WO2021171258A1 - Dispositif électronique à élément amovible - Google Patents

Dispositif électronique à élément amovible Download PDF

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Publication number
WO2021171258A1
WO2021171258A1 PCT/IB2021/051638 IB2021051638W WO2021171258A1 WO 2021171258 A1 WO2021171258 A1 WO 2021171258A1 IB 2021051638 W IB2021051638 W IB 2021051638W WO 2021171258 A1 WO2021171258 A1 WO 2021171258A1
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WIPO (PCT)
Prior art keywords
electronic device
tackifier
psa
copolymer
layer
Prior art date
Application number
PCT/IB2021/051638
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English (en)
Inventor
Ross J. DEVOLDER
Ramasubramani KUDUVA RAMAN THANUMOORTHY
Jonathan J. ANDERSON
Sierra V. TRAINOR
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3M Innovative Properties Company
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Publication of WO2021171258A1 publication Critical patent/WO2021171258A1/fr

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Classifications

    • 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
    • C09J7/30—Adhesives in the form of films or foils characterised by the adhesive composition
    • C09J7/38—Pressure-sensitive adhesives [PSA]
    • C09J7/381—Pressure-sensitive adhesives [PSA] based on macromolecular compounds obtained by reactions involving only carbon-to-carbon unsaturated bonds
    • C09J7/387—Block-copolymers
    • 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
    • C09J7/30—Adhesives in the form of films or foils characterised by the adhesive composition
    • C09J7/38—Pressure-sensitive adhesives [PSA]
    • 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
    • C09J2425/00—Presence of styrenic polymer

Definitions

  • This disclosure relates to electronic devices having components, such as batteries, that are secured to the electronic device with thin, stretch-release double sided tape construction that include first and second pressure sensitive adhesive (PSA) layers borne on a support layer.
  • PSA pressure sensitive adhesive
  • Components, particularly batteries, in electronic devices such as smart phones, are typically held in place with adhesives or tapes.
  • adhesives or tapes are typically held in place with adhesives or tapes.
  • a battery from a smart phone may need to be replaced or removed for re-working during manufacturing.
  • point forces on the component for example, prying with a screwdriver or other lever
  • stretch release tapes are used by electronic device manufacturers to allow for subsequent de-bonding of, for example, a battery from a device’s chassis.
  • Such stretch-release tapes typically include a foam core with coatings of a pressure sensitive adhesive on both major surfaces.
  • stretch-release tapes suitable for electronics component bonding are their thickness.
  • To achieve harsh angle release that is, effective stretch release with tab pull angles at 60-90°), such tapes need to be relatively thick, to date at least 150pm.
  • Thinner stretch release tapes, which are demanded by the industry, have been unable to tolerate harsh release angles, and fail when subjected to harsh angles. The failure mode is typically that they break during elongation associated with the application of a pulling force on the tab, before stretch release is effected.
  • An electronic device having a component bonded to it with a very thin stretch release tape that effects stretch release of two bonded surfaces by application of a release force even at harsh angles typically required in component bonding applications within the portable electronic device arts. For example, battery bonding within smart phones.
  • harsh angles are angles between at least 60° and going up to and including 90° relative to the bond plane of the stretch release tape.
  • the very thin stretch release tapes of this disclosure are lOOpm in thickness or less.
  • Particular stretch tape constructions of present disclosure provides constructions comprise: a first pressure sensitive adhesive (PSA) layer; a support layer; and a second pressure sensitive adhesive (PSA) layer; wherein the support layer comprises: 55-95 wt% of an olefmic copolymer of ethylene and alpha-olefm(s) comprising 3-12 carbons; and 5-45 wt% of a first tackifier.
  • the support layer comprises: 55-100 wt% of an olefmic copolymer of ethylene and alpha-octene; and 0-45 wt% of a first tackifier.
  • the support layer comprises a first tackifier; the first PSA layer comprises a second tackifier; and the second PSA layer comprises a third tackifier; where the first, second, and third tackifiers are the same tackifier.
  • the first PSA layer comprises: 30-70 wt% of a first styrenic copolymer; and 30-70 wt% of a second tackifier.
  • the second PSA layer comprises: 30-70 wt% of a second styrenic copolymer; and 30-70 wt% of a third tackifier.
  • the first, second and third tackifiers may be identical or independently different, and in some embodiments are selected from terpene phenolic resins, terpenes, rosin esters, aliphatic-modified C5 to C9 hydrocarbons, aromatic- modified C5 to C9 hydrocarbons and hydrogenated C5 to C9 hydrocarbons. Additional embodiments of the constructions of the present disclosure are described below under “Selected Embodiments.”
  • bond plane refers to a flat, two-dimensional surface that is, on average, equidistant from two surfaces bonded together with a stretch release tape, separated only by the thickness of the stretch release tape.
  • pressure sensitive adhesive means materials having the following properties: a) tacky surface, b) the ability to adhere with no more than finger pressure, c) the ability to adhere without activation by any energy source, d) sufficient ability to hold onto the intended adherend, and preferably e) sufficient cohesive strength to be removed cleanly from the adherend; which materials typically meet the Dahlquist criterion of having a storage modulus at 1 Hz and room temperature of less than 0.3MPa; and
  • substituted means, for a chemical species, group or moiety, substituted by conventional substituents which do not interfere with the desired product or process, e.g., substituents can be alkyl, alkoxy, aryl, phenyl, halo (F, Cl, Br, I), cyano, nitro, etc.
  • Figure l is a length of stretch release tape.
  • Figure 2 is a length of stretch release tape on a test substrate.
  • Figure 3 is a profile view of an apparatus for testing a stretch release tape.
  • the present disclosure provides electronic devices, particularly handheld electronic devices that are quite thin, having components bonded together with a thin stretch release tape.
  • the stretch release tape may be stretch released at harsh angles (between about 60-90° from the bond plane of the stretch release tape).
  • Stretch release tapes of the prior art are not able to achieve this combination of thinness and harsh angle release.
  • Such constructions may be particularly useful for bonding batteries to the chassis of a smartphone, an application which requires an inexpensive, reliable, secure bond, but also may require subsequent debonding in a manner that does not damage the chassis or the battery.
  • Stretch-release adhesive tapes that have been discovered that are thin (lOOpm or less) and allow for harsh angle (60-90°) release comprise: a first pressure sensitive adhesive (PSA) layer; a support layer; and a second pressure sensitive adhesive (PSA) layer.
  • PSA pressure sensitive adhesive
  • the first and second PSA layers are typically borne on opposite faces of the support layer and directly bound to the support layer.
  • additional layers may be located between one or both PSA layers and the support layer, such as layers of adhesive primer, barrier layers, or foam layers.
  • Stretch release tapes advantageously are capable of high bond strength to adherends, but may be parted from an adherend by stretching.
  • the constructions of the present disclosure may be parted from the adherend by stretching not only in the direction of the bond plane, but also in directions at angles up to 60° or even up to 90° to the bond plane, without tape breakage and without leaving adhesive residue on either adherend.
  • the stretch release tape constructions according to the present disclosure may have a thickness of 50 to 2000 micrometers, more typically 75 to 1000 micrometers, and more typically 75 to 350 micrometers.
  • the support layer may have a thickness of 10 to 200 micrometers, more typically between 20 and 100 micrometers, and more typically between 25 and 60 micrometers.
  • the PSA layers may have a thickness of 10 to 200 micrometers, more typically between 20 and 100 micrometers, and more typically between 25 and 60 micrometers.
  • First and second PSA layers may comprise a styrenic copolymer and a tackifier, whose identities and relative amounts may be chosen independently for the first and second PSA layers or may be the same for both PSA layers.
  • the PSA layers may comprise 30-70 wt% of styrenic copolymer, in some such embodiments at least 35 wt% or 40%, and in some such embodiments less than 65 wt% or 60 wt%.
  • the PSA layers may comprise 30-70 wt% of tackifier, in some such embodiments at least 35 wt% or 40%, and in some such embodiments less than 65 wt% or 60 wt%.
  • Any suitable styrenic copolymer may be used in the first and second PSA layers.
  • a single species or type of styrenic copolymer may be used, or combinations of species or types of styrenic copolymer may be used as the styrenic copolymer.
  • Styrenic copolymers are copolymers of styrene and one or more unsaturated comonomer.
  • Styrene monomers may optionally include substituted styrenes, e.g., alpha-methyl styrene.
  • Comonomers may include singly unsaturated species and/or doubly unsaturated, e.g., 1,3-dienes such as butadiene or isoprene; ethylbutadiene, phenylbutadiene, piperylene, pentadiene, hexadiene, ethylhexadiene and dimethylhexadiene.
  • Comonomers may optionally be substituted.
  • the styrenic copolymers include styrenic block copolymers, in combination with other types or exclusively. Suitable styrenic block copolymers may include A-B block copolymers, A-B-A block copolymers, star block copolymers, and the like. In some embodiments the styrenic copolymers include styrenic random copolymers, in combination with other types or exclusively. In some embodiments the styrenic copolymers include styrene-butadiene-styrene (SBS) block copolymers. In some embodiments the styrenic copolymers include styrene-butadiene random (SBr) copolymers.
  • SBS styrene-butadiene-styrene
  • SBr styrene-butadiene random copolymers.
  • the first PSA layer, second PSA layer, or both may be syntactic or non-syntactic foam adhesive layers.
  • Syntactic foams are composite materials comprising a matrix and dispersed therein hollow structures such as expandable or expanded polymeric microspheres, microballoons, glass microspheres or other flexible- or rigid-walled hollow structures which establish pores within the matrix.
  • Syntactic foams may be generated by addition of hollow structures to the matrix material by any suitable means, including addition of hollow structures to the matrix while it is in a dissolved, melted, or pre-polymeric state.
  • Non-syntactic foams comprise a matrix having pores within the matrix bounded by the matrix material itself.
  • Non-syntactic foams may be generated by creation of pores within the matrix by any suitable means, including addition of physical or chemical blowing agents to the matrix while it is in a dissolved, melted, or pre-polymeric state.
  • the first PSA layer, second PSA layer, or both may hybrid syntactic/non-syntactic foams.
  • the support layer may comprise an olefmic polymer or copolymer and in some cases a tackifier.
  • the support layer may comprise 55-100 wt% of olefmic polymer or copolymer, in some embodiments 55-95 wt%, and in some embodiments less than 65 wt% or 60 wt% .
  • the PSA layers may comprise 0-45 wt% of tackifier, in some embodiments 5-45 wt%, and in some embodiments less than 65 wt% or 60 wt%.
  • any suitable olefmic polymer or copolymer may be used in the support layer.
  • the olefmic polymer or copolymer is a random copolymer.
  • the olefmic polymer or copolymer is a block copolymer.
  • the olefmic polymer or copolymer is the polymerization product of one or more monomers selected from ethylene, propylene, butylene, pentene, hexene, septene, octene, nonene, decene, undecene, or dodecene. Monomers may optionally be substituted.
  • the olefmic polymer or copolymer is an olefmic copolymer of ethylene and alpha-olefm(s) comprising 3-12 carbons.
  • the alpha-olefin is butylene.
  • the alpha- olefin is octene.
  • Any suitable tackifiers may be used in the various layers of constructions according to the present disclosure.
  • each tackifier is independently selected from terpene phenolic resins, terpenes, rosin esters, aliphatic- modified C5 to C9 hydrocarbons, aromatic-modified C5 to C9 hydrocarbons and hydrogenated C5 to C9 hydrocarbons.
  • Such tackifiers may include hydrogenated or non-hydrogenated polymers of dicyclopentadiene, non-hydrogenated, partly, selectively or fully hydrogenated hydrocarbon resins based on C5, C5/C9, or C9 monomer streams, polyterpene resins based on alpha-pinene and/or beta-pinene and/or delta-limonene.
  • useful tackifiers may be solids or liquids at standard temperature and pressure.
  • PSA layers and support layers may, independently, comprise suitable additives known in the art, which may include plasticizers, fillers, antioxidants, UV stabilizers, pigments, dyes, and the like.
  • Such electronic devices may include cameras, photography accessories (such as light meters, flash units, lenses, etc.), video cameras, computers or portable computers, calculators, laptops, notebooks, tablet computers, electronic diaries and organizers, modems, computer accessories, mice, drawing pads, graphics tablets, microphones, loudspeakers, gaming consoles, remote controls, touchpads, monitors, displays, screens, touch-sensitive screens, projectors, reading devices for electronic books, mini TV’s, pocket TV’s, devices for playing films, video players, radios, music players (such as for CD’s, DVD’s, cassettes, USB , MP3, etc.), headphones, cordless telephones, mobile phones, smart phones, two-way radios, hands-free telephones, pagers, beepers, mobile defibrillators, blood sugar meters, blood pressure monitors, step counters,
  • An electronic device comprising: a first component having a first major surface; a second component having a first major surface; a length of double-adhesive sided stretch release tape sandwiched between the first and second component, adhesively coupled to the first major surface of the first component and the first major surface of the second component along a bond plane; wherein the length of double-adhesive sided tape comprises a terminal tab portion which extends beyond the major surface of the first electronic component and may be pulled by at an angle between 60 and 90 degrees offset from the bond plane to effect stretchable release of the second component; and wherein the length of double-sided adhesive tape is less than about 100 pm.
  • the length of double adhesive-sided tape comprises: a. a first pressure sensitive adhesive (PSA) layer; b. a support layer; and c. a second pressure sensitive adhesive (PSA) layer; wherein the support layer comprises: i. 55-95 wt% of an olefmic copolymer of ethylene and alpha-olefm(s) comprising 3 12 carbons; and ii. 5-45 wt% of a first tackifier.
  • the first PSA layer comprises: i. 30-70 wt% of a first styrenic copolymer; and ii. 30-70 wt% of a second tackifier.
  • the second PSA layer comprises: i. 30-70 wt% of a second styrenic copolymer; and ii. 30-70 wt% of a third tackifier.
  • the first tackifier is selected from the group consisting of terpene phenolic resins, terpenes, rosin esters, aliphatic-modified C5 to C9 hydrocarbons, aromatic- modified C5 to C9 hydrocarbons and hydrogenated C5 to C9 hydrocarbons.
  • each tackifier is independently selected from the group consisting of terpene phenolic resins, terpenes, rosin esters, aliphatic-modified C5 to C9 hydrocarbons, aromatic- modified C5 to C9 hydrocarbons and hydrogenated C5 to C9 hydrocarbons.
  • A8 The electronic device according to any of embodiments A1-A6 wherein the alpha-olefin is octene.
  • A11 The electronic device according to any of the preceding embodiments wherein the first and second styrenic copolymers comprise styrene-butadiene-styrene (SBS) block copolymers.
  • SBS styrene-butadiene-styrene
  • a construction comprising: a. a first pressure sensitive adhesive (PSA) layer; b. a support layer; and c. a second pressure sensitive adhesive (PSA) layer; wherein the support layer comprises: i. 55-95 wt% of an olefmic copolymer of ethylene and alpha-olefm(s) comprising 3-12 carbons; and ii. 5-45 wt% of a first tackifier.
  • PSA pressure sensitive adhesive
  • PSA second pressure sensitive adhesive
  • first PSA layer comprises: i. 30-70 wt% of a first styrenic copolymer; and ii. 30-70 wt% of a second tackifier.
  • the second PSA layer comprises: i. 30-70 wt% of a second styrenic copolymer; and ii. 30-70 wt% of a third tackifier.
  • the first tackifier is selected from the group consisting of terpene phenolic resins, terpenes, rosin esters, aliphatic-modified C5 to C9 hydrocarbons, aromatic-modified C5 to C9 hydrocarbons and hydrogenated C5 to C9 hydrocarbons.
  • first, second, and third tackifiers are independently selected from the group consisting of terpene phenolic resins, terpenes, rosin esters, aliphatic-modified C5 to C9 hydrocarbons, aromatic-modified C5 to C9 hydrocarbons and hydrogenated C5 to C9 hydrocarbons.
  • first and second styrenic copolymers are styrene-butadiene-styrene (SBS) block copolymers.
  • a construction comprising: a. a first pressure sensitive adhesive (PSA) layer; b. a support layer; and c. a second pressure sensitive adhesive (PSA) layer; wherein the support layer comprises: i. 55-100 wt% of an olefmic copolymer of ethylene and alpha-octene; and ii. 0-45 wt% of a first tackifier.
  • PSA pressure sensitive adhesive
  • PSA second pressure sensitive adhesive
  • first PSA layer comprises: i. 30-70 wt% of a first styrenic copolymer; and ii. 30-70 wt% of a second tackifier.
  • E06 The construction according to any of embodiments E01-E05 wherein the first tackifier is selected from the group consisting of terpene phenolic resins, terpenes, rosin esters, aliphatic-modified C5 to C9 hydrocarbons, aromatic-modified C5 to C9 hydrocarbons and hydrogenated C5 to C9 hydrocarbons.
  • the first tackifier is selected from the group consisting of terpene phenolic resins, terpenes, rosin esters, aliphatic-modified C5 to C9 hydrocarbons, aromatic-modified C5 to C9 hydrocarbons and hydrogenated C5 to C9 hydrocarbons.
  • first, second, and third tackifiers are independently selected from the group consisting of terpene phenolic resins, terpenes, rosin esters, aliphatic-modified C5 to C9 hydrocarbons, aromatic-modified C5 to C9 hydrocarbons and hydrogenated C5 to C9 hydrocarbons.
  • EOl 1 The construction according to any of embodiments EOI-EOIO wherein the first and second styrenic copolymers are styrene-butadiene- styrene (SBS) block copolymers.
  • SBS styrene-butadiene- styrene
  • a construction comprising: a. a first pressure sensitive adhesive (PSA) layer; b. a support layer; and c. a second pressure sensitive adhesive (PSA) layer; wherein the support layer comprises a first tackifier; wherein the first PSA layer comprises a second tackifier; wherein the second PSA layer comprises a third tackifier; and wherein the first, second, and third tackifiers are the same tackifier.
  • PSA pressure sensitive adhesive
  • PSA pressure sensitive adhesive
  • X9 The construction according to any of embodiments XI -X8 wherein the first, second, and third tackifiers are selected from the group consisting of terpene phenolic resins, terpenes, rosin esters, aliphatic-modified C5 to C9 hydrocarbons, aromatic- modified C5 to C9 hydrocarbons and hydrogenated C5 to C9 hydrocarbons.
  • XI 0.
  • XI 1 The construction according to any of embodiments XI -X9 wherein the support layer additionally comprises 55-100 wt% of an olefmic copolymer of ethylene and alpha-olefm(s) comprising 3-12 carbons.
  • XI 6 The construction according to any of embodiments XI 1 -XI 5 wherein the first PSA layer is a foam adhesive layer.
  • XI 7 The construction according to any of embodiments XI 1 -XI 6 wherein the second PSA layer is a foam adhesive layer.
  • RPM revolutions per minute
  • kg kilograms
  • g grams
  • oz ounces
  • lb pounds
  • a jig was constructed to model conditions within an electronic device, for example a smart phone, approximating conditions associated with bonding a battery into the electronic device.
  • polyimide tape P5413 was bonded to a first major surface of a first SS Test Panel, with the polyimide face of the P5413 tape facing outward, forming a rigid polyimide surface 14 (in reference to FIG. 2), and wraping around a first edge (see FIG. 4).
  • a piece of P810 was then bonded face-down covering 0.635 cm from the edge of the rigid film surface (shown as element 15 in FIG. 2). Test strip 12 as described in association with FIG.
  • first SS Test Panel (element 32) is shown having polyimide tape 36 bonded thereto, creating rigid polyimide tape surface 14.
  • a 6 kg weight was applied to the bonded constructs for 15 seconds and the bonded article was allowed to dwell for 1 hour at 23°C and 50% relative humidity or 72 hours at 65°C and 90% relative humidity.
  • a pull tab of P8403 was bonded to the test strip 12.
  • the pull tab 16 was pulled at 60° or 90° angle, with respect to the bond plane at a rate of 304.8 mm/min (12 in/min), using a Sintech 500/S tensile tester (obtained from MTS, Eagan, MN). Tape samples that cleanly released from the bonded construct were indicated as such by being recorded as “Pass” and 100% Removed. For tape samples that did not stretch release and a bond remained, they were recorded as “Fail” and with a % Removed being determined by the length of de-bond tape relative to the initial bonding length at the point which the samples broke or failed was recorded.
  • Example, Comparative Example, and Commercially Available Comparative Example tape samples were prepared by slitting uniform test strips 12.7 mm x 127 mm (0.5 inches x 5 inches) in dimension from each adhesive tape sample prepared. Two replicates were prepared for each Example and Comparative Example tape sample.
  • the exposed adhesive surface of the tape sample strips were then adhered along the length of a stainless steel (SS) plate measuring 5.1 cm (2 inches) wide by 12.7 cm (5 inches) long by 0.12 cm (0.0472 inches) thick and rolled down 5 times with a 2.0 kg rubber roller.
  • the plate was cleaned prior to applying the tape sample by wiping with acetone once, then with heptane three times using a tissue paper.
  • the peel adhesion strength was evaluated using a Sintech 500/S tensile tester, (obtained from MTS, Eagan, MN), using a crosshead speed of 304.8 mm/min (12 in/min), at an angle of 180°, with the test tape sample held in the bottom clamp and the tail in the top clamp. The average of the two test tape samples was recorded in N/decimeter (N/dm). This number was reported as the “Peel on SS after 72 hrs RT Dwell”.
  • Melt stream Layer A was compounded using a 25 mm co-rotating twin screw extruder (obtained from Berstorff, Germany) having the composition found in Table 2. Melt stream Layer A was compounded with a 3.63 kg/hr (8 lb/hr) throughput. GP3566 was dry fed into the first zone of the 25 mm co-rotating twin screw extruder. Resin W10 was heated to 93.3°C (200°F) and fed into the fourth zone of the extruder using a gridmelter (obtained from Dynatec, Hendersonville, TN).
  • Resin A135 was heated to 176.7°C (350°F) and fed into the sixth zone of the extruder for using a gridmelter (obtained from Dynatec, Hendersonville, TN). EMS was fed into the eighth zone of the extruder, using a loss-in-weight feeder (obtained from Brabender, Germany).
  • Melt stream Layer B was compounded using an 18 mm co-rotating twin screw extruder (obtained from ThermoScientific, Waltham, MA) having the compositions found in Table 3. Melt stream Layer B was compounded with 1.81 kg/hr (4 lb/hr) throughput. All components, E8003, A135, W10, E8402, 19530, and/or EX9182, were fed into the first zone of the extruder and compounded.
  • Examples 1 - 6 were multilayer samples having a Layer A - Layer B - Layer A (ABA) construction.
  • the compounded melt stream Layer A was metered using a gear-pump (obtained from Colfax, Annapolis Junction, MD), and then evenly split into two melt streams, each having a throughput of 1.81 kg/hr (4 lb/hr).
  • Melt stream Layer B was metered using a gear-pump (obtained from Colfax, Annapolis Junction, MD). All extrudate melt streams were fed into a multi-layer feedblock (obtained from Nordson, Westlake, OH and/or Cloeren, Orange, TX) and were merged forming an ABA multilayer melt stream with layer combinations found in Table 4.
  • the ABA multilayer stream was passed through a single layer die (obtained from Nordson, Westlake, OH and/or Cloeren, Orange, TX) and cast onto Release Liner 1 with a 150 um (5.9 mil) thickness.
  • Comparative Example 1 was prepared using the same procedure as Examples 1-6 (E1-E6).
  • the compositions of melt stream Layer A and B are found in Table 2 and Table 3, respectively.
  • the layer throughputs and combination for Cl are found in Table 4.
  • Melt stream Layer A was compounded using a 25 mm co-rotating twin screw extruder (obtained from Berstorff, Germany) having the composition found in Table 5. Melt stream Layer A was compounded with a 3.63 kg/hr (8 lb/hr) throughput. GP3548, S1205C, E160, and W4048 were dry fed into the first zone of the 25 mm co-rotating twin screw extruder. Resin W10 was heated to 93.3°C (200°F) and fed into the fourth zone of the extruder for Layer A using a gridmelter (obtained from Dynatec, Hendersonville, TN).
  • Resin RE100L was heated to 176.7°C (320°F) and fed into the sixth zone of the extruder for Layer A using a gridmelter (obtained from Dynatec, Hendersonville, TN).
  • EMS were fed into the eighth zone of the extruder for Layer A, using a loss-in-weight feeder (obtained from Brabender, Germany).
  • Melt stream Layer B was compounded using an 18 mm co-rotating twin screw extruder (obtained from ThermoScientific, Waltham, MA) having the composition found in Table 6. Melt stream Layer B was compounded with a 2.27 kg/hr (5 lb/hr) or 3.18 kg/hr (7 lb/hr) throughput found in Table 6. All components, E8003 and E8402, were fed into the first zone of the extruder and compounded.
  • Examples 7-14 (E7-E14) were multilayer samples having a Layer A - Layer B
  • melt stream Layer A was metered using a gear-pump (obtained from Colfax, Annapolis Junction), and then evenly split into two melt streams, each having a throughput of 1.81 kg/hr (4 lb/hr).
  • Melt stream Layer B was metered using a gear-pump (obtained from Colfax, Annapolis Junction). All extrudate melt streams were fed into a multi-layer feedblock (obtained from
  • Examples 1-6 Examples 1-6 containing polyethylene-based elastomer resins in the core layer of an ABA multi-layer construction demonstrate the embodiments of the present disclosure providing for significantly improved stretch release performance, compared to the example containing a traditional thermoplastic resin of polyethylene. Additionally, the peel adhesion force demonstrates the applicability of these constructions for a variety of bonding solutions.
  • thin tape calipers are more susceptible to failure for stretch releasing at harsh angles; however, the polyethlene-based elastomer resins enable the successful stretch release of thin caliper tapes while maintaining acceptable bonding properties.
  • Table 9 Peel Adhesion and Stretch Release Measurements

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  • Adhesives Or Adhesive Processes (AREA)

Abstract

L'invention concerne un dispositif électronique muni d'une batterie ou un autre composant couplé à celui-ci avec une construction mince en bande détachable par étirement sous 100 µm. Des constructions en bandes qui peuvent être utiles en tant que bandes détachables par étirement comprennent : une première couche adhésive sensible à la pression (PSA) ; une couche de support ; et une seconde couche adhésive sensible à la pression (PSA) ; la couche de support comprenant : De 55 à 95 % en poids d'un copolymère oléfinique d'éthylène et d'alpha-oléfine(s) comprenant de 3 à 12 atomes de carbone ; et de 5 à 45 % en poids d'un premier agent poisseux. En variante, la couche de support comprend : De 55 à 100 % en poids d'un copolymère oléfinique d'éthylène et d'alpha-octène ; et de 0 à 45 % en poids d'un premier agent poisseux. En variante, la couche de support comprend un premier agent poisseux ; la première couche de PSA comprend un deuxième agent poisseux ; et la seconde couche de PSA comprend un troisième agent poisseux ; les premier, deuxième et troisième agents poisseux étant le même agent poisseux. Dans certains modes de réalisation, les première et seconde couches de PSA comprennent de 30 à 70 % en poids d'un copolymère styrénique et de 30 à 70 % en poids d'un agent poisseux.
PCT/IB2021/051638 2020-02-28 2021-02-26 Dispositif électronique à élément amovible WO2021171258A1 (fr)

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Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1992011332A1 (fr) 1990-12-20 1992-07-09 Minnesota Mining And Manufacturing Company Ruban adhesif decollable
US6103152A (en) 1998-07-31 2000-08-15 3M Innovative Properties Co. Articles that include a polymer foam and method for preparing same
US20090229732A1 (en) * 2008-03-14 2009-09-17 3M Innovative Properties Company Stretch releasable adhesive
US20150337177A1 (en) 2012-12-19 2015-11-26 Tesa Se Detachable adhesive strip
JP2017075228A (ja) * 2015-10-14 2017-04-20 日東電工株式会社 タブ付き粘着製品
US20180079937A1 (en) 2015-04-02 2018-03-22 Tesa Se Removable contact-adhesive tape
US20180112110A1 (en) 2015-04-02 2018-04-26 Tesa Se Removable pressure-sensitive adhesive strip
US20180148618A1 (en) 2016-11-30 2018-05-31 Tesa Se Redetachable adhesive strip

Patent Citations (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1992011332A1 (fr) 1990-12-20 1992-07-09 Minnesota Mining And Manufacturing Company Ruban adhesif decollable
US6103152A (en) 1998-07-31 2000-08-15 3M Innovative Properties Co. Articles that include a polymer foam and method for preparing same
US6797371B1 (en) 1998-07-31 2004-09-28 3M Innovative Properties Company Articles that include a polymer foam and method for preparing same
US20090229732A1 (en) * 2008-03-14 2009-09-17 3M Innovative Properties Company Stretch releasable adhesive
US20150337177A1 (en) 2012-12-19 2015-11-26 Tesa Se Detachable adhesive strip
US20180079937A1 (en) 2015-04-02 2018-03-22 Tesa Se Removable contact-adhesive tape
US20180112110A1 (en) 2015-04-02 2018-04-26 Tesa Se Removable pressure-sensitive adhesive strip
JP2017075228A (ja) * 2015-10-14 2017-04-20 日東電工株式会社 タブ付き粘着製品
US20180148618A1 (en) 2016-11-30 2018-05-31 Tesa Se Redetachable adhesive strip

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