Alloy resin composition

Abstract

To provide an alloy resin composition having superior molding processability and a metallic luster.SOLUTION: An alloy resin composition comprises: a vinyl chloride-based resin (A); a (meth)acrylic resin (B); a luster agent (C); a lubricant (D); and a filler (E), wherein the content of the (meth)acrylic resin (B) is preferably 40 to 120 pts.mass relative to 100 pts.mass of the vinyl chloride-based resin (A), and the luster agent (C) is preferably composed of at least one of flaky aluminum powder and mica powder.SELECTED DRAWING: None

Description

Technical Field

[0001] The present invention relates to an alloy resin composition containing a vinyl chloride resin and an acrylic resin.

Background Art

[0002] Conventionally, alloy resins obtained by compounding vinyl chloride resins such as polyvinyl chloride and acrylic resins such as polymethyl methacrylate (PMMA) have been known. Patent Document 1 discloses an alloy resin composition suitable for manufacturing molded articles having excellent flame retardancy and high surface hardness.

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] The applications of molded articles of alloy resin compositions are diverse, and in some applications, it is required to give a metallic luster when viewed visually. As a result of investigations by the present inventors, it has been found that by blending a pigment (brightener) that reflects light into the alloy resin, a deep metallic luster (metallic three-dimensional effect) possessed by metals can be imparted. However, there were difficulties in the moldability of the alloy resin composition containing such a pigment.

[0005] The present invention provides an alloy resin composition having good moldability and a metallic luster.

Means for Solving the Problems

[0006] [1] An alloy resin composition containing a vinyl chloride resin (A), a (meth)acrylic resin (B), a brightener (C), a lubricant (D), and a filler (E). [2] The alloy resin composition according to [1], wherein the content of the (meth)acrylic resin (B) relative to 100 parts by mass of the vinyl chloride resin (A) is 40 to 120 parts by mass. [3] The alloy resin composition according to [1] or [2], wherein the brightening agent (C) is formed of at least one of flaky aluminum powder and mica powder. [4] The alloy resin composition according to any one of [1] to [3], wherein the lubricant (D) is at least one of a fatty acid salt having 10 or more carbon atoms and a fatty acid ester having 10 or more carbon atoms. [5] The alloy resin composition according to any one of [1] to [4], wherein the filler (E) is calcium carbonate powder. [6] The alloy resin composition according to any one of [1] to [5], wherein the content of the brightening agent (C) relative to 100 parts by mass of the vinyl chloride resin (A) is 5 to 10 parts by mass, the content of the lubricant (D) is 3 to 8 parts by mass, and the content of the filler (E) is 1 to 5 parts by mass. [7] The alloy resin composition according to any one of [1] to [6], wherein the vinyl chloride resin (A) contains a first vinyl chloride resin (a1) having an average degree of polymerization of 600 or more and 1300 or less. [8] The alloy resin composition according to any one of [1] to [7], wherein the vinyl chloride resin (A) contains a second vinyl chloride resin (a2) having an average degree of polymerization of 300 or more and less than 600. [9] The alloy resin composition according to any one of [1] to [8], further comprising a rubbery impact modifier.

[10] The alloy resin composition according to any one of [1] to [9], further comprising an ultraviolet absorber. [Effect of the Invention]

[0007] According to the present invention, an alloy resin composition having good moldability and a metallic luster can be provided. [Brief Description of the Drawings]

[0008]

Figure 1

Figure 2

Mode for Carrying Out the Invention

[0009] ≪Alloy Resin Composition≫ The first aspect of the present invention is an alloy resin composition containing a vinyl chloride resin (A), a (meth)acrylic resin (B), a brightening agent (C), a lubricant (D), and a filler (E).

[0010] <Vinyl Chloride Resin (A)> The vinyl chloride resin (A) is a polymer in which the proportion of repeating units derived from vinyl chloride (hereinafter also referred to as "vinyl chloride units") is more than 50% by mass based on the total mass of all repeating units. The vinyl chloride resin (A) may be a homopolymer of vinyl chloride, or may be a copolymer of vinyl chloride and one or more other vinyl monomers copolymerizable with vinyl chloride. When the vinyl chloride resin (A) is a copolymer, it may be a random copolymer, a block copolymer, or a graft copolymer. The vinyl chloride resin (A) can contain one or more vinyl chloride resins. The vinyl chloride resin (A) may be a so-called rigid vinyl chloride resin or a soft vinyl chloride resin. From the viewpoint of increasing the surface hardness of the molded product, a rigid vinyl chloride resin is preferred.

[0011] The proportion of vinyl chloride units in the vinyl chloride resin is preferably 75% by mass or more, more preferably 80% by mass or more, and even more preferably 85% by mass or more based on the total mass of all repeating units. The upper limit of the said proportion may be 100% by mass.

[0012] Examples of other vinyl monomers copolymerizable with vinyl chloride include vinyl fatty acid esters, acrylates, methacrylates, vinyl cyanide, vinyl ethers, α-olefins, unsaturated carboxylic acids or their acid anhydrides, vinylidene chloride, vinyl bromide, and various urethanes.

[0013] Examples of vinyl fatty acid esters include vinyl acetate, vinyl propionate, and vinyl laurate. Examples of acrylates include methyl acrylate, ethyl acrylate, and butyl acrylate. Examples of methacrylates include methyl methacrylate and ethyl methacrylate. Examples of vinyl cyanide include acrylonitrile and methacrylonitrile. Examples of vinyl ethers include vinyl methyl ether, vinyl butyl ether, and vinyl octyl ether. Examples of α-olefins include ethylene, propylene, and butylene. Examples of unsaturated carboxylic acids or their acid anhydrides include acrylic acid, methacrylic acid, and maleic anhydride.

[0014] The vinyl chloride resin (A) may contain only one type of vinyl chloride resin, or may contain two or more types of vinyl chloride resins having different average degrees of polymerization. Here, the average degree of polymerization is a value measured according to JIS K6720-2. For example, by containing two types, namely the first vinyl chloride resin (a1) and the second vinyl chloride resin (a2) as described below, the moldability and surface hardness of the alloy resin composition of this embodiment can be enhanced.

[0015] The average degree of polymerization of the first vinyl chloride resin (a1) is preferably 600 or more and 1300 or less, more preferably 650 or more and 900 or less, and even more preferably 700 or more and 800 or less. When it is at or above the above lower limit value, the mechanical strength of the molded product can be further enhanced. If it is below the above lower limit value, the moldability can be further improved.

[0016] The average degree of polymerization of the second vinyl chloride-based resin (a2) is preferably 300 or more and less than 600, more preferably 350 or more and 550 or less, and still more preferably 400 or more and 500 or less. If it is above the above lower limit value, the mechanical strength of the molded product can be further improved. If it is below the above lower limit value, the moldability can be further improved.

[0017] The difference in the average degree of polymerization between the first vinyl chloride-based resin (a1) and the second vinyl chloride-based resin (a2) is, for example, preferably 100 or more, more preferably 150 or more, and still more preferably 200 or more. If the difference in the average degree of polymerization is above the above lower limit value, the moldability can be further improved. The upper limit value of the difference in the average degree of polymerization is not particularly limited, and is preferably 700 or less.

[0018] The ratio of the vinyl chloride-based resin (A) to 100% by mass is, for example, 40 to 100% by mass of the first vinyl chloride-based resin (a1) and 0 to 60% by mass of the second vinyl chloride-based resin (a2), and it is preferable that the total of (a1) and (a2) is 100% by mass. If it is above the above lower limit value, the fluidity can be further improved and the moldability can be further improved. If it is below the upper limit value, the mechanical strength of the molded product can be further improved and the heat resistance of the molded product can be further improved.

[0019] <(meth)acrylic resin (B)> (Meth)acrylic resin (B) is a general term for methacrylic resin and acrylic resin, and means either one or both of them. The repeating unit derived from (meth)acrylate constituting the (meth)acrylic resin is 60% or more, preferably 75% or more, and more preferably 85% or more based on the total mass of all repeating units. Examples of methacrylate include methyl methacrylate, ethyl methacrylate, and butyl methacrylate. Examples of the acrylate include methyl acrylate, ethyl acrylate, and butyl acrylate. (The) (meth)acrylic resin (B) may be a homopolymer of (meth)acrylate or a copolymer of (meth)acrylate and other vinyl monomers. Examples of vinyl polymers other than (meth)acrylate are the same as those described above and are thus omitted. When the (meth)acrylic resin (B) is a copolymer, it may be a random copolymer or a block copolymer, except when the (meth)acrylic resin (B) is a copolymer with rubber. (The) (meth)acrylic resin (B) contained in the alloy resin composition of this embodiment may be one kind or two or more kinds.

[0020] When the (meth)acrylic resin (B) contains a methacrylic resin, the proportion of its methyl methacrylate unit is preferably 65% by mass or more, more preferably 75% by mass or more, and still more preferably 85% by mass or more based on the total mass of all repeating units. When the proportion of the methyl methacrylate unit is at least the above lower limit value, the surface hardness of the molded product can be further increased.

[0021] The weight average molecular weight of the (meth)acrylic resin (B) is preferably from 10,000 to 200,000, more preferably from 50,000 to 150,000, and still more preferably from 80,000 to 120,000. When it is at least the above lower limit value, the surface hardness of the molded product can be further increased. When it is at most the above upper limit value, the mechanical strength of the molded product can be further increased.

[0022] The number average molecular weight of the (meth)acrylic resin (B) is preferably from 5,000 to 100,000, more preferably from 20,000 to 85,000, and still more preferably from 35,000 to 70,000. When it is at least the above lower limit value, the surface hardness of the molded product can be further increased. When it is at most the above upper limit value, the mechanical strength of the molded product can be further increased.

[0023] The weight average molecular weight and number average molecular weight of the (meth)acrylic resin (B) are the average molecular weights in terms of polystyrene measured using gel permeation chromatography (GPC).

[0024] The melt flow rate (MFR) of the (meth)acrylic resin (B) measured according to JIS K7210-1 under the conditions of a temperature of 230°C and a load of 37.3 N is preferably 1.0 to 8.0 g / 10 min or more, more preferably 2.0 to 5.0 g / 10 min or more. When it is at the above lower limit value or more, the molding processability can be further enhanced. When it is at the above upper limit value or less, the heat resistance of the molded product can be further enhanced.

[0025] The load deflection temperature of the (meth)acrylic resin (B) is preferably, for example, 70 to 140°C, more preferably 80 to 120°C or less. When it is at the above lower limit value or more, the thermal stability is good and the deformation of the molded product can be reduced. When it is at the above upper limit value or less, the fluidity is good and the molding processability can be further enhanced. The above load deflection temperature can be measured according to JIS K7191.

[0026] The blending ratio of the (meth)acrylic resin (B) in the alloy resin composition of this embodiment is preferably 40 to 120 parts by mass, more preferably 50 to 100 parts by mass, and still more preferably 60 to 85 parts by mass with respect to 100 parts by mass of the vinyl chloride resin (A). When it is at the above lower limit value or more, the surface hardness of the molded product can be further enhanced. When it is at the above upper limit value or less, the molding processability can be further enhanced.

[0027] <Brightening agent (C)> The brightening agent (C) is a pigment having a light reflectivity capable of imparting a three-dimensional metallic luster to the alloy resin composition of this embodiment, and may be any that can be dispersed in the alloy resin composition. It is preferably formed by at least one of flaky aluminum powder and mica powder.

[0028] As the specific brightening agent (C), those commercially available as so-called pearl pigments (true pearl luster pigments) are preferred. Examples of pearl pigments include pearl essence, basic lead carbonate, lead arsenate, bismuth oxychloride, mica, etc. The surface of the pearl pigment may be coated with at least a part of a metal such as titanium oxide.

[0029] The type of the brightening agent (C) contained in the alloy resin composition of this embodiment may be one kind or two or more kinds. From the viewpoint of easily realizing a three-dimensional metallic luster, two or more kinds are preferred.

[0030] The total content ratio of the brightening agent (C) in the alloy resin composition of this embodiment is preferably 1 to 18 parts by mass, more preferably 3 to 15 parts by mass, and even more preferably 5 to 10 parts by mass with respect to 100 parts by mass of the vinyl chloride resin (A). When it is above the above lower limit value, a more three-dimensional metallic luster can be exhibited. When it is below the above upper limit value, the moldability can be further improved.

[0031] From the viewpoint of adjusting the color tone, the alloy resin composition of this embodiment may contain one or more other color agents different from the brightening agent (C). Examples of this color agent include inorganic pigments such as carbon black, titanium oxide, titanium yellow, and lead yellow; organic pigments such as azo-based, benzimidazolone-based, diarylide-based, quinacridone-based, isoindolinone-based, vat-based, phthalocyanine-based, and dioxane-based. Among these, at least one of carbon black and titanium oxide is preferred because it is easy to adjust the shade of the metallic luster of the pearl pigment to a high-class metallic luster.

[0032] <Lubricant (D)> The lubricant (D) is an additive that exhibits excellent slipperiness to the constituent members of molding devices such as molds and rollers when molding the alloy resin composition of this embodiment by extrusion molding or injection molding, thereby improving the moldability.

[0033] As the specific lubricant (D), at least one of fatty acid salts having 10 or more carbon atoms and fatty acid esters having 10 or more carbon atoms is preferable. As the fatty acids constituting these fatty acid salts and fatty acid esters, for example, aliphatic monocarboxylic acids such as stearic acid (18 carbon atoms), palmitic acid (16 carbon atoms), behenic acid (22 carbon atoms), montanic acid (28 carbon atoms) are preferable. The number of carbon atoms of the aliphatic monocarboxylic acid is preferably 14 to 40, more preferably 16 to 34. The counter cation constituting the fatty acid salt is preferably an alkali metal or an alkaline earth metal. The fatty acid ester is preferably a fatty acid alkyl ester. The alkyl group constituting the fatty acid alkyl ester is preferably linear, and the number of carbon atoms thereof is preferably 1 to 40, more preferably 5 to 30, and even more preferably 10 to 20.

[0034] Examples of lubricants other than fatty acid salts and fatty acid esters include ethylene vinyl acetate copolymers, metal soaps, natural waxes such as carnauba wax and candelilla wax, and petroleum waxes such as paraffin wax.

[0035] The type of the lubricant (D) contained in the alloy resin composition of this embodiment may be one kind or two or more kinds. From the viewpoint of further improving the moldability, two or more kinds are preferable. When using a fatty acid salt and a fatty acid ester in combination, the content mass m1 of the fatty acid salt is preferably more than the content mass m2 of the fatty acid ester (m1>m2). Here, the content ratio (mass basis) represented by m1 / m2 is preferably 1.5 to 7.0, more preferably 2.0 to 6.0, and even more preferably 3.0 to 5.0.

[0036] The total content ratio of the lubricant (D) in the alloy resin composition of this embodiment is preferably 1 to 10 parts by mass, more preferably 2 to 9 parts by mass, even more preferably 3 to 8 parts by mass, and most preferably 4 to 7 parts by mass with respect to 100 parts by mass of the vinyl chloride resin (A). When it is in the above range, the moldability can be further improved.

[0037] <Filler (E)> As the filler (E), those generally used as fillers for resin compositions can be applied. By containing the filler (E) together with the lubricant (D) in the alloy resin composition of this embodiment, its moldability is enhanced.

[0038] As a result of the inventors' intensive studies, by blending the filler (E), when heating and kneading the alloy resin composition of this embodiment, the dispersibility of the brightening agent (C) in the alloy resin composition is enhanced, or the adhesion of the brightening agent (C) to the mold of an extrusion molding machine or an injection molding machine is suppressed. It has been found that the effect of enhancing the moldability of the alloy resin composition of this embodiment can be obtained.

[0039] As a specific filler (E), carbonates are preferable. Examples of carbonates include magnesium carbonate, calcium carbonate, and dawsonite. Among these, from the viewpoint of further enhancing the moldability, heavy calcium carbonate obtained by pulverizing limestone is preferable.

[0040] The type of the filler (E) contained in the alloy resin composition of this embodiment may be one kind or two or more kinds. The content mass M1 of the filler (E) contained in the alloy resin composition of this embodiment is preferably less than the content mass M2 of the lubricant (D) (M1 < M2). Here, the content ratio (mass basis) represented by M2 / M1 is preferably 1.5 to 5.0, more preferably 1.8 to 4.0, and even more preferably 2.0 to 3.0.

[0041] The total content ratio of the filler (E) in the alloy resin composition of this embodiment is preferably 0.1 to 10 parts by mass, more preferably 0.3 to 7.0 parts by mass, even more preferably 0.5 to 5.0 parts by mass, and most preferably 1.0 to 3.0 parts by mass with respect to 100 parts by mass of the vinyl chloride-based resin (A). Within the above range, the moldability can be further enhanced.

[0042] From the perspective of enhancing the metallic luster feeling of the alloy resin composition of this aspect while further improving the moldability, with respect to 100 parts by mass of the vinyl chloride-based resin (A), the content of the brightening agent (C) is preferably 5 to 10 parts by mass, the content of the lubricant (D) is preferably 3 to 8 parts by mass, and the content of the filler (E) is preferably 1 to 5 parts by mass.

[0043] The alloy resin composition of this aspect can be added with various known additives such as heat stabilizers, light stabilizers, antioxidants, ultraviolet absorbers, impact modifiers, processing aids, plasticizers, antifouling agents, etc., as long as the effects of the present invention are not impaired.

[0044] From the perspective of enhancing the impact resistance, it is preferable to add a rubbery impact modifier to the alloy resin composition of this aspect. The content of the impact modifier is preferably, for example, 1 to 30 parts by mass with respect to 100 parts by mass of the vinyl chloride-based resin (A).

[0045] From the perspective of enhancing the weather resistance, it is preferable to add an ultraviolet absorber to the alloy resin composition of this aspect. The content of the ultraviolet absorber is preferably, for example, 0.1 to 3 parts by mass with respect to 100 parts by mass of the vinyl chloride-based resin (A).

[0046] The shape of the alloy resin composition of this aspect is not particularly limited, and examples include pellet shapes that are easy to apply to various resin processing methods.

[0047] <Manufacturing Method> The alloy resin composition of this aspect can be manufactured by kneading each component by a known method in the same manner as known resin compositions. Examples of the method of kneading and molding each component include methods of kneading alone or in combination a ribbon blender, a Henschel mixer, a Banbury mixer, a single-screw extruder, a twin-screw extruder, a conical extruder, an injection molding machine, etc.

[0048] <Molded Article> A molded article is a thing obtained by molding the alloy resin composition of this aspect into a shape suitable for a specific use. By using the alloy resin composition of this embodiment, a desired molded product having a metallic luster can be easily manufactured using a known extrusion molding machine or injection molding machine.

Examples

[0049] <PVC-based resin (A)> · PVC-based resin (a1): First vinyl chloride-based resin (proportion of vinyl chloride units: 87% by mass, average degree of polymerization: 700). · PVC-based resin (a2): Second vinyl chloride-based resin (proportion of vinyl chloride units: 90% by mass, average degree of polymerization: 500).

[0050] <Acrylic resin (B)> · Acrylic resin (b1): Methyl methacrylate-based resin, trade name "Acrypet VH-001", manufactured by Mitsubishi Chemical Corporation, proportion of methyl methacrylate units: 90% by mass, weight average molecular weight: 92,000, number average molecular weight: 55,000, deflection temperature under load: 100 °C, MFR (JIS K 7210-1, temperature 230 °C, load 37.3 N): 2.0 g / 10 min.

[0051] <Brightening agent (C)> · Pearl pigment (c1): Scaly mica (particle size 20 μm to 100 μm, manufactured by Merck) · Pearl pigment (c2): Scaly mica (particle size 5 μm to 25 μm, manufactured by Merck) · Pearl pigment (c3): Scaly mica (particle size 20 μm to 100 μm, manufactured by Nippon Kogaku Kogyo Co., Ltd.)

[0052] <Lubricant (D)> · Lubricant (d1): Higher fatty acid salt: Fatty acid salt having 10 or more carbon atoms (manufactured by Sakai Chemical Industry Co., Ltd.) · Lubricant (d2): Stearyl stearate: Stearyl ester of stearic acid

[0053] <Filler (E)> · Filler (e1): Calcium carbonate: Heavy calcium carbonate (manufactured by Shiraishi Calcium Co., Ltd., product name: Whiton)

[0054] <Others> · Impact modifier: silicone acrylic rubber (manufactured by Mitsubishi Chemical Corporation, product name: Metablen, model number: S-2001) · Ultraviolet absorber (UVA): benzotriazole-based compound (manufactured by BASF Japan Ltd., product name: Tinuvin) · Light stabilizer (HALS): non-basic (manufactured by BASF Japan Ltd., product name: Tinuvin) · Stabilizer 1: mono- and dimethyltin mercapto-based compound (manufactured by Katsuta Chemical Co., Ltd.) · Stabilizer 2: calcium zinc-based (manufactured by ADEKA Corporation, product name: Adeka Stab) · Antioxidant: phenolic antioxidant (manufactured by SONGWON Co., Ltd., product name: SONGNOX) · Processing aid: high molecular weight acrylic polymer (manufactured by Mitsubishi Chemical Corporation, product name: Metablen, weight average molecular weight: 150×10 4 ) · Pigment: carbon black (manufactured by DIC Corporation, product name: Plastron) · PC resin: polycarbonate resin (manufactured by Sumika Polycarbonate Ltd., product name: SD POLYCA)

[0055] [Preliminary composition] With the formulation described in Table 1, using PVC-based resins (a1) and PVC-based resins (a2) as the base resins, and based on 100 parts by mass of the base resins, the materials described in the table (excluding acrylic resin (b1)) were blended to obtain a preliminary composition. Note that the blanks in Table 1 indicate no blending.

[0056] [Example 1] Based on 100 parts by mass of the PVC-based resin contained in the preliminary composition, with the formulation described in Table 1, acrylic resin (b1) was kneaded with the PVC-based resin at a barrel temperature of 200°C to 250°C (resin temperature 200°C or higher) and the PVC-based resin at a barrel temperature of 160 - 200°C (resin temperature 200°C or lower) in the same direction using a twin-screw extruder, and then extrusion molding was performed through a cooling water tank, a pelletizing device, and a drying and sorting machine to obtain pellet-shaped molded products as alloy resin pellets. Next, using these pellets, plate-shaped performance evaluation molded products were produced by injection molding.

[0057] [Examples 2 - 5, Comparative Examples 1 - 3] Using the formulations in Table 1, in the same manner as in Example 1, the preliminary composition was subjected to extrusion molding to obtain pellet - shaped molded articles as alloy resin pellets. Plate - shaped performance - evaluation molded articles were produced by injection molding.

[0058] [Comparative Examples 4 - 5] Using an acrylic resin (b1) or a polycarbonate resin as the base resin, with the formulations in Table 1, a black pigment and a pearl pigment were subjected to extrusion molding to obtain molded articles of resin pellets. Plate - shaped performance - evaluation molded articles were produced by injection molding in the same manner as in Example 1.

[0059] [Performance Evaluation] [Metallic Three - Dimensional Sense] The molded articles were visually inspected and evaluated according to the following two - level criteria. The results are shown in Table 1. “〇”: Compared with “△”, there was more three - dimensional light reflection and sufficient metallic luster. “△”: It showed light reflection, but lacked three - dimensional sense and had little metallic luster. The above - mentioned three - dimensional light reflection was considered to be affected by the dispersibility of the pearl pigment in the molded article.

[0060] [Extrusion Processability] Regarding extrusion molding, it was evaluated according to the following four - level criteria. The results are shown in Table 1. “◎”: There was no roughness on the surface of the extruded pellet - shaped molded article, and no adhesion of the pearl pigment to the extrusion machine was observed. The extrusion processability was excellent. “〇”: There was almost no roughness on the surface of the extruded pellet - shaped molded article, and little adhesion of the pearl pigment to the extrusion machine was observed. The extrusion processability was good. “△”: There was roughness on the surface of the extruded pellet - shaped molded article, but it was less severe compared to “×” and the molding was slightly difficult. Also, adhesion of the pearl pigment to the extrusion machine was observed. Overall, the extrusion processability was inferior. "×": The surface of the extruded pellet molded product had a bumpy roughness, making molding difficult. In addition, a large amount of pearl pigment adhered to the extrusion processing machine. Overall, the extrusion processability was very poor.

[0061]

Table 1

[0062] For the molded products of each example, the following performance evaluations were further carried out. Unless otherwise specified, plate-shaped molded products obtained in the same manner as in Example 1 were used. The evaluation results are shown in Table 2.

[0063] [Impact resistance] According to JIS K7111-1, the Charpy impact strength (unit: kJ / m 2 ) was measured, and based on the measured value, it was evaluated in four grades: "◎": excellent, "〇": good, "△": fair, "×": poor.

[0064] [Weather resistance] After performing 500 hours of accelerated treatment using a sunshine weather meter, referring to JIS Z8730, L * a * b * The color difference (△E) in the L*a*b* color system was quantitatively measured. The smaller the value of △E, the smaller the color difference. The smaller the color difference, the less the deterioration, and it can be evaluated that the weather resistance is excellent.

[0065] [Heat resistance] According to JIS K7191, the heat distortion temperature (unit: °C) was measured, and based on the measured value, it was evaluated in four grades: "◎": excellent, "〇": good, "△": fair, "×": poor.

[0066] [Flame retardancy] The flame retardancy of the alloy resin composition was evaluated by the UL94V 20 mm vertical combustion test in accordance with ASTM D3801. Specifically, test pieces with a length of 125 mm, a width of 13 mm, and a thickness of 3 mm were formed using the alloy resin composition produced in each example. The test piece was placed above the burner with its longitudinal direction being the vertical direction, and the test piece was subjected to two 10-second flame contact with a 20 mm flame. Based on the combustion behavior, the evaluation was carried out in four grades: "V-0": excellent, "V-1": good, "V-2": acceptable, and "NG": unacceptable.

[0067] [Chemical resistance] The test for chemical resistance (solvent resistance) by the bending form method was carried out as follows. As shown in FIG. 1, a plate-shaped test piece 10 with a thickness of 1.5 mm, a width of 30 mm, and a length of 125 mm was prepared and stored in a desiccator for one day. As shown in FIG. 2, a jig 100 having a shape in which an elliptic cylinder with a major axis 2a of 254 mm and a minor axis 2b of 76.2 mm was cut into four parts by a plane passing through the minor axis and a plane passing through the major axis was placed on a horizontal plane with the minor axis (b = 38.1 mm) in the vertical direction, the major axis (a = 127 mm) in the horizontal direction, and the curved surface 110 facing upward. A strip-shaped gauze 20 containing ethanol for disinfection (76.9 to 81.4% by volume at 15°C) was placed at the central part in the width direction on the upper surface of the stored test piece 10 so as to extend in the length direction of the test piece 10. The gauze 20 on the test piece 10 was covered with a polymer wrap (registered trademark) which is a film 30. With the first edge 10a in the length direction of the test piece 10 in this state aligned with the edge 110a on the minor axis side of the curved surface 110 of the jig 100, the test piece 10 was bent so that the lower surface of the test piece 10 was in close contact with the curved surface 110 of the jig 100, and left standing for 24 hours under the conditions of 23°C and 50% RH. After standing, the test piece 10 was removed from the jig 100, and the lengthwise distance between the end closest to the first edge 10a of the crack generated in the test piece 10 and the first edge 10a was defined as d (mm), and the critical strain ε (%) was calculated from the following formula (1). The above measurement was performed on three formed test pieces, and the average value (%) of the critical strain ε was obtained. In formula (1), t is the thickness (mm) of the test piece 10. The average value is shown in Table 2. In addition, when the crack generation distance d at a thickness of 1.5 mm is 111 mm or more, the critical strain ε was set to "1% or more". It can be said that the greater the critical strain ε obtained above, the better the chemical resistance. In this test, the evaluation was carried out in four grades: "◎": excellent, "〇": good, "△": fair, and "×": poor.

[0068] [Number] In formula (1), t is the thickness of the test piece 10 (unit: mm).

[0069] [Thermal stability] The molded products of each example were placed in an oven at a set temperature of 190 °C and heated for 30 minutes. After taking out the molded products from the oven, the appearance of the molded products was visually observed, and the static thermal stability was evaluated based on the following evaluation criteria. ○: There is no discoloration and the appearance is good. △: There are yellow discolored parts. ×: There are brown discolored parts (burn marks).

[0070] [Flexural strength] The flexural strength (unit: MPa) was measured in accordance with JIS K7171.

[0071] [Flexural modulus] The flexural modulus (unit: MPa) was measured in accordance with JIS K7171.

[0072] [Pencil hardness] The pencil hardness was measured in accordance with JIS K5600-5-4.

[0073] [Table 2]

[0074] As shown in Tables 1 and 2, in Examples 1 to 5 to which the alloy resin composition according to the present invention was applied, the evaluation of the extrusion processability was good or better, and the evaluation of the metallic three-dimensional feeling was also good. Since Example 5 does not contain an impact modifier, the impact resistance evaluation was inferior, but the extrusion processability and metallic three-dimensional effect were good. Comparative Examples 1 to 3 contained lubricant (D) but did not contain filler (E), so the extrusion processability was inferior. In Comparative Example 3, since it contained a relatively large amount of the second PVC-based resin with a low molecular weight, the extrusion processability was slightly improved, but it was inferior to the Examples containing filler (E) in terms of extrusion processability. Comparative Examples 4 to 5 did not contain vinyl chloride-based resin (A), so the characteristics of the acrylic resin or polycarbonate as the base resin were reflected (the acrylic resin has poor flame retardancy. The polycarbonate has low surface hardness).

Claims

1. An alloy resin composition comprising a vinyl chloride resin (A), a (meth)acrylic resin (B), a brightening agent (C), a lubricant (D), and a filler (E).

2. The alloy resin composition according to Claim 1, wherein the content of the (meth)acrylic resin (B) relative to 100 parts by mass of the vinyl chloride resin (A) is 40 to 120 parts by mass.

3. The alloy resin composition according to Claim 2, wherein the brightening agent (C) is formed of at least one of scaly aluminum powder and mica powder.

4. The alloy resin composition according to Claim 3, wherein the lubricant (D) is at least one of a fatty acid salt having 10 or more carbon atoms and a fatty acid ester having 10 or more carbon atoms.

5. The alloy resin composition according to Claim 4, wherein the filler (E) is calcium carbonate powder.

6. Relative to 100 parts by mass of the vinyl chloride resin (A), the content of the brightening agent (C) is 5 to 10 parts by mass, the content of the lubricant (D) is 3 to 8 parts by mass, and the content of the filler (E) is 1 to 5 parts by mass. The alloy resin composition according to Claim 5.

7. The alloy resin composition according to Claim 6, wherein the vinyl chloride resin (A) contains a first vinyl chloride resin (a1) having an average degree of polymerization of 600 or more and 1300 or less.

8. The alloy resin composition according to Claim 7, wherein the vinyl chloride resin (A) further contains a second vinyl chloride resin (a2) having an average degree of polymerization of 300 or more and less than 600.

9. The alloy resin composition according to Claim 8, further comprising a rubbery impact modifier.

10. The alloy resin composition according to Claim 9, further comprising an ultraviolet absorber.

Images