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WO2010029773A1 - Film de protection pour une surface - Google Patents

Film de protection pour une surface Download PDF

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Publication number
WO2010029773A1
WO2010029773A1 PCT/JP2009/004549 JP2009004549W WO2010029773A1 WO 2010029773 A1 WO2010029773 A1 WO 2010029773A1 JP 2009004549 W JP2009004549 W JP 2009004549W WO 2010029773 A1 WO2010029773 A1 WO 2010029773A1
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WO
WIPO (PCT)
Prior art keywords
polymer
pressure
protective film
weight
sensitive adhesive
Prior art date
Legal status (The legal status 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 status listed.)
Ceased
Application number
PCT/JP2009/004549
Other languages
English (en)
Japanese (ja)
Inventor
豊嶋克典
多田博士
家田泰享
野世渓元
長尾功弘
川村真教
長谷川研二
大久保明彦
中村丈夫
佐野拓哉
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
JSR Corp
Sekisui Chemical Co Ltd
Original Assignee
JSR Corp
Sekisui Chemical 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 JSR Corp, Sekisui Chemical Co Ltd filed Critical JSR Corp
Priority to CN200980135434XA priority Critical patent/CN102149779B/zh
Priority to JP2010528623A priority patent/JP4620806B2/ja
Priority to KR1020117007076A priority patent/KR101176811B1/ko
Publication of WO2010029773A1 publication Critical patent/WO2010029773A1/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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    • 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
    • C09J153/00—Adhesives based on block copolymers containing at least one sequence of a polymer obtained by reactions only involving carbon-to-carbon unsaturated bonds; Adhesives based on derivatives of such polymers
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08F—MACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONLY INVOLVING CARBON-TO-CARBON UNSATURATED BONDS
    • C08F8/00—Chemical modification by after-treatment
    • C08F8/04—Reduction, e.g. hydrogenation
    • 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
    • C09J125/00—Adhesives based on homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and at least one being terminated by an aromatic carbocyclic ring; Adhesives based on derivatives of such polymers
    • C09J125/02—Homopolymers or copolymers of hydrocarbons
    • C09J125/04—Homopolymers or copolymers of styrene
    • C09J125/08—Copolymers of styrene
    • 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
    • C09J153/00—Adhesives based on block copolymers containing at least one sequence of a polymer obtained by reactions only involving carbon-to-carbon unsaturated bonds; Adhesives based on derivatives of such polymers
    • C09J153/02—Vinyl aromatic monomers and conjugated dienes
    • 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
    • C09J153/00—Adhesives based on block copolymers containing at least one sequence of a polymer obtained by reactions only involving carbon-to-carbon unsaturated bonds; Adhesives based on derivatives of such polymers
    • C09J153/02—Vinyl aromatic monomers and conjugated dienes
    • C09J153/025—Vinyl aromatic monomers and conjugated dienes modified
    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
    • C09J7/00—Adhesives in the form of films or foils
    • C09J7/20—Adhesives in the form of films or foils characterised by their carriers
    • C09J7/22—Plastics; Metallised plastics
    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
    • C09J7/00—Adhesives in the form of films or foils
    • C09J7/20—Adhesives in the form of films or foils characterised by their carriers
    • C09J7/22—Plastics; Metallised plastics
    • C09J7/24—Plastics; Metallised plastics based on macromolecular compounds obtained by reactions involving only carbon-to-carbon unsaturated bonds
    • C09J7/241—Polyolefin, e.g.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
    • 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
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
    • C08L2666/00—Composition of polymers characterized by a further compound in the blend, being organic macromolecular compounds, natural resins, waxes or and bituminous materials, non-macromolecular organic substances, inorganic substances or characterized by their function in the composition
    • C08L2666/02—Organic macromolecular compounds, natural resins, waxes or and bituminous materials
    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
    • C09J2203/00—Applications of adhesives in processes or use of adhesives in the form of films or foils
    • C09J2203/318—Applications of adhesives in processes or use of adhesives in the form of films or foils for the production of liquid crystal displays
    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
    • C09J2301/00—Additional features of adhesives in the form of films or foils
    • C09J2301/30—Additional features of adhesives in the form of films or foils characterized by the chemical, physicochemical or physical properties of the adhesive or the carrier
    • C09J2301/312—Additional features of adhesives in the form of films or foils characterized by the chemical, physicochemical or physical properties of the adhesive or the carrier parameters being the characterizing feature
    • 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
    • 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
    • C09J2453/00—Presence of block copolymer
    • G—PHYSICS
    • G02—OPTICS
    • G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
    • G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
    • G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour 
    • G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour  based on liquid crystals, e.g. single liquid crystal display cells
    • G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
    • G02F1/1333—Constructional arrangements; Manufacturing methods
    • G02F1/1335—Structural association of cells with optical devices, e.g. polarisers or reflectors
    • G02F1/1336—Illuminating devices
    • G02F1/133602—Direct backlight
    • G02F1/133606—Direct backlight including a specially adapted diffusing, scattering or light controlling members
    • G02F1/133607—Direct backlight including a specially adapted diffusing, scattering or light controlling members the light controlling member including light directing or refracting elements, e.g. prisms or lenses
    • G—PHYSICS
    • G02—OPTICS
    • G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
    • G02F2202/00—Materials and properties
    • G02F2202/28—Adhesive materials or arrangements

Definitions

  • the present invention relates to a surface protective film.
  • a surface in which an adhesive layer is laminated on one side of a film-like substrate to protect the surface of various members such as optical devices, metal plates, painted metal plates, resin plates, glass plates, etc.
  • Protective films generally called protective tapes, masking tapes, or surface protective sheets
  • surface protective films have recently been used for optical members for liquid crystal displays.
  • Some optical members have an uneven surface, such as a prism sheet or a diffusion film.
  • the surface especially the outer surface of the irregularities
  • a surface protective film is applied to the irregular surface.
  • the surface protection film is industrially manufactured as a wound body obtained by winding a long film in a roll shape. It is known that the surface protection film as such a wound body has a high force (deployment force) necessary for unwinding the wound body, and the deployment force tends to increase with time. There is a strong demand for a small force, that is, the ability to easily rewind the wound body. Further, since the surface protective film is peeled and removed after use, it is required to have smooth peelability and no adherend adherence due to adhesive residue.
  • polar materials such as acrylic resins and polycarbonate resins are frequently used as materials such as prism sheets and diffusion films.
  • These optical sheets are shipped to an optical device manufacturer after a surface protective film is attached, but may be exposed to high temperatures during transportation, storage, and the like.
  • an increase in adhesive force due to an increase in the contact area between the adherend and the adhesive layer due to external factors such as time and temperature, so-called There is a problem of adhesive progress.
  • acrylic pressure-sensitive adhesives are widely used as pressure-sensitive adhesives, but acrylic pressure-sensitive adhesives have a particularly large increase in adhesive strength over time.
  • a rubber-based adhesive is mainly used instead of an acrylic adhesive in the pressure-sensitive adhesive layer constituting the surface protective film.
  • an increase in adhesive force with time is avoided, and the surface protective film is smoothly peeled off from the lens portion (prism) surface of the optical sheet.
  • rubber adhesive is generally a solution-coated type
  • problems such as environmental pollution and energy waste during solvent drying, and the back side of the olefin base material layer (the side on which the adhesive layer is laminated) It is also necessary to perform a mold release process on the opposite surface.
  • it is a hot-melt-type adhesive, the former problem can be eliminated or reduced, but the back surface release treatment cannot be avoided.
  • Patent Document 1 A method for producing a surface protective film in which an electron beam or ⁇ -ray is irradiated on the surface of a film base layer has been proposed (Patent Document 1).
  • a surface layer containing a polyolefin resin and a pressure-sensitive adhesive layer containing a thermoplastic elastomer are laminated and formed by a coextrusion method, and then a release layer is formed on the back surface of the surface layer by a coating method.
  • Patent Document 2 A surface protective film has been proposed (Patent Document 2).
  • the initial adhesive force to the adherend is obtained by mixing polyethyleneimine having a higher alkyl group introduced into the base material layer and bleeding out to the surface of the adhesive layer. Attempts have been made to suppress the adhesion progress while ensuring the above (Patent Document 4).
  • the prism sheets with the surface protective film attached are generally stacked and stored in units of several tens of sheets until they are incorporated into a product.
  • the top of the unevenness of the prism sheet disposed below may be destroyed by the load of the prism sheet disposed above, and the optical quality may deteriorate.
  • the thickness of the pressure-sensitive adhesive layer may be sufficiently increased.
  • Patent Document 5 discloses a surface protective film using a pressure-sensitive adhesive layer having a thickness of 10 ⁇ m or more mainly composed of a styrene-based elastomer. It is described that a sufficient protective function for the adherend and an appropriate adhesive property can be satisfied at the same time.
  • the above prior art still has the following problems. Even with the surface protective film of Patent Document 1 or 3, the developing force cannot be sufficiently reduced only by the back surface treatment, the rewinding property of the wound body is not sufficient, and the workability may be lowered. In the release treatment method of Patent Document 2, sufficient feeding property can be ensured even when the back surface of the substrate is rough, but the release agent is transferred to the adhesive layer, and the adhesiveness to the adherend may be reduced. .
  • the surface protective film disclosed in Patent Document 4 has a case where the amount of polyethyleneimine that bleeds out to the surface is stored in a normal environment when stored in an extremely high temperature environment (for example, a tropical region or a subtropical region).
  • the surface protective film disclosed in Patent Document 5 is applied to a harsh state, for example, in particular, on the prism surface of the prism sheet, and the surface opposite to the prism surface side (that is, the outer surface of the surface protective film). In the case where a projection such as a so-called fish eye is pressed against the surface, there is room for further improvement from the viewpoint of protecting the shape of the top of the irregularities of the prism portion.
  • an object of the present invention is to provide a surface protective film that eliminates the above-mentioned drawbacks of the prior art, has an excellent initial adhesive force, has excellent developability, and prevents adhesive residue after peeling on the adherend. Is to provide.
  • a further object of the present invention is to provide a surface protective film for a prism sheet, in which an adequate initial adhesive force is ensured, and the adhesive progress is suppressed even under an extremely high temperature (eg, 70 ° C.) environment. That is.
  • a further object of the present invention is to be applied to a harsh state, for example, particularly on the surface of the prism sheet that is affixed to the prism surface and opposite to the prism surface (that is, the outer surface of the surface protective film).
  • An object of the present invention is to provide a surface protective film capable of protecting the top and bottom shapes of the prism portions even when a projection such as a so-called fish eye is pressed.
  • the present inventors have used a specific multi-block copolymer having an aromatic alkenyl polymer block and an aromatic alkenyl-conjugated diene copolymer block in the pressure-sensitive adhesive layer.
  • the inventors have found that a surface protective film that is excellent in developability and prevents adhesive residue after peeling from the adherend can be obtained while ensuring adhesive strength, and as a result of further studies, the present invention has been completed.
  • the pressure-sensitive adhesive composition of the present invention is Polymer (i): comprising the following polymer block A and the following polymer block B, represented by the general formula [AB] n (wherein A represents the polymer block A, B represents the polymer block B, and n represents A copolymer (I) having a structure represented by the formula (1) or a hydrogenated product thereof:
  • a copolymer (II) having a structure represented by -Y wherein x represents an integer of 2 or more, Y represents a coupling agent residue, and other symbols are as defined above
  • the overall aromatic alkenyl compound unit content (St (A + B)) of the polymer (i) and the polymer (ii) is 30 to 50% by weight,
  • Polymer block A Polymer block having a series of aromatic alkenyl compound units and mainly consisting of aromatic alkenyl compound units
  • Polymer block B An aromatic alkenyl-conjugated diene copolymer block containing a conjugated diene unit and an aromatic alkenyl compound unit at random, wherein the aromatic alkenyl compound unit content (St (b)) is 10 to 35% by weight.
  • the surface protective film of this invention has a base material layer and the adhesive layer which consists of an adhesive composition of the said this invention.
  • the surface protective film of the present invention has excellent developability and prevents adhesive residue after peeling from the adherend.
  • the substrate layer is a polyolefin substrate layer;
  • the pressure-sensitive adhesive composition further contains a tackifier, and the maximum temperature of tan ⁇ obtained by measuring dynamic viscoelasticity of the pressure-sensitive adhesive layer at ⁇ 50 ° C. to 80 ° C. is ⁇ 10 ° C. to 20 ° C. It is.
  • the said surface protective film can have the further expansion
  • the substrate layer is a polyolefin substrate layer;
  • the pressure-sensitive adhesive composition further contains a tackifier and a styrenic block phase reinforcing agent,
  • the ratio of the weight of the aromatic alkenyl compound unit in the polymer (i), the polymer (ii) and the styrenic block phase reinforcing agent to the weight of the pressure-sensitive adhesive layer (aromatic alkenyl compound unit content) is 20 ⁇ 50% by weight. Thereby, the progress of the adhesive force with time can be further suitably suppressed.
  • the storage elastic modulus G ′ of the pressure-sensitive adhesive layer at 70 ° C. is 4.5 ⁇ 10 5 Pa to 6.0 ⁇ 10 5 Pa.
  • the progress of the adhesive force with time can be further suitably suppressed.
  • the surface protective film when used for protecting the surface of the prism surface of the prism sheet, the surface protective film is affixed to the prism surface and a load of 0.3 N / cm 2 is applied for 24 hours in an atmosphere at 70 ° C.
  • the depth of penetration of the prism apex angle of the prism surface into the adhesive is 1% or more and less than 40% of the thickness of the adhesive layer.
  • a protrusion having a diameter of 400 ⁇ m and a height of 12 ⁇ m is attached to the surface opposite to the prism surface.
  • the depth of penetration of the prism apex angle of the prism surface into the pressure-sensitive adhesive layer when pressed is 1% or more and less than 100% of the pressure-sensitive adhesive layer thickness.
  • the outer surface of the base material layer has a surface roughness Ra of 0.7 to 2.0 ⁇ m, an average height of a swell motif of 3 ⁇ m or more. And an average length of waviness motif of 350 ⁇ m or more and 600 ⁇ m or less.
  • the surface protective film is for protecting the surface of the diffusion film.
  • the surface protective film of the present invention is excellent in developability and prevents adhesive residue after peeling from the adherend. Furthermore, the surface protective film of one embodiment of the present invention has suppressed adhesion progress even in an environment of extremely high temperature (eg, 70 ° C.) while ensuring appropriate initial adhesive strength. Furthermore, the surface protective film of one embodiment of the present invention is applied to a harsh state, for example, the surface of the prism sheet, particularly the surface opposite to the prism surface (that is, the outer surface of the surface protective film). In the case where a projection such as a so-called fish eye is pressed, the shape of the top of the projections and depressions of the prism portion can be protected.
  • FIG. 1 It is a schematic diagram which shows the wave
  • the “content” of the repeating unit of the polymer used in the term “aromatic alkenyl compound unit content” or the like means the weight ratio in terms of the monomer from which the repeating unit is derived, that is, the polymer.
  • the “weight of all monomers for forming the polymer” approximates the weight of the polymer.
  • the “content ratio” of the repeating unit of the polymer block is the weight ratio converted to the monomer from which the repeating unit is derived, that is, the total monomer for forming the polymer block. It means the ratio (% by weight) of the weight of the monomer from which the repeating unit is derived to the weight.
  • the “weight of all monomers for forming the polymer block” approximates the weight of the polymer block.
  • the “vinyl bond content” means the total content of 1,2-vinyl bonds and 3,4-vinyl bonds calculated by the Morero method using an infrared absorption spectrum method.
  • the pressure-sensitive adhesive composition of the present invention contains the following polymer (i) and the following polymer (ii).
  • the “polymer (i)” includes the following polymer block A and the following polymer block B, and is represented by the general formula [AB] n (wherein A represents the polymer block A and B represents The polymer block B is a copolymer (I) having a structure represented by the following formula: n represents an integer of 1 to 3, or a hydrogenated product thereof.
  • the “polymer (ii)” includes the following polymer block A and the following polymer block B, and is represented by the general formula ABA (the symbols in the formula are as defined above) or General formula (AB) xY (wherein x represents an integer of 2 or more, Y represents a coupling agent residue, and other symbols are as defined above). Or a hydrogenated product thereof.
  • a composition comprising the polymer (i) and the polymer (ii) may be simply referred to as a “copolymer composition”.
  • the total aromatic alkenyl compound unit content of the polymer (i) and the polymer (ii) is 30 to 50% by weight
  • the weight ratio of the total amount of the polymer block A and the total amount of the polymer block B contained in the polymer (i) and the polymer (ii) is in the range of 5:95 to 25:75.
  • the “polymer block A” is a polymer block in which aromatic alkenyl compound units are continuous and mainly composed of aromatic alkenyl compound units.
  • polymer block B is an aromatic alkenyl-conjugated diene copolymer block containing a conjugated diene unit and an aromatic alkenyl compound unit at random, and the aromatic alkenyl compound unit content (St (B)) is a polymer block of 10 to 35% by weight.
  • polymer block A is a polymer block in which aromatic alkenyl compound units are continuous and mainly composed of aromatic alkenyl compound units.
  • the “aromatic alkenyl compound unit” is a repeating unit derived from an aromatic alkenyl compound.
  • the “aromatic alkenyl compound” include styrene, tert-butylstyrene, ⁇ -methylstyrene, p-methylstyrene, p-ethylstyrene, divinylbenzene, 1,1-diphenylethylene, vinylnaphthalene, vinylanthracene, N , N-jetyl-p-aminoethylstyrene, vinylpyridine and the like.
  • the “aromatic alkenyl compound unit” is preferably a styrene unit because the raw materials are easily industrially available.
  • Polymer block A needs to be composed of aromatic alkenyl compound units as main repeating units.
  • the aromatic alkenyl compound unit content is 80% by weight or more.
  • the repeating unit other than the aromatic alkenyl compound unit that may be contained in an amount of less than 20% by weight includes a repeating unit derived from a compound copolymerizable with the aromatic alkenyl compound, such as a conjugated diene compound or (meth). Mention may be made of repeating units derived from acrylic ester compounds. Of these, 1,3-butadiene and isoprene are preferred because of their high copolymerizability with aromatic alkenyl compounds.
  • the “polymer block B” is an aromatic alkenyl-conjugated diene copolymer block in which a conjugated diene unit and an aromatic alkenyl compound unit are randomly included, and the aromatic alkenyl compound unit content (St (B)) is a polymer block of 10 to 35% by weight.
  • the “conjugated diene compound unit” constituting the “polymer block B” is a repeating unit derived from a conjugated diene compound.
  • Examples of the “conjugated diene compound” include 1,3-butadiene, isoprene, 2,3-dimethyl-1,3-butadiene, 1,3-pentadiene, 2-methyl-1,3-octadiene, 1,3- Examples include hexadiene, 1,3-cyclohexadiene, 4,5-diethyl-1,3-octadiene, 3-butyl-1,3-octadiene, myrcene, and chloroprene.
  • the “conjugated diene compound unit” is at least one repeating unit selected from the group of 1,3-butadiene units and isoprene units because of high polymerization reactivity and easy availability of raw materials industrially. It is preferable.
  • the “polymer block B” needs to be composed of a conjugated diene compound unit as a main repeating unit. From the viewpoint of exerting the effects of the present invention, the conjugated diene compound unit content is preferably in the range of 65 to 90% by weight.
  • the “polymer block B” needs to have an aromatic alkenyl compound unit content (St (b)) in the range of 10 to 35% by weight, and 13 to 33. It is preferably in the range of wt%, more preferably in the range of 16 to 30 wt%.
  • St (b) aromatic alkenyl compound unit content
  • the “polymer block B” may also contain a repeating unit other than the conjugated diene compound unit and the aromatic alkenyl compound unit as long as the effects of the present invention are not hindered.
  • the “polymer block B” preferably has a vinyl bond content in the range of 50 to 90% and more preferably in the range of 60 to 80% from the viewpoint of exerting the effects of the present invention. preferable. Moreover, there exists an advantage that the adhesive composition excellent in the balance of tack
  • the “copolymer (I)” includes the following polymer block A and the following polymer block B, and is represented by the general formula [AB] n (wherein A is the polymer block A and B is the polymer block B). , N represents an integer of 1 to 3.).
  • n represents an integer of 1 to 3.
  • the structure represented by the formula [AB] n includes, for example, AB, ABAB, And a structure represented by ABABABAB.
  • a and B may be the same or different in repetition.
  • the terminal polymer block B occupies 2% by weight or more of the entire copolymer from the viewpoint of reliably exhibiting the effect of the polymer block B. Even if the terminal of some of the copolymers (I) has a structure of -A, the content of the terminal polymer block A is less than 2% by weight of the entire copolymer (I). Can exhibit the same effect as the terminal being the polymer block B. That is, the structure can be regarded as having a polymer block B at the end.
  • n must be an integer of 1 to 3. Industrial productivity becomes favorable by making n into this range. From the viewpoint of improving the adhesive strength and the material strength, n is more preferably 1 to 2, and particularly preferably 1. That is, as the “copolymer having a structure represented by the general formula [AB] n”, a block copolymer having a structure represented by the general formula AB is particularly preferable.
  • Copolymer (I) or a hydrogenated product thereof preferably has an aromatic alkenyl compound unit content in the range of 30 to 50% by weight, preferably 33 to 45% by weight. More preferred. By setting the aromatic alkenyl compound unit content in this range, it is possible to constitute a pressure-sensitive adhesive composition having an appropriate holding power and followability to the unevenness of the adherend surface, and having excellent spreadability. It becomes possible.
  • the molecular weight of the polymer (i) is not particularly limited, but the weight average molecular weight is preferably 30,000 to 500,000, more preferably 80,000 to 300,000, and 100,000 to 200,000. Is particularly preferred.
  • the weight average molecular weight is preferably 30,000 to 500,000, more preferably 80,000 to 300,000, and 100,000 to 200,000. Is particularly preferred.
  • the polymer (i) and thus the polymer (i) and the copolymer (II) or a hydrogenated product thereof (polymer (ii)) are formed. Industrial production of the copolymer composition can be facilitated.
  • the weight average molecular weight is less than 30,000, the polymer adheres to the production equipment or the like in the step of removing the solvent and drying the polymer, and industrial production of the polymer (i) may be difficult.
  • the weight average molecular weight is 500,000 or more, the solubility in a solvent and the heat melting property are deteriorated, and it may be difficult to process the pressure-sensitive adhesive
  • the double bond derived from the conjugated diene monomer is 80% or more, preferably 90% or more, more preferably 95%.
  • a hydrogenated product in which an unsaturated bond is hydrogenated to a saturated bond by hydrogenation is preferable.
  • the ratio of hydrogenation means a hydrogenation rate calculated from a 270 MHz, 1 H-NMR spectrum using carbon tetrachloride as a solvent.
  • the polymer (i) may be a single type (one type) or a combination of two or more types.
  • the “copolymer (II)” includes the following polymer block A and the following polymer block B, and is represented by the general formula ABA (the symbols in the formula are as defined above) or the general formula (A -B) xY (wherein x represents an integer of 2 or more, Y represents a coupling agent residue, and other symbols are as defined above). It is a copolymer which has a structure represented by these.
  • the copolymer (II) has a polymer block A at all molecular terminals.
  • the terminal polymer block A preferably accounts for 2% by weight or more of the entire copolymer (II). This is to ensure that the effect of the polymer block A is exhibited. Even if the terminal of some of the copolymers (II) has a structure of -B, the content of the terminal polymer block B is less than 2% by weight of the whole copolymer (II). Can exhibit the same effect as that of the polymer block A at the end. That is, the structure can be regarded as having the polymer block A at the end.
  • a structure represented by the general formula (AB) xY (wherein x represents an integer of 2 or more, Y represents a coupling agent residue, and other symbols are as defined above).
  • the copolymer having has a structure in which the copolymer (I) is coupled by Y. Therefore, in the case of (AB) xY, the mixture of (I) and (II) can be synthesized in the same reaction kettle. From the industrial viewpoint, (AB) xY is preferred.
  • x is 3 or more, the copolymer is a so-called star polymer.
  • x is preferably 2 to 4 from the viewpoint of suppressing side reactions during the production of the copolymer and controlling the physical properties of the copolymer.
  • copolymer (II) or a hydrogenated product thereof also has an aromatic alkenyl compound unit content within the range of 30 to 50 weights for the same reason as the polymer (i). It is preferably 33 to 45% by weight.
  • the double bond derived from the conjugated diene monomer is 80% or more, preferably 90% or more, more preferably 95% or more. It is preferable that the unsaturated bond is a hydrogenated product obtained by hydrogenating the saturated bond.
  • the molecular weight of the polymer (ii) is not particularly limited, but the weight average molecular weight is preferably 50,000 to 500,000, and more preferably 50,000 to 300,000. By making the weight average molecular weight in the range of 50,000 to 500,000, industrial production of the polymer (ii), and thus the copolymer composition comprising the polymer (i) and the polymer (ii) can be facilitated. Can be. When the weight average molecular weight is less than 30,000, the polymer adheres to the production equipment in the process of removing the solvent and drying the polymer, making it difficult to industrially produce the copolymer (II) or its hydrogenated product. There is a case.
  • the polymer (ii) may be a single type (one type) or a combination of two or more types.
  • the pressure-sensitive adhesive composition of the present invention is a pressure-sensitive adhesive composition containing a copolymer composition composed of the polymer (i) and the polymer (ii) as a constituent component.
  • the weight ratio of the polymer (i) to the polymer (ii) needs to be in the range of 90:10 to 10:90.
  • the weight ratio of the polymer (i) to the polymer (ii) is preferably in the range of 50:50 to 15:85.
  • the weight ratio of the total amount of the polymer block A and the total amount of the polymer block B contained in the polymer (i) and the polymer (ii) is 5:95 to 25:75. It is necessary to be within the range.
  • by containing 5 parts by weight or more of the polymer block A in 100 parts by weight of the total amount of the polymer block A and the polymer block B it is possible to impart an appropriate holding force to the formed pressure-sensitive adhesive layer. The preferable effect of becoming can be exhibited.
  • the pressure-sensitive adhesive layer to be formed is good against unevenness on the surface of the adherend. Therefore, it is possible to exert a preferable effect that the surface of the adherend can be surely protected.
  • the weight ratio of the total amount of the polymer block A and the total amount of the polymer block B is preferably in the range of 5:95 to 25:75, and more preferably in the range of 7:93 to 23:77. A range of 10:90 to 21:79 is particularly preferable.
  • the surface protective film of this invention has a base material layer and the adhesive layer which consists of an adhesive composition of this invention demonstrated above.
  • the pressure-sensitive adhesive layer is laminated on one surface of the base material layer.
  • the base material layer is preferably a polyolefin base material layer.
  • the “polyolefin” include low density polyethylene, medium density polyethylene, high density polyethylene, linear low density polyethylene, ethylene- ⁇ -olefin copolymer, ethylene-ethyl acrylate copolymer, ethylene-vinyl acetate copolymer. Examples thereof include a copolymer, an ethylene-methyl acrylate copolymer, an ethylene-n-butyl acrylate copolymer, and polypropylene (homopolymer, random copolymer, block copolymer). These can be used alone or in combination of two or more.
  • the “polyolefin” may be a polyolefin having a substituent, and a resin other than the polyolefin may be added. Furthermore, the end material of the polyolefin base material layer and the end material of the surface protection film which were produced in the manufacturing process of the surface protection film may be added.
  • the base material layer may be a single layer or a layer having two or more multilayer structures having different compositions. The thickness of the base material layer can be appropriately adjusted depending on the use of the surface protective film. Usually, a thickness of about 10 to 100 ⁇ m is suitable.
  • the outer surface of the base material layer (that is, the surface opposite to the pressure-sensitive adhesive layer side) has a surface roughness Ra of 0.7 to 2.0 ⁇ m, a waviness motif average height of 3 ⁇ m or more, and 350 ⁇ m.
  • the swell motif average length is 600 ⁇ m or less.
  • the surface roughness of the back surface of the base material layer, the waviness motif average height, and the waviness motif average length are in the predetermined range, and a plurality of prism sheets with a surface protective film attached thereon are stored in a stacked manner. Even if there is a minute biting foreign matter, the fine biting foreign matter can enter the undulation valley of the surface, so the stress concentrated on the lens part of the prism sheet is greater than when the surface is smooth. It is thought that it can be reduced.
  • surface roughness Ra is “arithmetic average height” defined in JIS B0601: 2001.
  • the average swell motif height W is calculated as the average value of Wj in the schematic diagram showing the swell of the polyolefin substrate layer surface of FIG. 2, and the average swell motif length AW is calculated as the average value of AWj by the following formula. Is done.
  • “average swell motif length” and “average swell motif height” are “average length of contour curve element” and “average height of contour curve element” defined in JIS B0601: 2001, respectively. Is.
  • the said adhesive layer consists of an adhesive composition of this invention.
  • the pressure-sensitive adhesive composition includes a tackifier, a styrene block phase reinforcing agent, a softening agent, an antioxidant, and a light stabilizer, as necessary.
  • UV absorbers, fillers, pigments, adhesion promoters, olefin resins, silicone polymers, liquid acrylic copolymers, phosphate ester compounds, and the like may be contained as appropriate.
  • tackifier used in the present invention examples include petroleum resins such as aliphatic copolymers, aromatic copolymers, aliphatic / aromatic copolymers and alicyclic copolymers, Generally adhesives such as coumarone-indene resin, terpene resin, terpene-phenol resin, polymerized rosin resin such as rosin, (alkyl) phenol resin, xylene resin or hydrogenated products thereof What is used for can be used without a restriction
  • a hydrogenated tackifier In order to improve peelability and weather resistance, it is more preferable to use a hydrogenated tackifier. Moreover, you may use the tackifier marketed as a blend with an olefin resin.
  • the tackifier in the present invention means a compound that is compatible with a rubber layer that is a conjugated diene system or a hydrogenated soft segment thereof in an aromatic alkenyl block copolymer and can control the adhesive force. .
  • “Compatible” means that the tan ⁇ peak temperature of a blend obtained by blending a tackifier with the copolymer composition is different from the tan ⁇ peak temperature of the copolymer composition. That means.
  • tan ⁇ peak temperature means a temperature at which tan ⁇ is maximized.
  • the styrenic block phase reinforcing agent is used to suppress the adhesion progress of the adhesive layer.
  • the styrenic block phase reinforcing agent used in the present invention include, as monomer units, styrene and ⁇ -methylstyrene, p-methylstyrene, p-chlorostyrene, chloromethylstyrene, tert-butylstyrene, and p-ethylstyrene.
  • styrenic compounds such as divinylbenzene. These can be used alone or in combination of two or more. That is, the styrenic block phase reinforcing agent can be obtained by polymerizing these monomers.
  • the styrenic block phase reinforcing agent preferably has a softening point of about 100 ° C. or higher, and more preferably 150 ° C. or higher.
  • trade names “ENDEX 155” (softening point 155 ° C.), “ENDEX 160” (softening point 160 ° C.) manufactured by Eastman Chemical Co., Ltd. are preferably used.
  • Softeners are usually effective in improving adhesive strength.
  • the softener include low molecular weight diene polymer, polyisobutylene, hydrogenated polyisoprene, hydrogenated polybutadiene, paraffinic process oil, naphthenic process oil, aromatic process oil, castor oil, tall oil, natural oil, What is generally used for an adhesive, such as liquid polyisobutylene resin, polybutene, or hydrogenated products thereof, can be used without any particular limitation. These softeners may be used alone or in combination of two or more.
  • the antioxidant is not particularly limited, and examples thereof include commonly used ones such as phenolic (monophenolic, bisphenolic, and polymeric phenolic), sulfur, and phosphorus.
  • Examples of the light stabilizer include hindered amine compounds.
  • the ultraviolet absorber is not particularly limited, and examples thereof include salicylic acid series, benzophenone series, benzotriazole series, and cyanoacrylate series.
  • Examples of the filler include calcium carbonate, magnesium carbonate, silica, zinc oxide, and titanium oxide.
  • Examples of the anti-adhesive agent include fatty acid amides, polyethyleneimine long-chain alkyl grafts, soybean oil-modified alkyd resins (for example, Arakawa Chemical Industries, trade name “Arachid 251”, etc.), tall oil-modified alkyd resins (for example, Arakawa Chemical Industries, trade name “Arachid 6300”, etc.). These additives may be used alone or in combination of two or more.
  • the thickness of the pressure-sensitive adhesive layer is not particularly limited, but is usually about 0.5 to 50 ⁇ m, preferably 1 to 40 ⁇ m, more preferably 2 to 30 ⁇ m.
  • the substrate layer is a polyolefin substrate layer;
  • the pressure-sensitive adhesive composition further contains a tackifier, and the maximum temperature of tan ⁇ obtained by measuring dynamic viscoelasticity of the pressure-sensitive adhesive layer at ⁇ 50 ° C. to 80 ° C. is ⁇ 10 ° C. to 20 ° C. It is.
  • the tackifier those exemplified above can be used. It is suitable to use the tackifier in an amount that can prevent adhesive residue when the surface protective film is peeled off from the adherend.
  • the compounding ratio of the tackifier is a rubber-based resin component [the polymer (i) and the polymer (ii) (hereinafter collectively referred to as these). May be referred to as an aromatic alkenyl block copolymer.)]
  • the amount is preferably 5 to 50 parts by weight, more preferably 10 to 40 parts by weight per 100 parts by weight.
  • the tan ⁇ peak temperature obtained by measuring the dynamic viscoelasticity of the pressure-sensitive adhesive layer at ⁇ 50 ° C. to 80 ° C. is preferably in the range of ⁇ 10 ° C. to 20 ° C.
  • the tan ⁇ peak temperature adjusts the rubber-based resin component in the pressure-sensitive adhesive layer, for example, the range of the aromatic alkenyl compound unit content in the random block of the aromatic alkenyl block copolymer, the blending ratio of the tackifier, and the like. Or it can adjust to a preferable range by selecting the tackifier to use in consideration of softening temperature etc.
  • Viscoelastic spectrometer Trade name “DVA-200” (made by IT Measurement & Control) Sample size of the pressure-sensitive adhesive layer: thickness of about 1.5 mm ⁇ 5 mm ⁇ 10 mm Set temperature rise rate: 6 ° C / min Measurement frequency: 10Hz Measurement mode: shear
  • the cohesive force of the pressure-sensitive adhesive layer can be improved in combination with the action of the tackifier.
  • the surface protection film can be easily peeled from the back surface of the base material layer. That is, the wound body can be rewound without difficulty.
  • the irregularities can be followed, and the surface protection of the adherend can be ensured.
  • the substrate layer is a polyolefin substrate layer;
  • the pressure-sensitive adhesive composition further contains a tackifier and a styrenic block phase reinforcing agent, and the polymer (i) and the aromatic alkenyl compound unit in the polymer (ii) and the styrenic block phase reinforcing agent.
  • the ratio of the weight to the weight of the pressure-sensitive adhesive layer (aromatic alkenyl compound unit content) is 20 to 50% by weight. When the proportion is less than 20% by weight, the adhesive strength with time may be easily increased, and when the proportion exceeds 50% by weight, high adhesive strength may not be obtained.
  • tackifier those exemplified above can be used.
  • the tackifier is preferably used in an amount that can prevent adhesive residue when the surface protective film is peeled off from the adherend.
  • the tackifier is preferably contained in an amount of about 5 to 50 parts by weight, more preferably 10 parts by weight to 100 parts by weight of the rubber-based resin component (aromatic alkenyl block copolymer). About 40 parts by weight.
  • the styrene block phase reinforcing agent is, for example, preferably blended in an amount of about 40 parts by weight or less, more preferably about 30 parts by weight or less based on 100 parts by weight of the aromatic alkenyl block copolymer. Moreover, although it should just be mix
  • styrene block phase reinforcing agent By using a styrene block phase reinforcing agent, it is compatible with the styrene (St) phase in the styrene copolymer block, and the cohesive force of the pressure-sensitive adhesive layer can be improved. Thereby, the surface protective film adhered from the back surface of the polyolefin base material layer can be easily peeled off, and the wound body can be easily rewound. Moreover, the adhesive residue at the time of peeling a surface protection film from a to-be-adhered body can be prevented, and it becomes possible to peel with a comparatively small force.
  • the storage elastic modulus G ′ at 70 ° C. of the pressure-sensitive adhesive layer is preferably 4.5 ⁇ 10 5 Pa to 6.0 ⁇ 10 5 Pa.
  • the storage elastic modulus G ′ is 4.5 ⁇ 10 5 Pa or more, undesirable adhesion progress is suppressed even in a high temperature environment, while the storage elastic modulus G ′ is 6.0 ⁇ 10 5 Pa or less.
  • appropriate adhesive strength can be obtained.
  • the cohesive strength of the aromatic alkenyl block copolymer is adjusted by adjusting the aromatic alkenyl compound unit content of the pressure-sensitive adhesive layer in the surface protective film of the present invention. It may be within an appropriate range.
  • the content can be adjusted by using an aromatic alkenyl block copolymer having a content of a component derived from an appropriate aromatic alkenyl monomer and / or adding a styrenic block phase reinforcing agent to the pressure-sensitive adhesive layer.
  • the styrenic block phase reinforcing agent is an agent that reinforces the island phase of the sea-island structure formed by the aromatic alkenyl block copolymer, and has a property of being compatible with the domain made of the aromatic alkenyl block copolymer.
  • the amount of the styrenic block phase reinforcing agent used is preferably 40 parts by weight or less, more preferably 30 parts by weight or less, based on 100 parts by weight of the aromatic alkenyl block copolymer.
  • the lower limit of the amount used is not particularly limited, and when there is no need to adjust the aromatic alkenyl compound unit content as described above, addition is unnecessary, but it is preferably 1 part by weight or more.
  • the surface protective film of the present invention is for protecting the surface of the prism surface of the prism sheet, and is affixed to the prism surface and is 0.3 N / cm 2 under an atmosphere of 70 ° C.
  • the depth of penetration of the prism apex angle of the prism surface into the adhesive when the load is applied for 24 hours is 1% or more and less than 40% of the thickness of the adhesive layer.
  • the bite depth is measured by the following method.
  • the surface protection film to be tested is attached to the surface of the prism sheet at a speed of 300 mm / min using a 2 kg pressure rubber roller in an environment of a room temperature of 23 ° C. and a relative humidity of 50%.
  • a prism sheet having a prism center distance of 50 ⁇ m and a height of 25 ⁇ m is used. Thereafter, a prism sheet with a surface protective film attached is sandwiched between polycarbonate plates (thickness 2 mm), a pressure of 0.3 N / cm 2 is applied, and the mixture is allowed to stand in an environment of 70 ° C. for 24 hours. Thereafter, the surface protective film is peeled off at a peeling angle of 180 degrees, the surface of the pressure-sensitive adhesive layer is observed with a laser microscope, and the depth of biting into the pressure-sensitive adhesive layer at the apex angle of the lens portion (prism) of the prism sheet is measured.
  • the surface protective film of the present invention is for protecting the prism surface of the prism sheet, Depth of biting into the pressure-sensitive adhesive layer of the prism apex angle of the prism surface when a projection having a diameter of 400 ⁇ m and a height of 12 ⁇ m is pressed against the surface opposite to the prism surface side. Is not less than 1% and less than 100% of the thickness of the pressure-sensitive adhesive layer.
  • the condition for pressing the protrusion is preferably 24 hours with a force of 0.8 N / cm 2 in an atmosphere of 50 ° C.
  • the upper limit of the biting depth is similarly predicted to be less than 100% of the pressure-sensitive adhesive layer thickness. Therefore, when the surface protective film of the present invention is affixed to the prism sheet and another surface protective film is affixed to the smooth sheet surface, for example, when several tens of prism sheets are stacked and stored, the smooth sheet surface Even if there are protrusions such as FE and biting foreign matter in the surface protective film, the aromatic alkenyl compound unit content of the adhesive in the adhesive layer of the surface protective film is set to an appropriate amount.
  • the agent layer becomes hard, and excessive biting of the lens portion of the prism sheet into the pressure-sensitive adhesive layer of the surface protective film is surely suppressed. Thereby, the lens surface (prism surface) of the prism sheet is hardly damaged.
  • Making the penetration depth 1% or more and less than 100% of the thickness of the pressure-sensitive adhesive layer is mainly because the aromatic alkenyl compound unit content of the aromatic alkenyl block copolymer is 30 to 50% by weight, Has been achieved. If this content is less than 30% by weight, the cohesive force of the pressure-sensitive adhesive is low, so that the depth of biting into the pressure-sensitive adhesive layer of the prism lens may not be suppressed.
  • this content exceeds 50% by weight, the cohesive force of the pressure-sensitive adhesive is too high, and the prism lens is difficult to bite into the pressure-sensitive adhesive layer, and the pressure-sensitive adhesive force becomes too low, so that it can be used as a protective film. It may not be possible.
  • the lens portion of the prism sheet to which the surface protective film of the present invention is applied has a prism shape substantially consisting of a triangular prism.
  • a surface having such a prism-shaped lens portion is referred to as a prism surface.
  • the prism sheet 1 has a structure in which a plurality of triangular prism-shaped lens portions 3 are integrated on one surface of a flat sheet 2.
  • the lens unit 3 has a substantially triangular prism shape. A plurality of lens portions 3 are closely arranged in parallel so that the ridge lines of the triangular prism are parallel to each other.
  • the outer surface of the prism-shaped lens portion 3 is protected by the surface protective film of the present invention.
  • the first surface protective film 4 (surface protective film of the present invention) is affixed to the portion of the prism sheet 1 where the lens portion 3 is provided.
  • the first surface protective film 4 has a base material layer 5 and an adhesive layer 6 provided on one surface of the base material layer 5, and the plurality of lenses of the prism sheet 1 from the adhesive layer 6 side. It is affixed to the side where the part 3 is provided. Therefore, the surface protective film of the present invention is stuck so as to be in contact with the plurality of apexes 3 a of the triangular prism-shaped lens unit 3.
  • the cross-sectional shape of the lens portion 3 of this triangular prism is a triangle, but this triangle is preferably an isosceles triangle with the side fixed to the sheet as the base.
  • a second surface protective film 7 is attached to the flat surface of the prism sheet 1 opposite to the side on which the lens portion 3 is provided, if desired. If projections such as fish eyes (FE) or biting foreign matter are present on the surface protective film 7, it may cause damage to the top of the lens portion.
  • FE fish eyes
  • the side surface in the prism shape of a triangular prism shall mean the three side surfaces extended in the length direction of a triangular prism.
  • the distance between adjacent prisms that is, the pitch of the prisms is approximately 10 to 1000 ⁇ m, in a plurality of substantially prismatic prisms. More preferably, the thickness is 10 to 500 ⁇ m, but the adherend to which the surface protective film of the present invention is applied is not limited thereto.
  • copolymer (I) and copolymer (II) are synthesized by block polymerization, blended at a predetermined mass ratio, and then hydrogenated as desired.
  • Copolymer (I) or a hydrogenated product thereof, and a mixture of copolymer (I) or the hydrogenated product thereof, and an additive to be blended if desired is mixed by a conventional method .
  • the hydrogenation catalyst a compound containing any one of Group Ib, IVb, Vb, VIb, VIIb, and Group VIII metals can be used.
  • Examples thereof include compounds containing Ti, V, Co, Ni, Zr, Ru, Rh, Pd, Hf, Re, and Pt atoms, and more specifically, Ti, Zr, Hf, Co, Ni, Rh.
  • metallocene compounds such as Ru, and supported heterogeneous catalysts in which metals such as pd, Ni, Pt, Rh and Ru are supported on a support such as carbon, silica, alumina, diatomaceous earth, and basic activated carbon. it can.
  • Specific examples of the metallocene compounds include a Kaminsky catalyst having two ligands in which hydrogen on the cyclopentagenyl ring (Cp ring) or Cp ring is substituted with an alkyl group, and ansa.
  • Examples thereof include a type metallocene catalyst, a non-crosslinked half metallocene catalyst, and a crosslinked half metallocene catalyst.
  • Specific examples include JP-A-1-275605, JP-A-5-271326, JP-A-5-271325, JP-A-5-222115, JP-A-11-292924, and JP-A-11-292924.
  • the catalyst described in Japanese Patent Publication No. 47-40473 can be given. These various catalysts may be used alone or in combination of two or more.
  • the pressure-sensitive adhesive of the present invention may be produced by the following method (coupling method).
  • coupling method copolymer (I) or a hydrogenated product thereof (polymer (i)) and copolymer (II) or a hydrogenated product thereof (polymer (ii)) can be synthesized in one pot. Therefore, the production process is simple, the production cost is low, and the ratio of the polymer (i) to the polymer (ii) can be controlled by the kind and amount of the coupling agent.
  • the coupling method is First step: synthesizing a copolymer having the structure of [AB] by block polymerization; Second step: A part of the copolymer having the structure [AB] is converted into a coupling agent YZ x (where “Y” is a coupling agent residue, “Z” is a leaving group, “X” represents an integer of 2 or more.) To synthesize a copolymer having a structure of ⁇ [AB] x —Y ⁇ , When obtaining a hydrogenated product, Third step: Hydrogenation of the copolymer having the structure [AB] and the copolymer having the structure ⁇ [AB] x -Y ⁇ to form hydrogenated copolymer And a step of obtaining a copolymer composition comprising the combination (I) and the copolymer (II).
  • Examples of the “coupling agent” include methyldichlorosilane, dimethyldichlorosilane, methyltrichlorosilane, butyltrichlorosilane, tetrachlorosilane, dibromoethane, tetrachlorotin, butyltrichlorotin, tetrachlorogermanium, bis (trichlorosilyl) ethane.
  • Halogen compounds such as epoxidized soybean oil; carbonyl compounds such as diethyl adipate, dimethyl adipate, dimethyl terephthalic acid and diethyl terephthalic acid; polyvinyl compounds such as divinylbenzene; polyisocyanates; .
  • methyldichlorosilane, dimethyldichlorosilane, methyltrichlorosilane, and tetrachlorosilane are preferred because they are easily industrially available and have high reactivity.
  • the surface protective film of the present invention is, for example, a method in which a base sheet (base layer) is produced by extrusion molding and then a liquid obtained by melting or dissolving the pressure-sensitive adhesive composition is applied or sprayed on the base sheet, or
  • the base material sheet obtained by the inflation method and the pressure-sensitive adhesive sheet can be bonded together, or the base material and the pressure-sensitive adhesive composition can be coextruded using a T die having a multilayer manifold.
  • the method of manufacturing by coextrusion is preferable.
  • a liquid obtained by melting or dissolving the pressure-sensitive adhesive composition of the present invention is also included in the pressure-sensitive adhesive composition of the present invention.
  • the surface protective film of the present invention can be suitably used for an uneven adherend such as an optical plate, a prism sheet, and a diffusion film, but is not limited to this, for example, a sheet having a smooth surface It can also be used for surface protection. Although it does not specifically limit as a material which comprises the sheet
  • Polymer block A A nitrogen-substituted reaction vessel is charged with 500 parts by mass of degassed and dehydrated cyclohexane, 20 parts by mass of styrene and 5 parts by mass of tetrahydrofuran, and 0.13 parts by mass of n-butyllithium is added at a polymerization start temperature of 40 ° C. Then, temperature rising polymerization was performed.
  • Polymer block B After the polymerization conversion rate of the polymer A reached approximately 100%, the reaction solution was cooled to 15 ° C., and then 70 parts by mass of 1,3-butadiene and 10 parts by mass of styrene were added, followed by further temperature rising polymerization. .
  • a partially extracted polymer had a vinyl content of 64%, a weight average molecular weight of about 110,000, and a coupling rate of 60%.
  • St (A + B) (aromatic alkenyl compound unit weight in all polymers) / (total monomer unit weight in all polymers) ⁇ 100 (% by weight) “St (B)” means a numerical value represented by the following equation.
  • St (B) (aromatic alkenyl compound unit weight in all polymer blocks B) / (total monomer unit weight in all polymers) ⁇ 100 (% by weight) “St (A)” means a numerical value represented by the following formula.
  • St (A) (aromatic alkenyl compound unit weight in all polymer blocks A) / (total monomer unit weight in all polymers) ⁇ 100 (% by weight)
  • St (b) is the aromatic alkenyl compound unit content of the polymer block B, and means a numerical value represented by the following formula.
  • St (b) (aromatic alkenyl compound unit weight in all polymer blocks B) / (total monomer unit weight in all polymer blocks B) ⁇ 100 (% by weight)
  • A: B represents a weight ratio between the total amount of the polymer block A and the total amount of the polymer block B.
  • (i) :( ii) represents the weight ratio of the polymer (i) to the polymer (ii).
  • conjugated diene content represents the conjugated diene unit content of the polymer block B.
  • Vinyl bond content represents the vinyl bond content of the polymer block B.
  • Examples 1 to 8, Comparative Examples 1 to 7 100 parts by weight of each copolymer composition (Table 2) obtained by the above synthesis methods, 30 parts by weight of Alcon P100 (manufactured by Arakawa Chemical Industries) as a tackifier, and Irganox 1010 as an antioxidant 1 weight part (made by Ciba Specialty Chemicals) was mix
  • the composition is shown in Table 2 below.
  • Polypropylene (J715M manufactured by Prime Polymer Co., Ltd.) is used as the base material, and the base material and each pressure-sensitive adhesive composition are coextruded by the T-die method, so that the base material layer has a thickness of 34 ⁇ m and the pressure-sensitive adhesive layer has a thickness of 6 ⁇ m.
  • the surface protective films of Examples 1 to 8 and Comparative Examples 1 to 7 were laminated and integrated to obtain a wound body wound around a paper core having an inner diameter of 3 inches.
  • the 180 degree peel strength at 25 mm width was measured at a speed of 300 mm / min.
  • the peeling direction at this time was the ridge line direction of the prism.
  • the peel strength measured in this manner was taken as the initial adhesive strength.
  • (3) Adhesive strength with time Each surface protective film was used in an environment of a room temperature of 23 ° C. and a relative humidity of 50% using a 2 kg pressure-bonded rubber roller on the surface of the prism sheet used for the initial adhesive strength evaluation in (2). Affixed at a speed of 300 mm / min.
  • Rate of change (adhesive force with time / initial adhesive force) ⁇ 100 (4) Unfolding force Except for changing the unwinding speed of the 50 mm-wide wound bodies of the surface protective films of the examples and comparative examples, the unwinding force was applied at a unwinding speed of 15 m / min in accordance with JIS Z0237. Measured and used as deployment force.
  • Example 9 100 parts by weight of the copolymer composition of Synthesis Example 4, 18 parts by weight of Alcon P100 (Arakawa Chemical Industries) as a tackifier, and 1 part by weight of Irganox 1010 (manufactured by Ciba Specialty Chemicals) as an antioxidant Then, 0.5 part by weight of Tinuvin 326 (manufactured by Ciba Specialty Chemicals) was blended as an ultraviolet absorber and kneaded to obtain a pressure-sensitive adhesive composition.
  • Alcon P100 Alcon P100
  • Irganox 1010 manufactured by Ciba Specialty Chemicals
  • Tinuvin 326 manufactured by Ciba Specialty Chemicals
  • Polypropylene (J715M manufactured by Prime Polymer Co., Ltd.) is used as the base material, and the base material and the pressure-sensitive adhesive composition are coextruded by the T-die method, so that the base material layer having a thickness of 34 ⁇ m and the pressure-sensitive adhesive layer having a thickness of 6 ⁇ m A surface protection film was formed by laminating and integrating, and a wound body wound around a paper core having an inner diameter of 3 inches was obtained.
  • Example 10 (Examples 10, 11, and 13 and Comparative Examples 8 to 10) As shown in Table 4, the pressure-sensitive adhesive composition was blended, and a wound body of the surface protective film was obtained in the same manner as in Example 9.
  • Example 12 In the same manner as in Example 9, except that 100 parts by weight of the copolymer composition of Synthesis Example 7 and 40 parts by weight of Clearon P125 (manufactured by Yasuhara Chemical Co., Ltd.) as a tackifier were used. A wound body of the surface protective film was obtained.
  • the viscoelastic spectrum of the pressure-sensitive adhesive layer is ⁇ 50 at a frequency of 10 Hz and a temperature rising rate of 6 ° C./min using a dynamic viscoelastic spectrum measuring apparatus (product number: DVA-200, manufactured by IT Measurement Control Co., Ltd.). The temperature was measured in the range of 80 ° C. to 80 ° C., and the temperature at which tan ⁇ was maximized (tan ⁇ peak temperature) was determined.
  • Adhesive layer 100 parts by weight of the copolymer composition of Synthesis Example 4, 50 parts by weight of Alcon P100 (manufactured by Arakawa Chemical Industries) as a tackifier, and 10 parts by weight of ENDEX 155 (manufactured by Eastman Chemical) as a styrene block phase reinforcing agent 1 part by weight of Irganox 1010 (manufactured by Ciba Specialty Chemicals) as an antioxidant was mixed and kneaded to obtain a pressure-sensitive adhesive composition.
  • Alcon P100 manufactured by Arakawa Chemical Industries
  • ENDEX 155 manufactured by Eastman Chemical
  • Irganox 1010 manufactured by Ciba Specialty Chemicals
  • Base material layer A base material made of polypropylene (J715M manufactured by Prime Polymer Co., Ltd.) and the pressure-sensitive adhesive composition obtained above were coextruded by a T-die method, and a 34 ⁇ m-thick polypropylene base material layer and a 6 ⁇ m-thick pressure-sensitive adhesive were laminated.
  • the integrated surface protective adhesive sheet was wound around a paper core having an inner diameter of 3 inches to obtain a wound body.
  • Example 6 (Examples 15 to 19, Comparative Examples 11 to 14) As shown in Table 6 below, the pressure-sensitive adhesive composition was blended, and a wound body of the surface protective film was obtained in the same manner as in Example 14.
  • St / adhesive layer (% by weight) is the ratio of the total weight of the aromatic alkenyl compound units of the copolymer composition and the styrenic block phase reinforcing agent to the weight of the adhesive ( Aromatic alkenyl compound unit content).
  • “St / adhesive layer (—TF) (% by weight)” is the total weight of the copolymer composition and the styrene block phase reinforcing agent relative to the total weight of the copolymer composition and the styrene block phase reinforcing agent. The ratio of the total weight of the aromatic alkenyl units is shown.
  • the viscoelastic spectrum of the pressure-sensitive adhesive layer is ⁇ 50 at a frequency of 10 Hz and a temperature rising rate of 6 ° C./min using a dynamic viscoelastic spectrum measuring apparatus (product number: DVA-200, manufactured by IT Measurement Control Co., Ltd.). The temperature was measured in the range of 80 ° C. to 80 ° C., and the temperature at which the maximum tan ⁇ was obtained.
  • the peeling direction at this time was the ridge line direction of the prism.
  • the peel strength measured in this manner was taken as the initial adhesive strength.
  • (3) Adhesive strength with time Each surface protective film was used in an environment of a room temperature of 23 ° C. and a relative humidity of 50% using a 2 kg pressure-bonded rubber roller on the surface of the prism sheet used for the initial adhesive strength evaluation in (2). Affixed at a speed of 300 mm / min. Thereafter, a prism sheet with a surface protective film attached thereto is sandwiched between polycarbonate plates (thickness 2 mm), a pressure of 6.0 ⁇ 10 ⁇ 3 MPa is applied, and in this state, the environment is 60 ° C. and a relative humidity of 90% for 48 hours. I left it alone.
  • Unfolding force A high-speed unwinding force at a rewinding speed of 20 m / min, in accordance with JIS Z0237, except that the unwinding speed was changed for the wound bodies with a width of 50 mm of the surface protective films of the examples and comparative examples. was measured as the deployment force.
  • Example 20 Coextruded by the T-die method to form a surface protection film (width 700 mm) for a prism sheet with a base material layer (thickness 34 ⁇ m) / adhesive layer (thickness 6 ⁇ m) to obtain a wound body having a winding length of 100 m It was.
  • the material for forming the pressure-sensitive adhesive layer is 30 parts by weight of an alicyclic saturated petroleum resin Alcon P125 (manufactured by Arakawa Chemical Industries, Ltd.) having a softening point of 125 ° C. as a tackifier in 100 parts by weight of the copolymer composition of Synthesis Example 13.
  • the material for forming the base material layer includes 100 parts by weight of block PP and 100 parts by weight of a film (block polypropylene (block PP) as the base material), and the copolymer composition of Synthesis Example 13 as the pressure sensitive adhesive layer.
  • Alcon P125 made by Arakawa Chemical Industries
  • ENDEX 155 made by Eastman Chemical Co.
  • Irganox 1010 Ciba Specialty Chemicals
  • Tinuvin 326 manufactured by Ciba Specialty Chemicals
  • Example 8 Except for changing the amount of tackifier and the amount of styrenic block phase reinforcing agent (may be abbreviated as St block reinforcing agent in this specification) as shown in Table 8 below.
  • St block reinforcing agent may be abbreviated as St block reinforcing agent in this specification.
  • a wound body of a surface protective film for a prism sheet was obtained in the same manner as in Example 20.
  • “St / adhesive (% by weight)” in Table 8 is the ratio of the total weight of aromatic alkenyl units of the copolymer composition and the styrene block phase reinforcing agent to the weight of the adhesive (aromatic Alkenyl compound unit content).
  • Storage elastic modulus G ′ The storage elastic modulus of the pressure-sensitive adhesive layer is in the range of ⁇ 50 ° C. to + 150 ° C. at a frequency of 1 Hz and a temperature increase rate of 3 ° C./min using a dynamic viscoelastic spectrum measuring device (product number: DVA200 manufactured by IT Measurement Control Co., Ltd.). The storage elastic modulus G ′ at 70 ° C. was determined.
  • the surface protective film was affixed to the surface of the prism sheet at a speed of 300 mm / min using a 2 kg pressure rubber roller in an environment of a room temperature of 23 ° C. and a relative humidity of 50%.
  • a prism sheet having a prism pitch of 50 ⁇ m and a height of 30 ⁇ m was used. Thereafter, a prism sheet with a surface protective film attached thereto was sandwiched between polycarbonate plates (thickness 2 mm), a pressure of 0.3 N / cm 2 was applied, and the mixture was allowed to stand in an environment of 70 ° C. for 24 hours.
  • Encroachment (%) (Depth of biting into the pressure-sensitive adhesive layer of the lens portion of the prism sheet) / (pressure-sensitive adhesive layer thickness: 6 ⁇ m) ⁇ 100
  • Example 26 As shown in Table 10 below, 100 parts by weight of the copolymer composition of Synthesis Example 14 was mixed with 30 parts by weight of Alcon P-125 (manufactured by Arakawa Chemical Industries), which is an alicyclic saturated petroleum resin as a tackifier. This was added to obtain a pressure-sensitive adhesive composition. On the other hand, a pressure-sensitive adhesive layer made of the above pressure-sensitive adhesive composition, a base material made of a resin composition containing 75 parts by weight of block polypropylene (block PP) shown in Table 10 and 25 parts by weight of low-density polyethylene (LDPE).
  • block PP block polypropylene
  • the surface protective film was co-extruded by a T-die method, and a 40 ⁇ m thick polypropylene base material and a 6 ⁇ m thick adhesive layer were laminated and integrated.
  • Examples 27 to 28 and Comparative Examples 15 to 19 A surface protective film was prepared and evaluated in the same manner as in Example 25 except that the composition and thickness of the pressure-sensitive adhesive layer were changed as shown in Table 10 below. All tackifiers were Alcon P-125. In Comparative Example 18, the film formability was poor.
  • the deployment force was measured and evaluated as follows. The results are shown in Table 11 below. 1) Encroaching amount The surface protective film obtained above was attached so that the pressure-sensitive adhesive layer surface thereof was in contact with the lens surface of the prism sheet, to prepare a test piece. A prism sheet (BEF, Sumitomo 3M) having a lens portion made of acrylic resin, a sheet made of polyethylene terephthalate having a thickness of 150 ⁇ m, a prism pitch of 50 ⁇ m, and a height of 23 ⁇ m was prepared.
  • BEF Sumitomo 3M
  • a nylon fiber having a diameter of 0.2 mm was cut into a length of 11 to 13 ⁇ m by a cryomicrotome, and a cut piece obtained on a slide glass was fixed.
  • the cut piece was fixed between the slide glass and the surface protective film by sticking the surface protective film obtained above to the slide glass with a 2 kg roller.
  • the resulting convex shape (that is, the protrusion) was observed with a laser microscope, and its diameter and height were determined. The diameter and height of the convex shape used for evaluation are shown below.
  • Diameter 400 ⁇ m Height: 12 ⁇ m
  • Adhesive strength over time (against the prism surface)
  • the obtained surface protective film was applied to the surface of the prism sheet used in the initial adhesive strength evaluation of 2) under the conditions of pressure 5.9 ⁇ 10 5 Pa and speed 2 m / min, as in 1).
  • 180 degree peel strength at 25 mm width was measured at a peel speed of 300 mm / min in accordance with JIS Z0237.
  • the peel strength measured in this manner was taken as the adhesive strength with time, and the change rate (adhesion progress rate) of the adhesive strength with time was calculated from the initial adhesive strength (against the prism surface, peeling speed 300 mm / min) by the following equation.
  • Example 29 Coextruded by the T-die method to form a surface protection film (width 700 mm) for a prism sheet with a base material layer (thickness 34 ⁇ m) / adhesive layer (thickness 6 ⁇ m) to obtain a wound body having a winding length of 100 m It was.
  • a material for forming the pressure-sensitive adhesive layer 100 parts by weight of the copolymer composition of Synthesis Example 13 and 30 parts by weight of an alicyclic saturated petroleum resin Alcon P125 (manufactured by Arakawa Chemical Industries) having a softening point of 125 ° C. as a tackifier.
  • the material for forming the base material layer includes 75 parts by weight of block PP, 25 parts by weight of low density polyethylene (LDPR), and a part where both ends of the film are trimmed to adjust the roll shape during film forming (as the base material) 100 parts by weight of block polypropylene (block PP), and 100 parts by weight of the copolymer composition of Synthesis Example 13 as an adhesive, 30 parts of Alcon P125 (manufactured by Arakawa Chemical Industries) as a tackifier, and styrene 20 parts by weight of ENDEX155 (manufactured by Eastman Chemical Co., Ltd.) as a block phase reinforcing agent, 1 part by weight of Irganox 1010 (manufactured by Ciba Specialty Chemicals) as an antioxidant, and Tinuvin 326 (manufactured by Ciba Specialty Chemicals Co., Ltd.) as an ultraviolet absorber ) 0.5 parts by weight) 10 parts by weight mixed Thereafter, the mixture was k
  • “St / adhesive (% by weight)” is the ratio of the total weight of the aromatic alkenyl compound units of the copolymer composition and the styrene block phase reinforcing agent to the weight of the adhesive (aromatic alkenyl). Compound unit content).
  • Examples 30 to 31, Comparative Examples 20 to 22 As shown in Table 12 below, the amount and type of polyolefin in the base layer, the pressure-sensitive adhesive layer, the copolymer composition, the amount of styrene, the amount of tackifier, and the styrenic block phase reinforcing agent (that is, St block) A wound body of the surface protective film for a prism sheet was obtained in the same manner as in Example 29 except that the amount of the reinforcing agent was changed.
  • Time-lapse deployment force conforms to JIS Z0237 except that the 50 mm width wound body of each surface protection film is cured for one week in a room at 40 ° C. ⁇ 2 ° C. and then the rewind speed is changed.
  • the high-speed rewinding force at a rewinding speed of 15 m / min was measured.
  • the high-speed unwinding force measured in this way was defined as the time-development force.
  • the time-development force is 3 N / 50 mm or less, it is evaluated that the feeding property is good, and a mark is given, and when it exceeds 3 N / 50 mm, the feeding property is evaluated as poor.
  • the time-development force is 3 N / 50 mm or less, it is evaluated that the feeding property is good, and a mark is given, and when it exceeds 3 N / 50 mm, the feeding property is evaluated as poor.
  • the time-development force is 3 N / 50 mm or less, it is evaluated that the feeding property is good, and
  • a nylon fiber having a diameter of 0.2 mm is cut into a length of 8 to 10 ⁇ m by a cryomicrotome, a cut piece is fixed on the slide glass, and the obtained surface protection film is attached to the slide glass with a 2 kg roller.
  • the piece was fixed between the slide glass and the surface protective film to prepare a convex sample having a diameter of 400 ⁇ m and a height of 10 ⁇ m.
  • the convex sample is set on the sample piece covering the lens part with the surface protective film so as to overlap the surface protective film covering the lens part, and a weight of 140 g is placed on the slide glass, It was allowed to stand for 24 hours in an oven.
  • Polypropylene (J715M manufactured by Prime Polymer Co., Ltd.) is used as the base material, and the base material and the pressure-sensitive adhesive composition are coextruded by the T-die method, so that the base material layer having a thickness of 34 ⁇ m and the pressure-sensitive adhesive layer having a thickness of 6 ⁇ m A surface protection film was formed by laminating and integrating, and a wound body wound around a paper core having an inner diameter of 3 inches was obtained.
  • the pressure-sensitive adhesive composition of the present invention is suitably used for a pressure-sensitive adhesive layer of a surface protective film such as a prism sheet or a diffusion film.
  • a surface protective film such as a prism sheet or a diffusion film.
  • the surface protective film of this invention is used suitably for surface protection, such as a prism sheet and a diffusion film.

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  • Chemical & Material Sciences (AREA)
  • Organic Chemistry (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • General Chemical & Material Sciences (AREA)
  • Health & Medical Sciences (AREA)
  • Medicinal Chemistry (AREA)
  • Polymers & Plastics (AREA)
  • Adhesives Or Adhesive Processes (AREA)
  • Adhesive Tapes (AREA)

Abstract

La présente invention concerne une composition d'adhésif caractérisé en ce qu'elle contient un polymère (i) qui est un copolymère ayant une structure représentée par la formule suivante: [A-B]n (où n = 1-3) ou un produit hydrogéné de ce dernier et un polymère (ii), qui est un copolymère ayant une structure représentée par la formule suivante: A-B-A ou par la formule suivante: (A-B)x-Y (où x = 1 et Y représente un reste d'un agent de couplage) ou un produit hydrogéné de ce dernier. La composition d'adhésif est également caractérisée en ce que la teneur totale en unités de composé alcényle aromatique dans les polymères (i) et (ii) représente 30 à 50 %, en poids et le rapport en poids entre la quantité totale de A et la quantité totale de B dans les polymères (i) et (ii) se situe dans la plage comprise entre 5:95 et 25:75. (Dans ce cas, A représente un bloc de polymère principalement composé d'unités de composé alcényle aromatique et B représente un bloc de polymère qui est un bloc de copolymère aléatoire diène conjugué à un alcényle aromatique ayant une teneur en unités de composé alcényle aromatique comprise entre 10 et 35 % en poids.)
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CN102149779B (zh) 2013-08-14
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JP5127903B2 (ja) 2013-01-23
JP2011057992A (ja) 2011-03-24
TW201016812A (en) 2010-05-01
KR101176811B1 (ko) 2012-08-24
JPWO2010029773A1 (ja) 2012-02-02
KR20110058856A (ko) 2011-06-01
CN102149779A (zh) 2011-08-10

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