RESIN COMPOSITION AND RESIN FORM PRODUCT

Abstract

Resin composition including: a cellulose acylate (A); and an aromatic compound (B) which does not contain a functional group that reacts with the cellulose acylate (A), but contains a long-chain aliphatic group having 6 or more and 30 or fewer carbon atoms, and contains at least one of a phenolic hydroxyl group and one of a monoglycidyl ether group directly bonded to an aromatic group of the aromatic compound (B), wherein the mass ratio (B) / (A) of the aromatic compound (B) to the cellulose acylate (A) is 0.15 or more, and wherein the solubility of the resin composition in methyl ethyl ketone is 200 mg / ml or more at a liquid temperature of 25 °C.

Description

General state of the artTechnical field

[0001] The present invention relates to a resin composition and a resin molded product. Related technology

[0002] JP 2000-309503 A discloses “a liquid or cream cosmetic containing 1.0 wt% to 40 wt% of cellulose fine particles and / or cellulose composite fine particles, which are fine particles having an average particle diameter of 0.2 µm to 20 µm and an L / D (L denotes a major axis of the cellulose particles or the composite particles, and D denotes a minor axis thereof) of 1.30 or less.”

[0003] JP 2018-118917 A discloses “an abrasive containing porous particles of cellulose having a particle diameter of 100 µm or more and 1,000 µm or less in average diameter, a specific bulk density of 0.38 g / ml or more and 0.55 g / ml or less, and a biodegradation rate within 10 days of 50 wt% or more.”

[0004] JP 2015-081326 A discloses “a cellulose-based resin obtained by using a hydroxy group of a cellulose or a derivative thereof and a phenolic hydroxy group of a cardanol derivative to bond a cardanol analogue or a derivative thereof, which have a cardanol and cardol content of 3.0 wt% or more, to the cellulose or the derivative thereof.”

[0005] DE 10 2019 103 414 A1 discloses a resin composition comprising a cellulose acylate (A), a cardanol compound (B) and a compound (C), wherein the compound is at least one selected from the group consisting of a hindered phenol compound, a tocopherol compound, a tocotrienol compound, a phosphite compound and a hydroxylamine compound. Brief description

[0006] An object of the present invention is to provide a resin composition from which a resin molded product having a high biodegradation rate can be obtained, as compared with a case where, in a resin composition comprising a cellulose acylate (A) and an aromatic compound (B) which does not contain a functional group reacting with the cellulose acylate (A) but contains a long-chain aliphatic group and at least one of a phenolic hydroxy group and a monoglycidyl ether group directly bonded to an aromatic group of the aromatic compound (B), a mass ratio (B) / (A) of the aromatic compound (B) to the cellulose acylate (A) is less than 0.15 or a solubility of the resin composition in methyl ethyl ketone is less than 200 mg / ml.

[0007] Provided according to one aspect of the present disclosure is [1] a resin composition comprising: a cellulose acylate (A); and an aromatic compound (B) which does not contain a functional group which reacts with the cellulose acylate (A), but contains a long-chain aliphatic group having 6 or more and 30 or fewer carbon atoms, and at least one of a phenolic hydroxy group and a monoglycidyl ether group which is directly bonded to an aromatic group of the aromatic compound (B), wherein a mass ratio (B) / (A) of the aromatic compound (B) to the cellulose acylate (A) is 0.15 or more and wherein a solubility of the resin composition in methyl ethyl ketone is 200 mg / ml or more at a liquid temperature of 25 °C. [2] The resin composition according to [1], wherein the mass ratio (B) / (A) of the aromatic compound (B) to the cellulose acylate (A) is 0.15 or more and 0.80 or less. [3] The resin composition according to [1] or [2], wherein the cellulose acylate (A) is at least one selected from the group consisting of cellulose acetate propionate and cellulose acetate butyrate. [4] The resin composition according to any one of [1] to [3], wherein the aromatic compound (B) is a cardanol compound (B1). [5] The resin composition according to [4], wherein the cardanol compound (B1) is at least one compound selected from the group consisting of a compound represented by the following general formula (CDN1) and a polymer obtained by polymerizing the compound represented by the general formula (CDN1). In the general formula (CDN1), R 1 an alkyl group which may have a substituent, or an unsaturated aliphatic group which has a double bond and may have a substituent. R 2represents a hydroxy group, a carboxy group, an alkyl group which may have a substituent, or an unsaturated aliphatic group which has a double bond and may have a substituent. P2 represents an integer of 0 or more and 4 or less. When P2 is 2 or more, plural R 2 represent the same group or different groups. [6] A resin molded product comprising the resin composition according to any one of [1] to [5]. [7] The resin molded product according to [6], which is a granular material. [8] The resin molded product according to [7], in which a volume-average particle diameter of the granular material is 3 µm or more and 100 µm or less. [9] The resin molded product according to [7] or [8], in which a particle size distribution index GSDv of the large diameter side of the granular material is 1.5 or less.

[0008] According to the exemplary embodiments of the inventions of [1], [4] and [5], it is possible to provide a resin composition from which a resin molded product having a high biodegradation rate can be obtained, as compared with a case where, in a resin composition comprising a cellulose acylate (A) and an aromatic compound (B) that does not contain a functional group that reacts with the cellulose acylate (A) but contains a long-chain aliphatic group and at least one of a phenolic hydroxy group and a monoglycidyl ether group directly bonded to an aromatic group of the aromatic compound (B), a mass ratio (B) / (A) of the aromatic compound (B) to the cellulose acylate (A) is less than 0.15 and a solubility of the resin composition in methyl ethyl ketone is less than 200 mg / ml.

[0009] According to an exemplary embodiment of the invention according to [2], it is possible to provide a resin composition from which a resin molded product can be obtained whose excessive biodegradation rate is suppressed, as compared with a case where the mass ratio (B) / (A) of the aromatic compound (B) to the cellulose acylate (A) is less than 0.15, or a resin molded product having a high biodegradation rate, as compared with a case where the mass ratio (B) / (A) of the aromatic compound (B) to the cellulose acylate (A) is more than 0.80.

[0010] According to an exemplary embodiment of the invention according to [3], it is possible to provide a resin composition from which a resin molded product having a high biodegradation rate can be obtained, as compared with a case where the cellulose acylate (A) is diacetylcellulose or triacetylcellulose.

[0011] According to an exemplary embodiment of the invention according to [6] or [7], it is possible to provide a resin molded product having a high biodegradation rate, as compared with a case where, in a resin composition comprising a cellulose acylate (A) and an aromatic compound (B) which does not contain a functional group reacting with the cellulose acylate (A) but contains a long-chain aliphatic group and at least one of a phenolic hydroxy group and a monoglycidyl ether group directly bonded to an aromatic group of the aromatic compound (B), a mass ratio (B) / (A) of the aromatic compound (B) to the cellulose acylate (A) is less than 0.15 or a solubility of the resin composition in methyl ethyl ketone is less than 200 mg / ml.

[0012] According to an exemplary embodiment of the invention according to [8], it is possible to provide, as a resin molded product, a granular material having a high biodegradation rate, as compared with a case of a granular material having a volume-average particle diameter of less than 3 µm or more than 100 µm.

[0013] According to an exemplary embodiment of the invention according to [9], it is possible to provide, as a resin molded product, a granular material having a high biodegradation rate, as compared with a case of a granular material having a particle size distribution index GSDv of the large diameter side of more than 1.5. Detailed description

[0014] An exemplary embodiment is described below as an example of the present invention. The descriptions and examples illustrate the exemplary embodiments and do not limit the scope of the exemplary embodiments.

[0015] In the numerical ranges described in stages in this specification, an upper limit or lower limit described in one numerical range may be replaced by an upper limit or lower limit of the numerical range described in other stages. Furthermore, in the numerical ranges described in this specification, the upper limit or lower limit of the numerical range may be replaced by the values ​​shown in the examples.

[0016] In this description, the term "step" does not only refer to a stand-alone step, and even if a step cannot be clearly distinguished from other steps, that step is included in the term "step" as long as the intended purpose of the step is achieved.

[0017] Each component may include several of the corresponding substances.

[0018] When reference is made to the amount of each component in the composition, unless otherwise stated, this refers to the total amount of the multiple substances present in the composition when there are multiple substances corresponding to each of the components in the composition.

[0019] The term “(meth)acrylic” means at least one of acrylic and methacrylic and “(meth)acrylate” means at least one of acrylate and methacrylate.

[0020] In this specification, a cellulose acylate (A) and an aromatic compound (B) are also referred to as component (A) and component (B), respectively. <harzzusammensetzung>-First exemplary embodiment-

[0021] The resin composition according to the first exemplary embodiment comprises a cellulose acylate (A) and an aromatic compound (B) which does not contain a functional group that reacts with the cellulose acylate (A) but contains a long-chain aliphatic group and at least one of a phenolic hydroxy group and a monoglycidyl ether group directly bonded to an aromatic group of the aromatic compound (B).

[0022] A mass ratio (B) / (A) of the aromatic compound (B) to the cellulose acylate (A) is 0.15 or more.

[0023] In recent years, resin compositions containing biologically derived components instead of petroleum have been widely used with a view to building a sustainable society, preventing global warming and conserving depleted resources.

[0024] In particular, environmental pollution and destruction of biological systems due to plastic waste discharged into the ocean have occurred, so there is a demand for a bio-derived and biodegradable resin molded product.

[0025] On the other hand, many biodegradable resin molding products such as cellulose and polylactic acid are reported.

[0026] However, the biodegradable resin molded products all have insufficient biodegradation rate and long life in the environment, are eaten by organisms before decomposition, and are easily eaten by organisms due to their reduced shape due to decomposition.

[0027] In response, a resin molded product with high biodegradability having the above configuration can be obtained from the resin composition according to the first exemplary embodiment. The reasons for this are assumed to be as follows.

[0028] Cellulose acylate (A) (component (A)) is a biodegradable compound. In this mechanism, the molecular chain initially shortens through hydrolysis of component (A). When the molecular chain reaches a certain length, biodegradation by microorganisms begins, and component (A) ultimately forms water, carbon dioxide, and acid.

[0029] It takes time for the molecular chain of component (A) to hydrolyze to a biodegradable length. This is one of the factors that slows the rate of biodegradation.

[0030] Furthermore, since the hydrolysis of component (A) occurs randomly, the decomposition results in a distribution of long and short chains, with the short chains biodegrading relatively quickly, while the long chains remain. This also makes it impossible to increase the rate of biodegradation.

[0031] On the other hand, when the resin composition containing the cellulose acylate (A) (component (A)) and the aromatic compound (B) (component (B)) is exposed to moderate temperature and humidity such as in compost or an alkaline atmosphere and humidity such as in seawater, the monoglycidyl ether group or phenolic hydroxy group (hereinafter also referred to as "epoxide group or hydroxy group") of component (B) has a weak binding force and increased activity because component (B) has a relatively long-chain aliphatic group. Therefore, the hydrolysis of component (A) is promoted.

[0032] In addition, when the mass ratio (B) / (A) of component (B) to component (A) is 0.15 or more, the effect of promoting the hydrolysis of component (A) by the epoxy group or hydroxy group of the aromatic compound (B) is increased and the biodegradation rate of the obtained resin molded product is increased.

[0033] In response to the above, it is believed that a resin molded product with high biodegradability having the above configuration can be obtained from the resin composition according to the first exemplary embodiment. -Second exemplary embodiment-

[0034] The resin composition according to the second exemplary embodiment comprises a cellulose acylate (A) and an aromatic compound (B) which does not contain a functional group that reacts with the cellulose acylate (A) but contains a long-chain aliphatic group and at least one of a phenolic hydroxy group and a monoglycidyl ether group directly bonded to an aromatic group of the aromatic compound (B).

[0035] The solubility of the resin composition in methyl ethyl ketone at a liquid temperature of 25 °C is 200 mg / ml or more.

[0036] From the resin composition according to the second exemplary embodiment, a resin molded product with high biodegradability having the above configuration can be obtained. The reasons for this are assumed to be as follows.

[0037] The cellulose acylate (A) is sparingly soluble in methyl ethyl ketone alone. On the other hand, the resin composition in which the aromatic compound (B) is mixed with the cellulose acylate (A) exhibits increased solubility in methyl ethyl ketone.

[0038] When the solubility of the resin composition in methyl ethyl ketone is 200 mg / ml or more at a liquid temperature of 25°C, the intermolecular force of the cellulose acylate (A) weakens, and the aromatic compound (B) easily mixes between the molecules of the cellulose acylate (A). Therefore, as described above, the effect of promoting the hydrolysis of component (A) by the epoxy group or hydroxy group of the aromatic compound (B) increases, and the biodegradation rate of the resulting resin molded product is increased.

[0039] From the above, it is believed that a resin molded product with high biodegradability having the above configuration can be obtained from the resin composition according to the second exemplary embodiment.

[0040] Hereinafter, the resin composition (hereinafter also referred to as "the resin composition according to the present exemplary embodiment") corresponding to both the resin compositions according to the first and second exemplary embodiments will be described in detail. However, an example of a toner of the present invention may be any toner corresponding to any of the resin compositions according to the first and second exemplary embodiments.

[0041] The resin composition according to the present exemplary embodiment will be described in detail below. [Cellulose acylate (A): Component (A)]

[0042] Cellulose acylate (A) is a cellulose derivative in which at least a portion of the hydroxy group in the cellulose is substituted (acylated) by an acyl group. The acyl group is a group having a structure -CO-R AC has. R AC represents a hydrogen atom or a hydrocarbon group.

[0043] For example, cellulose acylate (A) is a cellulose derivative of the following general formula (CA).

[0044] In the general formula (CA) A 1 , A 2 and A 3 each independently represents a hydrogen atom or an acyl group and n represents an integer of 2 or higher. However, at least a part of the n A 1 , n / a 2 and n A 3 an acyl group. All the n A 1 in the molecule can be the same, partially the same, or different from each other. Similarly, the n A 2 and n A 3 in the molecule be the same, partially the same or different from each other.

[0045] In the acyl group, represented by A 1 , A 2 and A 3 , the hydrocarbon group in the acyl group may be linear, branched or cyclic and is preferably linear or branched and more preferably linear.

[0046] In the acyl group, represented by A 1 , A 2 and A 3 , the hydrocarbon group in the acyl group may be a saturated hydrocarbon group or an unsaturated hydrocarbon group, and more preferably a saturated hydrocarbon group.

[0047] The acyl group, represented by A 1 , A 2 and A 3 , is preferably an acyl group having 1 or more and 6 or fewer carbon atoms. That is, the cellulose acylate (A) is preferably a cellulose acylate (A) containing an acyl group having 1 or more and 6 or fewer carbon atoms. A resin molded product with excellent impact resistance is easier to obtain when the cellulose acylate (A) contains an acyl group having 1 or more and 6 or fewer carbon atoms than when a cellulose acylate (A) contains an acyl group having 7 or more carbon atoms.

[0048] The acyl group, represented by A 1 , A 2 and A 3 , may be a group in which a hydrogen atom in the acyl group is substituted by a halogen atom (e.g., a fluorine atom, a bromine atom, and an iodine atom), an oxygen atom, a nitrogen atom, or the like, and is preferably unsubstituted.

[0049] Examples of the acyl group represented by A 1 , A 2 and A 3 , include a formyl group, an acetyl group, a propionyl group, a butyryl group (a butanoyl group), a propenoyl group, and a hexanoyl group. Of these, the acyl group is preferably an acyl group having 2 or more and 4 or less carbon atoms, and more preferably an acyl group having 2 or 3 carbon atoms from the viewpoints of the moldability of the resin composition and improving the biodegradation rate of the resin molded product.

[0050] Examples of the cellulose acylate (A) include cellulose acetate (cellulose monoacetate, cellulose diacetate (DAC) and cellulose triacetate), cellulose acetate propionate (CAP) and cellulose acetate butyrate (CAB).

[0051] From the viewpoint of improving the biodegradation rate of the resin molded product, the cellulose acetate (A) is preferably cellulose acetate propionate (CAP) or cellulose acetate butyrate (CAB), and more preferably cellulose acetate propionate (CAP).

[0052] The cellulose acylate (A) can be used alone or in combination with two or more of them.

[0053] The weight-average polymerization degree of the cellulose acylate (A) is preferably 200 or more and 1,000 or less, more preferably 500 or more and 1,000 or less, and still more preferably 600 or more and 1,000 or less from the viewpoint of the moldability of the resin composition, the impact resistance of the resin molded product, or the excellent toughness of the resin molded product.

[0054] The weight-average degree of polymerization of the cellulose acylate (A) is determined based on the weight-average molecular weight (Mw) by the following method.

[0055] First, the weight-average molecular weight (Mw) of cellulose acylate (A) based on polystyrene is measured with a gel permeation chromatography apparatus (GPC apparatus: HLC-8320GPC manufactured by Tosoh Corporation, column: TSK-Gel α-M) using tetrahydrofuran.

[0056] Next, the degree of polymerization of the cellulose acylate (A) is determined by dividing it by the molecular weight of the structural unit of the cellulose acylate (A). For example, in a case where a substituent of the cellulose acylate is an acetyl group, the molecular weight of the structural unit is 263 for a degree of substitution of 2.4 and 284 for a degree of substitution of 2.9.

[0057] The weight-average degree of substitution of the cellulose acylate (A) is preferably 2.1 or more and 2.9 or less, more preferably 2.2 or more and 2.9 or less, still more preferably 2.3 or more and 2.9 or less, and particularly preferably 2.6 or more and 2.9 or less from the viewpoints of the moldability of the resin composition and the improvement of the biodegradation rate of the resin molded product.

[0058] In the cellulose acetate propionate (CAP), the ratio of the degrees of substitution of the acetyl group to the propionyl group (acetyl group / propionyl group) is preferably 0.01 or more and 1 or less, and is more preferably 0.05 or more and 0.1 or less, from the viewpoints of the moldability of the resin composition and the improvement of the biodegradation rate of the resin molded product.

[0059] In the cellulose acetate butyrate (CAB), the ratio of the degrees of substitution of the acetyl group to the butyryl group (acetyl group / butyryl group) is preferably 0.05 or more and 3.5 or less, and is more preferably 0.5 or more and 3.0 or less from the viewpoints of the moldability of the resin composition and the improvement of the biodegradation rate of the resin molded product.

[0060] The degree of substitution of cellulose acylate (A) is an index indicating the degree to which hydroxy groups of cellulose are substituted by an acyl group. That is, the degree of substitution is an index indicating the degree of acylation of cellulose acylate (A).

[0061] In particular, the degree of substitution refers to an intramolecular average of the number of substitutions where three hydroxy groups in a D-glucopyranose unit of the cellulose acylate (A) are substituted by an acyl group. The degree of substitution is calculated from the ratio of the peak integral of a hydrogen originating from cellulose to the peak integral of a hydrogen originating from an acyl group using 1 H-NMR (JMN-ECA, manufactured by JEOL RESONANCE Co., Ltd.). [Aromatic compound (B): component (B)]

[0062] The aromatic compound (B) is an aromatic compound which does not contain a functional group which reacts with the cellulose acylate (A), but contains a long-chain aliphatic group and at least one of a phenolic hydroxy group and a monoglycidyl ether group which is directly bonded to an aromatic group of the aromatic compound (B).

[0063] That is, the aromatic compound (B) is a compound that does not contain a functional group that reacts with the cellulose acylate (A), but contains a long-chain aliphatic group and at least one of a phenolic hydroxy group and a monoglycidyl ether group.

[0064] Examples of the long-chain aliphatic group here include a saturated aliphatic group (e.g., alkyl group) and an unsaturated aliphatic group (e.g., alkenyl group or alkynyl group) having 6 or more and 30 or fewer carbon atoms, preferably 10 or more and 20 or fewer carbon atoms. The aliphatic group may be linear, branched, or cyclic, and is preferably linear or branched, and more preferably linear.

[0065] Examples of the aromatic compound (B) include a compound in which a phenolic hydroxy group is substituted on a monocyclic ring, a condensed ring which is a polycyclic ring having two or more aromatic rings, a polynuclear ring which is a polycyclic ring in which aromatic rings are connected by a carbon-carbon bond, or a heterocyclic ring which is a monocyclic ring of a heterocyclic ring, a condensed ring containing a heterocyclic ring, a polynuclear ring containing a heterocyclic ring, etc., together with a long-chain aliphatic group.

[0066] Specific examples of the aromatic compound (B) include a cardanol compound, a phenalkamine compound, a phenol resin, a phenol novolak epoxy resin, a phenol resole epoxy resin, phenol-modified palm oil, phenol-modified soybean oil, and phenol-modified linseed oil.

[0067] Among them, the cardanol compound (B1) is preferred as the aromatic compound (B) from the viewpoint of improving biodegradability.

[0068] The cardanol compound (B1) refers to a component (for example, compounds represented by the following structural formulas (b-1) to (b-4)) contained in a compound naturally obtained from cashew nuts or a derivative of the component.

[0069] The cardanol compound (B1) may be a mixture of naturally derived compounds from cashew nuts (hereinafter also referred to as "cashew nut derived mixture").

[0070] The cardanol compound (B1) can be a derivative of the cashew-derived mixture. Examples of the derivative of the cashew-derived mixture include the following mixtures and pure substances. • A mixture obtained by adjusting the compositional ratios of each component in the mixture obtained from cashew nut. • A pure substance obtained by isolating only one specific component from the mixture obtained from cashew nut. • A mixture containing a modified product obtained by modifying a component in the cashew nut derived mixture. • A mixture containing a polymer obtained by polymerizing a component in the cashew nut-derived mixture. • A blend containing a modified polymer obtained by modifying and polymerizing a component in the cashew nut-derived blend. • A mixture containing a modified product obtained by further modifying a component in the mixture whose composition ratio is adjusted. • A mixture containing a polymer obtained by further polymerizing a component in the mixture whose composition ratio is adjusted. • A mixture containing a modified polymer obtained by further modification and polymerization of a component in the mixture whose composition ratio is adjusted. • A modified product obtained by further modification of the isolated pure substance. • A polymer obtained by further polymerization of the isolated pure substance. • A modified polymer obtained by further modification and polymerization of the isolated pure substance.

[0071] Here, a pure substance comprises a multimer such as a dimer or a trimer.

[0072] The cardanol compound (B1) is preferably at least one compound selected from the group consisting of a compound of the general formula (CDN1) and a polymer obtained by polymerizing the compound of the general formula (CDN1) from the viewpoint of improving the biodegradation rate of the resin molded product.

[0073] In the general formula (CDN1), R 1 an alkyl group which may have a substituent, or an unsaturated aliphatic group which has a double bond and may have a substituent. R 2 represents a hydroxy group, a carboxy group, an alkyl group which may have a substituent, or an unsaturated aliphatic group which has a double bond and may have a substituent. P2 represents an integer of 0 or more and 4 or less. When P2 is 2 or more, plural R 2 represent the same group or different groups.

[0074] In the general formula (CDN1), the alkyl group containing a substituent represented by R 1 may have an alkyl group having 6 or more and 30 or fewer carbon atoms, preferably an alkyl group having 6 or more and 25 or fewer carbon atoms, and more preferably an alkyl group having 8 or more and 20 or fewer carbon atoms.

[0075] Examples of the substituent include: a hydroxy group; a substituent containing an ether bond such as an epoxy group and a methoxy group; and a substituent containing an ester bond such as an acetyl group and a propionyl group.

[0076] Examples of the alkyl group which may have a substituent include a pentadecan-1-yl group, a heptan-1-yl group, an octan-1-yl group, a nonan-1-yl group, a decan-1-yl group, an undecan-1-yl group, a dodecan-1-yl group and a tetradecan-1-yl group.

[0077] In the general formula (CDN1), the unsaturated aliphatic group having a double bond and a substituent is represented by R 1 may have an unsaturated aliphatic group having 6 or more and 30 or fewer carbon atoms, preferably an unsaturated aliphatic group having 6 or more and 25 or fewer carbon atoms, and more preferably an unsaturated aliphatic group having 8 or more and 20 or fewer carbon atoms.

[0078] The number of double bonds in the unsaturated aliphatic group is preferably 1 or more and 3 or less.

[0079] Examples of the substituent also include those listed above as the substituent of the alkyl group.

[0080] Examples of the unsaturated aliphatic group which has a double bond and may have a substituent include a pentadeca-8-en-1-yl group, a pentadeca-8,11-dien-1-yl group, a pentadeca-8,11,14-trien-1-yl group, a pentadeca-7-en-1-yl group, a pentadeca-7,10-dien-1-yl group and a pentadeca-7,10,14-trien-1-yl group.

[0081] In the general formula (CDN1) R 1 preferably a pentadeca-8-en-1-yl group, a pentadeca-8,11-dien-1-yl group, a pentadeca-8,11,14-trien-1-yl group, a pentadeca-7-en-1-yl group, a pentadeca-7,10-dien-1-yl group and a pentadeca-7,10,14-trien-1-yl group.

[0082] In the general formula (CDN1), preferred examples of the alkyl group which may have a substituent and the unsaturated aliphatic group which has a double bond and a substituent represented by R 2 those listed above as the alkyl group which may have a substituent, and the unsaturated aliphatic group which has a double bond and a substituent represented by R 1 can have.

[0083] The compound of general formula (CDN1) can be further modified. For example, the compound of general formula (CDN1) can be epoxidized. In particular, the compound of general formula (CDN1) can be a compound having a structure in which a hydroxy group of the compound of general formula (CDN1) is replaced by the subsequent group (EP), that is, a compound of the following general formula (CDN1-e).

[0084] In the group (EP) and in the general formula (CDN1-e) L EP a single bond or a divalent linking group. In the general formula (CDN1-e), R 1 , R 2 and P2 each have the same meanings as R 1 , R 2 or P2 in the general formula (CDN1).

[0085] In the group (EP) and in the general formula (CDN1-e), examples of the divalent compound group represented by L include EP an alkylene group which may have a substituent (preferably an alkylene group having 1 or more and 4 or less carbon atoms, and more preferably an alkylene group having 1 carbon atom), and a -CH2CH2OCH2CH2- group.

[0086] Examples of the substituent also include those mentioned above as the substituent of R 1 listed in the general formula (CDN1).

[0087] L EP is preferably a methylene group.

[0088] The polymer obtained by polymerizing the compound of the general formula (CDN1) refers to a polymer obtained by polymerizing at least two or more compounds of the general formula (CDN1) with or without a linking group.

[0089] Examples of the polymer obtained by polymerizing the compound of the general formula (CDN1) include a compound of the following general formula (CDN2).

[0090] In the general formula (CDN2) R 11 , R 12 and R 13 each independently represents an alkyl group which may have a substituent, or an unsaturated aliphatic group which has a double bond and may have a substituent. R 21 , R 22 and R 23 each independently represents a hydroxy group, a carboxy group, an alkyl group which may have a substituent, or an unsaturated aliphatic group which has a double bond and may have a substituent. P21 and P23 each independently represent an integer of 0 or more and 3 or less, and P22 represents an integer of 0 or more and 2 or less. L 1 and L 2 each independently represents a divalent linking group. n represents an integer of 0 or more and 10 or less. When P21 is 2 or more, multiple R 21 the same group or different groups; if P22 is 2 or more, several R 22 the same group or different groups; and if P23 is 2 or more, several R 23 the same group or different groups. If n is 2 or more, multiple R 12 , R 22 and L 1 each be the same group or different groups; and when n is 2 or more, multiple P22 may be the same number or different numbers.

[0091] In the general formula (CDN2), preferred examples of the alkyl group which may have a substituent and the unsaturated aliphatic group which has a double bond and a substituent represented by R include 11 , R 12 , R 13 , R 21 , R 22 and R 23 may include those referred to above as R 1 listed in the general formula (CDN1).

[0092] In the general formula (CDN2), examples of the divalent linking group represented by L include 1 and L 2 an alkylene group which may have a substituent (preferably an alkylene group having 2 or more and 30 or fewer carbon atoms, and more preferably an alkylene group having 5 or more and 20 or fewer carbon atoms).

[0093] Examples of the substituent also include those mentioned above as the substituent of R 1 listed in the general formula (CDN1).

[0094] In the general formula (CDN2), n preferably represents 1 or more and 10, and more preferably 1 or more and 5 or less.

[0095] The compound of general formula (CDN2) can be further modified. For example, the compound of general formula (CDN2) can be epoxidized. In particular, the compound of general formula (CDN2) can be a compound having a structure in which a hydroxy group of the compound of general formula (CDN2) is replaced by the group (EP), that is, a compound of the following general formula (CDN2-e).

[0096] In the general formula (CDN2-e) R 11 , R 12 , R 13 , R 21 , R 22 , R 23 , P21, P22, P23, L 1 , L 2 and n have the same meanings as R 11 , R 12 , R 13 , R 21 , R 22 , R 23 , P21, P22, P23, L 1 , L 2 or n in the general formula (CDN2).

[0097] In the general formula (CDN2-e), L EP1 , L EP2 , and L EP3 each independently represents a single bond or a divalent linking group. When n is 2 or more, multiple L EP2 be the same group or different groups.

[0098] In the general formula (CDN2-e), preferred examples of the divalent linking group represented by L include EP1 , L EP2 and L EP3 those described above as the divalent linking group represented by L EP are listed in the general formula (CDN1-e).

[0099] The polymer obtained by polymerizing the compound of the general formula (CDN1) may, for example, be a polymer obtained by three-dimensional cross-polymerization of at least three or more compounds of the general formula (CDN1) with or without a linking group. Examples of the polymer obtained by three-dimensional cross-polymerization of the compound of the general formula (CDN1) include a compound represented by the following structural formula.

[0100] In the above structural formula, R 10 , R 20 and P20 each have the same meanings as R 1 , R 2 and P2 in the general formula (CDN1). L 10 represents a single bond or a divalent linking group. Several R 10 , R 20 and L 10 can each independently be the same group or different groups. Multiple P20s can have the same number or different numbers.

[0101] In the above structural formula, examples of the divalent linking group represented by L include 10 , an alkylene group which may have a substituent (preferably an alkylene group having 2 or more and 30 or less carbon atoms, and more preferably an alkylene group having 5 or more and 20 or less carbon atoms).

[0102] Examples of the substituent also include those mentioned above as the substituent of R 1 listed in the general formula (CDN1).

[0103] The compound represented by the above-described structural formula can be further modified and can be, for example, epoxidized. Specifically, the compound represented by the above-described structural formula can be a compound in which a hydroxy group of the compound of the above-described structural formula is substituted by the group (EP), for example, a compound represented by the following structural formula, that is, a polymer obtained by three-dimensional cross-polymerization of the compound of the general formula (CDN1-e).

[0104] In the above structural formula, R 10 , R 20 and P20 each have the same meanings as R 1 , R 2 and P2 in the general formula (CDN1-e). L 10 represents a single bond or a divalent linking group. Several R 10 , R 20 and L 10 can each independently be the same group or different groups. Multiple P20s can have the same number or different numbers.

[0105] In the above structural formula, examples of the divalent linking group represented by L include 10 an alkylene group which may have a substituent (preferably an alkylene group having 2 or more and 30 or fewer carbon atoms, and more preferably an alkylene group having 5 or more and 20 or fewer carbon atoms).

[0106] Examples of the substituent also include those mentioned above as the substituent of R 1 listed in the general formula (CDN1).

[0107] The cardanol compound (B1) preferably includes the cardanol compound (B1) having an epoxy group, and is more preferably the cardanol compound (B1) having an epoxy group from the viewpoint of improving the transparency of the resin molded product.

[0108] A commercially available product can be used as the cardanol compound (B1). Examples of the commercially available product include NX-2024, Ultra LITE 2023, NX-2026, GX-2503, NC-510, LITE 2020, NX-9001, NX-9004, NX-9007, NX-9008, NX-9201, and NX-9203 manufactured by Cardolite Corporation, and LB-7000, LB-7250, and CD-5L manufactured by Tohoku Chemical Industries, Ltd. Examples of the commercially available product of the cardanol compound having an epoxy group include NC-513, NC-514S, NC-547, LITE 513E, and Ultra LTE 513 manufactured by Cardolite Corporation.

[0109] The hydroxyl value of the cardanol compound (B1) is preferably 100 mgKOH / g or more, more preferably 120 mgKOH / g or more, and even more preferably 150 mgKOH / g or more, from the perspective of improving the biodegradation rate of the resin molded product. The hydroxyl value of the cardanol compound (B1) is measured according to the method of ISO 14900.

[0110] When using the cardanol compound (B1) having an epoxy group as the cardanol compound (B1), its epoxy equivalent is preferably 300 or more and 500 or less, more preferably 350 or more and 480 or less, and even more preferably 400 or more and 470 or less, from the viewpoint of improving the transparency of the resin molded product. The epoxy equivalent of the cardanol compound (B1) having an epoxy group is determined according to ISO 3001.

[0111] The molecular weight of the cardanol compound (B1) is preferably 250 or more and 1,000 or less, more preferably 280 or more and 800 or less, still more preferably 300 or more and 500 or less from the viewpoint of improving the degradation rate of the resin molded product.

[0112] The cardanol compound (B1) can be used alone or in combination with two or more of them. [Contents of component (A) and component (B) and their mass ratio]

[0113] The abbreviations of the individual components are as follows. Component (A) = cellulose acylate (A) Component (B) = aromatic compound (B)

[0114] The mass ratio (B) / (A) of component (B) to component (A) is 0.15 or more.

[0115] If the mass ratio (B) / (A) is less than 0.15, the effect of hydrolysis of component (A) by component (B) is insufficient, and a high biodegradation rate cannot be achieved.

[0116] However, if the mass ratio (B) / (A) is excessively large even in a normal environment, such as before transfer to a compost bin or before discharge into seawater, hydrolysis of component (A) may occur, and the shelf life of the resin molded product during use may be reduced. Therefore, from the perspective of preventing excessive biodegradation, the mass ratio (B) / (A) is preferably 0.80 or less.

[0117] From the viewpoint of improving the biodegradation rate and at the same time imparting durability during use of the resin molded product, the mass ratio (B) / (A) is preferably 0.15 or more and 0.80 or less, and more preferably 0.20 or more and 0.50 or less.

[0118] From the viewpoint of improving the biodegradation rate, component (A) and component (B) are preferably included as main components.

[0119] Here, "component (A) and component (B) are the main components" means that the total amount of component (A) and component (B) constitutes the largest proportion of the entire resin composition.

[0120] Specifically, the total amount of component (A) and component (B) is 50 mass% or more, 60 mass% or more, 70 mass% or more, 80 mass% or more, 90 mass% or more, 95 mass% or 100 mass% based on the entire resin composition. [Other components]

[0121] The resin composition according to the present exemplary embodiment may contain other components.

[0122] Examples of other components include: a plasticizer, a flame retardant, a compatibilizer, a release agent, a lightfastness agent, a weathering agent, a colorant, a pigment, a modifier, an anti-drip agent, an antistatic agent, a hydrolysis inhibitor, a filler, a reinforcing agent (such as glass fiber, carbon fiber, talc, clay, mica, glass flakes, ground glass, glass beads, crystalline silica, alumina), silicon nitride, aluminum nitride, boron nitride, etc.), an acid acceptor to prevent the release of acetic acid (oxides such as magnesium oxide and aluminum oxide; metal hydroxides such as magnesium hydroxide, calcium hydroxide, aluminum hydroxide, and hydrotalcite; calcium carbonate; talc, etc.), a reactive scavenger (such as an epoxy compound, an acid anhydride compound, and carbodiimides, etc.)

[0123] The proportion of the other components is preferably 0 mass% or more and 5 mass% or less based on the total amount of the resin composition. Here, "0 mass% by mass" means that other components are not included in the resin composition.

[0124] Examples of the plasticizer include an ester compound, camphor, metallic soap, polyol, and polyalkylene oxide. The plasticizer is preferably an ester compound from the perspective of the impact resistance of the resin molded product. The plasticizer can be used alone or in combination with two or more of them.

[0125] Examples of the ester compound contained as a plasticizer in the resin composition of the present exemplary embodiment include adipates, citrates, sebacates, azelates, phthalates, acetates, dibasic acid esters, phosphates, condensed phosphates, glycol esters (e.g., glycerol zoate), and modified fatty acid esters (e.g., epoxidized fatty acid esters). Examples of the above esters include a monoester, a diester, a triester, and a polyester. Among these, dicarboxylic acid diesters (adipic acid diesters, sebacic acid diesters, azelaic acid diesters, phthalic acid diesters, etc.) are preferred.

[0126] The plasticizer is preferably an adipate ester. The adipate ester exhibits a high affinity for the cellulose acylate (A) and is dispersed in the cellulose acylate (A) in a nearly homogeneous state, thus improving thermal flowability more than other plasticizers.

[0127] A mixture of the adipate ester and other components can be used as the adipate ester. Examples of commercially available products of the mixture include Daifatty 101, manufactured by DAIHACHI CHEMICAL INDUSTRY CO., LTD.

[0128] Examples of fatty acid esters such as citrates, sebacates, azelates, phthalates, and acetates include an ester of a fatty acid and an alcohol. Examples of the alcohol include monohydric alcohols such as methanol, ethanol, propanol, butanol, and 2-ethylhexanol; polyhydric alcohols such as glycerin, polyglycerin (such as diglycerin), pentaerythritol, ethylene glycol, diethylene glycol, propylene glycol, butylene glycol, trimethylolpropane, trimethylolethane, and a sugar alcohol.

[0129] Examples of the glycol in the glycerol zoate include ethylene glycol, diethylene glycol and propylene glycol.

[0130] An epoxidized fatty acid ester is an ester compound having a structure (i.e., oxacyclopropane) in which an unsaturated carbon-carbon bond of an unsaturated fatty acid ester is epoxidized. Examples of the epoxidized fatty acid ester include an ester of a fatty acid and an alcohol in which some or all of the unsaturated carbon-carbon bonds in the unsaturated fatty acids (e.g., oleic acid, palmitoleic acid, vaccenic acid, linoleic acid, linolenic acid, and nervonic acid) are epoxidized. Examples of the alcohol include monohydric alcohols such as methanol, ethanol, propanol, butanol, and 2-ethylhexanol; polyhydric alcohols such as glycerin, polyglycerol (such as diglycerin), pentaerythritol, ethylene glycol, diethylene glycol, propylene glycol, butylene glycol, trimethylolpropane, trimethylolethane, and a sugar alcohol.

[0131] The ester compound contained as a plasticizer in the resin composition according to the present exemplary embodiment preferably has a molecular weight (or weight-average molecular weight) of 200 or more and 2000 or less, more preferably 250 or more and 1500 or less, and even more preferably 280 or more and 1000 or less. The weight-average molecular weight of the ester compound is a value measured by the method for measuring the weight-average molecular weight of cellulose acylate (A) unless otherwise specified.

[0132] The resin composition according to the present exemplary embodiment may contain a resin other than component (A), component (B), component (C), and component (D). However, when other resins are contained, the proportion of the other resins based on the total amount of the resin composition is preferably 5 mass% or less, and more preferably less than 1 mass%. Even more preferable is that no other resins are contained in the resin composition (i.e., 0 mass%).

[0133] Examples of other resins include conventionally known thermoplastic resins. Specific examples thereof include: a polycarbonate resin; a polypropylene resin; a polyester resin; a polyolefin resin; a polyester carbonate resin; a polyphenylene ether resin; a polyphenylene sulfide resin; a polysulfone resin; a polyethersulfone resin; a polyaryl resin; a polyetherimide resin; a polyacetal resin; a polyvinyl acetal resin; a polyketone resin; a polyether ketone resin; a polyether ether ketone resin; a polyarylketone resin; a polyether nitrile resin; a liquid crystal resin; a polybenzimidazole resin; a polyparabanic acid resin; a vinyl polymer or copolymer obtained by polymerizing or copolymerizing one or more vinyl monomers selected from the group consisting of an aromatic alkenyl compound, a methacrylic acid ester, an acrylic acid ester, and a vinyl cyanide compound; a diene-aromatic alkenyl compound copolymer;a vinyl cyanide-diene-aromatic alkenyl compound copolymer; an aromatic alkenyl compound-diene-vinyl cyanide-N-phenylmaleimide copolymer; a vinyl cyanide-(ethylene-diene-propylene (EPDM))-aromatic alkenyl compound copolymer; a vinyl chloride resin; and a chlorinated vinyl chloride resin. These resins can be used alone or in combination with two or more of them. [Properties of the resin composition]

[0134] In the resin composition of the present exemplary embodiment, the solubility of the resin composition in methyl ethyl ketone is 200 mg / ml or more at a liquid temperature of 25 °C.

[0135] When the solubility of the resin composition is 200 mg / ml or more, the effect of promoting the hydrolysis of component (A) by the epoxy group or hydroxy group of the aromatic compound (B) increases and the biodegradation rate of the obtained resin molded product is increased.

[0136] The solubility of the resin composition is preferably 250 mg / ml or more, and more preferably 300 mg / ml or more.

[0137] The solubility of the resin composition is measured as follows.

[0138] In a container, 100 ml of methyl ethyl ketone at a liquid temperature of 25 °C and 50000 mg of the resin composition to be measured are mixed, then ultrasonic waves with an oscillation frequency of 38 kHz are applied for 480 minutes and the mixed solution is then left to stand for 3 hours.

[0139] Next, the solution in the container is filtered through a filter with a pore size of 25 µm and the dry mass of the residue on the filter is measured.

[0140] The solubility is then calculated using the following formula: Solubility = (mass of resin composition dissolved in 100 ml of methyl ethyl ketone) / (100 ml of methyl ethyl ketone). [Method for preparing the resin composition]

[0141] Examples of the method for producing the resin composition according to the present exemplary embodiment include: a method for mixing and melt-kneading component (A), component (B), at least one of component (C) and component (D), and other components as needed; and a method for dissolving component (A), component (B), at least one of component (C), component (D), and other components as needed in a solvent. The melt-kneading means is not particularly limited, and examples thereof include a twin-screw extruder, a Henschel mixer, a Banbury mixer, a single-screw extruder, a multi-screw extruder, and a kneader. < Resin molded product>

[0142] The resin molded product according to the present exemplary embodiment contains the resin composition according to the present exemplary embodiment. That is, the resin molded product according to the present exemplary embodiment has the same composition as the resin composition according to the present exemplary embodiment.

[0143] Here, in addition to plastic waste, the granular materials (e.g., granular materials with a particle diameter of 1000 µm or less), so-called microbeads, easily pass through various filters and flow into the environment, e.g., the ocean, and must have faster biodegradability than resin molded products such as plastic bags or straws.

[0144] Therefore, the resin molded product of the present exemplary embodiment having rapid biodegradability can have any desired shape and is preferably a granular material (hereinafter also referred to as "resin particles").

[0145] The volume-average particle diameter of the granular material is preferably 3 µm or more and 100 µm or less, more preferably 5 µm or more and 70 µm or less, and even more preferably 8 µm or more and 60 µm or less.

[0146] When the particle diameter of the granular material is 3 µm or more, the number of particles per unit weight is not too large, thus preventing a decrease in the biodegradation rate. On the other hand, when the particle diameter of the granular material is 100 µm or less, the specific surface area is increased, and the biodegradation rate is further improved.

[0147] The volume-average particle diameter of the granular material is therefore preferably in the above range.

[0148] The particle size distribution index GSDv of the large diameter side of the granular material is preferably 1.5 or less, more preferably 1.3 or less, and even more preferably 1.2 or less.

[0149] With an almost uniform particle size distribution of the granular material, regular hydrolysis occurs with appropriate opportunity for water contact and the biological degradation rate is further improved.

[0150] The volume-average particle diameter and particle size distribution index GSDv of the large diameter side of the granular material are measured as follows.

[0151] The particle diameter is measured using an LS particle size distribution meter "Beckman Coulter LS13 320 (manufactured by Beckman Coulter, Inc.), taking the cumulative distribution of the particle diameter from the smaller diameter side by volume, and the particle diameter at which the cumulation is 50% is determined as the volume-average particle diameter.

[0152] On the other hand, the cumulative particle diameter distribution by volume is taken from the smaller diameter side, and the particle diameter corresponding to the cumulative percentage of 50% is defined as the number-average particle diameter D50v, and the particle diameter corresponding to the cumulative percentage of 84% is defined as the number-average particle diameter D84v. Then, the particle size distribution index GSDv of the larger diameter side is calculated according to the equation GSDv = (D84v / D50v). 1 / 2 calculated.

[0153] Examples of the methods for producing the granular material include the following methods. 1) a kneading and pulverizing process, wherein the respective components are kneaded and the resulting kneaded material is pulverized and classified to obtain a granular material 2) a dry manufacturing process in which the granular material obtained by kneading and pulverizing is changed in shape by mechanical action or thermal energy to obtain a granular material 3) an aggregation and coalescence process, wherein particle dispersion liquids of the respective components are mixed and the particles in the dispersion liquid are agglomerated and heated and fused to obtain a granular material 4) a solution-suspension method, wherein an organic solvent in which the respective components are dissolved is suspended in an aqueous solvent and a granular material containing the respective components is granulated

[0154] Among them, from the viewpoint of obtaining a granular material having a volume-average particle diameter and a particle size distribution index GSDv of the large diameter side in the above-mentioned ranges, a wet method such as an aggregation and coalescence method and a solution suspension method is preferable.

[0155] The method for molding the resin molded product according to the present exemplary embodiment may be an injection-molded product obtained by injection molding from the viewpoint of a high degree of freedom in the shape.

[0156] The cylinder temperature during injection molding of the resin molded product according to the present exemplary embodiment is, for example, 160°C or higher and 280°C or lower, and preferably 180°C or higher and 240°C or lower. The mold temperature during injection molding of the resin molded product according to the present exemplary embodiment is, for example, 40°C or higher and 90°C or lower, and preferably 40°C or higher and 60°C or lower.

[0157] The injection molding of the resin molded product according to the exemplary embodiment can be performed using commercially available devices such as NEX500 manufactured by NISSEI PLASTIC INDUSTRIAL CO., LTD., NEX150 manufactured by NISSEI PLASTIC INDUSTRIAL CO., LTD., NEX7000 manufactured by NISSEI PLASTIC INDUSTRIAL CO., LTD., PNX40 manufactured by NISSEI PLASTIC INDUSTRIAL CO., LTD., and SE50D manufactured by Sumitomo Heavy Industries, Ltd.

[0158] The resin molded product according to the present exemplary embodiment may be a resin molded product obtained by another molding method. Examples of other molding methods include extrusion molding, blow molding, hot press molding, calender molding, coating molding, casting molding, dipping molding, vacuum forming, and transfer molding.

[0159] Examples of uses of the resin molded product according to the present exemplary embodiment are granular materials of cosmetic base materials, rolling agents, abrasives, scouring agents, spacers for displays, bead molding materials, light-diffusing particles, resin reinforcing agents, refractive index control agents, biodegradation accelerators, fertilizers, water-absorbing particles, or toner particles.

[0160] The resin molded product according to the present exemplary embodiment is suitable for other applications such as electronic / electrical devices, office equipment, electrical household appliances, automotive interior materials, toys, containers, and the like. Examples of specific uses of the resin molded product according to the present exemplary embodiment include: housings of electronic / electrical devices or electrical household appliances; various parts of electronic / electrical devices or electrical household appliances; automotive interior parts; construction toys; plastic model kits; CD-ROM or DVD storage cases; tableware; beverage bottles; food trays; packaging materials; films; and plates. Examples

[0161] The resin composition and resin molded product according to the present exemplary embodiment will be described in more detail below using examples. The materials, amounts used, ratios, processing methods, and the like shown in the following examples can be changed accordingly without departing from the gist of the present invention. Therefore, the resin composition and resin molded product according to the present exemplary embodiment should not be interpreted restrictively by the following more detailed examples. <Herstellung der Materialien>

[0162] The following materials were produced. [Cellulose acylate (A)] • CA1: Eastman Chemical “CAP482-20”, cellulose acetate propionate, with a weight-average degree of polymerization of 716, a degree of substitution of acetyl groups of 0.18 and a degree of substitution of propionyl groups of 2.49. • CA2: Eastman Chemical “CAP504-0.2”, cellulose acetate propionate, with a weight-average degree of polymerization of 133, a degree of substitution of acetyl groups of 0.04 and a degree of substitution of propionyl groups of 2.09. • CA3: Eastman Chemical “CAB171-15”, cellulose acetate butyrate, with a weight-average degree of polymerization of 754, a degree of substitution of acetyl groups of 2.07 and a degree of substitution of butyryl groups of 0.73. • CA4: Daicel “L50”, diacetylcellulose, with a weight-average degree of polymerization of 570. • CA5: Daicel “LT-35”, triacetylcellulose, with a weight-average degree of polymerization of 385. [Aromatic compound (B)] • PAC1: Cardolite “NX-2503”, hydroxyethylated cardanol with a molecular weight of 296 to 320. • PAC2: Cardolite “Ultra LITE 513”, glycidyl ether of cardanol with a molecular mass of 354 to 361. • PAC3: DIC “EPICLON 865 alkyl modified product” phenol novolac epoxy resin [Examples 1 to 18 and Comparative Examples 1 to 3] (Production of resin pellets RE1 to RE13)

[0163] Kneading is carried out with a biaxial kneader (TEX41SS, manufactured by Toshiba Machine Co., Ltd.) using the filling ratios and cylinder temperatures shown in Table 1 to prepare pellet-shaped resin compositions RE1 to RE13 (hereinafter referred to as resin pellets RE1 to RE13). (Production of resin particles)-Production of resin particle PC1-

[0164] 300 g of the resin pellet (RE1) is completely dissolved in 700 g of methyl ethyl ketone. The resulting solution is added to an aqueous liquid containing 100 g of calcium carbonate, 4 g of carboxymethyl cellulose, and 200 g of methyl ethyl ketone dispersed in 1100 g of ultrapure water, followed by stirring for 3 hours. 10 g of sodium hydroxide is added to the resulting mixture, heated to 80 °C, and stirred for 3 hours to remove methyl ethyl ketone. After the residue is filtered, the solid is freeze-dried to obtain the resin particle PC1. -Production of resin particles PC2 to PC18-

[0165] The resin particles PC2 to PC18 are obtained in the same manner as the resin particle PC1, except that the resin pellet, the amounts of the components (the amount of calcium carbonate, the amount of carboxymethyl cellulose and the amount of methyl ethyl ketone) added to the aqueous liquid, the stirring time of the aqueous liquid and the amount of sodium hydroxide added are changed according to Table 2. -Production of resin particles PC19 and PC20-

[0166] Commercially available cellulose particles, CELLULOBEADS D10 (manufactured by DAITO KASEI KOGYO CO., LTD.) are produced as resin particles PC19 and BELLOCEA (manufactured by Daicel Corporation) as the resin particles PC20. <Messung von Partikeldurchmesser, Partikelgrößenverteilung und Löslichkeit>

[0167] According to the method described above, the volume-average particle diameter and particle size distribution GSDv of the resin particle are measured using the Beckman Coulter LS13 320 particle size distribution meter (manufactured by Beckman Coulter, Inc.).

[0168] In addition, the solubility of the resin pellet, which is the raw material of the resin particles, is measured according to the method described above.

[0169] The results are presented in Table 2. <Messung der biologischen Abbaubarkeit>

[0170] Using the resulting resin particles, the aerobic biodegradation rate was measured according to the ISO-14855-2 (2018) method and the anaerobic biodegradation rate was measured according to the ISO-14853 (2016) method. The time at which the biodegradation rate reached 50% and 90% was evaluated as the biodegradation rate. The results are presented in Table 2. [Table 1] resin pellet Cellulose acylate (A) Aromatic compound (B) (B) / (A) Kneading temperature (°C) Connection Mass fraction Connection Mass fraction RE1 CA1 100 PAC1 30 0,3 200 RE2 CA1 100 PAC1 15 0,15 200 RE3 CA1 100 PAC1 80 0,8 190 RE4 CA1 100 PAC2 30 0,3 200 RE5 CA1 100 PAC2 15 0,15 200 RE6 CA1 100 PAC2 80 0,8 190 RE7 CA2 100 PAC1 30 0,3 190 RE8 CA3 100 PAC1 30 0,3 200 RE9 CA4 100 PAC1 30 0,3 240 RE10 CA5 100 PAC1 30 0,3 270 RE11 CA1 100 PAC1 12 0,12 200 RE12 CA1 100 PAC1 85 0,85 190 RE13 CA1 100 PAC3 30 0,3 210 RE14 CA1 100 - - 0 240 [Table 2] Resin particles I Resin Pelle t Amount added (g) to the aqueous liquid Stirring time of the aqueous liquid (hours) Added amount (g) sodium hydroxide Particle diameter (µm) GSD v Solubility mg / ml Calcium carbonate at Carboxymethylcellulose Methyl ethyl ketone PC1 RE1 100 4 200 3 10 30 1,17 300 PC2 RE1 250 4 200 3 10 3 1,21 320 PC3 RE1 40 4 200 3 10 100 1,19 290 PC4 RE1 100 4 200 3 5 32 1,48 290 PC5 RE2 100 4 200 3 10 28 1,18 210 PC6 RE3 100 4 200 3 10 31 1,19 420 PC7 RE4 100 4 200 3 10 27 1,25 300 PC8 RE5 100 4 200 3 10 20 1,3 220 PC9 RE6 100 4 200 3 10 25 1,22 410 PC10 RE7 100 4 200 3 10 22 1,23 320 PC11 RE8 100 4 200 3 10 23 1,25 360 PC12 RE9 100 4 200 3 10 28 1,22 220 PC13 RE1 0 100 4 200 3 10 35 1,21 200 PC14 RE1 1 100 4 200 3 10 32 1,19 190 PC15 RE1 2 100 4 200 3 10 33 1,17 440 PC16 RE1 400 4 200 3 10 1,5 1,18 270 PC17 RE1 10 4 200 3 10 110 1,21 260 PC18 RE1 100 4 200 1 0 32 1,53 250 PC19 CELLULOBEADS D-10 (manufactured by DAITO KASEI KOGYO CO., LTD.) 10 1,77 5 PC20 BELLOCEA (manufactured by Daicel Corporation) 20 1,89 40 PC21 RE1 3 100 4 200 3 10 30 1,22 240 PC22 RE1 4 The dissolution in MEK is insufficient, so granulation cannot be carried out. 50 [Table 3] category particles Aerobic biodegradation rate Anaerobic biodegradation rate 50% decomposition (day) 90% decomposition (Taq) 50% decomposition (Taq) 90% decomposition (Taq) Example 1 PC1 3 7 4 10 Example 2 PC2 2 6 3 8 Example 3 PC3 4 9 6 12 Example 4 PC4 5 11 7 15 Example 5 PC5 4 8 6 11 Example 6 PC6 2 5 3 6 Example 7 PC7 5 10 6 14 Example 8 PC8 6 12 7 15 Example 9 PC9 3 8 4 11 Example 10 PC10 2 6 3 9 Example 11 PC11 3 7 4 11 Example 12 PC12 8 15 10 22 Example 13 PC13 10 20 13 26 Comparison example 1 PC14 23 60 30 70 Example 14 PC15 16 45 24 66 Example 15 PC16 14 42 20 56 Example 16 PC17 16 45 23 65 Example 17 PC18 20 50 28 72 Comparison example 2 CELLULOBEADS D-10 (manufactured by DAITO KASEI KOGYO CO., LTD.) 25 62 32 80 Comparison example 3 BELLOCEA (manufactured by Daicel Corporation) 24 58 28 72 Example 18 PC21 6 15 11 24

[0171] The above results show that the resin particles of Examples 1 to 18 have a higher biodegradation rate than the resin particles of Comparative Examples 1 to 3. (Example 19 and Comparative Example 4)

[0172] Using the resin pellets RE1 (corresponding to the examples) and RE11 (corresponding to the comparative examples) shown in Table 1, a test piece with a size of 10 mm × 12.5 mm and a thickness of 4 mm was injection molded using an injection molding machine (NEX500I, manufactured by NISSEI PLASTIC INDUSTRIAL CO., LTD.) at an injection pressure of 180 MPa or less, a molding temperature of 190 °C, and a mold temperature of 40 °C.

[0173] The biodegradability of each test piece is measured. The results are presented in Table 4. [Table 4] category resin pellet Aerobic biodegradation rate Anaerobic biodegradation rate 50% decomposition (day) 90% decomposition (Taq) 50% decomposition (Taq) 90% decomposition (Taq) Example 19 RE1 7 18 10 24 Comparison example 4 RE11 30 64 38 74

[0174] The above results show that the resin molded product of Example 19 has a higher biodegradation rate than the resin molded product of Comparative Example 4.< / harzzusammensetzung>

Claims

[1] Resin composition comprising: a cellulose acylate (A); and an aromatic compound (B) which does not contain a functional group which reacts with the cellulose acylate (A), but contains a long-chain aliphatic group having 6 or more and 30 or fewer carbon atoms, and at least one of a phenolic hydroxy group and a monoglycidyl ether group which is directly bonded to an aromatic group of the aromatic compound (B), wherein a mass ratio (B) / (A) of the aromatic compound (B) to the cellulose acylate (A) is 0.15 or more, and wherein a solubility of the resin composition in methyl ethyl ketone is 200 mg / ml or more at a liquid temperature of 25 °C. [2] The resin composition according to claim 1, wherein a mass ratio (B) / (A) of the aromatic compound (B) to the cellulose acylate (A) is 0.15 or more and 0.80 or less. [3] The resin composition according to claim 1 or 2, wherein the cellulose acylate (A) comprises at least one selected from the group consisting of cellulose acetate propionate and cellulose acetate butyrate. [4] The resin composition according to any one of claims 1 to 3, wherein the aromatic compound (B) is a cardanol compound (B1). [5] The resin composition according to claim 4, wherein the cardanol compound (B1) is at least one compound selected from the group consisting of a compound represented by the following general formula (CDN1) and a polymer obtained by polymerizing the compound represented by the following general formula (CDN1). R 1 represents in the general formula (CDN1) an alkyl group which may have a substituent or an unsaturated aliphatic group which has a double bond and may have a substituent, R 2represents a hydroxy group, a carboxy group, an alkyl group which may have a substituent, or an unsaturated aliphatic group which has a double bond and may have a substituent, P2 represents an integer of 0 or more and 4 or less, and plural R 2 can be the same group or different groups if P2 is 2 or more. [6] A resin molded product comprising the resin composition according to any one of claims 1 to 5. [7] The resin molded product according to claim 6, which is a granular material. [8] The resin molded product according to claim 7, wherein a volume-average particle diameter of the granular material is 3 µm or more and 100 µm or less. [9] The resin molded product according to claim 7 or 8, wherein a particle size distribution index GSDv of the large diameter side of the granular material is 1.5 or less.