WO2010029773A1 - Surface protective film - Google Patents

Surface protective film 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
surface
polymer
protective film
prism
pressure
Prior art date
Application number
PCT/JP2009/004549
Other languages
French (fr)
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
Original Assignee
積水化学工業株式会社
Jsr株式会社
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Publication date
Priority to JP2008232947 priority Critical
Priority to JP2008-232947 priority
Priority to JP2008-261605 priority
Priority to JP2008261605 priority
Priority to JP2008-301519 priority
Priority to JP2008301519 priority
Priority to JP2009-050842 priority
Priority to JP2009050842 priority
Priority to JP2009128249 priority
Priority to JP2009-128249 priority
Application filed by 積水化学工業株式会社, Jsr株式会社 filed Critical 積水化学工業株式会社
Publication of WO2010029773A1 publication Critical patent/WO2010029773A1/en

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    • CCHEMISTRY; METALLURGY
    • C08ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08FMACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONLY INVOLVING CARBON-TO-CARBON UNSATURATED BONDS
    • C08F8/00Chemical modification by after-treatment
    • C08F8/04Reduction, e.g. hydrogenation
    • CCHEMISTRY; METALLURGY
    • C09DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09JADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
    • C09J153/00Adhesives 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
    • C09J153/02Vinyl aromatic monomers and conjugated dienes
    • CCHEMISTRY; METALLURGY
    • C09DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09JADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
    • C09J153/00Adhesives 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
    • C09J153/02Vinyl aromatic monomers and conjugated dienes
    • C09J153/025Vinyl aromatic monomers and conjugated dienes modified
    • CCHEMISTRY; METALLURGY
    • C09DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09JADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
    • C09J7/00Adhesives in the form of films or foils
    • C09J7/20Adhesives in the form of films or foils characterised by their carriers
    • C09J7/22Plastics; Metallised plastics
    • CCHEMISTRY; METALLURGY
    • C09DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09JADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
    • C09J7/00Adhesives in the form of films or foils
    • C09J7/30Adhesives in the form of films or foils characterised by the adhesive composition
    • C09J7/38Pressure-sensitive adhesives [PSA]
    • CCHEMISTRY; METALLURGY
    • C08ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08LCOMPOSITIONS OF MACROMOLECULAR COMPOUNDS
    • C08L2666/00Composition 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
    • C08L2666/02Organic macromolecular compounds, natural resins, waxes or and bituminous materials
    • CCHEMISTRY; METALLURGY
    • C09DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09JADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
    • C09J2423/00Presence of polyolefin
    • C09J2423/006Presence of polyolefin in the substrate
    • CCHEMISTRY; METALLURGY
    • C09DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09JADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
    • C09J2453/00Presence of block copolymer
    • GPHYSICS
    • G02OPTICS
    • G02FDEVICES OR ARRANGEMENTS, THE OPTICAL OPERATION OF WHICH IS MODIFIED BY CHANGING THE OPTICAL PROPERTIES OF THE MEDIUM OF THE DEVICES OR ARRANGEMENTS FOR THE CONTROL OF THE INTENSITY, COLOUR, PHASE, POLARISATION OR DIRECTION OF LIGHT, e.g. SWITCHING, GATING, MODULATING OR DEMODULATING; TECHNIQUES OR PROCEDURES FOR THE OPERATION THEREOF; FREQUENCY-CHANGING; NON-LINEAR OPTICS; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
    • G02F1/00Devices 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
    • G02F1/01Devices 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 
    • G02F1/13Devices 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
    • G02F1/133Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
    • G02F1/1333Constructional arrangements; Manufacturing methods
    • G02F1/1335Structural association of cells with optical devices, e.g. polarisers or reflectors
    • G02F1/1336Illuminating devices
    • G02F1/133602Direct backlight
    • G02F1/133606Direct backlight including a specially adapted diffusing, scattering or light controlling members
    • G02F2001/133607Direct 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
    • GPHYSICS
    • G02OPTICS
    • G02FDEVICES OR ARRANGEMENTS, THE OPTICAL OPERATION OF WHICH IS MODIFIED BY CHANGING THE OPTICAL PROPERTIES OF THE MEDIUM OF THE DEVICES OR ARRANGEMENTS FOR THE CONTROL OF THE INTENSITY, COLOUR, PHASE, POLARISATION OR DIRECTION OF LIGHT, e.g. SWITCHING, GATING, MODULATING OR DEMODULATING; TECHNIQUES OR PROCEDURES FOR THE OPERATION THEREOF; FREQUENCY-CHANGING; NON-LINEAR OPTICS; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
    • G02F2202/00Materials and properties
    • G02F2202/28Adhesive materials or arrangements

Abstract

An adhesive composition characterized by containing a polymer (i), which is a copolymer having a structure represented by the following general formula: [A-B]n (wherein n = 1-3) or a hydrogenated product thereof, and a polymer (ii), which is a copolymer having a structure represented by the following general formula: A-B-A or the following general formula: (A-B)x-Y (wherein x ≥ 1 and Y represents a residue of a coupling agent) or a hydrogenated product thereof.  The adhesive composition is also characterized in that the total aromatic alkenyl compound unit content in the polymers (i) and (ii) is 30-50 wt%, and the weight ratio between the total amount of A and the total amount of B contained in the polymers (i) and (ii) is within the range of from 5:95 to 25:75. (In this connection, A represents a polymer block mainly composed of aromatic alkenyl compound units, and B represents a polymer block which is an aromatic alkenyl-conjugated diene random copolymer block having an aromatic alkenyl compound unit content of 10-35 wt%.)

Description

Surface protection film

The present invention relates to a surface protective film.

Conventionally, an optical device, metal plates, painted metal plate, a resin plate, a glass plate or the like, in order to protect the surface of various members, the surface pressure-sensitive adhesive layer on one surface of the film-like substrate formed by stacking protective film (generally, protect the tape, there is a case where the masking tape or called such surface protective sheet.) has been widely used. In particular, in recent years, surface protective film in an optical member for liquid crystal display is used. The optical member, such as a prism sheet or a diffusion film, are those that have become uneven surface. To this unevenness does not damage prior to use, its surface (especially, the outer surface of the irregularities) is protected by the surface protection film is being performed, bond the surface protective film on the surface of such irregularities attaching case, it is not possible to obtain a large contact area, it is necessary to form a strong adhesive strength adhesive layer.

Incidentally, in general, a surface protective film is industrially produced as a wound body formed by winding a long film in a roll form. In such a wound body and the surface protective film, rewinding required force of the wound body (expansion force) is high and is known to increase the deployment force is likely to increase over time, expand it force is small, i.e. rewinding the wound body has been demanded strongly that can be easily.
The surface protecting film is to be peeled off after use, the absence of the adherend contamination with smooth peelability and adhesive residue and the like are required.

On the other hand, the prism sheet or material such as a diffusion film, a polar polymer such as a resin of a resin and polycarbonate-based acrylic is frequently used. These optical sheets is being shipped to an optical device manufacturers after sticking the surface protective film, their delivery, may be exposed to elevated temperature in storage secondary.
Here, particularly when the surface of the adherend is an uneven shape, increase in adhesion due to the contact area between the adherend adhesive layer and increases by external factors such as time and temperature, so-called there is a problem of the pressure-sensitive adhesive Koshin.

In general, as the pressure-sensitive adhesive is widely used acrylic adhesive, acrylic adhesive, it is particularly large increase in the adhesive strength over time.

For this reason, especially for the surface protective film to be applied to the optical sheet, the pressure-sensitive adhesive layer constituting the surface protective film, rubber adhesive instead of the acrylic adhesive has been mainly used. Thus, to avoid an increase in adhesive force with time, the lens portion of the optical sheet of the surface protection film (prism) that like to smoothly peeled from the surface is achieved.

However, the side rubber adhesives are the general solution coating type, with and the like environmental pollution and energy waste during the solvent drying problems, back of the olefinic substrate layer is generic (pressure-sensitive adhesive layer is laminated releasing treatment to the surface) on the opposite side also required the. Also, if the hot-melt pressure-sensitive adhesive, the former problem can be eliminated or reduced, release treatment of the back can not be avoided.

For challenge of improving the unwinding property, for example, lamination of a polyorganosiloxane composed of a polyolefin resin substrate layer having one or more intramolecular double bond, and the adhesive layer are laminated on the surface of the base layer of the film, the manufacturing method of the surface protective film is irradiated with an electron beam or γ rays has been proposed (Patent Document 1).
Further, a surface layer containing a polyolefin resin and an adhesive layer containing a thermoplastic elastomer, after stacking deposited by co-extrusion method, thereby obtaining a release layer on the back surface of the surface layer formed by a coating method surface protective film has been proposed (Patent Document 2).
In place of the natural rubber, using a pressure-sensitive adhesive layer to styrene elastomer main component, a surface protective film formed by co-extrusion of an olefin substrate layer, the back surface of the base layer is being rubbing the surface protective film excellent in unwinding property is proposed (Patent Document 3).

On the other hand, the adhesive Koshin against challenge suppressing, for example, the initial adhesive strength to an adherend polyethyleneimine higher alkyl group is introduced narrowing mixed into the base material layer, by causing bleed out to the surface of the adhesive layer while ensuring, it has been made an attempt to suppress adhesive Koshin (Patent Document 4).

Incidentally, a prism sheet surface protective film is stuck is is given until incorporated into the product are stored stacked in several tens units are common.
In this case, the load of the prism sheet is disposed above the top portion of the concavo-convex of the prism sheet which is arranged below is destroyed, there is a case where the optical quality deteriorates. This is because the load, the bite the apex to the adhesive layer of the surface protective film, and reaches the substrate of the surface protective film, resulting in longer exceed the limit of dispersion and effect of relieving the load applied by the pressure-sensitive adhesive layer It believed to be due to. To resolve this problem, it is also considered may be sufficiently thick thickness of the adhesive layer. However, not only is disadvantageous in terms of manufacturing costs a thickness thicker the adhesive layer, a lens portion (prism) of biting depth into the pressure-sensitive adhesive layer is increased, a possibility that increase in adhesion with time is large was there.
From this reason, in place of the natural rubber, there are examples of the surface protective film styrene elastomer is used. For example, Patent Document 5, a surface protective film styrene elastomer of thickness greater than 10μm mainly pressure-sensitive adhesive layer is used is disclosed. This has been described to be able to meet the sufficient protection and proper adhesive property to adherends simultaneously.

JP-2-252783 discloses JP 2003-41216 JP JP-07-62311 discloses JP 09-188857 discloses JP 2000-80336 JP

However, the prior art still has the following problems.
Patent Document 1, or by the surface protective film 3, only the back treatment can not be sufficiently reduced deployment force not sufficient unwinding of the wound body, the workability may be deteriorated.
The release treatment method of Patent Document 2, can ensure a sufficient feed of even the back of the substrate is rough, the release agent is transferred to the adhesive layer, it may decrease the adhesion to adherends .
Surface protection film disclosed in Patent Document 4, extreme high temperature environments (e.g., tropical and subtropical areas) For storage in, when the amount of polyethyleneimine to bleed out on the surface of the storage in normal environment and different, it may not be effective enough adhesive Koshin suppressed.
The surface protective film disclosed in Patent Document 5, harsh conditions, such as, in particular, is attached to the prism surface of the prism sheet, opposite the surface with the prism surface side (i.e., the outer surface protective film on the surface), from the viewpoint also protect the top shape of the unevenness of the prism portion in the case, such as projections was pressed, such as the so-called fish eyes, there is room for further improvement.

Accordingly, an object of the present invention is to solve the problems described above, while ensuring an appropriate initial adhesive strength, excellent in developability, a surface protective film adhesive residue after peeling against the adherend is prevented it is to provide.
Moreover, a further object of the present invention, while ensuring an appropriate initial adhesive strength, extremely high (eg, 70 ° C.) also provides a surface protective film for a prism sheet having adhesive Koshin is suppressed in the environment of it is.
Moreover, a further object of the present invention, harsh conditions, such as, in particular, is attached to the prism surface of the prism sheet, the opposite side of the surface with the prism surface side (i.e., the outer surface of the surface protective film) and to provide a surface protective film which can also protect the top shape of the unevenness of the prism portion in the case, such as projections was pressed, such as the so-called fish-eyes.

The present inventors have intensive studies results, aromatic alkenyl polymer block with an aromatic alkenyl - by using a specific multi-block copolymer having a conjugated diene copolymer block in the adhesive layer, appropriate initial while ensuring the adhesive force, excellent developability, it found that the surface protective film adhesive residue after peeling is prevented to an adherend is obtained as a result of further study, and have completed the present invention.

The adhesive composition of the present invention,
Polymer (i): it comprises the following polymer block A and the following polymer block B, in the general formula [A-B] n (wherein, A is a polymer block A, B is a polymer block B, n is a copolymer (I) or its hydrogenated product having a structure represented by the representative.) an integer of 1-3,
Polymer (ii): wherein the following polymer block A and the following polymer block B, (. The symbols in the formula represent the same meanings as defined above) the formula A-B-A or formula (A-B) x -Y (wherein, x is integer of 2 or more, Y is a coupling agent residue, and other symbols represent. as defined above) copolymer having a structure represented by formula (II) or It contains a hydrogenated product thereof,
The polymer (i) and the polymer entire alkenyl aromatic unit content of (ii) (St (A + B)) is 30 to 50% by weight,
The polymer (i) and the polymer weight ratio of the total amount of the polymer block A included in each of (ii) and the total amount of the polymer block B (A: B) is 5:95 to 25: 75 in the range of a feature that is.
Polymer block A:
Alkenyl aromatic units are continuous, polymer block polymer block B composed mainly of an aromatic alkenyl compound units:
Alkenyl aromatic conjugated diene unit and an aromatic alkenyl compound units is included in the random - a conjugated diene copolymer block, heavy aromatic alkenyl compound unit content (St (b)) is 10 to 35 wt% polymer block

The surface protective film of the present invention includes a base material layer, and a pressure-sensitive adhesive layer including the pressure-sensitive adhesive composition of the present invention.
By using the adhesive composition of the present invention, the surface protective film of the present invention is excellent in developability, adhesive residue after peeling against the adherend can be prevented.

Preferably, in the surface protective film,
The base layer is a polyolefin substrate layer,
The pressure-sensitive adhesive composition further contains a tackifier, and the maximum and becomes the temperature is -10 ° C. ~ 20 ° C. of tanδ obtained by measuring the dynamic viscoelasticity at -50 ° C. ~ 80 ° C. of the pressure-sensitive adhesive layer it is.
Thus, the surface protective film may have a further preferred development of the initial adhesive strength of balance.

Preferably, in the surface protective film,
The base layer is a polyolefin substrate layer,
The pressure-sensitive adhesive composition of the tackifier, and further contains a styrenic block phase reinforcing agent,
The polymer (i), the polymer (ii) and the aromatic alkenyl compound unit weight in the styrenic block phase reinforcing agent, the proportion (alkenyl aromatic compound unit content) to the weight of the pressure-sensitive adhesive layer, 20 ~ 50% by weight.
This further suitably suppressed Koshin with time of adhesive strength.

Preferably, in the surface protective film, the storage modulus G at 70 ° C. of the pressure-sensitive adhesive layer 'is 4.5 × 10 5 Pa ~ 6.0 × 10 5 Pa.
This further suitably suppressed Koshin with time of adhesive strength.

Preferably, the surface protective film, if it is for protecting the surface of the prism surface of the prism sheet, is stuck on the prism surface, if a load of 0.3 N / cm 2 were loaded 24 hours in an atmosphere of 70 ° C. biting depth into the pressure-sensitive adhesive of the prism apex angle of the prism surface is less than 1% to 40% of the adhesive layer thickness.
Thus, while ensuring adequate adhesive strength, it can be suitably suppress damage to the prism.

Preferably, the surface protective film, if it is for protecting the prism surface of the prism sheet, is attached to the prism surface, the diameter 400μm on the surface opposite to the said prism surface, the protrusion height 12μm less than 1% or more and 100% or the biting depth into the adhesive layer of the prism apex angle of the prism surface of the pressure-sensitive adhesive layer thickness in the case of pressed.
Thus, while ensuring adequate adhesive strength, it can be suitably suppress damage to the prism.

Preferably, the surface protective film, if it is for protecting the prism surface of the prism sheet, the outer surface of the base layer is 0.7 to surface roughness Ra, waviness motif average height of more than 3μm of 2.0μm , and has the following waviness motifs average length 600μm or 350 .mu.m.
Thus, while ensuring adequate adhesive strength, harsh conditions, such as, in particular, is attached to the prism surface of the prism sheet, opposite the surface with the prism surface side (i.e., the outer surface of the surface protective film) in the case as pressed against the projections such as the so-called fish eyes, it can also protect the top shape of the unevenness of the prism portion in.

Preferably, the surface protective film is for protecting the surface of the diffusion film.

The surface protective film of the present invention is excellent in development property, it is prevented adhesive residue after peeling against the adherend.
Further, the surface protective film of an embodiment of the present invention, while ensuring an appropriate initial adhesive strength, extremely high (eg, 70 ° C.) even adhesive Koshin under an environment is suppressed.
Further, the surface protective film of an embodiment of the present invention, harsh conditions, such as, in particular, is attached to the prism surface of the prism sheet, the surface opposite to the said prism surface side (i.e., the outer surface of the surface protective film a), if, as pressed against the projections such as the so-called fish eyes, can also protect the top shape of the unevenness of the prism portion in.

It is a schematic view showing the undulation of the outer surface of the base layer. Is a perspective view of a prism sheet surface protective film of an embodiment of the present invention is applied. Structure surface protective film of an embodiment of the present invention is attached to the prism sheet

<Definitions of the symbols in the present specification>
The symbol "~" used to represent the numerical ranges herein, unless otherwise stated, the numerical range is employed is intended to include numerical values ​​of both ends.
As used herein, the term "content" of the repeating unit of the polymer used in the "alkenyl aromatic unit content" and the like, the weight ratio in terms of the monomers from which the repeating units, i.e., the polymer weight of the total monomers to form, the weight ratio of the monomer repeating units are derived from (wt%), i.e., it means an alkenyl aromatic compound content of the polymer [alkenyl aromatic compound content]. Here, "the weight of the total monomers for forming the polymer", approximates the weight of the polymer. Similarly, in the present specification, the repeating units of the polymer block A "content", the weight ratio in terms of the monomers from which the repeating units, i.e., of the total monomers for forming the polymer block relative to the weight means the ratio of the weight of the monomers the repeating units are derived from (by weight%). Here, "the weight of the total monomers for forming the polymer block", approximates the weight of the polymer block.
In the present specification, "the content of vinyl bonds", then the infrared absorption spectrum method, means the total content of the calculated 1,2-vinyl bond and 3,4-vinyl bond by Morello method.

<Pressure-sensitive adhesive composition>
The pressure-sensitive adhesive composition of the present invention contain the following polymer (i) and below the polymer (ii).
Herein, a "polymer (i)" includes the following polymer block A and the following polymer block B, in the general formula [A-B] n (wherein, A is a polymer block A, B is the polymer block B, n is a copolymer (I) or its hydrogenated product having a structure represented by the representative.) an integer of 1-3.
Herein, a "polymer (ii)" includes the following polymer block A and the following polymer block B, the general formula A-B-A (symbols in the formula represents the same meaning as defined above.) Or formula (a-B) x-Y (wherein, x is integer of 2 or more, Y is a coupling agent residue, and other symbols represent the same meanings as defined above.)
In a copolymer (II) or its hydrogenated product having a structure represented by.
In the present specification, the consisting polymer (i) and the polymer (ii) and composition, simply referred to as "copolymer composition".
In the adhesive composition of the present invention, the polymer (i) and the polymer entire alkenyl aromatic unit content of (ii) is 30 to 50% by weight,
The polymer (i) the weight ratio of the total amount of the total amount and the polymer block B of the polymer block A included in the polymer (ii) is 5:95 to 25: 75. range.
As used herein, "polymer block A" continuously aromatic alkenyl compound units, a polymer block composed mainly of an aromatic alkenyl compound units.
As used herein, "polymer block B", an aromatic alkenyl conjugated diene unit and an aromatic alkenyl compound units is included in the random - a conjugated diene copolymer block, an aromatic alkenyl compound unit content (St (b)) is a polymer block is 10 to 35 wt%.

<Polymer block A>
As described above, "the polymer block A" continuously aromatic alkenyl compound units, a polymer block composed mainly of an aromatic alkenyl compound units.

The term "alkenyl aromatic compound unit" is a repeating unit derived from an aromatic alkenyl compound. As the "alkenyl aromatic", for example, styrene, tert- butyl styrene, alpha-methyl styrene, p- methyl styrene, p- ethylstyrene, divinylbenzene, 1,1-diphenylethylene, vinylnaphthalene, vinyl anthracene, N , it may be mentioned N- Jechiru -p- aminoethyl styrene and vinyl pyridine. Above all, the raw material is Because of their ease industrially available, "alkenyl aromatic compound unit" is preferably a styrene unit.

"Polymer block A" needs to be configured with an aromatic alkenyl compound units as main repeating unit. Specifically, the alkenyl aromatic compound unit content is 80 wt% or more. By increasing the aromatic alkenyl compound unit content of 80 wt% or more, it is possible to improve the thermoplastic adhesive composition is advantageous in that the recycling of the pressure-sensitive adhesive composition is made easier. As the repeating unit other than the aromatic alkenyl compound units it is contained in a range of less than 20 wt%, repeating units derived from an alkenyl aromatic compound and a copolymerizable compound, e.g., a conjugated diene compound and (meth) and a repeating unit derived from acrylic acid ester compound. Among them, 1,3-butadiene, isoprene are preferred because they have high copolymerizability with alkenyl aromatic compounds.

<Polymer block B>
As described above, "polymer block B", an aromatic alkenyl conjugated diene unit and an aromatic alkenyl compound units is included in the random - a conjugated diene copolymer block, an aromatic alkenyl compound unit content (St (b)) is a polymer block is 10 to 35 wt%.

A "unit conjugated diene compound" constituting the "polymer block B", a repeating unit derived from a conjugated diene compound. The "conjugated diene compound", for example, 1,3-butadiene, isoprene, 2,3-dimethyl-1,3-butadiene, 1,3-pentadiene, 2-methyl-1,3-octadiene, 1,3 hexadiene, 1,3-cyclohexadiene, 4,5-diethyl-1,3-octadiene, 3-butyl-1,3-octadiene, can be exemplified myrcene and chloroprene. Among them, polymerization reactivity is high, raw materials for the reason that industrially easily available, "conjugated diene compound unit" is a least one recurring unit of selected from the group of 1,3-butadiene units and isoprene units it is preferable.

"Polymer block B" may need to be configured a conjugated diene compound unit as a main repeating unit. From the viewpoint of exhibiting the effects of the present invention, it is preferable that the conjugated diene compound unit content is in the range of 65-90 wt%.

Also, "polymer block B", from the viewpoint of obtaining the effects of the present invention, an aromatic alkenyl compound unit content (St (b)) is must be within the range of 10 to 35 wt%, 13-33 preferably in the range of weight percent, and more preferably in a range of 16-30 wt%. The alkenyl aromatic compound unit content of less than 10% by weight, the developability is heavy, the handling property is deteriorated. On the other hand, when it exceeds 35 wt%, poor flexibility of the adhesive composition, the surface protective film important, it may not be possible to secure sufficient adhesive strength.
Incidentally, "the polymer block B", to the extent not impairing the effects of the present invention may also include repeating units other than the conjugated diene compound units, and aromatic alkenyl compound units.

Also, "polymer block B", from the viewpoint of exhibiting the effects of the present invention, it is preferable that the vinyl bond content is in the range of 50 to 90%, more it is in the range of 60-80% preferable. Further, by the vinyl bond content of 50% or more, there is an advantage that it is possible to constitute a pressure-sensitive adhesive composition having an excellent balance of tack and adhesion.

<Copolymer (I)>
"Copolymer (I)" includes the following polymer block A and the following polymer block B, in the general formula [A-B] n (wherein, A is a polymer block A, B is the polymer block B the, n represents a copolymer having a structure represented by the representative.) an integer of 1-3.

Since "n" represents an integer of 1 to 3, is apparent, as the "structure represented by the formula [A-B] n", for example, A-B, A-B-A-B, and structure represented by a-B-a-B-a-B and the like. In these block copolymers, A and B, respectively may be the same in the repetition, may be different.

In the structure represented by [A-B] n, from the viewpoint of reliably exhibit the effects of the polymer block B, the polymer block B of the terminal is preferably accounted for more than 2% by weight of the total copolymer. Even if ends of the part of the copolymer (I) optionally has a structure -A, when the content of the terminal of the polymer block A is less than 2% by weight of the total copolymer (I) the terminally can exhibit the same effect as that of polymer block B. That is, the structure can be regarded as substantially ends is a polymer block B.

n is required to be an integer of 1-3. By the n in this range, industrial productivity is improved. From the viewpoint of improving the adhesion and material strength, more preferably n is 1 or 2, particularly preferably 1. That is, "the general formula copolymer having the structure represented by [A-B] n" is a block copolymer having the structure represented by the general formula A-B are particularly preferred.

Copolymer (I) or a hydrogenated product (polymer (i)) is preferably an alkenyl aromatic compound unit content is in the range of 30 to 50 weight, that is 33 to 45 wt% more preferable. By an aromatic alkenyl compound unit content within this range, it is configured and moderate holding force, combines followability to unevenness of the adherend surface, and an excellent pressure-sensitive adhesive composition developability It can become.

No particular limitation is imposed on the molecular weight of the polymer (i), it is preferable that the weight average molecular weight of 30,000 to 500,000 and further preferably 80,000 to 300,000 is 100,000 to 200,000 It is particularly preferred. With the range a weight average molecular weight of 30,000 to 500,000, consisting of a polymer (i), and hence the polymer (i) and the copolymer (II) or its hydrogenated product (polymer (ii)) the industrial production of the copolymer composition can be made easy. If the weight average molecular weight is less than 30,000, the desolvation of the polymer, in the step of drying will adhere polymer in the production facilities, there is a case where the industrial production of the polymer (i) becomes difficult. On the other hand, if the weight average molecular weight is 500,000 or more, poor solubility and heat-meltable in a solvent, there is a case where the processing of the pressure-sensitive adhesive body becomes difficult.

Hydrogenated product of the copolymer (I), since the excellent heat resistance and weather resistance can be obtained, the double bond is 80% or more derived from a conjugated diene monomer, preferably 90% or more, more preferably 95% above, and is preferably a hydrogen additive unsaturated bonds are hydrogenated into saturated bonds by hydrogenation.
. In the present specification, the ratio of hydrogenation (hydrogenation rate) is used carbon tetrachloride as a solvent, 270 MHz, means a hydrogenation rate calculated from l H-NMR spectrum.
Polymer (i) may be a single (one), or a combination of two or more thereof.

<Copolymer (II)>
"Copolymer (II)" includes the following polymer block A and the following polymer block B, (the symbols in the formula represent the same meanings as defined above.) General formula A-B-A or the general formula (A -B) x-Y (wherein, x is integer of 2 or more, Y is a coupling agent residue, and other symbols represent the same meanings as defined above.)
In a copolymer having a structure represented by.

As apparent from the formula, the copolymer (II) has the polymer block A in all its molecular ends.
It is preferred that the polymer block A terminal accounts for 2% by weight or more of the total copolymer (II). This is because to reliably exhibit the effects of the polymer block A. Even if ends of the part of the copolymer (II) has it has a structure -B, if polymer block content of B in the end is less than 2% by weight of the total copolymer (II) the terminally can exhibit the same effect as a polymer block a. That is, the structure can be regarded as substantially ends is a polymer block A.
Formula (A-B) x-Y (wherein, x is integer of 2 or more, Y is a coupling agent residue, and other symbols represent. As defined above) a structure represented by copolymer having, in turn, has a structure in which copolymer (I) has been coupled by Y. Thus, in the case of (A-B) x-Y, in the same reaction vessel, (I), since it is possible to synthesize a mixture of (II),
From industrial point of view, it is preferable for (A-B) x-Y. If x is 3 or more, the copolymer is a so-called star polymer. x is to inhibit side reactions in the copolymer during the production, from the viewpoint of controlling the physical properties of the copolymer, preferably 2-4.

Further, the copolymer (II) or its hydrogenated product (polymer (ii)) also for the same reason as the polymer (i), it alkenyl aromatic unit content is in the range of 30 to 50 weight preferably, and more preferably 33 to 45 wt%.

Polymer (ii), since the excellent heat resistance and weather resistance can be obtained, the double bond is 80% or more derived from a conjugated diene monomer, preferably 90% or more, more preferably 95% or more, by hydrogenation it is preferable unsaturated bond is a hydrogenated product which is hydrogenated to saturated bonds.

No particular limitation is imposed on the molecular weight of the polymer (ii), the weight average molecular weight of 50,000 to 500,000, and more preferably from 50,000 to 300,000. The weight average molecular weight in a range of from from 50,000 to 500,000, the polymer (ii), easy industrial production of thus polymer (i) and the copolymer composition comprising the polymer and (ii) it can be a thing. If the weight average molecular weight is less than 30,000, the desolvation of the polymer, would adhere polymer in the production facilities in the step of drying, the industrial production of the copolymer (II) or a hydrogenated product thereof becomes difficult If there is a. On the other hand, if the weight average molecular weight is 500,000 or more, poor solubility and heat-meltable in a solvent, there is a case where the processing of the pressure-sensitive adhesive body becomes difficult.
Polymer (ii) may be a single (one), or a combination of two or more thereof.

<Copolymer composition>
As described above, the pressure-sensitive adhesive composition of the present invention is a pressure-sensitive adhesive composition containing a copolymer composition comprising a polymer (i) a polymer and (ii) as a constituent. In this copolymer composition, the weight ratio of the polymer the polymer (i) (ii) is 90: 10 to 10: must be in the range of 90. In a total volume 100 parts by weight of the polymer (i) and polymer (ii), by including the polymer (i) 10 parts by weight or more, the adhesive layer is lifted from the surface of the adherend, the film is peeled off the favorable effect that it will inconvenience the (floating) may be effectively prevented can be exhibited. On the other hand, in 100 parts by weight of the total amount of the polymer the polymer (i) (ii), by including the polymer (ii) 10 parts by weight or more, when removing the film from the surface of the adherend, the it can exhibit a preferable effect that it is possible to effectively prevent and adhesive remaining problem contaminate the surface of the adherend (adhesive residue) on the surface of the adherend.
From the viewpoint of preventing lifting or adhesive residue of the adhesive layer more securely, the weight ratio of the polymer the polymer (i) (ii) is 50: 50 ~ 15: is preferably in the range of 85.

From the viewpoint of the effect of the present invention, the weight ratio of the total amount of the total amount and the polymer block B of the polymer (i) and the polymer block A included in the polymer (ii) is 5:95 to 25: 75 it is required to be within the range of. Also, in 100 parts by weight of the total amount of the polymer block A and polymer block B, by including the polymer block A 5 parts by weight or more, it can be imparted a moderate holding force to the pressure-sensitive adhesive layer formed it can exhibit a preferable effect becomes. On the other hand, in 100 parts by weight of the total amount of the polymer block A and polymer block B, by including the polymer block B 75 parts by weight or more, the pressure-sensitive adhesive layer formed is satisfactory with respect to the unevenness of the adherend surface to indicate the Do conformability, it is possible to exert a favorable effect of making it possible to reliably protect the surface of the adherend. Polymer block A total volume of the weight ratio of the total amount of the polymer block B of 5:95 to 25: is preferably in the 75 range of 7: 93-23: more preferably 77 in the range of , 10:90 to 21: and especially preferably 79 in the range of.

<Surface protection film>
The surface protective film of the present invention includes a base material layer, and a pressure-sensitive adhesive layer including the pressure-sensitive adhesive composition of the present invention as described above.
Preferably, the adhesive layer is laminated on one surface of the substrate layer.

<Base layer>
Preferably as the substrate layer is a polyolefin substrate layer.
The As "polyolefin" includes, for example, low density polyethylene, medium density polyethylene, high density polyethylene, linear low density polyethylene, ethylene -α- olefin copolymer, ethylene - ethyl acrylate copolymer, ethylene - vinyl copolymerization acetate coalescence, ethylene - methyl acrylate copolymer, ethylene -n- butyl acrylate copolymer, and polypropylene (homopolymer, random copolymer, block copolymer) and the like.
These may be used alone or in combination of two or more. Further, "polyolefin" may be a polyolefin having a substituent, a resin other than polyolefin may be added. Further, generated in the manufacturing process of the surface protective film, the end member of the end member and the surface protective film of the polyolefin substrate layer may be added.
Base layer may be a single layer may be a layer having two or more multilayer structure having different compositions.
Substrate layer, by application of the surface protective film can be adjusted its thickness as appropriate. Usually, it is appropriate to set a thickness of about 10 ~ 100 [mu] m.

Preferably, the outer surface of the base layer (i.e., the surface opposite to the pressure-sensitive adhesive layer side), the surface roughness of 0.7 ~ 2.0μm Ra, 3μm or more waviness motifs average height, and 350μm above 600μm having the following waviness motifs average length.
Thus, the surface protective film of the present embodiment, even when stacked storage by attaching to the surface of the prism sheet, since damage to the lens portion of the prism sheet (prism) can be difficult to occur, the prism surface of the prism sheet it can be suitably used for protection.
In particular, the surface roughness of the back surface of the substrate layer, waviness motif average height, and waviness by motif average length is in the predetermined range, the prism sheet surface protective film is affixed a plurality of stacked storage because if the foreign object enters it can bite minute at the valley of the undulation of the surface even if small bite narrowing foreign matter, the stress surface is concentrated in the lens portion of the prism sheet in comparison with the case smooth it is considered that can be lowered.
In this specification, "surface roughness Ra", JIS B0601: as specified in 2001, is a "arithmetic mean height". Waviness motif average height W is in schematic diagram showing an undulation of a polyolefin substrate layer surface of FIG. 2, as an average value of Wj, also waviness motif average length AW is the average value of the AWJ, calculated by the following formula It is.

Figure JPOXMLDOC01-appb-M000001
As used herein, "waviness motif average length" and "waviness motif average height", respectively JIS B0601: "the average length of the profile elements" as defined in 2001 and the average height of the "profile elements "it is.

<A pressure-sensitive adhesive layer>
The pressure-sensitive adhesive layer comprises a pressure-sensitive adhesive composition of the present invention. The pressure-sensitive adhesive composition may contain, in addition to the polymer (i) and the polymer (ii), optionally, tackifiers, styrenic block phase reinforcing agent, softener, antioxidant, light stabilizer , ultraviolet absorbers, fillers, pigments, adhesive Koshin agents, olefin resins, silicone-based polymers, liquid acrylic copolymers, known additives such as phosphoric acid ester compound may contain appropriate.

The tackifying agent used in the present invention, for example, aliphatic copolymer, an aromatic copolymer, an aliphatic, aromatic copolymer and alicyclic copolymer petroleum resins, coumarone - indene resins, terpene resins, terpene - phenolic resins, rosin resins polymerized rosin, (alkyl) phenol resin, xylene resin or the like these hydrogenated products, generally adhesive it can be used without particular limitation for use in. The softening point of the tackifier is more preferable to use those 90 ~ 140 ° C.. These tackifiers may be used alone or in combination of two or more. Incidentally, in order to increase the peeling resistance and weather resistance, it is more preferable to use a tackifier hydrogenation system. It may also be used a tackifier commercially available as a blend with an olefin resin.
The tackifier of the present invention, compatible with respect to the rubber layer is a conjugated diene or soft segments hydrogenated aromatic alkenyl block copolymer, is capable of controlling the adhesive strength .
Note that "compatible", tan [delta peak temperature of the blend obtained by blending a tackifier to the copolymer composition, the condition to be a value different from the tan [delta peak temperature of the copolymer composition say that. In the present specification, the term "tan [delta peak temperature" means the temperature at which the maximum of tan [delta.

Styrenic block phase reinforcing agent is used in order to suppress the adhesive Koshin of the adhesive layer.
Examples of the styrene block phase reinforcing agent used in the present invention, for example, as a monomer unit, styrene and α- methyl styrene, p- methyl styrene, p- chlorostyrene, chloromethylstyrene, tert- butylstyrene, p- ethylstyrene , styrenic compounds such as divinylbenzene. These may be used alone or in combination of two or more. In other words, styrenic block phase reinforcing agent can be obtained by polymerizing these monomers. For copolymer of two or more monomers may be a block copolymer, a random copolymer. Among them, styrenic block phase reinforcing agent is preferably one having a softening point above about 100 ° C., more preferably at least 0.99 ° C.. Specifically, Eastman Chemical Co., trade name "ENDEX155" (softening point 155 ° C.), "ENDEX160" (softening point 160 ° C.) and the like are preferably used.

Softeners typically, is effective in improving the adhesive strength. Examples of the softening agent include a low molecular weight diene-based polymer, a polyisobutylene, a hydrogenated polyisoprene, hydrogenated polybutadiene, paraffinic process oil, naphthenic process oil, aromatic process oil, castor oil, tall oil, natural oil, liquid polyisobutylene resins, polybutene, or what is commonly used for pressure-sensitive adhesive such as these hydrogenated products, especially it can be used without limitation. These softening agents may be used alone or in combination of two or more.

The antioxidant is not particularly limited, for example, phenol (monophenol-based, bisphenol-based, polymer-type phenol), a sulfur-based, it includes those commonly used phosphorus-based or the like.
The light stabilizers include hindered amine compounds.
As the ultraviolet absorber is not particularly limited, for example, salicylic acid, benzophenone, benzotriazole, and cyanoacrylate or the like.

As the filler, for example, calcium carbonate, magnesium carbonate, silica, zinc oxide, and titanium oxide.
The pressure-sensitive Koshin agents, fatty amides, long chain alkyl graft of polyethyleneimine, soybean oil-modified alkyd resins (e.g., manufactured by Arakawa Chemical Industries, Ltd., trade name "Arakyd 251", etc.), tall oil-modified alkyd resins (e.g., Arakawa chemical Industries, Ltd., trade name "Arakyd 6300", etc.), and the like.
These additives may be used alone or in combination of two or more.

But not the thickness of the adhesive layer particularly limited, for example, usually 0.5 ~ 50 [mu] m approximately, preferably from 1 ~ 40 [mu] m, more preferably 2 ~ 30 [mu] m.

In one preferred embodiment of the surface protective film of the present invention,
The base layer is a polyolefin substrate layer,
The pressure-sensitive adhesive composition further contains a tackifier, and the maximum and becomes the temperature is -10 ° C. ~ 20 ° C. of tanδ obtained by measuring the dynamic viscoelasticity at -50 ° C. ~ 80 ° C. of the pressure-sensitive adhesive layer it is.

Examples of the tackifier, may be used such as those exemplified above.
Tackifier, it has suitable for use in an amount capable of preventing adhesive residue when peeling the surface protective film from the adherend. For example, when used as a surface protective film for the prism sheet, the mixing ratio of the tackifier, rubber resin component [the polymer (i), and the polymer (ii) (hereinafter, these are collectively may be referred to as alkenyl aromatic block copolymer.)] relative to 100 parts by weight 5-50 by weight, more preferably 10 to 40 parts by weight.

tanδ peak temperature obtained by measuring the dynamic viscoelasticity at -50 ° C. ~ 80 ° C. of the adhesive layer is preferably in the range of -10 ℃ ~ 20 ℃. The tanδ peak temperature is adjusted rubber resin component, for example, aromatic alkenyl compound units of content range in a random block of alkenyl aromatic block copolymer, the mixing ratio or the like of the tackifier in the adhesive layer, Alternatively, in consideration of the softening temperature or the like, by selecting the tackifier to be used can be adjusted to the preferred range.

Here, tan [delta, in the measurement temperature range of -50 ° C. ~ 80 ° C., means a loss tangent in a dynamic viscoelasticity spectrum measured (= loss modulus / storage modulus) under the following conditions.
Viscoelasticity spectrometer: the trade name of "DVA-200" (manufactured by IT Measurement and Control, Inc.)
Sample size of the pressure-sensitive adhesive layer: thickness of about 1.5 mm × 5 mm × 10 mm
Setting heating rate: 6 ° C. / min Measurement frequency: 10 Hz
Measurement mode: shear

Such tanδ peak temperature measured in the With this range, coupled with the action of the tackifier, it is possible to improve the cohesive force of the pressure-sensitive adhesive layer. Thus, when the back adhesive layer of the base layer of the surface protective film was been adhesive wound body also from the back of the base layer can be easily peeled off the surface protective film. In other words, it is possible to return without difficulty up the wound body. Further, even when applied to an adherend having an uneven surface, it is possible to follow the unevenness, it is possible to ensure the surface protection of the adherend.

In another preferred aspect of the surface protective film of the present invention,
The base layer is a polyolefin substrate layer,
The pressure-sensitive adhesive composition of the tackifier, and styrenic block phase reinforcing agent further contain, the polymer (i), and the polymer (ii) and an alkenyl aromatic compound unit in the styrenic block phase reinforcing agent ratio by weight of the weight of the adhesive layer (alkenyl aromatic compound unit content) is 20 to 50 wt%. The ratio may less than 20 wt% and aging of the adhesive strength is liable to Koshin, when the proportion exceeds 50% by weight, the high adhesive strength can not be obtained.

Examples of the tackifier, may be used such as those exemplified above.

Tackifier is preferably used in the amount used can prevent adhesive residue when peeling the surface protective film from the adherend. For example, tackifiers, rubber-based resin component (alkenyl aromatic block copolymer) with respect to 100 parts by weight, is preferably contained in about 5 to 50 parts by weight, more preferably 10 parts by weight to is about 40 parts by weight.

Further, Examples of the styrenic block phase reinforcing agent, can be used such as those exemplified above.
Styrenic block phase reinforcing agents, for example, with respect to the alkenyl aromatic block copolymer 100 parts by weight, it is preferable to be compounded with more than about 40 parts by weight, more preferably not more than about 30 parts by weight. Although only to be blended more than 0 parts by weight, more than one part by weight is preferred.

The use of styrenic block phase reinforcing agent, can be compatibilized styrene (St) phase in the styrene copolymer block, improving the cohesive force of the pressure-sensitive adhesive layer. This allows the surface protective film is adhered from the back of the polyolefin substrate layer can be easily peeled off, return reasonably winding wound body. Further, the surface protective film can be prevented adhesive residue when peeling from the adherend, it is possible to peel a relatively small force.

In the surface protective film of the present invention, the storage modulus G at 70 ° C. of the pressure-sensitive adhesive layer 'is preferably 4.5 × 10 5 Pa ~ 6.0 × 10 5 Pa.
Storage modulus G 'by is 4.5 × 10 5 Pa or more, even under high-temperature environment, is undesirable adhesive Koshin is suppressed, whereas the storage modulus G' in the 6.0 × 10 5 Pa or less by some suitable adhesive force can be obtained.
To adjust the storage modulus G of the pressure-sensitive adhesive 'adjusts the aromatic alkenyl compound unit content of the pressure-sensitive adhesive layer in the surface protective film of the present invention, the cohesion of the alkenyl aromatic block copolymer it may be within the appropriate range. Adjusting the content, the use of alkenyl aromatic block copolymer having a content ratio of suitable aromatic alkenyl monomer monomer-derived components, and / or a styrenic block phase reinforcing agent added to the adhesive layer it can be carried out by. Styrenic block phase reinforcing agents are agents for reinforcing the island phase of the sea-island structure in which an aromatic alkenyl Block Copolymers, having properties compatible with the domain of alkenyl aromatic block copolymer.
The amount of the styrenic block phase reinforcing agent with respect to alkenyl aromatic block copolymer 100 parts by weight, preferably 40 parts by weight or less, more preferably 30 parts by weight or less. When the amount is too large, the adhesion is insufficient, when the extruded there is a possibility that the fluidity becomes poor. The lower limit of the use amount is not particularly limited, when there is no need to adjust the aromatic alkenyl compound unit content as described above, the addition but need, and preferably 1 part by weight or more.

The surface protective film of the present invention, in another preferred aspect, a surface protecting the prism surface of the prism sheet, is stuck on the prism surface, of 0.3 N / cm 2 in an atmosphere of 70 ° C. biting depth into the pressure-sensitive adhesive of the prism apex angle of the prism surface is less than 1% to 40% of the pressure-sensitive adhesive layer thickness when loaded 24 hours load.
The biting depth, by the following methods, is measured.
The test Tamesuru surface protective film, at room temperature 23 ° C. and a relative humidity of 50%, the surface of the prism sheet, using a crimping rubber roller 2kg each paste at 300 mm / min. The prism sheet, the center distance 50μm prism, using what is height 25 [mu] m. Thereafter, scissors pasted prism sheet of the surface protection film of a polycarbonate plate (thickness 2 mm), a pressure of 0.3 N / cm 2, an environment of 70 ° C. In this state, stand for 24 hours. Then peeling the surface protective film at a peel angle of 180 degrees to observe the surface of the adhesive layer by a laser microscope to measure the prism lens unit of the sheet (prism) biting depth into the apex angle of the pressure-sensitive adhesive layer.
By the biting depth of less than 1% to 40% of the pressure-sensitive adhesive layer thickness, without adversely affecting the adhesive properties such as adhesive strength, high temperature (eg, 70 ° C.) adhesion when placed in an environment of Koshin is suppressed.
The decided to 1% or more less than 40% the depth of the pressure-sensitive adhesive layer thickness of biting, for example, achieved by a storage modulus G 'at 70 ° C. of the pressure-sensitive adhesive layer is controlled in a preferable range of the It is.

The surface protective film of the present invention, in another preferred aspect, a protective prism surface of the prism sheet,
Is affixed to the prism surface, the depth of bite into the pressure-sensitive adhesive layer of the prism apex angle of the prism surface when pressed against the opposite surface to the diameter 400μm of the projection height 12μm and the prism surface side is a less than 100% more than 1% of the pressure-sensitive adhesive layer thickness.
Here, the condition for pressing the protrusions is preferably 24 hours at a force of 0.8N / cm 2 in an atmosphere of 50 ° C..
Further, the projection is less in diameter 400 [mu] m, even when the height is 12μm or less, the upper limit of likewise the biting depth, it is expected to be less than 100% of the adhesive layer thickness.
Thus, attached to the surface protective film of the present invention the prism sheet, and affixed to another surface protective film on a smooth sheet surface, for example, when stored by stacking several tens prism sheets, if smooth sheet surface as foreign substances projections biting FE or is present on the surface protective film also for the aromatic alkenyl compound unit content of the adhesive layer of the adhesive surface protective film is set to an appropriate amount, the adhesive adhesive layer becomes hard, the lens portion of the prism sheet, bite excessive to the adhesive layer of the surface protective film can be suppressed reliably. Thereby hardly damaged lens portion surface of the prism sheet (prism surface) occurs.
To the biting depth less than 100% more than 1% of the pressure-sensitive adhesive layer thickness, it mainly aromatic alkenyl compound unit content of alkenyl aromatic block copolymer is 30 to 50 wt%, It has been achieved. For this content is low cohesive force of the adhesive is less than 30 wt%, it may not be able to suppress biting depth into the pressure-sensitive adhesive layer of the prism lens. Conversely, if this content exceeds 50 wt%, the cohesive force of the pressure-sensitive adhesive is too high, the prism lens is not easily bite into the pressure-sensitive adhesive layer, the adhesive force is too low, it is used as a protective film there is a case that can not be.

Lens portion of the prism sheet surface protective film of the present invention is applied has a prism shape consisting of substantially triangular prism. Herein refers to a surface having a lens unit having such a prism shape and the prism surface. More specifically, as shown in FIG. 2, the prism sheet 1 has a plurality book triangular prismatic lens portion 3 of the one surface of the flat sheet 2 are integrated structure. Lens unit 3 has a substantially triangular prism shape. Then, as the ridge line of the triangular are parallel, a plurality of lens portions 3 are closely juxtaposed. The outer surface of the lens portion 3 of the prism shape is protected by a surface protective film of the present invention.
For example, as shown in cross section in FIG. 3, the portion in which the lens unit 3 of the prism sheet 1 is provided, the first surface protecting film 4 (the surface protecting film of the present invention) is stuck. First protective surface film 4 includes a base layer 5, and an adhesive layer 6 provided on one surface of the base layer 5, the adhesive layer 6 side, the plurality of lenses of the prism sheet 1 part 3 is stuck on the side is provided. Therefore, the surface protective film of the present invention, is attached in contact with the plurality of top 3a of the triangular-shaped lens portion 3. Although the cross-sectional shape of the triangular prism of the lens portion 3 is triangular, the triangular is preferably set to bottom side that is fixed to the seat isosceles triangle.
Meanwhile, the side on which the prism sheet 1, the lens portion 3 is provided on the flat surface of the opposite side, if desired, the second surface protecting film 7 is stuck. If projections of foreign objects such as fish eyes (FE) or biting into the surface protective film 7 is present, it can cause destruction of the top of the lens portion.

Incidentally, the side surface of the prism shape of the triangular prism shall be construed as three sides extending in the length direction of the triangular prism.

In the preferred prism sheet surface protective film of the present invention is applied, a plurality of prisms substantially triangular prism, the distance between adjacent prism, i.e., it is preferable that the pitch of the prism is about 10 ~ 1000 .mu.m, more preferably 10 ~ 500 [mu] m, but adherend surface protective film of the present invention is applied is not limited thereto.

<Manufacturing Method>
The adhesive composition of the present invention, for example, the copolymer (I) and the copolymer (II) respectively synthesized by block polymerization, these after blended at a predetermined weight ratio, performs optionally hydrogenated , is prepared by mixing a copolymer (I) or a hydrogenated product thereof, and copolymers (I) or give a mixture of a hydrogenated product thereof, and conventional methods of additives to be blended as desired .
The hydrogenation catalyst can be used periodic table Ib, IVb, Vb, VIb, VIIb, a compound containing one Group VIII metal. For example, Ti, V, Co, Ni, Zr, Ru, Rh, Pd, Hf, Re, can be cited a compound containing Pt atom, more particularly, Ti, Zr, Hf, Co, Ni, Rh , metallocene compounds such as Ru, pd, Ni, Pt, Rh, carbon and metals such as Ru, silica, alumina, diatomaceous earth, and the like supported heterogeneous catalyst supported on a carrier such as basic activated carbon it can.
As specific examples of the metallocene compounds, cyclopentadienyl rings (Cp ring) or Kaminsky which two have a substituted ligands hydrogen on Cp ring with an alkyl group (Kaminsky) catalyst, ansa (answer) type metallocene catalyst include unbridged half metallocene catalyst, a crosslinking half metallocene catalysts.
Specific examples and, JP-A-1-275605, JP-A No. 5-271326, JP-A No. 5-271325, JP-A No. 5-222115, JP-A No. 11-292924, JP 2000-37632, JP-Sho 59-133203, JP-Sho 63-5401, JP-Sho 62-218403, JP-A No. 7-90017, JP-Sho 43-19960, JP it can be exemplified catalysts described in Publication 47-40473 JP. These various catalysts may be used alone individually or as a combination of two or more thereof.

Alternatively, if the copolymer (II) is the (the symbols in the formula representing. The same meanings as defined above) In formula (A-B) x-Y has the structure represented by, the adhesive of the present invention composition, the method (coupling method) as follows, may be produced. Coupling method may be synthesized copolymer (I) or a hydrogenated product (polymer (i)) and the copolymer (II) or its hydrogenated product (polymer (ii)) in one pot it because the manufacturing process is simple, inexpensive production costs, the type and amount of the coupling agent, preferably in the viewpoint of capable of controlling the ratio of the polymer the polymer (i) (ii).

Coupling method,
First step: a step of synthesizing a block polymer a copolymer having a structure of [A-B],
Second step: the part of the copolymer having the structure of [A-B], a coupling agent Y-Z x (where "Y" coupling agent residue, "Z" is a leaving group, a step by coupling, to synthesize a copolymer having a structure of {[a-B] x -Y } by the "X" represents an integer of 2 or more.)
In order to obtain the hydrogenated product is further
Step 3: the by hydrogenating a copolymer having a structure of [A-B] Structure copolymer and the having the {[A-B] x -Y }, co were respectively hydrogenated heavy and a step of obtaining a polymer (I) consisting of a copolymer (II) and the copolymer composition.

The "coupling agent", for example, methyldichlorosilane, dimethyldichlorosilane, methyltrichlorosilane, butyl trichlorosilane, tetrachlorosilane, dibromoethane, tetrachloro tin, butyl trichloro tin, tetrachloro germanium, bis (trichlorosilyl) ethane halogen compounds and the like; epoxy compounds such as epoxidized soybean oil; diethyl adipate, dimethyl adipate, dimethyl terephthalate, carbonyl compounds such as diethyl terephthalate, polyvinyl compounds such as divinylbenzene; and the like can be given; polyisocyanate . Among them, industrially easily available, because it high reactivity, methyldichlorosilane, dimethyldichlorosilane, methyltrichlorosilane, tetrachlorosilane is preferable.

The surface protective film of the present invention, for example, after producing the base sheet (substrate layer) by extrusion molding, a method for applying or spraying the said pressure-sensitive adhesive composition is melted or dissolved liquid to the substrate sheet or, It can be prepared by a process of co-extrusion with the substrate material the pressure-sensitive adhesive composition using a T die with a method bonding the obtained substrate sheet adhesive sheet by an inflation method or a multilayer manifold. Among them, a method of manufacturing by coextrusion since multilayer sheet base layer and the adhesive layer are in close contact is obtained is preferred. The liquid was melted or dissolved adhesive composition of the present invention are also encompassed in the adhesive composition of the present invention.

<Application>
The surface protective film of the present invention, optical plate, a prism sheet, and can be suitably used for an adherend having irregularities such as the diffusion film, the invention is not limited thereto, for example, a smooth surface sheet it can be also used for surface protection.
Examples of the material constituting the sheet comprising the adherend is not particularly limited, a translucent resin such as acrylic resin, polycarbonate, and the like.

Hereinafter, the surface protective film of the present invention will be described in detail with reference to examples, but the present invention is not limited to the following examples.

(Synthesis examples of the copolymer composition)
Polymer block A
Added to the nitrogen-substituted reaction vessel, cyclohexane 500 parts by weight of an deaerating and dehydrating charged of styrene 20 parts by mass and tetrahydrofuran 5 parts by mass, the n- butyl lithium 0.13 parts by at 40 ° C. for polymerization initiation temperature There was subjected to Atsushi Nobori polymerization.
Polymer block B
After the polymerization conversion of the polymer A has reached approximately 100%, the reaction was cooled to 15 ° C., then 1,3-butadiene 70 parts by mass of styrene 10 parts by mass were added thereto to carry out a further thermally polymerized .

After the polymerization conversion reached approximately 100%, 0.06 parts by mass of methyl dichlorosilane was added as a coupling agent, to carry out a coupling reaction. After coupling was complete, it allowed to stand for 10 minutes while supplying hydrogen gas at a pressure of 0.4 MPa-Gauge. Some extraction polymers, vinyl content 64%, weight average molecular weight of about 110,000, was 60% coupling ratio.

Thereafter, the reaction vessel, diethylaluminum chloride 0.03 parts by weight and bis (cyclopentadienyl) titanium furfuryl oxychloride 0.06 parts by mass was added and stirred. Hydrogen gas supply pressure 0.7 MPa-Gauge, a hydrogenation reaction at a reaction temperature of 80 ° C. to start, when the absorption of hydrogen has ended, by extracting the reaction solution ambient temperature, returned to atmospheric pressure, from the reaction vessel, the polymer (i) and the polymer to obtain a copolymer composition comprising (ii) (Table 1 synthesis example 1).
Hereinafter, similarly engineered to give the desired copolymer composition (Synthesis Examples 2 to 24 of Table 1). The properties of these copolymer composition shown in Table 1.
In Table 1, "St (A + B)", "St (B)", "St (A)", and "St (b)" respectively represent the numbers is defined as follows. In the definition, the term "total polymer" means the whole of the polymer (i) and polymer (ii).
"St (A + B)" is an aromatic alkenyl compound unit content of the total polymer, means a numerical value represented by the following formula. Note that this is equal to the sum of the following as "St (B)" and following "St (A)".
formula:
St (A + B) = (alkenyl aromatic unit weight of the total polymer) / (total monomer units weight of the total polymer) × 100 (wt%)
"St (B)" means a numerical value represented by the following formula.
formula:
St (B) = (alkenyl aromatic unit weight of the total polymer block in B) / (total monomer units weight of the total polymer) × 100 (wt%)
"St (A)" means a numerical value represented by the following formula.
formula:
St (A) = (alkenyl aromatic unit weight of the total polymer block A) / (total monomer units weight of the total polymer) × 100 (wt%)
"St (b)" is an aromatic alkenyl compound unit content of the polymer block B, and means a numerical value represented by the following formula.
formula:
St (b) = (alkenyl aromatic unit weight of the total polymer block in B) / (total polymer the total monomer units weight of the block B) × 100 (wt%)
In Table 1, "A: B" represents the weight ratio of the total amount of polymer block A and the total amount of the polymer block B.
In Table 1, "(i) :( ii)" represents the weight ratio of the polymer (i) and polymer (ii).
In Table 1, "conjugated diene content" refers to a conjugated diene unit content of the polymer block B.
In Table 1, "vinyl bond content" refers to a content of vinyl bond of polymer block B.

[Table 1]

Figure JPOXMLDOC01-appb-I000001

(Examples 1-8, Comparative Examples 1-7)
Each copolymer composition obtained by the synthesis methods described above (Table 2) in 100 parts by weight as a tackifier, ARKON P100 (Arakawa Chemical Industries, Ltd.) 30 parts by weight, Irganox 1010 as an antioxidant (manufactured by Ciba Specialty Chemicals) were blended 1 part by weight, to obtain each adhesive composition. It shows the composition in Table 2 below.
Using polypropylene based material (manufactured by Prime Polymer Co., Ltd. J715M), T-die method by By coextruding the substrate and the pressure-sensitive adhesive composition, the base layer having a thickness of 34μm and 6μm adhesive layer having a thickness of bets are laminated and integrated, by forming a surface protective film of example 1-8, and Comparative examples 1-7, to obtain a wound body which wound on a paper core having an inner diameter of 3 inches.

(Evaluation)
For each surface protective film obtained as described above were evaluated for the following. The results are shown in Table 3.

(1) as film-forming property described above was visually evaluated the appearance of each surface protective film was formed by coextrusion, and as "○" if there is no appearance problem.
(2) the initial adhesion the surface protective film was adhered so as to cover the lens surface of the prism sheet having irregularities. The prism sheet, the thickness is made from an acrylic resin of 130 .mu.m, the pitch 50μm prism was prepared as a height of 25 [mu] m. Paste conditions, at room temperature 23 ° C. and a relative humidity of 50%, using a crimping rubber roller 2kg each affixed at 300 mm / min and allowed to stand for 30 minutes in this state, conforming to JIS Z0237 , 180 degree peel strength in 25mm width was measured at 300 mm / min. Peeling direction when this was ridgeline direction of the prism. The measured peel strength in this way has an initial adhesive force.
(3) over time adhesive strength each surface protective film, at room temperature 23 ° C. and a relative humidity of 50%, the prism surface of the sheet used for the initial adhesion evaluation (2), respectively, using a pressure bonding rubber roller 2kg , it was stuck at 300mm / min. Thereafter, sandwiched pasted prism sheet of the surface protection film of a polycarbonate plate (thickness 2 mm), the pressure of 6.0 × 10 -3 MPa added, 60 ° C. and a relative humidity of 90% under an environment in that state for 48 hours It was left unattended and. It was taken out to room temperature and allowed to stand for 30 minutes, conforming to JIS Z0237, a 180 degree peel strength in 25mm width was measured at 300 mm / min.
The peel strength measured in this manner and aging adhesive force was calculated rate of change over time the adhesive force (adhesive Koshin rate) by the following equation from the initial adhesive strength.
The rate of change (pressure-sensitive Koshin ratio) = (time adhesive strength / initial adhesive strength) × 100
(4) except for changing the rewinding speed wound body conforms to JIS Z0237, rewind at 15 m / min unwinding speed force 50mm width of each surface protective film of the deployment force Examples and Comparative Examples measured, as a developing force.

[Table 2]

Figure JPOXMLDOC01-appb-I000002

[Table 3]

Figure JPOXMLDOC01-appb-I000003

<Criteria>
Pressure-sensitive adhesive force (initial)
○ (Good): 0.1 N / 25 mm or more × (poor): 0.1 N / 25 mm less than the adhesive strength (rate of change)
◎ (excellent): less than 200% ○ (good): 200% to 500% or less × (bad): 500% ultra-deployment force ◎ (Yu): 2.0N / less than 50mm ○ (good): 2.0N / 50mm more than 3.5N / 50mm or less × (bad): 3.5N / 50mm more than

(Example 9)
To 100 parts by weight of the copolymer composition of Synthesis Example 4, as a tackifier, ARKON P100 (manufactured by Arakawa Chemical Industries, Ltd.) 18 parts by weight, (manufactured by Ciba Specialty Chemicals Inc.) Irganox 1010 as an antioxidant 1 part by weight , Tinuvin 326 (manufactured by Ciba Specialty Chemicals Inc.) were blended 0.5 part by weight of an ultraviolet absorber to obtain a pressure-sensitive adhesive composition by kneading.
Using polypropylene based material (manufactured by Prime Polymer Co., Ltd. J715M), and T-die method by by coextruding a base adhesive composition, the base layer having a thickness of 34μm and 6μm thick adhesive layer There was molded a surface protective film which is laminated and integrated to obtain a wound body which wound on a paper core having an inner diameter of 3 inches.

(Example 10, 11, 13, Comparative Examples 8-10)
As shown in Table 4, it blended adhesive composition, to obtain a wound body of the surface protective film in the same manner as in Example 9.

(Example 12)
The copolymer 100 parts by weight of the composition of Synthetic Example 7, as a tackifier Clearon P125 except for using an adhesive composition containing (Yasuhara Chemical Co., Ltd.) 40 parts by weight in the same manner as in Example 9 to obtain a wound body of surface protection film.

(Evaluation)
For each surface protective film obtained as described above were evaluated for the following.
The results are shown in Table 5.

(1) viscoelastic spectrum of tanδ peak temperature pressure-sensitive adhesive layer, a dynamic viscoelasticity spectrometer (IT Measurement and Control Co., No.: DVA-200), the frequency 10 Hz, at a heating rate 6 ° C. / min -50 ° C. was measured in the range of ~ 80 ° C., were obtained becomes maximum temperature of tan [delta (tan [delta peak temperature).

(2) Each surface protective film of the initial adhesion Examples and Comparative Examples was stuck to cover the lens surface of the prism sheet having irregularities. The prism sheet, the thickness is made from an acrylic resin of 130 .mu.m, the pitch 50μm prism was prepared as a height of 30 [mu] m. Paste conditions, at room temperature 23 ° C. and a relative humidity of 50%, using a crimping rubber roller 2kg each affixed at 300 mm / min and allowed to stand for 30 minutes in this state, conforming to JIS Z0237 , 180 degree peel strength in 25mm width was measured at 300 mm / min. Peeling direction when this was ridgeline direction of the prism. The measured peel strength in this way has an initial adhesive force.

(3) except for changing the speed rewind the windings of the 50mm width of the surface protective film of the deployment force Examples and Comparative Examples conforming to JIS Z0237, back fast winding at 20 m / min unwinding speed force It was measured, as a developing force.

[Table 4]

Figure JPOXMLDOC01-appb-I000004

[Table 5]

Figure JPOXMLDOC01-appb-I000005

<Criteria>
Initial adhesion ○ (good): 0.1N / 25mm or more × (poor): less than 0.1N / 25mm deployment force ◎ (Yu): 2.5N / 50mm or less ○ (good): 3.5N / 50mm or less × (bad): 3.5N / 50mm more than

(Example 14)
A pressure-sensitive adhesive layer:
The copolymer 100 parts by weight of the composition of Synthetic Example 4, 10 weight ARKON P100 (Arakawa Chemical Industries, Ltd.) 50 parts by weight, ENDEX155 as styrenic block phase reinforcing agent (manufactured by Eastman Chemical Co.) as a tackifier parts, Irganox 1010 (Chiba Specialty Chemicals Co., Ltd.) were blended 1 part by weight as an antioxidant to obtain a pressure-sensitive adhesive composition by kneading.

The base layer:
A base material made of polypropylene with (Prime Polymer Co. J715M), coextruded with an adhesive composition obtained above by T-die method, a polypropylene substrate layer having a thickness of 34 .mu.m, the adhesive agent 6μm thick laminated the integrated surface protective pressure sensitive adhesive sheet wound around the paper core having an inner diameter of 3 inches to obtain a wound body.

(Examples 15-19, Comparative Examples 11-14)
As shown in Table 6 below, were blended adhesive composition, to obtain a wound body of the surface protective film in the same manner as in Example 14.
Incidentally, "St / adhesive layer (wt%)" in Table 6, the ratio of the total weight of the entire aromatic alkenyl compound units to the weight of the adhesive, the copolymer composition and styrenic block phase reinforcing agent ( an aromatic alkenyl compound unit content). Further, "St / adhesive layer (-TF) (wt%)", the entire to the total weight of the copolymer composition and a styrene-based block phase reinforcing agent, the copolymer composition and styrenic block phase reinforcing agent It shows the percentage of the total weight of the aromatic alkenyl units.

(Evaluation)
For each surface protective film obtained as described above were evaluated for the following. The results are shown in Table 7.

(1) viscoelastic spectrum of tanδ peak temperature pressure-sensitive adhesive layer, a dynamic viscoelasticity spectrometer (IT Measurement and Control Co., No.: DVA-200), the frequency 10 Hz, at a heating rate 6 ° C. / min -50 ° C. was measured in the range of ~ 80 ° C., was determined temperature at which the maximum tan [delta.

(2) Each surface protective film of the initial adhesion Examples and Comparative Examples was stuck to cover the lens surface of the prism sheet having irregularities. The prism sheet, the thickness is made from an acrylic resin of 130 .mu.m, the pitch 50μm prism was prepared as a height of 30 [mu] m. Paste conditions, at room temperature 23 ° C. and a relative humidity of 50%, using a crimping rubber roller 2kg each affixed at 300 mm / min and allowed to stand for 30 minutes in this state, conforming to JIS Z0237 , 180 degree peel strength in 25mm width was measured at 300 mm / min. Peeling direction when this was ridgeline direction of the prism. The measured peel strength in this way has an initial adhesive force.
(3) over time adhesive strength each surface protective film, at room temperature 23 ° C. and a relative humidity of 50%, the prism surface of the sheet used for the initial adhesion evaluation (2), respectively, using a pressure bonding rubber roller 2kg , it was stuck at 300mm / min. Thereafter, sandwiched pasted prism sheet of the surface protection film of a polycarbonate plate (thickness 2 mm), the pressure of 6.0 × 10 -3 MPa added, 60 ° C. and a relative humidity of 90% under an environment in that state for 48 hours It was left unattended and. It was taken out to room temperature and allowed to stand for 30 minutes, conforming to JIS Z0237, a 180 degree peel strength in 25mm width was measured at 300 mm / min.
The peel strength measured in this manner and aging adhesive force was calculated rate of change over time the adhesive force (adhesive Koshin rate) by the following equation from the initial adhesive strength.

The rate of change (pressure-sensitive Koshin ratio) = (time adhesive strength / initial adhesive strength) × 100

(4) except for changing the speed rewind the windings of the 50mm width of the surface protective film of the deployment force Examples and Comparative Examples conforming to JIS Z0237, back fast winding at 20 m / min unwinding speed force It was measured, as a developing force.

[Table 6]

Figure JPOXMLDOC01-appb-I000006

[Table 7]

Figure JPOXMLDOC01-appb-I000007

<Criteria>
Pressure-sensitive adhesive force (initial)
○ (good): 0.1N / 25mm or more △ (Yes): 0.05N / 25mm more than 0.1N / 25mm less than × (bad): 0.05N / 25mm less than the pressure-sensitive adhesive force (rate of change)
◎ (excellent): less than 200% ○ (good): 200% to 500% or less × (bad): 500% ultra-deployment force ○ (good): 3.5N / 50mm or less × (bad): 3.5N / 50mm Super

(Example 20)
Co-extrusion by a T-die method, deposited substrate layer (thickness 34 .mu.m) / prism sheet for a surface protective film of the pressure-sensitive adhesive layer (thickness 6 [mu] m) (width 700 mm), to obtain a wound body winding length 100m It was. To 100 parts by weight of copolymer versus composition of the material synthesized in Example 13 to form an adhesive layer, 30 weight softening point 125 ° C. alicyclic saturated petroleum resin ARKON P125 (manufactured by Arakawa Chemical Industries, Ltd.) as a tackifier parts, 20 parts by weight ENDEX155 (manufactured by Eastman Chemical Co.) as the styrenic block phase reinforcing agent, Irganox 1010 (manufactured by Ciba Specialty Chemicals Inc.) 1 part by weight of an antioxidant, a UV absorber, Tinuvin 326 (Ciba Specialty Chemicals Inc.) were blended 0.5 part by weight were kneaded by a biaxial extruder used was pelletized. And the material forming the substrate layer block PP100 parts, films (block polypropylene (block PP) 100 parts by weight as the base material, and the adhesive layer, the copolymer composition 100 weight Synthesis Example 13 as an adhesive parts and Alcon P125 (manufactured by Arakawa chemical Industries, Ltd.) 30 parts as a tackifier, 20 parts by weight ENDEX155 (manufactured by Eastman chemical Co.) as the styrenic block phase reinforcing agent, Irganox 1010 (Ciba Specialty chemicals as an antioxidant Company Ltd.) 1 part by weight, as an ultraviolet absorber, Tinuvin 326 (manufactured by Ciba Specialty Chemicals Inc.) containing 0.5 parts by weight) portion 10 parts by weight of trimmed film end portions in order to adjust the winding shape during molding roll after mixing the door, kneaded by a biaxial extruder, a material obtained by pelletization It had.

(Examples 21 to 25)
The amount of tackifier as shown in Table 8 below and styrenic block phase reinforcing agent (herein sometimes abbreviated as St based block reinforcing agent.) Other than changing the amount of implementation to obtain a wound body of the surface protective film prism sheet in the same manner as example 20.
Incidentally, "St / adhesive (wt%)" in Table 8, the ratio of the total weight of the entire aromatic alkenyl units to the weight of the adhesive, the copolymer composition and styrenic block phase reinforcing agent (Aromatic an alkenyl compound unit content).

(Evaluation)
The items described in the following (1) to (4), and the evaluation test of the surface protective film of Example 20-25. The results are shown in Table 9.
(1) Each surface protective film of the initial adhesion Examples and Comparative Examples was stuck to cover the lens surface of the prism sheet having irregularities. The prism sheet, the thickness is made from an acrylic resin of 130 .mu.m, it was used pitch 50μm prism what is the height 30 [mu] m. Paste conditions, at room temperature 23 ° C. and a relative humidity of 50%, using a crimping rubber roller 2kg each affixed at 300 mm / min, was allowed to stand for 1 hour in that state, conforming to JIS Z0237 and, the 180 degree peel strength in 25mm width was measured at 300 mm / min. The measured peel strength in this way has an initial adhesive force.

(2) Each surface protective film over time adhesion Examples and Comparative Examples, room temperature 23 ° C. and a relative humidity of 50%, the early adhesion prism surface of the sheet used in the evaluation, the 2kg each (1) using a crimping rubber roller, it was stuck at 300mm / min. Thereafter, scissors pasted prism sheet of the surface protection film of a polycarbonate plate (thickness 2 mm), it added pressure of 0.3 N / cm 2, under 70 ° C. environment in that state, and allowed to stand 24 hours. Then, after it allowed to stand for 1 hour under an environment of room temperature 23 ° C. and 50% relative humidity, conforming to JIS Z0237, a 180 degree peel strength in 25mm width was measured at 300 mm / min. The peel strength measured in this manner and aging adhesive force was calculated rate of change over time the adhesive force (adhesive Koshin rate) by the following equation from the initial adhesive strength.

The rate of change (pressure-sensitive Koshin ratio) = (time adhesive strength / initial adhesive strength) × 100

(3) storage modulus G '
The storage modulus of the pressure-sensitive adhesive layer, a dynamic viscoelasticity spectrometer (IT Measurement and Control Co., No.: DVA200), the frequency 1 Hz, at a heating rate 3 ° C. / min, the range of -50 ℃ ~ + 150 ℃ in was measured to determine the storage modulus G 'at 70 ° C..

(4) the amount of bite surface protective film, at room temperature 23 ° C. and a relative humidity of 50%, the surface of the prism sheet, using a crimping rubber roller 2kg each, was affixed by 300 mm / min. The prism sheet was used pitch 50μm prism what is the height 30 [mu] m. Thereafter, scissors pasted prism sheet of the surface protection film of a polycarbonate plate (thickness 2 mm), a pressure of 0.3 N / cm 2, under 70 ° C. environment in that state, and allowed to stand 24 hours. Then peeling the surface protective film at a peel angle of 180 degrees an adhesive layer surface was observed by a laser microscope to measure the biting depth into the pressure-sensitive adhesive layer of the lens portion of the prism sheet.
Biting amount was calculated by the following equation.
Bite amount (%)
= (Biting depth into the adhesive layer of the lens portion of the prism sheet) / (pressure-sensitive adhesive layer thickness: 6 [mu] m) × 100

[Table 8]

Figure JPOXMLDOC01-appb-I000008

[Table 9]

Figure JPOXMLDOC01-appb-I000009

<Criteria>
Biting amount ○ (excellent): less than 1% or more 40% △ (Good): 40% to less than 80% × (poor): 80% adhesion (rate of change)
◎ (excellent): less than 150% ○ (good): 150% to 300% or less

(Example 26)
As shown in Table 10 below, in 100 parts by weight of the copolymer composition of Synthesis Example 14, Alcon P-125 (manufactured by Arakawa Chemical Industries, Ltd.) 30 parts by weight of alicyclic saturated petroleum resin as a tackifier It was added to obtain a pressure-sensitive adhesive composition.
On the other hand, a pressure-sensitive adhesive layer comprising the above adhesive composition, and block polypropylene (block PP) 75 parts by weight shown in Table 10, a substrate made of low density polyethylene (LDPE) resin composition containing a 25 parts by weight was prepared coextruded by a T-die method, 40 [mu] m polypropylene substrate thickness of the surface protective film and adhesive layer are laminated integrally of 6μm thickness.
(Examples 27-28 and Comparative Examples 15-19)
Except that changing the composition and thickness of the adhesive layer as shown in Table 10 below, to produce a surface protective film in the same manner as in Example 25, it was evaluated. All tackifier was Arkon P-125.
In Comparative Example 18 film-forming property was poor.

(Evaluation)
These surface protection film,
1) The projection of diameter 400μm and height 12 [mu] m, the prism sheet surface protective film was adhered in an atmosphere of 50 ° C. with a force of 0.8N / cm 2 when pressed for 24 hours, the lens portion of the prism sheet of, biting amount of the adhesive,
2) Initial adhesive force (vs prism faces), and 3) the initial adhesive force (vs flat surface)
It was measured and evaluated in the following manner.
Further in assessing biting lens portion of the prism sheet of the above 1),
4) prism scratch,
5) over time the adhesive force (vs prism surface)
6) were measured and evaluated the adhesive residue in the following manner.
further,
7) the deployment force was measured and evaluated in the following manner.
The results are shown in Table 11 below.
The surface protective film obtained in 1) the amount of bite above, the pressure-sensitive adhesive layer surface is adhered in contact with the lens surface of the prism sheet, a test piece was produced. The prism sheet, the lens portion is made of acrylic resin, the sheet consists of polyethylene terephthalate having a thickness of 150 [mu] m, the pitch of the prisms was prepared 50 [mu] m, as a height of 23μm and (BEF, 3M Sumitomo). Outer surface protective film pressure 5.9 × 10 5 Pa. Before pasting (i.e., the pressure-sensitive adhesive layer surface opposite) was added from pasted at 2m / min. The sticking using the following laminator affixed pressure was measured using a Fuji Film Business Supplies Co., Ltd. Prescale ultra low pressure.
Laminator Manufacturer: MCK (Ltd.)
Model: MRK-600
Roll: Heat resistant silicone roll roll diameter: ø80
The obtained test piece was cut into a size of 3 cm × 8 cm, was created sample piece.
Further, in order to prepare the projection used for the evaluation test, cutting the nylon fiber diameter 0.2mm the length 11 ~ 13 .mu.m by a cryomicrotome, fixing the cut pieces obtained on a slide glass, on which by sticking to a glass slide surface protective film obtained in the above in 2kg roller to fix the cut pieces between the slide glass and the surface protective film. Consequently formed convex (i.e., protrusions) was observed by a laser microscope, was determined its diameter and height.
The diameter and height of the convex shape used for the evaluation are shown below.
Diameter: 400μm
Height: 12μm
On the sample piece, the surface protective film with a slide glass having the convex shape, and set so that the surface protective film in contact with the sample piece and the convex shape, placing the weight of 200g on the slide glass (0 .8N / cm2), and allowed to stand for 24 hours at 50 ℃ of oven. The sample piece was taken out after 24 hours, and cut the section, observing the cross section by a scanning electron microscope (SEM), biting depth into the pressure-sensitive adhesive layer of the lens portion of the prism sheet ([mu] m) was measured.
Was calculated actually measured biting depth bite amount by the following formula from (μm) (%).
Bite amount (%)
= (Biting depth into the adhesive layer of the lens portion of the prism sheet) / (pressure-sensitive adhesive layer thickness: 6 [mu] m) × 100

2) Initial adhesive force (vs prism surface)
The surface protective film obtained above was applied so as to cover the lens surface of the prism sheet. Similarly, 1) and when attached, a pressure of 5.9 × 10 5 Pa from the outside of the surface protective film, paste at 2m / min, and allowed to stand for 30 minutes in a room at 23 ℃ ± 2 ℃.
Thereafter, conforming to JIS Z0237, 180 degree peel strength at 25 mm (unit N) and were measured by peeling in the direction parallel to the ridge line of the prism speed 300 mm / min and 30 m / min, initial adhesive force (vs prism ) and the.

3) Initial adhesive force (vs flat surface)
The surface protective film obtained in the above 1) as well as, in a room at pasting a flat acrylic sheet in the pressure 5.9 × 10 5 Pa and speed 2m / min conditions, 23 ° C. ± 2 ° C. 30 after standing min, conforming to JIS Z0237, a 180 degree peel strength in 25mm width (unit N), the measured at a peeling speed of 30 m / min conditions to the initial adhesive force (vs flat surface).
4) Upon testing the prism evaluation of scratches 1), peeling the surface protective film was removed from the oven from the prism sheet was visually observed whether a bright spot caused by scratches on the lens surface of the prism sheet.
In Table 10 below, given the × mark sample wound is often observed, given the △ mark if it is slightly observed, was subjected ○ mark if not observed at all.

5) over time the adhesive force (vs prism surface)
The obtained surface protective film, 2 to initial adhesion prism surface of the sheet used in the evaluation of), 1) as well as paste under a pressure of 5.9 × 10 5 Pa and speed 2m / min, 60 ° C. after standing for 1 week in an atmosphere of ± 2 ° C., conforming to JIS Z0237, a 180 degree peel strength in 25mm width, measured at a peeling speed of 300 mm / min. The peel strength measured in this manner and aging adhesive force, initial adhesive force (vs prism surface, peeling rate 300 mm / min) rate of change with time adhesive strength from the (adhesive Koshin rate) was calculated by the following equation.

The rate of change (pressure-sensitive Koshin ratio) = (time adhesive strength / initial adhesive force (vs prism surface, peeling rate 300 mm / min)) × 100
6) Upon testing in adhesive residue 5), in accordance with the measurement of the peel strength it was visually observed adhesive residue of the presence or absence of the lens surface of the prism sheet after peeling. Subjected × mark if adhesive residue is observed on the lens surface, if not observed at all was marked ○. The results are shown in Table 11 below.
7) except for changing the rewinding speed windings of the 50mm width of the surface protective film of the deployment force Examples and Comparative Examples conforming to JIS Z0237, a fast rewind force 20 m / min unwinding speed measured, as a developing force.

[Table 10]

Figure JPOXMLDOC01-appb-I000010

[Table 11]

Figure JPOXMLDOC01-appb-I000011

<Criteria>
Biting amount ○ (good): less than 1% or more 100% × (poor): less than 1%, 100%
Initial adhesive force (vs prism surface) peeling speed: 300 mm / min ○ (Good): 0.05 N / 25 mm or more × (bad): 0.05 N / 25 mm less than the adhesive strength (the rate of change, versus prism surface)
◎ (excellent): less than 200% ○ (good): 200% to 500% or less × (bad): 500% ultra-prism scratch evaluation ○: × can not see the flaws with the naked eye: adhesive residue evaluation that can check the wound with the naked eye ○: × adhesive residue of occurrence can not be confirmed with the naked eye: deployment force ○ (good) can check the adhesive residue generated by the visual: 3.5N / 50mm or less × (bad): 3.5N / 50mm more than

(Example 29)
Co-extrusion by a T-die method, deposited substrate layer (thickness 34 .mu.m) / prism sheet for a surface protective film of the pressure-sensitive adhesive layer (thickness 6 [mu] m) (width 700 mm), to obtain a wound body winding length 100m It was.
The material forming the adhesive layer, co the polymer 100 parts by weight of the composition, an alicyclic saturated petroleum resin ARKON P125 (manufactured by Arakawa Chemical Industries, Ltd.) 30 weight softening point 125 ° C. as a tackifier in Synthesis Example 13 parts, (manufactured by Eastman Chemical Company) ENDEX155 as styrenic block phase reinforcing agent, 10 parts by weight of Irganox 1010 (manufactured by Ciba Specialty Chemicals Inc.) 1 part by weight of an antioxidant, a UV absorber, Tinuvin 326 (Ciba Specialty Chemicals company Ltd.) 0.5 parts by weight were added and kneaded by a twin-screw extruder used was pelletized.
The material forming the substrate layer comprises a block PP 75 parts by weight, and 25 parts by weight of low density polyethylene (LDPR), as a partial (base material trimmed film end portions in order to adjust the winding shape during film forming roll block polypropylene (block PP) 100 parts by weight, and the adhesive layer, the copolymer 100 parts by weight of the composition, and Arkon P125 (manufactured by Arakawa chemical Industries, Ltd.) as a tackifier, 30 parts of synthesis example 13 as an adhesive, a styrene 20 parts by weight ENDEX155 (manufactured by Eastman Chemical Co.) as a system block phase reinforcing agent, Irganox 1010 (manufactured by Ciba Specialty Chemicals Inc.) 1 part by weight of an antioxidant, a UV absorber, Tinuvin 326 (Ciba Specialty Chemicals Inc. ) containing 0.5 parts by weight) was mixed with 10 parts by weight After, kneaded by a biaxial extruder used was pelletized.
Incidentally, "St / adhesive (wt%)" in Table 12, relative to the weight of the adhesive, the proportion of the total weight of the alkenyl aromatic units in the copolymer composition and styrenic block phase reinforcing agent (alkenyl aromatic compound unit content) indicating the.

(Examples 30-31, Comparative Examples 20-22)
Polyolefin The amount and type of substrate layer as shown in Table 12 below, the pressure-sensitive adhesive layer, the copolymer composition and a styrene content and the amount of tackifier and styrenic block phase reinforcing agent (i.e., St based block other than changing the amount of the reinforcing agent), to obtain a wound body of a prism sheet for a surface protective film in the same manner as in example 29.

(Evaluation)
The items described in the following (1) to (6), and the evaluation test of the surface protective films of Examples 29-31 and Comparative Examples 20-22. The results are shown in Table 13.

(1) using a surface roughness Ra (manufactured by Surftest SJ-301, Mitsutoyo Co.) was measured by the following measurement conditions.
(Measurement condition)
Measurements Length: 7.2mm
λc: 0.8mm
λs: 2.5μm
Measuring speed: 0.5mm / s
Further, JIS B0601: according to 2001, from the measured profile in the measurement conditions, waviness motif average height, and the waviness motifs average length calculated.

(2) Each surface protective film of the adhesion Examples and Comparative Examples was stuck to cover the lens surface of the prism sheet having irregularities. The prism sheet, the thickness is made from an acrylic resin of 130 .mu.m, it was used pitch 50μm prism what is the height 30 [mu] m. Paste conditions, at room temperature 23 ° C. and a relative humidity of 50%, using a crimping rubber roller 2kg each affixed at 300 mm / min, was allowed to stand for 1 hour in that state, conforming to JIS Z0237 and, the 180 degree peel strength in 25mm width was measured at 300 mm / min. Such a peel strength measured in the set to adhesion.

(3) Initial deployment force initial deployment force conforming to JIS Z0237 except for changing the speed rewind the windings of the 50mm width of the surface protective film, measured fast rewind force at speed 15 m / min unwinding did. The thus fast rewinding force was measured and the initial deployment force.

(4) time deployment force over time deployment force is compliant 50mm after the windings of the width is cured 1 week at room 40 ℃ ± 2 ℃, except for changing the rewinding speed JIS Z0237 of the surface protective film and measured the high-speed unwinding force in the unwinding speed 15m / min. The thus fast rewinding force was measured and the time deployment force. In the table, given the evaluation to ○ mark and feeding resistance is good when the time deployment force is less than 3N / 50 mm, × mark was evaluated as feed properties when more than 3N / 50 mm are defective It was subjected.

(5) a prism each surface protective film of the scratch evaluation examples and comparative examples were prepared paste specimen so as to cover the lens surface of the prism sheet having irregularities. The prism sheet was used similar to those used in the adhesion evaluation of (2). Applying a pressure of 5.9 × 10 5 Pa from the outside of the surface protective film upon sticking, stuck at 2m / min. Test pieces were cut into a size of 3 cm × 8 cm, was created sample piece.
Further, cutting the nylon fiber diameter 0.2mm the length 8 ~ 10 [mu] m by cryo microtome, the cut piece was fixed on a slide glass, the resulting surface protective film attached to the glass slide at 2kg roller, sample piece was fixed between the slide glass and the surface protective film to prepare a convex shape sample with a diameter of 400 [mu] m, height 10 [mu] m.
On a sample piece covering the lens unit with the surface protective film, the convex shape sample was set to overlap with the surface protective film covering the lens unit, put 140g of the weight on a slide glass, of 50 ° C. It was allowed to stand for 24 hours in an oven. A surface protective film removed specimen after 24 hours was peeled off from the prism sheet was visually observed whether a bright spot caused by scratches on the lens surface of the prism sheet. In Table 13 below, scratches sample × (bad) indicia often observed, when the △ (Good) indicia slightly observed, was subjected ○ (excellent) mark if not observed at all.

[Table 12]

Figure JPOXMLDOC01-appb-I000012
[Table 13]
Figure JPOXMLDOC01-appb-I000013
(Examples 32-38, Comparative Examples 23-29)
The copolymer 100 parts by weight of the composition obtained by the synthesis method described above, as a tackifier, Arkon P125 (Arakawa Chemical Industries, Ltd.) 5 parts by weight, Irganox 1010 (from Ciba Specialty Chemicals as an antioxidant ) was blended 1 part by weight to obtain an adhesive composition.
Using polypropylene based material (manufactured by Prime Polymer Co., Ltd. J715M), and T-die method by by coextruding a base adhesive composition, the base layer having a thickness of 34μm and 6μm thick adhesive layer There was molded a surface protective film which is laminated and integrated to obtain a wound body which wound on a paper core having an inner diameter of 3 inches.

(Evaluation)
For each surface protective film obtained as described above were evaluated for the following. The results are shown in Table 15.
(Evaluation)
For each surface protective film obtained as described above were evaluated for the following. The results are shown in Table 15.

(1) the appearance of the surface protective film was formed by film-forming property coextrusion was visually evaluated, and a "○" if there is no appearance problem.
(2) Each surface protective film of the initial adhesion Examples and Comparative Examples was stuck to cover the lens surface of the diffusion film (3M Co., DBEF). Paste conditions, at room temperature 23 ° C. and a relative humidity of 50%, using a crimping rubber roller 2kg each affixed at 300 mm / min and allowed to stand for 30 minutes in this state, conforming to JIS Z0237 , 180 degree peel strength in 25mm width was measured at 300 mm / min. Peeling direction when this was MD (machine direction) direction of the surface protective film. The measured peel strength in this way has an initial adhesive force.
(3) Each surface protective film over time adhesion Examples and Comparative Examples, room temperature 23 ° C. and a relative humidity of 50%, the early adhesion surface of the diffusion film used in the evaluation, the 2kg each (1) using a crimping rubber roller, it was stuck at 300mm / min. Thereafter, sandwiching the diffusion film pasted surface protective film of a polycarbonate plate (thickness 2 mm), the pressure of 6.0 × 10 -3 MPa added, 60 ° C. and a relative humidity of 90% under an environment in that state for 48 hours It was left unattended and. It was taken out to room temperature and allowed to stand for 30 minutes, conforming to JIS Z0237, a 180 degree peel strength in 25mm width was measured at 300 mm / min.
The peel strength measured in this manner and aging adhesive force was calculated adhesive Koshin rate over time adhesive strength by the following expression from the initial adhesive strength.
The rate of change (pressure-sensitive Koshin ratio) = (time adhesive strength / initial adhesive strength) × 100
(4) conforming to JIS Z0237 except for changing the speed rewind the windings of the 50mm width of the surface protective film of the deployment force the examples and comparative examples, 5 m / min, at 15 m / min unwinding speed to measure the unwinding force, as a developing force.

[Table 14]

Figure JPOXMLDOC01-appb-I000014

[Table 15]

Figure JPOXMLDOC01-appb-I000015
<Criteria>
Pressure-sensitive adhesive force (initial)
○ (Good): 0.05 N / 25 mm or more 0.35 N / 25 mm less × (bad): 0.05 N / 25 mm or less than 0.35 N / 25 mm or more adhesion (rate of change)
◎ (excellent): less than 200% ○ (good): 200% to 500% or less × (bad): 500% ultra-deployment force ◎ (Yu): 2.0N / less than 50mm ○ (good): 2.0N / 50mm more than 3.5N / 50mm or less × (bad): 3.5N / 50mm more than

The adhesive composition of the present invention, the prism sheet is preferably used in the adhesive layer of the surface protective film such as a diffusion film.
The surface protective film of the present invention, the prism sheet is preferably used for the surface protection of such diffusion film.

1 prism sheet 2 sheets 3 lens unit (prisms)
Top of the 3a lens unit (prism apex angle)
4 the first surface protecting film 5 base layer 6 adhesive layer 7 a second surface protecting film

Claims (9)

  1. Polymer (i): it comprises the following polymer block A and the following polymer block B, in the general formula [A-B] n (wherein, A is a polymer block A, B is a polymer block B, n is a copolymer (I) or its hydrogenated product having a structure represented by the representative.) an integer of 1-3,
    Polymer (ii): wherein the following polymer block A and the following polymer block B, (. The symbols in the formula represent the same meanings as defined above) the formula A-B-A or formula (A-B) x -Y (wherein, x is an integer of 1 or more, Y is a coupling agent residue, and other symbols represent. as defined above) copolymer having a structure represented by formula (II) or It contains a hydrogenated product thereof,
    The polymer (i) and the polymer entire alkenyl aromatic unit content of (ii) (St (A + B)) is 30 to 50% by weight,
    The polymer (i) and the polymer weight ratio of the total amount of the polymer block A included in each of (ii) and the total amount of the polymer block B (A: B) is 5:95 to 25: 75 in the range of PSA composition characterized in that it.
    Polymer block A:
    Alkenyl aromatic units are continuous, polymer block polymer block B composed mainly of an aromatic alkenyl compound units:
    Alkenyl aromatic conjugated diene unit and an aromatic alkenyl compound units is included in the random - a conjugated diene copolymer block, heavy aromatic alkenyl compound unit content (St (b)) is 10 to 35 wt% polymer block
  2. A surface protective film having a substrate layer, and a pressure-sensitive adhesive layer including the pressure-sensitive adhesive composition according to claim 1.
  3. The base layer is a polyolefin substrate layer,
    The pressure-sensitive adhesive composition further contains a tackifier, and the maximum and becomes the temperature is -10 ° C. ~ 20 ° C. of tanδ obtained by measuring the dynamic viscoelasticity at -50 ° C. ~ 80 ° C. of the pressure-sensitive adhesive layer the surface protective film according to claim 2, characterized in that it.
  4. The base layer is a polyolefin substrate layer,
    The pressure-sensitive adhesive composition of the tackifier, and further contains a styrenic block phase reinforcing agent,
    The polymer (i), the polymer (ii) and the aromatic alkenyl compound unit weight in the styrenic block phase reinforcing agent, the proportion (alkenyl aromatic compound unit content) to the weight of the pressure-sensitive adhesive layer, 20 the surface protective film according to claim 2, characterized in that a ~ 50 wt%.
  5. According to any one of claims 2 to 4, wherein the storage modulus G at 70 ° C. of the pressure-sensitive adhesive layer 'is 4.5 × 10 5 Pa ~ 6.0 × 10 5 Pa surface protection film.
  6. A surface protecting the prism surface of the prism sheet, is stuck on the prism surface, the prism apex angle of the prism surface in the case of a load of 0.3 N / cm 2 were loaded 24 hours in an atmosphere of 70 ° C. the surface protective film according to claim 5, biting depth of the adhesive, characterized in that less than 1% to 40% of the adhesive layer thickness.
  7. A protective prism surface of the prism sheet,
    Is affixed to the prism surface, the depth of bite into the pressure-sensitive adhesive layer of the prism apex angle of the prism surface when pressed against the opposite surface to the diameter 400μm of the projection height 12μm and the prism surface side surface protective film according to any one of claims 2 to 6 is characterized in that the pressure-sensitive adhesive layer is less than 1% to 100% of the thickness of.
  8. A protective prism surface of the prism sheet, the outer surface of the base layer, 0.7 surface roughness Ra of the ~ 2.0 .mu.m, 3 [mu] m or more waviness motifs average height, and 350μm or 600μm or less swell motifs surface protective film according to any one of claims 2 to 6, characterized in that it has an average length.
  9. Surface protective film according to any one of claims 2-5 which is for protecting the surface of the diffusion film.
PCT/JP2009/004549 2008-09-11 2009-09-11 Surface protective film WO2010029773A1 (en)

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