WO2019150907A1 - Cellulose fiber master batch, cellulose fiber-containing resin composition, method for producing cellulose fiber master batch, method for producing cellulose fiber-containing resin composition, and molded body of cellulose fiber-containing resin composition - Google Patents

Abstract

Provided is a resin composition in which a large quantity of cellulose fibers are dispersed with respect to a base resin. A cellulose fiber master batch according to the present invention contains (A) cellulose fibers and (B) at least one coating composition that is selected from the group consisting of sharp melting crystalline resin materials that have a melting point of from 40°C to 155°C (inclusive), lubricants and dispersants; and this cellulose fiber master batch forms a master batch pellet which has a coating binder layer that is formed from the coating composition (B) on the surfaces of the cellulose fibers (A). In addition, a resin pellet contains (C) a base resin that has a melting point or softening point of from 80°C to 250°C (inclusive) in addition to the master batch; and the resin pellet contains from 60 parts by mass to 2 parts by mass of the cellulose fibers (A) and from 40 parts by mass to 98 parts by mass of the base resin (C) when the total of the cellulose fibers (A) and the base resin (C) is taken as 100 parts by mass.

Description

Cellulose fiber masterbatch, cellulose fiber-containing resin composition, production method thereof, and molded article of cellulose fiber-containing resin composition

The present invention relates to a cellulosic fiber master batch, a cellulosic fiber-containing resin composition, a production method thereof, and a molded body of the cellulosic fiber-containing resin composition.

In recent years, it has been proposed worldwide that organic resources (biomass materials) such as wood and grass are reused from the viewpoint of environmental protection and the formation of a recycling society. By utilizing biomass materials, new industrial development and economic growth can be realized while overcoming environmental problems caused by heavy use of fossil fuels. This is called the “bioeconomy” and countries around the world have come up with promotion measures.

In the field of manufacturing using living organisms, in recent years, in addition to cellulose fibers, cellulose nanofibers (CNF), cellulose nanocrystals (CNC), lignocellulose nanofibers (RCNF), lignocellulose nanocrystals (RCNF), etc. Fiber is attracting attention. Cellulose fiber is a general term for fibers made from cellulose. Cellulose nanofibers are biomass materials in which the thickness of wood fibers is reduced to a nanometer size.

Among them, the weight of cellulose nanofibers is about one fifth that of steel, but the weight of cellulose nanofibers is about five times that of steel, and the deformation of cellulose nanofibers due to heat is comparable to that of quartz glass. Cellulose nanofibers are said to have numerous characteristics, such as few. If a system that enables mass production of cellulose nanofibers at low cost using trees as raw materials is in place, it can be blended into base resin instead of glass fiber and other inorganic fillers, so that it can be used for transportation equipment such as automobiles, OA / electrical electronics. It is expected to be widely used in various fields such as fields and building materials, and can contribute widely as lightweight and high-strength materials in industrial and consumer fields.

As long as these cellulosic fibers are blended with the base resin and used, defossil fuel conversion cannot be realized completely. However, for example, by providing a resin molded body in which cellulose nanofibers are blended with a base resin, the energy required to move the transportation equipment can be reduced by reducing the weight of transportation equipment such as automobiles. It is assumed that the amount of fossil fuel used can be reduced.

Contributing to a next-generation “bioeconomy” society that is steadily advancing in Europe, aiming to achieve zero CO ₂ emissions and transforming food, energy, life-related materials and industrial materials into a bio-recycling society Therefore, provision of the resin composition which mix | blended cellulosic fiber with base resin is calculated | required.

As such a resin composition, (A) 1 to 60 parts by mass of cellulose nanofibers having an average thickness of 10 to 200 nm and fibrillated with a high-pressure water stream and (B) 99 to 40 parts by mass of polyolefin resin There has been proposed a polyolefin resin composition containing 0.2 to 30 parts by mass of (C) a terpene phenol-based compound with respect to 100 parts by mass of a resin mixture comprising (see Patent Document 1). According to this resin composition, it is possible to provide a resin composition that is excellent in environmental characteristics due to the use of a biomass material, has little reduction in impact strength, has a low specific gravity, high rigidity, and excellent molded appearance.

In addition, a method for producing an additive masterbatch containing a resin additive having a high content of 75 to 99.9% by mass using a side chain crystalline polymer has been proposed (see Patent Document 2).

JP 2016-079311 A Japanese Patent No. 6108782

However, Patent Document 1 stipulates that it can be contained in a range of 1 to 60 parts by mass of cellulose nanofibers and 99 to 40 parts by mass of polyolefin resin (claim 1), but is described in the examples. Is an example in which 2.5 parts by mass of cellulose nanofibers and 95 parts by mass of polypropylene are mixed (Example 1), and an example in which 5 parts by mass of cellulose nanofibers and 90 parts by mass of polypropylene are mixed (Example 2). Further, the examples are only examples (Examples 3 to 6) in which 10 parts by mass of cellulose nanofibers and 85 parts by mass of polypropylene are mixed. Therefore, it cannot be said in Patent Document 1 that cellulose nanofibers can be contained in excess of 10 parts by mass.

Further, in Patent Document 2, the application to a fine and novel naturally-derived high-strength material such as cellulose nanofiber has not been assumed and has not been confirmed.

In fact, it has been known that it is not easy to blend a large amount of cellulosic fibers with the base resin in the conventional technology, and even in an actual production base, the proportion of cellulosic fibers blended is the base resin. Is at most several parts by mass. Therefore, it is required to provide a technique capable of easily blending a large amount of cellulosic fibers with the base resin.

The present invention has been made in view of such a problem, and an object thereof is to provide a resin pellet in which a relatively large amount of cellulosic fibers is dispersed in a base resin in a simple and inexpensive manner.

As a result of intensive studies to achieve the above-mentioned problems, the present inventors have prepared a master batch in which the surface of a cellulosic fiber is coated and bound with a specific coating binding composition. Has been found to be blended with the base resin in a high content, and the present invention has been completed. Specifically, the present invention provides the following.

The invention according to the first feature is selected from the group consisting of (A) a cellulosic fiber and (B) a sharp melt crystalline resin material having a melting point of 40 ° C. or higher and 155 ° C. or lower, a lubricant, a dispersant, and a compatibilizer. A cellulosic fiber masterbatch having a coating binding layer comprising the coating composition (B) on the surface of the (A) cellulose nanofiber.

Although the cellulose fiber itself cannot contain so much cellulosic fiber in the base resin, the masterbatch can be added in a large amount to the base resin. Thereby, when manufacturing resin pellets in which cellulosic fibers are dispersed, it becomes possible to freely select the blending amount of cellulosic fibers with respect to the base resin from a small amount to a large amount according to the function required of the molded body. . For example, when manufacturing resin pellets, the amount of cellulosic fibers to the base resin is set to the target value of physical properties such as specific gravity, tensile strength, bending strength, thermal deformation rate, thermal shrinkage rate, Charpy impact strength strength of the molded product. It is possible to adjust flexibly to match.

Also, the type of base resin can be changed, and a variety of cellulosic fiber-containing resins can be combined. The base resin may be a thermoplastic resin having a melting point or softening point of 80 ° C. or higher and 250 ° C. or lower when the cellulosic fiber is unmodified, a thermosetting resin, or a monomer, oligomer before curing or crosslinking if it is rubber. Complexing with a polymer is also possible.

The invention according to the second feature is selected from the group consisting of (A) cellulosic fibers and (B) a sharp melt crystalline resin material having a melting point of 40 ° C. or higher and 155 ° C. or lower, a lubricant, a dispersant, and a compatibilizing agent. And (C) a base resin having a melting point or softening point of 80 ° C. or higher and 250 ° C. or lower, and the surface of the (A) cellulosic fiber is formed on the surface of the (B) coating composition. The (A) cellulosic fiber having the coating layer is dispersed in the (C) base resin, and the total of the (A) cellulosic fiber and the (C) base resin is obtained. Cellulosic fiber-containing resin comprising 100 parts by mass of (A) 60 to 2 parts by mass of (A) cellulosic fibers and 40 to 98 parts by mass of (C) the base resin To provide a Narubutsu.

When the surface of the cellulosic fiber does not have a coating layer made of a coating composition, it is difficult to blend 10 parts by mass or more of the cellulosic fiber with respect to the total amount of the cellulosic fiber and the base resin. According to the second aspect of the invention, 10 parts by mass or more of the cellulose fiber can be blended with respect to the total amount of the cellulosic fiber and the base resin. The amount of freedom can be increased. The resin composition obtained by the invention according to the second feature is an injection molding machine, an extrusion molding machine, a blow molding machine, an inflation molding machine, a sheet molding machine, a hot press molding machine, and a compressed air (vacuum / pressure) molding machine. Using a conventionally known molding machine, it is possible to perform molding in the same manner as molding a resin that has been widely used so far.

The invention according to the third feature provides a molded body formed by molding the cellulose-based fiber-containing resin composition in the invention according to the second feature alone or in combination with another base resin.

According to the invention relating to the third feature, it is possible to include a large amount of cellulosic fibers in the molded product, and by adjusting the ratio of the base resin and the cellulosic fibers that are components of the molded product, Therefore, it is possible to easily provide a high-strength and lightweight molded body that is not present.

The invention according to the fourth feature corresponds to a category difference from the invention according to the first feature, and the invention according to the fifth feature corresponds to a category difference from the invention according to the second feature. According to the fourth and fifth aspects of the invention, when manufacturing cellulose-based fiber-containing resin pellets, the amount of cellulose-based fibers in the base resin can be freely adjusted from a small amount to a large amount depending on the function required of the molded body. A system that can be selected can be simply provided.

According to the present invention, it is possible to provide a resin composition in which a large amount of cellulosic fibers are dispersed in a base resin. For this resin composition, a conventionally known molding machine such as an injection molding machine, an extrusion molding machine, a blow molding machine, an inflation molding machine, a sheet molding machine, a hot press molding machine, a pressurized air (vacuum / pressurization) molding machine or the like is used. Thus, it can be molded in the same manner as a resin that has been widely used so far.

Hereinafter, specific embodiments of the present invention will be described in detail. However, the present invention is not limited to the following embodiments, and may be implemented with appropriate modifications within the scope of the object of the present invention. can do.

<Cellulose fiber master batch>
The cellulosic fiber masterbatch (hereinafter also simply referred to as “masterbatch”) in this embodiment includes (A) a cellulosic fiber and (B) a specific coating composition, and (A) a cellulosic fiber. On the surface, a coating binder layer made of the coating composition (B) is provided.

[(A) Cellulosic fiber]
In the present embodiment, the (A) cellulosic fiber is a long fiber obtained by subjecting a plant cellulosic material obtained from trees or the like and / or a plant cellulosic material (cotton, wood pulp, etc.) to chemical treatment and dissolution. A fiber composed of a regenerated cellulosic material in the form of a fiber, and the fiber may contain components such as lignin and hemicellulose. From the viewpoint of “bioeconomy” for reusing organic resources (biomass materials) such as wood and grass, the cellulosic fibers are preferably natural cellulosic fibers.

Examples of cellulosic fibers include cellulose fibers derived from polysaccharides including natural plants such as wood fibers, bamboo fibers, sugarcane fibers, hemp fibers, seed hair fibers, and leaf fibers. These cellulose fibers may be used alone or in a combination of two or more.

In addition, it is preferable to use pulp having an α-cellulose content within a certain range as the polysaccharide raw material. Easy to adjust the fiber diameter and fiber length, suppresses the entanglement between fibers, has high thermal stability when melted in the base resin, and can provide a molded article having high impact strength, good coloration suppressing effect For this reason, the lower limit of the α-cellulose content is preferably 60 parts by mass or more, and more preferably 70 parts by mass or more.

Cellulosic fibers can be divided into cellulose fibers and cellulose nanofibers according to their average thickness. In this embodiment, a cellulosic fiber contains both a cellulose fiber and a cellulose nanofiber.

The cellulose nanofiber may be cellulose nanofiber (CNF), cellulose nanocrystal (CNC), lignocellulose fiber (RCNF) or lignocellulose crystal (RCNC) containing a lignin component. ). The cellulose nanofiber may be a fiber obtained by modifying one or more of CNF, CNC, RCNF, and RCNC. The cellulose nanofiber may be a combination of a plurality of types of cellulose nanofiber. As cellulose nanofibers modified with CNF, fibers obtained by acetylating CNF and fibers obtained by benzoylating CNF are well known. In addition, CNF is acid-modified with maleic anhydride, alkenyl succinic acid, TEMPO (2,2,6,6-tetramethylpiperidine 1-oxyl), CNF is alkali-modified, CNF is octanoylated Moreover, the fiber etc. which esterified CNF are also known.

The average thickness of the cellulosic fiber is not particularly limited. When transparency is required, several nanometers are required. However, when high strength is required, the average thickness of the cellulosic fibers can be dispersed so that a larger amount of cellulosic fibers can be dispersed in the base resin. The lower limit of the thickness is preferably 10 nm or more, more preferably 20 nm or more, and further preferably 30 nm or more.

In addition, since the fluidity and the dispersibility in the base resin are excellent, the upper limit of the average thickness of the cellulosic fibers is preferably 300 μm or less, and more preferably 200 μm or less. In addition, since the resin pellet having low specific gravity and high rigidity can be provided when blended with the base resin, the upper limit of the average thickness of the cellulosic fibers is more preferably 1 μm or less, and is preferably 500 nm or less. Even more preferably, it is particularly preferably 200 nm or less, and most preferably 100 nm or less.

In the present invention, the average thickness of the cellulosic fiber is a value measured by a scanning electron microscope.

(A) Although the compounding quantity of a cellulose fiber is not specifically limited, In order to be able to provide the resin pellet which disperse | distributed more cellulose fibers, the minimum of a compounding quantity is 70 mass parts with respect to a primary masterbatch. It is preferable that it is above, it is more preferable that it is 80 mass parts or more, and it is further more preferable that it is 90 mass parts or more.

[(B) Coating composition (for primary masterbatch)]
(B) The coating composition contains at least one selected from the group consisting of a sharp melt crystalline resin material having a melting point of 40 ° C. or higher and 155 ° C. or lower, a lubricant, a dispersant, and a compatibilizing agent.

[Sharp melt crystalline resin material]
In this embodiment, the sharp melt crystalline resin material has a mass average molecular weight (Mw) of 8,000 or more, and a half-value width (Wm) of a melting endothermic peak measured using a differential thermal scanning calorimeter (DSC). ) Refers to a resin material having a temperature of 10 ° C. or lower. The mass average molecular weight (Mw) is a polystyrene equivalent mass average molecular weight (Mw) by GPC (gel permeation chromatography).

The mass average molecular weight (Mw) of the sharp melt crystalline resin material is 8,000 or more, preferably 10,000 or more. If the mass average molecular weight (Mw) is too small, there is a possibility of bleeding out at the use temperature in the final resin composition, which is not preferable.

The half-value width (Wm) of the melting endothermic peak of the sharp melt crystalline resin material when measured using a differential thermal scanning calorimeter (DSC) is 10 ° C. or less, preferably 8 ° C. or less. If the half-value (Wm) is excessive, a low molecular weight component is contained, which is not preferable.

The lower limit of the melting point (Tm) of the sharp melt crystalline resin material is 40 ° C. or higher. The lower limit is more preferably 40 ° C. or higher, and further preferably 60 ° C. or higher. If the melting point is too low, it will affect the use limit temperature of the final composition. The sharp melt crystalline resin material is hard at room temperature and can provide a masterbatch with reduced stickiness.

The upper limit of the melting point (Tm) of the sharp melt crystalline resin material is 155 ° C. or less. The upper limit is more preferably 120 ° C. or less, and further preferably 100 ° C. or less. If the melting point is too high, the dispersion operability during mixing will be affected. When the melting point (Tm) is 100 ° C. or lower, the sharp melt crystalline resin material is heated in various granulators or melted by the heat of generated steam, and can exhibit the properties as a binder relatively easily. .

Paraffin, which is a conventional low-melting-point material, has low stability at high temperatures, so the resulting masterbatch may be colored, smoked, or ignited due to deterioration at high temperatures when blended with a thermoplastic resin. There is. In addition, these conventional low melting point materials are easily sticky, may bleed, and may deteriorate physical properties.

In this embodiment, the melting point (Tm) is measured as follows. Using a differential scanning calorimeter (DSC), observed from a melting endotherm curve obtained by holding the sample at −30 ° C. for 5 minutes in a nitrogen atmosphere and then increasing the temperature to 190 ° C. at 10 ° C./min. It has a melting point (TmD) defined as the peak top of the maximum peak, and after holding at 190 ° C. for 5 minutes, it was lowered to −30 ° C. at a rate of 5 ° C./minute, and after holding at −30 ° C. for 5 minutes The peak top observed from the melting endothermic curve obtained by raising the temperature to 190 ° C. at 10 ° C./min is defined as the melting point (Tm). A plurality of peaks (including shoulder peaks) may be observed in the second temperature rising process for measuring the melting point (Tm), but one peak is observed as a sharp melt crystalline resin material. It is preferable. One peak means that there is no absorption seen as other peaks or shoulders.

Among the sharp melt crystalline resin materials, side chain crystalline polymers are preferable. The side chain crystalline polymer is also called a comb polymer, and is a polymer having a side chain composed of aliphatic and / or aromatic with respect to a skeleton (main chain) composed of an organic structure, It is characterized by being a structure that can enter a crystal structure. Side-chain crystalline polymers have been found to melt or disperse very finely in various base resins at a certain temperature or higher, and can suppress bleeding at high temperatures, so that the final composition can be used practically. The maximum temperature can be increased. Further, the melt viscosity at a high temperature exceeding the melting point is low, and the kneading with the base resin is easy.

The side chain crystalline polymer is preferably a powder at normal temperature (0 ° C. to 35 ° C.). The side chain crystalline polymer is hard at normal temperature and can be easily powdered by pulverization. The particle size of the powder is not particularly limited, but it is preferable that coarse particles are not contained, and the maximum particle size contained in the powder is preferably 1000 μm or less, more preferably 500 μm or less, and even more preferably 300 μm or less. Note that the maximum grain system is a value calculated from the size of the eye through which the powder passes the vibrating screen.

Examples of the side chain crystalline polymer include side chain crystalline polymers such as α-olefin polymers, alkyl acrylate polymers, alkyl methacrylate polymers, alkyl ethylene oxide polymers, polysiloxane polymers, and acrylamide polymers. Of these, α-olefin polymers obtained by polymerizing α-olefins, which are inexpensive and readily available, particularly higher α-olefin polymers are preferred. Alkyl acrylate polymers and alkyl methacrylate polymers are prone to hydrolysis and deteriorate over time due to heat, so they have low storage stability. A side chain crystalline polymer can be used individually by 1 type or in combination of 2 or more types.

Among the side chain crystalline polymers, (1) a higher α-olefin having 10 or more carbon atoms, or (2) a higher α-olefin obtained by polymerizing a higher α-olefin having 10 or more carbon atoms and one or more other olefins. A higher α-olefin polymer having a unit content of 50 mol% or more is preferred. Such a higher α-olefin polymer is structurally stable, hardly deteriorates or decomposes due to an environment such as hydrolysis, and is extremely stable even at a high temperature.

When the side chain crystalline polymer contains a higher α-olefin having 10 or more carbon atoms, the side chain crystallinity of the side chain crystalline polymer is increased, so that a change in crystallinity during melting and crystallization is increased, resulting in high production. An additive masterbatch having graininess can be obtained. The number of carbon atoms of the higher α-olefin is more preferably 12 or more, further preferably 12 or more and 50 or less, and particularly preferably 14 or more and 30 or less.

In addition, when the content of the higher α-olefin unit is 50 mol% or more, the side chain crystallinity of the side chain crystalline polymer increases, so that the change in crystallinity during melting and crystallization increases, resulting in high granulation. An additive masterbatch having properties can be obtained. The content of the higher α-olefin unit is more preferably 70 mol% or more, further preferably 90 mol% or more, and particularly preferably 100 mol%.

[Lubricant]
As the lubricant, an inorganic lubricant or an organic lubricant is used. Examples of inorganic lubricants include talc, silica, zeolite, mica, and organic lubricants include fatty acid amides and silicon compounds. The fatty acid amides include caproic acid amide, caprylic acid amide, capric acid amide, lauric acid amide, myristic acid amide, palmitic acid amide, stearic acid amide, arachidic acid amide, behenic acid amide, palmitoleic acid amide, oleic acid amide, eicosene Acid amide, erucic acid amide, elaidic acid amide, trans-11-eicosenoic acid amide, trans-13-docosenic acid amide, linoleic acid amide, linolenic acid amide, ricinoleic acid amide, ethylenebisstearic acid amide, erucic acid amide, steer Calcium phosphate, zinc stearate, magnesium stearate, aluminum stearate, barium stearate, lithium stearate, lead stearate, sodium oleate, barium laurate, laurin Zinc, and the like stearate.

[Dispersant]
As a dispersing agent, various kinds generally used as an emulsifier can be used. Examples of the emulsifier include general dispersion / emulsifiers such as nonionic surfactants and anionic surfactants, and reactive emulsifiers having an ethylenically unsaturated group in the molecule.

Nonionic surfactants include polyvinyl alcohol, modified polyvinyl alcohol, polyoxyethylene alkyl ether, polyoxyethylene alkyl phenyl ether, polyoxyethylene derivative, oxyethylene / oxypropylene block copolymer, polyoxyethylene sorbitan fatty acid ester, polyethylene glycol Examples include fatty acid esters.

Anionic surfactants include fatty acid salts, alkyl sulfate esters, alkyl benzene sulfonates, alkyl naphthalene sulfonates, alkyl sulfosuccinates, alkyl diphenyl ether disulfonates, alkyl phosphates, polyoxyethylene alkyl sulfates. , Naphthalenesulfonic acid formalin condensate, special polycarboxylic acid type polymer surfactant, polyoxyethylene alkyl phosphate, and the like.

[Compatibilizer]
With regard to the compatibility between the thermoplastic resin and the cellulose component or lignin component, it is well known that a maleic anhydride-modified polymer is particularly effective as a compatibilizing agent.

(B) Although the compounding quantity of a coating composition is not specifically limited, In order to be able to coat | cover with the (B) coating composition on the surface of (A) cellulosic fiber, the minimum of compounding quantity is with respect to a masterbatch. The amount is preferably 0.1 parts by mass or more, more preferably 1 part by mass or more, further preferably 3 parts by mass or more, and still more preferably 5 parts by mass or more. (B) When the blending amount of the coating composition is 0.1 parts by mass or a small amount close to it, the surface of the (A) cellulosic fiber can be coated by using an emulsion type material. In addition, in this embodiment, the compounding quantity of (B) coating composition shall be a value when it calculates with solid content.

Moreover, in order to be able to coat and bind to the surface of (A) cellulosic fiber with (B) the coating composition, the upper limit of the blending amount of the coating composition is 50 parts by mass or less with respect to the master batch. preferable. And (B) In order to prevent that the physical property of a final composition falls by having many compounding quantities of a coating composition, the upper limit of the compounding quantity of (B) coating composition is 30 with respect to a masterbatch. It is preferably no greater than part by mass, more preferably no greater than 20 parts by mass, even more preferably no greater than 10 parts by mass, and particularly preferably no greater than 5 parts by mass.

[Other materials]
The primary masterbatch may contain additives in addition to (A) the cellulosic fiber and (B) the coating composition. (A) Since it can prevent the oxidation of the cellulose fiber-based material, a lubricant, an antioxidant, an ultraviolet ray inhibitor, an anti-aging agent, a compatibilizer with a base resin, and the like as additives are added to the coating composition (B) Can be used together.

[Production method of primary masterbatch]
The master batch is (A) a cellulosic fiber, (B) a coating composition, an additive as necessary, and water, warm water or hot water as necessary. It can be obtained by mixing using a kneader, an extruder, an extrusion pelletizer, a disc beret or the like. The obtained pellet-like or powdery mixture may be used as it is as a compound for mixing the base resin, but may be further melt-kneaded with an extruder or a pelletizer to be pelletized.

The mixing temperature may be equal to or higher than the melting point of the coating composition (B) for binding, but is preferably about 10 ° C. higher than the melting point.

When manufacturing the master batch, it is desirable to add water, hot water or hot water to the system as necessary. By adding water, warm water or hot water, not only the components are easily mixed, but also the pelletization is facilitated by the steam heat heated in the mixer.

<Cellulose nanofiber-containing resin composition>
The cellulose nanofiber-containing resin composition in the present embodiment (hereinafter also simply referred to as “resin composition”) includes (C) a specific base resin in addition to the various components described in the “Masterbatch” section. And (A) cellulosic fiber which has a coating layer is disperse | distributed to (C) base resin. At that time, a relatively small amount of the coating composition (B) is melt-dispersed or diffused in the base resin (C) like an additive.

[(C) Base resin]
The lower limit of the melting point or softening point of the base resin is 80 ° C. or higher. The lower limit is more preferably 90 ° C. or higher, and further preferably 100 ° C. or higher. If the melting point is too low, it has been widely used in conventionally known molding machines such as injection molding machines, extrusion molding machines, blow molding machines, inflation molding machines, sheet molding machines, hot press molding machines, and pressure forming machines. There is a possibility that it cannot be molded by the same method as that for molding the resin.

(A) Cellulosic fibers, when unmodified, are usually pyrolyzed at 200 ° C. or higher to generate carbonization and odor. Brown or black due to thermal decomposition, but in the case of thermoplastic resin, the upper limit of the melting point or softening point of the base resin is short-time manufactured or modified CNF in order to prevent coloring or odor of the molded product (product) However, it is preferably 250 ° C. or lower, more preferably 200 ° C. or lower, and even more preferably 190 ° C. or lower.

(C) As the base resin, any of a thermoplastic resin, a thermosetting resin, or rubber may be used. In the case of a thermosetting resin, it can be kneaded into a monomer or oligomer before curing. In the case of rubber, it can be kneaded into an uncrosslinked polymer.

As the thermoplastic resin, either amorphous plastic or crystalline plastic may be used. Specifically, polyvinyl chloride, polystyrene, acrylonitrile-styrene (AS) resin, acrylonitrile-butadiene-styrene (ABS) resin, polycarbonate, polyethylene, polypropylene, polybutylene, polyester, polyamide, polyacetal, ethylene-vinyl acetate copolymer Many materials including (EVA), polylactic acid, thermoplastic elastomer, etc., or copolymers thereof can be used. Examples of the thermosetting resin include melamine resin, unsaturated polyester resin, silicone resin, epoxy resin, phenol resin, thermosetting elastomer, and copolymers thereof. The polyethylene may be any of high density polyethylene (HDPE), low density polyethylene (LDPE), and linear low density polyethylene (L-LDPE), and the polypropylene includes metallocene polypropylene. Polyester includes polyethylene terephthalate (PET) and polybutylene terephthalate. Examples of the thermoplastic elastomer include styrene elastomers, urethane elastomers, olefin elastomers, and vinyl chloride elastomers. Blend polymers may be used. Examples of rubbers include natural rubber, and examples of synthetic rubbers include isoprene, butadiene, styrene butadiene, chloroprene, nitrile, polyisobutylene, ethylene propylene, chlorosulfonated PE, acrylic, fluorine, urethane, and silicone rubber. It is done. In addition to petroleum-derived resins, bio-derived resins such as plants can be used for these, and in that case, the bioavailability can be further improved.

(C) The MFR (melt flow rate) of the base resin is not particularly limited. From the viewpoint of mixing dispersibility, the lower limit of MFR is preferably 0.5 or more, more preferably 2 or more, and further preferably 5 or more.

Further, although the upper limit of MFR is not particularly defined in view of mixing workability, it is preferably 200 or less, more preferably 100 or less, and further preferably 50 or less.

In this embodiment, the MFR of the (C) base resin is measured according to JIS K 7210. However, the measurement temperature of MFR differs depending on the temperature conditions at the time of kneading.

When the total of (A) cellulosic fibers and (C) base resin is 100 parts by mass, the resin pellets are (A) 60 parts by mass to 2 parts by mass of cellulose nanofibers, and (C) 40 parts by mass of base resin. 98 parts by mass.

(A) It becomes possible to provide resin pellets in which a larger amount of cellulose nanofibers are dispersed with respect to the base resin as the proportion of cellulose-based fibers increases. On the other hand, if the proportion of (A) cellulosic fibers becomes too high, not only will the cost be increased commercially, but the moldability when molding resin pellets, and the molded body obtained from molded resin pellets May affect performance (such as tensile strength).

When the total of (A) cellulosic fiber and (C) base resin is 100 parts by mass, the mass of (A) cellulosic fiber is 2 parts by mass or more, preferably 5 parts by mass or more. More preferably, it is more than 20 parts by mass. In other words, the mass of the (C) base resin is 98 parts by mass or less, preferably 95 parts by mass or less, more preferably 90 parts by mass or less, and further preferably 80 parts by mass or less. .

Moreover, in order to improve a moldability, when the sum total of (A) cellulosic fiber and (C) base resin is 100 mass parts, the mass of (A) cellulosic fiber is 60 mass parts or less, 50 The amount is preferably at most 40 parts by mass, more preferably at most 40 parts by mass. In other words, the mass of the (C) base resin is 40 parts by mass or more, preferably 50 parts by mass or more, and more preferably 60 parts by mass or more.

[Other materials]
The resin pellets may contain additives and the like in addition to the various components described in the section “(B) Coating composition (for primary masterbatch)” and (C) a specific base resin.

The type of additive is not particularly limited. For example, crosslinking agent, colorant, foaming agent, compatibilizing material, melt-up agent, flame retardant, antistatic agent, heat-resistant agent, weathering agent, antioxidant, nucleating agent, maleic anhydride, adhesive (CMC (carboxymethylcellulose Resin), polyvinyl alcohol, etc.), light stabilizer, nucleating agent, heavy metal deactivator, PVA, peroxide, reducing agent, surfactant, emulsifier, dehydrating agent and the like.

[Crosslinking agent]
The cross-linking agent is typically an organic peroxide, but thermally decomposes at a relatively low temperature or reacts with a reducing substance to easily generate free radicals (free radicals). Examples of the nature of the generated free radical include addition reaction to unsaturated double bond and abstraction reaction such as hydrogen. In the case of rubber, sulfur is typical.

[Colorant]
In addition to (C) the base resin, the color of the resin pellets obtained by blending the base resin can be colored by using the colorant of each color pigment (such as titanium oxide), and the resin pellets were molded. Later molded bodies can be colored.

When the colorant is titanium oxide, in order to make the resin pellets close to white, the lower limit of the amount of titanium oxide is preferably 0.001 part by mass or more with respect to the total mass of the resin pellets, 0.05 mass More preferably, it is more preferably 0.1 parts by mass or more, still more preferably 0.3 parts by mass or more, and particularly preferably 0.5 parts by mass or more. Most preferably, it is below mass parts.

Moreover, in order to prevent use of a colorant uselessly, it is preferable that the upper limit of the compounding quantity of a colorant is 8 mass parts or less with respect to the total mass of a resin pellet, and it is 6 mass parts or less more. Preferably, it is 5 parts by mass or less, more preferably 4 parts by mass or less, particularly preferably 3 parts by mass or less, and most preferably 2 parts by mass or less.

[Foaming agent]
Foaming agents include azodicarbonamide, N, N'dinitropentamethylenetetramine, etc. as organic pyrolytic foaming agents, and hydrogen carbonate, carbonate, bicarbonate and organic as inorganic pyrolytic foaming agents. There are combinations of acid salts. In addition to using a foaming agent as an additive, physical foaming includes a foaming method in which a supercritical fluid is dissolved in a resin under high pressure, and bubbles are generated by pressure reduction or heating.

[Production method of resin pellets]
The resin pellet is a general mixture such as a heating high speed mixer, a heating kneader, a biaxial kneader, a multiaxial roll, etc. by mixing the master batch described above, (C) the base resin, and additives as necessary. It is obtained by putting it into a typical kneading apparatus and melt-kneading it under shear.

The melt-kneading temperature may be at least the melting point or softening point of the (C) base resin, but is preferably a temperature that is 20 ° C. higher than the melting point or softening point.

As a method of pelletization, for example, using a single screw extruder or a twin screw extruder, the cylinder temperature and the die temperature are set to the melting point or the softening point or more, and the residual moisture contained in the master batch is eliminated from the vent hole while pelletizing. Is adopted. Thus, the resin pellet described in the present embodiment is obtained.

The water blended when producing the master batch is (A) a step of coating and binding (B) the coating composition on the surface of the cellulosic fiber, a step of kneading the master batch and (C) the base resin, and kneading It is gradually evaporated through a subsequent pelletizing step. Moreover, it can also dry using various drying equipment before or after the pelletization process with (C) base resin. Therefore, even if water is used when manufacturing the master batch, no particular problem occurs.

<Molded body>
The composite resin pellets thus obtained alone or in combination with other base resins can be used for injection molding machines, extrusion molding machines, blow molding machines, inflation molding machines, sheet molding machines, hot press molding machines, compressed air (vacuum / pressurizing). A compact can be produced using a conventionally known molding machine such as a pressure molding machine.

The “other base resin” may be the same as or different from the (C) base resin used in the resin pellets described above.

When manufacturing a molded object, you may add additives, such as a coloring agent, a compatibilizing agent, a melt-up agent, a flame retardant, an antistatic agent, a heat-resistant agent, a weather resistance agent, antioxidant, as an additive. Further, the molded body may be manufactured by reducing the ratio of (A) the cellulose fiber-based material and increasing the ratio of (C) the base resin.

When using the colorant, the colorant may be blended together with another base resin, or the colorant may be dispersed in another base resin. As a result, even if the molded product in the state where the colorant is not blended is light color or dark color, red, blue, brown, yellow, orange, purple, green, yellow-green, amber, light blue, pink, etc. A molded product colored in a desired color can be obtained.

As colorants, white pigments such as titanium dioxide; black pigments such as carbon black, acetylene black, lamp black, ketjen black, graphite, iron black, aniline black; yellow iron oxide, titanium yellow, monoazo yellow, condensed azo yellow Yellow pigments such as azomethine yellow, bismuth vanadate, benzimidazolone, isoindolinone, isoindoline, quinophthalone, benzidine yellow, permanent yellow; orange pigments such as permanent orange; red iron oxide, naphthol AS azo red, ansanthrone, Red pigments such as anthraquinonyl red, perylene maroon, quinacridone red pigment, diketopyrrolopyrrole, watching red, permanent red; cobalt purple, quinacridone violet, dioxazinba Purple pigments such as olet; Blue pigments such as cobalt blue, phthalocyanine blue and selenium; Green pigments such as phthalocyanine green; Metallic pigments such as aluminum powder, bronze powder, copper powder, tin powder, iron phosphide and zinc powder; Metal Oxide-coated mica powder, pearlescent pigments such as mica-like iron oxide; barita powder, precipitated barium sulfate, barium carbonate, calcium carbonate, gypsum, clay, silica, white carbon, diatomaceous earth, talc, magnesium carbonate, alumina white, Body pigments such as gloss white, monoazo dyes, polyazo dyes, metal complex azo dyes, azo dyes such as pyrazolone azo dyes, stilbene azo dyes, thiazol azo dyes; anthraquino dyes such as anthraquinone derivatives and anthrone derivatives; indigo derivatives and thioindigo derivatives Indigo etc. Phthalocyanine dyes; carbonium dyes such as diphenylmethane dyes, triphenylmethane dyes, xanthene dyes and acridine dyes; quinone imine dyes such as azine dyes, oxazine dyes and thiazine dyes; methine dyes such as polymethine (or cyanine) dyes and adimethine dyes Quinoline dyes; nitro dyes; nitrone dyes; benzoquinone and naphthyquinone dyes; naphthalimide dyes; perinone dyes, and the like. These colorants can be used alone or in combination of two or more. Colorants can include pigments and dyes.

The lower limit of the blending amount of the colorant blended when producing a molded body from resin pellets is preferably 0.05 parts by mass or more, more preferably 0.2 parts by mass or more based on the molded body. Preferably, it is 0.6 mass part or more, More preferably, it is 1 mass part or more.

The upper limit of the blending amount of the colorant to be blended when producing a molded body from resin pellets is preferably 6 parts by mass or less, more preferably 4 parts by mass or less, based on the molded body. It is more preferably at most 2 parts by mass, even more preferably at most 2 parts by mass.

EXAMPLES Hereinafter, the present invention will be specifically described with reference to examples, but the present invention is not limited thereto.

1. Test Example 1: Dispersion of cellulose nanofiber (CNF) in polypropylene resin <Preparation of sample>
[Example 1] Cellulose nanofiber (CNF) content: 30% by mass of resin pellets [Production of primary masterbatch]
83 parts by mass of cellulose nanofiber (product name: selfim powder, average thickness: 30 to 200 nm, manufactured by Mori Machinery Co., Ltd.) and HS crystal (product name: high-grade α-olefin polymer 7100-P, manufactured by Toyokuni Oil Co., Ltd.) ) 13 parts by mass and 4 parts by mass of a lubricant (product name: calcium stearate GP, manufactured by NOF Corporation) were mixed and heated to about 100 ° C. to obtain a mixture. 15 parts by mass of hot water is added to 100 parts by mass of the mixture and mixed. Using a pressure-type extrusion granulator (model name: Multigran, manufactured by Dalton Co., Ltd.), the cellulose nanofibers are sharp melt crystalline resin. The coating was bound and extruded to obtain “CNF primary masterbatch pellets”.

[Production of cellulose nanofiber (CNF) content: resin mass of 30% by mass]
After drying the CNF primary master batch pellet in a vacuum dryer, 36.1 parts by mass of CNF master batch pellets, 61 parts by mass of polypropylene (product name: J3021GR, manufactured by Prime Polymer Co., Ltd.), and maleic anhydride-modified polypropylene 2 9 parts by mass (product name: Kayabrid 002PP-NW, manufactured by Kayaku Akzo Co., Ltd.) was kneaded with a small lab plast mill twin screw extruder (manufactured by Toyo Seiki Seisakusho Co., Ltd.) set at 180 ° C. Kneading was repeated 4 times to obtain resin pellets of Example 1 (cellulose nanofiber content: 30% by mass).

[Example 2]
[Cellulose Nanofiber (CNF) Content: Production of 10% by Mass of Resin Pellets]
In the same manner as in Example 1, 12 parts by mass of CNF primary masterbatch pellets obtained by [Production of primary masterbatch] in Example 1, 87 parts by mass of polypropylene, and 1 part by mass of maleic anhydride-modified polypropylene were used. The resin pellets of Example 2 (cellulose nanofiber content: 10% by mass) were obtained by kneading by a method.

[Example 3] [Cellulose nanofiber (CNF) content: production of 20% by mass of resin pellets]
The resin pellet obtained in Example 1 (cellulose nanofiber content: 30% by mass) and the resin pellet obtained in Example 2 (cellulose nanofiber content: 10% by mass) have a mass ratio of 1: 1. Were mixed and kneaded to obtain a compound (resin pellets of Example 3 (cellulose nanofiber content: 20% by mass)).

[Example 4] [Cellulose nanofiber (CNF) content: production of 50% by mass of resin pellets]
60.2 parts by mass of CNF primary masterbatch pellets obtained by [Production of primary masterbatch] in Example 1, 35 parts by mass of polypropylene, and 4.8 parts by mass of maleic anhydride-modified polypropylene 1 to obtain resin pellets of Example 4 (cellulose nanofiber content: 50% by mass).

[Comparative Example] Polypropylene resin pellets Commercially available polypropylene resin pellets (product name: J3021GR, manufactured by Prime Polymer Co., Ltd.) were used as comparative examples.

<Evaluation>
[Evaluation of mixability]
Twin-screw extrusion using 10 parts by mass of resin pellets (cellulose nanofiber (CNF) content: 30% by mass) of Example 1 and 90 parts by mass of the polypropylene in [Production of premixed product] in Example 1 When kneaded with a machine, a good mixed product having a cellulose nanofiber (CNF) content of 3% by mass was obtained. Thereby, it was confirmed that the resin pellet of Example 1 can be diluted well and used as a secondary masterbatch compound.

[Evaluation of dispersibility]
Films were formed from the cellulosic fiber-containing resin pellets of Examples 1 to 4 using a hot press molding machine at 180 ° C. As a result, it was visually confirmed that any resin pellet could be suitably molded and was excellent in dispersibility.

[Tensile test / Bending test]
The cellulosic fiber-containing resin pellets obtained in Examples 1 to 3 and the resin pellets of the comparative example were molded with a pneumatic injection molding machine set at 180 ° C., and dumbbell-shaped test pieces according to JIS K 7161 A strip-shaped test piece according to JIS K 7171 was obtained.

Then, using the above-mentioned dumbbell-shaped test piece, a tensile test according to JIS K 7161 was performed, and tensile yield strength, tensile elastic modulus, and tensile fracture nominal strain were measured. Further, a bending test according to JIS K 7171 was performed using the above strip-shaped test piece, and the bending elastic modulus was measured. The results are shown in Table 1.

 

 

From Table 1, it was confirmed that any of the cellulose-based fiber-containing resin pellets obtained by Examples is excellent in both tensile properties and bending properties.

2. Test Example 2: Dispersion of lignocellulose nanofiber (LCNF) in polypropylene resin <Preparation of sample>
[Example 5] Lignocellulose nanofiber (LCNF) content: 30% by mass of resin pellets [Production of LCNF primary masterbatch]
A mixture of 100 parts by weight of lignocellulose nanofiber (product name: Serfim powder, average thickness: 50 to 300 nm, manufactured by Mori Machinery Co., Ltd.), 10 parts by weight of HS crystal and 8 parts by weight of maleic anhydride-modified polypropylene. Obtained. 50 parts by weight of water is added to 100 parts by weight of this mixture and mixed with a high-speed stirrer. Using a disk-type extrusion granulator, the lignocellulose nanofibers are coated with a sharp melt crystalline resin and extruded. “LCNF primary masterbatch pellet” was obtained.

[Lignocellulose nanofiber (LCNF) content: Production of resin pellets of 30% by mass]
After the LCNF primary master batch pellet was dried with a hot air dryer, 100 parts by mass of LCNF master batch pellets and 167 parts by mass of polypropylene (product name: BC3AD, manufactured by Nippon Polypro Co., Ltd.) were set to 180 ° C. It knead | mixed with the screw extruder. Kneading was repeated three times to obtain resin pellets of Example 5 (lignocellulose nanofiber content: 30% by mass).

[Example 6] Lignocellulose nanofiber (LCNF) content: 20% by mass of resin pellets [Lignocellulose nanofiber (LCNF) content: production of 20% by mass of resin pellets]
Lignocellulose nanofiber content obtained in Example 5: 100 parts by mass of resin pellets of 30% by mass and 50 parts by mass of polypropylene used in Example 5 were mixed, and once in the same manner as in Example 5. The mixture was kneaded to obtain resin pellets having a lignocellulose nanofiber content of 20% by mass.

[Example 7] Lignocellulose nanofiber (LCNF) content: 10 mass% resin pellets [Lignocellulose nanofiber (LCNF) content: production of 10 mass% resin pellets]
Lignocellulose nanofiber content obtained in Example 5: 100 parts by mass of resin pellets of 30% by mass and 200 parts by mass of polypropylene used in Example 5 were mixed, and once in the same manner as in Example 5. The mixture was kneaded to obtain resin pellets having a lignocellulose nanofiber content of 10% by mass.

[Comparative Example 2] Polypropylene resin pellets The polypropylene resin pellets used in Examples 5 to 7 were used as comparative examples.

<Evaluation>
[Evaluation of dispersibility]
Films were formed from the lignocellulosic fiber-containing resin pellets of Examples 5 to 7 at 180 ° C. using a hot press molding machine. As a result, it was visually confirmed that any resin pellet could be suitably molded and was excellent in dispersibility.

[Tensile test / Bending test]
The lignocellulosic fiber-containing resin pellets obtained in Examples 5 to 7 and the resin pellet of Comparative Example 2 were molded with a 50T injection molding machine set at 180 ° C., and dumbbell-shaped test pieces according to JIS K 7161 Got.

And the tensile test according to JISK7161 was done using said dumbbell-shaped test piece, and the tensile yield strength and the tensile elasticity modulus were measured. Moreover, the bending test according to JISK7171 was done and the bending elastic modulus was measured. The results are shown in Table 2.

 

 

From Table 2, it was confirmed that any of the cellulose-based fiber-containing resin pellets obtained according to the examples was excellent in both tensile properties and bending properties.

3. Test Example 3: Dispersion of cellulose nanofiber (CNF) in polyoxymethylene resin <Preparation of sample>
[Example 8] Cellulose nanofiber content: 30% by mass POM resin pellets [Production of CNF primary masterbatch 2]
About 90 parts by mass of cellulose nanofiber (Product name: Serfim powder, average thickness: 30 to 200 nm, manufactured by Mori Machinery Co., Ltd.), 10 parts by mass of HS crystal and 8 parts by mass of maleic anhydride-modified polypropylene were mixed. The mixture was heated to 100 ° C. to obtain a mixture. 15 parts by mass of hot water is added to 100 parts by mass of this mixture and mixed. Using a pressure-type extrusion granulator as in Example 1, cellulose nanofibers are coated with sharp melt crystalline resin and extruded. "CNF primary masterbatch pellet 2" was obtained.

[Production of cellulose nanofiber (CNF) content: 30% by mass POM resin pellets]
After drying the CNF primary masterbatch pellet 2 obtained by the above [Production of CNF primary masterbatch 2] with a vacuum dryer, 100 parts by mass of CNF masterbatch pellets and 167 parts by mass of polyoxymethylene resin (product name: M90) -44, manufactured by Polyplastics Co., Ltd.) was kneaded in a small lab plast mill twin screw extruder (manufactured by Toyo Seiki Seisakusho Co., Ltd.) set at 180 ° C. Kneading was repeated 3 times to obtain POM resin pellets having a cellulose nanofiber content of 30% by mass.

Cellulose nanofiber (CNF) content: 5 mass% POM resin pellet [Example 9]
[Production of Cellulose Nanofiber (CNF) Content: 5% by Mass of Resin Pellets]
100 parts by mass of the resin pellets (cellulose nanofiber content: 30% by mass) obtained in Example 8 and 500 parts by mass of the polyoxymethylene resin used in Example 8 were mixed, and the same method as in Example 8 was used. Kneaded once to obtain POM resin pellets having a cellulose nanofiber content of 5% by mass.

<Evaluation>
[Evaluation of dispersibility]
Films were formed from the cellulosic fiber-containing resin pellets of Examples 8 to 9 at 180 ° C. using a hot press molding machine. As a result, it was visually confirmed that any resin pellet could be suitably molded and was excellent in dispersibility.

Moreover, it was molded with a pneumatic injection molding machine set at 180 ° C., and it was confirmed that dumbbell-shaped test pieces according to JIS K 7161 were also moldable.

4). Test Example 4: Dispersion of cellulose nanofiber (CNF) in polyamide 11 resin <Preparation of sample>
[Example 10] Cellulose nanofiber (CNF) content: 30% by mass polyamide 11 resin pellets [Cellulose nanofiber (CNF) content: production of 30% by mass polyamide 11 resin pellets]
After drying the CNF primary master batch pellet 2 obtained by [Production of CNF primary master batch 2] in Example 8 with a vacuum dryer, 100 parts by mass of CNF master batch pellets and 167 parts by mass of polyamide 11 resin dried with hot air (Product name: Rilsan BMNO, manufactured by Arkema Co., Ltd.) was kneaded in a small lab plast mill twin screw extruder set at 210 ° C. to obtain a nylon 11 resin pellet having a cellulose nanofiber content of 30% by mass.

<Evaluation>
[Evaluation of dispersibility]
A film was formed from the cellulosic fiber-containing resin pellets of Example 10 at 210 ° C. with a hot press molding machine. As a result, it was visually confirmed that it could be suitably molded and was excellent in dispersibility.

Moreover, it was molded with a pneumatic injection molding machine set to 210 ° C., and it was confirmed that dumbbell-shaped test pieces according to JIS K 7161 were also moldable.

5). Test Example 5: Dispersion of cellulose nanofiber (CNF) in EPDM rubber <Preparation of sample>
[Example 11] Cellulose nanofiber (CNF) content: 7.5% by mass of EPDM rubber mixture [Production of cellulose nanofiber (CNF) content: 7.5% by mass of EPDM rubber mixture]
After the CNF primary masterbatch pellet 2 obtained by [Production of CNF primary masterbatch 2] in Example 8 was dried in a vacuum dryer, 10 parts by mass of CNF masterbatch pellets and 130 parts by mass of EPDM green rubber were added to 180 parts. The mixture was kneaded four times with a small lab plast mill twin screw extruder set at ° C. to obtain an EPDM rubber mixture having a cellulose nanofiber content of 7.5% by mass.

<Evaluation>
[Evaluation of dispersibility]
A film was formed from the cellulosic fiber-containing EPDM rubber of Example 11 at 180 ° C. with a hot press molding machine. As a result, it was visually confirmed that it could be suitably molded and was excellent in dispersibility.

Claims (5)

(A) a cellulosic fiber;
(B) at least one coating composition selected from the group consisting of a sharp melt crystalline resin material having a melting point of 40 ° C. or higher and 155 ° C. or lower, a lubricant, a dispersant, and a compatibilizing agent,
A cellulosic fiber masterbatch having a coating binding layer made of the coating composition (B) on the surface of the cellulose fiber (A). (A) a cellulosic fiber;
(B) at least one coating composition selected from the group consisting of a sharp melt crystalline resin material having a melting point of 40 ° C. or higher and 155 ° C. or lower, a lubricant, a dispersant, and a compatibilizing agent;
(C) a base resin having a melting point or softening point of 80 ° C. or higher and 250 ° C. or lower,
On the surface of the (A) cellulosic fiber, it has a coating layer made of the (B) coating composition,
The (A) cellulosic fiber having the coating layer is dispersed in the (C) base resin,
When the total of the (A) cellulosic fiber and the (C) base resin is 100 parts by mass, the (A) cellulosic fiber 60 to 2 parts by mass and the (C) base resin 40 parts by mass to Cellulosic fiber-containing resin composition containing 98 parts by mass. A molded article formed by molding the cellulose-based fiber-containing resin composition according to claim 2 alone or in combination with another base resin. (A) a cellulosic fiber, and (B) at least one coating composition selected from the group consisting of a sharp melt crystalline resin material having a melting point of 40 ° C. or higher and 155 ° C. or lower, a lubricant, a dispersant, and a compatibilizer. A method for producing a cellulosic fiber masterbatch, comprising the step of mixing (A) the cellulosic fiber with the (B) coating composition. Including the step of kneading the cellulosic fiber masterbatch according to claim 1 with (C) a base resin having a melting point or softening point of 80 ° C. or higher and 250 ° C. or lower to obtain resin pellets;
The resin pellets obtained by kneading, when the total of (A) cellulosic fibers and (C) base resin is 100 parts by mass, (A) cellulosic fibers 60 to 2 parts by mass And (C) a method for producing a cellulosic fiber-containing resin composition comprising 40 parts by mass to 98 parts by mass of the base resin.