KR101511997B1 - Layered film - Google Patents

Abstract

The present invention provides a laminated film having improved flame retardancy and having flame retardancy levels equivalent to HBF, HB, and V-2 specified in UNDERWORLD LABORATORIES standard UL-94. The laminated film of the present invention is characterized in that at least one coating layer containing a flame retardant containing no silicon element and a compound containing a silicon element is formed on at least one side of the base thermoplastic resin film and a silicon element with respect to the mass of the entire coating layer is (F) (mass%) of the flame retardant which does not contain the silicon compound and the content S (mass%) of the silicon element with respect to the mass of the whole coating layer satisfy the following conditions (i) to (iii).
(i) F (mass%)? 30
(ii) S (mass%)? 0.03
(iii) F + S (mass%)? 60
Further, the lamp reflector for backlight, the backlight, and the backlight equipped with the LED of the present invention are each constructed using such a laminated film.

Description

Laminated film {LAYERED FILM}

The present invention relates to a laminated film having flame retardancy for use in electronic parts and the like. More particularly, the present invention relates to a laminated film for assembling to a backlight for a liquid crystal display or the like, a laminated film for a sealing film or a back sheet of a solar cell module, a paper substitute such as a card, a label, a seal, Used as the base material of the receptacle sheet used for various printing records such as cardboard printers, bar codes, posters, maps, cardboard, display boards, white boards, thermal transfer, offset printing, telephone cards and IC cards A laminated film for use in electronic parts such as a lighting device, an indirect lighting device, a member mounted on an automobile, a railroad, an aircraft, or a circuit material.

In liquid crystal televisions and solar cell modules, a large number of thermoplastic resin films are used in terms of productivity and price. For example, reflective films for reflecting light from a light source and sunlight are used for a backlight in a liquid crystal television and sheets for back sealing, respectively, in a solar cell module. As such a reflective film, a porous white thermoplastic resin film formed by bubbles is generally used (see Patent Document 1).

Reflective films used for liquid crystal televisions and solar cell modules are strongly required to have improved reflection properties, while flame retardancy is required at the same time. For this reason, for example, in a liquid crystal television, in order to improve various characteristics of luminance and color reproducibility of a screen, the output of a cold cathode tube used for a backlight is increased, or a heat or leakage current It is necessary to ensure safety against ignition and burning of the reflective film used by the light source. For example, the internal temperature of a backlight for a liquid crystal television generally rises to about 70 ° C to 90 ° C, which may cause generation of a leakage current or a fear of ignition due to unexpected contact with a driving circuit.

However, since the thermoplastic resin film itself has a void structure inside the film in the case of the white thermoplastic resin film used for the reflection film, because the thermoplastic resin film itself is mainly composed of the organic material, the combustion is not stopped when the ignition occurs once, Air present inside the void promotes combustion. Various methods for improving the flame retardancy of these thermoplastic resin films have been proposed. For example, there has been proposed a method in which a flame retardant agent or a flame retarding agent is directly contained in a resin of a polyester-based resin foam to impart flame retardancy (see Patent Document 2). Further, there is proposed a method in which a flame retardant is further added by adding a flame retardant to a polycarbonate resin, which is a heat-resistant resin, by adding a silicone compound and kneading and molding it together with titanium oxide to impart flame retardancy (see Patent Document 3) (See Patent Documents 4 to 6). Further, a flame retardant coating agent in which a flame retardant agent is dispersed in a resin or a solvent has been proposed (see Patent Documents 7 and 8). It is also possible to impart flame retardancy by applying these flame retardant coating agents onto a substrate thermoplastic resin film.

Japanese Patent Laid-Open No. 8-262208 Japanese Patent Application Laid-Open No. 2006-249158 Japanese Patent Application Laid-Open No. 2007-2075 Japanese Patent Application Laid-Open No. 2006-28267 Japanese Patent Application Laid-Open No. 2006-30405 Japanese Patent Application Laid-Open No. 2006-169451 Japanese Patent Application Laid-Open No. 2002-69384 Japanese Patent Application Laid-Open No. 2004-39273

However, as in Patent Documents 2 to 6, the method of kneading a heat-resistant compound or a flame-retardant compound with a foamable resin or a heat-resistant resin to form a molded article is substantially limited in terms of productivity and cost, And the like. It is necessary to add a large amount of a flame retardant and an additive in order to impart flame retardancy in a method of applying a flame retardant coating agent dispersed in a resin or a solvent to a substrate thermoplastic resin film as in Patent Documents 7 and 8, There is a problem that peeling occurs due to low adhesiveness, or coating property of the coating agent is poor and the appearance is damaged.

The present invention adopts the following means in order to solve such a problem. That is, the present invention relates to a thermoplastic resin film comprising at least one coating layer containing a flame retardant containing no silicon element and a compound containing a silicon element on at least one side of the base thermoplastic resin film, and containing a silicon element with respect to the mass of the entire coating layer (Mass%) of the flame retardant and the content rate S (mass%) of the silicon element with respect to the mass of the entire coating layer satisfy the following conditions (i) to (iii).

(i) F (mass%)? 30

(ii) S (mass%)? 0.03

(iii) F + S (mass%)? 60

Further, the lamp reflector, the direct-type backlight, and the direct-type backlight equipped with the LED of the present invention are each constructed using the laminated film of the present invention.

(Effects of the Invention)

According to the present invention, it is possible to provide a laminated film having flame retardancy levels equivalent to HBF, HB and V-2 specified in UNDERWRITERS LABORATORIES standard UL-94 (hereinafter referred to as UL-94). The laminated film of the present invention can be used as a reflector of an edge light type backlight for a liquid crystal display, a reflector of a direct type backlight, a backlight carrying an LED, a reflecting plate of various surface light sources, Or as a back sheet.

1 is an example of a cross-sectional view of a laminated film of the present invention.
2 is an example of a cross-sectional view of the base thermoplastic resin film according to the present invention.

The present invention has been extensively studied on a thermoplastic resin film having a flame retardancy level equivalent to HBF, HB and V-2 specified in UL-94, and it has been found that the base thermoplastic resin film has at least one coating layer on at least one surface thereof, The content of the additive such as the flame retardant and the kind of the additive contained in the flame retardant have been used to solve the above problems.

The laminated film of the present invention is formed by forming at least one coating layer containing a flame retardant containing no silicon element and a compound containing a silicon element on at least one side of the base thermoplastic resin film. Further, the silicon element in the coating layer uses a compound containing a silicon element in the molecular structure for reasons of handleability, productivity, price, difficulty in obtaining, and a delayed burning effect for improving flame retardancy as described later Is preferably contained. Further, although a flame retardant containing a silicon element as a general flame retardant is also known, in the present invention, the flame retardant containing a silicon element is included in the above-mentioned " compound containing a silicon element ".

The reason why the flame retardancy is improved by containing the flame retardant containing no silicon element and the compound containing silicon element in such a coating layer is not clear, but the effect of the flame retardant containing no silicon element and the compound containing silicon is not satisfactory It is estimated that it is different.

The flame retardant agent containing no silicon element according to the present invention has the effect of promoting carbonization to block oxygen by burning and the effect of reducing the relative oxygen concentration required for combustion by generating an incombustible gas such as nitrogen, It is presumed that the flame retardancy is improved due to the effect of deactivating the energy required for combustion by vaporization of the incombustible gas and the effect of reducing the relative combustible concentration of the incombustible part because the incombustible material itself is incombustible.

Further, the compound containing the silicon element according to the present invention has a complex carbonized layer formed by the silicon element as a part of the bond skeleton when burned, so that the effect of blocking oxygen is improved, and when the silicon element is the "silicon element Containing flame retardant is contained in the coating layer, it is presumed that the flame retardancy is improved by the occurrence of a delay effect due to the improvement in the heat resistance of the coating layer due to the high binding energy between silicon and the other element.

The laminated film of the present invention is characterized in that the content (F) (mass%) of the flame retardant containing no silicon element and the content S (mass%) of the silicon element with respect to the mass of the whole coating layer are Satisfy the conditions (i) to (iii). When two or more coating layers are formed, the content ratio (F) and the content ratio (S) are contents with respect to the total mass of all the coating layers.

(i) F (mass%)? 30

(ii) S (mass%)? 0.03

(iii) F + S (mass%)? 60

The content ratio of either one of the flame retardant containing no silicon element, the compound containing no silicon element, the flame retardant containing no silicon element, or the silicon element of the compound containing silicon element (I) or (ii) is not satisfied), the effect of improving the flame retardancy of the laminated film is hardly obtained. Further, if the total content of the silicon element of the flame retardant containing no silicon element and the silicon element is too large (that is, the condition (iii) is not satisfied), adhesion between the coating layer and the substrate thermoplastic resin film is low Peeling occurs.

In the present invention, the content of the flame retardant containing no silicon compound needs to be 30% by mass or more (the above condition (i)) with respect to the entire coating layer. When the content is less than 30 mass%, the flame retardancy is not improved and the flame retardancy level equivalent to HBF, HB, V-2 specified in UL-94 may not be obtained. The content of such a flame retardant is more preferably 40% by mass or more. Although the upper limit is not particularly limited, if it exceeds 55% by mass, the adhesion between the coating layer and the substrate thermoplastic resin film may remarkably decrease, resulting in peeling, and inferior in moldability and productivity.

In the present invention, the content of the silicon element with respect to the mass of the entire coating layer is required to be 0.03 mass% or more (the above condition (ii)) with respect to the entire coating layer. If the content is less than 0.03 mass%, the flame retardancy is not improved and the flame retardancy level equivalent to HBF, HB, V-2 specified in UL-94 may not be obtained. The content of such a silicon element is more preferably 0.1 mass% or more, still more preferably 0.5 mass% or more, particularly preferably 3 mass% or more, and most preferably 5 mass% or more. The upper limit is not particularly limited, but if it is more than 10% by mass, the adhesion between the coating layer and the thermoplastic resin film of the substrate remarkably lowers and peeling may occur.

In the present invention, it is important that the coating layer contains a compound containing a silicon element. As described above, it is particularly preferable to use a compound containing a " silicon element " rather than a silicon element alone. The compound containing a silicon element according to the present invention is an organic silicon compound having a functional group or a molecular chain having a carbon skeleton in its molecular structure and an inorganic silicon compound having another inorganic element in its structure.

Such organosilicon compounds include low-molecular compounds such as organosilanes, organosilazanes, organosiloxanes and cyclic organosiloxanes, and straight-chain structures and branches such as siloxane oligomers, silicone oils, silicone rubbers, and silicone resins, which are polyorganosiloxanes Chain type or a silicone-based compound having a cyclic structure. The form of containing these compounds may be a method insoluble or non-insoluble in a resin forming a coating layer such as a particle or a method of dissolving in a liquid phase or a solvent to add a solid coating layer after the coating step good. In this sense, a silicone compound such as a siloxane oligomer, a silicone oil, a silicone rubber, a silicone resin, or a cyclic polyorganosiloxane, which is a polyorganosiloxane which is relatively easy to form a coating layer, can be more preferably used, May be a resin in a reactive functional group or a coating layer forming a bond with a resin in a coating layer by heat, ultraviolet rays, a catalyst or the like in order to avoid bleeding out from the coating layer, or a functional group having compatibility with an organic solvent used in the coating step A modified silicone compound having a molecular chain terminal, a molecular chain, a branched chain or the like in its structure, but is not limited thereto.

Examples of the functional group include straight chain alkyl groups, branched alkyl groups, cycloalkyl groups, alkenyl groups such as vinyl allyl hexenyl and the like, aryl groups such as phenyl · tolyl · xylyl · naphthyl · biphenyl, aralkyl groups such as benzyl · phenetyl, And other aromatic groups containing a heterocyclic ring such as imidazole, imidazole, imidazole, imidazole and the like, and aromatic groups thereof, alkoxy groups such as methoxy and ethoxy, acryl groups, methacrylic groups, acryloxy groups, methacryloxy groups, An epoxy group, an isocyanate group, a hydroxyl group, a carboxyl group, an amino group, and the like. Among these functional groups, when the resin in the coating layer has a functional group to be reacted such as a hydroxyl group, A functional group capable of undergoing reaction with the reactive functional group to form a bond, that is, an isocyanate group, a hydroxyl group, or an alkoxy group is preferable, and the resin in the coating layer, When it is desired to improve the compatibility with a solvent, a phenyl group or a methyl group is preferable. When it is desired to further improve the flame retardancy, a methacrylic group or an epoxy group which forms a crosslinked structure at the time of combustion can be preferably used. Depending on the characteristics, at least one kind may be arbitrarily selected and used, or two or more kinds may be mixed, and they are not particularly limited to these.

Specific examples of these organic silicon compounds include X-24-8300, X-24-8310, X-24-8311, KR5230 and KR5235 (manufactured by Shin-Etsu Chemical Co., Ltd.) ), Straight chain alkyl modified X-22-8004, X-22-8053, X-22-8114, X-22-8195, X-22-8296, X-24-798A (manufactured by Shin-Etsu Chemical Co., (Trade name, manufactured by Shin-Etsu Chemical Co., Ltd.), Z-6018 (manufactured by Toray Dow Corning Co., Ltd.), acrylic modified KR9706 (manufactured by Shin-Etsu Kagaku Kogyo K.K.), alkoxylated KR213 and KR9218 KR282 and KR271 (manufactured by Shin-Etsu Chemical Co., Ltd.), KR211, KR300, KR311 and KR212 (Shin-Etsu Chemical Kogyo K.K.), epoxy-modified ES1001N, ES1002T and ES1023 KR2420A, KR251 and KR500 (manufactured by Shin-Etsu Chemical Co., Ltd.) of straight silicone resin and KR1120A (manufactured by Shin-Etsu Chemical Industry Co., Ltd.) KR165, KR169, KR203 KF-880, X-22-3820W, X-22-3939A, KF-8008, and KF-868 amino-modified silicone oils, KF-410 (Shin-Etsu Chemical Co., Ltd.), KF-412, X-22-1660B-3 (manufactured by Shin-Etsu Kagaku Kogyo K.K.), aralkyl- Epoxy-modified KF-1001, X-22-2000, KF-105, X-22-163 series, X-22-173DX, X-22-9002 (produced by Shin-Etsu Chemical Co., X-22-2046, KF-102, X-22-169 series (manufactured by Shin-Etsu Chemical Co., Ltd.), X-22-4039 of hydroxyl- X-22-176F (manufactured by Shin-Etsu Chemical Co., Ltd.), diol-modified X-22-176F (manufactured by Shin-Etsu Chemical Co., Ltd.), KF- X-22-162C, X-22-162C, X-22-3710 (manufactured by Shin-Etsu Chemical Co., Ltd.), X-22-164 series of methacrylic modification, X-22-174DX, X-22-2475 Manufactured by Kakugo Kogyo Co., Ltd.), high fatty acid ester modification KF-910, X-22-715 (manufactured by Shin-Etsu Chemical Co., Ltd.), KF-3935 (manufactured by Shinetsu Kagaku Kogyo Co., Ltd.) 22-6266, KF-353, X-22 (manufactured by Shin-Etsu Chemical Co., Ltd.), amino- and methoxy-modified KF-862 and X-22-9192 X-22-1821 (manufactured by Shin-Etsu Chemical Co., Ltd.), polyether and long-chain alkyl and aralkyl-modified X-22- KF-1002, X-22 (manufactured by Shin-Etsu Chemical Co., Ltd.) modified with epoxy and polyether, KF- -4741 (manufactured by Shin-Etsu Chemical Co., Ltd.), epoxy and aralkyl-modified X-22-3000T (manufactured by Shin-Etsu Chemical), long-chain alkyl and aralkyl-modified X-22-1877 (Manufactured by Kakugo Kagyo Co., Ltd.), and the organosilane type isotope Orgatics SI-410, Orgatics SIC-330 and Orgatics SIC-434 (manufactured by Matsumoto Pile Chemicals) can be used. As the organic silicon compounds of the particles, KMP- 590, KMP-701, X-52-854, X-22-8084, X-22-8171 (manufactured by Shin-Etsu Chemical Co., Ltd.), Tosulfal series (manufactured by Nissho Sangyo Co., (Manufactured by Toray Dow Corning Co., Ltd.), and the like. At least one kind may be arbitrarily selected depending on the application and required characteristics, and two or more kinds may be mixed.

Examples of such inorganic silicon compounds include silica, glass beads, calcium silicate, sodium silicate, aluminum silicate, and zeolite containing silicon.

Specific examples of such inorganic silicon compounds include silica particles such as quarton (registered trademark) SP series (manufactured by FUSO KAGAKU KOGYO Co., Ltd.), silica microbead series (manufactured by Showa Kasei Kogyo Kogyo Co., Ltd.) (Manufactured by Fujishirishi Kagaku Co., Ltd.), and the glass beads include the UniBead series (manufactured by Unitika Co., Ltd.), and the calcium silicate includes PCM light series (Manufactured by Sekisui Plastics Co., Ltd.). However, at least one kind may be arbitrarily selected depending on the application and the required characteristics, and two or more kinds may be mixed.

In the present invention, at least one of the organosilicon compound and the inorganic silicon compound among the silicon-containing compounds may be arbitrarily selected and used, or two or more thereof may be mixed, and the present invention is not limited thereto.

In the coating layer according to the present invention, a catalyst may be added together with a compound containing various silicon elements within a range not hindering the effect of the present invention. When a compound containing a reactive silicon element is contained, the reaction proceeds efficiently or can be an initiator due to ultraviolet rays or the like. Examples of such catalysts include aluminum-based catalysts, zinc-based catalysts, and titanium-based catalysts.

The flame retardant containing no silicon element according to the present invention is a general material having an effect of improving flame retardancy by being contained in a coating layer among inorganic and organic materials not containing a silicon element in the molecular structure. Although a flame retardant containing a silicon element is generally known, in the case of a flame retardant containing no silicon element and a compound containing a silicon element as described above, the effect on the flame retardancy and the effect on the adhesion between the base thermoplastic resin film and the coating layer are different In the present invention, the flame retardant containing the silicon element is included in the " compound containing the silicon element ".

Among these, as the flame retardant containing no silicon element, at least one selected from the group consisting of a non-halogen flame retardant compound containing a phosphorus atom and / or a nitrogen atom, a metal and an inorganic metal compound is preferable. These flame retardants effectively reduce the oxygen-blocking effect of the carbonization during combustion, reduce the relative oxygen concentration required for combustion, and effectively generate non-flammable gases such as nitrogen, nitrogen oxides, and water that deactivate the energy required for combustion So that the flame retardancy can be improved. Such a metal is an inorganic metal compound, and the inorganic metal compound is a substance containing an elemental element of an inorganic metal and other elements in a molecular structure as described later.

Examples of the halogen-free flame retardant compound containing such phosphorus and / or nitrogen atoms include phosphoric acid derivative compounds such as phosphate, phosphinate, phosphine oxide and boron phosphate, tetrazole compounds, melamine compounds and / And a compound having a large amount of nitrogen in one molecule such as melamine cyanurate, melamine polyphosphate, ammonium polyphosphate, and phosphazene, or a compound containing both phosphorus and nitrogen is also preferable But the present invention is not limited thereto.

Specific examples of the non-halogen flame retardant compound containing these phosphorus atoms and / or nitrogen atoms include SP-703H, SP-670 (manufactured by Shikoku Kasei Kogyo Co., Ltd.), Exolit (registered trademark) OP550, Exolit Exolit TM OP910, Exolit TM OP912, Exolit TM OP921, Exolit TM OP930, Exolit TM OP935, Exolit TM OP1230, Exolit TM OP1312, Exolit TM (registered trademark) (Registered trademark) AP420, Exolit (registered trademark) AP722, Exolit (registered trademark) AP722, Exolit (registered trademark) AP423, Exolit (registered trademark) AP452, (Trade name) AP751, Exolit (registered trademark) AP752 (manufactured by Clariant Japan K.K.), PX-200, TPP (manufactured by Daihachi Kagaku Kogyo K.K.), Adekastab (registered trademark) (Trademark) FP-700, Adekastab (registered trademark) FP-2200 (made by ADEKA), SPB-100 (made by Otsuka Kagaku), polyphosphoric acid melamine PHOSMEL- (subject) , Ciba (registered trademark) MELAPUR (registered trademark) MC15 (manufactured by Ciba Specialty Chemicals), and the like.

Examples of the metal include aluminum, silver, gold, copper, iron, platinum, and zinc, and aluminum is preferable from the viewpoint of cost, but is not limited thereto.

The inorganic metal compound is a substance having an element different from that of the inorganic metal in the molecular structure. For example, if the other element is hydrogen or oxygen, inorganic metal hydroxide or inorganic metal oxide may be mentioned. Phosphorus or nitrogen contained in the halogen-based flame retardant, and other carbon or boron if it is a metal salt or a metal compound thereof, that is, a salt of a phosphoric acid derivative of an inorganic metal, a nitride of an inorganic metal, an ammonium salt of an inorganic metal, Carbonates, sulfates of inorganic metals, and the like. Examples of these inorganic metal compounds include inorganic metal hydroxides such as aluminum hydroxide, magnesium hydroxide, calcium hydroxide and calcium aluminate hydrate, alumina, zirconium oxide, zinc oxide, antimony trioxide, antimony pentoxide, magnesium oxide, titanium oxide, Inorganic metal oxides such as cobalt oxide, chromium oxide and talc; metal phosphates such as aluminum phosphonate, aluminum phosphinate, aluminum diphosphinate, magnesium phosphonate, magnesium phosphinate, magnesium diphosphinate, calcium phosphonate, calcium phosphinate, Calcium phosphate, calcium phosphate, and calcium phosphate-based hydroxyapatite; complexes of inorganic metals such as calcium carbonate, magnesium carbonate and zinc carbonate; inorganic metal salts such as barium sulfate and zinc sulfide; Sulfate, and the like. Specifically, for example, aluminum hydroxide Light (R) H-43H may be mentioned (Showa Denko (Inc.)) or the like, alumina as the like ALH (Kawai set chi Kogyo (Co., Ltd.)), but not particularly limited to these.

In the present invention, it is preferable to use an aluminum phosphonate, a phosphonate aluminum, a diphosphinic acid aluminum, a magnesium phosphonate, a magnesium phosphonate, , Magnesium phosphate, magnesium phosphosphate, magnesium diphosphinate, calcium phosphonate, calcium phosphinate, calcium diphosphate, and hydroxyapatite containing calcium phosphate as a main component, or a flame retardant of the complex Aluminum phosphonate, aluminum phosphinate, and aluminum diphosphinate which can increase the phosphorus content in one molecule when the inorganic metal ionizes and is more preferable. Most preferably it is aluminum phosphinate. Specific examples of the phosphates and composites of these inorganic metals include Exolit (registered trademark) OP930, Exolit (registered trademark) OP935, Exolit (registered trademark) OP1230, Exolit (registered trademark) OP1312 (Clariant Japan , Boronex, HAP (manufactured by Maruo Calcium Co., Ltd.), and the like can be used.

In the present invention, at least one of a flame retardant selected from a non-halogen flame retardant compound containing a phosphorus atom and / or a nitrogen atom and an inorganic metal or an inorganic metal compound may be arbitrarily selected and used, And is not particularly limited to these.

Examples of the resin component forming the coating layer according to the present invention include polyester resin such as polyethylene terephthalate and polyethylene naphthalate, polycarbonate resin, polyurethane resin, acrylic resin, methacrylic resin, epoxy resin, polyamide resin, polyimide A resin such as polyethylene, polypropylene resin, polystyrene resin, polyvinyl acetate resin, nylon resin, melamine resin and phenol resin may be used. These resins may be used alone or in combination of two or more kinds of copolymers and / or A mixture thereof may be used, or a crosslinked structure may be used depending on the use.

In the present invention, the form containing the flame retardant containing no silicon element and the silicon element in the coating layer is not particularly limited, and the conditions using the laminated film of the present invention, for example, heat, light, humidity If it is desired to prevent the flame retardant from bleeding out from the coating layer by, for example, a method of copolymerizing with the resin for forming the coating layer, etc. may be used.

In the present invention, when the coating layer is formed on at least one surface of the substrate thermoplastic resin film, it may be formed by any method. For example, a coating liquid containing a flame retardant containing no silicon element and a compound containing a silicon element may be applied by gravure coating, roll coating, spin coating, reverse coating, bar coating, screen coating, blade coating, (In-line coating) in the production of the base material thermoplastic resin film by using various coating methods such as spin coating and the like, or coating (off-line coating) on the base material thermoplastic resin film after completion of the crystal orientation. However, It is not.

The thickness of the coating layer according to the present invention depends on the containing state of the silicon element, the kind of the compound containing the flame retardant and the silicon element not containing the silicon element, the content of the flame retardant and the silicon element not containing the silicon element, The content ratio of the inorganic particles contained in the base thermoplastic resin film, and the like, and therefore, it is preferably not less than 2 탆. If it is less than 2 mu m, the flame retardancy can not be improved and the flame retardancy level equivalent to HBF, HB, V-2 specified in UL-94 may not be obtained. The thickness of the coating layer is more preferably 6 占 퐉 or more, and particularly preferably 10 占 퐉 or more. The thickness of the coating layer referred to herein is the total thickness of the coating layer containing a flame retardant containing no silicon compound and a compound containing a silicon element, and it is preferable that the coating layer has two or more layers on both surfaces of the substrate thermoplastic resin film It is the total thickness of these coating layers as a whole.

When the laminated film of the present invention is used as a backlight or a solar cell module, the base thermoplastic resin film may be deteriorated by a lamp such as a cold cathode tube or light from outside, in particular ultraviolet rays (for example, optical deterioration such as yellowing or Decomposition deterioration which is caused by low molecular weight, etc.), a flame retardant containing no silicon element or a resin forming a coating layer to be formed on the base thermoplastic resin film may contain an ultraviolet absorber and / or light stabilizer in a range that does not inhibit the effect of the present invention .

Such ultraviolet absorbers and photostabilizers are broadly divided into inorganic and organic systems. However, the type of ultraviolet absorber and light stabilizer is not particularly limited, and may be a method of mixing with the resin forming such a coating layer or the like. When it is desired to prevent it, for example, a method of copolymerizing with the resin forming the coating layer may be used.

As such inorganic ultraviolet absorbers, titanium oxide, zinc oxide, cerium oxide and the like are generally known. Among them, at least one kind selected from the group consisting of zinc oxide, titanium oxide and cerium oxide is not bleed out, Absorbing property, and photocatalytic activity. Such ultraviolet absorbers may be used in combination of several kinds as necessary. Among them, zinc oxide is most preferable in view of economical efficiency, ultraviolet ray absorbability, and photocatalytic activity. As such zinc oxide, FINEX-25LP, FINEX-50LP (manufactured by Sakaikagaku Kogyo Co., Ltd.) and the like can be used.

Examples of such organic ultraviolet absorbers include benzotriazole and benzophenone. In particular, benzotriazole can be preferably used because it contains nitrogen in the structure and therefore has a function as a flame retardant, but is not limited thereto. These ultraviolet absorbers only absorb ultraviolet rays and can not capture organic radicals generated by irradiation with ultraviolet rays, so that the base thermoplastic resin film may be deteriorated in succession by these radicals. In order to capture these radicals, a photostabilizer is preferably used in combination, and as such photostabilizer, a hindad amine (HALS) -based compound is preferably used.

Here, as a copolymerizable monomer for fixing the organic ultraviolet absorber and / or photostabilizer, vinyl monomers such as acrylic and styrene are highly versatile and economically preferable. Of these copolymerizable monomers, styrene-based vinyl monomers are easily yellowed because they have aromatic rings, and copolymerization with acrylic vinyl monomers is most preferred in view of light resistance.

Further, a resin obtained by substituting a reactive vinyl monomer for the benzotriazole with 2- (2'-hydroxy-5'-methacryloxyethylphenyl) -2H-benzotriazole (trade name: RUVA-93), Otsuka Kagaku (Manufactured by Nippon Shokubai Co., Ltd.) can be used, and a vinyl monomer in which a reactive vinyl monomer is substituted for a hindered amine compound is 4-methacryloyloxy-2,2,6,6-tetramethylpiperidine LA-82 "manufactured by ADEKA Corporation) can be used.

In the present invention, examples of the organic ultraviolet absorber include a resin containing an organic ultraviolet absorber such as benzotriazole or benzophenone, a resin obtained by copolymerizing a benzotriazole-based or benzophenone-based reactive monomer, a hindered amine (HALS) A resin containing and / or copolymerized with a light stabilizer such as a reactive monomer may be used within a range not hindering the effect of the present invention.

The organic ultraviolet absorbent resin containing a resin obtained by copolymerization of such a benzotriazole-based, benzophenone-based reactive monomer and a resin obtained by copolymerizing a hindered amine (HALS) -based reactive monomer therewith is preferably a thin layer and has a high ultraviolet absorbing effect Among them, benzotriazole is particularly preferable because it contains nitrogen in the structure and also has an action as a flame retardant.

These methods are described in detail in [0019] to [0039] of JP-A-2002-90515. Among them, a halos hybrid (registered trademark) (Nippon Shokubai Co., Ltd.) containing a copolymer of an acrylic monomer and an ultraviolet absorber as an active ingredient can be used.

When the base thermoplastic resin film according to the present invention is used as a reflective film of a backlight or a solar cell module, a higher visible light reflectance is preferable. For this purpose, a white thermoplastic resin film containing bubbles and / or emulsion particles therein is preferably used. These white thermoplastic resin films are not particularly limited, but polyolefin-based or polyester-based ones such as porous unoriented or biaxially oriented polypropylene film, porous unoriented or elongated polyethylene terephthalate film are preferably used as examples, A polyester system is preferably used from the viewpoint of property and productivity.

[0034] to [0057] of JP-A 8-262208, JP-A No. 2002-90515 [0007] to [0018] of JP-A No. 8-262208, and JP-A No. 2002-138150 (0008) to (0034) and the like. Among them, a porous white biaxially oriented polyethylene terephthalate film disclosed in Japanese Patent Application Laid-Open No. 2002-90515 is preferable as the base thermoplastic resin film according to the present invention for the reasons mentioned above.

More preferably, it is a porous white biaxially oriented polyethylene terephthalate film obtained by mixing and / or copolymerizing with polyethylene naphthalate from the viewpoints of heat resistance and reflectance. And most preferably a porous white biaxially oriented polyethylene terephthalate film containing inorganic particles for improving the flame retardancy of the white thermoplastic resin film itself.

The content of the inorganic particles contained in the base thermoplastic resin film is preferably 2% by mass or more, more preferably 7% by mass or more, and most preferably 30% by mass or more based on the total mass of the base thermoplastic resin film. In order to obtain the flame retardancy in the present invention, the content of the inorganic particles in the base thermoplastic resin film is not necessarily 2% by mass or more based on the total mass of the base thermoplastic resin film, and the flame retardant containing no silicon element and the silicon element (I), (ii) and (iii), the flame retardancy can be sufficiently improved. However, if the content of the inorganic particles contained in the base thermoplastic resin film is 2 mass% or more, the content of the silicon element of the flame retardant containing no silicon element or the compound containing silicon element is suppressed to obtain the required flame retardancy, Can be made thinner, which is advantageous in terms of productivity and cost.

The constitution of the base thermoplastic resin film according to the present invention may be appropriately selected depending on the intended use and the required properties, and is not particularly limited, but a single layer and / or a composite film of two or more layers having at least one layer structure is preferable , And it is preferable that at least one layer contains bubbles and / or inorganic particles.

An example of a single layer constitution (= one layer) is a base thermoplastic resin film of only a single layer of A layer, for example, and the layer A contains inorganic particles and / or bubbles. The content of the inorganic particles is preferably 2% by mass or more, more preferably 7% by mass or more, and most preferably 10% by mass or more based on the total mass of the base thermoplastic resin film. However, (I), (ii) and (iii), the coating layer is not particularly limited to these. An example of the two-layer structure is a base thermoplastic resin film having a two-layer structure composed of an A layer / a B layer obtained by laminating a B layer on the A layer, and the inorganic particles and / And the like. The content of the inorganic particles is preferably not less than 2% by mass, more preferably not less than 7% by mass, and most preferably not less than 30% by mass based on the total mass of the base thermoplastic resin film, (I), (ii) and (iii), and then the coating layer containing the compound containing the silicon element is applied to the coating layer in a sufficient amount. Further, as an example of the three-layer structure, a base thermoplastic resin film having a three-layer laminated structure in which three layers of layer A / layer B / layer A / layer B / layer B / layer C are laminated, And a layer in which inorganic particles and / or bubbles are contained in the layer. The content of the inorganic particles is preferably 2% by mass or more, more preferably 7% by mass or more, and still more preferably 30% by mass or more based on the total mass of the base thermoplastic resin film. (I), (ii) and (iii) are satisfied, a sufficient amount of the coating layer is not particularly limited to these. In the case of a three-layer structure, from the viewpoint of productivity, it is most preferable that the B layer is a layer containing bubbles.

The number average particle diameter of the inorganic fine particles contained in such a base thermoplastic resin film is preferably 0.3 to 2.0 占 퐉. Examples of such inorganic particles include calcium carbonate, magnesium carbonate, zinc carbonate, titanium oxide, zinc oxide, cerium oxide, magnesium oxide, barium sulfate, zinc sulfide, calcium phosphate, silica, alumina, mica, mica titanium, talc, clay, kaolin , Lithium fluoride, calcium fluoride and the like can be used.

In the case of the present invention, among these inorganic particles, calcium carbonate, barium sulfate and titanium oxide are most preferably used because they can obtain flame retardance and reflectance. Most preferably, such inorganic particles have a number average particle diameter of 0.3 to 2.0 占 퐉, a specific surface area of 15 to 75 m2 / g and an oil absorption amount of 15 to 40 ml / 100 g.

Next, a description will be given of a method for producing a three-layer white thermoplastic resin film in the above-mentioned thermoplastic resin film, but the present invention is not limited to this example.

First, polymethylpentene is added as an emergency polymer, and polyethylene glycol, polybutylene terephthalate and polytetramethylene glycol copolymer as low specific gravity additives are added to polyethylene terephthalate. Sufficiently mixed and dried, and fed to an extruder B heated to a temperature of 270 to 300 캜. Polyethylene terephthalate containing inorganic and / or organic additives such as barium sulfate (BaSO ₄ ), calcium carbonate (CaCO ₃ ) and titanium oxide (TiO ₂ ) is fed to the extruder A by a conventional method. Then, the polymer of the extruder B is placed in the inner layer (B layer) and the polymer of the extruder A is arranged in both surface layers (A layer) in the T die 3 layer structure, and the three layers of the A layer / B layer / do.

This melt-laminated sheet is closely cooled and solidified on a drum cooled at a drum surface temperature of 10 to 60 占 폚 by electrostatic force to obtain an unstretched film. The unstretched film is led to a roll group heated to 80 to 120 캜, longitudinally stretched 2.0 to 5.0 times in the longitudinal direction, and cooled by a roll group of 20 to 50 캜. Subsequently, both ends of the longitudinally stretched film are led to a tenter while being gripped by a clip, and transversely stretched in a direction perpendicular to the length in an atmosphere heated to 90 to 140 캜. In this case, the stretching magnification is preferably 2.5 to 4.5 times in both the longitudinal and transverse directions, but the area ratio (longitudinal stretching magnification x transverse stretching magnification) is preferably 9 to 16 times. That is, if the area magnification is less than 9 times, the whiteness of the resulting film becomes poor. On the other hand, if the area ratio exceeds 16 times, tearing tends to occur at the time of stretching, and the film-forming property tends to become defective. In order to impart planarity and dimensional stability to the biaxially stretched film, the film is thermally fixed at 150 to 230 캜 in a tenter, followed by uniformly slow cooling. After cooling to room temperature, the film is taken up by a winding machine, To obtain a base thermoplastic resin film.

As examples of such a base thermoplastic resin film, a white film having a single layer structure may be used. First, a white film such as Rumirror (registered trademark) E20 (manufactured by Toray), SY64, SY70 (Manufactured by Mitsubishi Jushi Co., Ltd.) or UXP (TM) (manufactured by Mitsubishi Jushi Co., Ltd.)) as the two-layer white film, And E6SL, E6SR, E6SQ, and Tetron (registered trademark) UX (manufactured by Teijin DuPont Film Co., Ltd.) as the white film having the three-layer structure. Examples of the white sheet other than these are Optilon ACR3000, ACR3020 (manufactured by DuPont), and MCPET (registered trademark) (manufactured by Furukawa Denki Kogyo Co., Ltd.).

Various additives can be added to the base thermoplastic resin film and the coating layer within a range not hindering the effect of the present invention. Examples of such additives include additives such as organic and / or inorganic fine particles, fluorescent whitening agents, crosslinking agents, heat stabilizers, oxidation stabilizers, organic lubricants, antistatic agents, nucleating agents, dyes, fillers, dispersants, It can be used in combination.

The laminated film of the present invention preferably has an absolute value of the difference between an average reflectance of a wavelength of 400 nm or more and 500 nm or less and an average reflectance of a wavelength of 400 nm or more and 700 nm or less, as measured from the surface on which the coating layer is formed, is 5.0% or less. When the absolute value of the difference in average reflectance is greater than 5.0%, the change in luminescence color tone becomes noticeable depending on the backlight when used for a backlight for a liquid crystal display, or when the backlight is used for a backlight equipped with an LED, The amount of light reflected from the LED in the blue region is reduced, and the color reproducibility unique to the LED is impaired or the brightness of the display is insufficient. In order to compensate for this, measures have been taken such as increasing the output of the LEDs in the blue region. As a result, heat may be generated or power consumption may be improved. The difference in average reflectance is more preferably 3.0% or less, further preferably 1.0% or less. As a method for setting the absolute value of the difference in average reflectance to 5.0% or less, for example, a method of excessively absorbing light in a specific wavelength region in a wavelength region of 400 nm or more and 500 nm or less or 400 nm or more and 700 nm or less, There is a method of minimizing the absolute amount of the reflective material in the applied layer. Particularly, since the ultraviolet absorber absorbs light in the ultraviolet region in a visible light region of a short wavelength depending on a substance, when the absolute amount of the ultraviolet absorber is extremely large, the absolute value of the difference in average reflectance sometimes becomes larger than 5.0%. It is necessary to appropriately adjust the flame retardancy and the extent of the deterioration of the base thermoplastic resin film.

The laminated film of the present invention preferably has an average reflectance of 85% or more, more preferably 87% or more, further preferably 90% or more, more preferably 90% or more, at a wavelength of 400 to 700 nm measured from the surface on which the coating layer is formed. Most preferably at least 95%. When the average reflectance is less than 85%, the luminance may be insufficient depending on the applied liquid crystal display. In the case where a coating layer is formed on both surfaces, the average reflectance measured from one coating layer should be 85% or more. As a method of setting the average reflectance at a wavelength of 400 to 700 nm to 85% or more, for example, there is a method of increasing the absolute amount of the interface for reflecting light in the substrate thermoplastic resin film or the coated surface. Particularly, a method of forming a void structure in the base white film described above more, or making the thickness of a portion having a void structure thicker can be mentioned.

The laminated film of the present invention preferably has a heat shrinkage rate of -0.1% to 0.2% both in the longitudinal direction and the width direction of the base thermoplastic resin film when measured at a heating temperature of 90 DEG C and a heating time of 30 minutes. More preferably, it is -0.05% or more and 0.15% or less. If the heat shrinkage is out of the range of -0.1% to 0.2%, the film tends to become warped when it reaches a high temperature. Particularly, in a backlight reflective film loaded with an LED, there are many cases where the backlight film is used at a high temperature, and the film is subjected to punching in accordance with the position where the LED is installed. It is likely to cause contact with the backlight and the like, and furthermore, there is a possibility that the characteristics and safety of the backlight are impaired.

The term " heat shrinkage rate in the longitudinal direction of the base thermoplastic resin film of the laminated film measured at a heating temperature of 90 DEG C and a heating time of 30 minutes in the present invention means that a sample of a laminated film having a constant size is prepared, (L ₀ ) was measured in the direction of extrusion during the production of the resin film, and the sample was kept in a thermostatic chamber kept at 90 캜 for 30 minutes. After cooling to the same room temperature, the length of the portion corresponding to L ₀ And is a numerical value calculated from the length L and the initial length L ₀ by the following equation (1).

Heat shrinkage percentage (%) = {(L ₀ -L) / L ₀ } × 100 (One)

A negative value indicates that the polymer film is elongated.

The heat shrinkage ratio in the width direction of the base thermoplastic resin film of the laminated film measured at a heating temperature of 90 占 폚 and a heating time of 30 minutes is the base thermoplastic resin film in the width direction (direction perpendicular to the extrusion direction in producing the base thermoplastic resin film) Refers to a value measured in the same manner as the longitudinal direction of the resin film.

As a method of setting the heat shrinkage ratio of the laminated film to -0.1% or more and 0.2% or less, for example, there is a method of performing heat treatment at the time of film formation of the base thermoplastic resin film or drying of the coating layer.

The thus obtained laminated film of the present invention can have flame retardancy levels equivalent to HBF, HB, and V-2 specified in UL-94. According to a more preferred embodiment, even if used for a long time, the reflectance decreases and the warp of the film is small. Therefore, the laminated film of the present invention can be preferably used for a reflector of an edge-lit backlight for a liquid crystal display, a direct-type backlight, and a reflector of a backlight equipped with an LED. In addition, it can be preferably used as a reflective film for various surface light sources and a sealing film or a back sheet of a solar cell module requiring reflection characteristics. In addition, there are various kinds of cards such as cards, labels, seals, courier slips, video printer receivers, inkjet printers, barcode printers, posters, maps, cardboard labels, whiteboards, thermal transfer, offset printing, , As a substrate of a receptacle sheet used for various printing records such as an IC card, a construction material such as a wallpaper, a lighting device used indoors and outdoors, an indirect lighting device, a member mounted on an automobile, a railroad, Can be used.

Example

Hereinafter, the present invention will be described in more detail with reference to examples, but the present invention is not limited to these examples. The measuring method and the evaluation method are shown below.

(1) Flame retardancy of the film

UL-94 < / RTI > If the evaluation result has a flame retardancy which is fairly suitable for HBF, HB, or V-2, it is acceptable.

(2) Content of flame retardant containing no silicon element in the coating layer

First, the sample is cut in 10 cm squares and the mass is measured. Subsequently, the coating layer is immersed in an organic solvent to peel off the coating layer, the mass of the sample is measured, and the mass of the whole coating layer is calculated. Further, the organic solvent after the coating layer is immersed is filtered, and the filtrate and the filtrate are separated, and then the mass of the filtrate is measured. Then, the presence or absence of silicon elements in the filtrate was examined using a wavelength dispersive X-ray fluorescence spectrometer.

When no silicon element is detected in the filtrate, the filtrate is first selected by a method which can be separated from general separation methods such as silica gel column chromatography, gel permeation chromatography, liquid high-speed chromatography and gas chromatography, Are separated and purified as a single substance, respectively. Then, each material was appropriately concentrated and diluted, and subjected to analysis by nuclear magnetic resonance spectroscopy ( ¹ H-NMR and ¹³ C-NMR), two-dimensional nuclear magnetic resonance spectroscopy (2D-NMR), infrared spectroscopy (IR) (Mass spectrometry), X-ray diffraction (XRD), neutron diffraction (ND), low speed electron diffraction (LEED), high speed reflection electron diffraction (RHEED), atomic absorption spectroscopy (AAS) , X-ray photoelectron spectroscopy (XPS), fluorescent X-ray element analysis (XRF), inductively coupled plasma emission spectroscopy (ICP-AES), electron beam microanalysis (EPMA), and other elemental analysis. . Thereafter, the total mass of the material corresponding to the flame retardant containing no silicon element is taken as the mass of the flame retardant containing no silicon element, and the value divided by the mass of the entire coating layer is calculated. Five measurements were made in the same manner, and the average value of the five locations was determined as " the content of the flame retardant containing no silicon element ".

When a silicon element was detected in the filtrate, the peak intensity of intrinsic X-ray of the silicon element was measured using a wavelength dispersive X-ray fluorescence spectrometer. Thereafter, a calibration curve of the peak intensity and the content was prepared using a standard substance having a concentration base or content ratio of the same composition as the substance containing the detected silicon element, and then the content of the silicon element in the value of the peak intensity of the obtained sample Was obtained from the calibration curve, and the concentration or content of the substance containing the silicon element was determined from the content of the silicon element. Next, the filtrate is separated and separated from common separation methods such as silica gel column chromatography, gel permeation chromatography, liquid high-speed chromatography and gas chromatography, and the filtrate is separated and purified as a single substance. Then, each material was appropriately concentrated and diluted and analyzed by nuclear magnetic resonance spectroscopy ( ¹ H-NMR, ¹³ C-NMR and ²⁹ Si-NMR), two-dimensional nuclear magnetic resonance spectroscopy (2D- IR, Mass, XRD, Neutron Diffraction (ND), Low Speed Electron Diffraction (LEED), High Speed Reflected Electron Diffraction (RHEED), Atomic Absorption Spectroscopy (AAS) Choose appropriate methods from electronic spectroscopy (UPS), X-ray photoelectron spectroscopy (XPS), fluorescent X-ray element analysis (XRF), inductively coupled plasma emission spectroscopy (ICP-AES), electron beam microanalysis (EPMA) And each single substance was identified in combination. Thereafter, a value obtained by dividing the total mass of the flame retardant containing no silicon element and other substances not corresponding to the silicon element-containing substance by the mass of the entire coating layer was calculated, and this was regarded as the content of other substances. Thereafter, a value obtained by dividing the mass of the filtrate by the mass of the entire coating layer was calculated, and this was regarded as the content of the filtrate. Then, the difference between the content of the filtrate and the total content was calculated by taking the sum of the contents of the other substances and the content of the substance containing the silicon element as the total content. Five measurements were made in the same manner, and the average value of the five locations was determined as " the content of the flame retardant containing no silicon element ".

(3) Content of silicon element in coating layer

First, the sample is cut in 10 cm squares and the mass is measured. Then, the coating layer is immersed in an organic solvent to peel off the coating layer, and the mass of the sample is measured, and the mass of the entire coating layer is calculated. Then, the organic solvent after immersing the coating layer was concentrated by evaporating an appropriate organic solvent, and then the peak intensity of intrinsic X-ray of the silicon element was measured using a wavelength dispersive X-ray fluorescence spectrometer. Thereafter, a calibration curve of the peak intensity and the content of the silicon element was prepared using a standard material, and the content of the silicon element was determined from the calibration curve from the peak intensity value of the obtained sample. Five measurements were made in the same manner, and the average value at five locations was defined as " content of silicon element ".

(4) Cohesion of Coating Layer

And was performed by a checkerboard tape method based on JIS K-5400 (1990). 100 sheets of squares were formed on the application surface at intervals of 1 mm on the application surface using a cutter knife or a cutter guide as specified and a specified cellophane tape was stuck on the cellophane tape and rubbed with an eraser from the top of the cellophane tape to remove non- In the direction of 90 degrees. In the present invention, the judgment standard is changed from JIS K-5400 (1990), and it is judged by counting the remaining number of checkered eyes in 100 mass eyes without peeling, Is most preferable.

Class A: More than 90 pieces of checkerboard snow

Class B: Number of checkerboards remaining 50 to less than 90

Class C: The number of remaining checkerboards is less than 50.

(5) Content of inorganic particles in the base thermoplastic resin film

First, the sample is cut at 10 cm square and the coating layer is peeled off by the method (2) to measure the mass, and the mass of the entire base material thermoplastic resin film is calculated. Then, after the resin is melted and evaporated at a high temperature of 900 DEG C or higher, the mass of the remaining inorganic particles is measured. The measurement was performed at five places in the same manner, and the value obtained by dividing the mass of the inorganic particles at the respective sites by the mass of the entire film was calculated. The average value of the five locations was defined as the "content ratio of the inorganic particles".

(6) Thickness of Coating Layer

The sample is cut in a direction perpendicular to the plane of the film at a knife inclination angle of 3 DEG by using a rotary microtome manufactured by Japan Microtome Co., The obtained cross section of the film was observed using a Topcon spectrophotometer type electron microscope ABT-32, and the total thickness of the coating layers laminated on the substrate thermoplastic resin film was measured at 10 points on each single surface and 10 surfaces on both surfaces, Thickness of the applied layer ".

(7) Light fastness (yellow unchanged)

Ultraviolet ray deterioration accelerating tester The IR ultraviolet ray irradiation test was conducted under the following conditions using an IR Super UV tester SUV-W131 (manufactured by Iwasaki DENKI CO., LTD.), And the value b was obtained. Three samples were subjected to an accelerated test, and b values before and after the test were measured, respectively. The average value of the differences was defined as light fastness (yellow non-change amount).

&Quot; UV irradiation conditions "

Illuminance: 100 mW / cm 2, temperature: 60 캜, relative humidity: 50% RH, irradiation time: 48 hours

The results of the light resistance evaluation are judged as follows. If A, B grade is acceptable, A grade is most preferable.

Class A: Less than 5 amber

B grade: Yellow amber less than 5 and less than 15

Class C: Yellow color change is over 15.

(8) Average reflectance

(Manufactured by Hitachi Seisakusho Co., Ltd.) and a 10 占 sloping spacer were attached to a spectrophotometer U-3410 (Hitachi, Ltd.) with a reflectance of 10 nm at a wavelength of 400-700 nm The average value was calculated. In the standard white plate, Hitachi Koko Cookie Service Part No. 210-0740 was used. An average value was calculated for five samples, and this was taken as an average reflectance.

(9) Heat shrinkage ratio

A sample is cut into a length of 10 mm wide × 230 mm long in the longitudinal direction and the width direction of the base material thermoplastic resin film, marks are formed at intervals of 200 mm in the longitudinal direction, and the distance between the marks is accurately read (αmm). After the sample was aged in a hot air oven at 90 DEG C for 30 minutes, the inter-mark distance of the sample was read (.beta.mm) in the above manner. The heat shrinkage ratio was calculated from the distance between the marks by the following formula and expressed in%.

Heat shrinkage percentage (%) = (? -?) /? 占 100.

The binder resin, the flame retardant, and the compound containing the silicon element used in each of the examples are shown below.

(1) Binder resin: benzotriazole-containing acrylic copolymer (Halc Hybrid (registered trademark) UV-G13 concentration 40% solution manufactured by Nihon Shokubai Co., Ltd.)

(2) Flame retardant containing no silicon element A: Aluminum phosphinate (Exolit (registered trademark) OP935, Clariant Japan Co., non-halogen flame retardant compound containing phosphorus)

(3) Flame-retardant agent containing no silicon element B: PHOSMEL-100 (manufactured by Nissan Kagaku Kogyo K.K., melamine polyphosphate, nonhalogen-based flame-retardant compound containing phosphorus atom and nitrogen atom)

(4) Flame retardant containing no silicon element C: Aluminum hydroxide (Heidite (registered trademark) H-43H manufactured by Showa Denko Co., Ltd., inorganic metal compound)

(5) Compound containing silicon element A: Polyester-modified polydimethylsiloxane (commercially available as a 25% concentration solution of X-24-8300 manufactured by Shin-Etsu Chemical Co., Ltd., binder resin)

(6) Compound containing silicon element B: Silicone resin particles (KMP-590, Shin-Etsu Chemical Co., Ltd., insoluble in binder resin)

(7) Compound containing silicon element C: Calcium silicate particles (insoluble in binder resin, Kawasetai Chemical Co., Ltd.).

(Example 1)

Binder resin: 10.000 g

Toluene: 27.51 g

Flame retardant agent containing no silicon element A: 4.302 g

Compound A containing silicon element: 1.208 g

Was added at 25 占 폚 with stirring to prepare a coating liquid. Thereafter, the mixture was stirred at 25 캜 for 30 minutes to prepare a coating liquid.

Layered thermoplastic resin film (Lamierer (registered trademark) E6SQ, thickness 300 占 퐉) made of porous biaxially stretched polyethylene terephthalate as a base thermoplastic resin film was prepared. The coating liquid was coated on both sides of the base material thermoplastic resin film using Barcoater's Number 35 made by Matsuo Sangyo Co., Ltd., and dried by heating at 120 캜 for 1 minute. The thickness after drying was 10.5 탆 for each side, Mu m of a coated layer was formed to obtain a laminated film of the present invention.

(Example 2)

A laminated film of the present invention was obtained in the same manner as in Example 1, except that the composition of the coating liquid was not more than 2%.

Binder resin: 10.000 g

Toluene: 28.216 g

Flame retardant A containing no silicon element: 4.277 g

Compound B containing silicon element: 0.277 g.

(Example 3)

A laminated film of the present invention was obtained in the same manner as in Example 1, except that the composition of the coating liquid was not more than 2%.

Binder resin: 10.000 g

Toluene: 27.529 g

Flame retardant A containing no silicon element: 4.281 g

Compound A containing silicon element: 1.124 g

Compound C containing silicon element: 0.031 g.

(Example 4)

A laminated film of the present invention was obtained in the same manner as in Example 1, except that the composition of the coating liquid was not more than 2%.

Binder resin: 10.000 g

Toluene: 27.51 g

Flame retardant A containing no silicon element: 3.872 g

Flame retardant agent B containing no silicon element: 0.430 g

Compound A containing silicon element: 1.208 g.

(Example 5)

A laminated film of the present invention was obtained in the same manner as in Example 1, except that the composition of the coating liquid was not more than 2%.

Binder resin: 10.000 g

Toluene: 27.51 g

Flame retardant A containing no silicon element: 3.872 g

Flame retardant agent containing no silicon element C: 0.430 g

Compound A containing silicon element: 1.208 g.

(Example 6)

Binder resin: 10.000 g

Toluene: 42.113 g

Flame retardant agent containing no silicon element A: 7.394 g

Compound A containing silicon element: 10.228 g

Was added at 25 占 폚 with stirring to prepare a coating liquid. Thereafter, the mixture was stirred at 25 캜 for 30 minutes to prepare a coating liquid.

Layered thermoplastic resin film (Lumirror (registered trademark) E6SR, thickness 225 占 퐉) composed of a porous biaxially stretched polyethylene terephthalate as a base thermoplastic resin film was prepared. The coating liquid was coated on both sides of the base material thermoplastic resin film using Barcoater Number 15 manufactured by Matsuo Sangyo Co., Ltd. and heated and dried at 120 占 폚 for 1 minute. The thickness after drying was 4.5 占 퐉 for each side, Mu m of the flame retardant coating layer was formed to obtain the thermoplastic resin film of the present invention.

(Example 7)

&Quot; Method of producing base thermoplastic resin film "

The raw polymer of the polyester A layer was mixed at the mixing ratios shown below and fed to an extruder A having an extrusion temperature of 290 deg.

Polyethylene terephthalate chip (F20S manufactured by Toray Industries, Inc., hereinafter abbreviated as PET): 47 mass%

A chip of an isophthalic acid copolymer mainly composed of polyethylene terephthalate (F51M manufactured by Toray Co., Ltd., hereinafter abbreviated as PET / I): 20 mass%

Barium sulfate having a number average particle diameter of 0.7 占 퐉: 35 mass%

On the other hand, the raw polymer of the polyester B layer was mixed at the mixing ratios shown below and fed to an extruder B having an extrusion temperature of 290 deg.

PET: 65 mass%

A copolymer of methylene glycol ("Hytrel" manufactured by DuPont-DuPont, hereinafter abbreviated as PBT / PTMG): 5 mass%

10% by mass of a copolymer (T794M made by TORAY CO., LTD., Hereinafter abbreviated as PET / I / PEG) obtained by copolymerizing 10 mol% of isophthalic acid and 5 mol% of polyethylene glycol in polyethylene terephthalate,

Polymethylpentene (polymethylpentene resin having an MFR of 230 g / 10 min, manufactured by Mitsui Chemicals, Inc., hereinafter abbreviated as PMP): 20 mass%

The sheet was formed into a sheet from a T-die through a laminating apparatus so that the thickness ratio of the A layer / the B layer / the A layer was 4: 92: 4.

The unstretched film, which was cooled and solidified by a cooling drum having a surface temperature of 25 占 폚, was led to a roll group heated to 85 to 98 占 폚, stretched 3.4 times in the machine direction in the longitudinal direction and cooled by a roll group of 25 占 폚. Subsequently, both ends of the longitudinally stretched film were led to a tenter while being gripped by a clip, and stretched 3.6 times in the direction perpendicular to the length in an atmosphere heated at 130 캜. Thereafter, heat setting at 230 DEG C was carried out in the tenter, and the mixture was uniformly cooled to room temperature, cooled and taken up to obtain a three-layered base thermoplastic resin film a (225 mu m thick) made of porous biaxially oriented polyethylene terephthalate . Table 1 shows the content of inorganic particles in the obtained base thermoplastic resin film " a " relative to the total mass of the base thermoplastic resin film.

&Quot; Method for producing laminated film "

Binder resin: 10.000 g

Toluene: 21.717 g

Flame retardant A containing no silicon element: 2.921 g

Compound A containing silicon element: 0.135 g

Was added at 25 占 폚 with stirring to prepare a coating liquid. Thereafter, the mixture was stirred at 25 캜 for 30 minutes to prepare a coating liquid.

This coating liquid was applied to both surfaces of the above-mentioned base thermoplastic resin film a using Barcoater Number 27 manufactured by Matsuo Sangyo Co., Ltd., and dried by heating at 120 캜 for 1 minute. The thickness after drying was 8 탆 for each side, 16 mu m thick was formed to obtain a laminated film of the present invention.

(Example 8)

(Tetron (registered trademark) film UX manufactured by Teijin DuPont Films Co., Ltd., thickness 225 탆) consisting of a porous biaxially stretched polyethylene terephthalate was prepared as the base thermoplastic resin film. The coating liquid having the same composition as in Example 7 was coated on both sides of the base material thermoplastic resin film using Barcoater's Number 20 made by Matsuo Sangyo Kogyo Co., and dried by heating at 120 占 폚 for 1 minute, Mu m and a total thickness of both sides of 12 mu m was formed to obtain a laminated film of the present invention.

(Example 9)

&Quot; Method of producing base thermoplastic resin film "

The raw polymer of the polyester A layer was mixed at the mixing ratios shown below and fed to an extruder A having an extrusion temperature of 290 deg.

Polyethylene terephthalate chip (F20S manufactured by Toray Industries, Inc., hereinafter abbreviated as PET): 47 mass%

A chip of an isophthalic acid copolymer mainly composed of polyethylene terephthalate (F51M manufactured by Toray Co., Ltd., hereinafter abbreviated as PET / I): 20 mass%

Barium sulfate having a number average particle diameter of 0.7 탆: 35% by mass.

On the other hand, the raw polymer of the polyester B layer was mixed at the mixing ratios shown below and fed to an extruder B having an extrusion temperature of 290 deg.

PET: 65 mass%

A copolymer of methylene glycol ("Hytrel" manufactured by DuPont-DuPont, hereinafter abbreviated as PBT / PTMG): 5 mass%

10% by mass of a copolymer (T794M made by TORAY CO., LTD., Hereinafter abbreviated as PET / I / PEG) obtained by copolymerizing 10 mol% of isophthalic acid and 5 mol% of polyethylene glycol in polyethylene terephthalate,

Polymethylpentene (polymethylpentene resin having an MFR of 230 g / 10 min, manufactured by Mitsui Chemicals, Inc., hereinafter abbreviated as PMP): 20 mass%

The sheet was formed into a sheet from a T-die through a laminating apparatus so that the thickness ratio of the A layer / B layer was 8:92.

The unstretched film obtained by cooling and solidifying the film with a cooling drum having a surface temperature of 25 占 폚 was led to a roll group heated to 85 to 98 占 폚 and longitudinally stretched 3.4 times in the longitudinal direction and cooled by a roll group of 25 占 폚. Subsequently, both ends of the longitudinally stretched film were led to a tenter while being gripped by a clip, and stretched 3.6 times in the direction perpendicular to the length in an atmosphere heated at 130 캜. Thereafter, heat setting at 230 占 폚 was carried out in the tenter, and the mixture was uniformly cooled to room temperature to obtain a two-layered substrate thermoplastic resin film b made of porous biaxially oriented polyethylene terephthalate having a thickness of 225 占 퐉. Table 1 shows the content ratios of the inorganic particles to the total mass of the base thermoplastic resin film in the obtained base thermoplastic resin film b.

&Quot; Method for producing laminated film "

The coating liquid having the same composition as in Example 7 was applied to both surfaces of the above-mentioned thermoplastic resin film b using Barcoater Number 27 manufactured by Matsuo Sangyo Co., Ltd., and dried by heating at 120 ° C for 1 minute, 8 占 퐉 and a total thickness of both sides of 16 占 퐉 was formed to obtain a laminated film of the present invention.

(Example 10)

Binder resin: 10.000 g

Toluene: 17.920 g

Flame retardant A containing no silicon element: 1.975 g

Compound A containing silicon element: 0.020 g

Was added at 25 占 폚 with stirring to prepare a coating liquid. Thereafter, the mixture was stirred at 25 캜 for 30 minutes to prepare a coating liquid.

As a base thermoplastic resin film, a thermoplastic resin film (TETRON (TM) film UXZ1 made by Teijin DuPont Films Ltd.) having a thickness of 225 탆 and made of porous biaxially oriented polyethylene terephthalate was prepared. The above coating liquid was coated on both sides of the base material thermoplastic resin film using Barcoater Number 7 made by Matsuo Sangyo Co., Ltd. and heated and dried at 120 占 폚 for 1 minute. The thickness after drying was 2 占 퐉 for each side, Mu m of a coated layer was formed to obtain a laminated film of the present invention.

(Example 11)

Binder resin: 10.000 g

Toluene: 32.809 g

Flame retardant A containing no silicon element: 5.486 g

Compound A containing silicon element: 3.460 g

Was added at 25 占 폚 with stirring to prepare a coating liquid. Thereafter, the mixture was stirred at 25 캜 for 30 minutes to prepare a coating liquid.

(TETRON (TM) film UXZ1 made by Teijin DuPont Films Co., Ltd., thickness 225 占 퐉) made of porous biaxially stretched polyethylene terephthalate was prepared as the base thermoplastic resin film. The above coating liquid was coated on both sides of the base material thermoplastic resin film using Barcoater's Number 20 made by Matsuo Sangyo Co., Ltd. and heated and dried at 120 占 폚 for 1 minute. The thickness after drying was 6 占 퐉 for each side, Mu m of a coated layer was formed to obtain a laminated film of the present invention.

(Example 12)

Binder resin: 10.000 g

Toluene: 37.207 g

Flame retardant agent containing no silicon element A: 6.386 g

Compound A containing silicon element: 6.652 g

Was added at 25 占 폚 with stirring to prepare a coating liquid. Thereafter, the mixture was stirred at 25 캜 for 30 minutes to prepare a coating liquid.

Layer thermoplastic resin film (Lumirror (registered trademark) E20, thickness 250 占 퐉) made of biaxially stretched polyethylene terephthalate containing titanium oxide as a base thermoplastic resin film was prepared. The coating liquid was coated on both sides of the base material thermoplastic resin film using Barcoater Number 15 manufactured by Matsuo Sangyo Co., Ltd. and heated and dried at 120 占 폚 for 1 minute. The thickness after drying was 4.5 占 퐉 for each side, Mu m of a coated layer was formed to obtain a laminated film of the present invention.

(Example 13)

Binder resin: 10.000 g

Toluene: 42.133 g

Flame retardant agent containing no silicon element A: 7.394 g

Compound A containing silicon element: 10.228 g

Was added at 25 占 폚 with stirring to prepare a coating liquid. Thereafter, the mixture was stirred at 25 캜 for 30 minutes to prepare a coating liquid.

As a base thermoplastic resin film, a one-layer thermoplastic resin film (made by SKC, SY64, thickness 225 占 퐉) containing titanium oxide and having a porous polyethylene terephthalate was prepared. The coating liquid was coated on one surface of the base material thermoplastic resin film using Barcoater's Number 40 made by Matsuo Sangyo Co., Ltd. and heated and dried at 120 占 폚 for 1 minute to form a coated layer having a thickness of 12 占 퐉 after drying To obtain a laminated film of the invention.

(Example 14)

Binder resin: 10.000 g

Toluene: 42.133 g

Flame retardant agent containing no silicon element A: 7.394 g

Compound A containing silicon element: 10.228 g

Was added at 25 占 폚 with stirring to prepare a coating liquid. Thereafter, the mixture was stirred at 25 캜 for 30 minutes to prepare a coating liquid.

Layered thermoplastic resin film (PLP230 made by Mitsubishi Jushi Co., Ltd., thickness 230 占 퐉) made of a titanium oxide-containing aliphatic polyester-based resin was prepared as the base thermoplastic resin film. The coating liquid was coated on both sides of the base material thermoplastic resin film using Barcoater's Number 35 made by Matsuo Sangyo Co., Ltd., and dried by heating at 120 캜 for 1 minute. The thickness after drying was 10.5 탆 for each side, Mu m of a coated layer was formed to obtain a laminated film of the present invention.

(Example 15)

Binder resin: 10.000 g

Toluene: 42.133 g

Flame retardant agent containing no silicon element A: 7.394 g

Compound A containing silicon element: 10.228 g

Was added at 25 占 폚 with stirring to prepare a coating liquid. Thereafter, the mixture was stirred at 25 캜 for 30 minutes to prepare a coating liquid.

Layered thermoplastic resin film (Optilon ACR3020, manufactured by DuPont) having a thickness of 386 mu m and composed of a composite of a polyethylene-based resin nonwoven fabric containing no inorganic particles and a polyester resin as a base thermoplastic resin film was prepared. The coating liquid was coated on both sides of the substrate thermoplastic resin film using Barcoater's Number 80 made by Matsuo Sangyo Co., Ltd., and dried by heating at 120 占 폚 for 1 minute. The thickness after drying was 24 占 퐉 for each side, Mu m of a coated layer was formed to obtain a laminated film of the present invention.

(Comparative Example 1)

Layered thermoplastic resin film (Jerumer (registered trademark) E6SQ, thickness 300 占 퐉) composed of porous biaxially stretched polyethylene terephthalate as a base thermoplastic resin film was prepared. No coating layer was formed on this base thermoplastic resin film.

(Comparative Example 2)

(Tetron (registered trademark) film UX manufactured by Teijin DuPont Films Co., Ltd., thickness 225 탆) composed of a porous biaxially stretched polyethylene terephthalate as a base thermoplastic resin film was prepared. No coating layer was formed on this base thermoplastic resin film.

(Comparative Example 3)

Layered thermoplastic resin film (PLP230 made by Mitsubishi Jushi Co., Ltd., thickness 230 占 퐉) made of a titanium oxide-containing aliphatic polyester-based resin was prepared as the base thermoplastic resin film. No coating layer was formed on this base thermoplastic resin film.

(Comparative Example 4)

Layered thermoplastic resin film (Optilon ACR3020, manufactured by DuPont) having a thickness of 386 mu m and composed of a composite of a polyethylene-based resin nonwoven fabric containing no inorganic particles and a polyester resin as a base thermoplastic resin film was prepared. No coating layer was formed on this base thermoplastic resin film.

(Comparative Example 5)

Binder resin: 10.000 g

Toluene: 10.000 g

Was added with stirring at 25 占 폚 to prepare a coating solution having no flame retardant containing no silicon element and no compound containing silicon element. Thereafter, the mixture was stirred at 25 캜 for 30 minutes to prepare a coating liquid.

Layer thermoplastic resin film (Lumirror (registered trademark) E20, thickness 250 占 퐉) made of biaxially stretched polyethylene terephthalate containing titanium oxide as a base thermoplastic resin film was prepared. The above coating liquid was coated on both sides of the base material thermoplastic resin film using Barcoater's Number 80 made by Matsuo Sangyo Co., Ltd. and heated and dried at 120 占 폚 for 1 minute. The thickness after drying was 24 占 퐉 for each side, Mu] m to form a laminated film.

(Comparative Example 6)

Binder resin: 10.000 g

Toluene: 39.593 g

Flame retardant A containing no silicon element: 1.064 g

Compound A containing silicon element: 0.011 g

Was added at 25 占 폚 with stirring to prepare a coating liquid. Thereafter, the mixture was stirred at 25 캜 for 30 minutes to prepare a coating liquid.

Layered thermoplastic resin film (Lamierer (registered trademark) E6SQ, thickness 300 占 퐉) made of porous biaxially stretched polyethylene terephthalate as a base thermoplastic resin film was prepared. The above coating liquid was coated on both sides of the base material thermoplastic resin film using Barcoater Number 5 made by Matsuo Sangyo Co., Ltd., and then heated and dried at 120 占 폚 for 1 minute. The thickness after drying was 0.75 占 퐉 for each side, 1.5 Mu m to form a laminated film.

(Comparative Example 7)

Binder resin: 10.000 g

Toluene: 30.393 g

Flame retardant agent containing no silicon element A: 5.097 g

Compound A containing silicon element: 0.020 g

Was added at 25 占 폚 with stirring to prepare a coating liquid. Thereafter, the mixture was stirred at 25 캜 for 30 minutes to prepare a coating liquid.

Layered thermoplastic resin film (Lumirror (registered trademark) E6SQ, thickness 300 占 퐉) made of porous biaxially stretched polyethylene terephthalate as a base thermoplastic resin film was prepared. The above coating liquid was coated on both sides of the base material thermoplastic resin film using Barcoater Number 7 made by Matsuo Sangyo Co., Ltd. and heated and dried at 120 占 폚 for 1 minute. The thickness after drying was 2 占 퐉 for each side, Mu m to form a laminated film.

(Comparative Example 8)

Binder resin: 10.000 g

Toluene: 20.735 g

Flame retardant A containing no silicon element: 2.105 g

Compound A containing silicon element: 9.260 g

Was added at 25 占 폚 with stirring to prepare a coating liquid. Thereafter, the mixture was stirred at 25 캜 for 30 minutes to prepare a coating liquid.

Layered thermoplastic resin film (Lumirror (registered trademark) E6SQ, thickness 300 占 퐉) made of porous biaxially stretched polyethylene terephthalate as a base thermoplastic resin film was prepared. The above coating liquid was coated on both sides of the base material thermoplastic resin film using Barcoater Number 7 made by Matsuo Sangyo Co., Ltd. and heated and dried at 120 占 폚 for 1 minute. The thickness after drying was 2 占 퐉 for each side, Mu m to form a laminated film.

(Comparative Example 9)

Binder resin: 10.000 g

Toluene: 70.942 g

Flame retardant A containing no silicon element: 13.570 g

Compound A containing silicon element: 26.648 g

Was added at 25 占 폚 with stirring to prepare a coating liquid. Thereafter, the mixture was stirred at 25 캜 for 30 minutes to prepare a coating liquid.

Layered thermoplastic resin film (Lumirror (registered trademark) E6SQ, thickness 300 占 퐉) made of porous biaxially stretched polyethylene terephthalate as a base thermoplastic resin film was prepared. The above coating liquid was coated on both sides of the base material thermoplastic resin film using Barcoater Number 27 made by Matsuo Sangyo Co., Ltd., and then heated and dried at 120 占 폚 for 1 minute. The thickness after drying was 8 占 퐉 for each side, Mu m of the flame retardant coating layer was formed to obtain a laminated film.

All of the laminated films of the present invention of Examples 1 to 15 were flame retardant and adherent. When the thickness of the coating layer was sufficient and the content of the inorganic particles in the base thermoplastic resin film was high, the flame retardancy was particularly good (Examples 8 and 11). (Example 1), insoluble spherical state (Example 2), mixed state (Example 3), etc.) of the compound contained in the coating layer , The flame retardancy could be imparted after the adhesion of the coating layer was sufficiently maintained even in the case where the kind of the flame retardant was different (Examples 1 to 5). If the content of the inorganic particles in the base thermoplastic resin film is high, the base thermoplastic resin film may have any layer structure, and even if only one surface forms the coating layer, The content ratio could be lowered or the thickness of the flame retardant coating layer could be reduced (Examples 7, 9, 10, 12, 13).

On the other hand, when the content of the flame retardant and the silicon element in the coating layer was increased (Example 6), sufficient flame retardancy could be imparted even if the thickness of the flame retardant coating layer was made thin. In addition, (Example 15) or when the resin constituting the base thermoplastic resin film is liable to be burned (Example 14), the content ratio of the flame retardant containing no silicon element and the silicon element in the coating layer is increased and the thickness of the coating layer is made thick The flame retardancy could be imparted, but the adhesion of the coating layer was inferior.

When the coating layer was not formed, the flame retardancy and the light resistance were not improved or the flame retardancy was not improved (Comparative Examples 1, 3 and 4). When the content of the inorganic particles in the base thermoplastic resin film was increased instead of forming the coating layer, the flame retardancy was acceptable but the heat shrinkage ratio was poor (Comparative Example 2). Even when the coating layer is formed, the flame retardant does not contain the silicon compound-containing flame retardant and the compound containing the silicon element and instead the thickness of the coating layer is extremely large, the flame retardancy is acceptable, but the difference in average reflectance is remarkably large 5)

When the content of the flame retardant and the silicon element was extremely low, the coating layer was extremely thin, and the content of the inorganic particles in the base thermoplastic resin film was extremely low even when the coating layer was formed, the flame retardancy was unsatisfactory (Comparative Example 6) . Further, even when the coating layer was formed, when the content ratio of either the flame retardant or the silicon element containing no silicon element was extremely low, the flame retardancy was not improved even when the content ratio of the other one was extremely large, , 8). In addition, when the content ratio of the flame retardant containing silicon element and the silicon element in the coating layer was large, the adhesion of the coating layer was extremely lowered (Comparative Example 9).

1: laminated film 2: base material composed of three layers thermoplastic resin film
3: a coating layer containing a flame retardant containing no silicon element and a compound containing a silicon element
4: layer containing inorganic particles and / or bubbles

Claims (7)

A flame retardant composition comprising at least one coating layer containing a flame retardant containing no silicon element and a compound containing a silicon element on at least one side of a base thermoplastic resin film and containing a silicon element with respect to the mass of the entire coating layer Wherein the content (F) (% by mass) of the coating layer and the content (S) (mass%) of the silicon element with respect to the mass of the entire coating layer satisfy the following conditions (i) to (iii).
(i) F (mass%)? 30
(ii) S (mass%)? 0.03
(iii) F + S (mass%)? 60 The method according to claim 1,
Wherein the flame retardant is at least one selected from the group consisting of a non-halogen flame retardant compound containing at least one of a phosphorus atom and a nitrogen atom, an inorganic metal and an inorganic metal compound. 3. The method according to claim 1 or 2,
Wherein the base thermoplastic resin film contains 2 mass% or more of inorganic particles with respect to the total mass of the base thermoplastic resin film. 3. The method according to claim 1 or 2,
Wherein the base thermoplastic resin film is a white film. A lamp reflector for a backlight, comprising the laminated film according to claim 1 or 2. A backlight comprising the laminated film according to claim 1 or 2. The method according to claim 6,
Wherein the light source of the backlight is a light emitting diode.

Images