Resin composition, molded article, vehicle, and method for producing resin composition

Abstract

Provided is a resin composition containing a woody biomass roasted product excellent in moldability and impact resistance while suppressing the content of a synthetic resin derived from petroleum resources according to the carbon neutral theory.　The present invention provides a resin composition containing a woody biomass roasted product (A) and a thermoplastic resin (B), wherein: the thermoplastic resin (B) contains a polypropylene-based resin (B1) and a copolymerized polyolefin resin (B2); the mass ratio (B2 / (B1 + B2)) of the copolymerized polyolefin resin (B2) to the total mass of the polypropylene-based resin (B1) and the copolymerized polyolefin resin (B2) is more than 0.00 and less than 0.80; and the mass ratio (B2 / A) of the copolymerized polyolefin resin (B2) to the woody biomass roasted product (A) is more than 0.00 and less than 1.00. Note that the copolymerized polyolefin resin (B2) excludes the polypropylene-based resin (B1).

Description

Resin composition, molded article, vehicle, and method for producing resin composition

[0001] The present invention relates to a resin composition, a molded article, a vehicle, and a method for producing a resin composition.

[0002] In recent years, biomass materials have been widely used in the materials field as an alternative to fossil fuels, from the perspective of combating global warming and building a recycling-oriented society. Here, biomass materials refer to materials derived from living organisms such as plants. Because biomass materials are organic, they emit carbon dioxide when burned. However, the carbon contained in them comes from carbon dioxide absorbed from the atmosphere by photosynthesis during the biomass growth process, so it is safe to say that the use of biomass materials does not increase the amount of carbon dioxide in the atmosphere overall. This property is called carbon neutral.

[0003] As a way of putting the carbon neutral concept into practice, many technological developments have been made on wood flour-filled resin compositions in which wood flour, a biomass material, is blended with thermoplastic resin materials such as polyethylene and polypropylene.

[0004] In particular, it is known that semi-carbonizing and finely pulverizing wood flour before blending with a thermoplastic resin increases uniform dispersion with the thermoplastic resin, and that adding an acid-modified polyolefin further increases moldability (Patent Document 1).

[0005] Japanese Patent Application Laid-Open No. 2023-035364

[0006] However, the resin molded product obtained from the resin molding material containing woody biomass roasted material described in Patent Document 1 has significantly reduced impact resistance, as represented by Charpy impact strength, due to the rigidity of the woody biomass and, in some cases, the amount of acid-modified polyolefin added being excessive relative to the woody biomass roasted material.

[0007] An object of the present invention is to provide a resin composition containing woody biomass roasted material that has excellent moldability and impact resistance while reducing the content of synthetic resins derived from petroleum resources by using woody biomass, in accordance with the concept of carbon neutrality.

[0008] The present invention can reduce the content of synthetic resins derived from petroleum resources, and therefore can contribute to the achievement of Goal 7 of the SDGs (Sustainable Development Goals). The present invention relates to, for example, the following [1] to

[24] . [1] A resin composition comprising: a woody biomass roasted product (A) and a thermoplastic resin (B), wherein the thermoplastic resin (B) comprises a polypropylene-based resin (B1) and a copolymerized polyolefin resin (B2), wherein a mass ratio (B2 / (B1+B2)) of the copolymerized polyolefin resin (B2) to the total mass of the polypropylene-based resin (B1) and the copolymerized polyolefin resin (B2) is more than 0.00 and less than 0.80, and wherein a mass ratio (B2 / A) of the copolymerized polyolefin resin (B2) to the woody biomass roasted product (A) is more than 0.00 and less than 1.00. [2] A resin composition comprising a woody biomass roasted material (A), a thermoplastic resin (B') having no acidic group, and a polyhydroxycarboxylic acid (C1), wherein the content of the polyhydroxycarboxylic acid (C1) relative to 100% by mass of the resin composition is more than 0.0% by mass and less than 8.0% by mass, and the mass ratio (C1 / A) of the polyhydroxycarboxylic acid (C1) to the woody biomass roasted material (A) is more than 0.00 and less than 0.40. [3] A resin composition comprising a woody biomass roasted product (A), a thermoplastic resin (B') having no acidic groups, and an acid-modified polyolefin resin (C2), wherein the content of the acid-modified polyolefin resin (C2) relative to 100% by mass of the resin composition is more than 0.00% by mass and less than 1.00% by mass, and the mass ratio (C2 / A) of the acid-modified polyolefin resin (C2) to the woody biomass roasted product (A) is more than 0.0000 and less than 0.1000. [4] The resin composition of any of [1] to [3], wherein the woody biomass roasted product (A) is a crushed product, and the average particle size thereof is 20 μm or more and 600 μm or less.[5] The resin composition of any one of [1] to [4], wherein the mass ratio (B2 / (B1+B2)) of the copolymerized polyolefin resin (B2) to the total mass of the polypropylene-based resin (B1) and the copolymerized polyolefin resin (B2) is more than 0.00 and not more than 0.20. [6] The resin composition of any one of [1] to [5], wherein the polypropylene-based resin (B1) contains at least one selected from the group consisting of a propylene homopolymer and a propylene-ethylene block copolymer. [7] The resin composition of any one of [1] to [6], wherein the copolymerized polyolefin resin (B2) is an ethylene-α-olefin copolymer. [8] The Charpy impact strength measured in accordance with JIS K6921-2:2018 is 4.5 kJ / m. ２[9] The resin composition of any one of [1] to [8], wherein the content of the woody biomass roasted material (A) relative to 100% by mass of the resin composition is 5% by mass or more and 60% by mass or less.

[10] A molded product formed from the resin composition of any one of [1] to [9].

[11] A vehicle equipped with the molded product according to

[10] .

[12] A method for producing a resin composition, comprising a step of heat-kneading woody biomass roasted material (A) and a thermoplastic resin (B) at 180°C or higher and 230°C or lower, wherein the thermoplastic resin (B) comprises a polypropylene-based resin (B1) and a copolymerized polyolefin resin (B2), the mass ratio (B2 / (B1+B2)) of the copolymerized polyolefin resin (B2) to the total mass of the polypropylene-based resin (B1) and the copolymerized polyolefin resin (B2) is more than 0.00 and less than 0.80, and the mass ratio (B2 / A) of the woody biomass roasted material (A) to the copolymerized polyolefin resin (B2) is more than 0.00 and less than 1.00, with the proviso that the copolymerized polyolefin resin (B2) excludes the polypropylene-based resin (B1).

[13] The method for producing a resin composition according to

[12] , wherein pre-crushed woody biomass roasted material (A) is used in the heat-kneading step, and the pre-crushed material has an average particle size of 15 mm or less.

[14] The resin composition according to any one of [2] to [9], wherein the content of the polyhydroxycarboxylic acid (C1) relative to 100% by mass of the resin composition is more than 0.0% by mass and not more than 6.0% by mass.

[15] The resin composition according to any one of [2] to [9] and

[14] , wherein the polyhydroxycarboxylic acid (C1) comprises at least one selected from the group consisting of polylactic acid, polyglycolic acid, polycaprolactone, poly-3-hydroxybutyric acid, and poly-4-hydroxybutyric acid.

[16] The resin composition according to any one of [2] to [9] and

[14] to

[15] , wherein the content of the polyhydroxycarboxylic acid (C1) relative to 100% by mass of the resin composition is more than 0.0% by mass and less than 3.0% by mass.

[17] The resin composition according to any one of [2] to [9] and

[14] to

[16] , wherein the thermoplastic resin (B') comprises a polypropylene-based resin.

[18] A method for producing a resin composition, comprising a step of heat-kneading woody biomass roasted product (A), a thermoplastic resin (B') having no acidic groups, and a polyhydroxycarboxylic acid (C1) at 190°C or higher and 230°C or lower, wherein a content of the polyhydroxycarboxylic acid (C1) relative to 100% by mass of the resin composition is more than 0.0% by mass and less than 8.0% by mass, and a mass ratio (C1 / A) of the polyhydroxycarboxylic acid (C1) relative to the woody biomass roasted product (A) is more than 0.00 and less than 0.40.

[19] The method for producing the resin composition according to

[18] , wherein the heat-kneading step uses pre-crushed woody biomass roasted product (A), and the pre-crushed product has an average particle size of 15 mm or less.

[20] The resin composition according to any of [2] to [9], wherein a content of the acid-modified polyolefin resin (C2) relative to 100% by mass of the resin composition is more than 0.00% by mass and less than 0.10% by mass.

[21] The resin composition of any one of [2] to [9] and

[20] , wherein the acid-modified polyolefin resin (C2) comprises at least one selected from the group consisting of maleic anhydride-modified polyethylene resins, maleic anhydride-modified polypropylene homopolymers, maleic anhydride-modified polypropylene copolymers, and ethylene-(meth)acrylic acid copolymers.

[22] The resin composition of any one of [2] to [9] and

[20] to

[21] , wherein the thermoplastic resin (B') comprises a polypropylene resin.

[23] A method for producing a resin composition, comprising a step of heat-kneading woody biomass roasted product (A), a thermoplastic resin (B') having no acidic groups, and an acid-modified polyolefin resin (C2) at 190°C or higher and 230°C or lower, wherein a content of the acid-modified polyolefin resin (C2) relative to 100% by mass of the resin composition is more than 0.00% by mass and less than 1.00% by mass, and a mass ratio (C2 / A) of the acid-modified polyolefin resin (C2) to the woody biomass roasted product (A) is more than 0.0000 and less than 0.1000.

[24] The method for producing a resin composition according to

[23] , wherein the heat-kneading step uses pre-crushed woody biomass roasted product (A), and the pre-crushed product has an average particle size of 15 mm or less.

[0009] The resin composition of the present invention can provide a molded article that is excellent in moldability and impact resistance while reducing the content of synthetic resins derived from petroleum resources.

[0010] <First Aspect> <First Embodiment: Resin Composition> A first embodiment of the first aspect of the present invention is a resin composition comprising a woody biomass roasted product (A) and a thermoplastic resin (B), wherein the thermoplastic resin (B) comprises a polypropylene-based resin (B1) and a copolymerized polyolefin resin (B2), wherein the mass ratio (B2 / (B1+B2)) of the copolymerized polyolefin resin (B2) to the total mass of the polypropylene-based resin (B1) and the copolymerized polyolefin resin (B2) is more than 0.00 and less than 0.80, and the mass ratio (B2 / A) of the copolymerized polyolefin resin (B2) to the woody biomass roasted product (A) is more than 0.00 and less than 1.00, with the proviso that the copolymerized polyolefin resin (B2) excludes the polypropylene-based resin (B1).

[0011] A resin composition according to a first aspect of the present invention includes a woody biomass roasted material (A) and a thermoplastic resin (B). The thermoplastic resin (B) includes a polypropylene-based resin (B1) and a copolymer polyolefin resin (B2). However, the copolymer polyolefin resin (B2) excludes the polypropylene-based resin (B1).

[0012] The resin composition of the first aspect of the present invention has a Charpy impact strength of 4.5 kJ / m as measured in accordance with JIS K6921-2:2018. ２ It is preferable that the concentration is 4.5 kJ / m or more. ２ More preferably, more than 4.6 kJ / m ２ More preferably, 4.8 kJ / m or more ２ More than 5.0 kJ / m is particularly preferred. ２ In this specification, the specific method for measuring the Charpy impact strength can be determined by referring to the method described in the Examples or a similar method.

[0013] [Woody Biomass Roasted Product] The woody biomass roasted product (A) used in the present invention is obtained by roasting woody biomass. Here, torrefaction refers to a treatment in which the material is heated in a low-oxygen atmosphere at a temperature lower than that of a so-called carbonization treatment. A low-oxygen atmosphere means, for example, an oxygen concentration of 10% or less, or may be oxygen-free. If the oxygen concentration during roasting exceeds 10%, the material yield and calorific yield may decrease.

[0014] The wood used as the raw material for the woody biomass of the woody biomass torrefaction product is not particularly limited in terms of species or part, and both broad-leaved and coniferous trees can be used. Furthermore, plant residues can also be used as the woody biomass. Specific examples of broad-leaved trees include, but are not limited to, eucalyptus, rubber tree, beech, Chinese linden, white birch, poplar, acacia, oak, sugar maple, Asian elm, paulownia, magnolia, willow, Japanese ash, phillyraeoides phillyraeoides, oak, sawtooth oak, horse chestnut, zelkova, beech, dogwood, and ash. Examples of conifers include cedar, spruce, larch, black pine, Abies sachalinensis, Himekomatsu, yew, juniper, spruce, Japanese spruce, Japanese holly, Japanese holly, fir, Japanese holly, Japanese bead, fir, Japanese sawara, Doga sawara, Asunaro, hiba, tsuga, divers' hemlock, Japanese cypress, yew, Japanese yew, spruce, yellow cedar (Thujopsis thunbergii), Lawson cypress (Hinoki), Douglas-fir (Douglas-fir), Sitka spruce (Sitka spruce), Radiata pine, eastern spruce, eastern white pine, western larch, western fir, western hemlock, and tamarack. Examples of plant residues include almond shells, walnut shells, and empty fruit bunches (EFB) (palm oil processing residue). The woody biomass may be one of these or a mixture of two or more of these.

[0015] The heating temperature in the roasting process of woody biomass to obtain woody biomass roasted material is determined appropriately depending on the shape and size of the raw biomass and aggregates, but is preferably 150 to 400°C, more preferably 200 to 350°C, even more preferably 230 to 300°C, and particularly preferably 250 to 290°C.

[0016] In this specification, the term "lumps" refers to solid materials obtained by molding biomass raw materials containing biomass. The lumps are not particularly limited, but examples thereof include pellets and briquettes. The size, shape, density, etc. of the lumps are not particularly limited.

[0017] The temperature for carbonizing wood is typically 400 to 700°C, but roasting woody biomass at this temperature produces a woody biomass roasted product with a higher energy density than the raw woody biomass. The heating time in the roasting step is not particularly limited, but is preferably 0.1 to 5 hours, and more preferably 0.2 to 3 hours. Woody biomass roasted product can also be obtained using the raw materials and production method described in WO 2019 / 069849, for example. In woody biomass roasted product, solid cross-linking occurs due to roasting, maintaining the connection or adhesion between the biomass powders.

[0018] From the viewpoints of safety and handling, the shape of the woody biomass before roasting is preferably formed into pellets or briquettes by compressing and molding the raw woody biomass. From the viewpoints of safety and handling, the size of the pellets is preferably such that the average long side length is 1 mm or more and 30 mm or less. The woody biomass roasted product obtained by roasting the woody biomass is usually formed into a pellet-shaped or briquette-shaped body.

[0019] From the viewpoint of moldability and impact resistance, the woody biomass roasted material preferably has a crushability index (HGI) based on JIS M 8801:2008 of 15 or more and 60 or less, more preferably 20 or more and 60 or less. By using a material with an HGI within this range, the average particle size of the crushed woody biomass roasted material (A) described below can be controlled, which facilitates uniform kneading with the polypropylene resin (B1) and the copolymer polyolefin resin (B2), and also facilitates molding by injection molding or the like.

[0020] In addition, from the viewpoint of moldability and impact resistance, the woody biomass roasted material has a BET specific surface area of ​​0.15 to 0.8 m ２ / g, and 0.15 to 0.7 m ２The woody biomass roasted material preferably has an equilibrium moisture content after immersion in water of 15 to 65 mass %, more preferably 15 to 60 mass %.

[0021] If the bulk density of the unheated aggregates of woody biomass before the roasting step is X and the bulk density of the heated solid material of woody biomass after the roasting step (crushed woody biomass roasted material (A)) is Y, then from the viewpoint of moldability and impact resistance, Y / X is preferably 0.7 to 1, and more preferably 0.8 to 0.95. The value of bulk density X is not particularly limited as long as it is within a known range in which unheated aggregates can be obtained by molding the raw material woody biomass. Furthermore, since bulk density varies depending on the type of raw material woody biomass, it may be set appropriately.

[0022] The woody biomass roasted product (A) is preferably a crushed product. Crushed woody biomass roasted product (A) can be obtained, for example, by crushing the woody biomass roasted product (A) when the woody biomass roasted product (A) is heated and kneaded with the polypropylene resin (B1) and the copolymer polyolefin resin (B2). The crushed product referred to here means that the woody biomass roasted product (A) before heating and kneading has been crushed from a pellet- or briquette-shaped compact, and the shape of the crushed product is not particularly limited and may be irregular. From the viewpoint of shortening the production process, it is preferable to simultaneously crush the woody biomass roasted product (A) while heating and kneading the woody biomass roasted product (A), the polypropylene resin (B1), and the copolymer polyolefin resin (B2). On the other hand, from the viewpoint of smoothly feeding the woody biomass roasted material (A) to an optional extruder described below, the woody biomass roasted material (A) may be pre-pulverized as appropriate before feeding to form pre-crushed material, which may then be fed into the extruder. The shape of the pre-crushed material is not particularly limited, and the size thereof may be set to a size that allows it to be fed into an optional extruder described below. The average particle size of the pre-crushed material may be, for example, 15 mm or less, or it may be crushed even finer.

[0023] Examples of the crusher used when crushing the woody biomass torrefaction product (A) by pre-pulverization include, but are not limited to, a ball mill, a rod mill, a bead mill, a conical mill, a disc mill, an edge mill, a hammer mill, a mortar, a pellet mill, a VSI mill, a Willy mill, a roller mill, a jet mill, and a mass colloider.

[0024] [Average particle size of crushed woody biomass roasted product (A)] The average particle size of crushed woody biomass roasted product (A) in the resin composition is preferably 20 to 600 μm, more preferably 30 to 500 μm, and even more preferably 40 to 400 μm. By setting the average particle size within the above range, excellent moldability and impact resistance can be achieved, and further reduction in production costs can be realized. When the average particle size of crushed woody biomass roasted product (A) is within the above range, both moldability and impact resistance can be improved. As described above, the shape of the crushed woody biomass roasted product (A) does not need to be granular and is not particularly limited, and may be amorphous. Furthermore, this average particle size is a value measured after heating and kneading the woody biomass roasted product (A), the polypropylene resin (B1), and the copolymer polyolefin resin (B2). The average particle diameter referred to here is the 50% average particle diameter (D) on a volume basis measured by a laser light scattering method (laser diffraction method) assuming that the crushed woody biomass roasted material (A) has a particle shape. ５０ ), and can be measured using a laser diffraction particle size analyzer ("LA-9500V2" manufactured by Horiba, Ltd.). The average particle size of the crushed woody biomass roasted product (A) in the resin composition can be measured, for example, by dissolving the resin in the resin composition in a good solvent for the resin, and filtering the insoluble woody biomass roasted product (A) to separate the soluble and insoluble components, a process known as dissolution-separation. The woody biomass roasted product (A) component is then recovered and measured. Based on the measurement results, the average particle size of the woody biomass roasted product (A) can be controlled by, for example, adjusting the feed position of the woody biomass roasted product (A) into an arbitrary extruder.

[0025] [Thermoplastic Resin (B)] The thermoplastic resin (B) in the present invention can be any resin that can be plasticized and molded by heat, but it should at least include the polypropylene-based resin (B1) and copolymer polyolefin resin (B2) described below. The thermoplastic resin (B) may further include resins other than the polypropylene-based resin (B1) and copolymer polyolefin resin (B2) to the extent that the effects of the present invention are not impaired. Examples of such resins include polyethylenes such as low-density polyethylene, linear low-density polyethylene, very low-density polyethylene, and high-density polyethylene; polyolefin resins such as polybutene, polyisobutylene, and polymethylpentene; polyacetal resins such as polyoxymethylene; thermoplastic elastomers such as styrene-based elastomers, polyolefin-based elastomers, polyester-based elastomers, and polyamide-based elastomers; and ion-crosslinked olefin copolymers (ionomers). It is preferable that the thermoplastic resin (B) does not have an acidic group. The term "acidic group" refers to a group that liberates a proton, and examples thereof include a carboxyl group, a sulfonic acid group, a phosphoric acid group, and a phenolic hydroxyl group. Hydroxyl groups (excluding phenolic hydroxyl groups) are not included in the acidic group. The term "acidic group" also includes groups derived from acidic groups such as acid ester groups and acid anhydride groups.

[0026] [Polypropylene Resin (B1)] In the present invention, the polypropylene resin (B1) refers to a resin having at least a repeating unit derived from propylene. Examples of such resins include propylene homopolymers, propylene-ethylene block copolymers, propylene-ethylene-1-butene block copolymers, propylene-ethylene random copolymers, propylene-1-butene random copolymers, propylene-ethylene-1-butene random copolymers, propylene-ethylene random block copolymers, propylene-ethylene-1-butene random block copolymers, propylene-hexene random copolymers, propylene-octene random copolymers, and ethylene-propylene-1-butene copolymers. From the viewpoints of ease of handling and the balance of physical properties of the thermoplastic resin (B), the polypropylene resin (B1) preferably contains at least one selected from the group consisting of propylene homopolymers and propylene-ethylene block copolymers. The polypropylene resin (B1) may be entirely or partially derived from plants.

[0027] [Copolymerized Polyolefin Resin (B2)] The copolymerized polyolefin resin (B2) refers to a polymer derived from at least two different types of monomers, and is preferably a copolymerized polyolefin resin (ethylene-α-olefin copolymer) derived from two different types of monomers selected from the group consisting of ethylene and α-olefins having 4 to 18 carbon atoms. Examples of the monomer include ethylene, 1-butene, 1-hexene, 1-octene, 1-decene, 1-hexadecene, 1-eicosene, 4-methyl-1-pentene, 3-methyl-1-butene, vinylcyclohexane, cyclopentene, cyclohexene, cyclooctene, norbornene, 1,3-butadiene, isoprene, 1,5-cyclooctadiene, norbornadiene, 5-vinyl-2-norbornene, 5-phenyl-2-norbornene, dimethanooctahydronaphthalene, ethylidenenorbornene, dicyclopentadiene, and 1,4-hexadiene.

[0028] Examples of the copolymerized polyolefin resin (B2) made from the above monomers include polyethylene-based resins such as ethylene-butene copolymer, ethylene-hexene copolymer, ethylene-octene copolymer, and ethylene-vinyl alcohol copolymer, butyl rubber, halogenated butyl rubber, and cyclic olefin copolymers. From the viewpoint of compatibility with the polypropylene-based resin (B1), a copolymer having a repeating unit derived from 1-butene is preferably used, and an ethylene-1-butene copolymer is more preferably used. The copolymerized polyolefin resin (B2) may be entirely or partially derived from plants.

[0029] [Other Resins (C)] In the resin composition of the first aspect of the present invention, resin components (other resins (C)) other than the polypropylene-based resin (B1) and the copolymerized polyolefin resin (B2) may be present to the extent that the effects of the present invention are not impaired. As the other resin (C), any resin that can be plasticized and molded by heat can be used, and it may be a plant-derived resin or a biodegradable resin. By having a plant-derived resin present in the resin composition of the first aspect of the present invention, it is possible to reduce components derived from petroleum resources.

[0030] In the resin composition of the first aspect of the present invention, the content of the other resin (C) relative to 100 parts by mass of the total of the polypropylene-based resin (B1) and the copolymerized polyolefin resin (B2) is preferably 7.0 parts by mass or less, more preferably 5.0 parts by mass or less, and even more preferably 1.0 part by mass or less.

[0031] Examples of biodegradable resins having thermoplastic properties include, but are not limited to, polylactic acid (PLA), polyhydroxyalkanoates (PHAs), polybutylene succinate, polyethylene succinate, polyglycol, polycaprolactone, polyvinyl alcohol, and the like.

[0032] As the other resin (C), polylactic acid is preferred. The polylactic acid is not particularly limited, but for example, L-lactic acid, D-lactic acid, D,L-lactic acid, stereocomplex polylactic acid consisting of a mixture of L-lactic acid and D-lactic acid, and mixtures thereof can be preferably used. Among these, polylactic acid mainly composed of L-lactic acid is preferred from the viewpoints of biodegradability and moldability. The content of the D-isomer in 100 mol% of polylactic acid is 0 to 7 mol%, preferably 0.01 to 6.0 mol%, and more preferably 0.1 to 1.0 mol%.

[0033] The ratio of L- and D-isomers constituting polylactic acid (optical isomer ratio) can be determined by separating the lactic acid obtained by hydrolyzing it into L-lactic acid and D-lactic acid using high performance liquid chromatography equipped with an optical isomer separation column, and then quantifying them. Examples of the hydrolysis method include mixing polylactic acid with a sodium hydroxide / methanol mixed solution using a water bath shaker set at 65°C. When quantifying using high performance liquid chromatography, it is preferable to use a sample that has been neutralized in advance with a dilute hydrochloric acid solution or the like.

[0034] From the viewpoint of moldability, the polylactic acid preferably has a melt flow rate (MFR) at 190°C and 2.16 kg measured in accordance with JIS K7210-1:2014 of 0.3 to 30 g / 10 min, more preferably 1 to 25 g / 10 min, even more preferably 2 to 20 g / 10 min, and particularly preferably 5 to 15 g / 10 min.

[0035] From the viewpoint of moldability, the polylactic acid preferably has a melting point of 140 to 210°C, more preferably 150 to 200°C, and even more preferably 160 to 190°C, as measured by differential scanning calorimetry (hereinafter sometimes referred to as DSC).

[0036] Polylactic acid can be produced, for example, by condensation polymerization of lactic acid or ring-opening polymerization of lactide, a cyclic dimer of lactic acid. The polycondensation reaction of lactic acid is a method of esterifying the carboxyl groups and hydroxyl groups of lactic acid, such as by azeotropic dehydration of L-lactic acid, D-lactic acid, or a mixture thereof under reduced pressure in the presence of a high-boiling solvent. The ring-opening polymerization method using lactide is a method of esterifying ring-opened lactides, such as by ring-opening L-lactide or D-lactide in the presence of a polymerization regulator and a polymerization catalyst. Furthermore, D,L-lactide, a dimer of L-lactic acid and D-lactic acid, may be used in combination within the scope of achieving the objects of the present invention.

[0037] Furthermore, as the other resin (C), modified polyolefins or polyhydroxycarboxylic acids (C1) may be used to the extent that the effects of the present invention are not impaired. The modified polyolefin may be, for example, a halogenated polyolefin resin such as chlorinated polyethylene or chlorinated polypropylene, but is preferably a polyolefin resin modified (acid-modified) with an acid (e.g., an unsaturated carboxylic acid) or its anhydride (acid-modified polyolefin resin). Specific examples include maleic anhydride-modified polyethylene resins such as maleic anhydride-modified polyethylene, maleic anhydride-modified polypropylene resins such as maleic anhydride-modified polypropylene, and acid-modified polyolefin resins such as ethylene-(meth)acrylic acid copolymers (particularly ethylene-(meth)acrylic acid graft copolymers). These modified polyolefin resins can be used alone or in combination of two or more. The other resin (C) can be used alone, or two or more can be used as desired.

[0038] The modified polyolefin is preferably an acid-modified polyolefin resin (C2). From the viewpoints of moldability and impact resistance, the acid value of the acid-modified polyolefin resin (C2), measured in accordance with JIS K-0070:1992, is preferably 10 mgKOH / g or more and 100 mgKOH / g or less, more preferably 40 mgKOH / g or more and 60 mgKOH / g or less.

[0039] From the viewpoint of moldability, the acid-modified polyolefin resin preferably has a melting point measured by differential scanning calorimetry (hereinafter sometimes referred to as DSC) of 50 to 200°C, more preferably 80 to 180°C, and even more preferably 100 to 170°C.

[0040] From the viewpoint of moldability, the acid-modified polyolefin resin preferably has a lower limit of polystyrene-equivalent weight average molecular weight (Mw) measured by size exclusion liquid chromatography of 5,000 or more, more preferably 10,000 or more. From the same viewpoint, the acid-modified polyolefin resin preferably has an upper limit of Mw of 500,000 or less, more preferably 300,000 or less.

[0041] From the viewpoint of moldability, the acid-modified polyolefin resin preferably has a lower limit of viscosity when melted of 100 mPa s or more, more preferably 3,000 mPa s or more. From the same viewpoint, the acid-modified polyolefin resin preferably has an upper limit of viscosity when melted of 50,000 mPa s or less, more preferably 20,000 mPa s or less. The viscosity is measured at a temperature of melting point +20°C to 25°C (preferably +22°C).

[0042] [Optional Component (D)] In order to improve the functions and properties of molded articles obtained from the resin composition of the first aspect of the present invention, if necessary, a reinforcing material, a non-plant-based filler, a heat resistance agent, an antioxidant, a weather resistance agent, an anti-deterioration agent such as a light stabilizer, a flowability improver, a mold release agent, a lubricant, etc. may be present.

[0043] Examples of reinforcing materials include glass fiber, carbon fiber, cellulose fiber, graphite fiber, metal fiber, and organic long fibers such as polyester and polyamide fiber. These may also be recycled products.

[0044] Examples of non-plant-based fillers include calcium carbonate, silica, calcium oxide, kaolin, calcined kaolin, clay, calcium silicate, calcium sulfate, aluminum oxide (alumina), aluminum hydroxide, aluminum silicate, titanium oxide, zinc oxide, magnesium carbonate, magnesium silicate, talc, zeolite, glass beads, and shirasu balloons.

[0045] Examples of antioxidants include phosphorus-based, hydroquinone-based, bis-tris-polyphenol-based, thiobisphenol-based, and hindered phenol-based antioxidants.

[0046] Examples of light stabilizers include ultraviolet absorbers such as benzotriazole-based ultraviolet absorbers, benzophenone-based ultraviolet absorbers, salicylate-based ultraviolet absorbers, and cyanoacrylate-based ultraviolet absorbers; hindered amine-based radical scavengers; and quenchers such as nickel complexes.

[0047] Examples of lubricants include hydrocarbon-based lubricants such as liquid paraffin, natural paraffin, microwax, and polyethylene wax; fatty acid amide-based lubricants such as stearic acid amide, palmitic acid amide, and methylene bisstearamide; ester-based lubricants such as butyl acrylate, hydrogenated castor oil, and ethylene glycol monostearate; alcohol-based lubricants such as cetyl alcohol and stearyl alcohol; and metal soap-based lubricants such as zinc stearate, calcium stearate, and lead stearate.

[0048] The resin composition of the first aspect of the present invention may be blended with a known foaming agent or foaming aid, if necessary, so that it can be molded into a foam-molded product. Examples of foaming agents include inorganic foaming agents such as ammonium carbonate and sodium bicarbonate, and organic foaming agents such as dinitrosopentamethylenetetramine, N,N'-dimethyl-N,N'-dinitrosoterephthalate amide, benzenesulfonyl hydrazide, p-toluenesulfonyl hydrazide, p,p'-oxybis(benzenesulfonyl hydrazide), 3,3-disulfonehydrazidephenylsulfone, azobisisobutyronitrile, barium azodicarboxylate, and diethyl azodicarboxylate.

[0049] [Method for Producing Resin Composition] The resin composition contains woody biomass roasted material (A) and a thermoplastic resin (B), where the thermoplastic resin (B) contains a polypropylene resin (B1) and a copolymer polyolefin resin (B2). The resin composition can be obtained by blending and mixing or kneading the above-mentioned components. Mixing or kneading can be performed using a conventional method, such as a ribbon blender, drum tumbler, Henschel mixer, Banbury mixer, single-screw extruder, twin-screw extruder, co-kneader, or multi-screw extruder. The heating temperature during mixing or kneading is preferably 180 to 230°C.

[0050] The content of the woody biomass roasted product (A) is preferably 5 to 60 mass%, more preferably 10 to 50 mass%, and even more preferably 15 to 35 mass%, relative to 100 mass% of the resin composition, from the viewpoints of suppressing the content of synthetic resins derived from petroleum resources and of moldability. The content of the thermoplastic resin (B) is preferably 40 to 94 mass%, more preferably 50 to 90 mass%, and even more preferably 65 to 85 mass%, relative to 100 mass% of the resin composition.

[0051] The mass ratio of the copolymer polyolefin resin (B2) to the total mass of the polypropylene resin (B1) and the copolymer polyolefin resin (B2), (B2 / (B1+B2)), is more than 0.00 and less than 0.80, preferably more than 0.00 and not more than 0.60, more preferably more than 0.00 and not more than 0.20, even more preferably 0.02 or more and not more than 0.08, and particularly preferably 0.03 or more and not more than 0.06. By adjusting the mass ratio within this range, a resin composition containing woody biomass roasted material having excellent moldability and impact resistance can be obtained.

[0052] The mass ratio (B2 / A) of the copolymerized polyolefin resin (B2) to the woody biomass roasted material (A) is more than 0.00 and less than 1.00, preferably 0.05 or more and 0.80 or less, and more preferably 0.15 or more and 0.70 or less. By setting it in this range, a resin composition containing woody biomass roasted material with excellent moldability and impact resistance is obtained. If (B2 / A) is 0.00, the moldability and impact resistance are inferior for the following reasons.

[0053] Due to the provision of the mass ratio (B2 / (B1+B2)), when (B2 / A) is set to 1.00 or more, the total content ratio of the polypropylene-based resin (B1) and the copolymer polyolefin resin (B2) relative to the wood-based biomass roasted product (A) becomes relatively high. As a result, the influence of the polypropylene-based resin (B1) and the copolymer polyolefin resin (B2) becomes greater during molding of the resin composition. Generally, the melting point of the copolymer polyolefin resin (B2) is significantly lower than the melting point of the polypropylene-based resin (B1). When (B2 / A) is 1.00 or more, due to the difference in melting points between the polypropylene-based resin (B1) and the copolymer polyolefin resin (B2), the polypropylene-based resin (B1) or the copolymer polyolefin resin (B2) may melt and solidify (form a bridge) in the piping during molding, making it impossible to mold.

[0054] [Molded Articles of Resin Composition] The resin composition of the first aspect of the present invention can be used in the form of various profile extrusion molded articles, extrusion-molded sheets, films, etc., by various extrusion molding methods (including cold runner and hot runner molding methods, as well as injection compression molding, injection press molding, gas-assisted injection molding, foam molding (including injection of supercritical fluids), insert molding, in-mold coating molding, heat-insulating mold molding, rapid heating and cooling mold molding, two-color molding, sandwich molding, and ultra-high speed injection molding). In addition, inflation, calendaring, casting, and other methods can also be used to mold sheets and films. Furthermore, the resin composition of the first aspect of the present invention can be molded into heat-shrinkable tubes by a specific stretching operation. The resin composition of the first aspect of the present invention can also be formed into hollow molded articles by rotational molding, blow molding, etc.

[0055] The conditions for each molding method are not particularly limited, but the heating temperature of the molding machine is preferably 160 to 270°C, more preferably 170 to 250°C, and even more preferably 180 to 230°C. In the case of molding temperatures when producing a molded article by injection molding, a cylinder temperature of 180 to 230°C and a mold temperature of 10 to 80°C are preferred. This [molded article of a resin composition] also applies to the second and third aspects of the present invention described below.

[0056] [Uses of Resin Composition] The resin composition of the first aspect of the present invention can be molded for various purposes and can be used as a substitute for plastic products. Molded articles formed from the resin composition of the first aspect of the present invention can be widely used, including, for example, trays, automobile parts, interiors such as automobile dashboards, airplane luggage compartments, structural components for transportation equipment, housings for home appliances, electrical appliance components, cards, various containers such as toner containers, building materials, seedling pots, agricultural sheets, writing implements, wooden products, household appliances, straws, cups, toys, sporting goods, port components, building components, generator components, tools, fishing gear, packaging materials, 3D printer models, pallets, food containers, tableware, cutlery (spoons, forks, etc.), chopsticks, and various sheets. When these products are no longer needed, they are discarded. However, even if they are incinerated and carbon dioxide is emitted, the roasted portion of the blended woody biomass can be treated as not increasing the amount of carbon dioxide in the atmosphere.

[0057] Furthermore, resin products formed into exterior materials for office automation equipment and home appliances, for example, exterior materials for personal computers, notebook computers, game consoles, display devices (CRT, LCD, plasma, projectors, organic EL, etc.), mice, printers, copiers, scanners, fax machines (including multifunction devices thereof), keyboard keys, molded switch products, personal digital assistants (so-called PDAs), mobile phones, portable books (dictionaries, etc.), portable televisions, drives for recording media (CDs, MDs, DVDs, next-generation high-density discs, hard disks, etc.), readers for recording media (IC cards, smart media, memory sticks, etc.), optical cameras, digital cameras, parabolic antennas, power tools, VTRs, irons, hair dryers, rice cookers, microwave ovens, audio equipment, lighting equipment, refrigerators, air conditioners, air purifiers, negative ion generators, and typewriters, can be used. The resin composition can also be used in a wide range of applications, such as trays, cups, plates, shampoo bottles, office equipment housings, cosmetic bottles, beverage bottles, oil containers, injection-molded products (golf tees, cotton swab cores, candy sticks, brushes, toothbrushes, helmets, syringes, plates, cups, combs, razor handles, tape cassettes and cases, disposable spoons and forks, stationery such as ballpoint pens, etc.), binding tape (binding bands), prepaid cards, balloons, pantyhose, hair caps, sponges, cellophane tape, umbrellas, raincoats, plastic gloves, hair caps, ropes, tubes, foam trays, foam cushioning materials, cushioning materials, packaging materials, and cigarette filters. The same applies to the second and third aspects of the present invention, which will be described later.

[0058] [Second embodiment: Molded article] A second embodiment of the first aspect of the present invention is a molded article formed from the resin composition of the present invention described above. Specific examples of molded articles are as described above for molded articles made from the resin composition of the present invention. Because the molded article of the present invention is formed from the resin composition of the present invention, it can be molded into a desired shape, has excellent impact resistance, and conforms to the concept of carbon neutrality. For these reasons, vehicle parts are preferred as the molded article of the present invention.

[0059] [Third Embodiment: Vehicle] A third embodiment of the first aspect of the present invention is a vehicle equipped with the molded article of the present invention described above. Specifically, in the vehicle of the present invention, the molded article of the present invention is used in interior parts such as bumpers, engine covers, suspensions, door panels, wheel covers, casings, airbag parts, fuel tank caps, cable parts, handlebars, shift levers, dashboards, and seats. The vehicle is not limited to four-wheeled automobiles, but may also be a two-wheeled vehicle, a three-wheeled vehicle, or other specialized vehicle. Because the vehicle of the present invention is equipped with the molded article of the present invention, it has excellent strength (impact resistance) and conforms to the concept of carbon neutrality.

[0060] [Fourth embodiment: method for producing a resin composition] A fourth embodiment of the first aspect of the present invention is a method for producing a resin composition, comprising a step of heat-kneading woody biomass roasted material (A) and a thermoplastic resin (B) at 180°C or higher and 230°C or lower, wherein the thermoplastic resin (B) contains a polypropylene-based resin (B1) and a copolymerized polyolefin resin (B2), and the mass ratio (B2 / (B1+B2)) of the copolymerized polyolefin resin (B2) to the total mass of the polypropylene-based resin (B1) and the copolymerized polyolefin resin (B2) is more than 0.00 and less than 0.80, with the proviso that the copolymerized polyolefin resin (B2) excludes the polypropylene-based resin (B1).

[0061] The types and contents of the components of the resin composition (woody biomass roasted material (A), thermoplastic resin (B), polypropylene resin (B1), copolymer polyolefin resin (B2), other resin (C), and optional component (D)) are the same as those explained in the resin composition of the first aspect of the present invention, and therefore will not be explained again.

[0062] In the method for producing a resin composition according to the first aspect of the present invention, the average particle size of each component used in the heat-kneading step when blended is not particularly limited, as long as it is an average particle size that corresponds to the average particle size in the resin composition in the final resin composition. However, from a production standpoint, it is preferable that the woody biomass roasted material (A) is pre-crushed to a size that can be introduced into the heat-kneading device described below when blended. When pre-crushed woody biomass roasted material (A) is used in the heat-kneading step, the average particle size of the pre-crushed material when blended may be, for example, 15 mm or less, or may be crushed even finer.

[0063] The heating and kneading may be carried out by a conventional method, for example, by appropriately combining a ribbon blender, a drum tumbler, a Henschel mixer, a Banbury mixer, a single-screw extruder, a twin-screw extruder, a co-kneader, a multi-screw extruder, or the like.

[0064] The method for producing a resin composition according to the first aspect of the present invention may include a first step of melt-kneading a raw material, woody biomass roasted material (A), and a portion of a thermoplastic resin (B) (hereinafter, sometimes referred to as a "binder") to produce a masterbatch, and a second step of dry-blending the masterbatch with the remainder of the thermoplastic resin (B). In the first step, for example, a portion of a polypropylene-based resin (B1) and the entire amount of a copolymerized polyolefin resin (B2) are melt-kneaded as a binder. In the second step, for example, the remainder of the polypropylene-based resin (B1) is added to the masterbatch and dry-blended. In this production method, when other resins (C) or optional components (D) are added, they may be added in either the first step or the second step. From the viewpoint of efficient and effective utilization of woody biomass, it is desirable to add a small amount of binder in the first step. Specifically, in the first step, the amount of binder used per 100 parts by mass of the woody biomass roasted material (A) is preferably 200 parts by mass or less, more preferably 120 parts by mass or less.

[0065] <Second Aspect> <First Embodiment: Resin Composition> A first embodiment of the second aspect of the present invention is a resin composition comprising woody biomass roasted material (A), a thermoplastic resin (B') having no acidic groups, and a polyhydroxycarboxylic acid (C1), wherein the content of the polyhydroxycarboxylic acid (C1) relative to 100% by mass of the resin composition is more than 0.0% by mass and less than 8.0% by mass, and the mass ratio (C1 / A) of the polyhydroxycarboxylic acid (C1) to the woody biomass roasted material (A) is more than 0.00 and less than 0.40.

[0066] Unless otherwise specified, each component and embodiment has the same meaning as described in the first aspect.

[0067] The woody biomass roasted product (A) is preferably a crushed product. The crushed woody biomass roasted product (A) can be obtained by crushing the woody biomass roasted product (A) when the woody biomass roasted product (A), the thermoplastic resin (B′), and the polyhydroxycarboxylic acid (C1) are heated and kneaded.

[0068] [Average particle size of crushed woody biomass roasted material (A)] The average particle size of crushed woody biomass roasted material (A) in the resin composition is the same as that in the first embodiment. Note that this average particle size is a value measured after heating and kneading the woody biomass roasted material (A), the thermoplastic resin (B′), and the polyhydroxycarboxylic acid (C1).

[0069] [Thermoplastic Resin (B')] The thermoplastic resin (B') in the present invention is not particularly limited, and any resin can be used as long as it can be plasticized by heat and can be molded, and does not have an acidic group. For example, polypropylene resins having a repeating unit derived from propylene, such as propylene homopolymers, propylene-ethylene block copolymers, propylene-1-butene block copolymers, propylene-ethylene-1-butene block copolymers, propylene-ethylene-1-butene random copolymers, propylene-ethylene-1-butene random copolymers, propylene-ethylene random block copolymers, propylene-ethylene-1-butene random block copolymers, propylene-hexene random copolymers, propylene-octene random copolymers, and ethylene-propylene-1-butene copolymers; polyethylenes such as low-density polyethylene, linear low-density polyethylene, very low-density polyethylene, and high-density polyethylene; ethylene copolymers such as ethylene copolymers; Examples of suitable thermoplastic resins include polyethylene-based resins having repeating units derived from ethylene, such as ethylene-1-butene copolymers, ethylene-hexene copolymers, ethylene-octene copolymers, ethylene-vinyl alcohol copolymers, and chlorinated polyethylene (excluding those corresponding to polypropylene-based resins, with ethylene-α-olefin copolymers being preferred), polyolefin resins such as polybutene, polyisobutylene, butyl rubber, halogenated butyl rubber, polymethylpentene, and cyclic olefin copolymers (excluding those corresponding to polypropylene-based resins or polyethylene-based resins), polyacetal resins such as polyoxymethylene, and thermoplastic elastomers such as styrene-based elastomers, polyolefin-based elastomers, polyester-based elastomers, and polyamide-based elastomers. Thermoplastic resin (B') can be used alone or in combination. From the viewpoint of ease of handling, it is preferred to contain at least a polypropylene-based resin, more preferably at least a propylene-ethylene block copolymer, and even more preferably a combination of a propylene-ethylene block copolymer and an ethylene-1-butene block copolymer. The thermoplastic resin (B') may be entirely or partially derived from plants.

[0070] The thermoplastic resin (B') may contain a thermoplastic elastomer. In the present invention, when the thermoplastic resin (B') contains a thermoplastic elastomer, it may be expected that a molding resin with high viscosity that does not break or crack during injection molding can be stably produced even when crushed woody biomass roasted material (A) is mixed therewith.

[0071] The thermoplastic elastomer may be a low-crystalline thermoplastic elastomer that does not have a clear yield point, or a non-crystalline thermoplastic elastomer that does not have a clear melting point or yield point and has rubber elasticity at room temperature. Examples of the thermoplastic elastomer include the styrene-based elastomer, polyolefin-based elastomer, polyester-based elastomer, and polyamide-based elastomer exemplified above.

[0072] Examples of styrene-based elastomers that can be used include butadiene-styrene copolymers (random copolymers, block copolymers, graft copolymers) and hydrogenated products thereof, styrene-butadiene-styrene copolymer (SBS), hydrogenated styrene-butadiene-styrene copolymer (SEBS), hydrogenated styrene-butadiene copolymer (HSBR), isoprene-styrene copolymers (random copolymers, block copolymers, graft copolymers) and hydrogenated products thereof, hydrogenated styrene-isoprene copolymer (SEPS), hydrogenated styrene-vinylisoprene copolymer (SIS), hydrogenated styrene-isoprene-styrene copolymer (SEPS), hydrogenated styrene-butadiene rubber (HSBR), and hydrogenated styrene-butadiene-olefin crystalline block copolymer (SEBC).

[0073] As the polyolefin elastomer, ethylene-propylene rubber (EPR), ethylene-butene-1 elastomer (EBM), etc. can be used.

[0074] As the polyester-based elastomer, a polyester-polyether copolymer, a polyester-polyester copolymer, etc. can be used.

[0075] As the polyamide-based elastomer, polyamide-polyester copolymer, polyamide-polyether copolymer, etc. can be used.

[0076] As the thermoplastic elastomer, polyolefin elastomers such as ethylene-propylene rubber (EPR) and ethylene-butene-1 elastomer (EBM) are preferred because they have high compatibility with the thermoplastic resin (B'). The thermoplastic elastomer may be a plant-derived elastomer or a biodegradable elastomer. By including a plant-derived elastomer in the resin composition of the second aspect of the present invention, it is possible to reduce components derived from petroleum resources.

[0077] [Polyhydroxycarboxylic Acid (C1)] Polyhydroxycarboxylic acid (C1) includes homopolymers of hydroxycarboxylic acids, copolymers of hydroxycarboxylic acids, and ring-opening polymers or copolymers of cyclic esters such as lactones. Examples of hydroxycarboxylic acids include aliphatic hydroxycarboxylic acids having 2 to 6 carbon atoms, such as lactic acid, glycolic acid, hydroxybutyric acid, hydroxyvaleric acid, and hydroxycaproic acid. Examples of cyclic esters include lactones such as α-acetolactone, β-propiolactone, γ-butyrolactone, δ-valerolactone, γ-valerolactone, and ε-caprolactone. Preferred monomers for polyhydroxycarboxylic acid (C1) are lactic acid, glycolic acid, 3-hydroxybutyric acid, 3-hydroxyvaleric acid, 4-hydroxybutyric acid, and ε-caprolactone, with lactic acid being more preferred. These monomers can be used alone or in a mixture of two or more types in the polymerization of polyhydroxycarboxylic acid (C1). The optical isomer structure of the hydroxycarboxylic acid may be either the D-isomer or the L-isomer alone, or a mixture of the D-isomer and the L-isomer in any ratio.

[0078] Examples of the polyhydroxycarboxylic acid (C1) include aliphatic hydroxycarboxylic acid homopolymers such as polylactic acid (PLA), polyglycolic acid, and poly-3-hydroxybutyric acid; copolymers of 3-hydroxybutyric acid with other hydroxycarboxylic acids such as poly-3-hydroxybutyric acid-co-3-hydroxyvaleric acid (PHBV), poly-3-hydroxybutyric acid-co-4-hydroxybutyric acid, and poly-3-hydroxybutyric acid-co-3-hydroxyhexanoic acid (PHBH); and ring-opening polymers of lactones such as polybutyrolactone, polyvalerolactone, and polycaprolactone. From the viewpoints of improving moldability and increasing impact resistance, the polyhydroxycarboxylic acid (C1) is preferably an aliphatic hydroxycarboxylic acid homopolymer or a ring-opening polymer of a cyclic ester, more preferably a hydroxyalkanoic acid homopolymer or a ring-opening polymer of a lactone, even more preferably a polymer of a hydroxyalkanoic acid having 2 to 6 carbon atoms or a ring-opening polymer of ε-caprolactone, particularly preferably polylactic acid, polyglycolic acid, polycaprolactone, or polyhydroxybutyric acid, even more particularly preferably polylactic acid, polyglycolic acid, polycaprolactone, poly-3-hydroxybutyric acid, or poly-4-hydroxybutyric acid, even more particularly preferably polylactic acid or polycaprolactone, and most preferably polylactic acid. The polyhydroxycarboxylic acid (C1) may be one of the above-mentioned compounds or a mixture of two or more of them.

[0079] The polyhydroxycarboxylic acid (C1) has hydroxyl groups and carboxyl groups, and is thought to interact with the surface of the woody biomass roasted material (A) via hydrogen bonds, etc. The woody biomass roasted material (A) having polar groups on its surface is generally difficult to disperse in the thermoplastic resin (B'), which is a component with relatively low polarity. However, in the resin composition of the second aspect of the present invention, the presence of a certain amount of polyhydroxycarboxylic acid (C1) makes it easy to disperse the woody biomass roasted material (A) in the thermoplastic resin (B'), which is thought to result in good moldability and impact resistance.

[0080] The polyhydroxycarboxylic acid (C1) may be a plant-derived polymer or a biodegradable polymer, and the use of such a polyhydroxycarboxylic acid (C1) can provide an environmentally friendly material. Furthermore, the presence of a plant-derived polymer in the resin composition of the second aspect of the present invention can reduce the content of components derived from petroleum resources. These polyhydroxycarboxylic acids (C1) can be used alone, or two or more types can be used as desired. [Optional Component (D)] The resin composition of the second aspect of the present invention can optionally contain a compatibilizing resin, a reinforcing material, a non-plant-based filler, a heat stabilizer, an antioxidant, a weathering agent, an anti-degradant such as a light stabilizer, a flow improver, a mold release agent, or a lubricant in order to improve the functionality and properties of the molded article obtained therefrom.

[0081] The compatibilizing resin is a resin that does not fall under the category of thermoplastic resin (B') or polyhydroxycarboxylic acid (C1), and serves to enhance uniform mixing and adhesion between the woody biomass roasted material (A) and the thermoplastic resin (B'). Known compatibilizing resins can be used, including, but not limited to, compounds in which polar groups such as acidic groups have been introduced into polyolefins such as maleic anhydride-modified polypropylene or polyester polymers or copolymers. Commercially available products include acid-modified polyolefins such as "UMEX (registered trademark) 1010 (manufactured by Sanyo Chemical Industries)" and "MODIC (registered trademark) P908 (manufactured by Mitsubishi Chemical Corporation)." Furthermore, the compatibilizing resin can be a compound in which polar groups such as acidic groups have been introduced into a thermoplastic elastomer, such as "TUFTECH (registered trademark) M1943 (manufactured by Asahi Kasei Corporation)," a maleic anhydride-modified styrene-butadiene block copolymer.

[0082] The compatibilizing resin may be an ionomer resin. The ionomer resin is not particularly limited, and examples thereof include ethylene-methacrylic acid copolymer ionomer, ethylene-acrylic acid copolymer ionomer, propylene-methacrylic acid copolymer ionomer, propylene-acrylic acid copolymer ionomer, butylene-acrylic acid copolymer ionomer, ethylene-vinyl sulfonic acid copolymer ionomer, styrene-methacrylic acid copolymer ionomer, sulfonated polystyrene ionomer, fluorine-based ionomer, telechelic polybutadiene acrylic acid ionomer, sulfonated ethylene ionomer, propylene-meth ... Examples of the ionomer include styrene-propylene-diene copolymer ionomers, hydrogenated polypentamer ionomers, polypentamer ionomers, poly(vinylpyridium salt) ionomers, poly(vinyltrimethylammonium salt) ionomers, poly(vinylbenzylphosphonium salt) ionomers, styrene-butadiene acrylic acid copolymer ionomers, polyurethane ionomers, sulfonated styrene-2-acrylamide-2-methylpropane sulfate ionomers, acid-amine ionomers, aliphatic ionenes, and aromatic ionenes. Commercially available products of these include "Himilan (registered trademark) 1554", "Himilan (registered trademark) 1555", "Himilan (registered trademark) 1557", "Himilan (registered trademark) 1601", "Himilan (registered trademark) 1605", "Himilan (registered trademark) 1650", "Himilan (registered trademark) 1652", "Himilan (registered trademark) 1652 SR", "Himilan (registered trademark) 1652 SB", "Himilan (registered trademark) 1702", "Himilan (registered trademark) 1705", "Himilan (registered trademark) 1706", "Himilan (registered trademark) 1707", "Himilan (registered trademark) 1855", and "Himilan (registered trademark) 1856" (manufactured by DuPont-Mitsui Polychemicals Co., Ltd.).

[0083] [Method for producing resin composition] The content of woody biomass roasted product (A) is preferably 5 to 60 mass%, more preferably 10 to 50 mass%, and even more preferably 15 to 35 mass%, relative to 100 mass% of the resin composition, from the viewpoints of suppressing the content of synthetic resins derived from petroleum resources and of moldability. The content of thermoplastic resin (B') is preferably 35 to 94 mass%, more preferably 48 to 88 mass%, even more preferably 60 to 82 mass%, and even more preferably 70 to 81 mass%, relative to 100 mass% of the resin composition.

[0084] The content of the polyhydroxycarboxylic acid (C1) is, relative to 100% by mass of the resin composition, more than 0.0% by mass and less than 8.0% by mass, preferably more than 0.0% by mass and 6.0% by mass or less, more preferably more than 0.0% by mass and less than 4.5% by mass, and even more preferably more than 0.0% by mass and less than 3.0% by mass, from the viewpoints of moldability and impact resistance.

[0085] The mass ratio (C1 / A) of the polyhydroxycarboxylic acid (C1) to the woody biomass roasted material (A) is, from the viewpoints of moldability and impact resistance, more than 0.00 and less than 0.40, preferably more than 0.00 and 0.30 or less, and more preferably 0.01 or more and 0.25 or less.

[0086] The second embodiment: molded article and the third embodiment: vehicle in the second aspect of the present invention are the same as those in the first aspect.

[0087] [Fourth embodiment: method for producing resin composition] A fourth embodiment of the second aspect of the present invention is a method for producing a resin composition, comprising a step of heat-kneading a woody biomass roasted product (A), a thermoplastic resin (B') having no acidic groups, and a polyhydroxycarboxylic acid (C1) at 190°C or higher and 230°C or lower, wherein the content of the polyhydroxycarboxylic acid (C1) relative to 100% by mass of the resin composition is more than 0.0% by mass and less than 8.0% by mass, and the mass ratio (C1 / A) of the polyhydroxycarboxylic acid (C1) to the woody biomass roasted product (A) is more than 0.00 and less than 0.40.

[0088] The types and contents of each component of the resin composition (woody biomass roasted material (A), thermoplastic resin (B'), polyhydroxycarboxylic acid (C1), optional component (D)) are the same as those described above in the resin composition of the present invention, and therefore will not be described again.

[0089] The method for producing a resin composition of the present invention may include a first step of melt-kneading the raw material woody biomass roasted product (A), a portion of the thermoplastic resin (B') (hereinafter, sometimes referred to as "binder"), and polyhydroxycarboxylic acid (C1) to produce a masterbatch, and a second step of dry-blending the masterbatch with the remainder of the thermoplastic resin (B'). In this production method, when the optional component (D) is added, it may be added in either the first step or the second step. From the viewpoint of efficient and effective utilization of woody biomass, it is desirable to use a small amount of binder in the first step. Specifically, the amount of binder used in the first step per 100 parts by mass of the woody biomass roasted product (A) is preferably 200 parts by mass or less, more preferably 120 parts by mass or less.

[0090] <Third Aspect> <First Embodiment: Resin Composition> A first embodiment of the third aspect of the present invention is a resin composition comprising woody biomass roasted material (A), a thermoplastic resin (B') having no acidic groups, and an acid-modified polyolefin resin (C2), wherein the content of the acid-modified polyolefin resin (C2) relative to 100 mass% of the resin composition is more than 0.00 mass% and less than 1.00 mass%, and the mass ratio (C2 / A) of the acid-modified polyolefin resin (C2) to the woody biomass roasted material (A) is more than 0.0000 and less than 0.1000.

[0091] Unless otherwise specified, each component and embodiment has the same meaning as described in the first and second aspects.

[0092] The resin composition of the present invention includes a resin composition containing a woody biomass roasted material (A), a thermoplastic resin (B'), and an acid-modified polyolefin resin (C2).

[0093] The resin composition of the present invention has a Charpy impact strength of 4.5 kJ / m as measured in accordance with JIS K6921-2:2018. ２ It is preferable that the concentration is 4.5 kJ / m or more. ２ More preferably, more than 4.6 kJ / m ２ In this specification, the specific method for measuring the Charpy impact strength can be determined by referring to the method described in the Examples or a similar method.

[0094] The woody biomass roasted product (A) is preferably a crushed product. Crushed woody biomass roasted product (A) can be obtained, for example, by crushing the woody biomass roasted product (A) when the woody biomass roasted product (A), the thermoplastic resin (B), and the acid-modified polyolefin resin (C2) are heated and kneaded together. The crushed product referred to here means that the woody biomass roasted product (A) has been crushed from a pellet- or briquette-shaped compact before heating and kneading, and the shape of the crushed product is not particularly limited and may be irregular. From the viewpoint of shortening the production process, it is preferable to simultaneously crush the woody biomass roasted product (A) while heating and kneading the woody biomass roasted product (A), the thermoplastic resin (B'), and the acid-modified polyolefin resin (C2). On the other hand, from the viewpoint of smoothly feeding the woody biomass roasted material (A) to an optional extruder described below, the woody biomass roasted material (A) may be pre-pulverized as appropriate before feeding to form pre-crushed material, which may then be fed into the extruder. The shape of the pre-crushed material is not particularly limited, and the size thereof may be set to a size that allows it to be fed into an optional extruder described below. The average particle size of the pre-crushed material may be, for example, 15 mm or less, or it may be crushed even finer.

[0095] [Average particle size of crushed woody biomass roasted material (A)] The average particle size of crushed woody biomass roasted material (A) in the resin composition is the same as that described above. Note that this average particle size is the value after heating and kneading the woody biomass roasted material (A), the thermoplastic resin (B′), and the acid-modified polyolefin resin (C2).

[0096] (Thermoplastic resin (B')) in the third embodiment is the same as that in the second embodiment. However, in the third embodiment, the description of "a polyolefin resin such as a copolymer of a cyclic olefin (excluding those corresponding to a polypropylene-based resin or a polyethylene-based resin)" in the description of the thermoplastic resin (B') in the second embodiment is to be read as "a polyolefin resin such as a copolymer of a cyclic olefin (excluding those corresponding to a polypropylene-based resin)."

[0097] [Acid-Modified Polyolefin Resin (C2)] The acid-modified polyolefin resin (C2) is, for example, a polyolefin resin modified (an acidic group is introduced) with at least one acidic group or a derivative thereof (such as an acid anhydride or an acid ester group). Examples of the acid-modified polyolefin resin (C2) include copolymers (random copolymers, block copolymers) made from a monomer containing an olefinic monomer and an acidic group-containing monomer, and copolymers (graft copolymers) made from an olefinic monomer and grafted with an acidic group-containing compound. Examples of the olefinic monomer include α-olefin monomers having 2 to 6 carbon atoms, such as ethylene, propylene, butene, pentene, and hexene, and cyclic olefin monomers, such as cyclopentene and cyclohexene. Examples of acidic group-containing monomers include unsaturated carboxylic acids such as acrylic acid, methacrylic acid, maleic acid, fumaric acid, tetrahydrophthalic acid, itaconic acid, mesaconic acid, citraconic acid, crotonic acid, isocrotonic acid, and endo-cis-bicyclo[2,2,1]hept-5-ene-2,3-dicarboxylic acid, and unsaturated carboxylic acid derivatives such as methyl acrylate, ethyl acrylate, methyl methacrylate, ethyl methacrylate, vinyl acetate, malenyl chloride, maleimide, maleic anhydride, citraconic anhydride, monomethyl maleate, dimethyl maleate, and glycidyl maleate. Examples of acidic group-containing compounds include maleic anhydride, itaconic anhydride, and citraconic anhydride.

[0098] Specific examples of the acid-modified polyolefin resin (C2) include maleic anhydride-modified polyethylene resins such as maleic anhydride-modified polyethylene, maleic anhydride-modified polypropylene homopolymers, maleic anhydride-modified polypropylene copolymers, and other maleic anhydride-modified polypropylene resins, and ethylene-(meth)acrylic acid copolymers (particularly ethylene-(meth)acrylic acid graft copolymers). These acid-modified polyolefin resins (C2) can be used alone or in combination of two or more. Commercially available products include acid-modified polyolefins such as "UMEX (registered trademark) 1010 (manufactured by Sanyo Chemical Industries)" and "MODIC (registered trademark) P908 (manufactured by Mitsubishi Chemical Corporation)." The acid-modified polyolefin resin (C2) may be entirely or partially derived from plants.

[0099] The acid-modified polyolefin resin (C2) may be an acid-modified thermoplastic elastomer, and is not particularly limited thereto. Examples of the acid-modified styrene-based elastomer include, but are not limited to, acid-modified styrene-ethylene-butylene-styrene copolymer, maleic anhydride-modified styrene-ethylene-propylene-styrene copolymer, maleic anhydride-modified styrene-butadiene-styrene copolymer, and maleic anhydride-modified styrene-isoprene-styrene copolymer. Examples of commercially available products of these include "Tuftec (registered trademark) M1943 (manufactured by Asahi Kasei Corporation)," which is a maleic anhydride-modified styrene-butadiene block copolymer.

[0100] The acid-modified polyolefin resin (C2) preferably contains at least one selected from the group consisting of maleic anhydride-modified polyethylene resins, maleic anhydride-modified polypropylene homopolymers, maleic anhydride-modified polypropylene copolymers, and ethylene-(meth)acrylic acid copolymers.

[0101] The acid-modified polyolefin resin (C2) is thought to have the property of easily bonding to or interacting with the surface of the woody biomass roasted material (A) due to the presence of acidic groups. Woody biomass roasted material (A) having polar groups on its surface is generally difficult to disperse in the thermoplastic resin (B'), which is a component with relatively low polarity. However, in the resin composition of the present invention, the presence of a certain amount of acid-modified polyolefin resin (C2) makes it easy for the woody biomass roasted material (A) to disperse in the thermoplastic resin (B'), which is thought to result in good moldability and impact resistance.

[0102] The acid value of the acid-modified polyolefin resin (C2) measured in accordance with JIS K-0070:1992 is preferably 10 mgKOH / g or more and 100 mgKOH / g or less, more preferably 40 mgKOH / g or more and 60 mgKOH / g or less.

[0103] From the viewpoint of moldability, the acid-modified polyolefin resin (C2) preferably has a melting point measured by differential scanning calorimetry (hereinafter, sometimes referred to as DSC) of 50 to 200°C, more preferably 80 to 180°C, and even more preferably 100 to 170°C.

[0104] From the viewpoint of moldability, the acid-modified polyolefin resin (C2) preferably has a lower limit of polystyrene-equivalent weight average molecular weight (Mw) measured by size exclusion liquid chromatography of 5,000 or more, more preferably 10,000 or more, and the acid-modified polyolefin resin (C2) preferably has an upper limit of Mw of 500,000 or less, more preferably 300,000 or less.

[0105] From the viewpoint of moldability, the acid-modified polyolefin resin (C2) preferably has a lower limit of viscosity when melted of 100 mPa s or more, more preferably 3,000 mPa s or more. The acid-modified polyolefin resin (C2) preferably has an upper limit of viscosity when melted of 50,000 mPa s or less, more preferably 20,000 mPa s or less. The viscosity is measured at a temperature of melting point +20°C to 25°C (preferably +22°C).

[0106] [Other Resins (D1)] The resin composition of the present invention may contain a resin component (other resin (D1)) that does not fall under the category of thermoplastic resin (B') or acid-modified polyolefin resin (C2). Any resin that can be plasticized and molded by heat can be used as the other resin (D1), and it may be a plant-derived resin or a biodegradable resin, and the use of these resins can provide an environmentally friendly material. Furthermore, the presence of other plant-derived resins (D1) in the resin composition of the present invention can reduce components derived from petroleum resources.

[0107] Examples of other resins (D1) that fall under the category of biodegradable resins having thermoplasticity include, but are not limited to, polylactic acid (PLA), polyhydroxyalkanoates (PHAs), polybutylene succinate, polyethylene succinate, polyglycol, polycaprolactone, polyvinyl alcohol, etc. These biodegradable resins can be used alone, or two or more types can be used if desired.

[0108] [Method for producing resin composition] The resin composition contains a woody biomass roasted material (A), a thermoplastic resin (B'), and an acid-modified polyolefin resin (C2). The resin composition can be obtained by blending and mixing or kneading the above-mentioned components.

[0109] The content of the acid-modified polyolefin resin (C2) is more than 0.00% by mass and less than 1.00% by mass, preferably more than 0.00% by mass and less than 0.10% by mass, and more preferably more than 0.00% by mass and 0.08% by mass or less, relative to 100% by mass of the resin composition.

[0110] The mass ratio (C2 / A) of the acid-modified polyolefin resin (C2) to the woody biomass roasted material (A) is more than 0.0000 and less than 0.1000, preferably more than 0.0000 and less than 0.0100, more preferably more than 0.0000 and less than 0.0050, and even more preferably 0.0005 or more and 0.0045 or less.

[0111] The [Second embodiment: molded article] and [Third embodiment: vehicle] in the third aspect of the present invention are the same as those in the first and second aspects.

[0112] [Fourth embodiment: method for producing resin composition] A fourth embodiment of the third aspect of the present invention is a method for producing a resin composition, comprising a step of heat-kneading a woody biomass roasted product (A), a thermoplastic resin (B') having no acidic groups, and an acid-modified polyolefin resin (C2) at 190°C or higher and 230°C or lower, wherein the content of the acid-modified polyolefin resin (C2) relative to 100% by mass of the resin composition is more than 0.0% by mass and less than 8.0% by mass, and the mass ratio (C2 / A) of the acid-modified polyolefin resin (C2) to the woody biomass roasted product (A) is more than 0.00 and less than 0.40.

[0113] The types and contents of each component of the resin composition (woody biomass roasted material (A), thermoplastic resin (B'), acid-modified polyolefin resin (C2), other resin (D1), optional component (E)) are the same as those described above in the resin composition of the present invention, and therefore will not be described again.

[0114] The method for producing a resin composition of the present invention may include a first step of melt-kneading the raw material woody biomass roasted product (A), a portion of the thermoplastic resin (B') (hereinafter, sometimes referred to as "binder"), and the acid-modified polyolefin resin (C2) to produce a masterbatch, and a second step of dry-blending the masterbatch with the remainder of the thermoplastic resin (B'). In this production method, when other resins or optional components (E) are added, they may be added in either the first step or the second step. From the viewpoint of efficient and effective utilization of woody biomass, it is desirable to use a small amount of binder in the first step. Specifically, the amount of binder used in the first step is preferably 200 parts by mass or less, more preferably 120 parts by mass or less, per 100 parts by mass of the woody biomass roasted product (A).

[0115] Next, the first embodiment of the present invention will be described in detail with reference to examples, but the scope of the present invention is not limited to these examples.

[0116] <Woody Biomass Roasted Product (A)> The following components were used for the woody biomass roasted product. Torrefied pellets: "MUCC Torrefied Pellets (registered trademark)" manufactured by UBE Mitsubishi Cement Corporation

[0117] <Polypropylene-based resin (B1)> The following components were used as the polypropylene-based resin: Polypropylene resin "BC03B": manufactured by Japan Polypropylene Corporation, MFR (230°C / 2.16 kg) 30 g / 10 min

[0118] <Copolymer Polyolefin Resin (B2)> The copolymer polyolefin resin used had the following components: Ethylene-α-olefin copolymer "DF7350": ethylene / 1-butene copolymer ("Tafmer (registered trademark) DF7350" manufactured by Mitsui Chemicals, Inc.), MFR (230°C / 2.16 kg) 35 g / 10 min

[0119] <Other Resins (C)> The following components were used as the other resins (C). Polylactic acid "FY601": "Polylactic acid FY601" manufactured by ANHUI BBCA BIOCHEMICAL & FUTERRO PLA CO., LTD., D-isomer content 0 to 1.0 mol%, MFR (190°C / 2.16 kg) 7 to 12 g / 10 min, melting point 170 to 180°C. Acid-modified polyolefin "UMEX (registered trademark) 1010": "UMEX (registered trademark) 1010" manufactured by Sanyo Chemical Industries, Ltd., acid value 52 mg KOH / g (in accordance with JIS K-0070:1992), molecular weight 30,000, viscosity 6,000 mPa s (160°C).

[0120] <Mixing Conditions> Mixing in the examples and comparative examples was carried out using a test mixer / extruder ("Labo Plastomill (registered trademark) KF-70" manufactured by Toyo Seiki Co., Ltd.) under the following conditions: barrel temperature 200°C, rotation speed 50 rpm, and mixing time 1 minute.

[0121] <Injection Molding Conditions> Injection molding in the examples and comparative examples was carried out using a small injection molding machine ("Micro-3" manufactured by Meiho Co., Ltd.) in accordance with JIS K6921-2:2018 under the following conditions: cylinder temperature 200°C, mold temperature 40°C

[0122] <Notching Conditions> Notching in the examples and comparative examples was performed using a "Notching Tool (registered trademark)" manufactured by Toyo Seiki Co., Ltd. under the following conditions: Shape: one-sided V-notch, notch depth: 1 mm

[0123] <Charpy Impact Test> The Charpy impact test in the examples and comparative examples was carried out in accordance with JIS K6921-2:2018 using a Charpy / Izod impact tester No. 258-D manufactured by Yasuda Seiki Co., Ltd. under the following conditions: Hammer: 0.5 J, swing position: 150°

[0124] (Measurement of average particle size) The average particle size of the pre-crushed woody biomass roasted material before mixing was measured using a vernier caliper to obtain an average value. The average particle size of the crushed woody biomass roasted material in the resin composition was measured after dissolution and separation using a laser diffraction particle size analyzer (LA-9500V2, Horiba, Ltd.), and the 50% particle size on a volume basis was taken as the average particle size.

[0125] [Examples and Comparative Examples] (Production Examples) Roasted woody biomass was pre-crushed using a mixer mill, and the resulting pre-crushed material having an average particle size of 15 mm or less was used in the examples and comparative examples.

[0126] (Example A1) The pre-crushed woody biomass roasted material (50 parts by mass) obtained in the Production Example, polypropylene resin "BC03B" (40 parts by mass), and ethylene-α-olefin copolymer "DF7350" (10 parts by mass) were melt-kneaded at 200 ° C. to obtain a mixture. The obtained mixture (40 parts by mass) was dry-blended with polypropylene resin "BC03B" (60 parts by mass) to obtain a resin composition (A / B1 / B2 = 20 / 76 / 4 (mass ratio)). The average particle size of the crushed woody biomass roasted material in the resin composition was 50 μm. The obtained resin composition was then injection-molded using a small injection molding machine to obtain a molded product with a length of 80 mm, a width of 5 mm, and a thickness of 2 mm.

[0127] (Example A2) The pre-crushed woody biomass roasted material (50 parts by mass) obtained in the Production Example, polypropylene resin "BC03B" (30 parts by mass), and ethylene-α-olefin copolymer "DF7350" (20 parts by mass) were melt-kneaded at 200 ° C. to obtain a mixture. The obtained mixture (40 parts by mass) and polypropylene resin "BC03B" (60 parts by mass) were dry-blended to obtain a resin composition (A / B1 / B2 = 20 / 72 / 8 (mass ratio)). The average particle size of the crushed woody biomass roasted material in the resin composition was 50 μm. Next, the obtained resin composition was injection-molded using a small injection molding machine to obtain a molded product with a length of 80 mm, a width of 5 mm, and a thickness of 2 mm.

[0128] (Example A3) The pre-crushed woody biomass roasted material (50 parts by mass) obtained in the Production Example, polypropylene resin "BC03B" (20 parts by mass), and ethylene-α-olefin copolymer "DF7350" (30 parts by mass) were melt-kneaded at 200 ° C. to obtain a mixture. The obtained mixture (40 parts by mass) was dry-blended with polypropylene resin "BC03B" (60 parts by mass) to obtain a resin composition (A / B1 / B2 = 20 / 68 / 12 (mass ratio)). The average particle size of the crushed woody biomass roasted material in the resin composition was 50 μm. The obtained resin composition was then injection-molded using a small injection molding machine to obtain a molded product with a length of 80 mm, a width of 5 mm, and a thickness of 2 mm.

[0129] (Example A4) The pre-crushed woody biomass roasted material (50 parts by mass) obtained in the Production Example was melt-kneaded with polypropylene resin "BC03B" (30 parts by mass), ethylene-α-olefin copolymer "DF7350" (10 parts by mass), and polylactic acid "FY601" (10 parts by mass) at 200 ° C. to obtain a mixture. The obtained mixture (40 parts by mass) was dry-blended with polypropylene resin "BC03B" (60 parts by mass) to obtain a resin composition (A / B1 / B2 / C = 20 / 72 / 4 / 4 (mass ratio)). The average particle size of the crushed woody biomass roasted material in the resin composition was 50 μm. The obtained resin composition was then injection-molded using a small injection molding machine to obtain a molded product with a length of 80 mm, a width of 5 mm, and a thickness of 2 mm.

[0130] (Example A5) The pre-crushed woody biomass roasted material (50 parts by mass) obtained in the Production Example was melt-kneaded with polypropylene resin "BC03B" (19.95 parts by mass), ethylene-α-olefin copolymer "DF7350" (30 parts by mass), and acid-modified polyolefin "UMEX (registered trademark) 1010" (0.05 parts by mass) at 200 ° C. to obtain a mixture. The obtained mixture (40 parts by mass) was dry-blended with polypropylene resin "BC03B" (60 parts by mass) to obtain a resin composition (A / B1 / B2 / C = 20 / 67.98 / 12 / 0.02 (mass ratio)). The average particle size of the crushed woody biomass roasted material in the resin composition was 50 μm. The obtained resin composition was then injection-molded using a small injection molding machine to obtain a molded product with a length of 80 mm, a width of 5 mm, and a thickness of 2 mm.

[0131] (Example A6) The pre-crushed woody biomass roasted material (50 parts by mass) obtained in the Production Example was melt-kneaded with polypropylene resin "BC03B" (19.8 parts by mass), ethylene-α-olefin copolymer "DF7350" (30 parts by mass), and acid-modified polyolefin "UMEX (registered trademark) 1010" (0.2 parts by mass) at 200 ° C. to obtain a mixture. The obtained mixture (40 parts by mass) was dry-blended with polypropylene resin "BC03B" (60 parts by mass) to obtain a resin composition (A / B1 / B2 / C = 20 / 67.92 / 12 / 0.08 (mass ratio)). The average particle size of the crushed woody biomass roasted material in the resin composition was 50 μm. The obtained resin composition was then injection-molded using a small injection molding machine to obtain a molded product with a length of 80 mm, a width of 5 mm, and a thickness of 2 mm.

[0132] (Example A7) The pre-crushed woody biomass roasted material (50 parts by mass) obtained in the Production Example, polypropylene resin "BC03B" (20 parts by mass), and ethylene-α-olefin copolymer "DF7350" (30 parts by mass) were melt-kneaded at 200 ° C. to obtain a resin composition (A / B1 / B2 = 50 / 20 / 30 (mass ratio)). The average particle size of the crushed woody biomass roasted material in the resin composition was 50 μm. Next, injection molding of the obtained resin composition was attempted using a small injection molding machine, but a molded product conforming to JIS K6921-2:2018 could not be obtained.

[0133] (Comparative Example a1) The pre-crushed woody biomass roasted material obtained in the Production Example (50 parts by mass) and polypropylene resin "BC03B" (50 parts by mass) were melt-kneaded at 200°C to obtain a mixture. The obtained mixture (40 parts by mass) and polypropylene resin "BC03B" (60 parts by mass) were dry-blended to obtain a resin composition (A / B1 = 20 / 80 (mass ratio)). The average particle size of the crushed woody biomass roasted material in the resin composition was 50 μm. The obtained resin composition was then injection-molded using a small injection molding machine to obtain a molded product with a length of 80 mm, a width of 5 mm, and a thickness of 2 mm.

[0134] (Comparative Example a2) The pre-crushed woody biomass roasted material obtained in the Production Example (50 parts by mass) and the ethylene-α-olefin copolymer "DF7350" (50 parts by mass) were melt-kneaded at 200 ° C. to obtain a mixture. The obtained mixture (40 parts by mass) was dry-blended with polypropylene resin "BC03B" (60 parts by mass) to obtain a resin composition (A / B1 / B2 = 20 / 60 / 20 (mass ratio)). The average particle size of the crushed woody biomass roasted material in the resin composition was 50 μm. Next, injection molding of the obtained resin composition was attempted using a small injection molding machine, but a molded product conforming to JIS K6921-2:2018 could not be obtained.

[0135] (Comparative Example a3) The pre-crushed woody biomass roasted material obtained in the Production Example (50 parts by mass), polypropylene resin "BC03B" (49 parts by mass), and acid-modified polyolefin "UMEX (registered trademark) 1010" (1 part by mass) were melt-kneaded at 200 ° C. to obtain a mixture. The obtained mixture (40 parts by mass) and polypropylene resin "BC03B" (60 parts by mass) were dry-blended to obtain a resin composition (A / B1 / C = 20 / 79.6 / 0.4 (mass ratio)). The average particle size of the crushed woody biomass roasted material in the resin composition was 50 μm. The obtained resin composition was then injection-molded using a small injection molding machine to obtain a molded product with a length of 80 mm, a width of 5 mm, and a thickness of 2 mm.

[0136] (Comparative Example a4) The pre-crushed woody biomass roasted material obtained in the Production Example (50 parts by mass) and the ethylene-α-olefin copolymer "DF7350" (50 parts by mass) were melt-kneaded at 200°C to obtain a resin composition (A / B2 = 50 / 50 (mass ratio)). The average particle size of the crushed woody biomass roasted material in the resin composition was 50 μm. Next, injection molding of the obtained resin composition was attempted using a small injection molding machine, but a molded product conforming to JIS K6921-2:2018 could not be obtained.

[0137] (Comparative Example a5) The pre-crushed woody biomass roasted material obtained in the Production Example (50 parts by mass), polypropylene resin "BC03B" (10 parts by mass), and ethylene-α-olefin copolymer "DF7350" (40 parts by mass) were melt-kneaded at 200 ° C. to obtain a resin composition (A / B1 / B2 = 50 / 10 / 40 (mass ratio)). The average particle size of the crushed woody biomass roasted material in the resin composition was 50 μm. Next, injection molding of the obtained resin composition was attempted using a small injection molding machine, but a molded product conforming to JIS K6921-2:2018 could not be obtained.

[0138] The compositions of the examples and comparative examples were measured and evaluated by the following methods.

[0139] (Charpy Impact Test) A V-notch was made in the molded article, and a Charpy impact test was carried out using a Charpy impact tester to measure the Charpy impact strength.

[0140]

[0141] Table 1 reveals the following. Comparing the examples and comparative examples, it was found that by incorporating crushed woody biomass roasted material (A), polypropylene resin (B1), and copolymer polyolefin resin (B2) such that the mass ratio (B2 / (B1+B2)) of the copolymer polyolefin resin (B2) relative to the total mass of the polypropylene resin (B1) and the copolymer polyolefin resin (B2) is greater than 0.00 and less than 0.80, and the mass ratio (B2 / A) of the copolymer polyolefin resin (B2) relative to the woody biomass roasted material (A) is greater than 0.00 and less than 1.00, a resin composition with excellent moldability and Charpy impact strength and reduced dependence on petroleum resources can be obtained. Furthermore, it was found that, as in Examples A4 to A6, a resin composition with excellent Charpy impact strength can be obtained even when other resins (C), such as polylactic acid or acid-modified polyolefin, are added.

[0142] Next, the second aspect of the present invention will be described in detail with reference to other examples, but the scope of the present invention is not limited to these examples.

[0143] <Woody Biomass Roasted Material (A)> The following components were used for the woody biomass roasted material (A). Torrefied pellets: "MUCC Torrefied Pellets (registered trademark)" manufactured by UBE Mitsubishi Cement Corporation

[0144] <Thermoplastic Resin (B')> The following components were used as the thermoplastic resin (B'): Polypropylene resin "BC03B" manufactured by Japan Polypropylene Corporation, MFR (230°C / 2.16 kg) 30 g / 10 min Ethylene / 1-butene copolymer ("DF7350"): "Tafmer (registered trademark) DF7350" manufactured by Mitsui Chemicals, Inc., MFR (230°C / 2.16 kg) 35 g / 10 min

[0145] <Polyhydroxycarboxylic acid (C1)> The following components were used as polyhydroxycarboxylic acid (C1): Polylactic acid "FY601" manufactured by ANHUI BBCA BIOCHEMICAL & FUTERRO PLA CO., LTD., D-isomer content 0 to 1.0 mol%, MFR (190°C / 2.16 kg) 7 to 12 g / 10 min, melting point 170 to 180°C

[0146] <Compatibilizing Resin> The following compatibilizing resin (optional component (D1)) was used: Acid-modified polyolefin "UMEX (registered trademark) 1010": "UMEX (registered trademark) 1010" manufactured by Sanyo Chemical Industries, Ltd., acid value 52 mg KOH / g (based on JIS K-0070:1992), molecular weight 30,000, viscosity 6,000 mPa·s (160°C) Hydrogenated styrene-based thermoplastic elastomer "TUFTECH (registered trademark) M1943": maleic anhydride-modified styrene-butadiene block copolymer "TUFTECH (registered trademark) M1943" manufactured by Asahi Kasei Corporation, styrene content 20%

[0147] The kneading conditions, injection molding conditions, notching conditions, Charpy impact test, and measurement of average particle size were the same as in the example of the first embodiment.

[0148] [Examples and Comparative Examples] (Production Examples) Roasted woody biomass was pre-crushed using a mixer mill, and the resulting pre-crushed material having an average particle size of 15 mm or less was used in the examples and comparative examples.

[0149] (Example B1) The pre-crushed woody biomass roasted material (50 parts by mass) obtained in the Production Example, polypropylene resin "BC03B" (49 parts by mass), and polylactic acid "FY601" (1 part by mass) were melt-kneaded at 200°C to obtain a mixture. The obtained mixture (40 parts by mass) was dry-blended with polypropylene resin "BC03B" (60 parts by mass) to obtain a resin composition. The average particle size of the crushed woody biomass roasted material in the resin composition was 50 μm. The resin composition was injection-molded using a small injection molding machine to obtain a molded product with a length of 80 mm, a width of 5 mm, and a thickness of 2 mm.

[0150] (Example B2) The pre-crushed woody biomass roasted material (50 parts by mass) obtained in the Production Example, polypropylene resin "BC03B" (40 parts by mass), and polylactic acid "FY601" (10 parts by mass) were melt-kneaded at 200°C to obtain a mixture. The obtained mixture (40 parts by mass) was dry-blended with polypropylene resin "BC03B" (60 parts by mass) to obtain a resin composition. The average particle size of the crushed woody biomass roasted material in the resin composition was 50 μm. The resin composition was injection-molded using a small injection molding machine to obtain a molded product with a length of 80 mm, a width of 5 mm, and a thickness of 2 mm.

[0151] (Example B3) The pre-crushed woody biomass roasted material (50 parts by mass) obtained in the Production Example, polypropylene resin "BC03B" (30 parts by mass), polylactic acid "FY601" (10 parts by mass), and ethylene-1-butene copolymer "DF7350" (10 parts by mass) were melt-kneaded at 200 ° C. to obtain a mixture. The obtained mixture (40 parts by mass) and polypropylene resin "BC03B" (60 parts by mass) were dry-blended to obtain a resin composition. The average particle size of the crushed woody biomass roasted material in the resin composition was 50 μm. The resin composition was injection-molded using a small injection molding machine to obtain a molded product with a length of 80 mm, a width of 5 mm, and a thickness of 2 mm.

[0152] (Comparative Example b1) The pre-crushed woody biomass roasted material obtained in the Production Example (50 parts by mass) and polypropylene resin "BC03B" (50 parts by mass) were melt-kneaded at 200°C to obtain a mixture. The obtained mixture (40 parts by mass) and polypropylene resin "BC03B" (60 parts by mass) were dry-blended to obtain a resin composition. The average particle size of the crushed woody biomass roasted material in the resin composition was 50 μm. The resin composition was injection-molded using a small injection molding machine to obtain a molded product with a length of 80 mm, a width of 5 mm, and a thickness of 2 mm.

[0153] (Comparative Example b2) The pre-crushed woody biomass roasted material (50 parts by mass) obtained in the Production Example, polypropylene resin "BC03B" (30 parts by mass), and polylactic acid "FY601" (20 parts by mass) were melt-kneaded at 200°C to obtain a mixture. The obtained mixture (40 parts by mass) was dry-blended with polypropylene resin "BC03B" (60 parts by mass) to obtain a resin composition. The average particle size of the crushed woody biomass roasted material in the resin composition was 50 μm. The resin composition was injection-molded using a small injection molding machine to obtain a molded product with a length of 80 mm, a width of 5 mm, and a thickness of 2 mm.

[0154] (Comparative Example b3) The pre-crushed woody biomass roasted material obtained in the Production Example (50 parts by mass), polypropylene resin "BC03B" (40 parts by mass), and acid-modified polyolefin "UMEX (registered trademark) 1010" (10 parts by mass) were melt-kneaded at 200 ° C to obtain a mixture. The obtained mixture (40 parts by mass) and polypropylene resin "BC03B" (60 parts by mass) were dry-blended to obtain a resin composition. The average particle diameter of the crushed woody biomass roasted material in the resin composition was 50 μm. The resin composition was injection-molded using a small injection molding machine to obtain a molded product with a length of 80 mm, a width of 5 mm, and a thickness of 2 mm.

[0155] (Comparative Example b4) The pre-crushed woody biomass roasted material (50 parts by mass) obtained in the Production Example, polypropylene resin "BC03B" (30 parts by mass), acid-modified polyolefin "UMEX (registered trademark) 1010" (10 parts by mass), and hydrogenated styrene-based thermoplastic elastomer "TUFTECH (registered trademark) M1943" (10 parts by mass) were melt-kneaded at 200 ° C. to obtain a mixture. The obtained mixture (40 parts by mass) and polypropylene resin "BC03B" (60 parts by mass) were dry-blended to obtain a resin composition. The average particle diameter of the crushed woody biomass roasted material in the resin composition was 50 μm. The resin composition was injection-molded using a small injection molding machine to obtain a molded product with a length of 80 mm, a width of 5 mm, and a thickness of 2 mm.

[0156] The compositions of the examples and comparative examples were measured and evaluated by the following methods.

[0157] (Charpy Impact Test) A V-notch was made in the molded article, and a Charpy impact test was carried out using a Charpy impact tester to measure the Charpy impact strength.

[0158]

[0159] Table 2 reveals the following: By comparing each example with a comparative example, it was found that a resin composition containing crushed woody biomass roasted material (A), a thermoplastic resin (B'), and a polyhydroxycarboxylic acid (C1), in which the content of polyhydroxycarboxylic acid (C1) relative to 100% by mass of the resin composition is more than 0.0% by mass and less than 8.0% by mass, and the mass ratio of polyhydroxycarboxylic acid (C1) to woody biomass roasted material (A) (C1 / A) is more than 0.00 and less than 0.40, can be obtained that has excellent moldability and impact resistance and reduces dependence on petroleum resources.

[0160] Next, the third aspect of the present invention will be described in detail with reference to other examples, but the scope of the present invention is not limited to these examples.

[0161] <Woody Biomass Roasted Product (A)> The following components were used for the woody biomass roasted product. Torrefied pellets: "MUCC Torrefied Pellets (registered trademark)" manufactured by UBE Mitsubishi Cement Corporation

[0162] <Thermoplastic Resin (B')> The following components were used as the polypropylene-based resin: Polypropylene resin "BC03B": manufactured by Japan Polypropylene Corporation, MFR (230°C / 2.16 kg) 30 g / 10 min Ethylene / 1-butene copolymer ("DF7350"): "Tafmer (registered trademark) DF7350" manufactured by Mitsui Chemicals, Inc., MFR (230°C / 2.16 kg) 35 g / 10 min

[0163] <Acid-Modified Polyolefin Resin (C2)> The acid-modified polyolefin resin (C2) used was the following component. Acid-modified polyolefin resin "UMEX (registered trademark) 1010": "UMEX (registered trademark) 1010" manufactured by Sanyo Chemical Industries, Ltd., acid value 52 mg KOH / g (in accordance with JIS K-0070:1992), molecular weight 30,000, viscosity 6,000 mPa s (160°C)

[0164] The kneading conditions, injection molding conditions, notching conditions, Charpy impact test, and measurement of average particle size were the same as in the example of the first embodiment.

[0165] [Examples and Comparative Examples] (Production Examples) Roasted woody biomass was pre-crushed using a mixer mill, and pre-crushed material with an average particle size of 15 mm or less was used in the examples and comparative examples.

[0166] (Example C1) Pre-crushed woody biomass roasted material (50 parts by mass) obtained in the production example, polypropylene resin "BC03B" (19.95 parts by mass), ethylene / 1-butene copolymer "DF7350" (30 parts by mass), and acid-modified polyolefin resin "UMEX (registered trademark) 1010" (0.05 parts by mass) were melt-kneaded at 200 ° C. to obtain a mixture. The obtained mixture (40 parts by mass) and polypropylene resin "BC03B" (60 parts by mass) were dry-blended to obtain a resin composition (A / B' (polypropylene resin) / B' (ethylene / 1-butene copolymer) / C2 = 20 / 67.98 / 12 / 0.02 (mass ratio)). The average particle size of the crushed woody biomass roasted material in the resin composition was 50 μm. The resulting resin composition was then injection molded using a small injection molding machine to obtain a molded product having a length of 80 mm, a width of 5 mm and a thickness of 2 mm.

[0167] (Example C2) Pre-crushed woody biomass roasted material (50 parts by mass) obtained in the Production Example, polypropylene resin "BC03B" (19.8 parts by mass), ethylene-1-butene copolymer "DF7350" (30 parts by mass), and acid-modified polyolefin resin "UMEX (registered trademark) 1010" (0.2 parts by mass) were melt-kneaded at 200 ° C. to obtain a mixture. The obtained mixture (40 parts by mass) and polypropylene resin "BC03B" (60 parts by mass) were dry-blended to obtain a resin composition (A / B' (polypropylene resin) / B' (ethylene-1-butene copolymer) / C2 = 20 / 67.92 / 12 / 0.08 (mass ratio)). The average particle size of the crushed woody biomass roasted material in the resin composition was 50 μm. Next, the obtained resin composition was injection-molded using a small injection molding machine to obtain a molded product with a length of 80 mm, a width of 5 mm, and a thickness of 2 mm.

[0168] (Comparative Example c1) The pre-crushed woody biomass roasted material obtained in the Production Example (50 parts by mass) and polypropylene resin "BC03B" (50 parts by mass) were melt-kneaded at 200°C to obtain a mixture. The obtained mixture (40 parts by mass) and polypropylene resin "BC03B" (60 parts by mass) were dry-blended to obtain a resin composition (A / B' = 20 / 80 (mass ratio)). The average particle size of the crushed woody biomass roasted material in the resin composition was 50 μm. The obtained resin composition was then injection-molded using a small injection molding machine to obtain a molded product with a length of 80 mm, a width of 5 mm, and a thickness of 2 mm.

[0169] (Comparative Example c2) The pre-crushed woody biomass roasted material obtained in the Production Example (50 parts by mass), polypropylene resin "BC03B" (40 parts by mass), and acid-modified polyolefin resin "UMEX (registered trademark) 1010" (10 parts by mass) were melt-kneaded at 200 ° C. to obtain a mixture. The obtained mixture (40 parts by mass) and polypropylene resin "BC03B" (60 parts by mass) were dry-blended to obtain a resin composition (A / B' / C2 = 20 / 76 / 4 (mass ratio)). The average particle size of the crushed woody biomass roasted material in the resin composition was 50 μm. The obtained resin composition was then injection-molded using a small injection molding machine to obtain a molded product with a length of 80 mm, a width of 5 mm, and a thickness of 2 mm.

[0170] The compositions of the examples and comparative examples were measured and evaluated by the following methods.

[0171] (Charpy Impact Test) A V-notch was made in the molded article, and a Charpy impact test was carried out using a Charpy impact tester to measure the Charpy impact strength.

[0172]

[0173] Table 3 reveals the following: By comparing the examples and comparative examples, it was found that by adding the acid-modified polyolefin resin (C2) to the crushed woody biomass roasted material (A) and the thermoplastic resin (B') so that the mass ratio (C2 / A) of the acid-modified polyolefin resin (C2) to the woody biomass roasted material (A) is more than 0.0000 and less than 0.1000, a resin composition excellent in moldability and Charpy impact strength and with reduced dependence on petroleum resources can be obtained.

[0174] The present invention includes the following aspects. [Aspect 1-1] A resin composition comprising woody biomass roasted material (A) and a thermoplastic resin (B), wherein the thermoplastic resin (B) comprises a polypropylene-based resin (B1) and a copolymerized polyolefin resin (B2), and wherein the mass ratio (B2 / (B1+B2)) of the copolymerized polyolefin resin (B2) to the total mass of the polypropylene-based resin (B1) and the copolymerized polyolefin resin (B2) is greater than 0.00 and not greater than 0.20, with the proviso that the copolymerized polyolefin resin (B2) excludes the polypropylene-based resin (B1). [Aspect 1-2] The resin composition according to Aspect 1-1, wherein the woody biomass roasted material (A) is a crushed material, and the average particle size thereof is 20 μm or more and 600 μm or less. [Aspect 1-3] The resin composition according to Aspect 1-1 or 1-2, wherein the polypropylene resin (B1) comprises at least one selected from the group consisting of a propylene homopolymer and a propylene-ethylene block copolymer. [Aspect 1-4] The resin composition according to Aspect 1-1 or 1-2, wherein the copolymerized polyolefin resin (B2) is an ethylene-α-olefin copolymer. [Aspect 1-5] The resin composition according to Aspect 1-5, wherein the Charpy impact strength measured in accordance with JIS K6921-2:2018 is 4.5 kJ / m ２The resin composition according to Aspect 1-1 or 1-2, wherein the content of the woody biomass roasted material (A) is 5% by mass or more and 60% by mass or less, relative to 100% by mass of the resin composition. [Aspect 1-7] A molded article formed from the resin composition according to Aspect 1-1 or 1-2. [Aspect 1-8] A vehicle equipped with the molded article according to Aspect 1-7. [Aspect 1-9] A method for producing a resin composition, comprising: a step of heating and kneading woody biomass roasted material (A) and a thermoplastic resin (B) at 180°C or higher and 230°C or lower; wherein the thermoplastic resin (B) comprises a polypropylene-based resin (B1) and a copolymerized polyolefin resin (B2); and a mass ratio (B2 / (B1+B2)) of the copolymerized polyolefin resin (B2) to the total mass of the polypropylene-based resin (B1) and the copolymerized polyolefin resin (B2) is greater than 0.00 and not greater than 0.20. However, the copolymerized polyolefin resin (B2) excludes the polypropylene-based resin (B1). [Aspect 1-10] The method for producing a resin composition according to Aspect 1-9, wherein the heating and kneading step uses pre-crushed material of the woody biomass roasted material (A), and the pre-crushed material has an average particle size of 15 mm or less. [Aspect 2-1] A resin composition comprising woody biomass roasted product (A), a thermoplastic resin (B) having no acidic groups, and a polyhydroxycarboxylic acid (C), wherein the content of the polyhydroxycarboxylic acid (C) relative to 100% by mass of the resin composition is more than 0.0% by mass and less than 8.0% by mass, and the mass ratio of the polyhydroxycarboxylic acid (C) to the woody biomass roasted product (A) (C / A) is more than 0.00 and less than 0.40. [Aspect 2-2] The resin composition according to Aspect 2-1, wherein the woody biomass roasted product (A) is a crushed product having an average particle size of 20 μm or more and 600 μm or less. [Aspect 2-3] The resin composition according to Aspect 2-1 or 2-2, wherein the content of the polyhydroxycarboxylic acid (C) relative to 100% by mass of the resin composition is more than 0.0% by mass and less than 6.0% by mass.[Aspect 2-4] The resin composition according to Aspect 2-1 or 2-2, wherein the polyhydroxycarboxylic acid (C) comprises at least one selected from the group consisting of polylactic acid, polyglycolic acid, polycaprolactone, poly-3-hydroxybutyric acid, and poly-4-hydroxybutyric acid. [Aspect 2-5] The resin composition has a Charpy impact strength of 4.5 kJ / m as measured in accordance with JIS K6921-2:2018. ２The resin composition according to Aspect 2-1 or 2-2, wherein the content of the polyhydroxycarboxylic acid (C) is more than 0.0% by mass and less than 3.0% by mass, relative to 100% by mass of the resin composition. [Aspect 2-7] The resin composition according to Aspect 2-1 or 2-2, wherein the thermoplastic resin (B) comprises a polypropylene-based resin. [Aspect 2-8] The resin composition according to Aspect 2-1 or 2-2, wherein the content of the woody biomass roasted material (A) is 5% by mass or more and 60% by mass or less, relative to 100% by mass of the resin composition. [Aspect 2-9] A molded article formed from the resin composition according to Aspect 2-1 or 2-2. [Aspect 2-10] A vehicle equipped with the molded article according to Aspect 2-9. [Aspect 2-11] A method for producing a resin composition, comprising a step of heat-kneading woody biomass roasted product (A), a thermoplastic resin (B) having no acidic groups, and a polyhydroxycarboxylic acid (C) at 190°C or higher and 230°C or lower, wherein a content of the polyhydroxycarboxylic acid (C) relative to 100% by mass of the resin composition is more than 0.0% by mass and less than 8.0% by mass, and a mass ratio of the polyhydroxycarboxylic acid (C) to the woody biomass roasted product (A) (C / A) is more than 0.00 and less than 0.40. [Aspect 2-12] A method for producing a resin composition according to Aspect 2-11, wherein the heat-kneading step uses pre-crushed woody biomass roasted product (A), and the pre-crushed product has an average particle size of 15 mm or less. [Aspect 3-1] A resin composition comprising a woody biomass roasted product (A), a thermoplastic resin (B) having no acidic groups, and an acid-modified polyolefin resin (C), wherein the content of the acid-modified polyolefin resin (C) relative to 100% by mass of the resin composition is more than 0.00% by mass and less than 0.10% by mass, and the mass ratio of the acid-modified polyolefin resin (C) to the woody biomass roasted product (A) (C / A) is more than 0.0000 and less than 0.0050. [Aspect 3-2] The resin composition according to Aspect 3-1, wherein the woody biomass roasted product (A) is a crushed product, and the average particle size thereof is 20 μm or more and 600 μm or less.[Aspect 3-3] The resin composition according to Aspect 3-1 or 3-2, wherein the content of the acid-modified polyolefin resin (C) is more than 0.00% by mass and not more than 0.08% by mass, relative to 100% by mass of the resin composition. [Aspect 3-4] The resin composition according to Aspect 3-1 or 3-2, wherein the acid-modified polyolefin resin (C) comprises at least one selected from the group consisting of maleic anhydride-modified polyethylene resins, maleic anhydride-modified polypropylene homopolymers, maleic anhydride-modified polypropylene copolymers, and ethylene-(meth)acrylic acid copolymers. [Aspect 3-5] The resin composition has a Charpy impact strength of 4.5 kJ / m as measured in accordance with JIS K6921-2:2018. ２ The resin composition according to Aspect 3-1 or 3-2, wherein the thermoplastic resin (B) comprises a polypropylene-based resin. [Aspect 3-7] The resin composition according to Aspect 3-1 or 3-2, wherein the content of the woody biomass roasted product (A) relative to 100% by mass of the resin composition is 5% by mass or more and 60% by mass or less. [Aspect 3-8] A molded article formed from the resin composition according to Aspect 3-1 or 3-2. [Aspect 3-9] A vehicle equipped with the molded article according to Aspect 3-8. [Aspect 3-10] A method for producing a resin composition, comprising a step of heat-kneading woody biomass roasted product (A), a thermoplastic resin (B) having no acidic groups, and an acid-modified polyolefin resin (C) at 190°C or higher and 230°C or lower, wherein the content of the acid-modified polyolefin resin (C) relative to 100% by mass of the resin composition is more than 0.00% by mass and less than 0.10% by mass, and the mass ratio (C / A) of the acid-modified polyolefin resin (C) to the woody biomass roasted product (A) is more than 0.0000 and less than 0.0050. [Aspect 3-11] A method for producing a resin composition according to Aspect 3-10, wherein the heat-kneading step uses pre-crushed woody biomass roasted product (A), and the pre-crushed product has an average particle size of 15 mm or less.

Claims

1. A resin composition comprising woody biomass roasted material (A) and a thermoplastic resin (B), wherein the thermoplastic resin (B) comprises a polypropylene-based resin (B1) and a copolymer polyolefin resin (B2), wherein the mass ratio (B2 / (B1+B2)) of the copolymer polyolefin resin (B2) to the total mass of the polypropylene-based resin (B1) and the copolymer polyolefin resin (B2) is greater than 0.00 and less than 0.80, and the mass ratio (B2 / A) of the copolymer polyolefin resin (B2) to the woody biomass roasted material (A) is greater than 0.00 and less than 1.00, with the proviso that the copolymer polyolefin resin (B2) excludes the polypropylene-based resin (B1).

2. A resin composition comprising woody biomass roasted material (A), a thermoplastic resin (B') having no acidic groups, and a polyhydroxycarboxylic acid (C1), wherein the content of the polyhydroxycarboxylic acid (C1) relative to 100% by mass of the resin composition is greater than 0.0% by mass and less than 8.0% by mass, and the mass ratio (C1 / A) of the polyhydroxycarboxylic acid (C1) to the woody biomass roasted material (A) is greater than 0.00 and less than 0.

40.

3. A resin composition comprising woody biomass roasted material (A), a thermoplastic resin (B') having no acidic groups, and an acid-modified polyolefin resin (C2), wherein the content of the acid-modified polyolefin resin (C2) relative to 100% by mass of the resin composition is more than 0.00% by mass and less than 1.00% by mass, and the mass ratio (C2 / A) of the acid-modified polyolefin resin (C2) to the woody biomass roasted material (A) is more than 0.0000 and less than 0.1000.

4. The resin composition according to any one of claims 1 to 3, wherein the woody biomass roasted material (A) is a crushed material having an average particle size of 20 μm or more and 600 μm or less.

5. A resin composition according to claim 1, wherein the mass ratio (B2 / (B1+B2)) of the copolymerized polyolefin resin (B2) to the total mass of the polypropylene-based resin (B1) and the copolymerized polyolefin resin (B2) is greater than 0.00 and not greater than 0.

20.

6. The resin composition according to claim 1, wherein the polypropylene resin (B1) comprises at least one selected from the group consisting of propylene homopolymers and propylene-ethylene block copolymers.

7. The resin composition according to claim 1, wherein the copolymer polyolefin resin (B2) is an ethylene-α-olefin copolymer.

8. Charpy impact strength measured according to JIS K6921-2:2018 is 4.5 kJ / m ２ The resin composition according to any one of claims 1 to 3.

9. A resin composition according to any one of claims 1 to 3, wherein the content of the woody biomass roasted material (A) relative to 100% by mass of the resin composition is 5% by mass or more and 60% by mass or less.

10. A molded article formed from the resin composition according to any one of claims 1 to 3.

11. A vehicle comprising the molded article according to claim 10.

12. A method for producing a resin composition, comprising a step of heating and kneading woody biomass roasted material (A) and a thermoplastic resin (B) at 180°C or higher and 230°C or lower, wherein the thermoplastic resin (B) comprises a polypropylene-based resin (B1) and a copolymer polyolefin resin (B2), the mass ratio (B2 / (B1+B2)) of the copolymer polyolefin resin (B2) to the total mass of the polypropylene-based resin (B1) and the copolymer polyolefin resin (B2) is more than 0.00 and less than 0.80, and the mass ratio (B2 / A) of the woody biomass roasted material (A) to the copolymer polyolefin resin (B2) is more than 0.00 and less than 1.00, with the proviso that the copolymer polyolefin resin (B2) excludes the polypropylene-based resin (B1).

13. The method for producing a resin composition according to claim 12, wherein the heating and kneading step uses pre-crushed woody biomass roasted material (A), and the pre-crushed material has an average particle size of 15 mm or less.

14. A resin composition according to claim 2, wherein the content of the polyhydroxycarboxylic acid (C1) relative to 100% by mass of the resin composition is more than 0.0% by mass and not more than 6.0% by mass.

15. The resin composition according to claim 2, wherein the polyhydroxycarboxylic acid (C1) comprises at least one selected from the group consisting of polylactic acid, polyglycolic acid, polycaprolactone, poly-3-hydroxybutyric acid, and poly-4-hydroxybutyric acid.

16. A resin composition according to claim 2, wherein the content of the polyhydroxycarboxylic acid (C1) relative to 100% by mass of the resin composition is greater than 0.0% by mass and less than 3.0% by mass.

17. The resin composition according to claim 2, wherein the thermoplastic resin (B') includes a polypropylene-based resin.

18. A method for producing a resin composition, comprising a step of heating and kneading woody biomass roasted material (A), a thermoplastic resin (B') having no acidic groups, and a polyhydroxycarboxylic acid (C1) at 190°C or higher and 230°C or lower, wherein the content of the polyhydroxycarboxylic acid (C1) relative to 100% by mass of the resin composition is more than 0.0% by mass and less than 8.0% by mass, and the mass ratio of the polyhydroxycarboxylic acid (C1) to the woody biomass roasted material (A) (C1 / A) is more than 0.00 and less than 0.

40.

19. The method for producing a resin composition according to claim 18, wherein the heating and kneading step uses pre-crushed material of the woody biomass roasted material (A), and the average particle size of the pre-crushed material is 15 mm or less.

20. A resin composition according to claim 3, wherein the content of the acid-modified polyolefin resin (C2) relative to 100% by mass of the resin composition is greater than 0.00% by mass and not more than 0.10% by mass.

21. The resin composition according to claim 3, wherein the acid-modified polyolefin resin (C2) comprises at least one selected from the group consisting of maleic anhydride-modified polyethylene resins, maleic anhydride-modified polypropylene homopolymers, maleic anhydride-modified polypropylene copolymers, and ethylene-(meth)acrylic acid copolymers.

22. The resin composition according to claim 3, wherein the thermoplastic resin (B') includes a polypropylene-based resin.

23. A method for producing a resin composition, comprising a step of heating and kneading woody biomass roasted material (A), a thermoplastic resin (B') having no acidic groups, and an acid-modified polyolefin resin (C2) at 190°C or higher and 230°C or lower, wherein the content of the acid-modified polyolefin resin (C2) relative to 100% by mass of the resin composition is more than 0.00% by mass and less than 1.00% by mass, and the mass ratio (C2 / A) of the acid-modified polyolefin resin (C2) to the woody biomass roasted material (A) is more than 0.0000 and less than 0.1000.

24. The method for producing a resin composition according to claim 23, wherein the heating and kneading step uses pre-crushed material of the woody biomass roasted material (A), and the average particle size of the pre-crushed material is 15 mm or less.

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