JPH11158294A - Manufacturing method of molded body - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain a polyolefin resin compsn. which has a good moldability and can be molded without causing scorching, burns or the like, by incorporating a specified amt. of a basic metal soap into a polyolefine resin compsn. contg. a lignocellulosic or a cellulosic substance. SOLUTION: The objective polyolefin resin compsn. is prepd. by mixing (A) a polyolefin resin, (B) a lignocellulosic or a cellulosic substance in an amt. of 20 wt.% or higher of the compsn., 0.005-1 wt.% (based on the sum of A and B, the same applies hereunder) org. peroxide (e.g. benzoyl peroxide), 0.1-10 wt.% modified polyolefine, 0.1-20 wt.% polybasic acid anhydride (e.g. maleic anhydride), and a basic metal soap (e.g. zinc stearate) in an amt. of 0.005-5 wt.% of the compsn. at 150-260 deg.C with an extruder or the like. Resin A is pref. a mixture of polypropylene having a melt flow rate of 0.1-200 g/10 min and a polyethylene having a melt flow rate of 0.01-200 g/10 min in a wt. ratio of (40/60)-(90/10).

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to scorching or burning when a polyolefin resin composition containing a lignocellulosic or cellulosic material represented by a woody material is molded by extrusion molding, injection molding or the like. The present invention relates to a molding method that enables continuous production for a long period of time by preventing the occurrence of a long-term continuous production.

[0002]

2. Description of the Related Art Conventionally, it has been widely practiced to mix a wood-based material as a filler with a thermosetting resin such as a melamine resin or a phenol resin to obtain a composite material having improved appearance and elasticity. In addition, blending of a wood-based material with a thermoplastic resin such as polyolefin has been considered, but a hydrophilic wood-based material has low affinity for a hydrophobic polyolefin, and the thermal fluidity of the resin composition is low. There is a problem that the molding processability is reduced due to a decrease, or the mechanical strength is reduced in some cases.

[0003] As a method for solving such problems and improving the affinity between a wood-based material and a polyolefin, for example, a method comprising a polyolefin and a vegetable fiber, wherein the polyolefin is a mixture of an unmodified polyolefin and a modified polyolefin. (A) thermoplastic resin, (B) a vegetable filler, and (C) an inorganic filler treated with an unsaturated carboxylic acid. And (D) a modified polyolefin as a compatibilizer, such as a thermoplastic composite resin composition comprising a polyolefin modified with a liquid rubber and an unsaturated carboxylic acid or a derivative thereof (JP-A-56-167743). How to add resin or thermoplastic resin, and cellulose, lignin, and hemicelluloe that make up wood Thermoplastic resin composition obtained by melting and mixing modified wood obtained by substituting at least a part of the hydrogen atom of the hydroxyl group with an aliphatic acyl group having 3 or more carbon atoms and / or a long-chain alkyl group (Japanese Patent Publication No. 1-59302) Japanese Patent Application Laid-Open No. H10-260, as well as a method for imparting affinity to a thermoplastic resin to a wood-based material by performing a chemical treatment on wood.

[0004] Further, when a polypropylene resin is used as a thermoplastic resin, it has been proposed to improve the thermal fluidity by blending an organic peroxide, for example, a propylene resin, a vegetable fiber, A resin composition containing a specific amount of a modified propylene-based resin and an organic peroxide is reacted under heating to obtain a resin composite (JP-B-62-51).
No. 86, Japanese Patent Publication No. 122297, Japanese Patent Publication No. 5-
No. 60502).

[0005] By the above-mentioned method, it has become possible to some extent to process a polyolefin resin composition containing a lignocellulosic or cellulosic substance represented by a woody material. However, when these resin compositions are molded, a phenomenon in which a part of the composition adheres to the inside of a molding machine or a mold is observed. This starts to appear as fogging in short-time operation, and if the operation is continued for a long time, the inside of the molding machine and the portion adhered to the mold are thermally degraded, causing burns and burns. If left unattended, there is a problem that the part is peeled off during operation and is mixed into the molded body.
And such a tendency became remarkable so that heat fluidity was improved. Therefore, the only countermeasure was to stop the operation and clean frequently.

On the other hand, a so-called lubricant has conventionally been used for the purpose of (1) preventing the generation of frictional heat during mixing and kneading of a thermoplastic resin, (2) improving the fluidity during molding, and (3) preventing adhesion to a machine wall. Is widely used. Lubricants used for such purposes include paraffin wax, fatty acid amides and barium stearate,
Metal soaps such as calcium stearate, zinc stearate and magnesium stearate are well known,
For example, when molding polyolefin mixed with wood flour, to prevent heat storage due to frictional heat at the time of kneading, to produce a thick molded product without decomposition of wood flour melting point 200 ° C. or more Incorporation of a lubricant (specifically, barium stearate) (Japanese Patent Application Laid-Open No. 8-100886)
Has been proposed. However, even if such a lubricant was added, the above-mentioned eye-burning, scorching, and kogation could not be prevented.

[0007]

DISCLOSURE OF THE INVENTION The present invention solves the above-mentioned problems and has good moldability when molding a polyolefin-based resin composition containing a lignocellulosic or cellulosic substance. It is an object of the present invention to provide a method for producing a molded article capable of preventing the occurrence of burns, burns, and the like even after a long continuous operation.

[0008]

Means for Solving the Problems As a result of intensive studies, the present inventors have found that a basic metallic soap is blended with a polyolefin resin composition containing a lignocellulose-based or cellulosic-based material and then molded and processed. The inventors have found that the problems described above can be solved, and have reached the present invention.

That is, the present invention is the following method for producing a molded article.

(1) When molding a polyolefin-based resin composition containing a lignocellulose-based or cellulosic substance, the basic metal soap (F) is added in an amount of 0.005 to 5.0% by weight based on the resin composition. %.

(2) The method according to claim 1, wherein the polyolefin resin composition contains at least 20% by weight of a lignocellulosic or cellulosic substance.

(3) The above-mentioned polyolefin resin composition has an organic peroxide (C) 0 based on the total amount of polyolefin (A), lignocellulosic or cellulosic substance (B), and (A) (B). 3. The method for producing a molded article according to claim 1, wherein 0.005 to 1% by weight and modified polyolefin (D) 0.1 to 10% by weight are kneaded with heat.

(4) The polyolefin-based resin composition has an organic peroxide (C) 0 based on the total amount of the polyolefin (A), the lignocellulosic or cellulosic substance (B), and (A) (B). 3. The method for producing a molded article according to claim 1, wherein 0.005 to 1% by weight and a polybasic acid anhydride (E) 0.5 to 20% by weight are kneaded with heat.

(5) The polyolefin-based resin composition is a lignocellulosic or cellulosic material (B)
And polybasic acid anhydride (E) are heated and kneaded to form an esterified lignocellulosic or cellulosic substance (B '), and then polyolefin (A) and organic peroxide (C)
5. The method for producing a molded article according to claim 4, wherein the composition is heated and kneaded.

(6) The polyolefin (A) has a melt flow rate of 0.1 to 200 g / 10 min (ASTMD1
238, temperature 230 ° C., load 2.16 kg) and a melt flow rate of 0.01 to 200 g / 1.
0 min (ASTMD1238, temperature 190 ° C, load 2.1
6 to 6 kg) of polyethylene.
The method for producing a molded article according to any one of the above.

[0016]

Embodiments of the present invention will be described below in detail.

The polyolefin used as the component (A) in the polyolefin resin composition containing a lignocellulosic or cellulosic substance of the present invention is a homopolymer or copolymer of an α-olefin having 2 to 20 carbon atoms. is there. Specific examples of the polyolefin (A) include polyethylene, polypropylene, polybutene, poly-4-methyl-1-pentene, and the like.
These may be a homopolymer or a copolymer of two or more α-olefins. Other examples include an ethylene / propylene copolymer, an ethylene / α-olefin copolymer, and a propylene / α-olefin copolymer. The polyolefin (A) can be used alone or as a mixture of two or more kinds at an arbitrary mixing ratio.

Particularly, in the present invention, it is preferable to use a mixture of polypropylene and polyethylene as the polyolefin (A), and the preferable mixing ratio is polypropylene: polyethylene = 40-90: 60-1 by weight ratio.
It is in the range of 0. The preferred melt flow rate (MFR) is 0.1 to 200 for polypropylene.
g / 10 minutes (ASTMD1238, temperature 230 ° C, load 2.16 kg), 0.01 to 20 in the case of polyethylene
0 g / 10 min (ASTMD1238, temperature 190 ° C, load 2.16 kg).

As the lignocellulosic or cellulosic substance (B), any substance containing lignocellulose, cellulose or a derivative thereof, which has been conventionally used as a resin filler, can be used without limitation. . The component (B) is a so-called wood material (hereinafter, the component (B) may be referred to as a wood material), and specific examples thereof include wood flour and wood pulp. The log and tree species of these woody materials are not particularly limited. In addition, as a wood-based material, wood material obtained from wood material as an industrial waste in the wood industry, such as sander powder generated when particle board is polished, or wood material obtained from unused wood material can be used. You can also use it. Further, those obtained by neutralizing wood acid (lepulinic acid, acetic acid, formic acid, etc.) with urea or the like can also be used. As the component (B), one type can be used alone, or two or more types can be used in combination. At this time, the content of the lignocellulosic or cellulosic substance (B) in the polyolefin resin composition is 20% by weight or more, especially 30% by weight.
It is preferable that the content be not less than% by weight.

In the present invention, any polyolefin-based resin composition containing the above-mentioned polyolefin (A) and a lignocellulosic or cellulosic substance (B) as essential components can be used without any particular limitation. It is preferable to use a polyolefin resin composition having excellent heat fluidity. For example, a polyolefin-based resin composition obtained by heating and kneading a polyolefin (A), a lignocellulose-based or cellulosic substance (B), an organic peroxide (C), and a modified polyolefin (D) can satisfy such an object. Things. In this case, the heating and kneading conditions are 150 to 260 ° C., preferably 1 to 260 ° C.
10 seconds to 30 minutes at 70 to 230 ° C, preferably 30 seconds to
5 minutes, and the mixing ratio of the organic peroxide (C) is 0.005 to 1% by weight based on the total amount of (A) and (B).
Preferably 0.008 to 0.1% by weight, modified polyolefin (D) 0.1 to 10% by weight, preferably 0.5 to 8%.
% By weight.

Another preferable example is a mixture obtained by heating and kneading a polyolefin (A), a lignocellulosic or cellulosic substance (B), an organic peroxide (C) and a polybasic acid anhydride (E). No. in this case,
It is of course possible to simultaneously blend (A), (B), (C) and (E) and knead them by heating, but it is also possible to previously prepare a lignocellulosic or cellulosic substance (B) and a polybasic acid anhydride (E). ) Is heated and kneaded to form an esterified lignocellulosic or cellulosic substance (B ′), and then a mixture obtained by blending a polyolefin (A) and an organic peroxide (C) and kneading the mixture is used. preferable. The heating and kneading conditions for obtaining (B ′) are 120 to 260 ° C., preferably 140 to 230 ° C., for 10 seconds to 30 minutes, preferably 3 to 30 minutes.
The conditions for heating and kneading (B ′), (A) and (C) are 150 to 260 ° C., preferably 170 ° C.
The temperature is from 10 seconds to 30 minutes, preferably from 30 seconds to 5 minutes at ~ 230 ° C. The mixing ratio of the organic peroxide (C) and the polybasic acid anhydride (E) is such that the organic peroxide (C) is 0.005 to 1% by weight based on the total amount of (A) and (B). , Preferably 0.008 to 0.1% by weight, and the polybasic acid anhydride (E) is 0.5 to 20% by weight, preferably 0.5 to 15% by weight.

The organic peroxide (C) used to obtain the above-mentioned polyolefin resin composition includes organic peroxides such as dialkyl peroxide, diacyl peroxide, hydroperoxide and ketone peroxide; Organic peresters; peroxydicarbonate and the like can be used without any particular limitation.

Specific examples of the organic peroxide (C) include benzoyl peroxide, dichlorobenzoyl peroxide, dicumyl peroxide, di-t-butyl peroxide, and 2,5-dimethyl-2,5-di (peroxy Benzoate) hexine-3,1,3-bis (t-butylperoxyisopropyl) benzene, lauroyl peroxide, t-butylperacetate, 2,5-dimethyl-2,5-di (t-butylperoxy) hexine-
3,2,5-dimethyl-2,5-di (t-butylperoxy) hexane, t-butylperoxybenzoate,
t-butyl peroxyphenyl acetate, t-butyl peroxyisobutyrate, t-butyl peroxyse
Examples thereof include c-octate, t-butyl peroxypivalate, cumyl peroxypivalate, t-butylperoxydiethyl acetate, and the like. Among these, dicumyl peroxide, t-butylperoxybenzoate, 2,5-dimethyl-2,5-di (t-butylperoxy) hexane, and 1,3-bis (t-butylperoxyisopropyl) benzene are preferred. . Such organic peroxides (C) can be used alone or in combination of two or more.

The modified polyolefin (D) is modified with a modifying compound such as maleic anhydride, dimethyl maleate, diethyl maleate, acrylic acid, methacrylic acid, tetrahydrophthalic acid, glycidyl methacrylate, hydroxyethyl methacrylate, and the like. And polyolefins. Examples of the polyolefin before modification include those similar to the polyolefin (A). The amount (modification amount) of the modifying compound introduced to the polyolefin before modification is 0.1 to 20% by weight, preferably 0.5 to 10% by weight.

In particular, it is preferable to use the modified polyolefin (D) in combination with the same type of modified polyolefin used as the component (A).
That is, when the polyolefin of the component (A) is polypropylene, it is preferable to mix modified polypropylene as the modified polyolefin.

Further, as the polybasic acid anhydride (E), for example, maleic anhydride, phthalic anhydride, succinic anhydride, tetrahydrophthalic anhydride, hexahydrophthalic anhydride,
Examples include itaconic anhydride and adipic anhydride. Among these, industrially inexpensive maleic anhydride, phthalic anhydride, succinic anhydride and the like are preferable. Such polybasic acid anhydrides (E) can be used alone, or
Two or more can be used in combination.

In the above-mentioned polyolefin resin composition, the modified polyolefin (D) improves the affinity between the polyolefin (A) and the lignocellulosic or cellulosic substance (B), and improves the moldability and mechanical strength. To contribute. Further, when the polybasic acid anhydride (E) is blended, the polyolefin (A) is modified at the time of heating and kneading, or the esterification reaction of the lignocellulosic or cellulosic substance (B) occurs, and the polyolefin (A) is mixed with the polyolefin (A). It is presumed that the interfacial bonding with the lignocellulosic or cellulosic substance (B) is improved and the strength is improved. Further, by heating and kneading in the presence of the organic peroxide (C), the heat fluidity of the polyolefin resin composition is improved, and when the polybasic acid anhydride (E) is used, the polybasic acid anhydride is used. It is considered to contribute to the modification of the polyolefin (A) with the product (E).

Further, the polyolefin resin composition used in the present invention may contain, if necessary, an inorganic filler such as talc, calcium carbonate, mica, glass fiber or the like, or an organic filler such as polyester or polyamide fiber. Of course, it is also possible to add other components such as various additives such as a flame retardant, a stabilizer, an ultraviolet absorber, an antioxidant, and a plasticizer, and a coloring agent such as a dye and a pigment.

The method of heating and kneading such a polyolefin resin composition is not particularly limited as long as it can be heated and kneaded under the above conditions. For example, a blender, a kneader, a mixing roll, a Banbury mixer, a single screw or twin screw extruder It can be performed by such as. The following method can be exemplified as a preferred kneading method. That is, the set temperature of the kneading zone is set to the above-mentioned temperature by a twin-screw extruder and kneading is performed, and the composition is reacted in a kneaded state to obtain a polyolefin resin composition. If the temperature exceeds 260 ° C., a gas is generated due to the decomposition of the lignocellulosic or cellulosic substance (B), so that care must be taken so that the granulation temperature does not exceed 230 ° C. For this reason, it is preferable to use a twin-screw extruder or the like with which cooling control is effective.

In the present invention, it is necessary to mix a basic metal soap (F) when producing a molded article from the above-mentioned polyolefin resin composition.

The basic metal soap (F) is composed of an aliphatic monocarboxylic acid (hereinafter referred to as "fatty acid") and periodic table I.
It is obtained by heating and reacting a group I metal oxide or hydroxide (hereinafter referred to as a metal inorganic compound) by a dry direct method which is a kind of a known production method. The difference is that while a known metal soap reacts a fatty acid with a reaction equivalent of a metal inorganic compound,
The basic metal soap of the present invention is obtained by adding a fatty acid and a reaction equivalent or more of an excess of a metal-inorganic compound and completely reacting the reaction product so that the reaction product becomes transparent. The melting point and acid value are naturally different. At this time, the excess amount of the metal inorganic compound is 0.1 to 1.0 mol, and preferably 0.1 to 0.8 mol. When the excess amount is less than 0.1 mol, there is not much difference between the conventional metal soap and the performance thereof, and when it exceeds 1.0 mol, the melt of the product does not become transparent and unreacted. It is not preferable because the metal inorganic compound remains.

The fatty acid used as a raw material of the basic metal soap (F) is at least one kind of a natural or synthetic saturated or unsaturated monocarboxylic acid having 12 to 30 carbon atoms.
There may be a ketone group, aldehyde group, epoxy group and the like. Specifically, lauric acid, myristic acid, palmitic acid, stearic acid, arginic acid, heptadecylic acid, behenic acid, oleic acid, elaidic acid, ericic acid, linoleic acid, linoleic acid, ricinoleic acid, hydroxystearic acid, montanic acid , Isostearic acid, epoxy stearic acid and the like. Further, a part thereof may be replaced with a carboxylic acid or dicarboxylic acid other than the aliphatic monocarboxylic acid. The metal constituting the basic metal soap (F) is at least one metal of Group II of the periodic table, and specifically refers to an alkaline earth metal IIa and a zinc group metal IIb, preferably Mg, Ca, Zn.

The basic metal soap (F) can be used as it is, but may be used as a master batch using the same one as the polyolefin (A). The compounding time of the basic metal soap (F) is not particularly limited, and may be either at the time of producing the polyolefin-based resin composition or at the time of molding. In this case, the compounding amount is 0.005 to 5.0% by weight, preferably 0.05 to 5.0% by weight based on the above-mentioned polyolefin resin composition.
Add 0.5% by weight. If the amount is less than 0.005% by weight, the effect is not exhibited, and if it exceeds 5.0% by weight, it is not preferable because a molded article is defective such as shark skin. In addition, the compounding amount in this case is an amount per basic metal soap component. For example, when a master batch having a content of 10% is used, 0.05 to
It is necessary to mix 50.0% by weight.

It is not clear how the basic metal soap (F) prevents burns and burns during molding of a polyolefin-based resin composition containing a lignocellulose-based or cellulosic substance. (F) acts as an anionic compatibilizer in the resin,
In addition to improving the phase melt compatibility of the low molecular weight resin and other additives in the molten resin, preventing the formation of sidestreams and preventing the occurrence of eye tarnish, it also acts as a type of surfactant and melts the fatty acid molecules. It is conceivable that they are entangled in the resin as an anchor, are arranged in a racemic manner on the surface of the molten resin, form a monomolecular film, and block the contact with the metal surface of the mold.

Next, various molded products can be manufactured by subjecting the above-mentioned raw materials to molding using ordinary molding means such as an extrusion molding machine and an injection molding machine. The application field of the molded article obtained by the production method of the present invention is not particularly limited, and it can be used in many fields in which thermoplastic resins have been used conventionally. It can be suitably used in the field of materials for use and the like, and particularly preferably used as a raw material for housing members, building materials and home electric appliances.

More specifically, baseboards, decorative boards, door materials,
Exterior wall materials, vanities, countertop materials, foundation backing plates, window frames, wall materials, surrounding rims, handrails, handles, structural materials, civil engineering timber, pillars, floor columns, decorative columns, earthquake-resistant materials, wallpaper, ceiling materials, Underlay materials, tatami mats, floors, concrete panels, scaffolding materials, shielding boards,
Sound insulation board, furniture box ceiling, door, front board back board, shelf board, sleeve board, curtain board, deck, back board, seat board, tray, mana board, kitchen material, waterproofing material, fungicide material, antiseptic material, Shutter boards, hip boards, side boards, bus unit floor vans, bus ceilings, bus walls, buses, snowboards, tubs,
Ceramic equipment, toilet seats, toilet lids, radio TV receivers, cabinets, stereo cabinets, amplifier cabinets, speakers, piano organ master boards, large roofs, rolled roofs,
It can be suitably used as a material for upper and lower scroll boards.

[0037]

Next, an embodiment of the present invention will be described. The raw materials used and the evaluation method are as follows.

<Polyolefin (A)> The melt flow rate (MFR) of polypropylene is 230.
° C, load 2.16 kg, temperature 1 for polyethylene
ASTM D123 under the condition of 90 ° C and load of 2.16 kg
8 is the result of measurement.

PP: polypropylene (homopolypropylene, MFR = 0.5 g / 10 min, specific gravity = 0.9) PE: polyethylene (high-density polyethylene, MFR =
0.03 g / 10 min, specific gravity = 0.95) <Lignocellulosic or cellulosic substance (B)> Wood flour: Lignocell CB120 <Organic peroxide (C)> PO: 2,5-dimethyl-2,5 (T-butylperoxy) hexane <Polybasic acid anhydride (E)> MA: Maleic anhydride <Basic metal soap (F)> F1: Master batch containing 10% basic fatty acid magnesium salt (base polymer: low density polyethylene) <Trade name: AP-600P, manufactured by Seishin Kasei Co., Ltd.><Lubricant> F2: Master batch containing 40% of a silicone-based processing aid obtained by graft-polymerizing a reactive organosiloxane to a thermoplastic resin (base polymer: low-density polyethylene) , Trade name: Master pellet SP-300, manufactured by Dow Corning Asia Ltd.) F3: Calcium stearate F : Magnesium stearate F5: Zinc stearate F6: Paraffin wax (trade name: Hi-wax) <Measurement method for evaluation of moldability> Extruder (L / D = 25, Laboplastomill manufactured by Toyo Seiki Co., Ltd.) Screw diameter =
Attach a strand die (diameter = 5 mm) to 20 mm, full flight, compression ratio = 2.0, and set the temperature to C1 = 1.
80 ° C., C2 = 190 ° C., C3 = 185 ° C., D = 180
C., and the above pellets were extruded under the condition of a rotation speed of 20 rpm, and the state of the surface of the extruded strand was observed.

<Measurement Method for Evaluating Releasability> Molded product dimensions: 230 × 85 × 6 mm mold, heating temperature 2
Preheating time at 00 ° C for 10 minutes, press pressure 10kgf / cm
2 (gauge pressure), heating and compression time 2 minutes, cooling press pressure 1
The above pellets were compression-molded under the conditions of 0 kgf / cm2 and a cooling time of 20 minutes, and the releasability of the formed product and the mold was observed.

Examples 1 to 3 and Comparative Examples 1 to 7 Wood flour (B) and maleic anhydride (E) were supplied to a continuous kneader, heated and kneaded at 150 ° C. for 8 minutes to obtain esterified wood flour (B). '), A polyolefin (A), an organic peroxide (C) and a basic metal soap (F) or a lubricant were added thereto in the proportions shown in Table 1, and the mixture was heated at 180 ° C in a continuous kneader.
For 3 minutes to obtain a polyolefin-based resin composition. Next, pellets of 4 mm square were formed using a sheet pelletizer manufactured by Horai Co., Ltd., and evaluated in each test. The results are also shown in Table 1.

[0042]

[Table 1]

As is clear from Table 1, the molded article of the present invention containing the basic metal soap (F) according to Examples 1 to 3 at a ratio of 0.005 to 5.0% by weight was obtained. While the mold releasability was excellent, the molded article of Comparative Example 1 to which none of them was added was poor in both strand appearance and mold releasability. On the other hand, Comparative Example 2,
When the silicone-based processing aid of No. 3 and the conventionally used metal soap-based lubricant of Comparative Examples 4 to 7 are blended, an effect similar to the case of blending the basic metal soap (F) is obtained. Did not.

[0044]

According to the production method of the present invention, the basic metal soap (F) is added to the polyolefin resin composition during molding.
Is contained, so that low molecular weight components and compounds having polar groups in the composition are prevented from adhering to the inner surface of the molding machine and the mold during molding, so that a large amount of lignocellulosic or cellulosic material is used. Despite the inclusion in the steel, there is no generation of burns, burns, etc. during molding, and molding can be continuously performed for a long time. In particular, when the lignocellulosic or cellulosic substance (B) and the polybasic acid anhydride (E) are heated and kneaded in advance to form an esterified lignocellulosic or cellulosic substance (B ′), the molding processability and the mechanical properties are improved. It has become possible to produce a molded article having excellent strength at low cost.

──────────────────────────────────────────────────続 き Continued on the front page (51) Int.Cl. ⁶ Identification code FI C08L 97:00) (72) Inventor Matsuda ▲ Hide ▼ Ame 1515 Nakatsucho, Marugame-shi, Kagawa Prefecture Okura Industry Co., Ltd.

Claims (6)

[Claims] When a polyolefin resin composition containing a lignocellulosic or cellulosic material is molded, the basic metal soap (F) is added in an amount of 0.005 to 5.0% by weight based on the resin composition. A method for producing a molded article, which comprises mixing. 2. The method according to claim 1, wherein the polyolefin resin composition contains at least 20% by weight of a lignocellulosic or cellulosic substance. 3. The polyolefin resin composition according to claim 1, wherein said organic peroxide (C) is 0.1% based on the total amount of polyolefin (A), lignocellulosic or cellulosic substance (B), and (A) (B). The method for producing a molded article according to claim 1, wherein 005 to 1% by weight and modified polyolefin (D) 0.1 to 10% by weight are kneaded with heat. 4. The polyolefin-based resin composition according to claim 1, wherein said organic peroxide (C) is 0.1% based on the total amount of polyolefin (A), lignocellulosic or cellulosic substance (B), and (A) (B). The method for producing a molded article according to claim 1, wherein 005 to 1% by weight and polybasic acid anhydride (E) 0.5 to 20% by weight are kneaded with heat. 5. The polyolefin resin composition is prepared by heating and kneading a lignocellulosic or cellulosic substance (B) and a polybasic acid anhydride (E) in advance and esterifying the lignocellulosic or cellulosic substance (B ′). ), After which the polyolefin (A) and the organic peroxide (C) are blended and heated and kneaded. 6. A polyolefin (A) having a melt flow rate of 0.1 to 200 g / 10 minutes (ASTMD123).
8, temperature 230 ° C., load 2.16 kg) polypropylene and melt flow rate 0.01 to 200 g / 10 min (ASTMD1238, temperature 190 ° C., load 2.16 k)
The method for producing a molded article according to any one of claims 1 to 5, which is a mixture of g) polyethylene.