WO2009082158A2 - Sheet for absorbing impact and sealing comprising adhesive layer and method of preparing the same - Google Patents

Sheet for absorbing impact and sealing comprising adhesive layer and method of preparing the same Download PDF

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Publication number
WO2009082158A2
WO2009082158A2 PCT/KR2008/007614 KR2008007614W WO2009082158A2 WO 2009082158 A2 WO2009082158 A2 WO 2009082158A2 KR 2008007614 W KR2008007614 W KR 2008007614W WO 2009082158 A2 WO2009082158 A2 WO 2009082158A2
Authority
WO
WIPO (PCT)
Prior art keywords
sheet
layer
absorbing impact
sealing
film layer
Prior art date
Application number
PCT/KR2008/007614
Other languages
French (fr)
Other versions
WO2009082158A3 (en
Inventor
Ho-Sung Yang
Original Assignee
Sk Utis Co., Ltd.
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Sk Utis Co., Ltd. filed Critical Sk Utis Co., Ltd.
Priority to CN200880121818.1A priority Critical patent/CN101918213B/en
Publication of WO2009082158A2 publication Critical patent/WO2009082158A2/en
Publication of WO2009082158A3 publication Critical patent/WO2009082158A3/en

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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
    • B32B27/00—Layered products comprising a layer of synthetic resin
    • B32B27/28—Layered products comprising a layer of synthetic resin comprising synthetic resins not wholly covered by any one of the sub-groups B32B27/30 - B32B27/42
    • 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
    • B32B27/36—Layered products comprising a layer of synthetic resin comprising polyesters
    • 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
    • B32B27/06—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
    • B32B27/08—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 synthetic resin
    • 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
    • B32B27/10—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 paper or cardboard
    • 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
    • B32B27/30—Layered products comprising a layer of synthetic resin comprising vinyl (co)polymers; comprising acrylic (co)polymers
    • B32B27/304—Layered products comprising a layer of synthetic resin comprising vinyl (co)polymers; comprising acrylic (co)polymers comprising vinyl halide (co)polymers, e.g. PVC, PVDC, PVF, PVDF
    • 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
    • B32B27/30—Layered products comprising a layer of synthetic resin comprising vinyl (co)polymers; comprising acrylic (co)polymers
    • B32B27/306—Layered products comprising a layer of synthetic resin comprising vinyl (co)polymers; comprising acrylic (co)polymers comprising vinyl acetate or vinyl alcohol (co)polymers
    • 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
    • B32B27/30—Layered products comprising a layer of synthetic resin comprising vinyl (co)polymers; comprising acrylic (co)polymers
    • B32B27/308—Layered products comprising a layer of synthetic resin comprising vinyl (co)polymers; comprising acrylic (co)polymers comprising acrylic (co)polymers
    • 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
    • B32B27/34—Layered products comprising a layer of synthetic resin comprising polyamides
    • 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
    • B32B27/36—Layered products comprising a layer of synthetic resin comprising polyesters
    • B32B27/365—Layered products comprising a layer of synthetic resin comprising polyesters comprising polycarbonates
    • 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
    • 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
    • B32B7/06—Interconnection of layers permitting easy separation
    • 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
    • B32B2255/10—Coating on the layer surface on synthetic resin layer or on natural or synthetic rubber layer
    • 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
    • B32B2255/12—Coating on the layer surface on paper layer
    • 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
    • B32B2266/0278—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
    • B32B2307/40—Properties of the layers or laminate having particular optical properties
    • B32B2307/412—Transparent
    • 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
    • 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
    • B32B2307/558—Impact strength, toughness
    • 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
    • B32B2307/748—Releasability
    • 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
    • B32B2457/00—Electrical equipment
    • B32B2457/20—Displays, e.g. liquid crystal displays, plasma displays
    • 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
    • B32B2457/00—Electrical equipment
    • B32B2457/20—Displays, e.g. liquid crystal displays, plasma displays
    • B32B2457/202—LCD, i.e. 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
    • C09J2301/16—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
    • C09J2301/40—Additional features of adhesives in the form of films or foils characterized by the presence of essential components
    • C09J2301/414—Additional features of adhesives in the form of films or foils characterized by the presence of essential components presence of a copolymer
    • 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
    • C09J2409/00—Presence of diene rubber
    • 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
    • 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
    • C09J2423/00—Presence of polyolefin
    • C09J2423/16—Presence of ethen-propene or ethene-propene-diene 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
    • C09J2427/00—Presence of halogenated polymer
    • C09J2427/006—Presence of halogenated polymer 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
    • C09J2431/00—Presence of polyvinyl acetate
    • 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
    • C09J2431/00—Presence of polyvinyl acetate
    • C09J2431/006—Presence of polyvinyl acetate 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
    • C09J2433/00—Presence of (meth)acrylic polymer
    • 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
    • C09J2453/00—Presence of block copolymer
    • 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
    • C09J2467/00—Presence of polyester
    • C09J2467/006—Presence of polyester 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
    • C09J2469/00—Presence of polycarbonate
    • C09J2469/006—Presence of polycarbonate 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
    • C09J2477/00—Presence of polyamide
    • C09J2477/006—Presence of polyamide in the substrate

Definitions

  • the present invention relates to a sheet for absorbing impact and sealing, including an adhesive layer. More specifically, it relates to a sheet for absorbing impact and sealing in which an adhesive layer, a supporting film layer and a polyurethane layer are laminated sequentially, and a method of preparation thereof.
  • Electronic appliances such as mobile phones, hard-disk drives, televisions and liquid crystal display, consist of precise machine parts and electro-devices. Those electronic appliances are easily broken down or damaged from external impacts. Moreover, external pollutants such as dust cause overheating of electro-devices by disturbing air flow in the electronic appliances. Therefore this is a factor in the shortening of the life of electronic appliances.
  • Korean Patent Publication No. 2002-0015239 discloses a member for maintaining a gap and blocking heat in a liquid crystal display. It prevents damages or wrinkling of optical sheets by a guide-panel of the liquid crystal display, maintains the gap between the guide-panel and a light guide plate, and blocks an influx of heat and foreign substance through the gap.
  • the member is formed of a pad of silicon material.
  • Korean Patent Publication No. 2005-0058055 discloses an additional elastic layer between substrates to prevent gravitational defect of the liquid crystal display.
  • the elastic layer is formed of polyurethane rubber by coating a paste comprising aromatic di-isocyanate, polyol and 1 ,4-butandiol, and then curing it on the substrate.
  • the member or the elastic layer disclosed in the Korean Patent Publication Nos. 2002-0015239 and 2005-0058055 impart elasticity and a good sealing effect to electronic home appliances or electronic devices by using silicon or polyurethane.
  • the elastic layer of the Korean Patent Publication No. 2005-0058055 has a troublesomeness, which needs coating with a pattern after forming a composite paste of an elastic layer, in its forming process.
  • the silicon pad of the Korean Patent Publication No. 2002-0015239 has a merit that it is easily applied to many kinds of electronic home appliances or electronic devices because of its sheet configuration.
  • the sheet such as a silicon pad is attached to an electronic device by placing double-sided adhesive on one face of the pad or attaching it to the electronic device after coating one face of the pad with an acrylic adhesive.
  • the silicon material of the pad has low surface tension and poor adhesive strength to adhesive tape or adhesives.
  • PVC polyvinyl chloride
  • PVC polyvinyl chloride
  • a silicon sheet is manufactured by coating a silicon pad with adhesives or laminating adhesive-tape on silicon pad.
  • the sheet is laminated with a double-sided tape and fixed to maintaining its position at applying-parts of the electronic devices during assembly or use of the product.
  • the thickness of the entire sheet is increased, and the thickness of the compressible part reduced , if there is a thickness limitation. Because of the reduction in the proportion of incompressible material, a required compressibility of the entire sheet is decreased, and it doesn't eventually meet the demand for absorbing an impact and closing up a gap.
  • the loss of product material and the incidence of poor quality, which is caused by adding the process of applying the double-sided tape are increased, and work productivity is reduced.
  • the present invention provides a sheet for absorbing impact and sealing prepared by using a supporting film layer with an adhesive layer.
  • the present invention decreases the number of the adhesive layer and the supporting film layer additionally applied to the sheet and increases relative thickness of a polyurethane layer which has high compressibility. Therefore, the present invention enables the preparation of the sheet for absorbing impact and sealing, which shows the higher ability of absorbing impact and sealing, and has a simplified manufacturing process.
  • a sheet for absorbing impact and sealing that comprises a supporting film layer including an adhesive layer and a foam-layer for absorbing impact.
  • the present invention provides the sheet for absorbing impact and sealing that comprises the supporting film layer, the adhesive layer formed on one face of the supporting film layer, and a foam-layer for absorbing impact formed on the other face of the supporting film layer.
  • the sheet of the present invention may further includes a release-film layer or a release-paper layer laminated on the adhesive layer.
  • a method to prepare the sheet for absorbing impact and sealing there is provided.
  • the method to prepare the sheet may comprise: forming an adhesive layer on a supporting film layer by coating adhesive on one face of the supporting film layer; and forming a foam-layer for absorbing impact by coating a foamed material for absorbing impact on the other face of the supporting film layer, that is on the opposite side of the adhesive layer, and curing the foamed material.
  • a method to prepare the sheet for absorbing impact and sealing may comprise: forming a foam-layer for absorbing impact by coating a foamed material for absorbing impact on one face of the supporting film layer, and curing the foamed material; and forming an adhesive layer by coating adhesive on the other face of the supporting film layer, that is on the opposite side of the foam layer.
  • the method to prepare the sheet may further comprise: forming a release-film layer or a release-paper layer by laminating a release-film or a release-paper on the adhesive layer after forming the adhesive layer.
  • Fig.l shows in sequence a manufacturing process of a sheet for absorbing impact according to the prior art.
  • Fig.2 shows in sequence a manufacturing process of a sheet for absorbing impact comprising adhesive according to the present invention.
  • Fig.3 shows a sectional structure of the sheet for absorbing impact according to the prior art.
  • Fig.4 shows a sectional structure of the sheet for absorbing impact in which double-sided tape is laminated on the sheet for absorbing impact according to the prior art.
  • Fig.5 shows a sectional structure of the sheet for absorbing impact comprising the adhesive layer according to the present invention.
  • Fig.l shows a manufacturing process of the sheet for absorbing impact according to the prior art
  • Fig.2 shows a manufacturing process of the sheet for absorbing impact comprising adhesive according to the present invention.
  • the sheet for absorbing impact according to the prior art had to comprise a laminating process using double-sided tape for forming a foamed layer for absorbing impact and/or a release film layer on a supporting layer.
  • the present invention having the supporting film layer on which an adhesive layer formed does not need an extra laminating process. Therefore, it has merits to simplify the process, and to lower the loss of material and the incidence of poor quality.
  • Fig.3 shows a sectional structure of the sheet for absorbing impact according to the prior art
  • Fig.4 shows a sectional structure of the sheet for absorbing impact in which a double-sided tape is laminated on the sheet according to the prior art
  • Fig.3 shows a section consisting of a supporting film layer(10)/a polyurethane layer(20)
  • Fig.4 shows the section consisting of a release film layer(40)/an adhesive layer(30)/a supporting film layer(10)/an adhesive film layer(30)/a supporting film layer(10)/a polyurethane layer(20).
  • a structure such as in Fig.3 has a limit as a sheet for absorbing impact because it only has 2 layers.
  • Fig.5 shows a sectional structure of the sheet for absorbing impact and sealing according to the present invention.
  • the sheet comprises the supporting film layer on which the adhesive layer is formed.
  • the section consists of the release film layer(40)/the adhesive layer(30)/the supporting film layer(10)/the polyurethane layer(20).
  • the sign 22 in the Fig.5 shows a thickness that is entirely increased in case of using double-sided tape or a thickness of polyurethane layer that is relatively decreased in case of maintaining the overall thickness.
  • the present invention protects the components of electronic devices from external impact, and has a great ability to shut out the influx of pollutants such as dust. It also has a relatively high thickness of polyurethane layer within same thickness of the sheet because it minimizes the portion of the unnecessary incompressible material layer. Therefore, the present invention shows higher compressibility and better ability of absorbing impact and sealing than the sheet of the prior art that double-sided tape is laminated on the supporting film layer.
  • the method for preparation of the sheet for absorbing impact and sealing may comprise: forming an adhesive layer on a supporting film layer by coating the adhesive on one face of the supporting film layer; and forming a foam-layer for absorbing impact by coating a foamed material for absorbing impact on the other face of the supporting film layer, that is on the opposite side of the adhesive layer, and curing the foamed material
  • the supporting film layer(l ⁇ ) acts as a substrate, and it can consist of any material that is usually used in the sheet for absorbing impact and sealing.
  • the supporting film layer may be a transparent or white plastic film.
  • it may be at least one material selected from the group consisting of polyethylene terephthalate (PET), polyethylene naphthalate (PEN), polyester, polyamide, polycarbonate, an ethylene vinyl acetate copolymer, an ethylene-ethyl acrylate copolymer, an ethylene-propylene copolymer, and polyvinyl chloride.
  • PET polyethylene terephthalate
  • PEN polyethylene naphthalate
  • polyester polyamide
  • polycarbonate an ethylene vinyl acetate copolymer
  • an ethylene-ethyl acrylate copolymer an ethylene-propylene copolymer
  • polyvinyl chloride polyvinyl chloride
  • the supporting film layer(l ⁇ ) may impart an adequate supporting strength to the sheet, and it may also impart excellent usability because it is easy to control the shape in laminating the adhesive layer on the product.
  • the thickness of the supporting film layer(l ⁇ ) can be controlled depending on properties of the product. In order to have a minimum supporting strength for keeping the shape, it is preferable that it has a thickness of 5 ⁇ m or more, and in order to prevent the entire sheet from being too thick, it is preferable that it has a thickness of 125 ⁇ m or less.
  • the adhesive layer (30) may be manufactured from any adhesive material that is usually used in the related field, if it has adequate adhesive strength to other materials, such as lkgf per inch or more and is heat-resistant to 60 ° C or more.
  • the adhesive material includes at least one adhesive selected from the group consisting of natural rubber adhesives; styrene-butadiene latex based adhesives; an ABA block copolymer-type thermoplastic rubber(A denotes thermoplastic polystyrene terminal block and B denotes rubber intermediate block such as polyisoprene, polybutadiene, or poly(ethylene/butylene)); isobutylene-isoprene rubber; polyisobutylene; acrylic adhesives such as polyacrylate and vinyl acetate/acryl ester copolymer; and a vinyl ether copolymer such as polyvinylmethylether, polyvinylethylether and polyvinylisobutylether.
  • A denotes thermoplastic polystyrene terminal block
  • B denotes rubber intermediate block such as polyisoprene, polybutadiene, or poly(ethylene/butylene)
  • isobutylene-isoprene rubber polyisobutylene
  • acrylic adhesives
  • Preferable examples include at least one adhesive selected from the group consisting of vinyl acetate, methyl methacrylate, ethyl acetoacrylate and sulfonated polystyrene.
  • the adhesive layer(30) is for preventing the sheet from being separated from the applying-parts of the electronic devices during assembly or when using the devices.
  • a peel-strength of the adhesive layer from the supporting film layer is preferably to be the extent of not being separated from the supporting film layer after some time, such as at least 200gr/cm or more.
  • the adhesive layer may include a material that has adhesive strength of 500 gr/inch or more and heat-resistance to 60 ° Cor more, in order to secure the durability of the product in application to assembly of a mobile display.
  • the adhesive layer(30) is formed by coating one face of the supporting film layer, which is transparent or white plastic such as PET or PEN, with an adhesive.
  • the supporting film layer which is transparent or white plastic such as PET or PEN
  • an adhesive it is possible to use any coating method that can be generally used in related fields. Examples include gravure, micro-gravure, die coating, comma coating, dip coating, and so on. However, it is not limited to the above examples.
  • the thickness of the adhesive layer formed on one face of the supporting film layer(l ⁇ ) is preferably 5 ⁇ m or more for adequate adhesive strength. And, it is also preferable to be 150 ⁇ m or less for preventing an excess thickness of the final product and the incident in Thomson processing, that the adhesive is pushed to the edge and pollutes product and machinery due to an extremely thick adhesive layer.
  • the sheet for absorbing impact and sealing of the present invention may further comprise a release film layer or release paper layer laminated on the adhesive layer.
  • the release film layer or release paper layer may be transparent or white plastic film.
  • the plastic film may be at least one selected from the group consisting of polyethylene(PE), polyethylene terephthalate(PET), polyethylene naphthalate(PEN) and so on. However, they are not limited to the above examples.
  • the thickness of the release-film layer or release-paper layer is preferably in a range of 5-125 ⁇ m. If the release film layer or release paper layer is too thin, it is difficult to remove the release film at the usage. If the release-film layer or release-paper layer is too thick, it influences the entire thickness of the product.
  • peel strength of the release-film layer or release-paper layer from the adhesive layer is preferably at least 5gr/cm.
  • the release paper layer is easily separated from the adhesive layer when manufacturing the product, so it is difficult to manufacture or move the product.
  • high peel strength it is difficult to remove the release film layer at the usage.
  • the sheet for absorbing impact and sealing of the present invention comprises a foam layer for absorbing impact formed of foamed material and coated on the other face of the supporting film layer, that is on the opposite side of the adhesive layer.
  • the thickness of the coated foam-layer for absorbing impact is preferably to be 0.05mm or more for maintaining a minimum acceptable effect of absorbing impact.
  • a thickness of 1 Omm or less is also preferable for maintaining the sealing effect on rough surface of an electronic device and for making the electronic-device light, thin, short, and small by preventing the final product from being too thick..
  • the foamed material for absorbing impact of the present invention may be foamed polyurethane. And as occasion demands it may be treated by ESD(electro-static discharge).
  • the foamed polyurethane which is formed by a reaction with polyol and polyisocyanate, may have a specific gravity in an range of 3 gr/cm 3 to 90gr/cm 3 .
  • the polyol may be at least one selected from the group consisting of a polyether polyol such as polyethylene glycol, polypropylene glycol, polytetramethylene glycol, and so on; a polyester polyol; a caprolactone polyol, and so on.
  • the isocyanate which is a monomer of the polyisocyanate, is at least one selected from the group consisting of methylene-diphenyl diisocyanate, polymeric methylene-diphenyl diisocyanate, modified methylene-diphenyl diisocyanate, toluene diisocyanate, isophorone diisocyanate, hexamethylene diisocyanate, a modified carbodiimide of the diisocyanate, a dimmer of the diisocyanate, a trimer of the diisocyanate, a prepolymer formed by a reaction between diisocyanate and a polyol, and so on.
  • a catalyst is usually used.
  • the catalyst may be at least one selected from the group consisting of a metal catalyst such as dibutyltin dilaurate, tetrabutyl titanate and so on; and an amine catalyst such as trimethyl amine, triethyl amine, triethanolamine and so on.
  • a fluorine foaming-agent, a chlorine foaming agent and a hydrocarbon foaming-agent may be used. Foaming by inert gas or water may also be applied, and a small amount of a silicon surfactant may be used.
  • Materials such as the polyol and polyisocyanate, and additives such as catalyst are coated on the supporting film layer after uniformly mixing, for example, with an Oaks mixer.
  • the foamed polyurethane which is coated within a definite range as mentioned above, is manufactured into a foam with a uniform thickness by putting it into a continuous setting oven and curing it at 120 ° C or more.
  • the foamed polyurethane of the present invention preferably has the following property. It is preferable to have an adequate ability to absorb impact, and it preferably has repulsive power in a range of 15 to 50 % as a result of a ball bound test according to ASTM D3574.
  • the sheet for absorbing impact and sealing of the present invention is somewhat compressed for sealing when it is applied to the product and assembled. If the compressive strength of the foamed polyurethane is excessive, it causes mechanical damage or lowers the efficiency of assembling work because it needs a large strength in assembling. Therefore, the compressive strength of the foamed polyurethane needs to be within an adequate range, which is preferably 5 kgf/cm 2 or less at 25% compression.
  • a permanent- compression-strain-rate of the foamed polyurethane ranges from 0.5 to 10% to prevent strain of the sheet long after applying it to the product.
  • the expansion coefficient of the foamed polyurethane is preferably 100% or more for adhering it to the device.
  • the Shore A Hardness of the foamed material is preferably 5 or more to prevent deterioration in mechanical properties, and less than 80 to prevent putting too much stress to the electronic device in assembling process, and to show an adequate property of absorbing impact. It is preferable that a tensile strength of the foamed material is from 2 to 3kgf/cm 2 for the same reason as for the above hardness.
  • the method for preparation of the sheet for absorbing impact and sealing may comprise: forming a foam-layer for absorbing impact by coating a foamed material for absorbing impact on one face of the supporting film layer, and curing the foamed material; and forming an adhesive layer by coating adhesive on the other face of the supporting film layer, that is on the opposite side of the foam layer.
  • the material and the method of forming in each step may be same as for one embodiment of the present invention as described above except for the order of forming layers.
  • it may further comprise forming a release-film layer or a release- paper layer by laminating a release-film or a release-paper on the adhesive layer after forming the adhesive layer.
  • the present invention may provide a sheet for absorbing impact and sealing that protects components of an electronic device from being damaged by external impact and has a great ability to shut out the influx of outside pollutants such as dust. It also has a relatively high thickness of the polyurethane layer within same thickness of the sheet because it minimizes the unnecessary portion of the incompressible material layer. Therefore, the present invention shows higher compressibility and better ability for absorbing impact and sealing than the sheet of the prior art that a double-sided tape is laminated on a substrate. Moreover, according to the preparation method of the present invention, there are merits to simplify of the preparation process of the sheet, and to lower the loss of material and the incidence of poor quality because it can omit the laminating process. The present invention is further described and illustrated in examples provided below, which are, however, not intended to limit the scope of the present invention.
  • Example 1 forming the adhesive substrate
  • HIDENOL SA-330A (Hansung-polymer Ltd.) was coated on transparent PET, of which a thickness was 50 ⁇ m, with a thickness of 50 ⁇ m using a comma-coater. The coated film was put and dried in an oven at 120- 140 " C for 5 minute. Immediately after drying, it was laminated with a silicon coated release PET film, and wound in a roll.
  • Example 2 preparation the sheet for absorbing After mixing materials as shown in the following Table 2 except for ISONATETM 143L, they were mixed with ISONATETM 143L using an Oaks mixer. Thereafter, the PET film of the adhesive substrate from the Example 1 was coated with the above mixture at a thickness of 0.5 mm, 1 mm, and 2 mm by using a comma coater. The coated material was cured in an oven at 130-160 "C for 12 minutes and was the prepared in a continuous automatic process and wound in a roll immediately after preparation.
  • Example 3 Property of the prepared sheet for absorbing impact

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  • Organic Chemistry (AREA)
  • Laminated Bodies (AREA)
  • Adhesive Tapes (AREA)

Abstract

The present invention relates to a sheet for absorbing impact and sealing comprising an adhesive layer. More specifically, it relates to a sheet for absorbing impact and sealing in which the adhesive layer, a supporting film layer and a polyurethane layer are laminated sequentially, and a method of preparing thereof. The sheet for absorbing impact and sealing of the present invention comprises the adhesive layer on one face of the supporting film layer used as a substrate. Thus, it has a relatively high thickness of the polyurethane layer within same thickness of the sheet. Therefore, when applying to an electronic device, it shows higher compressibility, and better ability of absorbing impact and sealing than a sheet in which a two-faces-tape is laminated on a substrate. Moreover, the preparation method of the present invention has merits to simplify the preparation process of the sheet, and to lower the loss of material and the incidence of poor quality because it can omit the laminating process.

Description

TITLE OF THE INVENTION
SHEET FOR ABSORBING IMPACT AND SEALING COMPRISING ADHESIVE LAYER AND METHOD OF PREPARING THE SAME
BACKGROUND OF THE INVENTION
(a) Field of the Invention
The present invention relates to a sheet for absorbing impact and sealing, including an adhesive layer. More specifically, it relates to a sheet for absorbing impact and sealing in which an adhesive layer, a supporting film layer and a polyurethane layer are laminated sequentially, and a method of preparation thereof.
(b) Description of the Related Art
Electronic appliances, such as mobile phones, hard-disk drives, televisions and liquid crystal display, consist of precise machine parts and electro-devices. Those electronic appliances are easily broken down or damaged from external impacts. Moreover, external pollutants such as dust cause overheating of electro-devices by disturbing air flow in the electronic appliances. Therefore this is a factor in the shortening of the life of electronic appliances.
In order to solve these problems, electronic appliances generally have a sheet for sealing to absorb impacts and close up a gap. For example, Korean Patent Publication No. 2002-0015239 discloses a member for maintaining a gap and blocking heat in a liquid crystal display. It prevents damages or wrinkling of optical sheets by a guide-panel of the liquid crystal display, maintains the gap between the guide-panel and a light guide plate, and blocks an influx of heat and foreign substance through the gap. The member is formed of a pad of silicon material. Moreover, Korean Patent Publication No. 2005-0058055 discloses an additional elastic layer between substrates to prevent gravitational defect of the liquid crystal display. The elastic layer is formed of polyurethane rubber by coating a paste comprising aromatic di-isocyanate, polyol and 1 ,4-butandiol, and then curing it on the substrate. The member or the elastic layer disclosed in the Korean Patent Publication Nos. 2002-0015239 and 2005-0058055 impart elasticity and a good sealing effect to electronic home appliances or electronic devices by using silicon or polyurethane.
However, the elastic layer of the Korean Patent Publication No. 2005-0058055 has a troublesomeness, which needs coating with a pattern after forming a composite paste of an elastic layer, in its forming process. On the other hand, the silicon pad of the Korean Patent Publication No. 2002-0015239 has a merit that it is easily applied to many kinds of electronic home appliances or electronic devices because of its sheet configuration. The sheet such as a silicon pad is attached to an electronic device by placing double-sided adhesive on one face of the pad or attaching it to the electronic device after coating one face of the pad with an acrylic adhesive. However, there is a problem of exfoliation of the silicon sheet after attaching it to the electronic device, because the silicon material of the pad has low surface tension and poor adhesive strength to adhesive tape or adhesives.
In order to solve the problem, there has been a recent attempt to coat silicon pad with an additional primer. Even though the attempt can impart a satisfactory adhesive strength, it has problems such as a more complicated process by adding a process of primer coating, soaring manufacturing costs, and environmental problems of organic solvents contained in the primer coating composite. Therefore, there has been an attempt to use silicon as a material of the adhesive or adhesive tape to improve the adhesive strength between silicon and the adhesive without using primer. However, this attempt has not only lowered the adhesive power but also increased manufacturing costs.
Furthermore, polyvinyl chloride (PVC) has been suggested as a substitute for silicon. However, PVC is too high hard, so it needs a large amount of plasticizer to develop elasticity and a good sealing property. The plasticizer is easily transferred to the surface of an electronic device as time goes passes and it pollutes the inside of devices and components. Thus, it causes a malfunction of the device and shortens the life of the device. Moreover, a silicon sheet is manufactured by coating a silicon pad with adhesives or laminating adhesive-tape on silicon pad. These processes serve to lower the speed of manufacturing in a continuous automatic process because of its step of applying pressure by hand.
Moreover, the sheet is laminated with a double-sided tape and fixed to maintaining its position at applying-parts of the electronic devices during assembly or use of the product. However, because of use of the double-sided tape, the thickness of the entire sheet is increased, and the thickness of the compressible part reduced , if there is a thickness limitation. Because of the reduction in the proportion of incompressible material, a required compressibility of the entire sheet is decreased, and it doesn't eventually meet the demand for absorbing an impact and closing up a gap. Furthermore, the loss of product material and the incidence of poor quality, which is caused by adding the process of applying the double-sided tape, are increased, and work productivity is reduced.
SUMMARY OF THE INVENTION In order to solve the problems, the present invention provides a sheet for absorbing impact and sealing prepared by using a supporting film layer with an adhesive layer. Thus, the present invention decreases the number of the adhesive layer and the supporting film layer additionally applied to the sheet and increases relative thickness of a polyurethane layer which has high compressibility. Therefore, the present invention enables the preparation of the sheet for absorbing impact and sealing, which shows the higher ability of absorbing impact and sealing, and has a simplified manufacturing process.
Therefore, it is an aspect of the present invention to provide a sheet for absorbing impact and sealing that comprises a supporting film layer including an adhesive layer and a foam-layer for absorbing impact.
It is another aspect of the present invention to provide a method to prepare the sheet for absorbing impact and sealing.
To achieve the aspects, the present invention provides the sheet for absorbing impact and sealing that comprises the supporting film layer, the adhesive layer formed on one face of the supporting film layer, and a foam-layer for absorbing impact formed on the other face of the supporting film layer. The sheet of the present invention may further includes a release-film layer or a release-paper layer laminated on the adhesive layer. In accordance with another aspect of the present invention, there is provided a method to prepare the sheet for absorbing impact and sealing. The method to prepare the sheet may comprise: forming an adhesive layer on a supporting film layer by coating adhesive on one face of the supporting film layer; and forming a foam-layer for absorbing impact by coating a foamed material for absorbing impact on the other face of the supporting film layer, that is on the opposite side of the adhesive layer, and curing the foamed material.
In accordance with further aspect of the present invention, there is provided a method to prepare the sheet for absorbing impact and sealing. The method to prepare the sheet may comprise: forming a foam-layer for absorbing impact by coating a foamed material for absorbing impact on one face of the supporting film layer, and curing the foamed material; and forming an adhesive layer by coating adhesive on the other face of the supporting film layer, that is on the opposite side of the foam layer.
The method to prepare the sheet may further comprise: forming a release-film layer or a release-paper layer by laminating a release-film or a release-paper on the adhesive layer after forming the adhesive layer.
BRIEF DESCRIPTION OF THE DRAWING
Fig.l shows in sequence a manufacturing process of a sheet for absorbing impact according to the prior art. Fig.2 shows in sequence a manufacturing process of a sheet for absorbing impact comprising adhesive according to the present invention.
Fig.3 shows a sectional structure of the sheet for absorbing impact according to the prior art. Fig.4 shows a sectional structure of the sheet for absorbing impact in which double-sided tape is laminated on the sheet for absorbing impact according to the prior art.
Fig.5 shows a sectional structure of the sheet for absorbing impact comprising the adhesive layer according to the present invention.
<Explanation of signs in figures>
10: supporting film layer
20: polyurethane layer
30: adhesive layer 40: release-film layer
DETAILED DESCRIPTION OF THE EMBODIMENTS
Hereinafter, the present invention is explained in detail according to Figs. 1 to 5. Fig.l shows a manufacturing process of the sheet for absorbing impact according to the prior art, and Fig.2 shows a manufacturing process of the sheet for absorbing impact comprising adhesive according to the present invention. The sheet for absorbing impact according to the prior art had to comprise a laminating process using double-sided tape for forming a foamed layer for absorbing impact and/or a release film layer on a supporting layer. However, the present invention having the supporting film layer on which an adhesive layer formed does not need an extra laminating process. Therefore, it has merits to simplify the process, and to lower the loss of material and the incidence of poor quality.
Fig.3 shows a sectional structure of the sheet for absorbing impact according to the prior art, and Fig.4 shows a sectional structure of the sheet for absorbing impact in which a double-sided tape is laminated on the sheet according to the prior art. Fig.3 shows a section consisting of a supporting film layer(10)/a polyurethane layer(20), and Fig.4 shows the section consisting of a release film layer(40)/an adhesive layer(30)/a supporting film layer(10)/an adhesive film layer(30)/a supporting film layer(10)/a polyurethane layer(20). A structure such as in Fig.3 has a limit as a sheet for absorbing impact because it only has 2 layers. Moreover, the sheet that is laminated with a double- sided tape, such as in Fig.4, has low overall compressibility because the portion of the incompressible material is relatively large. Therefore, it causes a problem in that the ability to absorb impact and to seal is reduced. On the other hand, Fig.5 shows a sectional structure of the sheet for absorbing impact and sealing according to the present invention. The sheet comprises the supporting film layer on which the adhesive layer is formed. The section consists of the release film layer(40)/the adhesive layer(30)/the supporting film layer(10)/the polyurethane layer(20). The sign 22 in the Fig.5(the box indicated in the dotted line) shows a thickness that is entirely increased in case of using double-sided tape or a thickness of polyurethane layer that is relatively decreased in case of maintaining the overall thickness. The present invention protects the components of electronic devices from external impact, and has a great ability to shut out the influx of pollutants such as dust. It also has a relatively high thickness of polyurethane layer within same thickness of the sheet because it minimizes the portion of the unnecessary incompressible material layer. Therefore, the present invention shows higher compressibility and better ability of absorbing impact and sealing than the sheet of the prior art that double-sided tape is laminated on the supporting film layer.
According to one embodiment of the present invention, the method for preparation of the sheet for absorbing impact and sealing may comprise: forming an adhesive layer on a supporting film layer by coating the adhesive on one face of the supporting film layer; and forming a foam-layer for absorbing impact by coating a foamed material for absorbing impact on the other face of the supporting film layer, that is on the opposite side of the adhesive layer, and curing the foamed material In the present invention, the supporting film layer(lθ) acts as a substrate, and it can consist of any material that is usually used in the sheet for absorbing impact and sealing. For example, the supporting film layer may be a transparent or white plastic film. In detail, it may be at least one material selected from the group consisting of polyethylene terephthalate (PET), polyethylene naphthalate (PEN), polyester, polyamide, polycarbonate, an ethylene vinyl acetate copolymer, an ethylene-ethyl acrylate copolymer, an ethylene-propylene copolymer, and polyvinyl chloride. However, it is not limited to the above example. In order to improve the adhesiveness of the substrate to the adhesive layer and polyurethane layer, it is preferable to treat the supporting film layer, with a corona discharge treatment, a plasma treatment, a blasting treatment, a chemical etching treatment, a primer treatment, and so on.
The supporting film layer(lθ) may impart an adequate supporting strength to the sheet, and it may also impart excellent usability because it is easy to control the shape in laminating the adhesive layer on the product. According to the present invention, the thickness of the supporting film layer(lθ) can be controlled depending on properties of the product. In order to have a minimum supporting strength for keeping the shape, it is preferable that it has a thickness of 5 μm or more, and in order to prevent the entire sheet from being too thick, it is preferable that it has a thickness of 125 μm or less. The adhesive layer (30) may be manufactured from any adhesive material that is usually used in the related field, if it has adequate adhesive strength to other materials, such as lkgf per inch or more and is heat-resistant to 60 °C or more. Representative examples of the adhesive material includes at least one adhesive selected from the group consisting of natural rubber adhesives; styrene-butadiene latex based adhesives; an ABA block copolymer-type thermoplastic rubber(A denotes thermoplastic polystyrene terminal block and B denotes rubber intermediate block such as polyisoprene, polybutadiene, or poly(ethylene/butylene)); isobutylene-isoprene rubber; polyisobutylene; acrylic adhesives such as polyacrylate and vinyl acetate/acryl ester copolymer; and a vinyl ether copolymer such as polyvinylmethylether, polyvinylethylether and polyvinylisobutylether. Preferable examples include at least one adhesive selected from the group consisting of vinyl acetate, methyl methacrylate, ethyl acetoacrylate and sulfonated polystyrene. However, it is not limited to the above examples. According to the present invention, the adhesive layer(30) is for preventing the sheet from being separated from the applying-parts of the electronic devices during assembly or when using the devices. For this purpose, a peel-strength of the adhesive layer from the supporting film layer is preferably to be the extent of not being separated from the supporting film layer after some time, such as at least 200gr/cm or more.
Furthermore, the adhesive layer may include a material that has adhesive strength of 500 gr/inch or more and heat-resistance to 60°Cor more, in order to secure the durability of the product in application to assembly of a mobile display.
The adhesive layer(30) is formed by coating one face of the supporting film layer, which is transparent or white plastic such as PET or PEN, with an adhesive. In other words, it is possible to use any coating method that can be generally used in related fields. Examples include gravure, micro-gravure, die coating, comma coating, dip coating, and so on. However, it is not limited to the above examples. The thickness of the adhesive layer formed on one face of the supporting film layer(lθ) is preferably 5 μm or more for adequate adhesive strength. And, it is also preferable to be 150 μm or less for preventing an excess thickness of the final product and the incident in Thomson processing, that the adhesive is pushed to the edge and pollutes product and machinery due to an extremely thick adhesive layer.
The sheet for absorbing impact and sealing of the present invention may further comprise a release film layer or release paper layer laminated on the adhesive layer. The release film layer or release paper layer may be transparent or white plastic film. In detail, the plastic film may be at least one selected from the group consisting of polyethylene(PE), polyethylene terephthalate(PET), polyethylene naphthalate(PEN) and so on. However, they are not limited to the above examples. The thickness of the release-film layer or release-paper layer is preferably in a range of 5-125 μm. If the release film layer or release paper layer is too thin, it is difficult to remove the release film at the usage. If the release-film layer or release-paper layer is too thick, it influences the entire thickness of the product. Thus, it is preferable to use the release film layer or release paper layer having the above-mentioned thickness. In addition, peel strength of the release-film layer or release-paper layer from the adhesive layer is preferably at least 5gr/cm. In the case of low peel strength, the release paper layer is easily separated from the adhesive layer when manufacturing the product, so it is difficult to manufacture or move the product. In the case of high peel strength, it is difficult to remove the release film layer at the usage. Thus, it is preferable to maintain the certain level. The sheet for absorbing impact and sealing of the present invention comprises a foam layer for absorbing impact formed of foamed material and coated on the other face of the supporting film layer, that is on the opposite side of the adhesive layer. The thickness of the coated foam-layer for absorbing impact is preferably to be 0.05mm or more for maintaining a minimum acceptable effect of absorbing impact. A thickness of 1 Omm or less is also preferable for maintaining the sealing effect on rough surface of an electronic device and for making the electronic-device light, thin, short, and small by preventing the final product from being too thick..
The foamed material for absorbing impact of the present invention may be foamed polyurethane. And as occasion demands it may be treated by ESD(electro-static discharge). The foamed polyurethane, which is formed by a reaction with polyol and polyisocyanate, may have a specific gravity in an range of 3 gr/cm3 to 90gr/cm3. The polyol may be at least one selected from the group consisting of a polyether polyol such as polyethylene glycol, polypropylene glycol, polytetramethylene glycol, and so on; a polyester polyol; a caprolactone polyol, and so on. Furthermore, the isocyanate, which is a monomer of the polyisocyanate, is at least one selected from the group consisting of methylene-diphenyl diisocyanate, polymeric methylene-diphenyl diisocyanate, modified methylene-diphenyl diisocyanate, toluene diisocyanate, isophorone diisocyanate, hexamethylene diisocyanate, a modified carbodiimide of the diisocyanate, a dimmer of the diisocyanate, a trimer of the diisocyanate, a prepolymer formed by a reaction between diisocyanate and a polyol, and so on.
In the reaction between the polyol and the polyisocyanate, a catalyst is usually used. The catalyst may be at least one selected from the group consisting of a metal catalyst such as dibutyltin dilaurate, tetrabutyl titanate and so on; and an amine catalyst such as trimethyl amine, triethyl amine, triethanolamine and so on. For foaming of the foamed material, a fluorine foaming-agent, a chlorine foaming agent and a hydrocarbon foaming-agent may be used. Foaming by inert gas or water may also be applied, and a small amount of a silicon surfactant may be used. Materials such as the polyol and polyisocyanate, and additives such as catalyst are coated on the supporting film layer after uniformly mixing, for example, with an Oaks mixer. The foamed polyurethane, which is coated within a definite range as mentioned above, is manufactured into a foam with a uniform thickness by putting it into a continuous setting oven and curing it at 120°C or more.
The foamed polyurethane of the present invention preferably has the following property. It is preferable to have an adequate ability to absorb impact, and it preferably has repulsive power in a range of 15 to 50 % as a result of a ball bound test according to ASTM D3574. The sheet for absorbing impact and sealing of the present invention is somewhat compressed for sealing when it is applied to the product and assembled. If the compressive strength of the foamed polyurethane is excessive, it causes mechanical damage or lowers the efficiency of assembling work because it needs a large strength in assembling. Therefore, the compressive strength of the foamed polyurethane needs to be within an adequate range, which is preferably 5 kgf/cm2 or less at 25% compression. More preferably, it is 0.01 to 5 kgf/cm2. Moreover, it is preferable that a permanent- compression-strain-rate of the foamed polyurethane ranges from 0.5 to 10% to prevent strain of the sheet long after applying it to the product. Furthermore, the expansion coefficient of the foamed polyurethane is preferably 100% or more for adhering it to the device. The Shore A Hardness of the foamed material is preferably 5 or more to prevent deterioration in mechanical properties, and less than 80 to prevent putting too much stress to the electronic device in assembling process, and to show an adequate property of absorbing impact. It is preferable that a tensile strength of the foamed material is from 2 to 3kgf/cm2 for the same reason as for the above hardness.
According to another embodiment of the present invention, the method for preparation of the sheet for absorbing impact and sealing may comprise: forming a foam-layer for absorbing impact by coating a foamed material for absorbing impact on one face of the supporting film layer, and curing the foamed material; and forming an adhesive layer by coating adhesive on the other face of the supporting film layer, that is on the opposite side of the foam layer. The material and the method of forming in each step may be same as for one embodiment of the present invention as described above except for the order of forming layers. Moreover, similarly as in one embodiment of the present invention, it may further comprise forming a release-film layer or a release- paper layer by laminating a release-film or a release-paper on the adhesive layer after forming the adhesive layer.
As stated above, the present invention may provide a sheet for absorbing impact and sealing that protects components of an electronic device from being damaged by external impact and has a great ability to shut out the influx of outside pollutants such as dust. It also has a relatively high thickness of the polyurethane layer within same thickness of the sheet because it minimizes the unnecessary portion of the incompressible material layer. Therefore, the present invention shows higher compressibility and better ability for absorbing impact and sealing than the sheet of the prior art that a double-sided tape is laminated on a substrate. Moreover, according to the preparation method of the present invention, there are merits to simplify of the preparation process of the sheet, and to lower the loss of material and the incidence of poor quality because it can omit the laminating process. The present invention is further described and illustrated in examples provided below, which are, however, not intended to limit the scope of the present invention.
Example 1 : forming the adhesive substrate
HIDENOL SA-330A (Hansung-polymer Ltd.) was coated on transparent PET, of which a thickness was 50 μm, with a thickness of 50 μm using a comma-coater. The coated film was put and dried in an oven at 120- 140 "C for 5 minute. Immediately after drying, it was laminated with a silicon coated release PET film, and wound in a roll.
Example 2: preparation the sheet for absorbing After mixing materials as shown in the following Table 2 except for ISONATE™ 143L, they were mixed with ISONATE™ 143L using an Oaks mixer. Thereafter, the PET film of the adhesive substrate from the Example 1 was coated with the above mixture at a thickness of 0.5 mm, 1 mm, and 2 mm by using a comma coater. The coated material was cured in an oven at 130-160 "C for 12 minutes and was the prepared in a continuous automatic process and wound in a roll immediately after preparation.
[Table 2]
Figure imgf000013_0001
Example 3: Property of the prepared sheet for absorbing impact
The sheet prepared in the above Example2, which has the ability to seal and absorb impact, had the following properties. [Table 3]
Figure imgf000013_0002
Figure imgf000014_0001
^ (Annotaion) Adhesive heat-resisting property: After attaching to stainless steel test specimen, the distance that the sheet had moved in a week at 85 °C and a load of 500 gr/inch of load, was measured.

Claims

WHAT IS CLAIMED IS:
1. A sheet for absorbing impact and sealing comprising: a supporting film layer; an adhesive layer formed on one face of the supporting film layer; and a foam-layer for absorbing impact formed on the other face of the supporting film layer.
2. The sheet for absorbing impact and sealing of claim 1, wherein the supporting film layer has a thickness in a range of 5μm to 125μm.
3. The sheet for absorbing impact and sealing of claim 1, wherein the supporting film layer is formed of a transparent or white plastic film.
4. The sheet for absorbing impact and sealing of claim 1, wherein the supporting film layer includes at least one material selected from the group consisting of polyethylene terephthalatc (PET), polyethylene naphthalate (PEN), polyester, polyamidc, polycarbonate, an ethylene vinyl acetate copolymer, an ethylene-ethyl acrylatc copolymer, ethylene-propylene copolymer and polyvinyl chloride.
5. The sheet for absorbing impact and sealing of claim 1, wherein the adhesive layer is formed of at least one adhesive selected from the group consisting of styrene- butadiene latex based adhesive, an ABA block copolymer-type thermoplastic rubber (A denotes thermoplastic polystyrene terminal block and B denotes rubber intermediate block), isobutylene-isoprene rubber, polyisobutylene, acrylic adhesive, and vinyl ester copolymer.
6. The sheet for absorbing impact and sealing of claim 1, wherein the adhesive layer has a thickness in range of 5 μm to 150 /mi.
7. The sheet for absorbing impact and sealing of claim 1, wherein the adhesive layer has a peel-strength from the supporting film layer of 200gr/cm or more.
8. The sheet for absorbing impact and sealing of claim 1, wherein the foam layer for absorbing impact is formed of foamed polyurethane.
9. The sheet for absorbing impact and sealing of claim 8, wherein the foamed polyurethane has a repulsive force in a range of 15 to 50% as a result of a ball-rebound test, and has a compressive strength in a range of 0.01 to 5 kgf/cm2 at 25% compression.
10. The sheet for absorbing impact and sealing of claim 8, wherein the foamed polyurethane is treated by ESD (electro-static discharge)
11. The sheet for absorbing impact and sealing of claim 1 , further comprising a release film layer or release paper layer laminated on the adhesive layer
12. The sheet for absorbing impact and sealing of claim 11, wherein the release film layer or release paper layer has a thickness in a range of 5μm or 125μm
13. The sheet for absorbing impact and sealing of claim 11, wherein the release film layer or release paper layer has peel strength from the adhesive layer of 5 gr/cm or more
14. A method for preparation of a sheet for absorbing impact and sealing according to any one of claims 1 to 10 comprising: forming an adhesive layer on a supporting film layer by an coating adhesive on one face of the supporting film layer; and forming a foam layer for absorbing impact by coating a foamed material for absorbing impact on the other face of the supporting film layer, that is on the opposite side of the adhesive layer, and curing the foamed material.
15. The method for preparation of the sheet for absorbing impact and sealing of claim 14, further comprising: forming a release film layer or release paper layer by laminating a release-film or a release paper on the adhesive layer after forming the adhesive layer.
16. A method for preparation of a sheet for absorbing impact and sealing according to any one of claims 1 to 10 comprising: forming a foam layer for absorbing impact by coating a foamed material for absorbing impact on one face of the supporting film layer, and curing the foamed material; and forming an adhesive layer by coating an adhesive on the other face of the supporting film layer, that is on the opposite side of the foam layer.
17. The method for preparation of the sheet for absorbing impact and sealing of claim 16, which further comprising: forming a release film layer or a release paper layer by laminating a release film or a release paper on the adhesive layer after forming the adhesive layer.
PCT/KR2008/007614 2007-12-24 2008-12-23 Sheet for absorbing impact and sealing comprising adhesive layer and method of preparing the same WO2009082158A2 (en)

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KR101078353B1 (en) 2011-10-31
TW200932516A (en) 2009-08-01

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