Propylene resin composition and its uses

Abstract

To provide a propylene resin composition that has excellent antistatic properties and is suitable for obtaining a molding with a reduced amount of volatilization.SOLUTION: A propylene resin composition contains a propylene resin (A), an ethylene-α-olefin copolymer (B), an antistatic agent (C) and an inorganic filler and is free of alkyl acid diethanolamide.SELECTED DRAWING: None

Description

Technical Field

[0001] The present invention relates to a propylene-based resin composition and its uses. More specifically, it relates to uses such as a propylene-based resin composition and a molded body that have a low volatilization amount and excellent antistatic properties.

Background Art

[0002] Polypropylene resin is used in automotive interior and exterior materials, electrical component boxes, etc. In order to prevent the charging of polypropylene resin, it is known to blend an antistatic agent into the polypropylene resin.

[0003] For example, Patent Document 1 discloses a polyolefin resin in which a glycerin monoester and an amine compound having a specific molecular structure are blended in a total amount of 0.1 to 5 parts by mass with respect to 100 parts by mass of the polyolefin resin at a weight ratio of 1 / 0.01 to 1 / 0.5.

[0004] Patent Document 2 discloses a propylene resin composition in which a fatty acid ester and an alkyldiethanolamine are blended in a total amount of 0.01 to 2.0 parts by mass with respect to 100 parts by mass of the polypropylene resin at a ratio of 1 / 0.03 to 1 / 0.11.

[0005] Further, Patent Document 3 proposes that by blending 0.01 to 0.4 parts by mass of an N,N'-di(hydroxyethyl)alkylamide together with an antistatic agent containing 0.1 to 0.4 parts by mass of at least one ester compound (component (i)) selected from the group consisting of fatty acid esters of monoglycerin and fatty acid esters of diglycerin and 0.1 to 0.4 parts by mass of stearyldiethanolamine monostearate (component (ii)) with respect to 100 parts by mass of the polypropylene resin, a polypropylene resin composition with a low acetaldehyde emission amount can be obtained.

[0006] While the inclusion of an antistatic agent improves antistatic properties, some antistatic agents in the polypropylene resin composition may volatilize from the resulting molded article, requiring countermeasures depending on the application. [Prior art documents] [Patent Documents]

[0007] [Patent Document 1] Japanese Patent Publication No. 2003-82169 [Patent Document 2] Japanese Patent Application Publication No. 10-292072 [Patent Document 3] Japanese Patent Publication No. 2014-201615 [Overview of the Initiative] [Problems that the invention aims to solve]

[0008] The object of the present invention is to obtain a propylene-based resin composition suitable for obtaining molded articles that have excellent antistatic properties and reduced volatility. [Means for solving the problem]

[0009] In other words, the present invention relates to the following [1] to [4]. [1] A propylene resin composition characterized by comprising a propylene resin (A) containing the polymers described in (a-1) and (a-2) below, an ethylene-α-olefin copolymer (B) below, an antistatic agent (C) below, and an inorganic filler below, and not containing alkyl acid diethanolamide. Propylene resin (A) (a-1) A propylene polymer having a melt flow rate (MFR, 230°C, load 2.16 kg) measured in accordance with JIS K 7210 in the range of 10 to 300 g / 10 min, a content of constituent units derived from propylene in the range of 98 to 100 mol%, and a content of constituent units derived from ethylene and at least one α-olefin selected from α-olefins having 4 to 8 carbon atoms in the range of 0 to 2 mol% [provided that the total amount of (a-1) and (a-2) is 100% by mass]. (a-2) 0 to 30 parts by mass of a propylene-ethylene copolymer having an intrinsic viscosity [η] of 1.5 to 8 dl / g or less measured in decalin at 135°C, and containing 30 to 60 mol% of constituent units derived from ethylene [provided that the total amount of (a-1) and (a-2) is 100% by mass]. 70 to 99 parts by mass of propylene resin (A) [however, the total amount of (A) and (B) shall be 100 parts by mass]. Ethylene-α-olefin copolymer (B) An ethylene-α-olefin copolymer comprising ethylene and at least one α-olefin selected from α-olefins having 3 to 8 carbon atoms, wherein the content of constituent units derived from ethylene is in the range of 65 to 90 mol%. Ethylene-α-olefin copolymer (B) 1 to 30 parts by mass [however, the total amount of (A) and (B) shall be 100 parts by mass], The total amount of the above propylene resin (A) and the above ethylene-α-olefin copolymer (B): 100 parts by mass, If the antistatic agent (C) is contained in an amount of 0.1 to 0.5 parts by mass, and the antistatic agent (C) includes a polyhydric alcohol fatty acid ester, the amount of polyhydric alcohol fatty acid ester is 0.15 parts by mass or less. and Inorganic filler: 0 to less than 5 parts by mass. [2] Automotive interior component comprising the propylene resin composition described in item [1]. [3] The automotive interior component described in item [2], wherein the automotive interior component is an automotive door component. [4] A molded body obtained by injection molding an automotive interior component as described in item [2] or item [3]. [Effects of the Invention]

[0010] The propylene-based resin composition of the present invention has excellent antistatic properties and reduced volatility, making it suitable for use in molded articles such as automotive interior and exterior components. [Modes for carrying out the invention]

[0011] <Propylene resin (A)> One of the components contained in the propylene resin composition of the present invention, the propylene resin (A), includes the polymer described in (a-1) and (a-2) below.

[0012] The propylene-based resin (A) according to the present invention typically has a melt flow rate (MFR, 230°C, load 2.16 kg) measured by a method compliant with JIS K 7210, which is in the range of 10 to 300 g / 10 min, preferably 20 to 270 g / 10 min, and more preferably 30 to 250 g / 10 min.

[0013] (a-1) The propylene polymer (a-1) is one in which the melt flow rate (MFR, 230℃, load 2.16kg) measured by a method compliant with JIS K 7210 is in the range of 10 to 300 g / 10 min, preferably 20 to 270 g / 10 min, more preferably 30 to 250 g / 10 min, the content of constituent units derived from propylene is in the range of 98 to 100 mol%, preferably 98.5 to 100 mol%, more preferably 99 to 100 mol%, and the content of constituent units derived from ethylene and at least one α-olefin selected from α-olefins having 4 to 8 carbon atoms is in the range of 0 to 2 mol%, preferably 0 to 1.5 mol%, more preferably 0 to 1 mol%, and a homopolymer of propylene is particularly preferred.

[0014] (a-2) The intrinsic viscosity [η] measured in decalin at 135°C is in the range of 1.5 to 8 dl / g, preferably 1.6 to 7.5 dl / g, more preferably 1.8 to 7.0 dl / g, and the content of the structural unit derived from ethylene is in the range of 30 to 60 mol%, preferably 30 to 55 mol%, more preferably 30 to 50 mol%. Propylene-ethylene copolymer (a-2).

[0015] The propylene-based resin (A) according to the present invention contains 70 to 100% by mass, preferably 73 to 100% by mass, more preferably 70 to 100% by mass of the above propylene-based polymer (a-1), and 0 to 30% by mass, preferably 0 to 27% by mass, more preferably 0 to 25% by mass of the above propylene-ethylene copolymer (a-2) [however, the total amount of (a-1) + (a-2) is 100% by mass].

[0016] The propylene-based resin (A) according to the present invention can be produced by various known production methods. Specifically, when the propylene-based resin (A) contains only the propylene-based polymer (a-1), propylene is polymerized alone or, if necessary, propylene is polymerized with a small amount of α-olefin in the presence of a known olefin polymerization catalyst to obtain a propylene homopolymer. Specific examples of the olefin polymerization catalyst include titanium-based catalysts and metallocene-based catalysts. In particular, titanium-based catalysts are preferred.

[0017] <Ethylene-α-olefin copolymer (B)> The ethylene-α-olefin copolymer (B), which is one of the components contained in the propylene-based resin composition of the present invention, is a copolymer having a structural unit derived from ethylene as a main component. The α-olefin is preferably at least one α-olefin selected from the group consisting of α-olefins having 3 to 8 carbon atoms, more preferably at least one α-olefin selected from the group consisting of propylene, 1-butene, 1-hexene and 1-octene. Among them, 1-butene and 1-octene are particularly preferred.

[0018] The ethylene-α-olefin copolymer (B) according to the present invention has a content of ethylene-derived structural units in the range of 65 to 90 mol%, preferably 75 to 85 mol%. The ethylene-α-olefin copolymer (B) according to the present invention has a melt flow rate (MFR, 230°C, load 2.16 kg) measured by a method compliant with JIS K 7210, which is typically in the range of 0.1 to 60 g / 10 min, preferably 0.1 to 20 g / 10 min, and more preferably 0.5 to 10 g / 10 min.

[0019] <Antistatic agent (C)> The antistatic agent (C), which is one of the components contained in the propylene resin composition of the present invention, is a known antistatic agent used as an additive to plastics (resins), and is selected from the following surfactants.

[0020] Anionic surfactants such as fatty acid salts, higher alcohol sulfates, aliphatic amines, sulfates of amides, phosphate esters of aliphatic alcohols, alkylallyl sulfonates, and sulfonates of dibasic acid aliphatic esters: Cationic surfactants such as aliphatic amine salts, quaternary ammonium salts of alkylamine sulfates, and alkylpyridinium salts: Nonionic surfactants such as polyoxyethylene alkylphenol ethers, polyoxyethylene alkylamines, sorbitans (polyoxyethylene sorbitan alkyl esters), alkyldiethanolamines such as stearyldiethanolamine, and polyhydric alcohol fatty acid esters: Examples of surfactants include amphoteric surfactants such as alkyl betaine type and alkylimidazoline type.

[0021] <Polyhydric alcohol fatty acid esters> Polyhydric alcohol fatty acid esters, which are a type of antistatic agent (C) according to the present invention, specifically include glycerin fatty acid esters, diglycerin fatty acid esters, sorbitan fatty acid esters, sucrose fatty acid esters, alkyl glucosides, and polyhydric carboxylic acid esters. Among these, glycerin fatty acid esters and diglycerin fatty acid esters are preferred. Specific examples of glycerin fatty acid esters (i.e., fatty acid monoglycerides) include stearic acid monoglyceride, oleic acid monoglyceride, linolenic acid monoglyceride, lauric acid monoglyceride, palmitic acid monoglyceride, myristic acid monoglyceride, behenic acid monoglyceride, and margaric acid monoglyceride. Among these, stearic acid monoglyceride and oleic acid monoglyceride are preferred. Specific examples of diglycerol fatty acid esters (i.e., fatty acid diglycerides) include diglyceride stearate, diglyceride oleate, diglyceride linoleate, diglyceride laurate, diglyceride palmitate, diglyceride myristic acid, diglyceride behenate, and diglyceride margaric acid. Among these, diglyceride stearate and diglyceride oleate are preferred.

[0022] Among these surfactants, nonionic surfactants are preferred. Specifically, stearyldiethanolamine (product name: Electro Stripper TS-2, manufactured by Kao Corporation), Denon 3124 (product name: Marubishi Oil & Chemical Co., Ltd.), and Anstex SP-151 (product name: Toho Chemical Industry Co., Ltd.) are preferred.

[0023] <Propylene-based resin composition> The propylene resin composition of the present invention contains 70 to 99 parts by mass of the above-mentioned propylene resin (A), preferably 1 to 30 parts by mass, preferably 3 to 27 parts by mass, more preferably 5 to 25 parts by mass of the above-mentioned ethylene-α-olefin copolymer (B) [provided that the total amount of (A) + (B) is 100 parts by mass], and contains 0.1 to 0.5 parts by mass, preferably 0.13 to 0.47 parts by mass, more preferably 0.15 to 0.45 parts by mass of the above-mentioned antistatic agent (C) per 100 parts by mass of the total amount of (A) + (B), and if the antistatic agent (C) contains a polyhydric alcohol fatty acid ester, the amount of polyhydric alcohol fatty acid ester is 0.15 parts by mass or less. The propylene-based resin composition of the present invention exhibits excellent antistatic properties, glass haze properties, and low acrolein volatility, which are necessary for interior materials such as door trims.

[0024] <Inorganic fillers> The propylene resin composition of the present invention does not necessarily contain an inorganic filler, but if it does contain an inorganic filler, the amount of the filler is less than 5 parts by mass per 100 parts by mass of the total amount of the propylene resin (A) and the ethylene-α-olefin copolymer (B).

[0025] The inorganic filler according to the present invention is not particularly limited in type, and known inorganic fillers can be used. Specific examples of inorganic fillers include talc, mica, calcium carbonate, barium sulfate, glass fiber, gypsum, magnesium carbonate, magnesium oxide, titanium oxide, and iron oxide. Furthermore, metal powders or metal fibers made of metals such as zinc, copper, iron, and aluminum can also be used. Among these, talc, mica, calcium carbonate, and glass fiber are preferred, with talc being more preferred. The average particle size of talc is preferably 1 to 15 μm, more preferably 1 to 6 μm.

[0026] <Alkyl acid diethanolamide> The propylene-based resin composition of the present invention does not contain alkyl acid diethanolamides such as lauric acid diethanolamide, oleic acid diethanolamide, or stearic acid diethanolamide. Compositions containing alkyl acid diethanolamide exhibit poor fogging resistance in the resulting molded articles.

[0027] Other additives The propylene-based resin composition of the present invention may optionally contain other additives, such as heat stabilizers, weather stabilizers, light stabilizers, anti-aging agents, antioxidants, fatty acid metal salts, softeners, dispersants, colorants, pigments, UV absorbers, and nucleating agents, to the extent that they do not impair the objectives of the present invention.

[0028] <Method for producing propylene resin compositions> A propylene resin composition can be obtained by mixing the above components using a dry blender, Henschel mixer, Banbury mixer, or by melt-kneading the mixture after mixing using a single-screw extruder, twin-screw extruder, high-speed twin-screw extruder, etc.

[0029] <Molded body> The propylene resin composition of the present invention has excellent moldability and can be used in various molding methods. Specific examples of molded articles of the present invention include injection molded articles, foamed articles, injection foamed articles, extruded articles, blow molded articles, vacuum / pressure molded articles, calendered articles, stretched films, and inflation films. Injection molded articles are particularly preferred. The molding conditions when manufacturing the molded articles are not particularly limited, and known conditions can be used.

[0030] The molded article of the present invention has excellent moldability. Furthermore, because it contains a propylene resin (A), it has sufficient rigidity, and because it contains ethylene-α-olefin (B), it also has sufficient impact resistance. In addition, because it contains an antistatic agent (C), it has excellent antistatic properties, and because it has low volatility of acrolein and other substances, it has excellent fogging resistance.

[0031] The applications of the molded articles of the present invention are not particularly limited. Specific examples of preferred applications include automotive interior and exterior components such as door panels, pillar trims, door trims, door lower garnishes, and instrument panels; engine compartment components; other automotive parts; home appliance components; food containers; beverage containers; and medical containers. Among these, applications as automotive interior and exterior components (particularly automotive interior components) are preferred, and applications as automotive door components and pillar components are particularly preferred. [Examples]

[0032] The present invention will be described in more detail below based on examples. However, the present invention is not limited to these examples. The polymers used in the examples and comparative examples are shown below.

[0033] (1) Propylene resin (A) (1-1) Propylene resin (A-1): MFR: 70g / 10min. Propylene polymer (a-1-1): 89 parts by mass MFR: 150g / 10min, Content of constituent units derived from propylene: 99.9mol%. Propylene-ethylene copolymer (a-2-1): 11 parts by mass Intrinsic viscosity [η]: 3.3 dl / g, ethylene-derived constituent unit content: 39 mol%.

[0034] (1-2) Propylene resin (A-2): MFR: 60g / 10min. Propylene polymer (a-1-1): 89 parts by mass MFR: 60g / 10min, Content of constituent units derived from propylene: 99.9mol%. Propylene-ethylene copolymer (a-2-1): 11 parts by mass Intrinsic viscosity [η]: 6.2 dl / g, ethylene-derived constituent unit content: 39 mol%.

[0035] (2) Ethylene-α-olefin copolymer (B) (2-1) Ethylene-1-octene copolymer (B-1) MFR: 2.0g / 10min, Content of constituent units derived from ethylene: 80mol% [Dow Corporation, Product Name: ENGAGE] TM 8100]

[0036] (3) Antistatic agent (C) (3-1) Antistatic agent (C-1) Nonionic surfactant, complex type: Product name Denon 3124, manufactured by Marubishi Oil & Chemical Industry Co., Ltd. (3-2) Antistatic agent (C-2) Nonionic surfactant, complex type: Product name: Anstex SP-151, manufactured by Toho Chemical Industry Co., Ltd. (3-3) Antistatic agent (C-3) Stearyldiethanolamine (nonionic surfactant): Product name: Electro Stripper TS-2, manufactured by Kao Corporation. (3-4) Antistatic agent (C-4) Monoglycerides (nonionic surfactants): Product name: Electro Stripper TS-5 (manufactured by Kao Corporation)

[0037] (4) Alkyl acid diethanolamide (4-1) As the alkyl acid diethanolamide, lauric acid diethanolamide (F-1), trade name: Denon 2863, manufactured by Marubishi Oil & Chemical Co., Ltd. was used.

[0038] The physical properties of the propylene-based resin compositions obtained in the examples and comparative examples were measured by the following method.

[0039] [Volatility of acrolein] Test pieces measuring 100 x 100 x 2 mm in thickness, molded at a molding temperature of 240°C, were heated at 60°C for 2 hours seven days after molding. Volatile components generated during heating were quantitatively analyzed using a gas chromatograph with a QP-2010 Ultra (Shimadzu Corporation).

[0040] [Surface resistivity] A test piece measuring 100 x 100 x 2 mm in thickness was molded, and its surface resistivity was measured 7 days after molding in accordance with JIS K 6911:1995.

[0041] [Fogging] A test piece measuring 100 x 100 x 2 mm thick was molded, placed in a glass bottle 7 days after molding, sealed, and heated at 100°C for 2 hours. The gloss of the lid before and after heating was measured at a measurement angle of 60° in accordance with JIS Z 8741, and the rate of change in gloss was confirmed.

[0042] [Izod impact test] The Izod impact strength (J / m) was measured in accordance with ASTM D256 at a test temperature of 23°C.

[0043] [Bending test] The flexural modulus (MPa) was measured in accordance with ASTM D790 at a test temperature of 23°C and a test speed of 30 mm / min.

[0044] [MFR (Melt Flow Rate)] Measurements were taken in accordance with JIS K 7210, under conditions of a load of 2.16 kg and a temperature of 230°C.

[0045] [Example 1] A propylene resin composition was obtained by adding 0.30 parts by mass of an antistatic agent (C-1) to 95 parts by mass of a propylene resin (A-1), 5 parts by mass of an ethylene-1-octene copolymer (B-1), and a total of 100 parts by mass of (A-1) and (B-1), dry blending, and then melt extruding at 200°C using an extruder. The physical properties of the obtained propylene resin composition were measured by the method described above. The results are shown in Table 1.

[0046] [Examples 2-6] A propylene resin composition was obtained in the same manner as in Example 1, except that the type of propylene resin (A-1) and its amount, as listed in Table 1, were used instead of the propylene resin composition used in Example 1. The physical properties of the obtained propylene resin composition were measured by the method described above. The results are shown in Table 1.

[0047] [Table 1]

[0048] [Comparative Examples 1-4] A propylene resin composition was obtained in the same manner as in Example 1, except that the type of propylene resin (A-1) and its amount, as listed in Table 1, were used instead of the propylene resin composition used in Example 1. The physical properties of the obtained propylene resin composition were measured by the method described above. The results are shown in Table 2.

[0049] [Table 2] [Industrial applicability]

[0050] The propylene-based resin composition of the present invention is useful as a material for manufacturing various molded articles, such as injection-molded articles. The molded articles of the present invention are particularly useful as automotive interior and exterior components such as door panels and door trims.

Claims

1. The material contains 70 to 99 parts by mass of a propylene resin (A) containing the polymer described in (a-1) and (a-2) below, and 1 to 30 parts by mass of the ethylene-α-olefin copolymer (B) described below (provided that the total of the propylene resin (A) and the ethylene-α-olefin copolymer (B) is 100 parts by mass). The resin component comprises only the propylene-based resin (A) and the ethylene-α-olefin copolymer (B), and further The antistatic agent (C) is contained in an amount of 0.1 to 0.5 parts by mass per 100 parts by mass of the propylene resin (A) and the ethylene-α-olefin copolymer (B). The antistatic agent (C) is stearyldiethanolamine, and It does not contain alkyl acid diethanolamide, A propylene resin composition characterized by containing, as needed, an inorganic filler in an amount of 0 to less than 5 parts by mass per 100 parts by mass of the total of the propylene resin (A) and the ethylene-α-olefin copolymer (B). Propylene resin (A) (a-1) 70 to 100% by mass of a propylene polymer having a melt flow rate (MFR, 230°C, load 2.16 kg) measured in accordance with JIS K 7210 in the range of 10 to 300 g / 10 min, a content of constituent units derived from propylene in the range of 98 to 100 mol%, and a content of constituent units derived from ethylene and at least one α-olefin selected from α-olefins having 4 to 8 carbon atoms in the range of 0 to 2 mol% [provided that the total amount of (a-1) and (a-2) is 100% by mass]. (a-2) 0 to 30% by mass of a propylene-ethylene copolymer having an intrinsic viscosity [η] of 1.5 to 8 dl / g or less measured in decalin at 135°C, and containing 30 to 60 mol% of constituent units derived from ethylene [provided that the total amount of (a-1) and (a-2) is 100% by mass]. Ethylene-α-olefin copolymer (B) An ethylene-α-olefin copolymer comprising ethylene and at least one α-olefin selected from 1-butene and 1-octene, wherein the content of constituent units derived from ethylene is in the range of 65 to 90 mol%.

2. An automotive interior component comprising the propylene resin composition described in claim 1.

3. The automotive interior component according to claim 2, wherein the automotive interior component is an automotive door component.

4. A molded body obtained by injection molding the automotive interior member according to claim 2 or 3.

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