive tape, article, or method of any one of the preceding embodiments, wherein the first core layer and/or the second core layer has an elongation in a range of from about 400% to about 1700% as measured according to ASTM D412.
• Embodiment 71 An article comprising:
• an adhesive tape disposed between and adhering the first and second components, wherein the adhesive tape comprises the adhesive tape of any one of the preceding embodiments.
• Embodiment 72 The article of any one of the preceding embodiments, wherein the article is adapted to be separated by pulling apart the first component and the second component to thereby internally delaminate the adhesive within the core.
• Embodiment 73 The article of any one of the preceding embodiments, wherein the adhesive tape comprises a hot-melt adhesive layer within the core, and wherein the article is adapted to be separated by pulling apart the first component and the second component while applying an effective amount of heat to the adhesive tape to thereby internally delaminate the adhesive tape at the interface with the hot-melt adhesive.
• Embodiment 74 A mobile phone comprising:
• an adhesive tape disposed between and adhering the screen to the housing, wherein the adhesive tape comprises the adhesive tape of any one of the preceding embodiments.
• Tensile adhesion tests were conducted on 24 samples with ambient conditions including a room temperature of approximately 25 degrees Celsius and a relative humidity of approximately 38%.
• Each test specimen included two cores of 0.3 mm thick polyurethane foam tape cut into 1 inch (about 2.5 cm) squares. Between the two cores was a layer of adhesive 0.08 mm thick. The 24 samples were divided into 8 groups of 3 samples each. Groups 1 to 4 included samples that used polyethersulfone, PES117, available from Rheo Technology Co., Ltd. at Shanghai, China, as the layer of adhesive. Groups 5 to 8 used thermoplastic polyurethane, TPU376, available from Rheo Technology Co., Ltd. at Shanghai, China, as the layer of adhesive.
• each sample was coated with a layer approximately 0.08 mm thick of an acrylic pressure sensitive adhesive, 77307, available from Eternal Chemical Co., Ltd.
• an acrylic pressure sensitive adhesive 77307, available from Eternal Chemical Co., Ltd.
• Each sample was placed between two T-shaped clamps with surface dimensions of 1 inch by 1inch (about 2.5 cm by about 2.5 cm).
• a pressure of 25 psi (170 kPa) was applied by each clamp for 15 seconds, after which the sample rested for 15 minutes.
• Each group was allowed to reach one of four temperatures before measuring the tensile adhesion of the cores.
• Groups 1 and 5 were allowed to reach 25 degrees Celsius
• Groups 2 and 6 were allowed to reach 90 degrees Celsius
• Groups 3 and 7 were allowed to reach 110 degrees Celsius
• Groups 4 and 8 were allowed to reach 130 degrees Celsius.
• Results of the tensile adhesion test for PES117 are presented in Table 1.
• Results of the tensile adhesion test for TPU376 are presented in Table 2.

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Citations (5)

• 2015
  • 2015-09-30 CN CN201510641096.4A patent/CN106554727A/zh active Pending
• 2016
  • 2016-09-29 WO PCT/US2016/054452 patent/WO2017059073A1/en active Application Filing

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