JP2007320979A - Self-adhesive laminate - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an extremely useful self-adhesive laminate not only protecting the surface of an article, but also having cleaning degree of release surface, free from paste residues, satisfying stability of peel strength and the other various physical properties and further, reducing influence on resource depletion problem as much as possible and reducing load on environment. <P>SOLUTION: The self-adhesive laminate is composed of co-extrusion laminated film of at least three resin layers of a substrate layer, a self-adhesive layer and a separate substrate layer, and the substrate layer is consituted of a resin layer composed of a resin composition containing a polyolefin-based resin as a main component and the self-adhesive layer is constituted of a resin layer composed of a resin composition containing a self-adhesive resin as a main component and the separate substrate layer is constituted of a resin layer composed of a resin composition containing a polylactic resin as a main component. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a self-adhesive laminate, and more particularly, has a structure that has a sufficient function as a surface protective film, minimizes the influence on the resource depletion problem, and reduces the burden on the environment. The present invention relates to a useful self-adhesive laminate.

For example, various forms of self-adhesive films have been developed and proposed to protect the surface of various articles such as steel sheets, glass, or display products and panel components.
Thus, in the self-adhesive film as described above, the necessary physical properties include not only the protection of the surface of the article, but also, for example, the degree of cleanliness of the release surface, the absence of adhesive residue, and the peel strength. Various physical properties such as stability and others.
For this reason, in the self-adhesive film, various new technologies and new products have been developed and proposed in order to satisfy the above various physical properties. For example, in a self-adhesive film in which an adhesive layer constituting the self-adhesive film is formed by a coating method, a method of using a separate paper and maintaining the green degree of the surface has been proposed.
However, this method has an advantage that the degree of cleanliness can be maintained at a high level, but separate paper or the like must be laminated and peeled off during use, and its workability, etc. In addition, there are some problems such as separation paper and the like becoming garbage after use.
Further, for example, a group in which at least the inner surface is made of a thermoplastic resin composition containing 0.1 to 12 parts by weight of an inorganic filler with respect to 100 parts by weight of the thermoplastic resin and has a total thickness of 30 to 200 μm. A material layer and an adhesive layer having a thickness of 20 μm or less are extruded into a cylindrical shape with a multilayer coextrusion circular die with the adhesive layer inside, and after cooling the surface temperature of the cylindrical multilayer film to 50 ° C. or less, it is folded and taken off. A method for producing a surface protective film characterized by the above has been proposed (see, for example, Patent Document 1).
Furthermore, a separate material is attached to the film substrate via an adhesive layer, and the separate material is peeled off and attached to a transparent plate material such as a glass plate by the adhesive layer, the adhesive film being attached to the adhesive layer The pressure-sensitive adhesive film has a peel strength of 1.0 to 10.0 gf / 25 mm, and the pressure-sensitive adhesive layer includes a high-molecular pressure-sensitive adhesive having a molecular weight of 100,000 to 1,000,000. A pressure-sensitive adhesive film formed by applying to a substrate, and a pressure-sensitive adhesive film characterized in that the pressure-sensitive adhesive layer has a thickness of 10 to 40 μm have been proposed (for example, (See Patent Document 2 etc.).
JP-A-8-276485 Japanese Patent Laid-Open No. 11-80684

However, in the method for producing a surface protective film according to the above-mentioned Patent Document 1 and the like, although it has an advantage that the degree of cleanliness can be maintained at a high level, it is extremely difficult to control the processing process, and The operation is also complicated, and it is extremely difficult to produce a desired surface protective film.
Moreover, in the adhesive film according to the above-mentioned Patent Document 2 and the like, as described above, the separation material or the like becomes a lot of waste after use and is difficult to process after that. Further, the separation material is PET. Since it is composed of petroleum-derived resins such as synthetic resins, etc., it leads to resource depletion problems and the like.
Therefore, the present invention not only protects the surface of the article, but also satisfies various physical properties such as cleanliness of the peeled surface, no adhesive residue, stability of peel strength, etc. Another object of the present invention is to provide a very useful self-adhesive laminate having a structure that minimizes the influence on the resource depletion problem and reduces the load on the environment.

  As a result of various studies to solve the above problems, the present inventor comprises at least a three-layer coextruded laminated film of a base material layer, a self-adhesive layer, and a separate base material layer. The base layer is composed of a resin layer made of a resin composition mainly composed of a polyolefin-based resin, and the above self-adhesive layer is composed of a resin layer composed of a resin composition mainly composed of a self-adhesive resin. Further, the separate base material layer is composed of a resin layer made of a resin composition containing polylactic acid resin as a main component, and thus comprises such a three-layer resin layer coextruded laminated film. A self-adhesive laminate is manufactured, and thus the self-adhesive laminate is used. First, the self-adhesive laminate comprises a resin layer made of a resin composition mainly composed of a polylactic acid resin constituting the self-adhesive laminate. The separator base material layer is peeled off, and the self-adhesive resin The surface of the self-adhesive layer composed of the resin layer made of the resin composition is exposed, and the surface of the self-adhesive layer is exposed to the surface of various articles such as steel plates, glass, display products and panel parts, etc. When the self-adhesive laminate is laminated and bonded to the surface of the article, the self-adhesive laminate functions as a surface protective film that protects the surface of the article, and the occurrence of air pockets etc. is also recognized between the layers. In this case, the peel strength is stable, the degree of cleanness of the peeled surface is sufficiently maintained, and there is no adhesive residue. The present invention has been completed by finding that it is possible to produce a very useful self-adhesive laminate having a constitution that reduces the influence on the environment as much as possible and reduces the load on the environment.

  That is, the present invention comprises at least a three-layer coextruded laminated film of a base material layer, a self-adhesive layer, and a separate base material layer, and the base material layer is mainly composed of a polyolefin resin. The resin layer is composed of a resin layer, the self-adhesive layer is composed of a resin layer composed of a resin composition containing a self-adhesive resin as a main component, and the separate base material layer is The present invention relates to a self-adhesive laminate comprising a resin layer made of a resin composition containing a polylactic acid resin as a main component and comprising a coextruded laminate film of three resin layers.

The self-adhesive laminate according to the present invention uses a polyolefin-based resin as a material constituting the base material layer, and as a material constituting the self-adhesion layer, for example, ethylene-vinyl acetate copolymer, polypropylene, etc. The resin layer is composed of a resin composition mainly composed of a polyolefin-based resin as a base layer, and the self-adhesiveness as a self-adhesive layer. A resin layer composed of a resin composition containing a resin as a main component is constructed, and thus the two resin layers are laminated relative to each other to increase the close adhesion between the two as a self-adhesive laminate, This constitutes a self-adhesive laminate that functions as a surface protective film.
Further, in the present invention, as a material constituting the self-adhesive layer as described above, for example, ethylene-vinyl acetate copolymer, polypropylene or the like is used, and as a material constituting the separate substrate layer, Using a polylactic acid resin, utilizing the compatibility, affinity, etc. of both, a resin layer comprising a resin composition mainly composed of a self-adhesive resin as a self-adhesive layer is formed. As a material layer, a resin layer composed of a polylactic acid resin as a main component is constituted, and the two resin layers are laminated relative to each other, and the two are closely bonded as a self-adhesive laminate. The separation base layer can be easily peeled off from the surface of the self-adhesive layer and the surface of the self-adhesive layer is laminated on the surface of various articles and bonded together. Functions as a surface protection film It is to produce his own adhesive laminate.
Furthermore, in the present invention, a polylactic acid resin is used as a material constituting the separate substrate layer, and a resin layer is formed from a resin composition containing the polylactic acid resin as a main component. Forming a material layer has the advantage of minimizing the impact on the resource depletion problem, having biodegradability, decomposing in the natural environment, and extremely reducing the burden on the environment. A useful self-adhesive laminate can be produced.

Hereinafter, the present invention will be described in more detail with reference to the drawings.
First, FIG. 1 is a schematic cross-sectional view showing an example of the layer structure of the self-adhesive laminate according to the present invention, and FIGS. 2 and 3 are self-adhesive laminates according to the present invention shown in FIG. It is a schematic sectional drawing which shows the example about the structure which uses this and acts as a surface protection film.

  First, in the present invention, the self-adhesive laminate according to the present invention will be described. The self-adhesive laminate A according to the present invention includes, for example, at least a base material layer 1 and a self-adhesive layer 2 as shown in FIG. And a separate base layer 3 and a co-extruded laminated film 4, and the base layer 1 is composed of a resin layer 1 a made of a resin composition containing a polyolefin resin as a main component, Moreover, said self-adhesion layer 2 is comprised by the resin layer 2a by the resin composition which has a self-adhesive resin as a main component, Furthermore, said separate base material layer 3 has polylactic acid resin as a main component. It is composed of a resin layer 3a made of a resin composition, and a basic structure is a laminated structure composed of the three resin layers 1a, 2a, and 3a coextruded laminated film 4a.

The above illustrations are examples of the laminated structure of the self-adhesive laminate according to the present invention, and it goes without saying that the present invention is not limited thereto.
In addition, in the self-adhesive laminate according to the present invention, in addition to the base material layer, the self-adhesive layer, and the separate base material layer, for example, in order to strengthen the tight adhesion of both layers, Furthermore, it is also possible to use another resin composition and have a laminated structure of four layers or more.

Next, in the present invention, the self-adhesive laminate according to the present invention as described above is used, and the structure in which this acts as a surface protective film will be described. As shown in FIG. 2 and FIG. In the case of using the self-adhesive laminate A according to the present invention shown in FIG. 1, first, the self-adhesive laminate A according to the present invention shown in FIG. The separation base material layer 3 made of the resin layer 3a made of the resin composition mainly composed of the polylactic acid resin is peeled off, and the self made of the resin layer 2a made of the resin composition made mainly of the self-adhesive resin. The surface of the adhesive layer 2 is exposed (FIG. 2), and the surface of the self-adhesive layer 2 (2a) is overlaid on the surface of various articles 11 such as, for example, steel plates, glass, display products and panel parts, etc. Together By bonding the adhesive laminate A to the surface of the article 11, the self-adhesive laminate A are those that function as a surface protective film B for protecting the surface of the article (FIG. 3).
2 and 3, the meanings of reference numerals 1, 2, 3, 4, 1a, 2a, 3a, 4a, A, and the like represent the same meanings as those of the reference numerals in FIG.
The above exemplification uses the self-adhesive laminate according to the present invention and exemplifies the example of the structure that acts as a surface protective film, and the present invention is not limited to this. .

  Next, in the present invention, the materials constituting the self-adhesive laminate according to the present invention as described above, the production method thereof and the like will be described. First, in the present invention, the self-adhesive laminate according to the present invention is described. Examples of the polyolefin-based resin that forms the base layer constituting the material include polyethylene resins such as high-density polyethylene, medium-density polyethylene, low-density polyethylene, and the like, or polypropylene homopolymer, and α-olefin such as propylene and ethylene. Polypropylene resins such as block copolymers or random copolymers, and the like can be used.

In the present invention, examples of the high-density polyethylene include a density of about 0.942 g / cm ³ or more and a melt flow rate (MFR) in the range of about 0.5 to 12.0 g / 10 min. High density polyethylene can be used.
Thus, as the above high-density polyethylene, ethylene as a monomer, further propylene, 1-butene, 1-pentene, 4-methyl-1-pentene, 1-hexene, 1-heptene, 1-octene. Α-olefin such as 1-nonene, 1-decene, etc., for example, by using a polymerization method such as slurry method, solution method, gas phase method, etc., ethylene alone or other than ethylene It is possible to use an ethylene homopolymer obtained by copolymerization of an olefin and a copolymer of ethylene and another olefin.
In the present invention, melt flow rate (MFR) is measured from a method based on JIS K6921, and density is measured from a method based on JIS K7112.
The same applies hereinafter.

In the present invention, the medium density polyethylene specifically includes, for example, a density of about 0.930 to 0.941 g / cm ³ , and a melt flow rate (MFR) of 0.1. Medium density polyethylene in the range of ~ 15.0 g / 10 quantile can be used.
Thus, as the above medium density polyethylene, the monomer is ethylene, and further propylene, 1-butene, 1-pentene, 4-methyl-1-pentene, 1-hexene, 1-heptene, 1-octene. , 1-nonene, 1-decene, and other α-olefins, for example, high pressure method, slurry method, solution method, gas phase method, and other polymerization methods, ethylene alone, or An ethylene homopolymer obtained by copolymerizing ethylene and another olefin, a copolymer of ethylene and another olefin, or the like can be used.
In the present invention, the melt flow rate (MFR) is measured from a method based on JIS K6921, and the density is measured from a method based on JIS K7112.
The same applies hereinafter.

Next, in the present invention, as the low density polyethylene, specifically, for example, the density is about 0.910 to 0.929 g / cm ³ , and the melt flow rate (MFR) is 1. Low density polyethylene in the range of 0-10.0 g / 10 quantile can be used.
Thus, the above low density polyethylene includes, as a monomer, ethylene, propylene, 1-butene, 1-pentene, 4-methyl-1-pentene, 1-hexene, 1-heptene, 1-octene. , 1-nonene, 1-decene, and other α-olefins, for example, high pressure method, slurry method, solution method, gas phase method, and other polymerization methods, ethylene alone, or An ethylene homopolymer obtained by copolymerizing ethylene and another olefin, a copolymer of ethylene and another olefin, or the like can be used.
In the present invention, the melt flow rate (MFR) is measured from a method based on JIS K6921, and the density is measured from a method based on JIS K7112.
The same applies hereinafter.

Next, in the present invention, as the polypropylene, for example, the density is about 0.900 g / cm ³ , and the melt flow rate (MFR) is about 0.5 to 8.0 g / 10 min. It is possible to use polypropylene that is within range.
Specifically, as the polypropylene, it is preferable to use a polypropylene resin such as a homopolymer of propylene or a copolymer (copolymer) of propylene and an α-olefin such as ethylene.
In addition, as said polypropylene resin, the block copolymer (copolymer) or the random copolymer (copolymer) is used especially, Furthermore, the random copolymer (copolymer) is used. Is preferable.
Therefore, in the present invention, as the polypropylene, it is preferable to use a polypropylene resin having excellent melt tension and stretchability, etc., and having an extrusion moldability described later, specifically, in the main chain of the polypropylene resin. It is preferable to use those in which long chain branching is introduced to increase the tension in the molten state.

In the present invention, specifically, as a polypropylene resin excellent in melt tension and stretchability, a polypropylene resin composed of a block or random copolymer of propylene and ethylene or propylene and 1-octene is used. Is preferred.
Thus, in the polypropylene resin composed of a block or random copolymer of propylene and ethylene or propylene and 1-octene, the density is about 0.9 [g / cm ³ ]. The rate (MFR) is in the range of 0.1 to 10.0 [g / 10 min], and the melt tension is in the range of 100 [mN] or more (10 [cN] or more). Can be used.
Further, in the above, when the melt flow rate (MFR) is less than 0.1 [g / 10 minutes], the resin pressure increases during resin extrusion, giving a large load to the film forming machine, etc. In addition, those exceeding 10.0 [g / 10 min] are not suitable for the top blowing inflation film forming method and are not preferred because they do not blow upward. Furthermore, in the above, when the melt tension is less than 100 [mN] (less than 10 [cN]), it is not preferable because it is not suitable for the top blowing inflation film forming method.

  Next, in the present invention, as a self-thermoadhesive resin for forming a self-adhesive layer constituting the self-adhesive laminate according to the present invention, for example, a mixture of an ethylene-vinyl acetate copolymer and a terpene resin, A mixture of a polypropylene rubber and a terpene resin, a mixture of a thermoplastic elastomer and a terpene resin, or the like can be used.

As the ethylene-vinyl acetate copolymer, an ethylene copolymer for melt molding having a vinyl acetate content of 5 to 20% can be used.
In addition, as the above-mentioned polypropylene rubber, ethylene-propylene copolymer rubber, furthermore, rubber capable of sulfur vulcanization by introducing a double bond into the ethylene-propylene copolymer, propylene-butene copolymer system Rubber, etc. can be used.
For example, polypropylene resins and other modifying resins such as polypropylene resins can be added to the polypropylene rubber.
Furthermore, examples of the thermoplastic elastomer include styrene-butadiene-styrene block copolymer (SBS), styrene-isoprene-styrene block copolymer (SIS), or styrene-ethylene-butylene-styrene block copolymer ( It is possible to use a polystyrene-based thermoplastic elastomer such as SEBS), an ethylene-propylene block copolymer, or a polyolefin-based thermoplastic elastomer such as a blend type of polyethylene and polypropylene, and the like.
Thus, among the thermoplastic elastomers as described above, it has similar physical properties to the polylactic acid resin as a biodegradable resin, is excellent in compatibility, and is further excellent in melt tension and stretchability. It is desirable to use a polystyrene-based thermoplastic elastomer having extrudability.

Moreover, as said terpene-type resin, the terpene-type resin consisting of the homo- or copolymerization obtained by superposing | polymerizing terpene hydrocarbons, such as (alpha) -pinene, (beta) -pinene, limonene, or dipentene, can be used, for example.
The blending ratio of the terpene resin is about 10 to 50% by weight, preferably 15 to 15% by weight with respect to a base resin such as an ethylene-vinyl acetate copolymer, a polypropylene rubber, or a thermoplastic elastomer. It is preferable to mix within the range of about 40% by weight.

Moreover, in this invention, as a polylactic acid resin which forms the separate base material layer which comprises the self-adhesive laminated body which concerns on this invention, a melt flow rate (MFR) is 1.0-20.0g, for example. / 10 minutes, preferably within the range of 1.5 to 12.0 g / 10 minutes (190 ° C., 2.16 kg), the density is about 1.20 to 1.30 g / cm ³ , and the melting point is In the amorphous type, a polylactic acid resin in the range of Tg = 50 to 70 ° C. can be used.
Thus, as the above-mentioned polylactic acid resin, specifically, an aliphatic polyester resin using 1.4-butanediol and succinic acid as a main component and directly dehydrating polycondensation. It is possible to use a biodegradable polyester having a physical property similar to that of a polyolefin-based resin.
In the present invention, the above polylactic acid resin can be used alone, but for example, other biodegradable resins such as polybutylene succinate are added in an amount of about 1 to 30% by weight. It can also be used.
Thus, in the present invention, by adding other biodegradable resins such as polybutylene succinate as described above, it is effective in improving physical properties such as workability and rigidity. In the present invention, when other biodegradable resins such as polybutylene succinate are added in an amount of 30% by weight or more, rigidity and the like are increased, and impact resistance and the like may be lowered. There is nothing.
In the present invention, the polylactic acid resin is basically relatively soft and melts by heat and is compatible with the self-adhesive resin constituting the self-adhesive layer. , Have affinity, similar physical properties, etc., excellent melt tension and stretchability, etc., have coextrusion molding suitability described later, and adhere to each other with the above self-adhesive layer, thus the interlayer It is preferable to use polylactic acid heavy as a biodegradable resin that can reduce the adhesive strength of the resin, make it weakly adhesive, and can cause peeling between the layers.

  Next, in the present invention, each resin composition constituting the self-adhesive laminate according to the present invention will be described in more detail. First, in the present invention, the base material layer constituting the self-adhesive laminate according to the present invention. As the resin composition for forming, for example, the above-mentioned polyolefin resin as a main component of a vehicle, and further, if necessary, for example, when forming the film, for example, film processability, heat resistance, weather resistance Various plastic compounding agents for the purpose of improving and modifying mechanical properties, dimensional stability, antioxidant properties, slipping properties, mold release properties, flame retardancy, antifungal properties, electrical properties, strength, etc. 1 type or 2 types or more of additives and additives are optionally added, and further, if necessary, a solvent, a diluent and the like are added and kneaded sufficiently to constitute the self-adhesive laminate according to the present invention. Preparing a resin composition for forming a base material layer It can be.

  Further, in the present invention, as the resin composition for forming the self-adhesive layer constituting the self-adhesive laminate according to the present invention, for example, the above self-adhesive resin as a main component of the vehicle, If necessary, upon film formation, for example, film processability, heat resistance, weather resistance, mechanical properties, dimensional stability, antioxidant properties, slipperiness, mold release properties, flame retardancy, antifungal properties, For the purpose of improving and modifying electrical characteristics, strength, etc., one or more of various plastic compounding agents and additives are arbitrarily added, and if necessary, solvents, diluents, etc. Can be added and kneaded sufficiently to prepare a resin composition for forming a self-adhesive layer constituting the self-adhesive laminate according to the present invention.

  Next, as a resin composition for forming a separate substrate layer constituting the self-adhesive laminate according to the present invention, for example, a polylactic acid resin is a main component of a vehicle, and if necessary, When forming the film, for example, film processability, heat resistance, weather resistance, mechanical properties, dimensional stability, antioxidant properties, slipperiness, mold release properties, flame retardancy, antifungal properties, electrical properties For the purpose of improving and modifying strength, etc., one or more of various plastic compounding agents and additives are arbitrarily added, and if necessary, a solvent, a diluent, etc. are added. It is possible to prepare a resin composition which is sufficiently kneaded to form a separate substrate layer constituting the self-adhesive laminate according to the present invention.

  In the present invention, in each resin composition constituting the self-adhesive laminate according to the present invention, examples of the plastic compounding agent and additive include a lubricant, a crosslinking agent, an antioxidant, and an ultraviolet ray. Use absorbents, light stabilizers, fillers, reinforcing agents, antistatic agents, flame retardants, flame retardants, foaming agents, fungicides, pigments, dyes, dispersants, surfactants, antiblocking agents, etc. Furthermore, a modifying resin or the like can be used, and the addition amount thereof can be arbitrarily added from a very small amount to several tens of weight% depending on the purpose. .

Furthermore, in the above, as the compounding agent or additive, specifically, a lubricant having its own lubricity and little migration in the resin can be used. For example, liquid paraffin, white Vaseline, petroleum wax, microcrystalline wax, montan wax, polyethylene wax and the like, higher fatty acids having 8 to 22 carbon atoms, or higher fatty acid aluminum, higher fatty acid calcium, higher fatty acid magnesium higher fatty acid zinc, higher fatty acid lithium Higher fatty acids or metal salts thereof, linear aliphatic monohydric alcohols having 8 to 18 carbon atoms, glycerin, sorbitol, propylene glycol, pentaerythritol, triethylene glycol, etc. Aliphatic alcohols, higher fatty acids having 4 to 22 carbon atoms and straight chain aliphatics having 8 to 18 carbon atoms Esters with polyhydric alcohols, butyl acetyl citrate, di-2-ethyl-hexyl adipate, azelaic acid-n-hexyl, ethanediol montanate, poly (1.3-butanediol adipate) ester, acetylricino Methyl ester, poly (1.3-butylene glycol, 1.4-butylene glycol, octyl alcohol adipate) ester, ester of sugar sugar and fatty acid ester, hydrogenation Edible oils and fats, castor oil, spam acetyl wax, glycerides of acetylated monoglyceride sugar, ethylene bis-fatty acid amide represented by, for example, ethylene bisoleyl amide having 16 to 18 carbon atoms, higher fatty acid amide having 8 to 22 carbon atoms , Stearyl erucamide, erucic acid amide, oleyl palmitoamide, etc. 1 to 2 types of fatty acid amides, and other types such as methylhydrodiene polysiloxane, dimethyl polysiloxane, methylphenyl polysiloxane, silicone oil jarodine such as polyoxyalkylene dimethylpolysiloxane, and glycerin ester of maleic acid modified rosin The above can be used.
In the present invention, among the lubricants as described above, in particular, erucic acid amide, ethylene bis oleyl amide, stearic acid amide, oleic acid amide, methylene bis stearic acid amide, etc. themselves have lubricity, It is a very effective material.
As the addition amount of the above-mentioned lubricant, it is preferable to add at a ratio of about 0.08 wt% to 10.0 wt% with respect to the resin component.

In the present invention, other oxides such as aluminum oxide, magnesium oxide, silica, calcium oxide, titanium oxide, and zinc oxide; hydroxides such as aluminum hydroxide, magnesium hydroxide, and calcium hydroxide; Carbonates such as magnesium and calcium carbonate, sulfates such as calcium sulfate and barium sulfate, silicates such as magnesium silicate, aluminum silicate, calcium silicate and aluminosilicate, and others, kaolin, talc, diatomaceous earth, etc. Anti-blocking agent based on inorganic compounds, or high-density polyethylene, ultra-high molecular weight polyethylene having a molecular weight of 300000 or more, polypropylene, polycarbonate, polyamide, polyester, melamine resin, diallyl phthalate resin, acrylic resin, etc. Organic consisting of fine powder It one free of compounds based antiblocking agents can be added two or more.
The addition amount is preferably about 0.01 to 3% by weight with respect to the resin component.

  Next, in the present invention, a method for producing a self-adhesive laminate according to the present invention using each resin composition as described above will be described. In the present invention, first, as described above, each resin The composition is then prepared, and then the resin composition is used and the resin composition is co-extruded using, for example, a T-die co-extruder, an inflation co-extruder, etc. The self-adhesive laminated body which concerns on this can be manufactured.

Thus, in the present invention, a specific method for producing the self-adhesive laminate according to the present invention using each of the resin compositions as described above will be described. In the present invention, first, as described above, A resin composition for forming a base material layer constituting the self-adhesive laminate according to the present invention, a resin composition for forming a self-adhesive layer constituting the self-adhesive laminate according to the present invention, and the present invention. And a resin composition for forming a separate substrate layer constituting the self-adhesive laminate, and then using the three types of resin compositions, for example, a T-die co-extruder, Co-extrusion molding using an inflation co-extruder or the like, comprising at least a three-layer co-extrusion laminated film of a base material layer, a self-adhesive layer, and a separate base material layer. Resin composition mainly composed of polyolefin resin And the above self-adhesive layer is composed of a resin layer made of a resin composition containing a self-adhesive resin as a main component, and the separate substrate layer is made of a polylactic acid resin. The self-adhesive laminated body which consists of the resin layer by the resin composition which has as a main component, and consists of the coextruded laminated film of the three resin layers can be manufactured.
The above illustration is an example of the method for producing a self-adhesive laminate according to the present invention, and the present invention is not limited thereto.
In the present invention, as the self-adhesive laminate according to the present invention, other materials may be used depending on the purpose of use, application, etc., and these may be arbitrarily coextruded and laminated in various forms. An extruded multilayer laminated resin film can be designed and manufactured.

Next, in the present invention, the film thickness of the self-adhesive laminate according to the present invention is about 25 μm to 180 μm, preferably about 40 μm to 105 μm.
Thus, in the self-adhesive laminate according to the present invention, as the film thickness of each layer constituting the self-adhesive laminate, first, as the base material layer, the film thickness is about 20 μm to 100 μm, preferably 25 μm. About 50 μm, the self-adhesive layer has a thickness of about 5 μm to 30 μm, preferably about 5 μm to 25 μm, and the sebate base layer has a thickness of 5 μm to 50 μm, preferably about 10 μm to 30 μm. It is preferable to consist of a range.
In the above, as the film thickness of each layer constituting the self-adhesive laminate according to the present invention, first, as the film thickness of the base material layer, when the film thickness is less than 20 μm, the practical strength is low, and the protective film is peeled off In addition, it is not preferable because it is difficult to peel off smoothly, and if the film thickness exceeds 100 μm, it is not suitable for the environment, the cost is increased, and the weight of the product to be protected (by the film) is increased. It is not preferable for reasons such as.
Further, if the film thickness of the self-adhesive layer is less than 5 μm, it is not preferable because the molding process becomes difficult, and if it exceeds 30 μm, there is no need for the function of adhesion. Furthermore, it is not preferable because it causes a cost increase. Furthermore, when the thickness of the separate base material layer is less than 5 μm, the separation base material has a physical property, and when it is peeled off, it may cause problems such as tearing and tearing. It is not preferable, and if the film thickness exceeds 50 μm, there is no problem in terms of function, but it is not preferable because it causes a cost increase.

  Thus, in the present invention, the base material layer constituting the self-adhesive laminate according to the present invention has the effects of improving the overall physical properties, particularly strength, of the protective film. In addition, the self-adhesive layer constituting the self-adhesive laminate according to the present invention has effects such as adhesion to a product and its sustainability, and further, according to the present invention. The separate base material layer constituting the self-adhesive laminate exhibits operational effects such as convenience in handling and cleanliness of the self-adhesive surface.

As is clear from the above description, the self-adhesive laminate according to the present invention comprises at least a three-layer coextruded laminate film of a base material layer, a self-adhesive layer and a separate base material layer, and further, The base layer is composed of a resin layer made of a resin composition mainly composed of a polyolefin-based resin, and the above self-adhesive layer is composed of a resin layer composed of a resin composition mainly composed of a self-adhesive resin. Further, the separate substrate layer is composed of a resin layer made of a resin composition containing polylactic acid resin as a main component, and thus, with such a co-extruded laminated film of three resin layers, The self-adhesive laminate is composed of the self-adhesive laminate, and the self-adhesive laminate is used. First, a resin composition mainly composed of a polylactic acid resin constituting the self-adhesive laminate. The separate base material layer consisting of the resin layer is peeled off and The surface of the self-adhesive layer composed of a resin layer made of a resin composition containing a self-adhesive resin as a main component is exposed, and the surface of the self-adhesive layer is, for example, steel plate, glass, or display products and panel parts, etc. When the self-adhesive laminate is laminated on the surface of the article, the self-adhesive laminate functions as a surface protective film for protecting the surface of the article. .
Next, the present invention will be described more specifically with reference to examples.

(1). First, the following resin compositions (a), (b), and (c) were prepared.
(I). Resin composition constituting first layer As a base material layer, high-density polyethylene (trade name, Hi-Zex 3300F, density = 0.950 g / cm ³ , manufactured by Mitsui Chemicals, Inc., melt flow rate (MFR) = 1.1 g / 10 minutes) 100 parts by weight was sufficiently kneaded to prepare a resin composition.
Thereby, the stiffness, strength, abrasion resistance, etc. of the protective film itself are imparted.
(B). Resin composition constituting second layer As a self-adhesive layer, an ethylene-vinyl acetate copolymer (manufactured by Mitsui DuPont Polychemical Co., Ltd., trade name, EVAFLEX P1007, VA content = 10%, density = 0.930 g / cm ³ , melt index (MI) = 9.0 g / 10 min) 85.0 parts by weight and terpene resin (trade name, Clearon P-125, manufactured by Yashara Chemical Co., Ltd.) 15.0 parts by weight are sufficiently kneaded. A resin composition was prepared.
(C). Resin composition constituting the third layer Polylactic acid resin (trade name, Lacia H-100, manufactured by Mitsui Chemicals, density = 1.25 g / cm ³ , melt flow rate (MFR) as a separate substrate layer = 10 g / 10 min) 100 parts by weight were sufficiently kneaded to prepare a resin composition.
(2). Next, using the resin composition prepared above, using a three-type three-layer top-blown air-cooled inflation coextrusion film-forming machine, the layer of the resin composition of (A) is 45 μm, ( From the co-extruded inflation film having a total thickness of 70 μm of 3 types and 3 layers, co-extruded to a layer of 5 μm of the resin composition of (b) and 20 μm of the layer of the resin composition of (c) A self-adhesive laminate according to the present invention was produced.
The self-adhesive laminate produced above is not high in interlaminar strength between the second self-adhesive layer and the third separate base material layer and has an appropriate peel strength and appropriate adhesive strength. It was.

(1). First, the following resin compositions (a), (b), and (c) were prepared.
(I). Resin composition constituting first layer As a base material layer, high-density polyethylene (manufactured by Nippon Polyethylene Co., Ltd., trade name, Novatec HJ580N, density = 0.960 g / cm ³ , melt flow rate (MFR) = 11 g / 10 min. ) 100 parts by weight were sufficiently kneaded to prepare a resin composition.
Thereby, the stiffness, strength, abrasion resistance, etc. of the protective film itself are imparted.
(B). Resin composition constituting second layer As a self-adhesive layer, an ethylene-vinyl acetate copolymer (manufactured by Mitsui DuPont Polychemical Co., Ltd., trade name, EVAFLEX P1007, VA content = 10%, density = 0.930 g / cm ³ , melt index (MI) = 9.0 g / 10 min) 85.0 parts by weight and terpene resin (trade name, Clearon P-125, manufactured by Yashara Chemical Co., Ltd.) 15.0 parts by weight are sufficiently kneaded. A resin composition was prepared.
(C). Resin composition constituting the third layer Polylactic acid resin (trade name, Lacia H-100, manufactured by Mitsui Chemicals, density = 1.25 g / cm ³ , melt flow rate (MFR) as a separate substrate layer = 10 g / 10 min) 100 parts by weight were sufficiently kneaded to prepare a resin composition.
(2). Next, using the resin composition prepared above, using a three-type three-layer top-blown air-cooled inflation coextrusion film-forming machine, the layer of the resin composition of (A) is 45 μm, ( From the co-extruded inflation film having a total thickness of 70 μm of 3 types and 3 layers, co-extruded to a layer of 5 μm of the resin composition of (b) and 20 μm of the layer of the resin composition of (c) A self-adhesive laminate according to the present invention was produced.
The self-adhesive laminate produced above is not high in interlaminar strength between the second self-adhesive layer and the third separate base material layer and has an appropriate peel strength and appropriate adhesive strength. It was.

(1). First, the following resin compositions (a), (b), and (c) were prepared.
(I). Resin composition constituting first layer Polypropylene (trade name, Novatec FW4BT, density = 0.900 g / cm ³ , melt flow rate (MFR) = 6.5 g / 10 min as a base material layer ) 100 parts by weight were sufficiently kneaded to prepare a resin composition.
Thereby, the stiffness, strength, abrasion resistance, etc. of the protective film itself are imparted.
(B). Resin composition constituting second layer As a self-adhesive layer, an ethylene-vinyl acetate copolymer (manufactured by Mitsui DuPont Polychemical Co., Ltd., trade name, EVAFLEX P1007, VA content = 10%, density = 0.930 g / cm ³ , melt index (MI) = 9.0 g / 10 min) 85.0 parts by weight and terpene resin (trade name, Clearon P-125, manufactured by Yashara Chemical Co., Ltd.) 15.0 parts by weight are sufficiently kneaded. A resin composition was prepared.
(C). Resin composition constituting the third layer Polylactic acid resin (trade name, Lacia H-100, manufactured by Mitsui Chemicals, density = 1.25 g / cm ³ , melt flow rate (MFR) as a separate substrate layer = 10 g / 10 min) 100 parts by weight were sufficiently kneaded to prepare a resin composition.
(2). Next, using the resin composition prepared above, using a three-type three-layer top-blown air-cooled inflation coextrusion film-forming machine, the layer of the resin composition of (A) is 45 μm, ( From the co-extruded inflation film having a total thickness of 70 μm of 3 types and 3 layers, co-extruded to a layer of 5 μm of the resin composition of (b) and 20 μm of the layer of the resin composition of (c) A self-adhesive laminate according to the present invention was produced.
The self-adhesive laminate produced above is not high in interlaminar strength between the second self-adhesive layer and the third separate base material layer and has an appropriate peel strength and appropriate adhesive strength. It was.

(1). First, the following resin compositions (a), (b), and (c) were prepared.
(I). Resin composition constituting first layer As a base material layer, high-density polyethylene (trade name, Hi-Zex 3300F, density = 0.950 g / cm ³ , manufactured by Mitsui Chemicals, Inc., melt flow rate (MFR) = 1.1 g / 10 minutes) 100 parts by weight was sufficiently kneaded to prepare a resin composition.
Thereby, the stiffness, strength, abrasion resistance, etc. of the protective film itself are imparted.
(B). Resin composition constituting second layer As self-adhesive layer, styrene-ethylene-butylene-styrene copolymer (manufactured by JSR Corporation, trade name, Dynalon 1320P, PS content = 10%, density = 0.890 g / cm ^3. Melt index (MI) = 3.5 g / 10 min) 76.0 parts by weight and terpene resin (trade name, Clearon P-125, manufactured by Yashara Chemical Co., Ltd.) 24.0 parts by weight, and kneaded sufficiently A composition was prepared.
(C). Resin composition constituting the third layer Polylactic acid resin (trade name, Lacia H-100, manufactured by Mitsui Chemicals, density = 1.25 g / cm ³ , melt flow rate (MFR) as a separate substrate layer = 10 g / 10 min) 100 parts by weight were sufficiently kneaded to prepare a resin composition.
(2). Next, using the resin composition prepared above, using a three-type three-layer top-blown air-cooled inflation coextrusion film-forming machine, the layer of the resin composition of (A) is 45 μm, ( From the co-extruded inflation film having a total thickness of 70 μm of 3 types and 3 layers, co-extruded to a layer of 5 μm of the resin composition of (b) and 20 μm of the layer of the resin composition of (c) A self-adhesive laminate according to the present invention was produced.
The self-adhesive laminate produced above is not high in interlaminar strength between the second self-adhesive layer and the third separate base material layer and has an appropriate peel strength and appropriate adhesive strength. It was.

(1). First, the following resin compositions (a), (b), and (c) were prepared.
(I). Resin composition constituting first layer As a base material layer, high-density polyethylene (manufactured by Nippon Polyethylene Co., Ltd., trade name, Novatec HJ580N, density = 0.960 g / cm ³ , melt flow rate (MFR) = 11 g / 10 min. ) 100 parts by weight were sufficiently kneaded to prepare a resin composition.
Thereby, the stiffness, strength, abrasion resistance, etc. of the protective film itself are imparted.
(B). Resin composition constituting second layer As self-adhesive layer, styrene-ethylene-butylene-styrene copolymer (manufactured by JSR Corporation, trade name, Dynalon 1320P, PS content = 10%, density = 0.890 g / cm ^3. Melt index (MI) = 3.5 g / 10 min) 76.0 parts by weight and terpene resin (trade name, Clearon P-125, manufactured by Yashara Chemical Co., Ltd.) 24.0 parts by weight, and kneaded sufficiently A composition was prepared.
(C). Resin composition constituting the third layer Polylactic acid resin (trade name, Lacia H-100, manufactured by Mitsui Chemicals, density = 1.25 g / cm ³ , melt flow rate (MFR) as a separate substrate layer = 10 g / 10 min) 100 parts by weight were sufficiently kneaded to prepare a resin composition.
(2). Next, using the resin composition prepared above, using a three-type three-layer top-blown air-cooled inflation coextrusion film-forming machine, the layer of the resin composition of (A) is 45 μm, ( From the co-extruded inflation film having a total thickness of 70 μm of 3 types and 3 layers, co-extruded to a layer of 5 μm of the resin composition of (b) and 20 μm of the layer of the resin composition of (c) A self-adhesive laminate according to the present invention was produced.
The self-adhesive laminate produced above is not high in interlaminar strength between the second self-adhesive layer and the third separate base material layer and has an appropriate peel strength and appropriate adhesive strength. It was.

(1). First, the following resin compositions (a), (b), and (c) were prepared.
(I). Resin composition constituting first layer Polypropylene (trade name, Novatec FW4BT, density = 0.900 g / cm ³ , melt flow rate (MFR) = 6.5 g / 10 min as a base material layer ) 100 parts by weight were sufficiently kneaded to prepare a resin composition.
Thereby, the stiffness, strength, abrasion resistance, etc. of the protective film itself are imparted.
(B). Resin composition constituting second layer As self-adhesive layer, styrene-ethylene-butylene-styrene copolymer (manufactured by JSR Corporation, trade name, Dynalon 1320P, PS content = 10%, density = 0.890 g / cm ^3. Melt index (MI) = 3.5 g / 10 min) 76.0 parts by weight and terpene resin (trade name, Clearon P-125, manufactured by Yashara Chemical Co., Ltd.) 24.0 parts by weight, and kneaded sufficiently A composition was prepared.
(C). Resin composition constituting the third layer Polylactic acid resin (trade name, Lacia H-100, manufactured by Mitsui Chemicals, density = 1.25 g / cm ³ , melt flow rate (MFR) as a separate substrate layer = 10 g / 10 min) 100 parts by weight were sufficiently kneaded to prepare a resin composition.
(2). Next, using the resin composition prepared above, using a three-type three-layer top-blown air-cooled inflation coextrusion film-forming machine, the layer of the resin composition of (A) is 45 μm, ( From the co-extruded inflation film having a total thickness of 70 μm of 3 types and 3 layers, co-extruded to a layer of 5 μm of the resin composition of (b) and 20 μm of the layer of the resin composition of (c) A self-adhesive laminate according to the present invention was produced.
The self-adhesive laminate produced above is not high in interlaminar strength between the second self-adhesive layer and the third separate base material layer and has an appropriate peel strength and appropriate adhesive strength. It was.

(1). First, the following resin compositions (a), (b), and (c) were prepared.
(I). Resin composition constituting first layer As a base material layer, high-density polyethylene (trade name, Hi-Zex 3300F, density = 0.950 g / cm ³ , manufactured by Mitsui Chemicals, Inc., melt flow rate (MFR) = 1.1 g / 10 minutes) 100 parts by weight was sufficiently kneaded to prepare a resin composition.
Thereby, the stiffness, strength, abrasion resistance, etc. of the protective film itself are imparted.
(B). Resin composition constituting the second layer As a self-adhesive layer, a styrene-ethylene-butylene-styrene copolymer (manufactured by JSR Corporation, trade name, Dynalon 1320P, PS content = 15%, density = 0.890 g / cm ^3. Melt index (MI) = 3.5 g / 10 min) 76.0 parts by weight and terpene resin (trade name, Clearon P-125, manufactured by Yashara Chemical Co., Ltd.) 24.0 parts by weight, and kneaded sufficiently A composition was prepared.
(C). Resin composition constituting the third layer Polylactic acid resin (trade name, Lacia H-100, manufactured by Mitsui Chemicals, density = 1.25 g / cm ³ , melt flow rate (MFR) as a separate substrate layer = 10 g / 10 min) 100 parts by weight were sufficiently kneaded to prepare a resin composition.
(2). Next, using the resin composition prepared above, using a three-type three-layer top-blown air-cooled inflation coextrusion film-forming machine, the layer of the resin composition of (A) is 45 μm, ( From the co-extruded inflation film having a total thickness of 70 μm of 3 types and 3 layers, co-extruded to a layer of 5 μm of the resin composition of (b) and 20 μm of the layer of the resin composition of (c) A self-adhesive laminate according to the present invention was produced.
The self-adhesive laminate produced above is not high in interlaminar strength between the second self-adhesive layer and the third separate base material layer and has an appropriate peel strength and appropriate adhesive strength. It was.

(1). First, the following resin compositions (a), (b), and (c) were prepared.
(I). Resin composition constituting first layer As a base material layer, high-density polyethylene (manufactured by Nippon Polyethylene Co., Ltd., trade name, Novatec HJ580N, density = 0.960 g / cm ³ , melt flow rate (MFR) = 11 g / 10 min. ) 100 parts by weight were sufficiently kneaded to prepare a resin composition.
Thereby, the stiffness, strength, abrasion resistance, etc. of the protective film itself are imparted.
(B). Resin composition constituting the second layer As a self-adhesive layer, a styrene-ethylene-butylene-styrene copolymer (manufactured by JSR Corporation, trade name, Dynalon 1320P, PS content = 15%, density = 0.890 g / cm ^3. Melt index (MI) = 3.5 g / 10 min) 76.0 parts by weight and terpene resin (trade name, Clearon P-125, manufactured by Yashara Chemical Co., Ltd.) 24.0 parts by weight, and kneaded sufficiently A composition was prepared.
(C). Resin composition constituting the third layer Polylactic acid resin (trade name, Lacia H-100, manufactured by Mitsui Chemicals, density = 1.25 g / cm ³ , melt flow rate (MFR) as a separate substrate layer = 10 g / 10 min) 100 parts by weight were sufficiently kneaded to prepare a resin composition.
(2). Next, using the resin composition prepared above, using a three-type three-layer top-blown air-cooled inflation coextrusion film-forming machine, the layer of the resin composition of (A) is 45 μm, ( From the co-extruded inflation film having a total thickness of 70 μm of 3 types and 3 layers, co-extruded to a layer of 5 μm of the resin composition of (b) and 20 μm of the layer of the resin composition of (c) A self-adhesive laminate according to the present invention was produced.
The self-adhesive laminate produced above is not high in interlaminar strength between the second self-adhesive layer and the third separate base material layer and has an appropriate peel strength and appropriate adhesive strength. It was.

(1). First, the following resin compositions (a), (b), and (c) were prepared.
(I). Resin composition constituting first layer Polypropylene (trade name, Novatec FW4BT, density = 0.900 g / cm ³ , melt flow rate (MFR) = 6.5 g / 10 min as a base material layer ) 100 parts by weight were sufficiently kneaded to prepare a resin composition.
Thereby, the stiffness, strength, abrasion resistance, etc. of the protective film itself are imparted.
(B). Resin composition constituting the second layer As a self-adhesive layer, a styrene-ethylene-butylene-styrene copolymer (manufactured by JSR Corporation, trade name, Dynalon 1320P, PS content = 15%, density = 0.890 g / cm ^3. Melt index (MI) = 3.5 g / 10 min) 76.0 parts by weight and terpene resin (trade name, Clearon P-125, manufactured by Yashara Chemical Co., Ltd.) 24.0 parts by weight, and kneaded sufficiently A composition was prepared.
(C). Resin composition constituting the third layer Polylactic acid resin (trade name, Lacia H-100, manufactured by Mitsui Chemicals, density = 1.25 g / cm ³ , melt flow rate (MFR) as a separate substrate layer = 10 g / 10 min) 100 parts by weight were sufficiently kneaded to prepare a resin composition.
(2). Next, using the resin composition prepared above, using a three-type three-layer top-blown air-cooled inflation coextrusion film-forming machine, the layer of the resin composition of (A) is 45 μm, ( From the co-extruded inflation film having a total thickness of 70 μm of 3 types and 3 layers, co-extruded to a layer of 5 μm of the resin composition of (b) and 20 μm of the layer of the resin composition of (c) A self-adhesive laminate according to the present invention was produced.
The self-adhesive laminate produced above is not high in interlaminar strength between the second self-adhesive layer and the third separate base material layer and has an appropriate peel strength and appropriate adhesive strength. It was.

(1). First, the following resin compositions (a), (b), and (c) were prepared.
(I). Resin composition constituting first layer As a base material layer, high-density polyethylene (trade name, Hi-Zex 3300F, density = 0.950 g / cm ³ , manufactured by Mitsui Chemicals, Inc., melt flow rate (MFR) = 1.1 g / 10 minutes) 100 parts by weight was sufficiently kneaded to prepare a resin composition.
Thereby, the stiffness, strength, abrasion resistance, etc. of the protective film itself are imparted.
(B). Resin composition constituting the second layer As a self-adhesive layer, a blend obtained by adding 15% by weight of a random polypropylene resin to propylene-butene copolymer rubber (manufactured by Sumitomo Chemical Co., Ltd., trade name, Tough Selenium T3712, melting point = 135 ° C. , 76.0 parts by weight of melt index (MI) = 3.0 g / 10 min) and 24.0 parts by weight of terpene resin (trade name, Clearon P-125, manufactured by Yashara Chemical Co., Ltd.) are sufficiently kneaded to obtain a resin composition. A product was prepared.
(C). Resin composition constituting the third layer Polylactic acid resin (trade name, Lacia H-100, manufactured by Mitsui Chemicals, density = 1.25 g / cm ³ , melt flow rate (MFR) as a separate substrate layer = 10 g / 10 min) 100 parts by weight were sufficiently kneaded to prepare a resin composition.
(2). Next, using the resin composition prepared above, using a three-type three-layer top-blown air-cooled inflation coextrusion film-forming machine, the layer of the resin composition of (A) is 45 μm, ( From the co-extruded inflation film having a total thickness of 70 μm of 3 types and 3 layers, co-extruded to a layer of 5 μm of the resin composition of (b) and 20 μm of the layer of the resin composition of (c) A self-adhesive laminate according to the present invention was produced.
The self-adhesive laminate produced above is not high in interlaminar strength between the second self-adhesive layer and the third separate base material layer and has an appropriate peel strength and appropriate adhesive strength. It was.

(1). First, the following resin compositions (a), (b), and (c) were prepared.
(I). Resin composition constituting first layer As a base material layer, high-density polyethylene (manufactured by Nippon Polyethylene Co., Ltd., trade name, Novatec HJ580N, density = 0.960 g / cm ³ , melt flow rate (MFR) = 11 g / 10 min. ) 100 parts by weight were sufficiently kneaded to prepare a resin composition.
Thereby, the stiffness, strength, abrasion resistance, etc. of the protective film itself are imparted.
(B). Resin composition constituting the second layer As a self-adhesive layer, a blend obtained by adding 15% by weight of a random polypropylene resin to propylene-butene copolymer rubber (manufactured by Sumitomo Chemical Co., Ltd., trade name, Tough Selenium T3712, melting point = 135 ° C. , 76.0 parts by weight of melt index (MI) = 3.0 g / 10 min) and 24.0 parts by weight of terpene resin (trade name, Clearon P-125, manufactured by Yashara Chemical Co., Ltd.) are sufficiently kneaded to obtain a resin composition. A product was prepared.
(C). Resin composition constituting the third layer Polylactic acid resin (trade name, Lacia H-100, manufactured by Mitsui Chemicals, density = 1.25 g / cm ³ , melt flow rate (MFR) as a separate substrate layer = 10 g / 10 min) 100 parts by weight were sufficiently kneaded to prepare a resin composition.
(2). Next, using the resin composition prepared above, using a three-type three-layer top-blown air-cooled inflation coextrusion film-forming machine, the layer of the resin composition of (A) is 45 μm, ( From the co-extruded inflation film having a total thickness of 70 μm of 3 types and 3 layers, co-extruded to a layer of 5 μm of the resin composition of (b) and 20 μm of the layer of the resin composition of (c) A self-adhesive laminate according to the present invention was produced.
The self-adhesive laminate produced above is not high in interlaminar strength between the second self-adhesive layer and the third separate base material layer and has an appropriate peel strength and appropriate adhesive strength. It was.

(1). First, the following resin compositions (a), (b), and (c) were prepared.
(I). Resin composition constituting first layer Polypropylene (trade name, Novatec FW4BT, density = 0.900 g / cm ³ , melt flow rate (MFR) = 6.5 g / 10 min as a base material layer ) 100 parts by weight were sufficiently kneaded to prepare a resin composition.
Thereby, the stiffness, strength, abrasion resistance, etc. of the protective film itself are imparted.
(B). Resin composition constituting the second layer As a self-adhesive layer, a blend obtained by adding 15% by weight of a random polypropylene resin to propylene-butene copolymer rubber (manufactured by Sumitomo Chemical Co., Ltd., trade name, Tough Selenium T3712, melting point = 135 ° C. , 76.0 parts by weight of melt index (MI) = 3.0 g / 10 min) and 24.0 parts by weight of terpene resin (trade name, Clearon P-125, manufactured by Yashara Chemical Co., Ltd.) are sufficiently kneaded to obtain a resin composition. A product was prepared.
(C). Resin composition constituting the third layer Polylactic acid resin (trade name, Lacia H-100, manufactured by Mitsui Chemicals, density = 1.25 g / cm ³ , melt flow rate (MFR) as a separate substrate layer = 10 g / 10 min) 100 parts by weight were sufficiently kneaded to prepare a resin composition.
(2). Next, using the resin composition prepared above, using a three-type three-layer top-blown air-cooled inflation coextrusion film-forming machine, the layer of the resin composition of (A) is 45 μm, ( From the co-extruded inflation film having a total thickness of 70 μm of 3 types and 3 layers, co-extruded to a layer of 5 μm of the resin composition of (b) and 20 μm of the layer of the resin composition of (c) A self-adhesive laminate according to the present invention was produced.
The self-adhesive laminate produced above is not high in interlaminar strength between the second self-adhesive layer and the third separate base material layer and has an appropriate peel strength and appropriate adhesive strength. It was.

The self-adhesive laminate according to the present invention functions as a surface protective film that protects the surface of various articles, does not show any air accumulation between the layers, adheres extremely well, and peels off. At that time, the peel strength is stable, the degree of cleanliness of the peeled surface is sufficiently maintained, no adhesive remains, the influence on the resource depletion problem is minimized, and the load on the environment is reduced. The present invention relates to a very useful self-adhesive laminate having a structure for reducing the above.
Furthermore, the self-adhesive laminate according to the present invention has a separate base material layer that is biodegradable and is decomposed by microorganisms or the like even when discarded in the natural environment, thereby preserving the natural environment. To get.

It is a schematic sectional drawing which shows the layer structure of the example about the self-adhesive laminated body which concerns on this invention. It is a schematic sectional drawing which shows the example about the structure as a surface protection film which uses the self-adhesive laminated body which concerns on this invention shown in FIG. 1, and protects the surface of various articles | goods. It is a schematic sectional drawing which shows the example about the structure as a surface protection film which uses the self-adhesive laminated body which concerns on this invention shown in FIG. 1, and protects the surface of various articles | goods.

Explanation of symbols

A Self-adhesive laminate B Surface protective film 1 Substrate layer 1a Resin layer 2 Self-adhesive layer 2a Resin layer 3 Separate substrate layer 3a Resin layer 4 Three-layer coextrusion laminate film 4a Three-layer coextrusion laminate film 11 Goods

Claims (6)

At least a base layer, a self-adhesive layer, and a separate base layer comprising a co-extruded laminated film, and the base layer is a resin layer made of a resin composition containing a polyolefin resin as a main component. And the self-adhesive layer is composed of a resin layer made of a resin composition containing a self-adhesive resin as a main component, and the separate substrate layer is made of a polylactic acid resin as a main component. A self-adhesive laminate comprising a resin layer made of a resin composition and comprising a coextruded laminate film of the three resin layers. The self-adhesive laminate according to claim 1, wherein the polyolefin resin constituting the base material layer comprises a high-density polyethylene resin or a polypropylene resin. The self-adhesive resin constituting the self-adhesive layer is a mixture of an ethylene-vinyl acetate copolymer and a terpene resin, a mixture of a polypropylene rubber and a terpene resin, or a thermoplastic elastomer and a terpene resin. It consists of a mixture, The self-adhesive laminated body as described in any one of said Claims 1-2 characterized by the above-mentioned. The self-adhesive laminate according to any one of claims 1 to 3, wherein the base material layer has a thickness of 20 µm to 100 µm. The self-adhesive layered product according to any one of claims 1 to 4, wherein the self-adhesive layer has a thickness of 5 to 30 µm. The self-adhesive laminate according to any one of claims 1 to 5, wherein the separate substrate layer has a thickness of 5 to 50 µm.

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