JP2003049132A - Surface protecting sheet - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain a surface protecting sheet having excellent rewinding properties free from problems of pollution, slightly increasing adhesive strength even in the case of preservation for many hours or at a high temperature and having excellent peelability in peeling from an adherend. SOLUTION: This surface protecting sheet is characterized in that the surface protecting sheet is obtained by forming a sheet of a substrate layer containing a polyolefin-based resin and an adhesive layer containing a styrene-based thermoplastic elastomer by coextrusion and the adhesive layer comprises 0.2-10 pts.wt. of a >=22C alkyl group-containing ester-based compound and 0.1-0.9 pt.wt. of a fatty acid amide-based compound based on 100 pts.wt. of the styrene-based thermoplastic elastomer.

Description

Detailed Description of the Invention

[0001]

TECHNICAL FIELD The present invention relates to a surface protective sheet. The surface protection sheet of the present invention is, for example, a metal plate,
It is used for the purpose of attaching and protecting the surfaces of painted metal plates, aluminum sashes, resin plates, decorative steel plates, vinyl chloride laminated steel plates, glass plates, etc. when they are transported, processed or cured.

[0002]

2. Description of the Related Art Conventionally, from the viewpoint of productivity and cost, a surface protective sheet is produced by forming a base material layer and an adhesive layer by a coextrusion method. Since such a surface protection sheet is used as a wound body or the like, in order to easily perform rewinding,
Mold release processing is performed. As a method of releasing the surface protective sheet, for example, a method of adding a fatty acid amide compound to a base material layer or an adhesive layer has been proposed (JP-A-57-13).
9163). However, in the mold release treatment method, when the number of added parts of the fatty acid amide compound is increased so that the mold release effect is exhibited, the fatty acid amide compound causes transfer to the surface of the adhesive layer, and further, it is not covered. There was a problem that it was transferred to the adhered body, causing contamination and reducing the adhesive strength. On the other hand, if the number of added parts of the fatty acid amide compound is reduced to the number of parts where contamination does not occur, a sufficient releasing effect cannot be obtained.

As a mold release treatment method with low contamination, for example, Japanese Patent Laid-Open No. 2-252777 proposes a method of rubbing the back surface of the base material layer with a roll or cloth. However, in the mold release treatment method, it is difficult to uniformly perform the friction treatment, and it may not be possible to obtain a good mold release property, and there is a problem that the rewinding force cannot be sufficiently reduced. . Further, the release treatment method by friction treatment alone has a poor release effect, and the variation in the friction treatment effect tends to become more remarkable as the production speed increases. This is because it is necessary to increase the relative speed of the friction processing rolls due to the increase in the production speed, and it is considered that the friction processing cannot be stably performed because of this. Further, the powder generated during the rubbing process is transferred to the adhesive layer, which causes the contamination of the adherend.

As an adhesive material formed into a film by the coextrusion method, for example, a styrene type thermoplastic elastomer is known. However, when the pressure-sensitive adhesive layer of the surface protective sheet is produced using these pressure-sensitive adhesive materials, for example, when the surface protective sheet is attached to an adherend and stored for a long time, its adhesive force increases. I will end up. In addition, when stored at a high temperature such as in a warehouse or a container in summer, the adhesive strength increases in a relatively short time. Such an increase in adhesive strength has a problem such as causing peeling failure.

[0005]

DISCLOSURE OF THE INVENTION The present invention relates to a surface protective sheet comprising a base material layer containing a polyolefin resin and an adhesive layer containing a styrene thermoplastic elastomer formed by coextrusion. It has good rewindability from a revolving body, has no problem of contamination, and has little increase in adhesive force even when stored for a long time or at high temperature, and peels from the adherend. It is an object of the present invention to provide a surface protective sheet which has a good releasability.

[0006]

As a result of intensive studies to solve the above problems, the present inventors have found the surface protection sheet shown below and completed the present invention.

That is, the present invention is a surface protection sheet in which a base material layer containing a polyolefin resin and an adhesive layer containing a styrene thermoplastic elastomer are formed by co-extrusion, wherein the adhesive layer is styrene. It is characterized by containing 0.2 to 10 parts by weight of an ester compound having an alkyl group having 22 or more carbon atoms and 0.1 to 0.9 parts by weight of a fatty acid amide compound with respect to 100 parts by weight of a thermoplastic elastomer. And a surface protection sheet.

The present invention is also a surface protection sheet in which a base material layer containing a polyolefin resin and an adhesive layer containing a styrene thermoplastic elastomer are formed by coextrusion, wherein the adhesive layer is styrene. 0.2 to 10 parts by weight of an ester compound having an alkyl group having 22 or more carbon atoms is contained in 100 parts by weight of a thermoplastic thermoplastic elastomer, and the base material layer is made of a polyolefin resin 10.
0.1 parts by weight of the fatty acid amide-based compound is added to 0 part by weight.
The present invention relates to a surface protective sheet containing 0.9 part by weight.

The surface protective sheet formed by coextrusion according to the present invention is obtained by using an ester compound having an alkyl group having 22 or more carbon atoms in combination with the fatty acid amide compound used as a release aid. , A new finding that a better rewinding property can be obtained as compared with the case where a fatty acid amide compound is used alone, and based on this finding, the cause of contamination in the combined system of the ester compound and the fatty acid amide compound By reducing the number of parts of the fatty acid amide-based compound to be obtained, good rewinding property and staining property are realized. Regarding the releasability to the adherend, the fatty acid amide-based compound alone has an effect as a release aid immediately after application, but the effect disappears at high temperature (for example, 60 ° C) or under long-term storage, resulting in poor release. However, by using the ester compound in combination, the effect as a peeling auxiliary agent is maintained even under high temperature or long-term storage, and good peelability is achieved. This is similar to the fatty acid amide compound, and when the ester compound is coextruded at a melting point or higher, it bleeds to the surface of the adhesive layer, which contributes to rewinding property and releasability without causing contamination. It is considered to be a thing.

[0010]

BEST MODE FOR CARRYING OUT THE INVENTION In the surface protective sheet of the present invention, a base material layer containing a polyolefin resin and an adhesive layer containing a styrene thermoplastic elastomer are formed by coextrusion. An ester compound having an alkyl group having 22 or more carbon atoms is contained, and a fatty acid amide compound is contained in the base material layer or the adhesive layer.

Examples of the ester compounds having an alkyl group having 22 or more carbon atoms include JP-A-11-131029.
It is possible to use those described in the publication. The alkyl group of the ester compound has 22 or more carbon atoms, preferably 26 or more carbon atoms, and more preferably 30 or more carbon atoms. When the alkyl group of the ester compound has less than 22 carbon atoms, the adhesive strength of the adhesive layer containing the same increases in a relatively short time when stored at high temperature (for example, 60 ° C.). . Further, the alkyl group of the ester compound is a straight chain,
Although it may be a branched chain, it is preferably a linear alkyl group from the viewpoint that the melting point of the ester compound becomes higher.

The melting point of such an ester compound is preferably 65 ° C. or higher, more preferably 70 to 110 ° C., and it can exist stably even when stored at high temperature or for a long time. The increase in adhesiveness is suppressed even when the surface protective sheet used in (1) is attached to an adherend and stored at high temperature or for a long time.

Such ester compounds are, for example,
Ester compounds (monoesters) of higher alcohols having an alkyl group having 22 or more carbon atoms, preferably 26 or more carbon atoms, and more preferably 30 or more carbon atoms with acid compounds such as carboxylic acid compounds, sulfuric acid, sulfurous acid, phosphoric acid, and phosphorous acid. Examples thereof include diesters and triesters. Examples of the carboxylic acid compound include monocarboxylic acids such as formic acid, acetic acid and benzoic acid, and polyvalent carboxylic acids such as oxalic acid, succinic acid and tricarballylic acid. Among these, monoesters, diesters or triesters of the above-mentioned higher alcohols and phosphoric acid are preferably used. The ester compound of the higher alcohol is produced by dehydrating the higher alcohol and the acid compound by heating under reflux in the presence of an acid catalyst such as hydrochloric acid in an organic solvent.

The above-mentioned higher alcohols include, for example,
Docosanol-1 (carbon number 22), tetracosanol-
1 (24 carbon atoms), hexacosanol-1 (2 carbon atoms)
6), octacosanol-1 (carbon number 28), nonacosanol-1 (carbon number 29), myricyl alcohol (carbon number 30), melysyl alcohol (carbon number 31), laxeryl alcohol (carbon number 32), celomeri. Syl alcohol (C33), tetratriacotanol-1 (C34), heptatriacotanol-1 (C35),
Examples thereof include tetratetracotanol-1 (having 44 carbon atoms).

As the ester compound having an alkyl group having 22 or more carbon atoms, an ester compound of a carboxylic acid compound having an alkyl group having 22 or more carbon atoms, preferably 26 or more, and more preferably 30 or more and an alcohol compound Is also illustrated.

The above ester compound is added in an amount of 0.2 to 10 parts by weight based on 100 parts by weight of the main polymer (styrene-based thermoplastic elastomer) of the adhesive layer. When the addition amount is small, the effect on the rewinding property and releasability due to the addition cannot be expected substantially, so the addition amount of the ester compound is 0
． It is preferably 2 parts by weight or more, more preferably 0.3 parts by weight or more, and particularly preferably 0.5 parts by weight or more. On the contrary, since the adhesive force tends to be lowered when the added amount is increased, the added amount of the ester compound is preferably 10 parts by weight or less, more preferably 7 parts by weight or less, and particularly preferably 5 parts by weight or less. The amount of the ester compound added is particularly preferably 0.3 to 7 parts by weight, more preferably 0.5 to 5 parts by weight.

As the fatty acid amide compounds, fatty acid amides and derivatives thereof can be used. The fatty acid amide preferably has about 11 to 21, more preferably 15 to 21 carbon atoms in the fatty acid. Examples of the fatty acid amide compound include stearic acid amide, oleic acid amide, lauric acid amide, palmitic acid amide, ricinoleic acid amide, oxystearic acid amide, erucic acid amide, and behenic acid amide. Further, as the fatty acid amide-based compound, secondary amides and tertiary amides such as the above-mentioned fatty acid amides such as ethylenebisstearic acid amide and methylenebisstearic acid amide and derivatives thereof can also be preferably used. These fatty acid amide compounds may be used alone or in combination.

The fatty acid amide compound may be added to either the base material layer or the adhesive layer. Further, it can be added to both the base material layer and the adhesive layer.

When the fatty acid amide compound is added to the adhesive layer, the amount thereof is 0.1 to 0.9 parts by weight based on 100 parts by weight of the main polymer (styrene-based thermoplastic elastomer). When the fatty acid amide compound is added to the base material layer, the amount of addition is 0.1 to 0.9 parts by weight based on 100 parts by weight of the polyolefin resin. Adhesive layer,
When added to any of the base material layers, the smaller the amount of the fatty acid amide compound added, the better in terms of contamination.
It is preferably not more than 0.7 parts by weight, more preferably not more than 0.7 parts by weight. On the other hand, in order to obtain the rewinding property, the larger the amount of the fatty acid amide-based compound added, the better. The amount of the fatty acid amide compound added is preferably 0.2 to 0.8 parts by weight, more preferably 0.3 to 0.7 parts by weight.

It is particularly effective to add the fatty acid amide compound to the base material layer. When the fatty acid amide compound is added to the base material layer, good rewinding property can be obtained even if the number of added parts is reduced. Moreover, the contamination property can be reduced by reducing the number of addition parts.

The polyolefin resin forming the base material layer is not particularly limited, and for example, polypropylene or a block-type or random-type propylene-based polymer comprising a propylene component and an ethylene component; low density, high density,
Ethylene polymers such as linear low density polyethylene; olefin polymers such as ethylene-α olefin copolymers, olefin polymers of ethylene components such as ethylene / vinyl acetate copolymers and ethylene-methyl methacrylate copolymers, and other monomers Polymers and the like can be preferably exemplified in view of problems such as film formation stability and incineration. These polyolefin resins may be used alone or in combination of two or more.

For the purpose of preventing deterioration and the like, the base material layer includes, for example, antioxidants, ultraviolet absorbers, light stabilizers such as hindered amine light stabilizers, antistatic agents, and also calcium oxide, Fillers such as magnesium oxide, silica, zinc oxide and titanium oxide, additives such as pigments, eye drool inhibitors, lubricants, antiblocking agents, foaming agents and polyethyleneimine can be added as appropriate.

The thickness of the base material layer is not particularly limited, but is usually about 20 to 300 μm, preferably 30 to 25.
It is 0 μm, more preferably 40 to 200 μm. Further, the base material layer may be a single layer or may be composed of two or more layers.

Examples of the styrene-based thermoplastic elastomer used for the adhesive layer include styrene / butadiene / styrene (SBS), styrene / isoprene / styrene (SIS), styrene / ethylene-butylene copolymer /
ABA type block polymers such as styrene (SEBS), styrene / ethylene-propylene copolymer / styrene (SEPS); styrene / butadiene (SB), styrene / isoprene (SI), styrene / ethylene / butylene copolymer AB block polymer such as polymer (SEB), styrene / ethylene-propylene copolymer (SEP), styrene random copolymer such as styrene / butadiene rubber (SBR), styrene / ethylene / butylene copolymer / A-B-C such as olefin crystals (SEBC)
Examples thereof include styrene / olefin crystal block polymers of the type, and hydrogenated products thereof. These styrene-based thermoplastic elastomers may be used alone or in combination of two or more.

In forming the adhesive layer, if necessary, for example, for controlling the adhesive properties, for example, a softening agent, an olefin resin, a silicone polymer, a liquid acrylic copolymer, a tackifier, an antiaging agent. , Hindered amine light stabilizers, UV absorbers, polyethyleneimine, etc.
For example, fillers such as calcium oxide, magnesium oxide, silica, zinc oxide, and titanium oxide, and additives such as pigments can be appropriately added. If necessary, the surface of the adhesive layer is subjected to surface treatment such as corona discharge treatment, ultraviolet ray irradiation treatment, flame treatment, plasma treatment or sputter etching treatment for the purpose of controlling adhesiveness or attaching workability. You can also

Among the above additives, addition of a tackifier is effective for improving the adhesive strength of the adhesive layer. Examples of the tackifier include petroleum-based resins such as aliphatic copolymers, aromatic copolymers, aliphatic / aromatic copolymers and alicyclic copolymers, and coumarone-indene resins. , Terpenic resin, terpene phenolic resin, rosin resin such as polymerized rosin, (alkyl) phenolic resin, xylene resin or hydrogenated products thereof, etc., commonly used for adhesives Any thing can be used without particular limitation. These tackifiers may be used alone or in combination of two or more. Hydrogenated tackifiers are preferred from the viewpoints of releasability and weather resistance. The tackifier may be a commercially available blend as a blend with an olefin resin.

When the tackifier is used, its addition amount is not particularly limited, but 100 parts by weight of the styrene-based thermoplastic elastomer is used from the viewpoint of improving the adhesive force while avoiding the problem of adhesive residue due to the decrease in cohesive force. On the other hand, it is preferably 80 parts by weight or less, more preferably 60 parts by weight or less, and particularly preferably 50 parts by weight or less.

Further, the addition of a softening agent as the above-mentioned additive is generally effective in improving the adhesive strength. Examples of the softening agent include low molecular weight diene-based polymers, polyisobutylene, hydrogenated polyisoprene, hydrogenated polybutadiene and their derivatives. Examples of the derivative include those having an OH group or a COOH group at one end or both ends, and specific examples include hydrogenated polybutadiene diol, hydrogenated polybutadiene monool, hydrogenated polyisoprene diol, and hydrogenated polyisoprene. Examples include monoalls. In particular, for the purpose of suppressing the improvement of the adhesiveness to the adherend, hydrogenated products of diene-based polymers such as hydrogenated polybutadiene and hydrogenated polyisoprene, olefin-based softening agents and the like are preferable. Specifically, the trade name "Kurapren LIR-200" manufactured by Kuraray Co., Ltd. and the like are available. These softening agents may be used alone or in combination of two or more.

The molecular weight of the softening agent is not particularly limited and can be set appropriately. However, if the molecular weight becomes small, it may cause substance transfer from the adhesive layer to the adherend or heavy peeling. However, since the effect of improving the adhesive strength tends to become poor as the molecular weight increases, the number average molecular weight of the softening agent is preferably about 5,000 to 100,000, particularly preferably 10,000 to 50,000.

When a softening agent is used, its addition amount is not particularly limited. However, since a large amount of the softening agent tends to increase the amount of adhesive residue at high temperature or during outdoor exposure, the styrene-based thermoplastic elastomer and the softening agent are softened. 40 parts by weight or less based on 100 parts by weight of the pressure-sensitive adhesive composition containing the agent, and further 2
It is preferably 0 parts by weight or less, particularly preferably 10 parts by weight or less.

The thickness of the pressure-sensitive adhesive layer is not particularly limited and may be appropriately determined according to the required adhesive strength, etc., but is usually about 1 to 50 μm, preferably 2 to 40 μm, more preferably 5 to 5 μm. It is 20 μm. Further, if necessary, a separator or the like can be temporarily attached and protected on the adhesive layer until it is put into practical use.

The surface protective sheet of the present invention is a pressure-sensitive adhesive layer-forming material containing a base material layer-forming material containing a polyolefin resin and a styrene-based thermoplastic elastomer, to which a predetermined amount of the ester compound or fatty acid amide compound is added. It is obtained by forming a base material layer and an adhesive layer by co-extrusion method using. The coextrusion method can be carried out according to the inflation method, T-die method or the like generally used for film production. The base material layer and the adhesive layer are coextruded in two layers or multiple layers. The surface treatment can be applied to the base material layer and the adhesive layer, if necessary.

[0033]

EXAMPLES The present invention will be described below with reference to examples.
The present invention is not limited to these.

Example 1 Low-density polyethylene (Tosoh Corp., Petrosen 180)
100 parts by weight of white pigment (manufactured by Dainichiseika, HCM
2035W) 4 parts by weight of the base material layer-forming material, and 100 parts by weight of styrene / ethylenebutylene / styrene polymer (Tuftec H1221 manufactured by Asahi Kasei Co., Ltd.) myricyl alcohol having 30 carbon atoms in the linear alkyl group. Phosphoric acid, an alkyl phosphoric acid ester (manufactured by Chukyo Yushi Co., Ltd., trade name Sepagent J-316, melting point 91
2 parts by weight and ethylenebisstearic acid amide (manufactured by Nippon Kasei) 0. Adhesive layer forming material added with 7 parts by weight,
A film was formed by a T-die method at a die temperature of 230 ° C. to obtain a surface protection sheet. At this time, the base material layer was 110 μm, and the adhesive layer was 5 μm.

Example 2 Low density polyethylene (Tosoh Corp., Petrosen 180)
A base layer forming material in which 0.4 parts by weight of ethylenebisstearic acid amide (manufactured by Nippon Kasei) is added to 100 parts by weight, and 100 parts by weight of styrene / ethylenebutylene / styrene polymer (manufactured by Asahi Kasei, Tuftec H1221). On the other hand, alkyl phosphoric acid ester which is a reaction product of myricyl alcohol having a linear alkyl group having 30 carbon atoms and phosphoric acid (manufactured by Chukyo Yushi Co., Ltd., trade name Sepagent J-31
6, melting point 91 ° C.) 2 parts by weight of the adhesive layer forming material,
A film was formed by a T-die method at a die temperature of 230 ° C. to obtain a surface protection sheet. At this time, the substrate layer was 110 μm, and the adhesive layer was 10 μm.

Example 3 In Example 2, as an adhesive layer forming material, hydrogenated petroleum resin (Arakawa Chemical Co., Alcon P, manufactured by Arakawa Chemical Co., Ltd.) was added to 100 parts by weight of styrene / ethylene butylene / styrene polymer (Tuftec H1041 manufactured by Asahi Kasei Corporation). -100) 20 parts by weight and an alkyl phosphate having a linear alkyl group with 50 carbon atoms (manufactured by Chukyo Yushi Co., Ltd., trade name Sepagent J-15
A surface protective sheet was obtained in the same manner as in Example 2 except that the pressure-sensitive adhesive layer-forming material added was 3 parts by weight. However, the substrate layer was 60 μm and the adhesive layer was 5 μm.

Example 4 In Example 2, 100 parts by weight of hydrogenated styrene-butadiene random polymer (Dinalon 1320P manufactured by JSR Co.) was used as the adhesive layer forming material, and the carbon number of the linear alkyl group was 22. Alkyl phosphate ester which is a reaction product of certain docosanol-1 and phosphoric acid (manufactured by Chukyo Yushi Co., Ltd., trade name Sepagent J-771, melting point 76
A surface protective sheet was obtained in the same manner as in Example 2 except that the pressure-sensitive adhesive layer-forming material added was 2 parts by weight. However, the substrate layer was 80 μm, and the adhesive layer was 5 μm.

Comparative Example 1 A surface protective sheet was prepared in the same manner as in Example 1 except that the alkyl phosphate was not added to the adhesive layer forming material.

Comparative Example 2 A surface protective sheet was prepared in the same manner as in Example 2 except that ethylenebisstearic acid amide was not added to the base layer forming material.

Comparative Example 3 In Example 3, except that the alkyl phosphate was not added to the adhesive layer forming material and the addition amount of ethylenebisstearic acid amide added to the base layer forming material was 1 part by weight. A surface protective sheet was prepared in the same manner as in Example 3.

Comparative Example 4 In Example 4, the adhesive layer forming material was replaced by a phosphoric acid ester type surfactant (trade name: phosphanol, manufactured by Toho Chemical Industry Co., Ltd.) instead of the alkyl phosphoric acid ester Sepagent J-771. A surface protection sheet was prepared in the same manner as in Example 4, except that RM-410 and the alkyl group having 9 carbon atoms) were added.

Comparative Example 5 In Example 1, a phosphoric acid ester type surfactant (trade name: phosphanol, manufactured by Toho Chemical Industry Co., Ltd.) was used as the adhesive layer forming material instead of the alkyl phosphoric acid ester, Sepergent J-316. RL-210, alkyl group having 1 carbon atom
A surface protective sheet was prepared in the same manner as in Example 1 except that 8) was added.

The surface protective sheets obtained in the examples and comparative examples were evaluated as follows. The results are shown in Table 1.

<Peeling force measuring method>
0.4mm thick BA finish stainless steel plate (SUS304
(BA) with 2 kg roller once reciprocating, and after 1 hour, pulling speed 30 m / min, peeling angle 180
The peeling force (initial) when peeled at 23 ° C / 50% RH was measured. Further, the peeling force when peeled under the above-mentioned conditions was measured after the bonding, the storage at 40 ° C. for 30 days, and the storage at 60 ° C. for 30 days.

<Measuring Method of Rewinding Force> A roll product of the surface protective sheet is cut into a width of 20 mm and stored at 40 ° C. for 30 days, and then a pulling speed of 30 m / min (23 ° C./50% R
The rewinding force at the time of rewinding in (H) was measured.

<Staining property> A surface protection sheet is 0.4 mm
2 on thick BA finish stainless steel plate (SUS304BA)
The pieces were stuck back and forth once with a kg roller, stored at 40 ° C. for 30 days, and then the surface protective sheet was peeled off at room temperature to visually confirm the state of contamination.

[0047]

[Table 1] From Table 1, it can be seen that the surface protective sheet of the present invention is excellent in releasability under heat, rewindability, and stain resistance.

   ─────────────────────────────────────────────────── ─── Continued front page    (72) Inventor Kazuto Okumura             1-2 1-2 Shimohozumi, Ibaraki City, Osaka Prefecture Nitto             Electric Works Co., Ltd. (72) Inventor Minoru Hanaoka             1-2 1-2 Shimohozumi, Ibaraki City, Osaka Prefecture Nitto             Electric Works Co., Ltd. (72) Inventor Yuki Kobayashi             1-2 1-2 Shimohozumi, Ibaraki City, Osaka Prefecture Nitto             Electric Works Co., Ltd. F-term (reference) 4F100 AH02B AH03A AH03B AK03A                       AK06 AK12B AL01 AL09B                       CA13 EH20 GB90 JL13B                       JL14 YY00A YY00B                 4J004 AA06 AA15 AA16 AA17 AB01                       AB03 CA04 DB01 DB02 EA01                       FA04                 4J040 CA081 DB011 DB051 HB30                       HC10 JA09 JB09 KA31 LA06                       MA02 MA05 MA10 NA12 PA23                       PA42

Claims (2)

[Claims] 1. A surface protection sheet in which a base material layer containing a polyolefin resin and an adhesive layer containing a styrene thermoplastic elastomer are formed by coextrusion, wherein the adhesive layer is a styrene thermoplastic resin. Elastomer 1
Surface protection characterized by containing 0.2 to 10 parts by weight of an ester compound having an alkyl group having 22 or more carbon atoms and 0.1 to 0.9 parts by weight of a fatty acid amide compound with respect to 00 parts by weight. Sheet. 2. A surface protective sheet in which a base material layer containing a polyolefin resin and an adhesive layer containing a styrene thermoplastic elastomer are formed by coextrusion, wherein the adhesive layer is a styrene thermoplastic resin. Elastomer 1
0.2 to 10 parts by weight of an ester compound having an alkyl group having 22 or more carbon atoms is contained per 00 parts by weight, and the base material layer is a fatty acid amide compound based on 100 parts by weight of a polyolefin resin. 0.1 to 0.9 parts by weight of the surface protective sheet.