Fire-retardant insulation sheet and electric / electronic apparatus

Abstract

To provide a fire-retardant insulation sheet capable of preventing adhesion when stacked up and stored and an electric / electronic apparatus utilizing the fire-retardant insulation sheet.SOLUTION: A fire-retardant insulation sheet includes a polycarbonate resin and a fire-retarder. The fire-retarder is composed of an organic sulfonic acid salt. An arithmetic average curvature (Spc) at a summit point on at least one surface of the fire-retardant insulation sheet is 200 (1 / mm) or more, a summit point density (Spd) is 8000 (1 / mm2) or more, or 60° glossiness is 25 or less. An electric / electronic apparatus utilizes the fire-retardant insulation sheet.SELECTED DRAWING: None

Description

[Technical field]

[0001] The present invention relates to a flame-retardant insulating sheet and an electric / electronic device. [Background technology]

[0002] Conventionally, flame retardancy has been imparted to resin molded articles by blending a flame retardant with a thermoplastic resin. For example, in order to improve the flame retardancy of polycarbonate resin, a method of blending a large amount of an oligomer or polymer of a carbonate derivative of brominated bisphenol A has been used.

[0003] However, in order to improve the flame retardancy of polycarbonate resin, it is necessary to blend a large amount of an oligomer or polymer of a carbonate derivative of brominated bisphenol A, which causes problems such as a decrease in impact resistance of the molded product and a tendency to crack. In addition, since a large amount of a halogen-based compound containing bromine is blended, there are many problems such as the generation of halogen-containing gas during combustion, which generates halogenated gas that is harmful to the human body. Therefore, there is a demand for a flame-retardant resin composition using a flame retardant that does not generate halogen-containing gas.

[0004] As flame retardants, in addition to those containing bromine, ammonium polyphosphate, phosphate ester compounds, etc. are known. However, when ammonium polyphosphate is used, the heat resistance and flame retardancy of the molded body become insufficient, and when a phosphate ester compound is used, a large amount of the compound must be used to impart flame retardancy to the molded body, resulting in a problem that the heat resistance and mechanical properties of the molded body become insufficient.

[0005] As a solution to such problems, a thermoplastic resin composition containing a cyclic phosphorus compound and a cellulose resin, and a film-shaped molded product obtained by molding the composition have been disclosed. The cyclic phosphorus compound is said to not only act as a flame retardant, but also contribute to improving the moldability, heat resistance, bending strength, etc. of the film-shaped molded product (see Patent Document 1). [Prior art documents] [Patent documents]

[0006] [Patent Document 1] JP 2012-052006 A Summary of the Invention [Problem to be solved by the invention]

[0007] Flame-retardant insulating sheets have various uses. For example, in electrical and electronic equipment, flame-retardant insulating sheets are sandwiched between circuit boards to prevent short circuits between the circuit boards. Such flame-retardant insulating sheets are often stored in a stacked state, such as being rolled up before use when they are long, or being stacked in the thickness direction before use when they are not long. In the case of resin sheets, there was a problem that they were prone to sticking when stored in a stacked state like this, which deteriorated handling, and flame-retardant insulating sheets also have the same problem. In contrast, conventional flame-retardant insulating sheets, including the film-shaped molded body disclosed in Patent Document 1, do not aim to solve such problems.

[0008] An object of the present invention is to provide a flame-retardant insulating sheet that can prevent sticking when stacked and stored, and an electric / electronic device using the flame-retardant insulating sheet. [Means for solving the problem]

[0009] The present invention employs the following configuration. [1] A flame-retardant insulating sheet comprising a polycarbonate resin and a flame retardant, the flame retardant being comprised of an organic sulfonate, and at least one surface of the flame-retardant insulating sheet having an arithmetic mean curvature (Spc) of a peak of 200 (1 / mm) or more. [2] A flame-retardant insulating sheet, comprising a polycarbonate resin and a flame retardant, the flame retardant being made of an organic sulfonate, and having a peak density (Spd) of 8000 (1 / mm) or more on at least one surface of the flame-retardant insulating sheet. 2 ) or more. [3] A flame-retardant insulating sheet comprising a polycarbonate resin and a flame retardant, the flame retardant being comprised of an organic sulfonate, and having a 60° gloss of 25 or less on at least one surface of the flame-retardant insulating sheet. [4] The flame-retardant insulation sheet according to [1] or [2], wherein the 60° gloss of the surface is 25 or less.

[0010] [5] The flame-retardant insulating sheet according to any one of [1] to [4], further comprising a colorant. [6] The flame-retardant insulation sheet according to [5], wherein the coloring material is carbon black. [7] The flame-retardant insulating sheet according to any one of [1] to [6], wherein the polycarbonate resin has a weight average molecular weight of 15,000 to 35,000. [8] The flame-retardant insulating sheet according to any one of [1] to [7], wherein the ratio of the content of the flame retardant to the content of the polycarbonate resin in the flame-retardant insulating sheet is 0.3 to 8 mass %. [9] An electric / electronic device using the flame-retardant insulating sheet according to any one of [1] to [8]. Effect of the Invention

[0011] According to the present invention, there are provided a flame-retardant insulating sheet that can suppress sticking when stored in a stacked state, and an electric / electronic device using the flame-retardant insulating sheet. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0012] <<Flame-retardant insulation sheet>> <Flame-retardant insulation sheet (1)> A flame-retardant insulating sheet according to one embodiment of the present invention contains a polycarbonate resin and a flame retardant, the flame retardant being made of an organic sulfonate, and at least one surface of the flame-retardant insulating sheet has an arithmetic mean peak curvature (Spc) of 200 (1 / mm) or more (in this specification, this flame-retardant insulating sheet may be referred to as “flame-retardant insulating sheet (1)”). "Mean peak curvature (Spc)" means the average of the principal curvatures of the peaks of a surface. A small Spc indicates that the points of contact with other objects are rounded, while a large Spc indicates that the points of contact with other objects are sharp. The flame-retardant insulating sheet of this embodiment (flame-retardant insulating sheet (1)) has flame retardancy and insulating properties, and is therefore suitable as a flame-retardant insulating sheet to be provided between circuit boards in electric and electronic devices. Since the flame-retardant insulating sheet (1) has an Spc of 200 (1 / mm) or more on at least one surface thereof, the point of contact with other objects becomes sharp, and therefore sticking is suppressed when the flame-retardant insulating sheet (1) is stacked and stored. For example, sticking of the flame-retardant insulating sheet (1) is suppressed in both cases where a long flame-retardant insulating sheet (1) is wound in a roll and stored, and where non-long flame-retardant insulating sheets (1) are stacked in the thickness direction and stored.

[0013] The flame-retardant insulating sheet (1) can be produced using a flame-retardant resin composition containing the polycarbonate resin and a flame retardant (sometimes referred to herein as "flame-retardant resin composition (1)").

[0014] [Polycarbonate resin] The flame-retardant insulating sheet (1) contains the polycarbonate resin and thus has excellent bending workability, punching workability, heat resistance and insulating properties.

[0015] The polycarbonate resin contained in the flame-retardant insulating sheet (1) and the flame-retardant resin composition (1) can be obtained, for example, by a phosgene method in which a dihydroxydiaryl compound is reacted with phosgene, or by a transesterification method in which a dihydroxydiaryl compound is reacted with a carbonate ester such as diphenyl carbonate.

[0016] In the flame-retardant insulating sheet (1) and the flame-retardant resin composition (1), examples of the dihydroxydiaryl compound include bis(hydroxyaryl)alkanes such as bisphenol A, bis(4-hydroxyphenyl)methane, 1,1-bis(4-hydroxyphenyl)ethane, 2,2-bis(4-hydroxyphenyl)butane, 2,2-bis(4-hydroxyphenyl)octane, bis(4-hydroxyphenyl)phenylmethane, 2,2-bis(4-hydroxyphenyl-3-methylphenyl)propane, and 1,1-bis(4-hydroxy-3-tert-butylphenyl)propane; 1,1-bis(4-hydroxyphenyl)cyclopentane, and 1,1-bis(4-hydroxyphenyl)cyclohexane. dihydroxydiaryl ethers such as 4,4'-dihydroxydiphenyl ether and 4,4'-dihydroxy-3,3'-dimethyldiphenyl ether; dihydroxydiaryl sulfides such as 4,4'-dihydroxydiphenyl sulfide and 4,4'-dihydroxy-3,3'-dimethyldiphenyl sulfide; dihydroxydiaryl sulfoxides such as 4,4'-dihydroxydiphenyl sulfoxide and 4,4'-dihydroxy-3,3'-dimethyldiphenyl sulfoxide; and dihydroxydiaryl sulfones such as 4,4'-dihydroxydiphenyl sulfone and 4,4'-dihydroxy-3,3'-dimethyldiphenyl sulfone.

[0017] In the flame-retardant insulating sheet (1) and the flame-retardant resin composition (1), the dihydroxydiaryl compound may be used alone or in combination of two or more kinds. When two or more kinds are used in combination, the combination and ratio thereof can be selected arbitrarily.

[0018] In the flame-retardant insulating sheet (1) and the flame-retardant resin composition (1), the weight-average molecular weight (Mw) of the polycarbonate resin is not particularly limited. The weight-average molecular weight is, for example, preferably 15,000 to 35,000, more preferably 20,000 to 35,000, and even more preferably 20,000 to 30,000. When the weight-average molecular weight is in such a range, the variation in thickness of the flame-retardant insulating sheet (1) becomes smaller.

[0019] In this specification, the term "weight average molecular weight", not limited to the case of polycarbonate resin, unless otherwise specified, is a polystyrene-equivalent value measured by gel permeation chromatography (GPC).

[0020] When producing the polycarbonate resin in the flame-retardant insulating sheet (1) and the flame-retardant resin composition (1), a molecular weight regulator, a catalyst, etc. may be used as necessary.

[0021] [Flame retardant] The flame retardant contained in the flame-retardant insulating sheet (1) and the flame-retardant resin composition (1) is made of an organic sulfonate. The flame-retardant insulating sheet (1) has sufficient flame retardancy due to the inclusion of the flame retardant made of an organic sulfonate.

[0022] Examples of the organic sulfonate include aromatic sulfonates, aliphatic sulfonates, and fluoroaliphatic sulfonates, with aromatic sulfonates being preferred.

[0023] The organic sulfonate is preferably an alkali metal salt or an alkaline earth metal salt.

[0024] As the organic sulfonate, a known organic sulfonate used as a flame retardant in the technical field to which the present invention belongs can be used. Examples of the known organic sulfonate include organic sulfonic acid alkali (earth) metal salts described in JP-A-2007-100023 and JP-T-2009-526899.

[0025] As the organic sulfonate, potassium 3-(phenylsulfonyl)benzenesulfonate (the following formula (1)), potassium diphenylsulfone-3,3'-disulfonate (the following formula (2)), potassium p-toluenesulfonate, and potassium perfluorobutanesulfonate are preferred.

[0026] [ka]

[0027] [ka]

[0028] The flame retardant (organic sulfonate) contained in the flame-retardant insulating sheet (1) and the flame-retardant resin composition (1) may be one type or two or more types. When two or more types are used, the combination and ratio thereof can be selected arbitrarily.

[0029] In the flame-retardant insulating sheet (1) and the flame-retardant resin composition (1), the ratio of the content of the flame retardant (organic sulfonate) to the content of the polycarbonate resin is preferably 0.3 to 8 mass%, and may be, for example, any one of 0.3 to 6 mass% and 0.3 to 4 mass%. When the ratio is equal to or more than the lower limit, the flame retardancy of the flame-retardant insulating sheet (1) is further increased. When the ratio is equal to or less than the upper limit, excessive use of the flame retardant is suppressed. However, these are just examples of the ratios.

[0030] [Colorant] The flame-retardant insulating sheet (1) may further contain a coloring material in addition to the polycarbonate resin and the flame retardant. The flame-retardant insulating sheet (1) is colored by containing the coloring material and has concealing properties, making it suitable as a flame-retardant insulating sheet provided between circuit boards in electric and electronic devices. When the flame-retardant insulating sheet (1) further contains a colorant in addition to a polycarbonate resin and a flame retardant, the flame-retardant insulating sheet (1) can be produced using a flame-retardant resin composition (1) containing the polycarbonate resin, the flame retardant, and the colorant. The coloring material contained in the flame-retardant insulating sheet (1) and the flame-retardant resin composition (1) may be, for example, a known coloring material used in combination with a thermoplastic resin. The coloring material may be, for example, a coloring material that imparts hiding properties to the flame-retardant insulating sheet (1) that contains the coloring material. "Hiding ability" refers to the degree to which the base is not visible. A colorant with high hiding ability has a high ability to hide the color of the base.

[0031] More specific examples of the coloring material contained in the flame-retardant insulating sheet (1) and the flame-retardant resin composition (1) include organic pigments, inorganic pigments, dyes, and the like.

[0032] In terms of being able to impart higher concealment properties to the flame-retardant insulating sheet (1), the coloring material contained in the flame-retardant insulating sheet (1) and the flame-retardant resin composition (1) is preferably a black coloring material. Examples of the black coloring material include carbon black, titanium black, iron oxide, and graphite.

[0033] The coloring material contained in the flame-retardant insulating sheet (1) and the flame-retardant resin composition (1) may be one type or two or more types. When there are two or more types, the combination and ratio thereof can be selected arbitrarily.

[0034] In order to provide the flame-retardant insulating sheet (1) with higher flame retardancy and higher concealing properties, the coloring material contained in the flame-retardant insulating sheet (1) and the flame-retardant resin composition (1) is preferably carbon black.

[0035] When the flame-retardant insulating sheet (1) and the flame-retardant resin composition (1) further contain a colorant in addition to the polycarbonate resin and the flame retardant, the ratio of the content of the colorant to the content of the polycarbonate resin is preferably 0.01 to 0.25% by mass, and may be, for example, 0.01% by mass or more and less than 0.15% by mass, or may be 0.15 to 0.25% by mass. When the ratio is equal to or more than the lower limit, the flame-retardant insulating sheet (1) has higher flame retardancy and higher concealment. When the ratio is equal to or less than the upper limit, excessive use of the colorant is suppressed. However, these are just examples of the ratios.

[0036] [Other ingredients] The flame-retardant insulating sheet (1) and the flame-retardant resin composition (1) may contain a silicate compound. In the flame-retardant insulating sheet (1) and the flame-retardant resin composition (1), the ratio of the content of the silicate compound to the content of the polycarbonate resin is preferably less than 2 mass%, more preferably less than 1 mass%, even more preferably less than 0.5 mass%, even more preferably less than 0.1 mass%, and particularly preferably 0 mass%. The flame-retardant insulating sheet (1) and the flame-retardant resin composition (1) may contain other components that do not fall under any of the polycarbonate resin, the flame retardant, and the color material, as necessary, within a range that does not impair the effects of the present invention. The other components can be arbitrarily selected depending on the purpose and are not particularly limited.

[0037] Examples of the other components include other resins not corresponding to the polycarbonate resins, and various additives known in the art not corresponding to the silicate compounds.

[0038] The other components contained in the flame-retardant insulating sheet (1) and the flame-retardant resin composition (1) may be one type or two or more types. When there are two or more types, the combination and ratio thereof can be selected arbitrarily.

[0039] (Other resins) Examples of the other resins contained in the flame-retardant insulating sheet (1) and the flame-retardant resin composition (1) include polyolefins, polyesters, polyethylene terephthalate, polyarylates, polybutylene terephthalates, polylactic acids, styrene-based copolymers (copolymers having structural units derived from styrene), polyacetals, polyamides, polyphenylene ethers, polyphenylene sulfides, polymethyl methacrylates, and cellulose ester resins.

[0040] Examples of the polyolefin include high-density polyethylene, polypropylene, polybutene, ethylene-(meth)acrylic acid copolymer, ethylene-methyl (meth)acrylate copolymer, ethylene-ethyl (meth)acrylate copolymer, ethylene-vinyl acetate copolymer, maleic anhydride-modified polyethylene, carboxylic acid-modified polyethylene, ethylene-propylene copolymer, and ethylene-propylene-diene copolymer.

[0041] In this specification, the term "(meth)acrylic acid" is a concept that encompasses both "acrylic acid" and "methacrylic acid".

[0042] The other resins contained in the flame-retardant insulating sheet (1) and the flame-retardant resin composition (1) may be one type or two or more types. When there are two or more types, the combination and ratio thereof can be selected arbitrarily.

[0043] (Additives) Examples of the additives contained in the flame-retardant insulating sheet (1) and the flame-retardant resin composition (1) include stabilizers, lubricants, processing aids, antistatic agents, antioxidants, neutralizing agents, UV absorbers, dispersants, thickeners, and the like.

[0044] The additives contained in the flame-retardant insulating sheet (1) and the flame-retardant resin composition (1) may be one type or two or more types. When there are two or more types, the combination and ratio thereof can be selected arbitrarily.

[0045] In the flame-retardant insulating sheet (1), the ratio of the total content of the polycarbonate resin and the flame retardant to the total mass of the flame-retardant insulating sheet (1) (([content of polycarbonate resin in flame-retardant insulating sheet (1) (parts by mass)] + [content of flame retardant in flame-retardant insulating sheet (1) (parts by mass)]) / [total mass of flame-retardant insulating sheet (1) (parts by mass)] × 100) is preferably 80 mass% or more, more preferably 90 mass% or more, and may be, for example, any one of 95 mass% or more, 97 mass% or more, and 99 mass% or more. When the ratio is equal to or more than the lower limit, the flame retardancy, insulation property, concealment property, bending processability, punching processability, and heat resistance of the flame-retardant insulating sheet (1) are further improved. The ratio is usually the same as the ratio of the total content of the polycarbonate resin and the flame retardant to the total content (parts by mass) of components that do not vaporize at room temperature in the flame-retardant resin composition (1) (([content of polycarbonate resin in the flame-retardant resin composition (1) (parts by mass)] + [content of flame retardant in the flame-retardant resin composition (1) (parts by mass)]) / [total content of components that do not vaporize at room temperature in the flame-retardant resin composition (1) (parts by mass)] × 100).

[0046] In other words, for the same reasons as above, in the flame-retardant insulating sheet (1), the ratio of the content of the other components to the total mass of the flame-retardant insulating sheet (1) ([Content of other components in the flame-retardant insulating sheet (1) (parts by mass)] / [Total mass of the flame-retardant insulating sheet (1)]×100) is preferably 20% by mass or less, more preferably 10% by mass or less, and may be, for example, any one of 5% by mass or less, 3% by mass or less, and 1% by mass or less. The ratio is usually the same as the ratio of the content of the other components to the total content (parts by mass) of components in the flame-retardant resin composition (1) that do not vaporize at room temperature ([content (parts by mass) of other components in the flame-retardant resin composition (1)] / [total content (parts by mass) of components in the flame-retardant resin composition (1) that do not vaporize at room temperature)]×100).

[0047] [Characteristics of flame-retardant insulation sheet (1)] The Spc of one or both surfaces of the flame-retardant insulating sheet (1) is 200 (1 / mm) or more, and may be, for example, any one of 400 (1 / mm) or more, 600 (1 / mm) or more, and 700 (1 / mm) or more. When the Spc is equal to or more than the lower limit, the points of contact with other objects become sharp, so that the flame-retardant insulating sheet (1) is prevented from sticking when stacked and stored.

[0048] In this specification, not only in the case of the flame-retardant insulating sheet (1), the Spc of the sheet surface is a value measured in accordance with ISO 25178.

[0049] The upper limit of Spc on one or both sides of the flame-retardant insulating sheet 1 is not particularly limited. In order to prevent the Spc value from becoming excessive and to facilitate the production of the flame-retardant insulating sheet 1, it is preferable that the Spc is 2100 (1 / mm) or less.

[0050] The Spc of one or both surfaces of the flame-retardant insulating sheet (1) may be, for example, any one of 200 to 2100 (1 / mm), 400 to 2100 (1 / mm), 600 to 2100 (1 / mm), and 700 to 2100 (1 / mm).

[0051] The Spc of both surfaces of the flame-retardant insulating sheet (1) may be the same or different, regardless of whether or not each is 200 (1 / mm) or more.

[0052] The 60° gloss of at least one surface of the flame-retardant insulating sheet (1) (a surface having an Spc of 200 (1 / mm) or more) is preferably 25 or less, and may be, for example, any of 20 or less, 15 or less, and 10 or less. When the 60° gloss of one or both surfaces of the flame-retardant insulating sheet (1) is equal to or less than the upper limit, the surface becomes less smooth, and the flame-retardant insulating sheet (1) is more prevented from sticking when stacked and stored. Furthermore, even if the surface of the flame-retardant insulating sheet (1) has scratches, their presence is not noticeable.

[0053] In this specification, the 60° gloss of the sheet surface is a value measured in accordance with JIS Z 8741, not limited to the case of the flame-retardant insulating sheet (1).

[0054] The lower limit of the 60° gloss of one or both surfaces (surfaces having an Spc of 200 (1 / mm) or more) of the flame-retardant insulating sheet (1) is not particularly limited. In order to avoid an excessively small 60° gloss and to more easily produce the flame-retardant insulating sheet (1), the 60° gloss is preferably 5 or more.

[0055] The 60° gloss of one or both surfaces of the flame-retardant insulating sheet (1) (surfaces having an Spc of 200 (1 / mm) or more) may be, for example, any one of 5-25, 5-20, 5-15, and 5-10.

[0056] The 60° gloss of both surfaces of the flame-retardant insulating sheet (1) may be the same or different.

[0057] The thickness of the flame-retardant insulating sheet (1) is not particularly limited and can be selected arbitrarily depending on the purpose. For example, the thickness of the flame-retardant insulating sheet (1) is preferably 30 to 900 μm, and may be any of 300 to 600 μm, 600 to 900 μm, and 400 to 500 μm.

[0058] [Method of manufacturing flame-retardant insulating sheet (1)] The flame-retardant insulating sheet (1) can be produced, for example, by forming a resin sheet using the flame-retardant resin composition (1) by applying a known molding method such as a calendaring method, an extrusion method, a pressing method, or a casting method. In this case, the resin sheet obtained above may be used as it is as the flame-retardant insulating sheet 1. Alternatively, for example, a heated press plate with an adjusted surface condition is brought into contact with one or both sides of the resin sheet obtained above, the resin sheet is heated and pressed by the press plate, and the surface condition of the press plate is transferred to one or both sides of the resin sheet, thereby producing a flame-retardant insulating sheet 1 in which the Spc of one or both sides satisfies the above-mentioned condition (Spc adjusted).

[0059] The 60° gloss of one or both surfaces of the flame-retardant insulation sheet (1) can also be adjusted by transferring the surface condition of the press plate to these surfaces in the same manner as in the adjustment of the Spc described above.

[0060] <Flame-retardant insulation sheet (2)> A flame-retardant insulating sheet according to one embodiment of the present invention includes a polycarbonate resin and a flame retardant, the flame retardant being made of an organic sulfonate, and the flame retardant has a peak density (Spd) of 8000 (1 / mm 2 ) (In this specification, this flame-retardant insulating sheet may be referred to as “flame-retardant insulating sheet (2)”). "Peak density (Spd)" refers to the number of peaks per unit area. A large Spd indicates a large number of contact points with other objects. The flame-retardant insulating sheet of this embodiment (flame-retardant insulating sheet (2)) has flame retardancy and insulating properties, and is therefore suitable as a flame-retardant insulating sheet to be provided between circuit boards in electric and electronic devices. The flame-retardant insulating sheet (2) has an Spd of 8000 (1 / mm 2 ), the number of contact points with other objects increases and the contact area decreases, thereby preventing sticking when stacked and stored. For example, in both cases where a long flame-retardant insulating sheet (2) is wound in a roll and stored, and where non-long flame-retardant insulating sheets (2) are stacked in the thickness direction and stored, sticking of the flame-retardant insulating sheet (2) is prevented.

[0061] The flame-retardant insulating sheet (2) may further contain a coloring material in addition to the polycarbonate resin and the flame retardant. The flame-retardant insulating sheet (2) is colored by containing the coloring material and has concealing properties, making it suitable as a flame-retardant insulating sheet provided between circuit boards in electric and electronic devices. The flame-retardant insulating sheet (2) can be produced using a flame-retardant resin composition containing the polycarbonate resin and a flame retardant (sometimes referred to as "flame-retardant resin composition (2)" in this specification). When the flame-retardant insulating sheet (2) further contains a coloring material in addition to the polycarbonate resin and the flame retardant, the flame-retardant insulating sheet (2) can be produced using a flame-retardant resin composition (2) containing the polycarbonate resin, the flame retardant, and the coloring material. The flame-retardant resin composition (2) may contain, as necessary, other components that do not fall under any of the polycarbonate resin, the flame retardant, and the color material, as long as the effects of the present invention are not impaired.

[0062] The polycarbonate resin, the flame retardant, the color material, and the other components contained in the flame-retardant insulation sheet (2) and the flame-retardant resin composition (2) are the same as the polycarbonate resin, the flame retardant, the color material, and the other components contained in the flame-retardant insulation sheet (1) and the flame-retardant resin composition (1), respectively.

[0063] The flame-retardant resin composition (2) may be the same as the flame-retardant resin composition (1), and detailed description thereof will be omitted.

[0064] The peak density (Spd) of at least one surface of the flame-retardant insulating sheet (2) is 8000 (1 / mm 2 ) or more, for example, 10000 (1 / mm 2 ) or more, 12000(1 / mm 2 ) or more, and 15000 (1 / mm 2When the Spd of one or both surfaces of the flame-retardant insulating sheet (2) is equal to or greater than the lower limit, the number of contact points with other objects increases and the contact area decreases, thereby preventing the flame-retardant insulating sheet (2) from sticking to other objects when stacked and stored.

[0065] In this specification, not only in the case of the flame-retardant insulating sheet (2), the Spd of the sheet surface is a value measured in accordance with ISO 25178.

[0066] The upper limit of Spd on one or both sides of the flame-retardant insulating sheet (2) is not particularly limited. In order to prevent the Spd from becoming excessively large and to facilitate the production of the flame-retardant insulating sheet (2), the Spd is preferably 22000 (1 / mm 2 ) or less.

[0067] The Spd of one or both surfaces of the flame-retardant insulating sheet (2) is, for example, 8000 to 22000 (1 / mm 2 ), 10000~22000(1 / mm 2 ), 12000~22000(1 / mm 2 ), and 15000~22000(1 / mm 2 ) may be used.

[0068] The Spd of both sides of the flame-retardant insulating sheet (2) is 8000 (1 / mm 2 ) or more, they may be the same or different.

[0069] The flame-retardant insulating sheet (2) may be the same as the flame-retardant insulating sheet (1) described above, except that at least one surface of the flame-retardant insulating sheet (2) satisfies the above-described Spd condition instead of the Spc condition described above.

[0070] At least one surface of the flame-retardant insulating sheet (2) (Spd is 8000 (1 / mm 2) or higher) is preferably 25 or less, and may be, for example, any one of 20 or less, 15 or less, and 10 or less. When the 60° gloss of one or both sides of the flame-retardant insulating sheet (2) is equal to or less than the upper limit, the surface becomes less smooth, and sticking of the flame-retardant insulating sheets (2) when stacked and stored is more suppressed.

[0071] Flame-retardant insulation sheet (2) on one or both sides (Spd is 8000 (1 / mm 2 The lower limit of the 60° gloss of the surface (surface (1) being 5 or more) is not particularly limited. In order to prevent the 60° gloss from becoming excessively small and to more easily produce the flame-retardant insulating sheet (2), the 60° gloss is preferably 5 or more.

[0072] Flame-retardant insulation sheet (2) on one or both sides (Spd is 8000 (1 / mm 2 The 60° gloss of the surface (surface that is equal to or greater than the surface) may be, for example, any one of 5 to 25, 5 to 20, 5 to 15, and 5 to 10.

[0073] The 60° gloss of both surfaces of the flame-retardant insulating sheet (2) may be the same or different.

[0074] The thickness of the flame-retardant insulating sheet (2) is not particularly limited and can be selected arbitrarily depending on the purpose. For example, the thickness of the flame-retardant insulating sheet (2) is preferably 30 to 900 μm, and may be any of 300 to 600 μm, 600 to 900 μm, and 400 to 500 μm.

[0075] [Method of manufacturing flame-retardant insulating sheet (2)] The flame-retardant insulating sheet (2) can be produced, for example, by forming a resin sheet using the flame-retardant resin composition (2) by applying a known molding method such as a calendaring method, an extrusion method, a pressing method, or a casting method. In this case, the resin sheet obtained above may be used as it is as the flame-retardant insulating sheet 2. Alternatively, for example, a heated press plate having a regulated surface condition is brought into contact with one or both sides of the resin sheet obtained above, the resin sheet is heated and pressurized by the press plate, and the surface condition of the press plate is transferred to one or both sides of the resin sheet, thereby producing a flame-retardant insulating sheet 2 in which Spd of one or both sides satisfies the above-mentioned condition.

[0076] The 60° gloss of one or both surfaces of the flame-retardant insulation sheet (2) can also be adjusted by transferring the surface condition of the press plate to these surfaces in the same manner as in the adjustment of Spd described above.

[0077] <Flame-retardant insulation sheet (3)> A flame-retardant insulating sheet according to one embodiment of the present invention contains a polycarbonate resin and a flame retardant, the flame retardant being made of an organic sulfonate, and at least one surface of the flame-retardant insulating sheet has a 60° gloss of 25 or less (in this specification, this flame-retardant insulating sheet may be referred to as “flame-retardant insulating sheet (3)”). "60° gloss" refers to the intensity ratio between incident light and specular reflected light (reflected light with the same angle of incidence and reflection) when light is irradiated onto an object at an incident angle of 60°. If the surface is smooth, specular reflection predominates, resulting in a high gloss, whereas if the surface is rough, light is diffusely reflected in various directions, resulting in a low gloss. The flame-retardant insulating sheet of this embodiment (flame-retardant insulating sheet (3)) has flame retardancy and insulating properties, and is therefore suitable as a flame-retardant insulating sheet to be provided between circuit boards in electric and electronic devices. The flame-retardant insulating sheet (3) has a 60° gloss of 25 or less on at least one surface, which reduces the smoothness of the surface and reduces sticking when stacked and stored. For example, sticking of the flame-retardant insulating sheet (3) is reduced in both cases, when a long flame-retardant insulating sheet (3) is wound in a roll and stored, and when non-long flame-retardant insulating sheets (3) are stacked in the thickness direction and stored.

[0078] The flame-retardant insulating sheet (3) may further contain a coloring material in addition to the polycarbonate resin and the flame retardant. The flame-retardant insulating sheet (3) is colored by containing the coloring material and has concealing properties, making it suitable as a flame-retardant insulating sheet provided between circuit boards in electric and electronic devices. The flame-retardant insulating sheet (3) can be produced using a flame-retardant resin composition containing the polycarbonate resin and a flame retardant (sometimes referred to as "flame-retardant resin composition (3)" in this specification). When the flame-retardant insulating sheet (3) further contains a coloring material in addition to the polycarbonate resin and the flame retardant, the flame-retardant insulating sheet (3) can be produced using a flame-retardant resin composition (3) containing the polycarbonate resin, the flame retardant, and the coloring material. The flame-retardant resin composition (3) may contain, as necessary, other components that do not fall under any of the polycarbonate resin, the flame retardant, and the color material, as long as the effects of the present invention are not impaired.

[0079] The polycarbonate resin, the flame retardant, the color material, and the other components contained in the flame-retardant insulation sheet (3) and the flame-retardant resin composition (3) are the same as the polycarbonate resin, the flame retardant, the color material, and the other components contained in the flame-retardant insulation sheet (1) and the flame-retardant resin composition (1), respectively.

[0080] The flame-retardant resin composition (3) may be the same as the flame-retardant resin composition (1), and detailed description thereof will be omitted.

[0081] The 60° gloss of at least one surface of the flame-retardant insulating sheet (3) is not more than 25, and may be, for example, any one of not more than 20, not more than 15, and not more than 10. When the 60° gloss of one or both surfaces of the flame-retardant insulating sheet (3) is not more than the upper limit, the surface becomes less smooth, and sticking of the flame-retardant insulating sheets (3) when stacked and stored is more suppressed.

[0082] There is no particular lower limit for the 60° gloss of one or both sides of the flame-retardant insulating sheet (3). In order to avoid an excessively low 60° gloss and to facilitate the production of the flame-retardant insulating sheet (3), the 60° gloss is preferably 5 or more.

[0083] The 60° gloss of one or both surfaces of the flame-retardant insulating sheet (3) may be, for example, any one of 5-25, 5-20, 5-15, and 5-10.

[0084] The 60° gloss of both surfaces of the flame-retardant insulating sheet (3) may be the same or different, regardless of whether each is 25 or less.

[0085] The flame-retardant insulating sheet (3) may be the same as the flame-retardant insulating sheet (1) described above, except that at least one surface of the flame-retardant insulating sheet (3) satisfies the above-mentioned 60° gloss condition instead of the Spc condition described above.

[0086] The thickness of the flame-retardant insulating sheet (3) is not particularly limited and can be selected arbitrarily depending on the purpose. For example, the thickness of the flame-retardant insulating sheet (3) is preferably 30 to 900 μm, and may be any of 300 to 600 μm, 600 to 900 μm, and 400 to 500 μm.

[0087] [Method of manufacturing flame-retardant insulating sheet (3)] The flame-retardant insulating sheet (3) can be produced, for example, by forming a resin sheet using the flame-retardant resin composition (3) by applying a known molding method such as a calendaring method, an extrusion method, a pressing method, or a casting method. In this case, the resin sheet obtained above may be directly used as the flame-retardant insulating sheet (3). Alternatively, for example, a heated press plate having a regulated surface condition is brought into contact with one or both sides of the resin sheet obtained above, the resin sheet is heated and pressurized by the press plate, and the surface condition of the press plate is transferred to one or both sides of the resin sheet, thereby producing a flame-retardant insulating sheet (3) whose 60° gloss on one or both sides satisfies the above-mentioned condition.

[0088] <Preferable flame-retardant insulating sheet> As an example of a preferred flame-retardant insulating sheet of the present embodiment, there is provided a flame-retardant insulating sheet (1) having a 60° gloss of 25 or less on a surface of the flame-retardant insulating sheet (1) having an Spc of 200 (1 / mm) or more, and a flame-retardant insulating sheet (2) having an Spd of 8000 (1 / mm) or more on a surface of the flame-retardant insulating sheet (1) having an Spc of 200 (1 / mm) or more on a surface of the flame-retardant insulating sheet (2). 2 ) or more has a 60° gloss of 25 or less.

[0089] There is a high negative correlation between Spc and 60° gloss on one or both sides of the flame-retardant insulating sheet (1). Similarly, there is a high negative correlation between Spd and 60° gloss on one or both sides of the flame-retardant insulating sheet (2). However, for resin sheets in general, it cannot be said that there is necessarily a high correlation between Spc and 60° gloss on one or both sides. For flame-retardant insulation sheet (1) and flame-retardant insulation sheet (2), there is no high correlation between 60° gloss and other parameters related to surface roughness that do not fall under either Spc or Spd on one or both sides of the sheet. In other words, both flame-retardant insulating sheet (1) that satisfies the above-mentioned relationship between Spc and 60° gloss, and flame-retardant insulating sheet (2) that satisfies the above-mentioned relationship between Spd and 60° gloss, have extremely limited configurations.

[0090] <<Electrical and electronic equipment>> The electric / electronic device according to one embodiment of the present invention is configured using the flame-retardant insulating sheet according to the embodiment of the present invention described above, i.e., one or more flame-retardant insulating sheets selected from the group consisting of the flame-retardant insulating sheet (1), the flame-retardant insulating sheet (2), and the flame-retardant insulating sheet (3). An example of the electric / electronic device of the present embodiment is an electric / electronic device configured by sandwiching the flame-retardant insulating sheet between circuit boards, in which the flame-retardant insulating sheet prevents short circuits between the circuit boards. EXAMPLES

[0091] The present invention will be described in more detail below with reference to specific examples, although the present invention is not limited to the following examples.

[0092] The raw materials used in each of the examples and comparative examples are shown below. [Polycarbonate resin] PC(1): Mitsubishi Engineering Plastics "E-2000", weight average molecular weight 27000 PC(2): Mitsubishi Engineering Plastics "H-3000", weight average molecular weight 20,000 [Flame retardant] SO(1): organic sulfonate (Arkema "Arichem KSS-FR") (above formula (1)) SO(2): Organic sulfonate (Arkema "Arichem HES-FR") [Colorant] CB(1): Carbon black CB40

[0093] [Example 1] <<Production of flame-retardant insulating sheets>> The PC(1) (100 parts by mass), the SO(1) (6 parts by mass), and the CB(1) (0.1 parts by mass) were melt-kneaded using a twin-screw extruder to produce pellets corresponding to the flame-retardant resin composition. The pellets obtained were extruded into a sheet using a co-rotating twin screw extruder and a T-shaped die, and the thickness was adjusted. A pair of press plates was prepared. For the surface of one of these press plates, the Spc measured in accordance with ISO 25178 was 1400 (1 / mm), and for the surface of the other of these press plates, the Spc measured in accordance with ISO 25178 was 1900 (1 / mm). The sheet obtained above was sandwiched between a pair of press plates having the above Spc, and using a hot press machine, these press plates were heated to about 180°C, and while melting PC(1), pressure was applied and rapid cooling was performed to obtain the target flame-retardant insulating sheet (thickness 400 μm).

[0094] <<Evaluation of Flame-Retardant Insulating Sheet>> <Measurement of Spc, Spd and 60° Glossiness> For one surface of the flame-retardant insulating sheet obtained above, using a laser microscope ("VK-X3000" manufactured by Keyence Corporation), in accordance with ISO 25178, Spc and Spd were measured, and using "PG1" manufactured by Nippon Denshoku Industries Co., Ltd., in accordance with JIS Z 8741, the 60° glossiness was measured. The results are shown in Table 1.

[0095] <Evaluation of Adhesion Suppression Effect> By overlapping the surfaces of the two flame-retardant insulating sheets obtained above, these flame-retardant insulating sheets were laminated, and by placing a weight on the upper surface of the obtained laminate, a pressure of 500 g / cm 2 was applied in the thickness direction of the laminate, and it was left standing at room temperature for 24 hours. Next, at room temperature, the weight was removed from the laminate, and the presence or absence of adhesion between the two flame-retardant insulating sheets in the laminate was confirmed. When no adhesion was observed, it was determined as "A: There is an adhesion suppression effect", and when adhesion was observed, it was determined as "B: There is no adhesion suppression effect". The results are shown in Table 1.

[0096] <<Manufacture and Evaluation of Flame-Retardant Insulating Sheet>> [Examples 2 to 4] Flame-retardant insulating sheets were produced and evaluated in the same manner as in Example 1, except that at least one of the types and amounts of the components was changed so that the types and amounts of the components contained in the flame-retardant insulating sheets were as shown in Table 1. The results are shown in Table 1.

[0097] [Comparative Example 1] A pair of press plates was prepared. The surface of one of the press plates had an Spc of 150 (1 / mm) as measured in accordance with ISO 25178, and the surface of the other press plate had an Spc of 180 (1 / mm) as measured in accordance with ISO 25178. Except for using this pair of press plates, a flame-retardant insulating sheet was produced and evaluated in the same manner as in Example 1. The results are shown in Table 1.

[0098] [Table 1]

[0099] As is clear from the above results, sticking of the flame-retardant insulating sheet was suppressed in Examples 1 to 4. In Examples 1 to 4, Spc was 240 (1 / mm) or more (240 to 600 (1 / mm)), and Spd was 8000 (1 / mm 2 ) or more (8000~12000(1 / mm 2 )) and the 60° gloss was 25 or less (10 to 15).

[0100] In contrast, sticking of the flame-retardant insulating sheet was not suppressed in Comparative Example 1. In Comparative Example 1, Spc was 76 (1 / mm), Spd was below the detection limit, and the 60° gloss was 34. [Industrial Applicability]

[0101] INDUSTRIAL APPLICABILITY The present invention can be used as a flame-retardant insulating sheet provided between circuit boards in electric and electronic devices (for example, high-voltage devices such as industrial power supplies and in-vehicle devices).

Claims

1. A flame-retardant insulating sheet, The flame-retardant insulating sheet contains a polycarbonate resin and a flame retardant, The flame retardant is an organic sulfonate. At least one surface of the flame-retardant insulating sheet has an arithmetic mean peak curvature (Spc) of 200 (1 / mm) or more.

2. A flame-retardant insulating sheet, The flame-retardant insulating sheet contains a polycarbonate resin and a flame retardant, The flame retardant is an organic sulfonate. The peak density (Spd) of at least one surface of the flame-retardant insulating sheet is 8000 (1 / mm ２ ) or more.

3. A flame-retardant insulating sheet, The flame-retardant insulating sheet contains a polycarbonate resin and a flame retardant, The flame retardant is an organic sulfonate. The flame-retardant insulating sheet, wherein at least one surface of the flame-retardant insulating sheet has a 60° gloss of 25 or less.

4. The flame-retardant insulating sheet according to claim 1 or 2, wherein the 60° gloss of the surface is 25 or less.

5. The flame-retardant insulating sheet according to any one of claims 1 to 3, further comprising a coloring material.

6. The flame-retardant insulating sheet according to claim 5 , wherein the coloring material is carbon black.

7. The flame-retardant insulating sheet according to any one of claims 1 to 3, wherein the polycarbonate resin has a weight average molecular weight of 15,000 to 35,000.

8. The flame-retardant insulating sheet according to any one of claims 1 to 3, wherein a ratio of the content of the flame retardant to the content of the polycarbonate resin in the flame-retardant insulating sheet is 0.3 to 8 mass%.

9. An electric / electronic device using the flame-retardant insulating sheet according to any one of claims 1 to 3.

Images