JPH10165862A - Masking film for antistatic coating - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a film which hardly generates static electricity by sticking a tacky adhesive tape in the longitudinal direction at the end edge of the inside surface of a flat film exposed toward the longitudinal direction of the film provided with a score in such a manner that its tacky adhesive layer partly overlaps and rolling the stuck film. SOLUTION: The. score is cut longitudinally at one point of the flat film 2 and the film side on the upper side of the flat film 2 existing leftward is turned 180 deg. from the score with the longitudinal direction at the left end of the flat film 2 as the axis of rotation to expose the inside surface of the film piece. The tacky adhesive tape 3 of 15mm width is stuck along the longitudinal direction of the flat film 2 on the width 5mm at the left end of the exposed inside surface of the film piece in such a manner that the tacky adhesive layer (c) partly faces the inside surface of the exposed flat film 2. The stuck flat film 2 is rolled. As a result, the problems occurring in the static electricity are eliminated and the masking film 1 having the excellent workability is produced.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a masking film for antistatic coating. More specifically, the present invention relates to a masking film for antistatic coating and a method for producing the same, and a tubular film for producing the masking film. The masking film for antistatic coating of the present invention is a building, a road, an airfield, a playground, a floor, a wall, an automobile, a ship, an airplane, a vehicle, a machine, an office article, a sports article, an amusement article, a leisure article, various displays, Widely used for painting toys, woodwork, household goods, etc.

[0002]

2. Description of the Related Art Various buildings, roads, athletic fields, parking lots, automobiles, vehicles, various articles, and the like are coated with various paints for giving aesthetic appearance and displaying marks, rules, and descriptions. In this case, to easily separate the painted and unpainted parts, the unpainted parts are covered with paper, synthetic paper, non-woven fabric, plastic film, etc., and the paint directly adheres to the surface or the paint moves from the painted parts Even if it adheres, it does not come into direct contact with the non-painted part, but receives it on the surface of paper, synthetic paper, non-woven fabric, plastic film, etc., and shields and protects the unpainted part from paint. The above-mentioned film such as paper which fulfills this function is called a masking film for coating.

[0003] Masking films for coating include the shape of the object to be coated, the coating area, the performance of the paint used, the baking temperature of the paint,
There are various types depending on the drying temperature and the like. The coating masking film to be provided in the present invention is intended for coating having a relatively large painted area or non-painted area (that is, a masking area). Such a masking film does not need to have a function of adhering or temporarily adhering the entire surface to a non-painted portion (masked portion), but usually, an adhesive tape for bonding the film to an object to be coated is provided with an adhesive layer. Is bonded to one edge of the film while leaving a part of the film unbonded, or a pressure-sensitive adhesive layer is formed on the edge, and the film is placed on the edge to reduce the size of the product. It is folded parallel to the longitudinal direction.

[0004] A large number of masking films for coating of this type have been proposed, including the following: • A film obtained by inflation, T-die or the like from polypropylene containing a specific amount of an inorganic filler. A method of producing a gas-permeable masking film comprising continuously forming and continuously forming an adhesive layer on at least both end edges of one surface of the film by introducing the film into an adhesive coating device (Japanese Patent Application Laid-Open (JP-A) no. 61-21879
No. 3). In a masking film for building coating formed by folding and winding a sheet made of a synthetic resin in multiple layers, a marked masking film having a colored mark on the lower edge of the sheet (Japanese Utility Model Application Laid-Open No. 63-122667). A masking film provided along an edge of the adhesive portion to be adhered and held on a required portion, wherein the adhesive portion has a rear surface when the adhesive portion is applied with a tension parallel to the adhesive portion forming edge portion; A masking film for coating formed so as to be warped to the side (surface side) (Japanese Utility Model Laid-Open No. 57-35869). A masking film for painting in which the thickness of the adhesive tape and the thickness of the folded film are substantially the same, and the folded portion is positioned so as not to overlap the adhesive tape (Japanese Utility Model Application Laid-Open No. 48-94850). Gazette). At least a non-coated surface of the film is subjected to corona discharge treatment to give a wetting tension of 40 to 60 dyn / cm, and a part of the pressure-sensitive adhesive layer of the pressure-sensitive adhesive tape is applied to at least one corona discharge treated surface in the width direction of the film. A masking film for coating in which an adhesive tape is laminated so as to overlap with a corona discharge treated surface (Japanese Patent Publication No. 7-14990). -Adhesive tape is stuck to the transversal long film consisting of polyolefin and inorganic filler, the film is folded so that it does not overlap with the adhesive tape, and a film roll formed by winding it is cut with a cutter at the film drawer. A film set stored in a box (Japanese Utility Model Publication No. 56-38117). A biodegradable coating masking film made of polyethylene containing a specific amount of starch and an autoxidation accelerator (Japanese Patent Publication No. 7-106330).

[0005] The present inventor has further improved the manufacturability by applying a corona discharge treatment to the inner surface of a tubular film manufactured by the inflation method, folding the cut surface, cutting it out, and attaching an adhesive tape. Further, a masking film for coating excellent in workability without folding the film on the pressure-sensitive adhesive side of the pressure-sensitive adhesive tape and a method for producing the same have been developed (Japanese Patent No. 2514899).
As mentioned above, there are various types of masking films for coating, but the most currently manufactured and sold are polyolefin-based resins as the main raw materials, and thin tubular films are manufactured by the inflation method.
This is cut open, folded, an adhesive tape is stuck to one edge of the film, and wound into a roll.

[0006]

However, when a thin film of polyolefin is produced at a high speed, it often comes into contact with a die, a mandrel, a roll, etc., and is charged with static electricity. In addition, the masking film for coating absorbs the paint, prevents dripping, and peels off the film when the paint dries, so as not to pollute the surrounding environment, at least the outer and inner surfaces of the tubular film. On the other hand, a corona discharge treatment may be performed, and the thin film of the polyolefin may be strongly charged with static electricity. As described above, when the tubular film or the flat film is charged, in the masking film manufacturing process, the tubular films may stick to each other or stick together, thereby causing a problem of interrupting the manufacturing or causing a defective product. is there.

[0007] In particular, in order to make the product form compact,
When performing an operation of folding a tubular film or a flat film multiple times, this operation becomes difficult if the film is charged. In addition, when the finished product is charged, it absorbs dust, stains the painted surface at the time of painting, rewinds the roll, and unfolds the folded film, the films stick together, the unfolding work proceeds smoothly Otherwise, the work efficiency may be reduced, and in the curing operation at the coating site, the film may be attracted to the object by static electricity and the curing operation may be difficult.
Accordingly, an object of the present invention is to provide a masking film for coating which is hardly or does not carry static electricity, that is, has antistatic properties, a method for producing the same, and a tubular film for producing the masking film.

[0008]

That is, the present invention provides a step of folding a tubular film made of a polyolefin-based resin composition containing an antistatic agent substantially in parallel with the longitudinal direction; The step of exposing the inner surface of the tubular film by rotating the left or right portion toward the longitudinal direction of the cut film at the end of the film with the longitudinal direction as the rotation axis, exposing A step of laminating the adhesive tape in the longitudinal direction of the edge portion of the inner surface of the tubular film so that a part of the adhesive layer overlaps, a step of rolling the film to which the adhesive tape is laminated. The present invention relates to a method for producing a masking film for antistatic coating, which is characterized by the following.

The present invention is also directed to a step of making a cut in one longitudinal direction of a tubular film made of a polyolefin resin composition containing an antistatic agent, and left or right in the longitudinal direction of the cut film. Step of exposing the inner surface of the tubular film by rotating the portion at the end of the film with the longitudinal direction as a rotation axis, applying an adhesive tape in the longitudinal direction of the edge of the exposed inner surface of the tubular film to the adhesive layer And a method for producing a masking film for antistatic coating, characterized by comprising a step of laminating so as to partially overlap each other.

In the present invention, high-density polyethylene, medium-density polyethylene, high-pressure low-density polyethylene, linear low-density ethylene-α-olefin copolymer, ethylene-vinyl acetate copolymer, ethylene- Acrylic ester copolymers, polypropylene, poly-4-methylpentene-1 copolymer and the like can be mentioned. In particular, in the present invention, high-density polyethylene is preferred because of its excellent strength, cross-cutting property, handleability, workability, heat resistance and the like.

Examples of the antistatic agent in the present invention include anionic antistatic agents, cationic antistatic agents, nonionic antistatic agents and zwitterionic antistatic agents.

Examples of the anionic antistatic agent include sulfated oil, soap, sulfated ester oil, sulfated amide oil, sulfate salts of olefins, sulfate salts of fatty alcohols, alkyl sulfate salts, and fatty acid ethyl sulfonate salts. , Alkylnaphthalenesulfonates, alkylbenzenesulfonates, succinatesulfonates and phosphates.

Examples of the cationic antistatic agent include a primary amine salt, a tertiary amine, a quaternary ammonium compound, a pyridine derivative and the like.

Examples of the nonionic antistatic agent include glycerin fatty acid esters such as glycerin monolaurate,
Glycerin monomyristylate, glycerin monopalmitate, glycerin monostearate, glycerin monobehenate or glycerin monooleate; diglycerin fatty acid ester such as diglycerin monolaurate, diglycerin monomyristylate, diglycerin mono Palmitate, diglycerin monostearate, diglycerin monobehenate or diglycerin monooleate, etc .; sorbitan fatty acid ester, propylene glycol fatty acid ester, sucrose fatty acid ester, mono (di or tri) stearyl citrate, pentaerythritol fatty acid Ester, trimethylolpropane fatty acid ester, polyoxyethylene glycerin fatty acid ester, polyoxyethylene sorbitan fatty acid ester, polyethylene Recohol fatty acid ester, polypropylene glycol fatty acid ester, polyoxyethylene aliphatic alcohol ether, polyoxyethylene alkyl phenyl ether, polyoxypropylene-polyoxyethylene block polymer, polyethylene glycol, polypropylene glycol; N, N-bis (2-hydroxyethyl ) Aliphatic amines, such as N, N-bis (2-hydroxyethyl) laurylamine, N, N-bis (2-hydroxyethyl) myristylamine, N, N
-Bis (2-hydroxyethyl) palmitylamine,
N, N-bis (2-hydroxyethyl) stearylamine or N, N-bis (2-hydroxyethyl) oleylamine; N, N-bis (2-hydroxyisopropyl) aliphatic amine such as N, N-bis ( 2-hydroxyisopropyl) laurylamine, N, N-bis (2-
(Hydroxyisopropyl) myristylamine, N, N-
Bis (2-hydroxyisopropyl) palmitylamine, N, N-bis (2-hydroxyisopropyl) stearylamine or N, N-bis (2-hydroxyisopropyl) oleylamine; N, N-bis (2-hydroxyethyl) Fatty acid amides such as N, N-bis (2
-Hydroxyethyl) laurylamide, N, N-bis (2-hydroxyethyl) myristylamide, N, N-
Bis (2-hydroxyethyl) palmitylamide, N,
N-bis (2-hydroxyethyl) stearylamide,
N, N-bis (2-hydroxyethyl) behenylamide or N, N-bis (2-hydroxyisopropyl) oleylamide; N, N-bis (2-hydroxyisopropyl) fatty acid amide such as N, N-bis (2 -Hydroxyisopropyl) laurylamide, N, N-bis (2
-Hydroxyisopropyl) myristylamide, N, N
-Bis (2-hydroxyisopropyl) palmitylamide, N, N-bis (2-hydroxyisopropyl) stearylamide or N, N-bis (2-hydroxyisopropyl) oleylamide, or the above N, N-bis ( Examples include mono- or diesters of (2-hydroxyethyl) aliphatic amines with fatty acids such as lauric acid or stearic acid. Particularly, glycerin fatty acid monoester, N, N-bis (2-hydroxyethyl) aliphatic amine or N, N-bis (2-hydroxyethyl) aliphatic fatty acid monoester is preferable.

Examples of the amphoteric antistatic agent include a carboxylic acid derivative and an imidazoline derivative.

The compounding amount of the antistatic agent is appropriately selected according to the desired masking film, but is preferably 0.05 to 5 parts by weight based on 100 parts by weight of the polyolefin resin. If the amount is less than 0.05 parts by weight, the antistatic effect may not be exhibited. If the amount exceeds 5 parts by weight, the effect may be saturated, resulting in an increase in cost and undesirable cases. This is because the bleeding of the surface may hinder the development of the folded film.

The tubular film according to the present invention comprises:
Usually, it is produced by an inflation method, which is carried out by a conventional method of extruding a polyolefin-based resin composition from a circular die at a temperature higher than its melting temperature, introducing air into a tubular film, and air-cooling or water-cooling. The conditions of the above operation are appropriately selected, but the obtained tubular film preferably has a thickness of 5 to 50 μm. If the thickness is less than 5 μm, the film strength will be low, the film may be stiff, or the handling property may be deteriorated. If it exceeds 50 μm, the economy may be lost and the product may be folded compactly. This is because it becomes difficult.

The method for producing a masking film for antistatic coating according to the present invention comprises the steps of: (a) folding a tubular film made of a polyolefin resin composition containing an antistatic agent substantially parallel to the longitudinal direction ( Step A), a step of making a longitudinal cut at one location of the tubular film (step B), and a left or right portion of the cut film extending in the longitudinal direction at the end of the film. A step of rotating the direction about the rotation axis to expose the inner surface of the tubular film (step C); a part of the adhesive layer in the longitudinal direction of the edge of the inner surface of the tubular film having the exposed inner surface; A step of laminating so as to overlap (step D); and a step of rolling a film to which the adhesive tape has been laminated (step E).

The folding of the film in the step A is intended to reduce the width of the masking film and to reduce the size of the product together with the step E.
The form, such as multiple folding or a combination thereof, does not matter. In addition, it is preferable that the above-mentioned folding does not become the same surface as the pressure-sensitive adhesive layer side of the pressure-sensitive adhesive tape to be bonded in the step D (so-called outer folding type). When it is on the same surface, when sticking the adhesive tape on the painted surface, a part of the masking film will be attached to the painted surface together with the adhesive tape,
The folded part may not be stretched.

In the step B, while the tubular film is sequentially conveyed in the longitudinal direction, a thin blade metal cutter, a laser beam, a heat spot or the like is applied to one portion of the film.
A cut is made in the longitudinal direction of the film.

In the step C, the inner surface of the tubular film is exposed. This is about 90 to about 270 degrees, and preferably about 90 to about 270 degrees, with the left or right part in the longitudinal direction (progressing direction) of the film cut in step B at the end of the film and the longitudinal direction as the rotation axis. This can be done by rotating it 180 degrees.

In step D, an adhesive tape is attached in the longitudinal direction of the edge of the inner surface of the tubular film whose inner surface is exposed in step C such that a part of the adhesive layer overlaps the adhesive tape. Preferably, an adhesive tape having a width of 3 to 20 mm is provided on a surface having a width of 1 to 10 mm from an end of the film whose inner surface is exposed, and an unbonded portion having a width of 2 to 19 mm is left at an end of the adhesive tape. The other parts are laminated on the inner surface of the film and bonded.

In the step E, the adhesive tape-bonded film may be formed into a roll by winding the film around a core material along the longitudinal direction. Examples of the core material include a tubular body, for example, a solid tubular body (for example, a solid cylinder such as a rod) made of a similar material such as a paper tube, a plastic tube, a metal tube, or a wooden tube. A paper tube is preferable in terms of cost and performance. If there is no problem in production or use, the adhesive tape-bonded film itself may be wound without using a core material to form a roll.

If the masking film for antistatic coating of the present invention can be produced, the order of the above-mentioned steps A to E is not limited at all. For example, the following order: step A-
B-C-D-E, B-A-C-D-E, B-C-A-D
-E or B-C-D-A-E. Further, the present invention includes a method for producing a masking film for coating that lacks the steps A and E, that is, does not perform folding and roll winding.

In one preferred embodiment of the method of the present invention for producing a masking film for antistatic coating, one or both of an inner surface and an outer surface of a tubular film is subjected to a corona discharge treatment, and the treated surface is treated with a corona discharge treatment. What has a wetting tension of 40 dyn / cm or more is used.

By subjecting the tubular film to the corona discharge treatment, when the paint is applied to the masking film, no dripping occurs, and the dried paint does not peel off on the surface of the masking film, thereby polluting the environment. There is an advantage that properties desirable as a masking film film for coating are particularly improved. Note that the corona discharge treatment needs to be performed so that the wet tension of the treated surface is 40 dyn / cm or more in order to obtain the above advantages. There is no particular upper limit on the wetting tension due to the corona discharge treatment. However, if it is too high, the surface deteriorates and a problem occurs in the performance as a masking film. Therefore, it is preferable that the wetting tension is less than 60 dyn / cm. Corona discharge treatment for tubular film is performed only on the inner surface (including only a part of it), only the outer surface (including only part of it), both the inner and outer surfaces, the entire inner surface and a part of the outer surface, and the entire outer surface and the inner surface , Part of the inner surface and part of the outer surface, depending on the use of the coating masking film. A tubular film in which only the inner surface is treated is particularly desirable in terms of productivity, cost, and the like.

In the corona discharge treatment on the outer surface of the tubular film, for example, the inner surface of the running tubular film is brought into close contact (the tubular film is flattened), and at least a pair of electrodes to which a high voltage current is applied are connected to the film. This is performed by performing corona discharge in the presence of a gas with a gap of 1 to 7 mm. Further, the corona discharge treatment on the inner surface of the tubular film is performed, for example, by bringing the inner surface of the tubular film in a running state filled with a gas (for example, air, nitrogen gas, argon gas, xenon gas, carbon dioxide gas, etc.) into close contact. A gap of 1 to 7 mm is provided, and in a state where gas is present between the films, at least a pair of electrodes to which a high voltage current is applied are brought into contact with the outer surface of the film, and a corona discharge treatment is performed between the inner surfaces of the film. You. For a more detailed description, see, for example, Japanese Patent Publication No.
No. in the official gazette.

In another preferred embodiment of the method for producing a masking film for antistatic coating of the present invention, a polyolefin resin composition as a raw material of a tubular film contains a biodegradable (microbial degradable) resin, a photodegradable resin. At least one selected from the group consisting of a resin, a biodegradability (microbial degradability) imparting agent, a photodegradability imparting agent, and an inorganic filler is further blended.

In the present invention, examples of the biodegradable resin include polycaprolactone, aliphatic polyester such as polylactic acid, polyglycolic acid or polyhydroxybutyrate, aliphatic copolymerized polyester, polyurethane resin, polyamide resin, polyvinyl alcohol, and the like. Polyethers, such as polyethylene glycol or polypropylene glycol, and the like, and photodegradable resins include ethylene-carbon monoxide copolymers, polyketones, such as vinyl ketone copolymers. When the biodegradable resin and / or the photodegradable resin is blended, the blending amount is not particularly limited.
Preferably up to about 100 parts by weight per 0 parts by weight. This is due to the fact that even if it is blended more than that, there is no or little performance improvement due to each of the blended resins, and it is not economical.

Examples of the biodegradability-imparting agent include monosaccharides such as glucose, galactose, mannose and fructose; disaccharides such as maltose, lactose and sucrose;
Polysaccharides such as starch, dextrin, cellulose, inulin, agarose, and fructan; amino sugars such as chitin, chitosan, amikacin and sisomacsin; reducing sugars such as aldose, ketose and heptose; sugar alcohols such as detritol and pentitol; Can be. Starch and its derivatives, which are easily available and inexpensive, are preferred in that films containing them can be easily produced, the performance of the film is high, and the biodegradability is good. Examples of starch and its derivatives include starch obtained from corn, potato, rice, sweet potato, wheat, and the like, those obtained by grafting a polymerizable monomer such as styrene to the starch, those coated with silicon or the like, and those such as glucose. Examples include starch derivatives such as modified starch containing sugars, molasses, and casein sugar as main components and modified with organic substances that are taken in favor by living organisms.

The blending amount of the biodegradability-imparting agent is not particularly limited as long as the obtained film has biodegradability, and varies widely depending on the type of the biodegradability-imparting agent used, the use of the film, and the like. However, the biodegradability-imparting agent is usually 1 to 80% in 100% by weight of the composition with the polyolefin resin.
%, Preferably 5 to 70% by weight. In particular, when starch or a derivative thereof is blended as a biodegradability-imparting agent, the amount of the blend is 100%.
It is from 5 to 70% by weight, preferably from 6 to 50% by weight, especially from 7 to 20% by weight, based on% by weight. If the starch or its derivative is at least 5% by weight, the biodegradability will increase as the amount increases, and if it exceeds 70% by weight, the physical properties of the polyolefin-based resin will be remarkably reduced, making it unsuitable for practical use as a film. is there.

Further, a photodegradability-imparting agent, an additive generally called a photosensitive reagent, such as a photosensitizer having a carbonyl group (benzophenone, acetophenone, anthraquinone, etc.) or a metal compound (metal salt of an organic acid, etc.) Incorporation of such a compound can impart photodegradability in addition to biodegradability, and can promote decomposition of the film after disposal. If the film contains a photodegradability-imparting agent, even if the microorganisms that decompose the film are small in the soil or water in which the film was discarded, the waste film has come out of the ground or water from the soil or water. Even in this case, the decomposition of the film proceeds rapidly. Therefore, in a preferred embodiment of the present invention, the tubular film or film is produced from a resin composition containing a photodegradability-imparting agent in addition to a biodegradability-imparting agent.

Specific examples of the photodegradability-imparting agent include the following: iron diethyldithiocarbamate, manganese diethyldithiocarbamate, zinc dibutyldithiocarbamate, zinc diisopropyldithiophosphate, 1,4-benzoquinone, benzylidenephthalide , Β- [cyanobenzylidene] phthalide, No
-Phenyl-3-benzylidenephthalomidine, anthraquinone and its derivatives, benzophenone and its derivatives, benzotriazole and its derivatives, 1,2
-Dibenzoylethylene, dibenzoylbenzene, ditoluylbenzene, indandione, indanone, coumaranone, fatty acid metal salts (eg, cobalt acetate, nickel acetate, nickel laurate, copper stearate, ferric stearate, zinc stearate, etc.) , Iron acetyl lactonate, 2-hydroxy-4-octyloxybenzophenone and the like, or one or more combinations thereof.

The amount of the photodegradability-imparting agent varies depending on the intended photodegradability, but the photodegradability-imparting agent is usually 0.2 to 10% in 100% by weight of the composition with the polyolefin resin.
%, Preferably 0.5 to 10% by weight.

In the present invention, any inorganic filler may be used as long as it has a paint adsorbing property, but calcium carbonate, talc, calcium sulfite, aluminum hydroxide, water, etc. are preferred in terms of price, physical properties, hue and the like. Magnesium oxide, clay, calcium silicate, hydrotalcite, silica or zeolite are desirable, and calcium carbonate is particularly desirable. In addition, since the surface of the inorganic filler is polar and has poor affinity with a polyolefin resin such as nonpolar high-density polyethylene, the inorganic filler is replaced with a higher fatty acid or a metal salt thereof, a silane coupling agent, a titanium cup. Surface treatment with a ring agent, an aluminum-based coupling agent, or the like is preferable because it enhances the affinity with the resin and contributes to obtaining a film of uniform quality.

The average particle diameter of the inorganic filler in the present invention is preferably from 1.0 to 20 μm, particularly preferably from 2 to 5 μm. Here, the average particle diameter is a value obtained by dividing a value obtained by multiplying each particle by the number of particles by the total number of particles, and this is 1.0%.
If it is less than μm, it is difficult for the particles to coagulate and disperse uniformly in the film, and may adversely affect the air permeability of the film and the adsorptivity of the paint. If it exceeds 20 μm, the upper limit of the preferred thickness of the film In some cases, it may be difficult to produce a film having a thickness of 50 μm or less.

The inorganic filler is a polyolefin resin 10
It is preferable to mix up to 50 parts by weight with respect to 0 parts by weight. This is because if it exceeds 50 parts by weight, it may be difficult to form a film.

In addition, the polyolefin resin composition of the present invention contains an autoxidizing agent in addition to the above-mentioned biodegradable resin, photodegradable resin, biodegradable agent, photodegradable agent and inorganic filler. By adding oxidized oil, metal salt, metal oxide or metal hydroxide, the decomposition of the film in soil or water can be further promoted. It goes without saying that the amounts of these other additives are adjusted so as not to impair the object of the present invention. As an autoxidizing agent, a substance that promotes the oxidative decomposition of a polyolefin resin having a carbon-carbon double bond such as oleic acid or an ester thereof, and as an oxidizing oil, animal oil (tallow, lard, milk, etc.) or vegetable oil (rapeseed oil) , Corn oil, sunflower oil, safflower oil, etc.) and metal salts,
As the metal oxide or metal hydroxide, sodium,
Inorganic acid salts (sulfates, hydrochlorides, carbonates, etc.) or organic acid salts (carboxylates, etc.) such as potassium, calcium, magnesium, zinc, aluminum, manganese or iron
And oxides and hydroxides.

Furthermore, the present invention relates to the following masking film itself for antistatic coating: an edge portion of the inner surface of the tubular film formed by cutting a tubular film made of a polyolefin resin composition containing an antistatic agent in the longitudinal direction. The pressure-sensitive adhesive tape is bonded so that a part of the pressure-sensitive adhesive layer overlaps, at least a part other than the film to which the pressure-sensitive adhesive tape is bonded is folded substantially parallel to the longitudinal direction, and the film is stretched longitudinally. An antistatic coating masking film wound in a roll along the direction.・ Electrification is performed by adhering an adhesive tape to the edge of the inner surface of a tubular film made of a polyolefin-based resin composition containing an antistatic agent, which is cut open in the longitudinal direction so that a part of the adhesive layer is overlapped. Masking film for prevention coating. An antistatic coating masking film in which an adhesive tape is attached to an edge portion of a film made of a polyolefin-based resin composition containing an antistatic agent so that a part of the adhesive layer is overlapped. The tubular film is subjected to a corona discharge treatment on one or both of the inner surface and the outer surface thereof, and the wetting tension of the treated surface is 40 dyn / cm or more, or the film has a corona discharge treatment on at least one surface thereof. Any of the above masking films for antistatic coating, wherein the masking film is applied and has a wetting tension of 40 dyn / cm or more. Any of the above, wherein the polyolefin-based resin composition further contains at least one selected from the group consisting of a biodegradable resin, a photodegradable resin, a biodegradability-imparting agent, a photodegradability-imparting agent, and an inorganic filler powder. Masking film for antistatic coating.

The present invention also relates to the following tubular film for producing the antistatic coating masking film of the present invention. -A tubular film for producing an antistatic coating masking film produced from a polyolefin resin composition containing an antistatic agent. -The above tubular film in the form of a roll. -Corona discharge treatment is performed on one or both of the inner surface and the outer surface, and the wet tension of the treated surface is 40 dyn / cm.
Any of the above tubular films. Any of the above, wherein the polyolefin-based resin composition further contains at least one selected from the group consisting of a biodegradable resin, a photodegradable resin, a biodegradability-imparting agent, a photodegradability-imparting agent, and an inorganic filler powder. Kano tubular film.

In the masking film for antistatic coating of the present invention and the tubular film for producing the same, the respective raw material components, numerical values, and the like, and preferred embodiments thereof, are described. What was described for the manufacturing method applies as is.

[0042]

BEST MODE FOR CARRYING OUT THE INVENTION The tubular film of the present invention can be easily folded into an appropriate length, or rolled around a tubular body such as a paper tube, so that it can be easily formed into a product form generally called a raw material. It can be. The masking film for antistatic coating of the present invention obtained from the tubular film is, for example, a building, a road, an airfield, a playground,
It is suitably used for painting floors, walls, automobiles, ships, airplanes, vehicles, machinery, office supplies, sports supplies, amusement supplies, leisure supplies, various displays, toys, woodwork, household goods, and the like. After being folded, the masking film for antistatic coating of the present invention, which is wound around a tubular body such as a paper tube to form a roll, is further compacted and improved in usability. When the film is rewound and unfolded, the films do not stick to each other or cling to the object. Moreover, since the film does not adsorb dust, the painted surface is not stained by such dust. In addition, even when the masking film for antistatic coating of the present invention is manufactured, the films do not stick to each other, so that it is possible to perform an efficient operation without interrupting continuous work, and to adsorb dust. No quality degradation due to

[0043]

Next, the present invention will be described in more detail with reference to examples, but the present invention is not limited to these examples.

Example 1 Density 0.955 g / ml, melt index 0.08
g / 10 minutes of a resin composition of a high-density polyethylene and an antistatic agent (a master batch comprising 100 parts by weight of the high-density polyethylene, 0.03 parts by weight of glycerin monostearate and 0.03 parts by weight of stearyldiethanolamide) It was extruded from a die at 190 ° C., and a tubular film having a thickness of 10 μm and a folding diameter of 25 cm was obtained by an air-cooled inflation method under the conditions of a blow ratio of 4.2 and a winding speed of 50 m / min. A thin razor blade is used to make a single cut in the center of the tubular film (at a position 10 cm from the left end of the flat film because the fold diameter is 25 cm), and then the left end of the flat film The upper film piece of the flat film existing to the left from the cut with the longitudinal direction as the rotation axis is 180
And the inner surface of the film piece was exposed. An adhesive tape having a width of 15 mm is stuck along the longitudinal direction of the film on the left end of the exposed piece of the film piece at a width of 5 mm so as to face a part of the adhesive layer (5 mm in width) facing the exposed inner surface of the film. Wearing. On the other hand, the flat film other than the portion where the adhesive tape is bonded is folded in multiple layers by repeating gusset folding and double folding on the surface opposite to the surface of the adhesive layer of the adhesive tape, and this is folded into a 12 cm long paper tube. The film was roll-wound to a diameter of 10 cm to obtain a roll-shaped coating masking film. FIG. 1 shows a perspective view when the end portion of the obtained coating masking film 1 is pulled out. In the figure, 2 is a film, 3 is an adhesive tape, and 4 is a paper tube.
And c are the surface derived from the inner surface of the tubular film, the surface derived from the outer surface of the tubular film, and the pressure-sensitive adhesive layer, respectively.

The masking film obtained as described above was evaluated. First, in the above manufacturing process, no accident caused by static electricity occurred at all for 10 days. In addition, in the work of unwinding a product (a roll-shaped masking film for coating) to a length of 1 m from a roll, cutting, unfolding the folded portion, and attaching the film to an object to be coated, the film may stick together. The curing operation could be performed smoothly without the film being adsorbed to the object.

Comparative Example 1 The procedure of Example 1 was repeated except that no antistatic agent was used.
The same operation as in Example 1 was repeated. In the manufacturing process, the operation had to be stopped five times in 10 days due to the generation of static electricity. Further, when unfolding the folded portion of the product, the films were stuck together, and the work could not be performed smoothly. Furthermore, in the curing operation at the painting site, the film was attracted to the object, and the curing operation was extremely difficult. In addition, the product itself also adsorbed dust, which not only reduced the commercial value, but also contaminated the painted surface with the adsorbed dust. Moreover, when the paint was actually sprayed, dripping phenomenon and scattering of the dried paint were recognized.

Example 2 Density 0.922 g / ml, melt index 2.5 g
100 parts by weight of a high-pressure low-density polyethylene of / 10 minutes, 0.05 parts by weight of an antistatic agent (diglycerin monomyristylate and 0.05 parts by weight of N, N-bis (2-hydroxyethyl) palmitylamide) In the form of a masterbatch blended with high pressure low density polyethylene).
06 parts by weight and calcium carbonate (having an average particle diameter of 1.5 μm surface-treated with calcium stearate) 2
0 parts by weight of a resin composition at 210 ° C.
Extrusion (15mmφ, die gap 1.2mm)
kg / hr), a blow ratio of 2.9 and a take-up speed of 35 m / min.
A tubular film having a folding diameter of 30 cm was obtained. next,
The inner surface gap of the obtained tubular film was 2 mm, the gas inside the film was air, and the wetting tension of the film inner surface was 48 dyn / using a film inner surface corona discharge treatment machine.
cm, and then gusset-folded in parallel to the longitudinal direction, and then, at the approximate center of the tubular film, cut in parallel with the longitudinal direction with a thin razor blade. The upper film piece of the flat film existing to the left from the cut was rotated about 90 degrees with the left end longitudinal direction as a rotation axis, and the inner surface of the film piece was exposed (the exposed inner surface and the folded multiple portion are flush with each other). It is in). 15m wide along the longitudinal direction of the film on the left end 5mm wide of the exposed inner surface of the film piece
m of the pressure-sensitive adhesive tape was adhered so that a part (5 mm in width) of the pressure-sensitive adhesive layer was opposed to the inner surface of the film.
This is roll-wound to a diameter of 5 cm around a 8 cm long paper tube,
A roll-shaped masking film for coating was obtained.

The masking film obtained as described above was evaluated. First, in the above manufacturing process, no accident caused by static electricity occurred at all for 10 days. In addition, in the work of unwinding a product (a roll-shaped masking film for coating) to a length of 1 m from a roll, cutting, unfolding the folded portion, and attaching the film to an object to be coated, the film may stick together. The curing operation could be performed smoothly without the film being adsorbed to the object.
Further, when the paint was actually applied, there was no dripping phenomenon of the paint, and the dried paint was firmly attached without being scattered.

Comparative Example 2 Except that no antistatic agent was used in Example 2,
The same operation as in Example 2 was repeated. In the manufacturing process, the operation had to be stopped eight times in 10 days due to the generation of static electricity. Further, when unfolding the folded portion of the product, the films were stuck together, and the work could not be performed smoothly. Furthermore, in the curing operation at the painting site, the film was attracted to the object, and the curing operation was extremely difficult. In addition, the product itself adsorbs dust, not only reducing the commercial value, but also contaminating the painted surface with the adsorbed dust.

Example 3 Density 0.932 g / ml, melt index 0.8 g
100 parts by weight of an ethylene-octene-1 copolymer / 10 minutes, 20 parts by weight of modified corn starch particles surface-treated with a silane coupling agent, 1 part by weight of iron diethyldithiocarbamate, 0.8 part by weight of diglycerin monolaurate And a resin composition comprising 0.05 parts by weight of oleyl diethanolamide was supplied to an air-cooled inflation extruder, and extruded at 220 ° C. from a die (diameter 65 mmφ, die gap 1.5 mm) (18 kg / hour), blow ratio 3.3. At a winding speed of 45 m / min, a thickness of 45 μm,
A tubular film having a folding diameter of 20 cm was obtained. next,
While sequentially transporting the obtained tubular film in the longitudinal direction, the outer surface of the film is subjected to corona discharge treatment so as to have a wetting tension of 45 dyn / cm, and when the tubular film is flattened, a portion 2 cm from the left end thereof. A thin razor blade is used to make a cut parallel to the longitudinal direction, and the film part on the right side of the cut is double-folded in parallel to the longitudinal direction.
Then, the upper film piece of the flat film existing to the left from the cut was rotated 135 ° with the left end longitudinal direction of the flat film as a rotation axis, and the inner surface of the film piece was exposed. A width 15 mm along the longitudinal direction of the film on the left end of the film piece 5 mm wide at the side exposed as described above.
mm adhesive tape was stuck. This was roll-wound to a diameter of 10 cm around a paper tube having a length of 10 cm to obtain a roll-shaped masking film for coating. In the masking film, the folded multiple film portion is on a side different from the surface of the pressure-sensitive adhesive layer of the pressure-sensitive adhesive tape, and the corona discharge treated surface is formed to be the masking film surface.

The masking film obtained as described above was evaluated. First, in the above manufacturing process, no accident caused by static electricity occurred at all for 10 days. In addition, in the work of unwinding a product (a roll-shaped masking film for coating) to a length of 1 m from a roll, cutting, unfolding the folded portion, and attaching the film to an object to be coated, the film may stick together. The curing operation could be performed smoothly without the film being adsorbed to the object.
Further, when the paint was actually applied, there was no dripping phenomenon of the paint, and the dried paint was firmly attached without being scattered. This masking film had biodegradability and photodegradability, and was quickly decomposed by disposal after use.

Comparative Example 3 The same operation as in Example 3 was repeated, except that the antistatic agent (diglycerin monolaurate and oleyldiethanolamide) was not used. In the manufacturing process, the operation had to be stopped seven times in 10 days due to the generation of static electricity. Also, when unfolding the folded part of the product, the films stick together,
I couldn't work smoothly. Furthermore, in the curing operation at the painting site, the film was attracted to the object, and the curing operation was extremely difficult. In addition, the product itself adsorbs dust, not only reducing the commercial value, but also contaminating the painted surface with the adsorbed dust.

Example 4 Density 0.930 g / ml, Melt Index 2.5 g
/ 10 minutes, 55 parts by weight of an ethylene-ethyl acrylate copolymer having an ethyl acrylate content of 15% by weight, a photodegradable resin (density: 0.925 g / ml, melt index: 3.5 g / 10 minutes, carbon monoxide content: 1 % Ethylene-
45 parts by weight of carbon monoxide copolymer), cobalt acetate 0.1
Parts by weight, a resin composition comprising 0.07 parts by weight of glycerin monocaprate and 0.05 parts by weight of lauryl diethanolamide was supplied to an air-cooled inflation extruder, and a die (diameter: 75 mmφ, die gap: 1.2 mm) was obtained at 205 ° C. Extrusion (16 kg / hr), blow ratio 3.8, winding speed 60 m / min, thickness 20 μm,
A tubular film having a folding diameter of 25 cm was obtained. next,
While sequentially transporting the obtained tubular film in the longitudinal direction, the inner and outer surfaces of the film were subjected to corona discharge treatment so as to have a wetting tension of 45 dyn / cm, and when the tubular film was flattened, 1 cm from the left end thereof. A cut is made in the place in parallel with the longitudinal direction with a thin razor blade, and then the upper film piece of the flat film existing to the left from the cut with the left end longitudinal direction of the flat film as the axis of rotation is 1
The film was rotated by 80 degrees to expose the inner surface of the film piece, and the film portion on the right side of the cut was double-folded three times in parallel in the longitudinal direction (the exposed inner surface and the folded multiple portion are on the same plane). . An adhesive tape having a width of 15 mm was stuck along the longitudinal direction of the film on a 5 mm width at the left end of the exposed inner surface of the film piece so that a part of the adhesive layer (5 mm in width) was opposed to the exposed inner surface. . This is length 8c
m was roll-wound to a diameter of 6 cm around a paper tube to obtain a roll-shaped coating masking film.

The masking film obtained as described above was evaluated. First, in the above manufacturing process, no accident caused by static electricity occurred at all for 10 days. In addition, in the work of unwinding a product (a roll-shaped masking film for coating) to a length of 1 m from a roll, cutting, unfolding the folded portion, and attaching the film to an object to be coated, the film may stick together. The curing operation could be performed smoothly without the film being adsorbed to the object.
Further, when the paint was actually applied, there was no dripping phenomenon of the paint, and the dried paint was firmly attached without being scattered. This masking film had photodegradability and was quickly decomposed by disposal after use.

Comparative Example 4 The same operation as in Example 4 was repeated, except that the antistatic agent (glycerin monocaprate and lauryl diethanol) was not used. In the manufacturing process, the operation had to be stopped six times in 10 days due to the generation of static electricity. Also, when unfolding the folded part of the product, the films stick together,
I couldn't work smoothly. Furthermore, in the curing operation at the painting site, the film was attracted to the object, and the curing operation was extremely difficult. In addition, the product itself adsorbs dust, not only reducing the commercial value, but also contaminating the painted surface with the adsorbed dust.

In the above examples, the masking film for coating is manufactured continuously from the manufacturing of the tubular film. However, the tubular film is made flat and folded in parallel in the longitudinal direction. A roll of tubular film can be manufactured by rolling along the longitudinal direction, and the tubular film is folded in parallel with the longitudinal direction, or perpendicularly, or in both directions, and is itself combined with the product. can do. FIG. 2 shows a cross-sectional view of the tubular film. In the figure, reference numeral 2 'denotes a tubular film made of a polyolefin-based resin mixed with an antistatic agent, and d in a two-dot chain line shows an example of the position of a cut when the adhesive tape is cut open. Such a tubular film may be used as a roll as it is, but at this stage, for compactness, it may be folded parallel to the longitudinal direction to obtain a roll. FIG. 3 shows a paper tube 4 after being folded.
FIG. The folding here is a gusset-fold of the tubular film from both sides.

[0057]

Since the cost and quality of the masking film for coating are regarded as important, the cost is low and the raw material is a polyolefin resin which can be blown into an ultra-thin film, and the high speed is 30 to 120 m / min by the inflation method. Most are currently manufactured from tubular films formed in However, polyolefin resins have low or no conductivity, so they are charged with static electricity, the films stick to each other during the manufacturing process, and continuous operation may need to be stopped.This reduces the efficiency of manufacturing and reduces manufacturing costs. Contributed to the rise. In addition, the masking film for coating is usually folded into a very thin film in multiple layers and rolled into a product form in consideration of ease of use during storage, transportation, and curing work. , And when unfolding, the film clings together, unfolding work to the curing section, sticking work is not performed smoothly,
Further, in the curing work at the coating site, the workability is remarkably deteriorated due to the film being attracted to the object by static electricity. Further, there is also a problem that the quality is deteriorated and the appearance of the product is spoiled due to the fact that the dust and the like are easily adsorbed.

The present invention solves the above-mentioned conventional problems by adding an antistatic agent to a resin composition as a raw material of a coating masking film, which has not been reported in the art. It is the first thing I found. According to the present invention, problems in the manufacturing process due to static electricity and problems in using the product, which have been a matter of concern in the art, can be solved at once. Furthermore, the coating masking film of the present invention does not adsorb dust and does not cause quality deterioration,
There is no problem that impairs the beauty of the product.

Further, the masking film for antistatic coating of the present invention can be obtained by subjecting a tubular film to a corona discharge treatment so that the coating easily adheres, does not flow, and does not peel off after drying. In particular, the quality required can be enhanced. further,
By blending a biodegradable resin, a photodegradable resin, a biodegradability-imparting agent, a photodegradability-imparting agent, and / or an inorganic filler with a polyolefin-based resin raw material, paint adhesion is enhanced and the film is excellent as a masking film. In addition, when the film is discarded after use, the film is rapidly decomposed by microorganisms, light, or the like, so that a film having environmentally friendly physical properties can be obtained.

According to the method for producing a masking film for antistatic coating of the present invention, the problems caused by static electricity as described above are solved, and a masking film excellent in workability is continuously operated during the production process. It can be manufactured with high efficiency and at low cost without performing. Also,
The manufacturing method of the present invention has an advantage that a conventional manufacturing line can be used as it is. Furthermore, the tubular film of the present invention can be cut and opened, and a simple operation of attaching an adhesive tape to one end thereof, the film adheres to the target when attached to the target, or the films adhere to each other, A masking film for painting can surely prevent operational problems such as the folded film portion not being unfolded.

[Brief description of the drawings]

FIG. 1 is a perspective view of a masking film for antistatic coating in a roll shape obtained in one embodiment of the present invention.

FIG. 2 is a cross-sectional view of a tubular film for producing a masking film for antistatic coating obtained in another example of the present invention.

FIG. 3 is a perspective view of a roll-shaped tubular film for producing an antistatic coating masking film obtained in still another embodiment of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Masking film for antistatic coating 2 Film 2 'tubular film 3 Adhesive tape 4 Core material (paper tube) 5 Tubular film roll a Surface derived from the inner surface of the tubular film b Surface derived from the outer surface of the tubular film c Adhesive layer

──────────────────────────────────────────────────の Continued on front page (51) Int.Cl. ⁶ Identification code FI B29K 105: 16

Claims (13)

[Claims] 1. A step of folding a tubular film made of a polyolefin resin composition containing an antistatic agent substantially parallel to a longitudinal direction, a step of making a cut in one place of the tubular film in a longitudinal direction, and making a cut. Exposing the inner surface of the tubular film by rotating the left or right portion toward the longitudinal direction of the film at the end of the film around the longitudinal direction as a rotation axis, the edge of the exposed inner surface of the tubular film A step of laminating an adhesive tape in the longitudinal direction so that a part of the adhesive layer overlaps, and a step of rolling a film on which the adhesive tape is laminated, the masking film for antistatic coating. Manufacturing method. 2. A step of making a cut in a longitudinal direction at one position of a tubular film made of a polyolefin resin composition containing an antistatic agent, wherein a left or right portion of the cut film with respect to the longitudinal direction is formed. A step of exposing the inner surface of the tubular film by rotating the longitudinal direction as a rotation axis at the end of the film, and applying an adhesive tape in the longitudinal direction of the edge of the exposed inner surface of the tubular film to a part of the adhesive layer. A method for producing a masking film for antistatic coating, comprising a step of laminating so as to overlap with each other. 3. The tubular film according to claim 1, wherein one or both of an inner surface and an outer surface of the tubular film is subjected to a corona discharge treatment, and the treated surface has a wetting tension of 40 dyn / cm or more. For producing an antistatic coating masking film. 4. The polyolefin resin composition further comprises at least one selected from the group consisting of a biodegradable resin, a photodegradable resin, a biodegradability-imparting agent, a photodegradability-imparting agent and an inorganic filler. The method for producing a masking film for antistatic coating according to any one of claims 1 to 3. 5. A pressure-sensitive adhesive tape is adhered to a tubular film made of a polyolefin-based resin composition containing an antistatic agent so that a part of the pressure-sensitive adhesive layer overlaps an edge of an inner surface of the film which is cut open in a longitudinal direction. At least a part other than the film to which the adhesive tape is bonded is folded substantially parallel to the longitudinal direction, and the film is wound in a roll shape along the longitudinal direction to form an antistatic coating mask. the film. 6. A pressure-sensitive adhesive tape is attached to an edge portion of an inner surface of a tubular film made of a polyolefin resin composition containing an antistatic agent, which is cut open in a longitudinal direction so that a part of the pressure-sensitive adhesive layer is overlapped. A masking film for antistatic coating. 7. A masking film for antistatic coating in which an adhesive tape is adhered to an edge portion of a film made of a polyolefin-based resin composition containing an antistatic agent so that a part of the adhesive layer is overlapped. . 8. A corona discharge treatment is applied to one or both of the inner surface and the outer surface, and the wetting tension of the treated surface is 40 d.
The tubular film having a thickness of at least yn / cm or a film having at least one surface subjected to a corona discharge treatment and having a wet tension of at least 40 dyn / cm at the treated surface is used. The masking film for antistatic coating according to the above. 9. The polyolefin resin composition further comprises at least one selected from the group consisting of a biodegradable resin, a photodegradable resin, a biodegradability-imparting agent, a photodegradability-imparting agent and an inorganic filler. The masking film for antistatic coating according to any one of claims 5 to 8. 10. A tubular film for producing a masking film for antistatic coating, produced from a polyolefin resin composition containing an antistatic agent. 11. The tubular film according to claim 10, which is in the form of a roll. 12. A corona discharge treatment is applied to one or both of the inner surface and the outer surface, and the treated surface has a wetting tension of 4%.
The tubular film according to claim 10, wherein the thickness is 0 dyn / cm or more. 13. The polyolefin resin composition further comprises at least one selected from the group consisting of a biodegradable resin, a photodegradable resin, a biodegradability-imparting agent, a photodegradability-imparting agent and an inorganic filler. Claims 10 to 12
The tubular film according to any one of the above.