Polyvinylidene fluoride resin composition and molded article

Abstract

The present invention addresses the problem of providing: a polyvinylidene fluoride resin composition which is not susceptible to a hydrogen fluoride elimination reaction from a vinylidene fluoride polymer during molding, while exhibiting high transparency; and a molded body of this polyvinylidene fluoride resin composition. A resin composition according to the present invention, which solves the above-described problem, contains a vinylidene fluoride polymer as a main component, while containing ammonium phosphate and / or imidazolium sulfate.

Description

[Technical Field]

[0001] The present invention relates to a polyvinylidene fluoride resin composition and a molded article. [Background technology]

[0002] Vinylidene fluoride resins are used in a variety of fields due to their high strength, chemical resistance, heat resistance, and ferroelectricity. For example, Patent Document 1 describes a resin composition containing a polyvinylidene fluoride resin and an alkyl quaternary ammonium sulfate. This resin composition has excellent transparency and is therefore expected to be used in optical products and the like. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Application Publication No. 2020-105381 Summary of the Invention [Problem to be solved by the invention]

[0004] However, after extensive research, the present inventors have found that although the resin composition described in Patent Document 1 has very good transparency, its thermal stability is insufficient for use in various applications. Specifically, when the resin composition is heated and molded, the vinylidene fluoride polymer and the alkyl quaternary ammonium sulfate interact with each other, resulting in the generation of hydrogen fluoride (HF) from the vinylidene fluoride polymer (also referred to as "dehydrofluorination" in this specification). The generation of such hydrogen fluoride can have an adverse effect on the molding equipment and the surrounding environment, so it is necessary to suppress the generation of dehydrofluorination.

[0005] An object of the present invention is to provide a resin composition that is highly transparent and that is less likely to cause dehydrofluorination of a vinylidene fluoride polymer during molding, and a molded article thereof. [Means for solving the problem]

[0006] The present invention provides a polyvinylidene fluoride resin composition containing a vinylidene fluoride polymer as a main component, and ammonium phosphate and / or imidazolium sulfate.

[0007] The present invention provides a molded article of the polyvinylidene fluoride resin composition, which has a haze of 40% or less when the thickness is set to 2 mm. [Effects of the Invention]

[0008] The polyvinylidene fluoride resin composition of the present invention has high transparency and is less susceptible to dehydrofluorination during molding, and therefore can be used in a variety of applications including optical applications. DETAILED DESCRIPTION OF THE INVENTION

[0009] 1. Polyvinylidene fluoride resin composition The polyvinylidene fluoride resin composition of the present invention (hereinafter also referred to as "resin composition") contains a vinylidene fluoride polymer and ammonium phosphate or imidazolium sulfate.

[0010] As described above, resin compositions containing a vinylidene fluoride polymer and an alkyl quaternary ammonium sulfate have high transparency, but may undergo dehydrofluorination during molding. In contrast, when a vinylidene fluoride polymer is combined with an ammonium phosphate and / or an imidazolium sulfate, as in the present invention, not only does the transparency of the resin composition become extremely high, but the dehydrofluorination reaction during molding is also less likely to occur.

[0011] The reason why the resin composition of the present invention has high transparency is believed to be as follows. The crystal structure of vinylidene fluoride polymers can be α-, β-, or γ-type, and general vinylidene fluoride polymers have an α-type crystal structure. Vinylidene fluoride polymers with an α-type crystal structure usually have low transparency. In contrast, when a vinylidene fluoride polymer is combined with an ionic compound such as ammonium phosphate or imidazolium sulfate and melt-kneaded, the crystal structure of the vinylidene fluoride polymer tends to become β-type. This is believed to be why the transparency of the resin composition is extremely high.

[0012] The reason why the dehydrofluorination reaction is difficult to cause in vinylidene fluoride polymers even when ammonium phosphate or imidazolium sulfate is combined is thought to be as follows.

[0013] The mechanism of the dehydrofluorination reaction is assumed to be that alkyl quaternary ammonium sulfate decomposes when heated, producing amines and sulfur oxides from the alkyl quaternary ammonium cation and sulfate anion, respectively. The resulting amines attack the terminals of the vinylidene fluoride polymer, causing the dehydrofluorination reaction to proceed, generating large amounts of hydrogen fluoride. Meanwhile, the resulting sulfur oxides are thought to vaporize and be released outside the system.

[0014] On the other hand, ammonium phosphate decomposes when heated, generating amines and phosphates. The resulting phosphates trap the amines and inhibit their attack on the vinylidene fluoride polymer, making it difficult for the dehydrofluorination reaction to proceed, and thus suppressing the amount of dehydrofluorination.

[0015] Furthermore, since imidazolium sulfate has a higher decomposition temperature than ammonium sulfate, it is thought that it does not generate chemical species that attack the terminals of the vinylidene fluoride polymer, and as a result, it is possible to suppress the dehydrofluorination reaction. However, in the resin composition according to this embodiment, it is sufficient that the amount of dehydrofluorination generated from the obtained resin composition is suppressed, and the scope of the invention is not limited by this mechanism.

[0016] The vinylidene fluoride polymer, ammonium phosphate, and imidazolium sulfate contained in the resin composition of the present invention will be described in detail below.

[0017] (Vinylidene fluoride polymer) The resin composition of the present invention contains a vinylidene fluoride polymer as a main component. In this specification, "containing a vinylidene fluoride polymer as a main component" means that the resin composition contains 90 parts by mass or more of the vinylidene fluoride polymer, more preferably 95 parts by mass or more, and even more preferably 98 parts by mass or more, per 100 parts by mass of the resin composition.

[0018] The vinylidene fluoride polymer may be a homopolymer of vinylidene fluoride or a copolymer of vinylidene fluoride and another monomer. From the viewpoint of allowing the vinylidene fluoride polymer to sufficiently interact with ammonium phosphate and / or imidazolium sulfate, the vinylidene fluoride polymer preferably contains a sufficient amount of structural units derived from vinylidene fluoride. Specifically, the vinylidene fluoride polymer preferably contains 90 mol% or more of structural units derived from vinylidene fluoride, more preferably 95 mol% or more, and even more preferably 98 mol% or more of structural units derived from vinylidene fluoride, based on all structural units constituting the vinylidene fluoride polymer. When the amount of structural units derived from vinylidene fluoride is equal to or greater than the above value, the vinylidene fluoride polymer in the resin composition is likely to have a desired crystalline structure (β type), and the transparency of the resin composition is likely to be increased. Furthermore, when the amount of the structural units derived from vinylidene fluoride is within the above range, it becomes easier to obtain the properties specific to vinylidene fluoride, such as chemical resistance, heat resistance, ferroelectricity, etc. The amount of the structural units derived from vinylidene fluoride in the vinylidene fluoride polymer is, for example, 19 It can be identified by F-NMR analysis, etc.

[0019] On the other hand, vinylidene fluoride polymers may contain only one type of structural unit derived from a monomer other than vinylidene fluoride, or may contain two or more types. Examples of monomers other than vinylidene fluoride include fluorine-containing alkyl vinyl compounds having a vinyl group and a fluorine-containing alkyl group in one molecule. Examples of fluorine-containing alkyl vinyl compounds include vinyl fluoride, trifluoroethylene, tetrafluoroethylene, chlorotrifluoroethylene, hexafluoropropylene, 2,3,3,3-tetrafluoropropene, pentafluoropropene, fluoroalkyl vinyl ethers, and perfluoroalkyl vinyl ethers typified by perfluoromethyl vinyl ether. Examples of other monomers also include (meth)acrylic acid and (meth)acrylic acid esters typified by methyl (meth)acrylate.

[0020] The structure of the vinylidene fluoride polymer, i.e., the type of monomer to be combined, is appropriately selected depending on the application of the vinylidene fluoride polymer. For example, from the viewpoint of improving the contamination resistance, ozone resistance, and solvent resistance of the resin composition and molded articles obtained therefrom, a vinylidene fluoride homopolymer is preferred. On the other hand, from the viewpoint of improving the flexibility and tear strength of the resin composition and molded articles obtained therefrom, a copolymer of vinylidene fluoride with another monomer, or a mixture of such a copolymer and a vinylidene fluoride homopolymer is preferred. From the viewpoint of the flexibility of the molded articles obtained, the monomer to be copolymerized with vinylidene fluoride is preferably hexafluoropropylene.

[0021] The molecular weight of the vinylidene fluoride polymer is appropriately selected based on the desired physical properties of the molded article. The molecular weight of the vinylidene fluoride polymer can be expressed, for example, by inherent viscosity, and is preferably 0.5 to 2.0 dL / g when moldability is required. The inherent viscosity can be determined by known measurement methods, for example, the method specified in JIS K7367-1.

[0022] From the viewpoint of imparting sufficient mechanical strength, gas barrier properties, and solvent resistance to the molded article, the melting point of the vinylidene fluoride polymer is preferably 130°C or higher and 190°C or lower, more preferably 150°C or higher and 180°C or lower, and particularly preferably 160°C or higher and 180°C or lower. The melting point of the vinylidene fluoride polymer can be adjusted, for example, by the amount of vinylidene fluoride-derived structural units in the vinylidene fluoride polymer or the molecular weight of the vinylidene fluoride polymer. The melting point can be measured using a differential scanning calorimeter.

[0023] Here, the method for producing the vinylidene fluoride polymer is not particularly limited, and examples thereof include emulsion polymerization, soap-free emulsion polymerization, seed emulsion polymerization, suspension polymerization, mini-emulsion polymerization, solution polymerization, etc. Among these, emulsion polymerization and suspension polymerization are preferred.

[0024] Emulsion polymerization is a type of radical polymerization method in which a medium such as water is mixed with a monomer that is poorly soluble in the medium and an emulsifier (hereinafter also referred to as a "surfactant"), and a polymerization initiator that is soluble in the medium is added to the mixture to polymerize the monomer (vinylidene fluoride or other monomers). Known compounds can be used as the surfactant and polymerization initiator. Vinylidene fluoride polymers prepared by emulsion polymerization (also referred to as "emulsion-polymerized vinylidene fluoride polymers" in this specification) tend to have increased transparency and reduced dehydrofluorination amounts, particularly when combined with imidazolium sulfate, as described below.

[0025] On the other hand, suspension polymerization is a polymerization method in which an oil-soluble polymerization initiator is dissolved in a water-insoluble monomer in water containing a suspending agent, etc., and the resulting mixture is suspended and dispersed by mechanical stirring. In suspension polymerization, polymerization proceeds in the monomer droplets to obtain vinylidene fluoride polymer particles. Vinylidene fluoride polymers prepared by suspension polymerization (also referred to herein as "suspension-polymerized vinylidene fluoride polymers") tend to have increased transparency and reduced dehydrofluorination amounts, particularly when combined with ammonium phosphates, as described below.

[0026] (ammonium phosphate and imidazolium sulfate) The resin composition of the present embodiment may contain either one of ammonium phosphate and imidazolium sulfate, or may contain both, but it is usually preferable to contain either one of them.

[0027] The ammonium phosphate is a phosphate of ammonium or alkylammonium, and is, for example, a compound represented by the following general formula (1): The resin composition may contain only one type of ammonium phosphate, or may contain two or more types. [ka] In the above general formula (1), R 1 ~R 4 R represents a hydrogen atom or an alkyl group having 1 to 10 carbon atoms, which may be the same or different. The alkyl group may be linear or branched. Specific examples of the alkyl group include a methyl group, an ethyl group, a propyl group, an isopropyl group, a butyl group, a pentyl group, a hexyl group, a heptyl group, and an octyl group. 1 ~R 4 The total number of hydrogen atoms in R is preferably 52 or less. 1 ~R 4 The total number of carbon atoms contained in each R is preferably 6 or more and 30 or less, more preferably 6 or more and 24 or less, and even more preferably 8 or more and 20 or less. 1 ~R 4 The number of carbon atoms contained in R is more preferably 2 or more and 6 or less, and specifically, R is preferably an ethyl group, a propyl group, a butyl group, a pentyl group, or a hexyl group. 1 ~R 4 When is one of these groups, the transparency of the resulting resin composition tends to be significantly increased.

[0028] On the other hand, in equation (1), R 5 and R 6each represents a group bonded to a P atom, and each independently represents an alkyl group, a fluoroalkyl group, or a hydrogen atom. The alkyl group is preferably an alkyl group having 1 to 10 carbon atoms, specifically a linear alkyl group having 1 to 10 carbon atoms, such as a methyl group or an ethyl group, or a branched alkyl group such as an isopropyl group or a tert-butyl group. On the other hand, a fluoroalkyl group is a group in which some or all of the hydrogen atoms in these alkyl groups have been substituted with fluorine. Examples include a trifluoromethyl group and a pentafluoroethyl group. R 5 and R 6 and are particularly preferably each a hydrogen atom or a tert-butyl group.

[0029] Specific examples of ammonium phosphates represented by the general formula (1) above include ethylammonium phosphate, diethylammonium phosphate, trimethylammonium phosphate, triethylammonium phosphate, tributylammonium pyrophosphate, pentyltriethylammonium phosphate, hexyltriethylammonium phosphate, octyltriethylammonium phosphate, tetramethylammonium dihydrogen phosphate, tetraethylammonium dihydrogen phosphate, tetrabutylammonium phosphate, methyltriethylammonium dibutyl phosphate, dodecyltrimethylammonium phosphate, hexadecyltrimethylammonium dihydrogen phosphate, and tetrahexylammonium dihydrogen phosphate.

[0030] The imidazolium sulfate is a sulfate of imidazolium, and is, for example, a compound represented by the following general formula (2): The resin composition may contain only one type of imidazolium sulfate, or may contain two or more types. [ka] In the above general formula (2), R 7 and R 8represent a hydrogen atom or alkyl groups which may be the same or different and have 1 to 10 carbon atoms. The alkyl groups may be linear or branched. Specific examples of the alkyl group include a methyl group, an ethyl group, a propyl group, an isopropyl group, a butyl group, a pentyl group, a hexyl group, a heptyl group, and an octyl group. Among these, alkyl groups having 1 to 4 carbon atoms are preferred, and specifically, a methyl group, an ethyl group, a propyl group, and a butyl group are preferred.

[0031] In the above general formula (2), R 9 is an alkyl group, a fluoroalkyl group, or a hydrogen atom. The alkyl group is preferably a short-chain alkyl group having 1 to 10 carbon atoms, such as a methyl group or an ethyl group. The fluoroalkyl group is preferably a short-chain fluoroalkyl group having 1 to 10 carbon atoms, such as CF3 or C2F5. R 9 Among these, hydrogen is preferred. That is, the imidazolium sulfate is preferably imidazolium hydrogen sulfate.

[0032] Specific examples of preferred imidazolium sulfates (imidazolium hydrogen sulfates) include 1,3-dimethylimidazolium hydrogen sulfate, 1-methyl-3-propylimidazolium hydrogen sulfate, 1-methyl-3-isopropylimidazolium hydrogen sulfate, 1,3-diethylimidazolium hydrogen sulfate, 1,3-dipropylimidazolium hydrogen sulfate, 1-ethyl-3-propylimidazolium hydrogen sulfate, 1-butyl-3-methylimidazolium hydrogen sulfate, 1-ethyl-3-methylimidazolium hydrogen sulfate, and the like.

[0033] Here, the amount of the ammonium phosphate and / or imidazolium sulfate in the resin composition is not particularly limited. However, the total content of the ammonium phosphate and imidazolium sulfate relative to 100 parts by mass of the vinylidene fluoride polymer is preferably 0.1 to 2 parts by mass, more preferably 0.3 to 1.7 parts by mass, even more preferably 0.4 to 1.5 parts by mass, and particularly preferably 0.7 to 1.3 parts by mass. When the total content of the ammonium phosphate and imidazolium sulfate in the resin composition is within this range, the transparency of the resin composition and its molded article is likely to be improved, and the amount of dehydrofluorination during molding can be reduced.

[0034] (Other ingredients) The resin composition according to this embodiment may further contain other components as long as the effects of this embodiment are obtained. The other components may be one or more types. The content of the additives in the resin composition can be appropriately determined as long as both the effects of this embodiment and the effects of the additives are obtained. Examples of the other components include additives and polymers other than those described above. Examples of additives include heat stabilizers, ultraviolet absorbers, light stabilizers, lubricants, plasticizers, bluing agents, and color inhibitors.

[0035] ·Method of manufacturing resin composition The resin composition can be produced by preparing the vinylidene fluoride polymer and ammonium phosphate and / or imidazolium sulfate described above. Then, these are mixed and melt-kneaded at a temperature equal to or higher than the melting point of the vinylidene fluoride polymer. The temperature during production of the resin composition is preferably 160°C or higher and 280°C or lower. Heating to this temperature allows the crystal structure of the vinylidene fluoride polymer to become a β-form, making it easier to obtain a highly transparent resin composition and, ultimately, a molded article.

[0036] Examples of devices for mixing the materials for the resin composition include a Henschel blender, a cylindrical mixer, a screw mixer, a screw extruder, a turbulizer, a Nauta mixer, a V-type mixer, a ribbon mixer, a twin-arm kneader, a fluid mixer, an airflow mixer, a rotating disk mixer, a roll mixer, a tumbling mixer, and a Lödige mixer. Furthermore, pelletized resin compositions can be obtained by melt-extruding a direct mixture of a vinylidene fluoride polymer and an ammonium phosphate and / or an imidazolium sulfate, or a mixture of an aqueous solution of a vinylidene fluoride polymer and an ammonium phosphate and / or an imidazolium sulfate, followed by drying. Examples of extruders include a single-screw extruder, a co-rotating twin-screw extruder, and a counter-rotating twin-screw extruder.

[0037] 2. Molded body The molded article of the resin composition can be produced by heating and molding the resin composition. The method for molding the resin composition is not particularly limited, and can be performed in the same manner as known molding methods. However, during heating, the molding temperature is preferably 280°C or lower in order to reduce the amount of dehydrofluorination of the vinylidene fluoride polymer. Furthermore, it is preferable to minimize changes in the crystalline structure of the vinylidene fluoride polymer in the resin composition, i.e., to maintain high transparency. Specifically, it is preferable to cool the resin composition at a temperature of 80°C or lower for 60 seconds or longer and then mold the composition.

[0038] The shape of the molded product is not particularly limited, and may be, for example, a film or a plate, or may be a three-dimensional structure. The structure of the molded product is appropriately selected depending on the application of the molded product.

[0039] The haze of the molded article when the thickness is 2 mm is preferably 40% or less, more preferably 30% or less, and even more preferably 20% or less. When the haze of the molded article when the thickness is 2 mm is 40% or less, the molded article can be used for applications requiring transparency, such as optical products. The haze is a value measured using a haze meter in accordance with JIS K7136. Even if the thickness of the molded article is other than 2 mm, the haze can be measured and calculated from the measured value based on an empirical formula. Usually, for molded articles with a thickness of 8 mm or less, the relationship between haze and thickness can be expressed by a linear equation. Therefore, an empirical formula can be created based on the composition of the molded article, and the haze can be calculated from the formula.

[0040] Such a molded article can be used not only for the same purposes as general polyvinylidene fluoride, but also for optical products such as optical films and optical lenses. [Example]

[0041] Specific examples of the present invention will be described below together with comparative examples, but the present invention is not limited to these.

[0042] Example 1 A suspension-polymerized vinylidene fluoride polymer (Polymer A, vinylidene fluoride homopolymer, inherent viscosity 1.070 dl / g, melting point 171°C) was prepared in the same manner as in Example 4 of WO 2006 / 061988. 1 part by mass of tetrabutylammonium phosphate (hereinafter also referred to as "N26") was added to 100 parts by mass of Polymer A. The mixture was then extruded at a cylinder temperature of 190°C using a co-rotating twin-screw extruder (TEM-26, manufactured by Toshiba Machine Co., Ltd.) to obtain a pellet-shaped resin composition 1.

[0043] Example 2 To 100 parts by mass of emulsion-polymerized vinylidene fluoride polymer (Kynar (registered trademark) 740, vinylidene fluoride homopolymer, manufactured by Arkema), 1 part by mass of 1-butyl-3-methylimidazolium hydrogen sulfate (hereinafter also referred to as "I12") was added, and the mixture was extruded using a co-rotating twin-screw extruder in the same manner as in Example 1 to obtain pellet-shaped resin composition 2.

[0044] Example 3 A pellet-shaped resin composition 3 was obtained in the same manner as in Example 2, except that tetrabutylammonium phosphate (N26) was used instead of the 1-butyl-3-methylimidazolium hydrogen sulfate (I12).

[0045] Example 4 A pellet-shaped resin composition 4 was obtained in the same manner as in Example 1, except that the amount of tetrabutylammonium phosphate (N26) was changed to 0.3 parts by mass.

[0046] Example 5 A pellet-shaped resin composition 5 was obtained in the same manner as in Example 1, except that the amount of tetrabutylammonium phosphate (N26) was changed to 0.5 parts by mass.

[0047] Example 6 A pellet-shaped resin composition 6 was obtained in the same manner as in Example 1, except that the amount of tetrabutylammonium phosphate (N26) was changed to 2 parts by mass.

[0048] Example 7 Pellet-shaped resin composition 7 was obtained in the same manner as in Example 1, except that the vinylidene fluoride polymer was changed to a suspension-polymerized vinylidene fluoride polymer (KF#2300, vinylidene fluoride-hexafluoropropylene copolymer, manufactured by Kureha Corporation).

[0049] Example 8 A pellet-shaped resin composition 8 was obtained in the same manner as in Example 1, except that 1 part by mass of di-tert-butyl tetra-N-butylammonium phosphate (hereinafter also referred to as "N30") was used instead of tetrabutylammonium phosphate (N26).

[0050] (Comparative Example 1) A pellet-shaped resin composition 9 was obtained in the same manner as in Example 1, except that tetrabutylammonium phosphate (N26) was not used.

[0051] (Comparative Example 2) A pellet-shaped resin composition 10 was obtained in the same manner as in Example 2, except that 1-butyl-3-methylimidazolium hydrogen sulfate (I12) was not used.

[0052] (Comparative Example 3) A pellet-shaped resin composition 11 was obtained in the same manner as in Example 1, except that 1 part by mass of tetrabutylammonium hydrogen sulfate (hereinafter also referred to as "TBAHS") was used instead of tetrabutylammonium phosphate (N26).

[0053] Comparative Example 4 A pellet-shaped resin composition 12 was obtained in the same manner as in Example 2, except that 1 part by mass of tetrabutylammonium hydrogen sulfate (TBHAS) was used instead of 1-butyl-3-methylimidazolium hydrogen sulfate (I12).

[0054] (Method for producing a molded body) The resin compositions prepared in the above Examples and Comparative Examples were sandwiched between two sheets of aluminum foil, with stainless steel (SUS) plates placed on the outside of each aluminum foil. Then, using a compression molding machine (model AYSR-5, manufactured by Shinto Metal Industries Co., Ltd.), the mixture was pressed at 200°C for 5 minutes at a pressure of 5 MPa. The pressed product was then immediately cooled (quenched) by being held in a cold press at 30°C for 3 minutes while still sandwiched between the SUS plates. This produced a sheet-like molded product. The thickness of each molded product was measured five times per sample using a thickness gauge "DG-925" (manufactured by Ono Sokki Co., Ltd.) to calculate the average value. This average value was used as the thickness of the molded product. All measurements were 2 mm.

[0055] (Hayes) The haze of each molded article (thickness: 2 mm) was measured in accordance with JIS K7136 using a haze meter "NDH4000" (manufactured by Nippon Denshoku Industries Co., Ltd.) The results are shown in Table 1.

[0056] (amount of dehydrofluorination) A sheet-like compact was prepared using the same method as described above. 300 mg of the sheet was placed on a quartz glass boat and heated at 260°C for 2 hours in a ceramic electric tubular furnace (manufactured by Asahi Rika Seisakusho Co., Ltd.) under a nitrogen flow of 100 mL / min. The generated gas was absorbed with 20 mL of NaHCO3 + Na2CO3 aqueous solution, and the volume was adjusted to 30 mL. The initial concentrations of NaHCO3 and Na2CO3 were adjusted to 1.9 mM and 3.2 mM, respectively, after the volume was adjusted to 100 mL. The fluoride ion concentration was then determined from the solution using an ion chromatograph (Tosoh Corporation, Model IC-2010). The results are shown in Table 1.

[0057] [Table 1]

[0058] As shown in Table 1 above, when a vinylidene fluoride polymer was used alone, the haze was high regardless of the method for producing the vinylidene fluoride polymer (Comparative Examples 1 and 2). Furthermore, when tetrabutylammonium hydrogen sulfate was added to a vinylidene fluoride polymer, the haze decreased, but the amount of dehydrofluorination became significantly large (Comparative Examples 3 and 4). In contrast, when ammonium phosphate or imidazolium sulfate (imidazolium hydrogen sulfate) was added to a vinylidene fluoride polymer, not only did the haze of the molded article decrease, but the amount of dehydrofluorination also became significantly small (Examples 1 to 8).

[0059] This application claims priority from Japanese Patent Application No. 2022-049939, filed March 25, 2022, the entire contents of which are incorporated herein by reference. [Industrial Applicability]

[0060] According to the present invention, a resin composition and a molded article thereof having high transparency and a small amount of dehydrofluorination during molding can be obtained. The resin composition and the molded article thereof can be used not only for general resin products but also for products requiring transparency, such as optical products, and are therefore very useful in various industrial fields.

Claims

1. A vinylidene fluoride polymer as the main component, ammonium phosphate, A polyvinylidene fluoride resin composition comprising: the content of the ammonium phosphate is 0.1 parts by mass or more and 2 parts by mass or less with respect to 100 parts by mass of the vinylidene fluoride polymer; Polyvinylidene fluoride resin composition.

2. the ammonium phosphate comprises an alkyl quaternary ammonium phosphate; The polyvinylidene fluoride resin composition according to claim 1.

3. the ammonium phosphate; a suspension-polymerized vinylidene fluoride polymer; The polyvinylidene fluoride resin composition according to claim 1 or 2, comprising:

4. The vinylidene fluoride polymer is a homopolymer of vinylidene fluoride. The polyvinylidene fluoride resin composition according to claim 1 or 2.

5. A molded article of the polyvinylidene fluoride resin composition according to claim 1 or 2, The haze is 40% or less when the thickness is 2 mm. Molded body.

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