Molding resin composition

Abstract

The objective of this invention is to develop an organically modified layered clay mineral dispersant that exhibits excellent moldability and provides superior mechanical strength to molded products. [Solution] A dispersant (α) for organic layered clay minerals containing an acid-modified polyolefin (X) having an acid value (unit: mgKOH / g) of 20 to 250. An organic layered clay mineral-containing composition (Y) containing the dispersant (α) for organic layered clay minerals and an organic layered clay mineral (F). A molding resin composition (Z) containing the dispersant (α) for organic layered clay minerals, an organic layered clay mineral (F), and a polyolefin resin (E).

Description

Technical Field

[0001] The present invention relates to a resin composition for molding.

Background Art

[0002] It is common to add an inorganic filler to a thermoplastic resin to enhance the function of the thermoplastic resin. Conventionally, as a technique for dispersing an inorganic filler, a resin composition containing a polyamide elastomer, a styrene resin, and an inorganic filler has been proposed (Patent Document 1, etc.).

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] However, even with the above technology, the moldability and the mechanical strength of the molded product are not sufficiently satisfactory, and improvement has been demanded. An object of the present invention is to develop a dispersant for an organic layered clay mineral that is excellent in moldability and gives excellent mechanical strength to a molded product.

Means for Solving the Problems

[0005] As a result of investigations to achieve the above object, the present inventors have reached the present invention. That is, the present invention is a dispersant (α) for an organic layered clay mineral containing an acid-modified polyolefin (X) having an acid value (unit: mgKOH / g) of 20 to 250.

Effects of the Invention

[0006] The resin composition for molding (Y) containing the dispersant (α) for an organic layered clay mineral of the present invention exhibits the following effects. (1) Excellent moldability (resin fluidity, etc.). (2) Excellent mechanical strength (flexural modulus, etc.). [Modes for carrying out the invention]

[0007] <Acid-modified polyolefin (X)> Examples of the acid-modified polyolefin (X) in the present invention include those made from polyolefin (A) and unsaturated (poly)carboxylic acid (B), as described later. The acid value (unit: mgKOH / g) of the acid-modified polyolefin (X) is 20 to 250, preferably 30 to 200, and more preferably 40 to 180. When the acid value is less than 20, the moldability tends to be poor, and when it exceeds 250, the mechanical strength tends to be poor.

[0008] The acid value can be adjusted, for example, by the weight ratio of polyolefin (A) to unsaturated (poly)carboxylic acid (B) [(A) / (B)].

[0009] The acid value here is the value obtained by measuring it according to the following procedure (i) to (iii) in accordance with JIS K0070. (i) Dissolve 1 g of (X) in 100 g of xylene that has been heated to 100°C. (ii) Titration is performed at the same temperature using phenolphthalein as an indicator with a 0.1 mol / L potassium hydroxide ethanol solution [product name "0.1 mol / L ethanolic potassium hydroxide solution", manufactured by Wako Pure Chemical Industries, Ltd.]. (iii) Convert the amount of potassium hydroxide required for titration to mg and calculate the acid value (unit: mgKOH / g). Furthermore, the above measurement yielded results in which one acid anhydride group was equivalent to one carboxyl group. The acid value in the examples described later was determined according to this method.

[0010] The Mn of (X) is preferably 1,000 to 70,000, more preferably 1,500 to 60,000, and particularly preferably 2,000 to 50,000.

[0011] <Polyolefin (A)> In the present invention, polyolefin (A) is a polyolefin having double bonds in the molecular terminals and / or molecular chains. Polyolefin (A) is preferably obtained by thermally degrading polyolefin (A0), as described below, by a thermal degradation method (hereinafter referred to as thermal degradation method, for example, the manufacturing method described in Japanese Patent Publication No. 43-9368 and Japanese Patent Publication No. 44-29742).

[0012] Furthermore, (A) has double bonds at its molecular ends and / or in its molecular chains, from the viewpoint of copolymerization with the unsaturated (poly)carboxylic acid (anhydride) (B) described later. The number of double bonds in the molecular terminals and / or molecular chains per 1,000 carbon atoms (also known as 1,000 carbon atoms) of (A) is preferably 0.1 to 20, more preferably 0.3 to 18, and particularly preferably 0.5 to 15.

[0013] Here, the number of double bonds is (A) 1 This can be determined from the spectrum obtained by 1H-NMR (nuclear magnetic resonance) spectroscopy. Specifically, the peaks in the spectrum are assigned, and the relative values ​​of the number of double bonds in (A) and the number of carbon atoms in (A) are determined from the integral values ​​originating from the double bonds in (A) at 4.5-6 ppm and from (A), and the number of double bonds in the molecular ends and / or molecular chains of (A) per 1,000 carbon atoms is calculated. The number of double bonds in the examples described later was determined according to this method.

[0014] Thermal desorption methods include (1) a method of thermal desorption of polyolefin (A0) in the absence of organic peroxides, for example at 300-450°C for 0.5-10 hours, and (2) a method of thermal desorption in the presence of organic peroxides [e.g., 2,5-dimethyl-2,5-di(t-butylperoxy)hexane], for example at 180-300°C for 0.5-10 hours. Of these, the preferred method from the viewpoint of copolymerizability between (A) and (B) is method (1), which makes it easier to obtain a molecule with a larger number of double bonds at the molecular ends and / or in the molecular chain.

[0015] Mn in (A) is preferably from 900 to 50,000, more preferably from 1,000 to 45,000.

[0016] The measurement conditions for the number average molecular weight (Mn) and weight average molecular weight (Mw) by GPC in the present invention are as follows. Apparatus: High-temperature gel permeation chromatograph [“Alliance GPC V2000”, manufactured by Waters Corporation] Solvent: Orthodichlorobenzene Standard substance: Polystyrene Sample concentration: 3 mg / ml Column stationary phase: PLgel 10 μm, two MIXED-B columns in series [manufactured by Polymer Laboratories, Ltd.] Column temperature: 135 °C

[0017] The polyolefin (A0) includes one or more (co)polymers of olefins, and copolymers of one or more olefins and one or more other monomers. The above olefins include alkenes having 2 to 30 carbon atoms [in the present invention, may be abbreviated as C], such as ethylene, propylene, 1- and 2-butene, and isobutene, and C5 - 30 α-olefins (1-hexene, 1-decene, 1-dodecene, etc.); the other monomers include C4 - 30 unsaturated monomers having copolymerizability with olefins, such as vinyl acetate.

[0018] Specific examples of (A0) include ethylene unit-containing (propylene unit-free) (co)polymers, such as high, medium, and low-density polyethylene, and copolymers of ethylene with C4-30 unsaturated monomers [butene (1-butene, etc.), C5-30 α-olefins (1-hexene, 1-dodecene, etc.), vinyl acetate, etc.] (weight ratio is preferably 30 / 70 to 99 / 1, more preferably 50 / 50 to 95 / 5); propylene unit-containing (ethylene unit-free) (co)polymers, such as polypropylene, copolymers of propylene with C4-30 unsaturated monomers (same as above) (weight ratio is the same as above); ethylene / propylene copolymers (weight ratio is preferably 0.5 / 99.5 to 30 / 70, more preferably 2 / 98 to 20 / 80); and (co)polymers of C4 or higher olefins, such as polybutene. Of these, polyethylene, polypropylene, ethylene / propylene copolymer, and propylene / C4-30 unsaturated monomer copolymer are preferred from the viewpoint of polymerizability with polyolefins (A) and unsaturated (poly)carboxylic acids (anhydride) (B) described later, and ethylene / propylene copolymer and propylene / C4-30 unsaturated monomer copolymer are even more preferred.

[0019] The number-average molecular weight of (A0) [hereinafter abbreviated as Mn. Measurement is performed by the gel permeation chromatography (GPC) method described later. The same applies hereinafter.] is preferably 30,000 to 400,000, and more preferably 50,000 to 200,000.

[0020] <Unsaturated (poly)carboxylic acid (anhydride) (B)> In the present invention, the unsaturated (poly)carboxylic acid (anhydride) (B) is a C3-30 (poly)carboxylic acid (anhydride) having one polymerizable unsaturated group. In the present invention, the unsaturated (poly)carboxylic acid (anhydride) means an unsaturated monocarboxylic acid, an unsaturated polycarboxylic acid, and / or an unsaturated polycarboxylic acid anhydride.

[0021] Examples of (B) include unsaturated monocarboxylic acids such as aliphatic monocarboxylic acids (C3-24, e.g., acrylic acid, methacrylic acid, α-ethylacrylic acid, crotonic acid, isocrotonic acid), alicyclic monocarboxylic acids (C6-24, e.g., cyclohexenecarboxylic acid); and unsaturated poly(2-3 or more)carboxylic acids (anhydrides) such as unsaturated dicarboxylic acids (anhydrides) [aliphatic dicarboxylic acids (anhydrides) (C4-24, e.g., maleic acid, fumaric acid, itaconic acid, citraconic acid, mesaconic acid, and their anhydrides), alicyclic dicarboxylic acids (anhydrides) (C8-24, e.g., cyclohexenedicarboxylic acid, cycloheptenedicarboxylic acid, bicycloheptenedicarboxylic acid, methyltetrahydrophthalic acid, and their anhydrides)]. (B) may be used alone or in combination of two types. Of these, unsaturated dicarboxylic acid anhydrides are preferred from the viewpoint of polymerization with polyolefin (A), and maleic anhydride is even more preferred.

[0022] Furthermore, the forms of acid-modified polyolefins (X) include the following: [1] A graft copolymer with (A) as the trunk and (B) as the branches. [2] A random copolymer of (A) and (B). The above-described form [1] can be formed by heating and melting (A) and (B) in the presence of a radical polymerization initiator (d), preferably a peroxide, or by suspending or dissolving them in a suitable organic solvent, and further adding a chain transfer agent (t) and a polymerization inhibitor (f) as necessary, and heating and stirring. The above-described form [2] can be formed by heating and melting (A) and (B) in the presence of a radical polymerization initiator (d), preferably an azo compound, or by suspending or dissolving them in a suitable organic solvent, and then adding a chain transfer agent (t) and a polymerization inhibitor (f) as necessary, and heating and stirring.

[0023] Furthermore, the forms of acid-modified polyolefins (X) include the following: [3] A graft copolymer with (A) as the trunk and (B), or (B) and the α-olefin (C) described below, as branches. The above-described form [3] can be formed by heating and melting (A), (B), and (C) in the presence of a radical polymerization initiator (D), preferably a peroxide, or by suspending or dissolving them in a suitable organic solvent, and further adding a chain transfer agent (t) and a polymerization inhibitor (f) as necessary, and heating and stirring.

[0024] The α-olefin (C) is preferably an α-olefin having 6 to 36 carbon atoms (preferably 8 to 30), and examples include 1-hexene, 1-octene, 1-nonene, 1-decene, and mixtures of two or more of these.

[0025] <Dispersant for organically modified layered clay minerals (α)> The dispersant (α) for organically modified layered clay minerals of the present invention contains the acid-modified polyolefin (X). In addition to (X), the dispersant (α) may also contain other additives (G). Based on the weight of (α), the weight of (X) is preferably 90% by weight or more, more preferably 95% by weight or more, and particularly preferably 96-99.5% by weight. This dispersant (α) for organic layered clay minerals can suitably disperse organic layered clay minerals in polyolefin resins, and therefore it is presumed to have excellent moldability and mechanical strength.

[0026] Furthermore, the number (γ) of carboxylic acid (anhydride) groups per molecule of the acid-modified polyolefin (X) is preferably 2.0 to 30.0. This (γ) can be calculated using the following formula. (γ) = [Mn of (X) × Acid value of (X)] / 56100

[0027] In the dispersant (α) for organically modified layered clay minerals, the acid-modified polyolefin (X) may be used alone or in combination of two or more types. For example, dispersibility is improved by using in combination an acid-modified polyolefin (X1) with an acid value (unit: mgKOH / g) of 20 to 100 (preferably 20 to 90) and an acid-modified polyolefin (X2) with an acid value (unit: mgKOH / g) greater than 100 and 250 or less (preferably 110 to 250). In this case, the weight ratio of (X1) to (X2) [(X1) / (X2)] is preferably 90 / 10 to 10 / 90.

[0028] <Organic layered clay mineral (F)> In this invention, the organically modified layered clay mineral (F) refers to a layered clay mineral that has been organically modified with organic onium ions. Here, the layered clay mineral refers to a so-called layered silicate. Examples include smectite-type layered clay minerals such as montmorillonite, saponite, hectorite, byderite, stevensite, and nontronite, as well as vermiculite, halloysite, and swelling mica. These can be natural or synthetic.

[0029] As the organic onium ion, compounds having one or more long-chain molecules with 12 or more carbon atoms are preferred. Representative compounds include, for example, stearylammonium salts with 18 carbon atoms. Having 12 or more carbon atoms allows for control of the hydrophilicity of the organic onium ion, which is preferable from the viewpoint of compatibility of the organic layered clay mineral with polyolefin oligomers and polyolefin resins.

[0030] The cation content of the layered clay mineral is preferably 50 to 200 mmol / 100g. A cation content of 50 mmol / 100g or more and 200 mmol / 100g or less is preferable because it improves the affinity between the organic layered clay mineral and the polyolefin resin, allowing the organic layered clay mineral to be sufficiently dispersed in the polyolefin resin and providing a sufficient reinforcing effect.

[0031] Examples of commercially available products include Esben, Esben C, Esben E, Esben W, Esben WX, Esben N-400, Esben NX, Esben NX80, Esben NE, Esben NZ (product names, all manufactured by Hojun Co., Ltd.); Kunibis-110, Kunibis-127, Smecton-SAN (product names, all manufactured by Kunimine Industries Co., Ltd.); Somasif MAE, Somasif MTE (product names, all manufactured by Katakura Coop Agri Co., Ltd.).

[0032] <Polyolefin resin (E)> In the present invention, the polyolefin resin (E) may be those exemplified as polyolefin (A0), and may be used alone or in combination of two or more types. Of the above polyolefin resins (E), polyethylene, polypropylene, and ethylene / propylene copolymer are preferred, and polypropylene and ethylene / propylene copolymer are more preferred. The number-average molecular weight (Mn) of the polyolefin resin (E) is preferably 30,000 to 400,000, and more preferably 50,000 to 200,000.

[0033] <Organic layered clay mineral-containing composition (Y)> The organic layered clay mineral-containing composition (Y) of the present invention comprises the organic layered clay mineral dispersant (α) and the organic layered clay mineral (F). Based on the total weight of the organic layered clay mineral dispersant (α) and the organic layered clay mineral (F), preferably (α) is 2 to 98% by weight and (F) is 2 to 98% by weight, and more preferably (α) is 10 to 90% by weight and (F) is 10 to 90% by weight.

[0034] The organic layered clay mineral-containing composition (Y) can be produced, for example, by one of the following methods (1) or (2). (1) Mix the dispersant for organic layered clay minerals (α) and the organic layered clay mineral (F). (2) When reacting polyolefin (A) with unsaturated (poly)carboxylic acid (B) to obtain acid-modified polyolefin (X), organic layered clay mineral (F) is added before or during the reaction.

[0035] <Molding resin composition (Z)> The molding resin composition (Z) of the present invention comprises the organic layered clay mineral dispersant (α), the organic layered clay mineral (F), and a polyolefin resin (E). Based on the total weight of the organic layered clay mineral dispersant (α), the organic layered clay mineral (F), and the polyolefin resin (E), preferably (α) is 0.1 to 5% by weight, (F) is 0.1 to 5% by weight, and (E) is 90 to 99.5% by weight, and more preferably (α) is 0.3 to 3% by weight, (F) is 0.3 to 3% by weight, and (E) is 94 to 99% by weight.

[0036] The composition may, as necessary and within the limits that do not impair the effects of the present invention, contain, in addition to (α), (E), and (F), at least one other additive (G) selected from the group consisting of colorants, release agents, antioxidants, flame retardants, ultraviolet absorbers, antibacterial agents, compatibilizers, fillers, and antistatic enhancers, as shown below. Each of these (G) may be a single type or a combination of two or more types.

[0037] Colorants (G1) include inorganic pigments [white pigments, etc.], organic pigments [azo pigments, polycyclic pigments, etc.], dyes [azo-based dyes, etc.], etc.

[0038] Examples of release agents (G2) include lower (C1-C4) alcohol esters of higher fatty acids (as mentioned above) (such as butyl stearate), polyhydric (2-C4 or higher) alcohol esters of fatty acids (C2-C18) (such as hydrogenated castor oil), glycol (C2-C8) esters of fatty acids (C2-C18) (such as ethylene glycol monostearate), liquid paraffin, etc.

[0039] Antioxidants (G3) include phenolic compounds [monocyclic phenols (2,6-di-t-butyl-p-cresol, etc.), bisphenols [2,2'-methylenebis(4-methyl-6-t-butylphenol), etc.], polycyclic phenols [1,3,5-trimethyl-2,4,6-tris(3,5-di-t-butyl-4-hydroxybenzyl)benzene, etc.]], sulfur compounds (dilauryl 3,3'-thiodipropionate, etc.), phosphorus compounds (triphenyl phosphite, etc.), amine compounds (octylated diphenylamine, etc.), etc.];

[0040] Examples of flame retardants (G4) include halogen-containing flame retardants, nitrogen-containing flame retardants, sulfur-containing flame retardants, silicon-containing flame retardants, phosphorus-containing flame retardants, etc.

[0041] Examples of UV absorbers (G5) include benzotriazole [2-(2'-hydroxy-5'-methylphenyl)benzotriazole, etc.], benzophenone [2-hydroxy-4-methoxybenzophenone, etc.], salicylate [phenyl salicylate, etc.], acrylate [2-ethylhexyl-2-cyano-3,3'1-diphenylacrylate, etc.], etc.

[0042] Antimicrobial agents (G6) include benzoic acid, sorbic acid, halogenated phenols, organic iodine, nitriles (2,4,5,6-tetrachloroisophthalonitrile, etc.), thiocyanosides (methylenebisthianocyanate), N-haloalkylthioimide, copper compounds (8-oxyquinoline copper, etc.), benzimidazole, benzothiazole, trihaloallyl, triazole, organic nitrogen sulfur compounds (Slaoff 39, etc.), quaternary ammonium compounds, pyridine compounds, etc.

[0043] Examples of compatibilizers (G7) include modified vinyl polymers having at least one functional group (polar group) selected from the group consisting of carboxyl groups, epoxy groups, amino groups, hydroxyl groups, and polyoxyalkylene groups: for example, the polymer described in Japanese Patent Publication No. 3-258850, the modified vinyl polymer having a sulfonic acid group described in Japanese Patent Publication No. 6-345927, and block polymers having a polyolefin portion and an aromatic vinyl polymer portion;

[0044] Examples of fillers (G8) include organic fillers (urea, calcium stearate, etc.).

[0045] Examples of antistatic agents (G9) include surfactants such as ethylene oxide (EO) adducts of higher alcohols (C8-18) (molecular weight 158 ​​or higher, Mn less than 20,000), saturated fatty acid sodium salts of C8-22, and lauryltrimethylammonium chloride.

[0046] The total content of (G) based on the weight of the polyolefin resin (E) is, for example, 45% by weight or less, preferably 0.001 to 40% by weight, more preferably 0.01 to 35% by weight, from the viewpoint of the effect of each additive and the mechanical properties of the molded article; the content of each (G) is, from the same viewpoint, preferably 0.1 to 3% by weight for (G1), more preferably 0.2 to 2% by weight; preferably 0.01 to 3% by weight for (G2), more preferably 0.05 to 1% by weight; preferably 0.01 to 3% by weight for (G3), more preferably 0.05 ~1% by weight; (G4) is preferably 0.5 to 20% by weight, more preferably 1 to 10% by weight; (G5) is preferably 0.01 to 3% by weight, more preferably 0.05 to 1% by weight; (G6) is preferably 0.5 to 20% by weight, more preferably 1 to 10% by weight; (G7) is preferably 0.5 to 10% by weight, more preferably 1 to 5% by weight; (G8) is preferably 0.5 to 10% by weight, more preferably 1 to 5% by weight; (G9) is preferably 0.1 to 3% by weight, more preferably 0.3 to 2% by weight.

[0047] The molding resin composition (Z) of the present invention can be obtained, for example, by the following method. (i): Melt and mix (α), (F), (E), and any other additives (G) as needed. (ii): After melting and mixing (α) and (F) beforehand [the composition (Y)], the other components are melted and mixed. (iii): After pre-melting and mixing a portion of (α), (F), and (E), the remaining components are melted and mixed. Generally, a method of melt-mixing can be applied in which each component, in pellet or powder form, is mixed in a suitable mixer (such as a Henschel mixer), and then melt-mixed in an extruder to form pellets.

[0048] The melt flow rate (m) (hereinafter abbreviated as MFR) of the molding resin composition (Z) of the present invention is preferably 5 to 50 g / 10 min, and more preferably 5 to 40 g / 10 min, from the viewpoint of moldability. Here, MFR is a numerical value representing the melt viscosity of the resin; a higher value indicates lower melt viscosity. The MFR was measured in accordance with JIS K 7210 (230°C, 2.16 kg load).

[0049] <Molded products> The molded article of the present invention is a molded article of the resin composition (Y). That is, it is obtained by molding the resin composition (Y). Examples of molding methods include injection molding, compression molding, calendering, slush molding, rotational molding, extrusion molding, blow molding, and film molding (casting method, tenter method, and inflation method, etc.).

[0050] The resin composition (Y) of the present invention and its molded articles exhibit excellent moldability and mechanical strength. For this reason, they are extremely useful for various resin molded products, particularly for electronic and electrical equipment, transport materials, and everyday goods. [Examples]

[0051] The following describes embodiments of the present invention, but the present invention is not limited to these embodiments. In the following, "parts" refers to parts by weight.

[0052] <Manufacturing Example 1> 100 parts of polyolefin (A0-1) [product name "Sun Allomer PZA20A", manufactured by Sun Allomer Co., Ltd., Mn 100,000, hereinafter the same], consisting of 98 mol% propylene and 2 mol% ethylene as constituent units, were charged into a reaction vessel. The mixture was heated and melted using a mantle heater while nitrogen was passed through the gas phase, and thermal reduction was carried out at 360°C for 70 minutes with stirring to obtain polyolefin (A-1). (A-1) had 7.2 double bonds per 1,000 carbon atoms at the molecular ends and / or in the molecular chain, and a Mn of 3,000.

[0053] <Manufacturing Examples 2-6> In Production Example 1, the process was carried out in the same manner as in Production Example 1, except that thermal reduction was performed according to Table 1, to obtain each polyolefin (A). The results are shown in Table 1.

[0054] [Table 1]

[0055] <Manufacturing Example 7> 100 parts of (A-1) were charged into a reaction vessel and heated to 180°C under nitrogen aeration until uniformly melted. Eight parts of maleic anhydride (B-1) were then charged and dissolved. A solution of two parts of dicumyl peroxide [trade name "Perkmyl D", manufactured by NOF Corporation] (D-1) dissolved in four parts of xylene was added dropwise over 10 minutes, and stirring was continued at 180°C for 3 hours. After that, xylene and unreacted maleic anhydride were removed by distillation under reduced pressure (1.5 kPa, the same applies hereafter) to obtain acid-modified polyolefin (X-1). (X-1) had an acid value of 41, a manganese content of 4,000, and the number of carboxylic acid (anhydride) groups (γ) per molecule of acid-modified polyolefin (X) was 2.9.

[0056] <Manufacturing Examples 8-10, 13-14, Comparative Manufacturing Example 1> In Production Example 7, the procedure was carried out in the same manner as in Production Example 7, except that the raw materials used were as specified in Table 2, to obtain each acid-modified polyolefin (X). The results are shown in Table 2.

[0057] <Manufacturing Example 11> 100 parts of (A-1), 24 parts of acrylic acid (B-2), 23.6 parts of 1-decene (C-1), and 100 parts of xylene were charged into a reaction vessel. After purging with nitrogen, the mixture was heated to 130°C under nitrogen aeration to dissolve uniformly. A solution of 0.5 parts of dicumyl peroxide [trade name "Perkmyl D", manufactured by NOF Corporation] (d-1) dissolved in 10 parts of xylene was added dropwise over 10 minutes, and stirring was continued under reflux of xylene for 3 hours. After that, xylene and unreacted maleic anhydride were removed by distillation under reduced pressure (1.5 kPa, the same applies hereafter) to obtain acid-modified polyolefin (X-5). (X-5) had an acid value of 124, a manganese value of 4,900, and a (γ) value of 10.8.

[0058] <Manufacturing Example 12, Comparative Manufacturing Example 2> In Production Example 11, the procedure was carried out in the same manner as in Production Example 11, except that the raw materials used were as specified in Table 2, to obtain each acid-modified polyolefin (X). The results are shown in Table 2.

[0059] [Table 2]

[0060] <Example 1> 100 parts of (X-1) were charged into a reaction vessel, and under nitrogen aeration, the mixture was heated to 180°C and uniformly melted and kneaded to obtain (α-1), an organic dispersant for layered clay minerals containing (X-1). The results are shown in Table 3.

[0061] <Examples 2-11, Comparative Examples 1-2> In Example 1, the procedure was carried out in the same manner as in Example 1, except that the raw materials used were as shown in Table 3, to obtain each organic dispersant (α) for layered clay minerals. The results are shown in Table 3.

[0062] <Comparative Example 3> For comparison, 100 parts of the polyolefin (A-1) obtained in Production Example 1 were used as an organic dispersant for layered clay minerals (ratio α-3).

[0063] [Table 3]

[0064] <Example 12> Fifty parts of organic layered clay mineral dispersant (α-1) and fifty parts of organic layered clay mineral (F-1) [product name "Esben NX", manufactured by Hojun] were blended for 3 minutes each in a Henschel mixer [product name "Henschel Mixer FM150L / B", manufactured by Mitsui Mining Co., Ltd., and later Nippon Coke Industries Co., Ltd.]. The mixture was then melt-kneaded in a vented twin-screw extruder at 180°C, 100 rpm, and residence time of 5 minutes to obtain organic layered clay mineral-containing composition (Y-1).

[0065] <Examples 13-24, Comparative Examples 4-6> In Example 12, each organic layered clay mineral-containing composition (Y) was obtained in the same manner as in Example 12, except that the composition (parts) was as shown in Table 4. The results are shown in Table 4.

[0066] [Table 4]

[0067] <Examples 25-37, Comparative Examples 7-10> According to the compound composition (parts) shown in Table 5, the organic layered clay mineral-containing composition (Y) and polyolefin resin (E) were blended in a Henschel mixer for 3 minutes. Then, the mixture was melt-kneaded in a vented twin-screw extruder at 180°C, 100 rpm, and residence time of 5 minutes to obtain each molding resin composition (Z). Each obtained resin composition (Z) was molded using an injection molding machine "PS40E5ASE" [manufactured by Nissei Plastic Industrial Co., Ltd.] at a cylinder temperature of 220°C and a mold temperature of 50°C to create predetermined test pieces, which were then evaluated according to the <Evaluation Method> described below. The results are shown in Table 5.

[0068] <Evaluation Method> 1. MFR (unit: g / 10min) Measurements were taken in accordance with JIS K7210 (230°C, 2.16 kg load).

[0069] 2. Flexural modulus (unit: MPa) The bending elasticity was evaluated by measurement in accordance with JIS K7171.

[0070] [Table 5]

[0071] The results in Tables 1-5 show that the organic dispersant (α) for layered clay minerals of the present invention exhibits superior moldability of the molding resin composition (Z) and superior mechanical strength of the molded product compared to the comparative one. [Industrial applicability]

[0072] The organically modified layered clay mineral dispersant (α) of the present invention results in a molding resin composition (Z) with excellent moldability and superior mechanical strength of the molded product. Therefore, it can be widely used as a material for housing products [for home appliances, office equipment, game consoles, and office equipment, etc.] molded by various molding methods [injection molding, compression molding, calendering, slush molding, rotational molding, extrusion molding, blow molding, foam molding, and film molding (e.g., casting method, tenter method, and inflation method)], plastic container materials [trays used in clean rooms (IC trays, etc.), other containers, etc.], various cushioning materials, covering materials (packaging films, protective films, etc.), flooring sheets, artificial turf, mats, tape substrates (for semiconductor manufacturing processes, etc.), and various molded products (automobile parts, etc.), making it extremely useful.

Claims

1. A dispersant (α) for organic layered clay minerals, comprising an acid-modified polyolefin (X) having an acid value (unit: mgKOH / g) of 20 to 250.

2. The organic dispersant (α) for layered clay minerals according to claim 1, wherein the acid-modified polyolefin (X) is composed of a polyolefin (A) and an unsaturated (poly)carboxylic acid (B).

3. The dispersant (α) for organically modified layered clay minerals according to claim 1, wherein the number (γ) of carboxylic acid (anhydride) groups per molecule of the acid-modified polyolefin (X) is 2.0 to 30.

0.

4. A composition (Y) containing an organic layered clay mineral, comprising the organic layered clay mineral dispersant (α) described in claim 1 and the organic layered clay mineral (F).

5. The organic layered clay mineral-containing composition (Y) according to claim 4, wherein (α) is 2 to 98% by weight and (F) is 2 to 98% by weight, based on the total weight of the organic layered clay mineral dispersant (α) and the organic layered clay mineral (F).

6. A molding resin composition (Z) comprising the organic layered clay mineral dispersant (α) described in claim 1, an organic layered clay mineral (F), and a polyolefin resin (E).

7. The molding resin composition (Z) according to claim 6, wherein (α) is 0.1 to 5% by weight, (F) is 0.1 to 5% by weight, and (E) is 90 to 99.5% by weight, based on the total weight of the organic layered clay mineral dispersant (α), the organic layered clay mineral (F), and the polyolefin resin (E).

8. The molding resin composition (Z) according to claim 6, wherein the melt flow rate (m) measured under conditions of 230°C and 2.16 kgf is 5 to 50 g / 10 min.

9. A molded article obtained by molding the molding resin composition (Z) described in claim 6.

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