Polypropylene resin composition

Abstract

To provide a polypropylene resin composition which suppresses a plastic feeling while improving odor.SOLUTION: The polypropylene resin composition contains 5-85 mass% of a polypropylene resin (A) having a melting point of 150°C or higher, 5-85 mass% of a polypropylene resin (B) having a melting point of 110°C or higher and lower than 150°C, and 10-80 mass% of a biomass material (C) (provided that the total mass of (A), (B) and (C) is 100 mass%).SELECTED DRAWING: None

Description

[Technical field]

[0001] The present invention relates to a polypropylene resin composition containing a biomass material, and to an extruded foam, an injection foam, a sheet, a thermoformed article, and a blow molded article made of the polypropylene resin composition. [Background technology]

[0002] Polypropylene is used in all industrial fields because it has various excellent physical properties including heat resistance and can be produced at low cost. In recent years, from the viewpoint of global warming and environmental protection, there has been a demand for reducing CO2 emissions, and as a measure to this end, the use of biomass materials capable of adsorbing and fixing CO2 in the atmosphere has been proposed in many fields. For example, a composition has been proposed in which polypropylene is composited with biomass materials such as wood flour (Patent Document 1). Polypropylene resin compositions in which polypropylene is composited with wood flour can retain the properties of wood such as scent and color, even though they are semi-plastic, giving the feeling of warmth of wood that cannot be expressed with plastic, and their uses are expanding, such as for artificial wood, etc.

[0003] When biomass materials are compounded with polypropylene and the compounded polypropylene resin composition is molded into various molded products, a processing temperature of, for example, about 180 to 200°C is required, but at such high temperatures, the biomass materials emit a strong odor, which has a significant adverse effect on workers. If the processing temperature is lowered to suppress the generation of odor, problems arise in that processing becomes difficult in the first place and the appearance quality of the resulting molded product deteriorates.

[0004] In order to solve such problems during molding, a propylene-based resin composition consisting of 10 to 90 parts by weight of a propylene-based resin having a melting point of 110 to 150°C and 90 to 10 parts by weight of a lignocellulosic or cellulose-based material has been proposed (Patent Document 2). The propylene-based resin composition of Patent Document 2 not only enables the molding temperature to be lowered and suppresses odor generation, but also shows that odor is improved even at high molding temperatures. [Prior art documents] [Patent documents]

[0005] [Patent Document 1] Japanese Patent Application Publication No. 6-80832 [Patent Document 2] JP 2007-169612 A Summary of the Invention [Problem to be solved by the invention]

[0006] The propylene resin composition of Patent Document 2 has an improved odor, but has a problem of a strong plastic feel in terms of color tone, etc. Therefore, an object of the present invention is to provide a polypropylene resin composition that has an improved odor and a reduced plastic feel. [Means for solving the problem]

[0007] The polypropylene resin composition of the present invention comprises 5 to 85 mass% of a polypropylene resin (A) having a melting point of 150° C. or higher, 140℃ or less and 5 to 85 mass% of a polypropylene resin (B) and 10 to 80 mass% of a biomass material (C). fruit (The sum of the masses of (A), (B) and (C) but 100% by mass.) The polypropylene resin (B) is one or more polypropylene resins selected from the group consisting of propylene-ethylene random copolymers, propylene-1-butene random copolymers, propylene-ethylene-1-butene random copolymers, propylene-ethylene random block copolymers, and propylene-ethylene-1-butene random block copolymers, and the biomass material (C) is one or more polypropylene resins selected from the group consisting of cellulose-based materials and lignocellulosic materials. It is characterized by:

[0008] The polypropylene resin (A) may be one or more polypropylene resins selected from the group consisting of propylene homopolymers, propylene-ethylene block copolymers, and propylene-ethylene-1-butene block copolymers.

[0010] Furthermore, the polypropylene resin (B) may have the following properties (b-1) and / or (b-2). (b-1) Q value is 5.0 or less (b-2) The soluble matter at or below 40°C measured by temperature rising elution fractionation (TREF) is 4.0% by mass or less

[0011] Biomass materials (C) include wood, pulp, and bamboo. , Bagasse, Massage Shell? The filler may be one or more plant-derived fillers selected from the group consisting of:

[0012] Also, a polypropylene resin composition containing 1 to 50 parts by mass of a thermoplastic elastomer (D) per 100 parts by mass of the above-mentioned polypropylene resin (A), polypropylene resin (B) and biomass material (C) (a total of 100% by mass) is preferred.

[0013] Furthermore, the extrusion foam molded product, the injection foam molded product, the sheet molded product, the thermoformed product, or the blow molded product is preferably made of the above-mentioned polypropylene resin composition. Effect of the Invention

[0014] The polypropylene resin composition of the present invention is excellent in environmental protection performance, and can suppress odor and plastic feeling. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0015] Polypropylene resin (A) The polypropylene resin (A) has a melting point of 150°C or higher, preferably 153°C or higher, and more preferably 155°C or higher. The melting point of the polypropylene resin (A) is preferably 170°C or lower. By making the melting point of the polypropylene resin (A) 150°C or higher, the rigidity and heat resistance are increased. The melting point can be adjusted by the amount of comonomer such as ethylene or butene introduced during propylene polymerization.

[0016] Here, in this specification, the melting point is a value measured by a differential scanning calorimeter (DSC). Using a differential scanning calorimeter manufactured by Seiko Corporation, about 5 mg of a sample is taken, and after holding it at 200°C for 5 minutes, it is cooled to 40°C at a temperature drop rate of 10°C / min, and then melted at a temperature increase rate of 10°C / min. The melting point is obtained from the melting calorie curve obtained when the sample is melted. In other words, the maximum peak temperature of the melting calorie curve is taken as the melting point.

[0017] The polypropylene resin (A) preferably has a melt flow rate (MFR) measured at 230°C under a load of 2.16 kg of 0.1 to 150 g / 10 min, more preferably 1 to 100 g / 10 min. Here, the MFR is a value measured at 230°C under a load of 2.16 kg in accordance with JIS K7210. The MFR of the polypropylene resin (A) can be adjusted by controlling the hydrogen concentration during polymerization, etc. If the MFR is 0.1 g / 10 min or more, the load on the extruder is suppressed during extrusion molding of a sheet, and the productivity is improved, which is preferable.

[0018] The polypropylene resin (A) has a relationship between melt flow rate (MFR) and melt tension (MT) (unit: g) that preferably satisfies log(MT)<-0.9×log(MFR)+0.7 and log(MT)<1.15, more preferably log(MT)<-0.9×log(MFR)+0.6 and log(MT)<1.04 (MT<11), and even more preferably log(MT)<-0.9×log(MFR)+0.5 and log(MT)<0.85 (MT<7).

[0019] Although there is no lower limit for the melt tension of the polypropylene resin (A), if it is too small, the drawdown resistance decreases and the moldable temperature range during thermoforming may become narrow, so that it is preferably log(MT)>0.48 (MT>3).

[0020] Here, melt tension (MT) is a value measured using a capillograph. Resin is placed in a 9.6 mm diameter cylinder heated to 230°C, and the molten resin is extruded from an orifice 2.0 mm in diameter and 40 mm long at a pushing speed of 20 mm / min. The tension detected by the pulley when the extruded resin is taken up at a speed of 4.0 m / min is measured, and this is taken as the melt tension (MT).

[0021] The polypropylene resin (A) has a Q value (Mw / Mn) calculated from the weight average molecular weight (Mw) and number average molecular weight (Mn) measured by gel permeation chromatography (GPC) of preferably 3.5 to 10, more preferably 3.7 to 8, and even more preferably 4 to 6. When the Q value of the polypropylene resin (A) is within the above range, the molding processability is particularly excellent when extrusion molding a sheet, which is preferable.

[0022] The polypropylene resin (A) preferably has no long chain branching structure. The polypropylene resin (A) preferably has a branching index g' of 1 when the absolute molecular weight Mabs determined by a light scattering meter is 1,000,000.

[0023] A direct indicator of whether a polypropylene resin has a long chain branching structure is the branching index g'. The branching index g' is given by the ratio of the intrinsic viscosity [η]br of a polymer having long chain branching structure to the intrinsic viscosity [η]lin of a linear polymer having the same molecular weight, i.e., [η]br / [η]lin, and when g'<1, it can be said that the polypropylene resin has a long chain branching structure.

[0024] The definition of the branching index g' is described in, for example, "Developments in Polymer Characterization-4" (JV Dawkins ed., Applied Science Publishers, 1983), and is an index known to those skilled in the art.

[0025] The branching index g' can be obtained as a function of the absolute molecular weight Mabs, for example, by using a light scattering meter and GPC equipped with a viscometer as a detector as described below.

[0026] The branching index g' is calculated as follows. The GPC apparatus used is Alliance GPCV2000 manufactured by Waters, equipped with a differential refractometer (RI) and a viscometer. In addition, a multi-angle laser light scattering detector (MALLS) manufactured by Wyatt Technology, DAWN-E, is used as the light scattering detector. The detectors are connected in the order of MALLS, RI, and viscometer. The mobile phase solvent is 1,2,4-trichlorobenzene (with the antioxidant Irganox1076 manufactured by BASF Japan added at a concentration of 0.5 mg / mL).

[0027] The flow rate of the mobile phase solvent is 1 mL / min, and two columns (Tosoh Corporation's GMHHR-H(S) HT) are connected together. The temperatures of the columns, sample injection section, and each detector are 140°C. The sample concentration is 1 mg / mL, and the injection volume (sample loop volume) is 0.2175 mL.

[0028] The absolute molecular weight (Mabs), the root mean square radius of gyration (Rg), and the intrinsic viscosity ([η]) are calculated using the data processing software ASTRA (version 4.73.04) attached to MALLS, and the calculations are performed with reference to the following literature. References 1.Developments in Polymer Characterization-4(JV Dawkins ed. Applied Science Publishers, 1983. Chapter 1.) Reference 2. Polymer, 45, 6495-6505 (2004) Reference 3.Macromolecules, 33, 2424-2436(2000) Reference 4.Macromolecules, 33, 6945-6952(2000)

[0029] The branching index g' is calculated as the ratio ([η]br / [η]lin) of the intrinsic viscosity ([η]br) obtained by measuring a sample with a viscometer to the intrinsic viscosity ([η]lin) obtained by separately measuring a linear polymer.

[0030] Here, a commercially available homopolypropylene (Novatec (registered trademark) PP grade name: FY6 manufactured by Japan Polypropylene Corporation) is used as the linear polymer for obtaining [η]lin. It is known that the logarithm of [η]lin of a linear polymer has a linear relationship with the logarithm of the molecular weight, as known as the Mark-Houwink-Sakurada equation, so that the value of [η]lin can be obtained by appropriately extrapolating to the low molecular weight side or the high molecular weight side.

[0031] The polypropylene resin (A) is a propylene homopolymer obtained by homopolymerizing propylene in a single stage or two or more multistage polymerization, a propylene-α-olefin random copolymer obtained by copolymerizing propylene and an α-olefin in a single stage or two or more multistage polymerization, a polymerization step (1) of homopolymerizing propylene in a single stage or two or more multistage polymerization to obtain a propylene homopolymer, a copolymerization step (2-1) of copolymerizing propylene and an α-olefin in a single stage or two or more multistage polymerization to obtain a propylene-α-olefin random copolymer, or a copolymerization step (2-2) of copolymerizing two or more α-olefins in a single stage or two or more multistage polymerization to obtain an α-olefin random copolymer. Examples of the propylene-α-olefin random block copolymer include a propylene-α-olefin block copolymer obtained by polymerization including a copolymerization step (2-2) in which propylene and an α-olefin are copolymerized in a single stage or two or more stages to obtain a propylene-α-olefin random copolymer, and a copolymerization step (2-1) in which propylene and an α-olefin are copolymerized in a single stage or two or more stages to obtain a propylene-α-olefin random copolymer, or a copolymerization step (2-2) in which two or more α-olefins are copolymerized in a single stage or two or more stages to obtain an α-olefin random copolymer. The polypropylene resin (A) may be one type or a combination of two or more types.

[0032] The α-olefin is preferably ethylene or an α-olefin having 4 to 18 carbon atoms. Specific examples include ethylene, 1-butene, 1-pentene, 1-hexene, 1-octene, 1-heptene, 4-methyl-pentene-1, 4-methyl-hexene-1, 4,4-dimethylpentene-1, etc. The α-olefin may be one type or a combination of two or more types.

[0033] The polypropylene resin (A) is preferably one or more polypropylene resins selected from the group consisting of propylene homopolymers, propylene-ethylene block copolymers, and propylene-ethylene-1-butene block copolymers.

[0034] Examples of the polypropylene resin (A) include those polymerized by a Ziegler-Natta catalyst, those polymerized by a metallocene catalyst, and those polymerized by a post-metallocene catalyst. Examples of the Ziegler-Natta catalyst include a catalyst containing a solid component essentially containing titanium, magnesium, and a halogen, an organoaluminum, and an electron donor used as needed. Examples of the metallocene catalyst include a catalyst containing a transition metal compound of Group 4 of the periodic table containing a ligand having a cyclopentadienyl skeleton, a cocatalyst, and an organometallic compound and a carrier used as needed. Examples of the post-metallocene catalyst include a catalyst containing an organometallic compound such as a bisamide compound of a metal of Group 4 of the periodic table, a bisimino compound of a metal of Groups 8 to 10 of the periodic table, and a salicylaldiminato compound of a metal of Groups 4 to 10 of the periodic table, a cocatalyst, and an organometallic compound and a carrier used as needed. As the polypropylene resin (A), commercially available products can be used, for example, the Novatec PP series manufactured by Japan Polypropylene Corporation.

[0035] Polypropylene resin (B) The polypropylene resin (B) has a melting point of 110 to less than 150°C, preferably 115 to 145°C, and more preferably 120 to 140°C. By making the melting point of the polypropylene resin (B) 110°C or higher, it is possible to reduce stickiness caused by low crystallinity components. In addition, by making the melting point of the polypropylene resin (B) less than 150°C, it is possible to relatively lower the temperature when molding the polypropylene resin composition, suppress the generation of odor, and ensure moldability and product quality. The melting point can be adjusted by the amount of comonomer such as ethylene or butene introduced during propylene polymerization, as with the polypropylene resin (A). Here, the melting point is a value measured by the same method as that for measuring the melting point of the polypropylene resin (A).

[0036] The polypropylene resin (B) preferably has a melt flow rate (MFR) measured at 230°C under a load of 2.16 kg of 0.1 to 150 g / 10 min, more preferably 1 to 100 g / 10 min. When the MFR is 0.1 g / 10 min or more, the load on the extruder is suppressed during extrusion molding of the sheet, improving productivity. Here, the MFR is a value measured at 230°C under a load of 2.16 kg in accordance with JIS K7210. The MFR of the polypropylene resin (B) can be adjusted by controlling the hydrogen concentration during polymerization, etc.

[0037] The MFR of polypropylene resin (B) preferably satisfies the following relationship. That is, when the melt flow rate of polypropylene resin (A) is MFRa and the melt flow rate of polypropylene resin (B) is MFRb, MFRa / MFRb preferably satisfies 30>MFRa / MFRb>1, and more preferably satisfies 15>MFRa / MFRb>1.5. When MFRa / MFRb is within the above value range, a molded product with smaller wall thickness deviation can be obtained.

[0038] The polypropylene resin (B) has a relationship between melt flow rate (MFR) and melt tension (MT) (unit: g) that preferably satisfies log(MT)<-0.9×log(MFR)+0.7 and log(MT)<1.15, more preferably log(MT)<-0.9×log(MFR)+0.6 and log(MT)<1.04 (MT<11), and even more preferably log(MT)<-0.9×log(MFR)+0.5 and log(MT)<0.85 (MT<7).

[0039] Although there is no lower limit for the melt tension of the polypropylene resin (B), if it is too small, the drawdown resistance decreases and the moldable temperature range during thermoforming may become narrow, so that the melt tension (MT) is preferably log(MT)>0.48 (MT>3). Here, the melt tension (MT) is a value measured by the same method as that for measuring the melt tension of the polypropylene resin (A).

[0040] (b-1) Q value The polypropylene resin (B) has a Q value of preferably 5.0 or less, more preferably 2.0 to 4.0, even more preferably 2.3 to 3.5, and even more preferably 2.6 to 3.3. Here, the Q value is defined as the ratio (Mw / Mn) of the weight average molecular weight (Mw) to the number average molecular weight (Mn) measured by GPC. By making the Q value of the polypropylene resin (B) 5.0 or less, a molded product having excellent mechanical properties can be obtained, which is preferable.

[0041] (b-2) Amount of soluble matter below 40°C measured by temperature rising elution fractionation (TREF) method The polypropylene resin (B) preferably has a content of components soluble in orthodichlorobenzene at 40° C. or less, as measured by temperature rising elution fractionation (TREF), of 4.0% by mass or less, more preferably 3.0% by mass or less, and even more preferably 1.5% by mass or less. By making the content of soluble components at 40° C. or less, as measured by temperature rising elution fractionation (TREF), 4.0% by mass or less, it is preferable to improve the affinity with the biomass material (C) and suppress bleeding from the molded article.

[0042] Components soluble in orthodichlorobenzene at 40°C include so-called low crystallinity components, such as low molecular weight components such as oligomers, components with low stereoregularity such as atactic polypropylene, and components with extremely high comonomer content. Here, components with low stereoregularity such as atactic polypropylene and low crystallinity components with extremely high comonomer content can be soluble even if they have a high molecular weight. Therefore, in order to obtain the polypropylene resin (B) preferably used in the present invention, it is necessary to avoid using a catalyst or adopting a polymerization method that can obtain polypropylene with a wide composition distribution that includes polypropylene with low stereoregularity and low crystallinity components with extremely high comonomer content.

[0043] Here, the amount of components soluble in orthodichlorobenzene at 40° C. or less measured by temperature rising elution fractionation (TREF) is a value measured according to the following procedure. The sample is dissolved in orthodichlorobenzene at 140°C to obtain a solution. This is introduced into a TREF column at 140°C under the following conditions, and then cooled to 100°C at a temperature drop rate of 8°C / min, and then cooled to 40°C at a temperature drop rate of 4°C / min, and held for 10 minutes. The solvent orthodichlorobenzene is then passed through the column at a flow rate of 1mL / min to elute the components dissolved in orthodichlorobenzene at 40°C in the TREF column for 10 minutes, and then the column is heated linearly to 140°C at a temperature increase rate of 100°C / hour to obtain an elution curve. Column size: 4.3mmφ×150mm Column packing material: 100 μm surface deactivated glass beads Solvent: orthodichlorobenzene Sample concentration: 5mg / mL Sample injection volume: 0.2 mL Solvent flow rate: 1mL / min Detector: Fixed wavelength infrared detector FOXBORO MIRAN 1A Measurement wavelength: 3.42μm From the elution curve obtained under the above conditions, the ratio (mass %) of the amount of the component eluted at 40° C. to the total amount of the sample is calculated.

[0044] Polypropylene resin (B) is a propylene homopolymer obtained by homopolymerizing propylene in a single stage or two or more multistage polymerization, a propylene-α-olefin random copolymer obtained by copolymerizing propylene and an α-olefin in a single stage or two or more multistage polymerization, a polymerization step (1) of homopolymerizing propylene in a single stage or two or more multistage polymerization to obtain a propylene homopolymer, a copolymerization step (2-1) of copolymerizing propylene and an α-olefin in a single stage or two or more multistage polymerization to obtain a propylene-α-olefin random copolymer, or a copolymerization step (2-2) of copolymerizing two or more α-olefins in a single stage or two or more multistage polymerization to obtain an α-olefin random copolymer. Examples of the propylene-α-olefin random block copolymer include a propylene-α-olefin block copolymer obtained by polymerization including a copolymerization step (2-2) in which propylene and an α-olefin are copolymerized in a single stage or two or more stages to obtain a propylene-α-olefin random copolymer, and a copolymerization step (2-1) in which propylene and an α-olefin are copolymerized in a single stage or two or more stages to obtain a propylene-α-olefin random copolymer, or a copolymerization step (2-2) in which two or more α-olefins are copolymerized in a single stage or two or more stages to obtain an α-olefin random copolymer. The polypropylene resin (B) may be one type or a combination of two or more types.

[0045] The α-olefin is preferably ethylene or an α-olefin having 4 to 18 carbon atoms. Specific examples include ethylene, 1-butene, 1-pentene, 1-hexene, 1-octene, 1-heptene, 4-methyl-pentene-1, 4-methyl-hexene-1, 4,4-dimethylpentene-1, etc. The α-olefin may be one type or a combination of two or more types.

[0046] The polypropylene resin (B) is preferably one or more polypropylene resins selected from the group consisting of propylene-ethylene random copolymers, propylene-1-butene random copolymers, propylene-ethylene-1-butene random copolymers, propylene-ethylene random block copolymers, and propylene-ethylene-1-butene random block copolymers.

[0047] The polypropylene resin (B) contains 85 to 100 mol %, preferably 90 to 99.5 mol %, and more preferably 92 to 98.5 mol % of propylene units and 0 to 15 mol %, preferably 0.5 to 10 mol %, and more preferably 1.5 to 8 mol % of ethylene units and / or 1-butene units. Here, the propylene unit and the ethylene and / or 1-butene unit are values ​​measured by Fourier transform infrared analysis.

[0048] Examples of the polypropylene resin (B) include those polymerized by a Ziegler-Natta catalyst, those polymerized by a metallocene catalyst, and those polymerized by a post-metallocene catalyst. Examples of the Ziegler-Natta catalyst include a catalyst containing a solid component essentially containing titanium, magnesium, and a halogen, an organoaluminum, and an electron donor used as needed. Examples of the metallocene catalyst include a catalyst containing a transition metal compound of Group 4 of the periodic table containing a ligand having a cyclopentadienyl skeleton, a cocatalyst, and an organometallic compound and a carrier used as needed. Examples of the post-metallocene catalyst include a catalyst containing an organometallic compound such as a bisamide compound of a metal of Group 4 of the periodic table, a bisimino compound of a metal of Groups 8 to 10 of the periodic table, and a salicylaldiminato compound of a metal of Groups 4 to 10 of the periodic table, a cocatalyst, and an organometallic compound and a carrier used as needed. As the polypropylene resin (B), commercially available products can be used, for example, the WINTEC series manufactured by Japan Polypropylene Corporation.

[0049] Biomass Materials (C) The biomass material (C) is an organic resource derived from animals and plants, excluding fossil resources, and is preferably an organic resource derived from plants, excluding fossil resources. Examples of the organic resource derived from plants, excluding fossil resources, include cellulosic materials, lignocellulosic materials, and starch materials.

[0050] Examples of cellulosic materials include alpha fiber flocs obtained by treating wood pulp with alkali and shredding it mechanically, cotton linters and cotton flocs obtained from cottonseeds, and rayon flocs obtained by shredding rayon. Examples of lignocellulosic materials include lignocellulosic fibers and lignocellulosic powders. Specific examples include wood pulp, refiner graft pulp (RGP), paper pulp, waste paper, crushed wood chips, wood flour, and fruit shell powder. There are no particular limitations on the shape of these cellulosic and lignocellulosic materials, and fibrous or powdery materials can be used. Specific examples of wood flour include crushed pine, fir, poplar, bamboo, bagasse, and oil palm trunks, as well as sawdust and canna dust, and examples of fruit shell powder include crushed fruits such as walnuts, peanuts, and palms.

[0051] The cellulosic material or lignocellulosic material may be an esterified cellulosic material or an esterified lignocellulosic material obtained by adding a polybasic acid anhydride to a hydroxyl group of a cellulosic material or a lignocellulosic material, an oligoesterified cellulosic material or an oligoesterified lignocellulosic material obtained by adding a polybasic acid anhydride and a monoepoxy compound to a hydroxyl group of a cellulosic material or a lignocellulosic material, or an oligoesterified cellulosic material or an oligoesterified lignocellulosic material obtained by adding a polybasic acid anhydride and a polyhydric alcohol to a hydroxyl group of a cellulosic material or a lignocellulosic material.

[0052] Examples of polybasic acid anhydrides include maleic anhydride, succinic anhydride, phthalic anhydride, hexahydrophthalic anhydride, tetrahydrophthalic anhydride, dichloromaleic anhydride, itaconic anhydride, tetrabromophthalic anhydride, HET anhydride, trimellitic anhydride, pyromellitic anhydride, and the like. Of these, maleic anhydride, succinic anhydride, and phthalic anhydride are particularly preferred because they are industrially advantageous and inexpensive.

[0053] The monoepoxy compound may be any compound containing one epoxy group in the molecule, and examples thereof include phenyl glycidyl ether, allyl glycidyl ether, styrene oxide, octylene oxide, methyl glycidyl ether, butyl glycidyl ether, and cresyl glycidyl ether.

[0054] Examples of polyhydric alcohols include ethylene glycol, propylene glycol, trimethylene glycol, 1,4-butanediol, 1,5-pentanediol, 1,6-hexanediol, 1,7-heptanediol, 1,8-octanediol, 1,9-nonanediol, 1,10-decanediol, pinacol, hydrobenzoin, benzpinacol, cyclopentane-1,2-diol, cyclohexane-1,2-diol, cyclohexane-1,4-diol, glycerin, polyethylene glycol 400, and the like.

[0055] A typical method for carrying out the esterification involves mixing the polybasic acid anhydride (or the polybasic acid anhydride and the monoepoxy compound, or the polybasic acid anhydride and the polyhydric alcohol) in the presence of a cellulosic material or a lignocellulosic material, and reacting the mixture at a temperature of 60 to 150°C for 0.5 to 8 hours.

[0056] In the case of the reaction of alternately adding and esterifying the polybasic acid anhydride and the monoepoxy compound to the hydroxyl groups in the cellulosic or lignocellulosic material components, the reaction proceeds sufficiently without a catalyst, but a basic catalyst such as sodium carbonate, dimethylbenzylamine, tetramethylammonium chloride, or pyridine may be used to promote the reaction. An addition esterification catalyst may also be used.

[0057] From the viewpoints of ease of use and effectiveness, the molecular weight of the oligomer of the polybasic acid anhydride and the monoepoxy compound is preferably about 20 to 1000 (the degree of polymerization is preferably 5 or less, including 1) which can be liquid.

[0058] The blending amounts of the polybasic acid anhydride and the monoepoxy compound are as follows. First, the polybasic acid anhydride is used in an amount of 5 to 120 parts by mass, preferably 10 to 100 parts by mass, per 100 parts by mass of dried cellulosic or lignocellulosic material. The monoepoxy compound is preferably used in an amount of 0.5 to 2.0 equivalents of epoxy groups per equivalent of anhydride acid group of the polybasic acid anhydride used. This is because, if the polybasic acid anhydride is used in an amount of more than 120 parts by mass per 100 parts by mass of dried cellulosic or lignocellulosic material, the content of lignocellulosic or cellulosic material components is reduced, which is undesirable as it causes bleeding during hot-press molding, and if the amount is less than 5 parts by mass, the hot-press flowability is reduced, and furthermore, a uniform molded product cannot be obtained, which is undesirable.

[0059] In the case of a reaction in which the polybasic acid anhydride and the polyhydric alcohol are alternately added to and esterified with the hydroxyl groups of a cellulosic or lignocellulosic material, the monoepoxy compound may be replaced with the polyhydric alcohol.

[0060] Specific examples of starch-based materials include rice, wheat, corn, sugarcane, potato, sweet potato, tapioca, corn starch, potato starch, potato starch, tapioca starch, and lightly acetylated products thereof. Any agricultural product containing starch can be used without being limited to these. These starch-based materials can be used in the general state when stockpiled, or after simple pretreatment such as washing, removing parts that do not contain starch such as the husk, and cutting into appropriate sizes. Starch-based materials are usually obtained in granular form, and can be used as they are.

[0061] Furthermore, it is more preferable that the starch-based material used as the raw material is subjected to such a simple pretreatment and then to a gelatinization treatment as described below. In other words, the starch constituting the starch-based material initially has a crystalline structure (β structure), but when placed in a temperature environment of 70°C or higher in the presence of an appropriate amount of moisture, this β structure collapses and changes to an amorphous structure (α structure). In this way, the change from β structure to α structure caused by heating raw starch containing moisture is called gelatinization. The starch grains exhibiting the α structure of this gelatinized material are in a state where they are easily dissolved at the molecular level of starch in the thermally flowing polypropylene resin and dispersed finely and uniformly, compared to when they were in the β structure in the initial heated state (raw state).

[0062] Specific examples of processes for converting starch having a β structure to an α structure include heat treatments that are generally carried out when the starch is used for food, such as immersing the starch in water and boiling it or steaming it with water vapor.

[0063] It is generally known that when starch having an amorphous α-structure is left at low temperatures while still containing moisture, it undergoes a phenomenon known as retrogradation, in which it reverts to the original crystalline β-structure over time. On the other hand, it is known that if moisture is removed from starch having an amorphous α-structure, the starch maintains its α-structure and does not reversibly transition to the β-structure (does not retrograde), even when left at low temperatures for a long period of time.

[0064] Therefore, the starch-based material used as the raw material in the present invention is one in which the starch structure is an α-structure (amorphous structure), and includes both a state containing moisture and a state not containing moisture (dehydrated). In any case, if the starch structure of the starch-based material to be blended with the polypropylene resin is an α-structure (amorphous structure), the molecular chains of the starch are loosened in the matrix of the polypropylene resin during the kneading process described below, and the starch becomes finer and more easily dispersed. This is an effect that cannot be obtained when blending a non-heated starch-based material with a β-structure (crystalline structure).

[0065] Specifically, a method for obtaining a dehydrated α-structure starch-based material is to heat it in the presence of moisture to gelatinize it, and then reduce the pressure of the atmosphere using a vacuum device. If such a dehydrated α-structure starch-based material is used, it is possible to store the starch-based material alone for a long period of time since it is less likely to age, which contributes to shortening the production period and reducing the production costs of the polypropylene resin composition.

[0066] The water used to convert the starch having a β structure to an α structure as described above contains dissolved trehalose. The effect of this is that, for example, when rice is used as the starch-based material, the trehalose acts to suppress the decomposition of the lipid components of the rice by impregnating the raw rice with an aqueous trehalose solution, and the deterioration over time of the polypropylene resin composition produced using the rice is suppressed. The reason for this is said to be that trehalose has the effect of coating the rice components and protecting the fatty acids from oxidative decomposition.

[0067] Such an effect is not limited to rice, but can also be exhibited by general starch-based materials, and examples of materials having such an effect include, in addition to the above-mentioned trehalose, salt, sucrose, antioxidants, protein decomposition promoters, cellulosic decomposition promoters, etc. By adding these substances to water to form an α-structure in the starch-based material, the effect of preventing the characteristic odor, scorching, and coloring of the produced polypropylene resin composition can also be obtained.

[0068] So far, we have explained that starch-based materials that have already been gelatinized are used as the raw materials. However, by using the production method described below, starch-based materials having a β structure that contain moisture can also be used.

[0069] Specifically, raw rice is soaked in water for a predetermined time, drained, and then put into a kneader together with polypropylene resin and kneaded at the thermal flow temperature of the polypropylene resin. This thermal flow temperature (usually 100 to 170°C) is sufficient to transition the starch structure of raw rice from β structure to α structure, so the raw rice is gelatinized during the kneading process. After the raw rice is converted to α structure in this way, as already mentioned above, the molecular chains of the starch are loosened, refined, and dispersed in the matrix of the polypropylene resin.

[0070] Here, in order for raw rice with a β structure to be heated and turn into an α structure, it is desirable for the moisture content to be 17% by mass or more, and for this to happen, it is necessary to soak it in water for 5 minutes or more. Also, for starch-based materials such as potatoes, which contain enough moisture to turn their starch into an α structure, there is no need to soak them in water like rice, and they can be put directly into the kneader.

[0071] The biomass material (C) is preferably one or more plant-derived fillers selected from the group consisting of wood, pulp, bamboo, sugarcane (bagasse), rice husks, and rice (starch).

[0072] The polypropylene resin composition of the present invention contains 5-85% by mass of polypropylene resin (A), 5-85% by mass of polypropylene resin (B), and 10-80% by mass of biomass material (C), preferably 10-75% by mass of polypropylene resin (A), 10-75% by mass of polypropylene resin (B), and 15-70% by mass of biomass material (C), more preferably 15-65% by mass of polypropylene resin (A), 15-65% by mass of polypropylene resin (B), and 20-60% by mass of biomass material (C), and even more preferably 20-55% by mass of polypropylene resin (A), 20-55% by mass of polypropylene resin (B), and 25-55% by mass of biomass material (C). Here, the total amount of the mass proportions of (A), (B), and (C) is 100% by mass.

[0073] Thermoplastic elastomer (D) The polypropylene resin composition may optionally contain a thermoplastic elastomer (D). Examples of the thermoplastic elastomer (D) include olefin-based elastomers and styrene-based elastomers. These may be used alone or in combination of two or more.

[0074] Examples of olefin-based elastomers include ethylene-propylene copolymer elastomers (EPR), ethylene-butene copolymer elastomers (EBR), ethylene-hexene copolymer elastomers (EHR), ethylene-octene copolymer elastomers (EOR), ethylene-propylene-ethylidenenorbornene copolymers, ethylene-propylene-butadiene copolymers, ethylene-propylene-isoprene copolymers, and other ethylene-α-olefin-diene terpolymer elastomers, as well as hydrogenated polymer elastomers such as ethylene-ethylene-butylene-ethylene copolymers (CEBC), etc. Among these, ethylene-propylene copolymer elastomers, ethylene-butene copolymer elastomers, and ethylene-hexene copolymer elastomers are preferred.

[0075] Examples of styrene-based elastomers include styrene-butadiene-styrene triblock copolymer elastomer (SBS), styrene-isoprene-styrene triblock copolymer elastomer (SIS), styrene-ethylene-butylene copolymer elastomer (SEB), styrene-ethylene-propylene copolymer elastomer (SEP), styrene-ethylene-butylene-styrene copolymer elastomer (SEBS), styrene-ethylene-butylene-ethylene copolymer elastomer (SEBC), hydrogenated styrene-butadiene elastomer (HSBR), styrene-ethylene-propylene-styrene copolymer elastomer (SEPS), styrene-ethylene-ethylene-propylene-styrene copolymer elastomer (SEEPS), styrene-butadiene-butylene-styrene copolymer elastomer (SBBS), partially hydrogenated styrene-isoprene-styrene copolymer elastomer, and partially hydrogenated styrene-isoprene-butadiene-styrene copolymer elastomer.

[0076] The thermoplastic elastomer (D) preferably has an MFR of 0.01 to 10 g / 10 min, more preferably 0.1 to 3 g / 10 min, measured at 190° C. under a load of 2.16 kg. When the thermoplastic elastomer (D) has an MFR of 0.1 g / 10 min or more, the load on the extruder is reduced during extrusion molding of a sheet, improving productivity. In addition, when the MFR is 10 g / 10 min or less, the melt tension of the sheet can be kept high, and the molded product does not sag under its own weight during extrusion molding or thermoforming, which is preferable.

[0077] The polypropylene resin composition of the present invention preferably contains 1 to 50 parts by mass, more preferably 2 to 44 parts by mass, even more preferably 4 to 38 parts by mass, and even more preferably 8 to 32 parts by mass of the thermoplastic elastomer (D) relative to 100 parts by mass consisting of 100% by mass of the polypropylene resin (A), the polypropylene resin (B), and the biomass material (C).

[0078] (3) Compatibilizer In the polypropylene resin composition, a compatibilizer can be blended as necessary. Examples of the compatibilizer preferably used include saturated carboxylic acid, unsaturated carboxylic acid or derivatives thereof, thermoplastic resins modified with unsaturated carboxylic acid or derivatives thereof, and cellulose-based materials, lignocellulose-based materials, and starch-based materials modified with unsaturated carboxylic acid or derivatives thereof. Furthermore, oil-modified alkyd resins or derivatives thereof, and modified starch or derivatives thereof can also be used.

[0079] Examples of saturated carboxylic acids include succinic anhydride, succinic acid, phthalic anhydride, phthalic acid, tetrahydrophthalic anhydride, adipic anhydride, etc. Examples of unsaturated carboxylic acids include maleic anhydride, maleic acid, nadic anhydride, itaconic anhydride, itaconic acid, citraconic anhydride, citraconic acid, crotonic acid, isocrotonic acid, mesaconic acid, angelic acid, sorbic acid, acrylic acid, etc. Examples of derivatives of saturated or unsaturated carboxylic acids that can be used include metal salts, amides, imides, esters, etc. of saturated or unsaturated carboxylic acids.

[0080] Also usable are thermoplastic resins modified with unsaturated carboxylic acids or their derivatives, as well as cellulose-based materials, lignocellulose-based materials, starch-based materials, and the like, which are modified with unsaturated carboxylic acids or their derivatives. The thermoplastic resin before modification used in the thermoplastic resin modified with unsaturated carboxylic acids or their derivatives is not particularly limited as long as it does not significantly impair the effects of the present invention, and specific examples include low-density polyethylene, ethylene-α-olefin copolymers, high-density polyethylene, polypropylene, propylene block copolymers, and propylene random copolymers. Of these, it is preferable that the resin is the same as the polypropylene resin (A) and / or the polypropylene resin (B).

[0081] These can be obtained by heating and mixing a thermoplastic resin or a cellulose-based material, a lignocellulose-based material, a starch-based material, or the like with an unsaturated carboxylic acid or its derivative, and a radical generator in the presence or absence of a solvent. The amount of unsaturated carboxylic acid or its derivative added is preferably 0.1 to 15 mass%, particularly preferably 1 to 10 mass%. As the compatibilizer used in the present invention, preferred are thermoplastic resins modified with unsaturated carboxylic acid or its derivatives, which are odorless and have low acidity, as well as cellulose-based materials, lignocellulose-based materials, starch-based materials, and the like modified with unsaturated carboxylic acid or its derivatives.

[0082] The polypropylene resin composition may contain, as optional components, various additives, such as nucleating agents, heat stabilizers, antioxidants, weather stabilizers, light stabilizers, ultraviolet absorbers, antistatic agents, slip agents, antiblocking agents, antifogging agents, neutralizing agents, metal deactivators, surfactants, compatibilizers, colorants, antibacterial and antifungal agents, flame retardants, plasticizers, dispersants, fillers, conductive agents, preservatives, fragrances, deodorants, insect repellents, elastomers, etc., as long as the effects of the present invention are not significantly impaired. Two or more of these optional components may be used in combination. In addition, these optional components may be blended into the polypropylene resin (A) or into the polypropylene resin (B), and two or more of each resin component may be used in combination.

[0083] The method for preparing the propylene resin composition of the present invention includes a method of mixing the powdered or pelletized polypropylene resin (A), polypropylene resin (B), biomass material (C) and other compounding agents used as necessary using a dry blend or Henschel mixer. Depending on the situation, the biomass material (C) and the polypropylene resin (A) and / or polypropylene resin (B) may be fixed in advance by a gelation method or the like. These may also be kneaded in a single-screw or twin-screw extruder or kneaded to have a high filler content to form a master batch, which is then diluted to the required concentration during molding.

[0084] The polypropylene resin composition of the present invention can be produced by mixing polypropylene resin (A), polypropylene resin (B) and biomass material (C), or polypropylene resin (A), polypropylene resin (B), biomass material (C) and thermoplastic elastomer (D) and optional components blended as necessary, or by heating and kneading them using a single screw extruder, a twin screw extruder, etc. The resin temperature for heating and kneading can be appropriately determined in the range of 100°C to 300°C, taking into consideration the load of kneading, the color and odor of the resin composition, etc.

[0085] The polypropylene resin composition of the present invention can be molded into a desired shape to produce various molded products by means of pressure molding, film molding, vacuum molding, extrusion molding, injection molding, etc. The molding temperature can be appropriately determined in the range of 100° C. to 300° C., taking into consideration the load of kneading, the color and odor of the resin composition, etc.

[0086] The polypropylene resin composition of the present invention can be effectively used as a material for various film and sheet materials, disposable molded products (for example, containers, pipes, timber, bars, artificial wood, trays, concrete panels, foams, etc.), furniture, building materials, automotive interior and exterior materials, chassis and housings for home appliances, civil engineering and construction materials, agricultural, dairy farming, and fishery materials, recreational materials, and sports materials.

[0087] The polypropylene resin composition of the present invention is also suitably used in the fields of electrical insulating materials, industrial parts and materials, building materials, etc., and is particularly suitable as a raw material for housing components, building materials, and home appliances. Specific examples include trays, tableware, speakers, bathroom unit floor pans, buckets, toilet seats, cabinets, stereo cabinets, baseboards, door materials, counter materials, window frames, soundproofing boards, shelves, civil engineering timber, pillars, structural materials, kitchen components, floors, bathrooms, underlayment boards, piano organ main boards, and building and ceiling materials.

[0088] According to the polypropylene resin composition of the present invention, it is possible to effectively dispose of a large amount of excess stock of agricultural products that are difficult to dispose of, and to reduce the amount of polypropylene resin produced from fossil fuels. Furthermore, since the molded product of the polypropylene resin composition of the present invention leaves charcoal as a residue even when incinerated after use, it contributes greatly to the conservation of the global environment, since it generates less combustion heat and carbon dioxide. Even when it is disposed of by landfill, it is environmentally friendly because the return rate to the soil is high. EXAMPLES

[0089] The present invention will be described in more detail below using examples, but the present invention is not limited to these examples.

[0090] 1. Evaluation method (1) Melting point (Tm) Measurement was performed using a differential scanning calorimeter DSC6200 manufactured by Seiko Corp. Approximately 5 mg of a sheet-shaped sample was packed in an aluminum pan, and the sample was heated from room temperature to 200°C at a heating rate of 100°C / min, held for 5 minutes, cooled to 40°C at 10°C / min, and then heated to 200°C at 10°C / min. The maximum melting peak temperature was determined as the melting point Tm (°C) from the melting calorimetry curve obtained when the sample was heated.

[0091] (2) Melt flow rate (MFR) The MFR of polypropylene resins (A) and (B) was measured at 230°C and a load of 2.16 kg in accordance with JIS K7210. The MFR of thermoplastic elastomer (D) was measured at 190°C and a load of 21.6 kg in accordance with JIS K6922-2. The unit is g / 10 min.

[0092] (3) Melt tension MT The measurement was carried out using a Capillograph manufactured by Toyo Seiki Seisakusho Co., Ltd. (Measurement conditions) Capillary: diameter 2.0mm, length 40mm Cylinder diameter: 9.55mm Cylinder extrusion speed: 20mm / min Take-up speed: 4.0m / min ·Temperature: 230℃ When the melt tension MT is extremely high, the resin may break at a take-up speed of 4.0 m / min. In such cases, the take-up speed is reduced by 0.1 m / min, and the melt tension at the highest possible take-up speed is taken as MT. The unit is grams.

[0093] (4) Q value (Mw / Mn) It was determined by GPC measurement according to the following method. Apparatus: Waters GPC (ALC / GPC 150C) Detector: FOXBORO MIRAN 1A IR detector (measurement wavelength: 3.42 μm) Column: Showa Denko AD806M / S (3 columns) Mobile phase solvent: Orthodichlorobenzene (ODCB) ·Measurement temperature: 140℃ ·Flow rate: 1.0ml / min ·Injection amount: 0.2ml Sample preparation: Prepare a 1 mg / mL solution of the sample using ODCB (containing 0.5 mg / mL BHT) and dissolve the sample at 140°C for approximately 1 hour. The conversion from the retention volume obtained by GPC measurement to the molecular weight is carried out using a calibration curve (calibration curve) prepared in advance using standard polystyrene. The following brands of standard polystyrene manufactured by Tosoh Corporation are used. F380, F288, F128, F80, F40, F20, F10, F4, F1, A5000, A2500, A1000

[0094] (5) Soluble matter below 40°C as measured by temperature rising elution fractionation (TREF) method The measurements were carried out according to the method described above.

[0095] (6) Pellet odor 100 g of the pellets were weighed out and placed in a 500 ml glass container, after which they were kept at 80° C. for 3 hours, after which the lid of the glass container was opened and the odor of the pellets inside was evaluated sensorily. The odor intensity was judged as follows: ◎: Almost no odor is detected. ○: Slight odor is felt. △: There is an unpleasant odor. ×: The odor is strong.

[0096] (7) Extrusion sheet moldings and their plastic parts The pellets were placed in an extruder with a screw diameter of 40 mm, extruded through a T-die at a resin temperature of 200°C, sandwiched between a mirror-finished metal casting roll with a surface temperature of 60°C, and continuously taken up at a speed of 1.2 m / min while being cooled and solidified, to obtain a sheet of polypropylene resin composition 500 mm wide and 1.0 mm thick. The plastic feel of the obtained molded body was evaluated based on the loss of gloss caused by the biomass material and the appearance of a pattern. The strength of the plastic feel was judged as follows. ○: Almost no plastic feel. △: Has a slightly plastic feel. ×: It feels just like plastic.

[0097] (8) Extrusion foam moldings and their plastics 100 parts by weight of pellets of polypropylene resin composition and 0.5 parts by weight of a chemical foaming agent (trade name: Hydrocerol CF40E-J, manufactured by Clariant Japan Co., Ltd.) as a cell regulator were uniformly mixed and stirred by a ribbon blender, and the resulting mixture was fed into a single-screw extruder having a barrel hole for injecting a physical foaming agent in the middle of the barrel. While the mixture was heated and melted in the front stage of the extruder to plasticize and decompose the cell regulator, 0.50 parts by weight of liquefied carbon dioxide was injected and kneaded with respect to 100 parts by weight of the polypropylene resin composition by a high-pressure pump, and then the polypropylene resin foam molding material was quickly cooled in the rear stage of the extruder and extruded from a T-shaped die with a width of 750 mm and a lip width of 0.4 mm. The extruded foam sheet was first cooled on one side by a roll installed immediately adjacent to the die, then cooled on both sides by three rolls installed thereafter, and taken up at a constant speed by a pinch roll to obtain a foam sheet with a thickness of 1.3 mm. The operating conditions of the extruder are as follows. Extruder Aperture: 65mmφ, L / D=42, Physical foaming agent injection port: L / D=20 position Screw rotation speed: 75 rpm Discharge amount: approx. 65kg / h The resulting plastic feeling was evaluated as described in (7) above.

[0098] (9) Injection molded products and their plastic parts Using a molding machine (Toshiba Machine EC20 injection molding machine) and the following mold, flat test pieces for evaluating physical properties were produced under the following conditions and used for evaluating the "tensile modulus" described below. Mold = 2 flat test pieces (10 x 80 x 4t (mm)) for evaluating physical properties. Molding conditions: Molding temperature 220℃, mold temperature 30℃, injection pressure 50MPa, injection time 5 seconds, cooling time 20 seconds. The resulting plastic feeling was evaluated as described in (7) above.

[0099] (10) Tensile modulus Using the flat test piece prepared in (9) above, in accordance with JIS K7162, The test specimens were prepared by machining. Measurement was performed at a test temperature of 23° C. The tensile modulus was judged to be high or low as follows. ○: Tensile modulus is 1,200 MPa or more ×: Tensile modulus is less than 1,200 MPa

[0100] 2. Raw Materials The raw materials used in the evaluation are as follows. The physical properties of the raw materials are summarized in Table 1. -Polypropylene resin (A-1): Novatec BC6C (product name) manufactured by Japan Polypropylene Corporation -Polypropylene resin (A-2): Novatec BC03C (product name) manufactured by Japan Polypropylene Corporation - Polypropylene resin (B-1): Wintech WFX6 (product name) manufactured by Japan Polypropylene Corporation - Polypropylene resin (B-2): Wintech WSX03 (product name) manufactured by Japan Polypropylene Corporation -Biomass material (C-1): wood flour (100 mesh), manufactured by Casino -Biomass material (C-2): wood flour (45 mesh), manufactured by Casino -Thermoplastic elastomer (D-1): Toughmer (registered trademark) manufactured by Mitsui Chemicals, Inc. A4050

[0101] [Table 1]

[0102] (Examples 1 to 12, Comparative Examples 1 to 5) Seventeen types of polypropylene resin compositions (Examples 1 to 12, Comparative Examples 1 to 5) shown in Tables 2 and 3 were weighed and uniformly mixed by stirring using a ribbon blender. The resulting mixture was fed into a twin-screw extruder with a screw diameter of 15 mm, kneaded at a resin temperature of 200°C, extruded into strands, cooled with water, and pelletized to obtain polypropylene resin compositions.

[0103] The obtained polypropylene resin composition was evaluated for pellet odor, extrusion sheet molded product (plastic feel), extrusion foam molded product (plastic feel), injection molded product (plastic feel), and strength by the above-mentioned methods. The evaluation results are summarized in Tables 2 and 3.

[0104] [Table 2]

[0105] [Table 3]

Claims

1. A polypropylene resin composition comprising 5 to 85 mass% of polypropylene resin (A) having a melting point of 150°C or higher, 5 to 85 mass% of polypropylene resin (B) having a melting point of 110°C or higher and 140°C or lower, and 10 to 80 mass% of a biomass material (C) (wherein the total mass of (A), (B) and (C) is 100 mass%), wherein the polypropylene resin (B) is one or more polypropylene resins selected from the group consisting of a propylene-ethylene random copolymer, a propylene-1-butene random copolymer, a propylene-ethylene-1-butene random copolymer, a propylene-ethylene random block copolymer and a propylene-ethylene-1-butene random block copolymer, and the biomass material (C) is one or more polypropylene resins selected from the group consisting of a cellulose-based material and a lignocellulosic material.

2. The polypropylene resin composition according to claim 1, wherein the polypropylene resin (A) is one or more polypropylene resins selected from the group consisting of propylene homopolymers, propylene-ethylene block copolymers, and propylene-ethylene-1-butene block copolymers.

3. The polypropylene resin composition according to claim 1 or 2, characterized in that the polypropylene resin (B) has the following property (b-1) and / or (b-2). (b-1) Q value is 5.0 or less (b-2) The content of soluble matter at 40° C. or less as measured by temperature rising elution fractionation (TREF) is 4.0% by mass or less.

4. The polypropylene resin composition according to any one of claims 1 to 3, characterized in that the biomass material (C) is one or more plant-derived fillers selected from the group consisting of wood, pulp, bamboo, bagasse, and rice husks.

5. The polypropylene resin composition according to any one of claims 1 to 4, further comprising 1 to 50 parts by mass of a thermoplastic elastomer (D) per 100 parts by mass consisting of a total of 100% by mass of the polypropylene resin (A), the polypropylene resin (B), and the biomass material (C).

6. 6. An extrusion foam molded product, an injection foam molded product, a sheet molded product, a thermoformed product, or a blow molded product comprising the polypropylene resin composition according to any one of claims 1 to 5.

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