JP2003342539A - Retroreflective adhesive sheet - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a retroreflective adhesive sheet having high tensile strength and easily tearable straight by hand. <P>SOLUTION: The retroreflective adhesive sheet is obtained by laminating a retroreflective sheet on one side and providing an adhesive layer on the other side of a cloth-like form made by crossing tape-like filaments obtained by uniaxially orienting a thermoplastic resin. In the cloth-like form, the fineness of the warps is 50-250 dtex, that of the wefts being 200-400 dtex, the warps being lower in fineness than the wefts, and the density of the warps being greater than that of the wefts. <P>COPYRIGHT: (C)2004,JPO

Description

Detailed Description of the Invention

[0001]

TECHNICAL FIELD The present invention relates to a retroreflective adhesive sheet. More specifically, the present invention relates to a retroreflective pressure-sensitive adhesive sheet suitable for use as a sign when used in hats, boots, roads, construction sites, etc.

[0002]

2. Description of the Related Art In recent years, a retroreflective sheet that shines brightly when irradiated with light has been widely used as a warning or a sign for workers' hats, boots, roads, construction sites, etc.

As these retroreflective sheets, those having a structure in which glass globules are joined in parallel to the surface of a thermoplastic resin film or the like are used.

It is important that the retroreflective sheet can be appropriately used outdoors according to the object, and it is important that it can be cut easily, and it is necessary that it can be cut freely without using a special tool. Becomes

However, since the thermoplastic synthetic resin is flexible and flexible, it expands when a tensile force is applied.
The stress does not concentrate and it is difficult to make a rupture start point, and even if a rupture start point is created, the cutting line bends when the cutting is advanced, it does not advance linearly, and it tears linearly even if a pressing material is used. There is a problem that you can not. For this reason, it is necessary to cut with scissors, a cutter, etc., and there is a problem that the efficiency of the sticking work is not improved.

Therefore, there is a demand for the development of a retroreflective pressure-sensitive adhesive sheet which is excellent in hand-cutting property, can be easily cut linearly by hand, and has excellent tensile strength.

[0007]

DISCLOSURE OF THE INVENTION The present invention provides a retroreflective pressure-sensitive adhesive sheet which is excellent in tensile strength, has good hand-cutting properties, and can be easily cut linearly by hand.

[0008]

Means for Solving the Problems The present invention has been made as a result of extensive studies to solve the above problems. Specifically, a tape-shaped linear member obtained by uniaxially stretching a thermoplastic resin. In a retroreflective pressure-sensitive adhesive sheet obtained by laminating a retroreflective sheet on one side of a cloth-like body formed by intersecting with each other, and forming an adhesive layer on the other side, the fineness of the warp of the cloth-like body is 50 to 250.
The decitex and weft fineness is in the range of 200 to 400 decitex, the warp fineness is lower than the weft fineness, and
The present invention provides a retroreflective pressure-sensitive adhesive sheet, characterized in that the retroreflective pressure-sensitive adhesive sheet is composed of a cloth-like body in which the number of warp threads is greater than that of weft threads.

The present invention also provides a retroreflective pressure-sensitive adhesive sheet as described above, wherein the tape-shaped filaments are made of polyolefin, and the tape-shaped filaments are made of a polyolefin-based polymer on one or both sides of a base layer made of a polyolefin-based polymer. The above-mentioned retroreflective pressure-sensitive adhesive sheet obtained by laminating a joining layer made of a polyolefin polymer having a low melting point, and the above-mentioned retroreflective pressure-sensitive adhesive sheet obtained by weaving a tape-shaped filamentous body into a cloth-like body. , And a cross-bonded cloth obtained by arranging tape-shaped filaments in parallel in one direction, arranging the tape-shaped filaments so as to intersect with other tape-shaped filaments, and coupling the intersections. The above-mentioned retroreflective pressure-sensitive adhesive sheet is provided.

Furthermore, the present invention provides the above-mentioned retroreflective pressure-sensitive adhesive sheet having a pressure-sensitive adhesive layer formed on one surface of a cloth-like body via a polyolefin layer, and a polyolefin layer laminated on both surfaces of the cloth-like body. The above-mentioned retroreflective pressure-sensitive adhesive sheet in which a retroreflective sheet and a pressure-sensitive adhesive layer are respectively formed on a layer, the above-mentioned retroreflective pressure-sensitive adhesive sheet in which a release agent is applied to the upper surface of the retroreflective sheet, and a pressure-sensitive adhesive layer. The above-mentioned retroreflective pressure-sensitive adhesive sheet having a release paper attached to the upper surface of the above.

[0011]

BEST MODE FOR CARRYING OUT THE INVENTION The retroreflective pressure sensitive adhesive sheet 1 of the present invention comprises:
As shown in FIG. 1, a retroreflective sheet 5 is laminated on one side of a cloth-like body 3 formed by intersecting a tape-shaped linear body 2 obtained by uniaxially stretching a thermoplastic resin, and is adhered to the other side. The agent layer 6 is formed.

In the present invention, the cloth-like body 3 is a generic term for a flexible sheet-like body composed of the tape-shaped filaments 2, and is a uniaxially-stretched tape-like tape, yarn, split yarn or the like. A plain weave, a twill weave, or a number of tape-shaped filaments 2 are arranged side by side in one direction using the filaments 2.
A large number of tape-shaped filaments 2 can be arranged side by side in the direction orthogonal to each other, and can be used as a cross-connecting cloth (sof) in which the intersections are joined.

The tape-shaped linear member 2 may be a single layer of crystalline resin, as shown in FIG.
The bonding layer 9 may be laminated on one surface of the base layer 8 as shown in FIG. 4B, and the bonding layer 9 may be formed on both surfaces of the base layer 8 as shown in FIG. 4C. It may be laminated.

As the synthetic resin forming the base layer 8 of the tape-shaped linear member 2 or the laminated member, a resin having a large stretching effect, generally a crystalline resin, is used. Polyethylene, polypropylene, ethylene
Propylene block copolymers, polyolefins such as linear low density polyethylene, polyesters such as polyethylene terephthalate and polybutylene terephthalate, polyamides such as nylon 6 and nylon 66, and the like can be used.

Among them, polyolefins such as high-density polyethylene, linear low-density polyethylene, polypropylene and the like are preferable in terms of processability and economy. Especially high density polyethylene,
Linear low density polyethylene is desirable, and as the high density polyethylene, those having a density of 0.930 to 0.970, preferably 0.940 to 0.960 are used.

The bonding layer 9 is for bonding the tape-shaped filaments 2 to each other after the tape-shaped filaments 2 are made into a cloth shape, or bonding the cloth-shaped elements 3 and the retroreflective sheet 5 together. , A synthetic resin having a lower melting point than that of the synthetic resin forming the base layer 8 and excellent heat fusion property is used.

Specifically, low-density polyethylene, linear low-density polyethylene, high-density polyethylene, polypropylene, polyolefin such as ethylene / propylene block copolymer, polyester such as polyethylene terephthalate and polybutylene terephthalate, nylon 6, nylon 66. Polyamide or the like can be used, and a synthetic resin having a lower melting point than that of the base layer is selected in relation to the synthetic resin of the base layer.

It is also a desirable method to introduce a unit derived from a polar monomer by adding a modified polyolefin obtained by modifying a polyolefin with a polar monomer alone or by blending it with a base polyolefin.

Furthermore, an inorganic filler can be added to the thermoplastic resin forming the cloth-like body 3. As the type of inorganic filler, it is possible to use an inorganic filler known per se as a synthetic resin additive, for example, talc, clay, mica, calcium carbonate, barium sulfate, wollastonite, zeolite, aluminum hydroxide, Magnesium hydroxide, calcium silicate, etc. can be used. It is desirable to add the inorganic filler together with the acid-modified polyolefin.

The flame retardancy and the hand-cutting property can be improved by blending the inorganic filler, and the blending amount of the inorganic filler is 3 to 60% by weight, preferably 5 to 40% by weight.

Various additives can be added to the synthetic resin used as the base layer 8 or the bonding layer 9 depending on the purpose.

Specifically, antioxidants such as phenol-based and organic phosphite-based organic phosphorus-based antioxidants and thioether-based antioxidants; hindered amine-based light stabilizers; benzophenone-based, benzotriazole-based, benzoate-based ultraviolet absorbers, etc. Agents; nonionic, cationic, anionic, etc. antistatic agents; bisamide, wax, organometallic salt, etc. dispersants; amide, wax, organometallic salt, ester, etc. lubricants, bromine-containing Organic type, melamine type, phosphoric acid type,
Flame retardants such as phosphate ester type, antimony trioxide, magnesium hydroxide, red phosphorus, etc .; organic pigments; inorganic pigments; inorganic fillers, organic fillers; metal ion type inorganic and organic antibacterial agents.

These additives are appropriately combined and compounded in any step of manufacturing the material composition of the base layer 8 and the bonding layer 9. Blending of the additives, conventionally known twin-screw extruder, Banbury mixer, kneader, using a kneading device such as a mixing roll at a predetermined ratio, may be prepared by melt kneading, A so-called masterbatch having a high concentration may be prepared, and this may be diluted before use.

When a laminated body is used as the tape-shaped linear member 2, as a means for molding a laminated film which is a molding material thereof, a film which becomes the base layer 8 and a film which becomes the bonding layer 9 are previously formed and dried. Means for forming a multilayer using a laminating method or a thermal laminating method, a method of coating the surface of the base layer 8 with a synthetic resin to be the bonding layer 9, and extruding the bonding layer 9 onto a preformed base layer 8 film. It may be appropriately selected and used from known means such as a laminating method or extrusion molding as a laminated film by a multi-layer coextrusion method. However, the ease and cost of molding, and the adhesiveness and optical property between each layer of the product. From the viewpoint of transparency, a method of obtaining a laminate of the base layer 8 and the bonding layer 9 in one step by a multi-layer coextrusion method is desirable.

As means for stretching to form the tape-shaped filamentous body 2, after the film to be the base layer 8 is uniaxially stretched, a synthetic resin to be the bonding layer 9 is laminated, and this is slit into a tape shape. Alternatively, the base layer 8 and the bonding layer 9 may be used.
Before slitting a laminated film in which and are laminated, or
It can also be obtained by uniaxially stretching after slitting.

As the stretching method, stretching with a hot roll,
It can be carried out by a method using a hot plate, a method using a roll in a hot air oven, or the like.

The draw ratio is 3 to 12 times, preferably 5 to 5.
About 10 times is appropriate, and for the tape-shaped linear member 2,
The fineness of the warp is 50 to 250 decitex, preferably 8
0-200 decitex, weft is 200-400 decitex, preferably 230-360 decitex. Thread width 0.4-5.0 mm, preferably 0.6-
It is set to 3.5 mm.

The tape-shaped filament (flat yarn) thus obtained can be made into a split yarn by making many small cuts in the longitudinal direction. By using split yarn, the texture and suppleness can be improved.

As shown in FIG. 2, the tape-shaped filament 2 obtained is a plain weave, or a twill weave, a twill weave, a ridge weave, a double weave, or the like, or as shown in FIG. As described above, a large number of tape-shaped filaments 2b are arranged in parallel, and the tape-shaped filaments 2a are arranged side by side so as to intersect with each other, and the intersections are connected to each other to be used as the cloth-like body 3 which is a cross-bonded cloth. You can In this case, the number of warp threads to be driven is larger than that of the weft threads.

A retroreflective sheet 5 is provided on one surface of the cloth-like body 3.
Is laminated, and the adhesive layer 6 is formed on the other surface. The polyolefin layer 7a is laminated on one surface of the cloth-like body 3,
It is desirable to laminate the retroreflective sheet 5 via the polyolefin layer 7a, and also to laminate the polyolefin layer 7b on the other surface of the cloth-like body 3 to form the adhesive layer 6 via the polyolefin layer 7b. Is desirable.

As the polyolefin layers 7a and 7b to be laminated, general polyolefins can be widely used. High-pressure process low-density polyethylene, linear low-density polyethylene, high-density polyethylene, ethylene-propylene copolymer, ethylene A vinyl acetate copolymer or the like can be used. In particular, high-pressure low-density polyethylene or linear low-density polyethylene produced by using a metallocene catalyst is preferable. The hand tearability can be improved by forming a layer of polyolefin.

Further, these polyolefin layers 7a, 7b
An acid-modified polyolefin and an inorganic filler can be added to the composition, and additives such as an antioxidant, a light stabilizer, an ultraviolet absorber, a lubricant, a flame retardant, and a pigment can be added.

Polyolefin layer 7 laminated on the cloth 3
At least one of a and 7b is preferably melt-kneaded and formed into a film shape by laminating a melted film on the cloth body 3 in advance. In this case, the temperature of the melted film to be laminated is controlled by the cloth body 3. The temperature is preferably 130 to 220 ° C. higher than the melting point of the resin constituting the.
By laminating at a high temperature, the polyolefin penetrates into the cloth-like body 3 to fix the cloth-like body structure,
The hand-cutting property can be improved. The thickness of the polyolefin layer 7 laminated on the cloth 3 is 10 to 60 μm, preferably 15 to 40 μm.

In the present invention, the retroreflective sheet 5 is not particularly limited, and those generally used as this type of retroreflective sheet can be used. A retroreflective sheet in which spheres are attached so as to be arranged in a single layer, or a cube-corner type retroreflective sheet in which triangular pyramid small particles are attached can be used, and transparent small spheres are embedded in a transparent resin. It may be either a closed type provided as described above or an open type in which a part of the small sphere is exposed on the surface.

Taking the open type using small spheres as an example, as shown in FIG. 5, a reflecting layer 12 is provided behind the reflecting small spheres 11 by metal vapor deposition, and a part of the reflecting small spheres 11 is buried. The bonding resin layer 13 so that
Hold in.

Here, the reflective small spheres 11 have an average particle diameter of 50.
The thickness is 0 μm or less, preferably 30 to 200 μm. As the material of the reflective sphere 11, any material having high transparency can be widely used, and an acrylic resin, a polyurethane resin, a polyester resin, an epoxy resin, a polyamide resin, or the like can be used. Generally, glass is used.

The reflective layer 12 provided on the back surface of the reflective globule 11 of the present invention is formed by depositing, sputtering or plating a metal thin film of aluminum, gold, silver, tin, nickel or the like. In particular, an aluminum thin film that is inexpensive and has a high light reflectance is preferably used.

As the bonding resin layer 13, for example, acrylic resin, polyurethane resin, polyester resin,
Various synthetic resins such as epoxy resin, nylon resin, rubber resin and vinyl resin can be used. In particular, a polyester resin, a polyurethane resin, or a mixture thereof is preferable because it has strong adhesiveness to the metal thin film that is the reflective layer 12, is flexible, and has high durability against friction and bending during use.

It is also preferable that the bonding resin layer 13 is blended with an appropriate amount of a polyisocyanate crosslinking agent, an epoxy crosslinking agent, a melamine crosslinking agent or the like in order to improve physical durability, and the fixing resin is crosslinked and solidified. Used. Further, it is also a preferable method to appropriately add an inorganic filler such as a silane coupling agent, titanium oxide, carbon black, aluminum powder and silica powder as a reinforcing material to the fixing resin to improve durability. In particular, the silane coupling agent is preferable because it improves the adhesion to the metal thin film that is the reflective layer, and thus improves the physical durability of the reflective material.

The open type retroreflective sheet 5 used in the present invention is manufactured, for example, by the following method. A resin layer for temporary embedding of reflective small spheres having a low softening point such as polyethylene film is laminated on a film base material such as polyethylene terephthalate film to prepare a temporary embedding support. The support for temporary embedding is heated at a temperature equal to or higher than the softening point of the resin for temporary embedding of the reflective small spheres, and the reflective small spheres are sprinkled over the single layer over the soft sphere, and 20 to 60% of the diameter of the reflective small spheres is dispersed. The reflective small spheres are embedded in the temporary embedding resin layer. A reflective layer 12 is formed on the exposed surface of the reflective small spheres 11 of the support for temporarily embedding the reflective small spheres thus formed by metal deposition or the like, and a bonding resin layer 13 having a predetermined thickness is further formed thereon. To stack.

Next, the temporary embedding support, in which the reflecting small spheres 11 are temporarily buried, is peeled off to obtain an open type retroreflective sheet 5 in which a part of the reflecting small spheres are exposed in the air. Then, a solution of a transparent resin having a low viscosity is coated on the surface side of the reflective small spheres of this retroreflective sheet,
The transparent resin layer 16 is formed by drying, and the retroreflective sheet 5 used in the present invention can be obtained.

As the pressure-sensitive adhesive used in the pressure-sensitive adhesive layer 6 of the present invention, those generally used as pressure-sensitive adhesives for pressure-sensitive adhesive tapes can be used. For example, acrylic resin-based pressure-sensitive adhesives, natural rubber and synthetics. Rubber-based adhesives such as rubber, styrene-butadiene-styrene block copolymers, styrene-isoprene-styrene block copolymers and block copolymer-based adhesives such as hydrogenated products thereof, ethylene-vinyl acetate copolymer-based adhesives Examples thereof include polyvinyl ether resin-based adhesives, silicone resin-based adhesives, and the like. Among them, acrylic resin-based adhesives having excellent durability and weather resistance and little stains during handling are preferable. These adhesives may be used alone or in combination of two or more.

The form of these pressure sensitive adhesives is not particularly limited, and examples thereof include solvent type pressure sensitive adhesives, emulsion type pressure sensitive adhesives, hot melt type pressure sensitive adhesives, reactive pressure sensitive adhesives, and photopolymerizable monomer type pressure sensitive adhesives. Etc. may be used.

If necessary, these pressure-sensitive adhesives may include a cross-linking agent such as a polyisocyanate compound, an aziridine compound, a metal chelate compound, a tackifier, or a cup, as long as they do not hinder the present invention. Ring agent, filler, softening agent, plasticizer, surfactant, antioxidant (aging inhibitor), heat stabilizer, light stabilizer, ultraviolet absorber, colorant, defoaming agent, flame retardant, antistatic agent One kind or two or more kinds of various additives such as the above may be added.

The pressure-sensitive adhesive layer 6 formed on the pressure-sensitive adhesive tape 1 is not particularly limited, but its thickness is 10
It is preferable that it is μm to 0.5 mm. If the thickness of the pressure-sensitive adhesive layer is less than 10 μm, the adhesiveness to the rough surface of the pressure-sensitive adhesive tape 1 and the conformability to unevenness may be insufficient, and conversely, if the thickness of the pressure-sensitive adhesive layer 6 exceeds 0.5 mm, the pressure-sensitive adhesive layer may have a tackiness. The cost may increase although the property and the adhesive strength are not improved any more.

The acrylic resin adhesive will be described in more detail. As the acrylic resin adhesive, an acrylic resin adhesive obtained by polymerizing a carboxyl group-containing monomer or a (meth) acrylic acid alkyl ester monomer is used. A polymer is used.

The alkyl group preferably has about 4 to 12 carbon atoms, specifically, n-butyl (meth) acrylate,
Examples include isobutyl (meth) acrylate, n-octyl (meth) acrylate, isooctyl (meth) acrylate, 2-ethylhexyl (meth) acrylate, isononyl (meth) acrylate, and particularly n.
-Butyl acrylate and 2-ethylhexyl acrylate are preferred.

Examples of the carboxyl group-containing monomer include monocarboxylic acids such as acrylic acid, methacrylic acid, crotonic acid and itaconic acid; dicarboxylic acids such as fumaric acid and maleic acid; and monoesters thereof. Of these carboxyl group-containing radically polymerizable monomers, acrylic acid and methacrylic acid are preferably used. The carboxyl group-containing polymerizable monomer is preferably about 3 to 20% by weight based on the whole monomer.

The acrylic resin-based pressure-sensitive adhesive used in the present invention may be copolymerized with a small amount of a modifying component monomer for the purpose of adjusting the glass transition temperature, polarity and the like. Examples of such a monomer include methyl (meth) acrylate, ethyl (meth) acrylate, acrylamide, vinyl acetate,
Examples thereof include styrene, acrylonitrile, vinylpyrrolidone and the like.

As the acrylic polymer, a polyfunctional compound having two or more functional groups capable of reacting with a carboxyl group in the molecule, or a polyfunctional compound and a monofunctional compound having one functional group in the molecule are used. It can be blended. Examples of this type of functional group-containing compound include isocyanate group-containing compounds, epoxy groups (or glycidyl groups)
Examples thereof include a compound containing a compound, an aziridinyl group-containing compound, a metal complex, a melamine compound and the like.

Further, it is particularly effective to add a small amount of plasticizer to the adhesive composition. The type of plasticizer to be blended is not limited, and examples thereof include low molecular weight plasticizers such as esters of aliphatic polyvalent carboxylic acids, esters of aromatic polyvalent carboxylic acids and phosphoric acid esters, and high molecular weight plasticizers such as polyester Although molecular plasticizers and the like can be exemplified, esters of aliphatic dibasic acids are particularly effective, and adipic acid diester is most preferable. The blending amount is preferably 0.05 to 4% by weight.

It is desirable to add a benzotriazole compound to the adhesive. Benzotriazole-based compounds are known to have a function of preventing metal corrosion, and by blending them, discoloration due to metal corrosion can be more effectively prevented. The benzotriazole-based compound may be added in an effective amount, and is approximately 0.01 to 5% by weight.
The degree is desirable.

The coated surface on which the adhesive layer 6 is coated has
If necessary, in order to enhance the adhesion with the adhesive, the surface thereof may be subjected to physical treatment such as sandblasting or flame treatment, chemical treatment such as corona treatment or plasma treatment, or primer treatment. .

The pressure-sensitive adhesive is usually dissolved and dispersed in an appropriate medium, and then coated on a substrate and dried to form the pressure-sensitive adhesive layer 6, or a step of releasing treatment. After being coated on paper, it is dried and transferred onto a support to form an adhesive layer 6
The retroreflective pressure-sensitive adhesive sheet 1 is laminated. The coating means and the drying method are not limited, and known ones can be adopted.

The back surface of the retroreflective sheet 5, that is,
On the surface opposite to the surface on which the pressure-sensitive adhesive layer 6 is laminated, which comes into contact with the surface of the pressure-sensitive adhesive layer 6 when wound into a roll, a peeling force (also referred to as a spreading force) at the time of rewinding is provided. In order to reduce the weight, a release treatment can be applied. Further, a release paper that has been subjected to a release treatment can be attached on the pressure-sensitive adhesive layer 6. Examples of the releasing treatment include coating with a silicone-based releasing agent, a fluorine-based releasing agent, and a long-chain alkyl graft polymer-based releasing agent, which are accompanied by a curing reaction as necessary.

[0056]

Since the retroreflective pressure-sensitive adhesive sheet of the present invention has such a constitution, it can be easily attached to a wall body and the like.
A retroreflective pressure-sensitive adhesive sheet having excellent tensile strength and durability can be obtained. Further, it has good tearability and hand tearability, and can be easily torn linearly, so that the efficiency of the sticking work can be improved.

[0057]

[Example] (Evaluation method) Tensile strength and tensile elongation JIS Z-9117 Tensile speed 300 mm / min,
25 mm width, 300 mm between chucks 2. Tear strength JIS L-1096 A-1 method (single tongue method), tear speed 600 mm / min, chuck space 200
mm 3. Hand tearability A test piece having a width of 25 mm and a length of 200 mm was cut in the longitudinal direction, and the tearing direction when tearing by hand was visually observed.

(Example 1) Production of cloth-like material High-density polyethylene (HY-433 manufactured by Japan Polychem,
A film having a density of 0.956 and MFR 0.55) was formed by an inflation molding method, and the obtained film was slit using a leather. Then, the temperature 110-12
After drawing 7 times on a hot plate at 0 ° C, 6% relaxation heat treatment was performed in a hot air circulation type oven at a temperature of 120 ° C, a yarn width of 0.85 mm, a warp yarn having a fineness of 115 decitex and a yarn width of 1.2 mm, A weft having a fineness of 310 decitex was produced.

Using the water jet machine, the obtained warp and weft yarns were 29 warps / 25.4 mm and 16 wefts / 2.
A plain-woven fabric having a weight of 5.4 mm and a basis weight of 33 g / m ² was obtained.

Low density polyethylene (LC-720 manufactured by Nippon Polychem Co., Ltd.) was extruded and laminated on one side of the woven cloth (laminate layer thickness 20 μm), and the surface was subjected to corona discharge treatment to obtain a wet tension of 420 μN / cm.

Laminated retroreflective sheeting A polyurethane-based anchor coating agent was applied to the bonding resin layer side of a retroreflective sheeting (EG manufactured by Nippon Carbide Co., Ltd.),
After drying, low-density polyethylene (LC-made by Nippon Polychem)
720) was melt-extruded at 280 ° C. from a T-die into a film having a thickness of 30 μm and laminated on the woven fabric side of the above-mentioned one-sided polyethylene layer-coated woven fabric to obtain a retroreflective sheet / woven fabric composite sheet.

Formation of adhesive layer Acrylic acid-n was formed on the corona discharge treated surface of the above composite sheet.
-Copolymer mainly composed of butyl and 2-ethylhexyl acrylate (Nippon Gosei Kagaku Co., Ltd., Coponile NK-6
31) Acrylic adhesive containing 100 parts by weight of a metal chelate-based curing agent as a cross-linking agent, 0.2 parts by weight of a toluene solution of aluminium acetylacetonate (Nippon Gosei Kagaku Co., Ltd., Coponile N-5792) based on the solid content. The agent was applied so that the application thickness (based on solid content) was 40 μm. The evaluation results are shown in Table 1.

(Comparative Example 1) An acrylic pressure-sensitive adhesive was applied to the bonding resin layer side of the retroreflective sheeting. The evaluation results are shown in Table 1.

[0064]

[Table 1]

[Brief description of drawings]

FIG. 1 is a vertical sectional view showing an example of a retroreflective pressure-sensitive adhesive sheet of the present invention.

FIG. 2A is a plan view showing an example of a cloth-like body, and FIG.

FIG. 3 is a vertical sectional view showing another example of the cloth-like body.

FIG. 4 is a vertical cross-sectional view showing an example of a tape-shaped linear member.

FIG. 5 is a vertical sectional view showing an example of a retroreflective sheet.

[Explanation of symbols]

1: Retroreflective adhesive sheet 2: Tape-shaped filament 3: cloth-like body 5: Retroreflective sheet 6: Adhesive layer 7: Polyolefin layer 8: Base layer 9: Bonding layer 11: Reflective sphere 12: reflective layer 13: Bonding resin layer 16: Transparent resin layer

Claims (9)

[Claims] 1. A retroreflective sheet is laminated on one side of a cloth-like body formed by intersecting tape-shaped filaments obtained by uniaxially stretching a thermoplastic resin, and an adhesive layer is formed on the other side. In the retroreflective pressure sensitive adhesive sheet, the fineness of the warp of the cloth-like body is 50 to
250 decitex, weft fineness in the range of 200 to 400 decitex, warp fineness lower than weft fineness,
A retroreflective pressure-sensitive adhesive sheet, characterized in that it comprises a cloth-like body having a greater number of warp threads than the weft threads. 2. The retroreflective pressure-sensitive adhesive sheet according to claim 1, wherein the tape-shaped linear member is made of polyolefin. 3. The tape-shaped linear member comprises a base layer made of a polyolefin-based polymer, and a bonding layer made of a polyolefin-based polymer having a melting point lower than that of the base-layer polyolefin-based polymer is laminated on one or both sides of the base layer. Alternatively, the retroreflective pressure-sensitive adhesive sheet according to item 2. 4. The retroreflective pressure-sensitive adhesive sheet according to claim 1, wherein the cloth-like body is obtained by weaving a tape-like linear body. 5. A cloth-like body is obtained by arranging tape-shaped filaments in parallel in one direction, arranging them so that other tape-shaped filaments intersect each other, and connecting the intersections. The retroreflective pressure-sensitive adhesive sheet according to claim 1, which is a cross-bonded cloth. 6. The retroreflective pressure-sensitive adhesive sheet according to claim 1, wherein a pressure-sensitive adhesive layer is formed on one surface of the cloth-like body with a polyolefin layer interposed therebetween. 7. The retroreflective pressure-sensitive adhesive according to claim 1, wherein a polyolefin layer is laminated on both surfaces of the cloth-like body, and a retroreflective sheet and an adhesive layer are formed on each polyolefin layer. Sheet. 8. The retroreflective pressure-sensitive adhesive sheet according to claim 1, wherein a release agent is applied to the upper surface of the retroreflective sheet. 9. The retroreflective pressure-sensitive adhesive sheet according to claim 1, wherein a release paper is attached to the upper surface of the pressure-sensitive adhesive layer.