Composition, molded body, and method for producing composition

Abstract

The present invention addresses the problem of providing a composition having excellent surface impact strength, and a method for producing the composition. The composition according to the present invention contains a cellulose derivative and a polyrotaxane, and is amorphous.

Description

Composition, molded body, and method for producing composition

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

[0002] Conventionally, various types of resin compositions have been developed and are used as various parts and housings of various products, such as home appliances, automobiles, office equipment, and electronic and electrical equipment. In particular, when used in applications such as aerospace, automobiles, and sporting goods, high strength comparable to that of metals is required, and various high-strength resin materials, such as engineering plastics and super engineering plastics, have been developed. In addition, in recent years, from an environmental perspective, there has been an increasing demand for the use of biomass-derived resins and biodegradable resin compositions for the above-mentioned applications.

[0003] As an example of such a resin composition, Patent Document 1 discloses a resin composition that contains a resin having carbon atoms derived from biomass and satisfies specific requirements.

[0004] Japanese Patent Application Laid-Open No. 2020-037614

[0005] The present inventors have studied the resin composition described in Patent Document 1 and found that there is room for further improvement in dart impact strength. In this specification, "excellent dart impact strength" means that the maximum impact force and the energy at the maximum impact force are excellent.

[0006] Therefore, an object of the present invention is to provide a composition having excellent dart impact strength, a molded article made from the composition, and a method for producing the composition.

[0007] As a result of extensive research into solving the above problems, the present inventors have found that the problems can be solved by the following configuration.

[0008] [1] A composition comprising a cellulose derivative and a polyrotaxane, wherein the composition is amorphous. [2] The composition according to [1], wherein the cellulose derivative is cellulose acylate. [3] The composition according to [2], wherein the cellulose acylate has a degree of acyl substitution of 1.7 to 2.6. [4] The composition according to any one of [1] to [3], wherein the cellulose derivative is at least one selected from the group consisting of cellulose acetate, cellulose acetate propionate, and cellulose acetate butyrate. [5] The composition according to any one of [1] to [4], wherein the cellulose derivative is cellulose acetate. [6] The composition according to [5], wherein the acetyl substitution degree of the cellulose acetate is 1.7 to 2.6. [7] The composition according to any one of [1] to [6], further comprising a plasticizer. [8] The composition according to [7], wherein the plasticizer is at least one selected from the group consisting of a cardanol compound, a carboxylic acid ester compound, and an alkyldiol having 9 to 14 carbon atoms. [9] The composition according to any one of [1] to [8], wherein the mass ratio of the content of the polyrotaxane to the content of the cellulose derivative is 0.10 or less.

[10] A molded article comprising the composition according to any one of [1] to [9].

[11] The molded article according to

[10] , wherein the maximum impact force is 4000 N or more.

[12] A method for producing an amorphous composition comprising a cellulose derivative and a polyrotaxane, the method comprising the step of melt-kneading the cellulose derivative and the polyrotaxane substantially in the absence of a solvent.

[0009] The present invention can provide a composition having excellent dart impact strength, as well as a molded article of the composition and a method for producing the composition.

[0010] The present invention will be described in detail below. The following description of the components may be based on representative embodiments of the present invention, but the present invention is not limited to such embodiments.

[0011] In this specification, a numerical range expressed using "to" means a range that includes the numerical values ​​written before and after "to" as the lower and upper limits. Furthermore, in this specification, when two or more types of a certain component are present, the "content" of that component means the total content of those two or more components. In this specification, in a numerical range described in stages, the upper or lower limit value described in a certain numerical range may be replaced with the upper or lower limit value of another numerical range described in stages. Furthermore, in a numerical range described in this specification, the upper or lower limit value described in a certain numerical range may be replaced with a value shown in the Examples. In this specification, a combination of two or more preferred embodiments is a more preferred embodiment.

[0012] In this specification, when there are a plurality of substituents, linking groups, etc. (hereinafter referred to as "substituents, etc.") represented by a specific symbol, or when a plurality of substituents, etc. are simultaneously specified, it means that the respective substituents, etc. may be the same or different from each other. This also applies to the specification of the number of substituents, etc.

[0013] [Composition] The composition of the present invention will be described in detail below. The composition of the present invention (hereinafter also simply referred to as "composition") contains a cellulose derivative and a polyrotaxane, and is amorphous.

[0014] Although the reason why the composition having the above configuration can solve the problems of the present invention is not entirely clear, the inventors speculate as follows. Note that the following speculation does not limit the mechanism by which the effect is obtained. In other words, even if the effect is obtained by a mechanism other than the one described below, it is still within the scope of the present invention. Amorphous compositions containing cellulose derivatives have reduced mechanical strength because they do not have a crystalline structure. In contrast, the composition of the present invention further contains polyrotaxane, and the cyclic structure of the polyrotaxane can absorb impact energy, overturning conventional wisdom and demonstrating extremely superior dart impact strength compared to crystalline compositions.

[0015] [Cellulose Derivative] The composition contains a cellulose derivative. The cellulose derivative refers to a modified cellulose in which at least a portion of the hydroxy groups of cellulose, a natural polymer, have been chemically modified. The chemical modification is not particularly limited, but examples include esterification, alkyl etherification, and hydroxyalkyl etherification of the hydroxy groups, with esterification being preferred. In other words, suitable cellulose derivatives include cellulose acylate, alkyl cellulose, and hydroxyalkyl cellulose, with cellulose acylate being more preferred. When the resin constituting the composition is a cellulose derivative, the composition can exhibit biodegradability. In other words, the composition of the present invention exhibits excellent dart impact strength while exhibiting biodegradability.

[0016] <Cellulose Acylate> Cellulose acylate is a cellulose derivative in which hydrogen atoms in at least some of the hydroxy groups of cellulose are substituted with acyl groups. Examples of cellulose acylate include cellulose derivatives represented by the following general formula (CA):

[0017]

[0018] In 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 more. １ , n A ２ , and n A ３ At least one of the n A's present in the molecule represents an acyl group. １ , A ２ , and A ３ may be the same or different from each other.

[0019] A １ , A ２ , and A ３The hydrocarbon group contained in the acyl group represented by the formula (I) may be either an aliphatic hydrocarbon group or an aromatic hydrocarbon group, but is preferably an aliphatic hydrocarbon group. The aliphatic hydrocarbon group may be linear, branched, or cyclic, but is preferably linear or branched, and more preferably linear. The aliphatic hydrocarbon group may be either a saturated aliphatic hydrocarbon group or an unsaturated aliphatic hydrocarbon group, but is preferably a saturated aliphatic hydrocarbon group. In terms of achieving better effects of the present invention, the number of carbon atoms in the acyl group is preferably 1 to 6, more preferably 2 to 4, and even more preferably 2 or 3. The acyl group may have a substituent, but is preferably unsubstituted. Examples of the substituent include a halogen atom (e.g., a fluorine atom, a chlorine atom, a bromine atom, and an iodine atom), a hydroxy group, and an amino group. Examples of the acyl group include a formyl group, an acetyl group, a propionyl group, a butyryl group (butanoyl group), a propenoyl group, and a hexanoyl group. An acetyl group, a propionyl group, or a butyryl group is preferred, and an acetyl group is more preferred.

[0020] Examples of cellulose acylate include cellulose acetate (cellulose monoacetate, cellulose diacetate (DAC), cellulose triacetate, etc.), cellulose acetate propionate (CAP), and cellulose acetate butyrate (CAB), with cellulose acetate being preferred in terms of providing better effects of the present invention.

[0021] The weight-average molecular weight (Mw) of cellulose acylate is preferably 20,000 to 200,000, more preferably 70,000 to 180,000, and even more preferably 90,000 to 160,000. From the viewpoint of achieving the effects of the present invention and achieving superior moldability, the weight-average degree of polymerization of cellulose acylate is preferably 150 to 1,000, more preferably 300 to 700. The weight-average molecular weight (Mw) of cellulose acylate can be measured using tetrahydrofuran as a solvent and a gel permeation chromatography apparatus (GPC apparatus: Tosoh Corporation, HLC-8320GPC, column: TSKgel α-M), expressed in terms of polystyrene. The weight-average degree of polymerization can be calculated by dividing the obtained weight-average molecular weight (Mw) by the molecular weight of the constituent unit of cellulose acylate. For example, when the degree of acetyl substitution is 2.4, the molecular weight of the constituent unit of cellulose acylate is 263.

[0022] In terms of achieving better effects of the present invention, the degree of acyl substitution of cellulose acylate is preferably 1.4 to 2.9, more preferably 1.7 to 2.6, and even more preferably 2.3 to 2.5. The degree of acyl substitution is an index representing the degree to which hydrogen atoms of hydroxy groups in cellulose are substituted with acyl groups (i.e., acylation), and specifically means the intramolecular average of acylated hydroxy groups among the three hydroxy groups present in a D-glucopyranose unit. The degree of acyl substitution is １ It is determined from the integral ratio of the peak of hydrogen atoms derived from cellulose to the peak of hydrogen atoms derived from acyl groups, obtained by H-NMR. Specifically, using tetramethylsilane as a standard substance, １ H-NMR (JMN-ECA / JEOL RESONANCE) measurement is carried out, and the integral value of the peak derived from the hydroxy group present at a chemical shift of 4.5 to 5.5 ppm is defined as P1, and the integral value of the peak derived from the acyl group present at a chemical shift of 2.5 to 3.5 ppm is divided by the number of hydrogen atoms in the corresponding acyl group (for example, 3 hydrogen atoms in the case of an acetyl group), and the P2 value is calculated using the following formula (10): １As a solvent for H-NMR measurement, a solvent selected from tetrahydrofuran-d8, chloroform-d, methanol-d4, and dimethyl sulfoxide-d6 can be used, and it is preferable to use tetrahydrofuran-d8. Acyl substitution degree = P2 / (P1 + P2) Equation (10)

[0023] In cellulose acetate propionate (CAP), the ratio of the degree of substitution of acetyl groups to the degree of substitution of propionyl groups is preferably 0.01 to 1.0, more preferably 0.05 to 0.1.In cellulose acetate butyrate (CAB), the ratio of the degree of substitution of acetyl groups to the degree of substitution of butyryl groups is preferably 0.05 to 3.5, more preferably 0.5 to 3.0.

[0024] The acetyl substitution degree of the cellulose acetate is preferably 1.4 to 2.9, more preferably 1.7 to 2.6, and even more preferably 2.3 to 2.5. The acetyl substitution degree can be determined by the same method as that for the acyl substitution degree described above.

[0025] Examples of cellulose derivatives other than cellulose acetate include alkyl celluloses such as methyl cellulose, ethyl cellulose, propyl cellulose, and butyl cellulose, hydroxyalkyl celluloses such as hydroxyethyl cellulose, hydroxypropyl cellulose, hydroxypropyl methyl cellulose, and hydroxybutyl methyl cellulose, carboxymethyl cellulose, and nitrocellulose.

[0026] The cellulose derivative may be used alone or in combination of two or more.The content of the cellulose derivative is preferably 70% by mass or more, more preferably 80% by mass or more, based on the total mass of the composition, in order to obtain a more excellent effect of the present invention.The upper limit of the content of the cellulose derivative is less than 100% by mass, preferably 99% by mass or less, more preferably 93% by mass or less, based on the total mass of the composition.

[0027] [Polyrotaxane] The composition contains a polyrotaxane. A polyrotaxane is a molecular complex in which the openings of multiple cyclic molecules are pierced in a skewer-like manner by an axial molecule, and multiple cyclic molecules encapsulate the axial molecule. Blocking groups are arranged at both ends (both ends of the axial molecule) of the pseudo-polyrotaxane to prevent the cyclic molecules from becoming free. In polyrotaxane, the cyclic molecules can move freely on the axial molecule, thereby exhibiting the effect of alleviating external and internal stress. It is believed that the composition contains polyrotaxane in addition to the above-mentioned cellulose derivative, which alleviates stress when subjected to a lateral impact, thereby exhibiting excellent lateral impact strength.

[0028] <Axial Molecule> The axial molecule in the polyrotaxane has an axial portion that passes through the cyclic molecule, and further has a blocking group at the end of the axial portion that prevents the cyclic molecule from being detached. The axial portion of the axial molecule is not particularly limited, but is preferably a divalent aliphatic hydrocarbon group, and more preferably an alkylene group. Note that one or more carbon atoms constituting the divalent aliphatic hydrocarbon group may be -O-, -S-, -SO ２ The divalent aliphatic hydrocarbon group may be substituted with -, -N(R)- (R: hydrogen atom or substituent), -CO-, -COO-, -CONR- (R: hydrogen atom or substituent), or a group combining these. In terms of the effects of the present invention, the divalent aliphatic hydrocarbon group may be substituted with -, -N(R)- (R: hydrogen atom or substituent), -CO-, -COO-, -CONR- (R: hydrogen atom or substituent), or a group combining these. ２ It is preferably substituted by -, -N(R)- (R: hydrogen atom or substituent), -CO-, -COO-, -CONR- (R: hydrogen atom or substituent), or a group in which these are combined.

[0029] The axial molecule is preferably formed by introducing a blocking group into a molecule constituting the axial portion having a functional group to which a blocking group can be introduced (e.g., a hydroxy group, an amino group, a carboxy group, a thiol group, etc.). The molecule constituting the axial portion is preferably a linear molecule, and examples thereof include polyalkylene glycols such as polyethylene glycol, polypropylene glycol, and polytetramethylene glycol; polyesters such as polycaprolactone diol, polylactic acid, polyethylene adipate, polybutylene adipate, polyethylene terephthalate, and polybutylene terephthalate; hydroxyl-terminated polyolefins such as polybutadiene diol, polyisoprene diol, polyisobutylene diol, poly(acrylonitrile-butadiene)diol, hydrogenated polybutadiene diol, polyethylene diol, and polypropylene diol; terminally functionalized polysiloxanes such as terminally silanol-type polydimethylsiloxane; and amino-terminated linear polymers such as amino-terminated polyethylene glycol, amino-terminated polypropylene glycol, and amino-terminated polybutadiene. The molecule constituting the shaft portion is preferably a polyalkylene glycol or a polyester.

[0030] The blocking group may be any group that has the function of preventing the cyclic molecule from detaching from the axis molecule, and examples thereof include bulky substituents. Examples of the blocking group include a dinitrophenyl group, a cyclodextrin group, an adamantyl group, a trityl group, a fluoresceinyl group, a pyrenyl group, an anthracenyl group, and derivatives thereof.

[0031] The weight average molecular weight (Mw) of the axial molecule is preferably 5,000 to 50,000, and more preferably 10,000 to 30,000.

[0032] <Cyclic Molecule> The cyclic molecule is not particularly limited as long as it is a cyclic molecule that can encompass the above-mentioned axial molecule, and examples thereof include cyclodextrins (e.g., α-cyclodextrin, β-cyclodextrin, γ-cyclodextrin, dimethylcyclodextrin, and glucosylcyclodextrin), crown ethers, benzocrowns, dibenzocrowns, dicyclohexanocrowns, calixarenes, macrocyclic amines, and cyclophanes, as well as derivatives or modified products thereof. Cyclodextrins are preferred because of their excellent compatibility with cellulose derivatives, and α-cyclodextrin, β-cyclodextrin, or γ-cyclodextrin, or derivatives thereof are more preferred.

[0033] The cyclic molecule may have a functional group or may be modified with a hydrophobic group, such as a polymerizable group (e.g., an ethylenically unsaturated double bond), an amino group, a glycidyl group, a carboxy group, an isocyanate group, a thiol group, or a sulfonic acid group.

[0034] The cyclic molecule may have a side chain. The term "cyclic molecule having a side chain" refers to an embodiment in which the cyclic molecule is modified with a polymer chain, and examples thereof include an embodiment in which a hydroxy group of a cyclodextrin is modified with a polymer chain. The side chain is not particularly limited, but examples thereof include polyester. Examples of polyester include polycaprolactone, polylactic acid, polyglycolic acid, poly3-hydroxybutyrate, and poly4-hydroxybutyrate, with polycaprolactone being preferred. It is also preferable that the cyclodextrin does not have a side chain. It is presumed that using a cyclodextrin without a side chain as the cyclic molecule provides excellent compatibility between the cellulose derivative and the polyrotaxane, uniform dispersion of the polyrotaxane, and more efficient improvement in dart impact strength due to the polyrotaxane, thereby further enhancing the effects of the present invention.

[0035] The weight average molecular weight (Mw) of the polyrotaxane is preferably 10,000 to 1,000,000, more preferably 10,000 to 900,000, and even more preferably 15,000 to 900,000. The weight average molecular weight (Mw) of the polyrotaxane can be measured by gel permeation chromatography (GPC) or the like.

[0036] Polyrotaxanes can be synthesized by known methods, for example, by mixing molecules constituting the shaft portion with cyclic molecules to form a pseudopolyrotaxane, and then introducing a blocking group.

[0037] In order to achieve superior effects of the present invention, the mass ratio of the polyrotaxane content to the cellulose derivative content is preferably 0.50 or less, more preferably 0.10 or less, and even more preferably 0.05 or less. The mass ratio of the polyrotaxane content to the cellulose derivative content is greater than 0, and in order to achieve superior effects of the present invention, it is preferably 0.001 or more, and even more preferably 0.002 or more. The mass ratio of the polyrotaxane content to the cellulose derivative content is also preferably 0.001 to 0.50, more preferably 0.001 to 0.10, and even more preferably 0.002 to 0.05. Even when the polyrotaxane content of the composition of the present invention is as small as 0.10 or less in mass ratio to the cellulose derivative content, the composition of the present invention exhibits significantly improved dart impact strength at a level not expected from conventional techniques compared to compositions not containing polyrotaxane, and exhibits dart impact strength comparable to that of so-called super engineering plastics. The content of polyrotaxane is preferably 0.01 to 20% by mass, more preferably 0.1 to 10% by mass, and even more preferably 0.2 to 5% by mass, relative to the total mass of the composition. The content of each component (e.g., polyrotaxane) can be calculated from the mass of each component extracted by separation or the like and the mass of the composition and other components before extraction. Specifically, the content of polyrotaxane can be calculated by the following method: A composition containing a cellulose derivative (e.g., cellulose acetate) and a water-soluble polyrotaxane (e.g., a polyrotaxane composed of an axial molecule derived from polyethylene oxide and cyclodextrin as a cyclic molecule) is dissolved in methylene chloride, and then water is added to perform a separation operation, extracting the cellulose derivative (e.g., cellulose acetate) into the methylene chloride phase and the polyrotaxane into the aqueous phase. After the separation, each phase is dried to obtain a solid content mass, from which the content of polyrotaxane relative to the total mass of the composition is determined.

[0038] [Plasticizer] In order to obtain the effects of the present invention and to obtain superior moldability, it is preferable that the composition further contains a plasticizer. By containing a plasticizer, the flexibility of the composition is improved and the dart impact strength is superior. Examples of the plasticizer include cardanol compounds, ester compounds, alkyl diols, polyols, camphor, metal soaps, and polyalkylene oxides. Cardanol compounds, ester compounds, or alkyl diols are preferred, and cardanol compounds are more preferred.

[0039] <Cardanol Compound> Cardanol compounds are components contained in naturally occurring compounds derived from cashews and derivatives thereof. Examples of the naturally occurring compounds derived from cashews include compounds represented by the following formulas (c-1) to (c-4).

[0040]

[0041] The cardanol compound may be used alone or in combination of two or more. That is, the cardanol compound may be a mixture of naturally occurring compounds derived from cashews (hereinafter also referred to as a "cashew-derived mixture").

[0042] The cardanol compound may be a derivative of a cashew-derived mixture, and examples thereof include the following compounds and mixtures: A mixture in which the compositional ratio of each component in the cashew-derived mixture has been adjusted A monolayer obtained by isolating only a specific component from the cashew-derived mixture A mixture containing modified products obtained by modifying a component in the cashew-derived mixture A mixture containing a polymer obtained by polymerizing a component in the cashew-derived mixture A mixture containing a modified polymer obtained by modifying and polymerizing a component in the cashew-derived mixture A mixture containing modified products obtained by further modifying a component in a mixture in which the compositional ratio has been adjusted A mixture containing a polymer obtained by further polymerizing a component in a mixture in which the compositional ratio has been adjusted A mixture containing a modified polymer obtained by further modifying and polymerizing a component in a mixture in which the compositional ratio has been adjusted A modified product obtained by further modifying the isolated monolayer A polymer obtained by further polymerizing the isolated monolayer A modified polymer obtained by further modifying and polymerizing the isolated monolayer It should be noted that the above monolayers also include oligomers such as dimers and trimers.

[0043] The cardanol compound is preferably at least one selected from the group consisting of compounds represented by general formula (CDN1) and polymers of compounds represented by general formula (CDN1), in terms of achieving better effects of the present invention and excellent biodegradability of the composition.

[0044]

[0045] In the general formula (CND1), R １ represents an alkyl group which may have a substituent, or an unsaturated aliphatic group which may have a substituent. ２ each independently represents a hydroxy group, a carboxy group, an alkyl group which may have a substituent, or an unsaturated aliphatic group which may have a substituent. P2 represents an integer of 0 to 4. R ２ If there are multiple R ２ may be the same or different from each other.

[0046] R １ The number of carbon atoms in the alkyl group which may have a substituent, represented by the formula (I), is preferably 3 to 30, more preferably 5 to 25, and even more preferably 8 to 20. Examples of the substituent which the alkyl group may have include a hydroxy group, an ether bond-containing group (e.g., an alkoxy group, an epoxy group, and an oxetanyl group), an acyl group, and an ester bond-containing group (e.g., an alkyloxycarbonyl group and an alkylcarbonyloxy group). 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 undecane-1-yl group, a dodecane-1-yl group, and a tetradecan-1-yl group.

[0047] R １The number of carbon atoms in the unsaturated aliphatic group which may have a substituent represented by the formula (I) is preferably 3 to 30, more preferably 5 to 25, and even more preferably 8 to 20. The unsaturated aliphatic group preferably has at least a double bond. The number of double bonds in the unsaturated aliphatic group is preferably 1 to 3. Examples of the substituent which the unsaturated aliphatic group may have include the substituents which the alkyl group may have. Examples of the unsaturated aliphatic group which may have a substituent include a pentadec-8-en-1-yl group, a pentadeca-8,11-dien-1-yl group, a pentadeca-8,11,14-trien-1-yl group, a pentadec-7-en-1-yl group, a pentadeca-7,10-dien-1-yl group, and a pentadeca-7,10,14-trien-1-yl group.

[0048] R １ As the alkyl group, a pentadec-8-en-1-yl group, a pentadeca-8,11-dien-1-yl group, a pentadeca-8,11,14-trien-1-yl group, a pentadec-7-en-1-yl group, a pentadeca-7,10-dien-1-yl group, or a pentadeca-7,10,14-trien-1-yl group is preferred.

[0049] In the general formula (CND1), R ２ The definitions and preferred embodiments of the optionally substituted alkyl group and the optionally substituted unsaturated aliphatic group represented by R １ The alkyl group and the unsaturated aliphatic group are the same as those optionally having a substituent and optionally having a substituent, respectively.

[0050] The compound represented by general formula (CDN1) and its polymer may be modified, for example, epoxidized. Specifically, the compound may be a compound represented by general formula (CDN1-e) in which the hydroxy group of the compound represented by general formula (CDN1) is substituted with the following group (EP):

[0051]

[0052] In the group (EP) and general formula (CDN1-e), L ＥＰ represents a single bond or a divalent linking group.１ , R ２ , and P2 are R in general formula (CND1), respectively. １ , R ２ , and P2.

[0053] L ＥＰ Examples of the divalent linking group represented by the formula (I) include an alkylene group (preferably having 1 to 4 carbon atoms, more preferably having 1 carbon atom) which may have a substituent, and —CH ２ CH ２ OCH ２ CH ２ Examples of the substituent that the alkylene group may have include R １ Examples of the substituents that may be possessed by the alkyl group represented by the formula: ＥＰ As the alkyl group, a methylene group is preferred.

[0054] The polymer of the compound represented by general formula (CDN1) refers to a polymer in which compounds represented by general formula (CDN1) are linked via a linking group or a single bond, and examples thereof include compounds represented by the following general formula (CDN2):

[0055]

[0056] In the general formula (CDN2), R １１ , R １２ , and R １３ R each independently represents an alkyl group which may have a substituent, or an unsaturated aliphatic group which may have a substituent. 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 may have a substituent. P21 and P23 each independently represent an integer of 0 to 3. P22 represents an integer of 0 to 2. L １ and L ２ each independently represents a divalent linking group, and n represents an integer of 0 or more and 10 or less. ２１ , R ２２ , R ２３ , R １２ , P22, and ,L １When there are multiple R ２１ , R ２２ , R ２３ , R １２ , P22, and ,L １ may be the same or different from each other.

[0057] In the general formula (CDN2), R １１ , R １２ , and R １３ The definition and preferred embodiments of are as follows: １ is the same as the group represented by R ２１ , R ２２ , and R ２３ The definition and preferred embodiments of are as follows: ２ is the same as the group represented by

[0058] In the general formula (CDN2), L １ and L ２ Examples of the divalent linking group represented by the formula (CDN) include an alkylene group (preferably having 2 to 30 carbon atoms, more preferably having 5 to 20 carbon atoms) which may have a substituent. Examples of the substituent which the alkylene group may have include R １ Examples of the substituents that may be possessed by the alkyl group represented by the following formula are given.

[0059] In formula (CDN2), n is preferably 1 to 10, and more preferably 1 to 5.

[0060] The compound represented by general formula (CDN2) may be modified, for example, epoxidized. Specifically, the compound may be a compound represented by general formula (CDN2-e) in which the hydroxy group of the compound represented by general formula (CDN2) is substituted with the above-mentioned group (EP).

[0061]

[0062] In the general formula (CDN2-e), R １１ , R １２ , R １３ , R ２１ , R ２２ , R ２３ , P21, P22, P23, L １ , L２ , and n are R in general formula (CDN2), respectively. １１ , R １２ , R １３ , R ２１ , R ２２ , R ２３ , P21, P22, P23, L １ , L ２ , and n. ＥＰ１ , L ＥＰ２ , and L ＥＰ３ each independently represents a single bond or a divalent linking group. ＥＰ２ If there are multiple L ＥＰ２ may be the same or different from each other.

[0063] In the general formula (CDN2), L ＥＰ１ , L ＥＰ２ , and L ＥＰ３ The definition and preferred embodiments of the group represented by the formula (EP) are ＥＰ is the same as

[0064] The polymer of the compound represented by general formula (CDN1) and the polymer of the compound represented by general formula (CDN1-e) may be a three-dimensionally crosslinked polymer. Examples of these polymers include compounds represented by the following structural formulas:

[0065]

[0066]

[0067] In the above structural formula, R １０ , R ２０ , and P20 are R in general formula (CDN1), respectively. １ , R ２ , and P2. １０ represents L in general formula (CDN2). １ It is the same as the above. １０ , R ２０ , P20, and ,L １０ may be the same or different from each other.

[0068] Commercially available cardanol compounds may be used. Examples of commercially available products 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 Kako Co., Ltd. Commercially available cardanol compounds having an epoxy group include NC-513, NC-514S, NC-547, LITE513E, and Ultra LITE 513 manufactured by Cardolite Corporation.

[0069] The hydroxyl value of the cardanol compound is preferably 100 mgKOH / g or more, more preferably 120 mgKOH / g or more, and even more preferably 150 mgKOH / g or more. The hydroxyl value of the cardanol compound is measured in accordance with ISO 14900 Method A. When the cardanol compound is modified with an epoxy group, the epoxy equivalent is preferably 300 to 500, more preferably 350 to 480, and even more preferably 400 to 470. The epoxy equivalent is measured in accordance with ISO 3001.

[0070] The molecular weight of the cardanol compound is preferably 250 to 1000, more preferably 280 to 800, and even more preferably 300 to 500. When the cardanol compound has a molecular weight distribution, the above molecular weight represents the weight average molecular weight.

[0071] <Ester Compound> The ester compound is a compound different from the above-described components (cellulose derivative, polyrotaxane, and cardanol compound). Examples of the ester compound include carboxylic acid ester compounds, phosphate ester compounds, and condensed phosphate ester compounds, and carboxylic acid ester compounds are preferred.

[0072] Examples of the carboxylic acid ester compound include fatty acid ester compounds and aromatic carboxylic acid ester compounds. Examples of the fatty acid ester compound include aliphatic monocarboxylic acid esters (acetic acid esters, etc.), aliphatic dicarboxylic acid esters (succinic acid esters, adipate-containing compounds, azelaic acid esters, sebacates, stearates, etc.), and aliphatic tricarboxylic acid esters (citric acid esters, isocitrate esters, etc.). Examples of the aromatic carboxylic acid ester compound include dimethyl phthalate, diethyl phthalate, bis(2-ethylhexyl) phthalate, and terephthalate.

[0073] In terms of achieving superior effects of the present invention, the carboxylic acid ester compound is preferably a fatty acid ester compound, more preferably an aliphatic dicarboxylic acid ester or an aliphatic tricarboxylic acid ester, and even more preferably a citrate ester, an adipate ester, or a sebacate ester. Examples of the carboxylic acid ester compound include esters of carboxylic acids and alcohols that form the respective carboxylic acid ester compounds. The alcohol preferably has 1 to 12 carbon atoms, more preferably 1 to 8 carbon atoms. Examples of the alcohol include monohydric alcohols such as methanol, ethanol, propanol, butanol, and 2-ethylhexanol; and polyhydric alcohols such as glycerin, polyglycerin (diglycerin, etc.), pentaerythritol, ethylene glycol, diethylene glycol, propylene glycol, trimethylolpropane, trimethylolethane, and sugar alcohols.

[0074] The carboxylic acid ester compound may be modified, for example, an epoxidized fatty acid ester. Epoxidized fatty acid esters are ester compounds having a structure in which the carbon-carbon unsaturated bonds of an unsaturated fatty acid ester have been epoxidized (i.e., oxacyclopropane). Examples of epoxidized fatty acid esters include esters of alcohols and fatty acids in which some or all of the carbon-carbon unsaturated bonds in unsaturated fatty acids (e.g., oleic acid, palmitoleic acid, vaccenic acid, linoleic acid, linolenic acid, and nervonic acid) have been epoxidized. Examples of the alcohols include monohydric alcohols such as methanol, ethanol, propanol, butanol, and 2-ethylhexanol; and polyhydric alcohols such as glycerin, polyglycerin (diglycerin, etc.), pentaerythritol, ethylene glycol, diethylene glycol, propylene glycol, trimethylolpropane, trimethylolethane, and sugar alcohols. Epoxidized fatty acid esters include, for example, epoxidized soybean oil, epoxidized linseed oil, epoxidized rapeseed fatty acid isobutyl, and epoxidized fatty acid 2-ethylhexyl.

[0075] The phosphate ester compound is preferably a phosphate triester, such as tris(2-ethylhexyl) phosphate, triphenyl phosphate, tritolyl phosphate, isodecyldiphenyl phosphate, t-butylphenyldiphenyl phosphate, and isopropylphenyldiphenyl phosphate.

[0076] The molecular weight of the ester compound is preferably from 200 to 2000, more preferably from 250 to 1500, and even more preferably from 280 to 1000. When the ester compound has a molecular weight distribution, the above molecular weight represents a weight average molecular weight.

[0077] <Alkyldiol> The alkyldiol is a compound in which two hydroxy groups are substituted on an alkane, and is a compound different from the above-mentioned components (cellulose derivative, polyrotaxane, cardanol compound, and ester compound). The alkane may be linear, branched, or cyclic, with linear or branched being preferred, and linear being more preferred. The number of carbon atoms in the alkane is preferably 8 to 20, more preferably 9 to 14, in terms of being able to suppress volatilization of the alkyldiol and achieving excellent compatibility with the cellulose derivative. The substitution positions of the hydroxy groups are not particularly limited, but are preferably substituted at the two terminals of the alkane. Examples of the alkyl diol include 1,9-nonanediol, 1,10-decanediol, 1,2-decanediol, 1,6-decanediol, 1,11-undecanediol, 1,10-undecanediol, 1,12-dodecanediol, 1,2-dodecanediol, 1,13-tridecanediol, 1,14-tetradecanediol, and 1,2-tetradecanediol.

[0078] Among these, in terms of achieving better effects of the present invention, the plasticizer is preferably at least one selected from the group consisting of a cardanol compound, a carboxylic acid ester compound, and an alkyldiol having 9 to 14 carbon atoms, and is more preferably a cardanol compound.

[0079] The plasticizer may be used alone or in combination of two or more. In terms of achieving superior effects of the present invention, the mass ratio of the plasticizer content to the cellulose derivative content is preferably 0.01 to 0.35, more preferably 0.07 to 0.3, and even more preferably 0.1 to 0.2. In terms of achieving superior effects of the present invention, the plasticizer content is preferably 1 to 30 mass%, more preferably 5 to 25 mass%, and even more preferably 10 to 20 mass%, relative to the total mass of the composition.

[0080] [Solvent] It is also preferable that the composition is substantially solvent-free. "Substantially solvent-free" means that the solvent content is less than 0.3% by mass, preferably 0.1% by mass or less, and more preferably 0% by mass, relative to the total mass of the composition. The solvent refers to a component that is liquid at room temperature (25°C) and has a boiling point of less than 100°C at 1 atmosphere (760 mmHg), and examples thereof include known organic solvents. Examples of organic solvents include ester solvents, ketone solvents, ether solvents, alcohol solvents, halogenated hydrocarbon solvents, and hydrocarbon solvents. The solvent content can be measured, for example, by pyrolysis mass spectrometry.

[0081] [Other Components] The composition may contain other components in addition to those described above. Examples of the other components include flame retardants, compatibilizers, oxidation inhibitors, stabilizers, release agents, light resistance agents, weather resistance agents, colorants, pigments, modifiers, anti-drip agents, antistatic agents, hydrolysis inhibitors, fillers, reinforcing materials (glass fiber, carbon fiber, talc, clay, mica, glass flakes, milled glass, glass beads, crystalline silica, alumina, silicon nitride, aluminum nitride, boron nitride, etc.), acid acceptors (metal oxides such as magnesium oxide and aluminum oxide, metal hydroxides such as magnesium hydroxide, calcium hydroxide, aluminum hydroxide, hydrotalcite, calcium carbonate, talc, etc.), and reactive trapping agents (epoxy compounds, acid anhydrides, carbodiimides, etc.).

[0082] The composition may contain other resins different from the cellulose derivative, but the content of the other resins is preferably 5% by mass or less, more preferably less than 1% by mass, and even more preferably 0% by mass (i.e., no other resins are contained) relative to the total mass of the composition. Examples of the other resins include known thermoplastic resins, specifically, for example, polycarbonate resin, polypropylene resin, polyester resin, polyolefin resin, polyester carbonate resin, polyphenylene ether resin, polyphenylene sulfide resin, polysulfone resin, polyether sulfone resin, polyarylene resin, polyetherimide resin, polyacetal resin, polyvinyl acetal resin, polyketone resin, polyether ketone resin, polyether ether ketone resin, polyaryl ketone resin, polyether nitrile resin, liquid crystal resin, polybenzimidazole resin, polypa Examples of the vinyl polymer or copolymer include lavanic acid resin, diene-aromatic alkenyl compound copolymer, vinyl cyanide-diene-aromatic alkenyl compound copolymer, aromatic alkenyl compound-diene-vinyl cyanide-N-phenylmaleimide copolymer, vinyl cyanide-(ethylene-diene-propylene (EPDM))-aromatic alkenyl compound copolymer, vinyl chloride resin, chlorinated vinyl chloride resin, and vinyl polymers or copolymers obtained by polymerizing or copolymerizing one or more vinyl monomers selected from the group consisting of aromatic alkenyl compounds, methacrylic acid esters, acrylic acid esters, and vinyl cyanide compounds.

[0083] [Properties of the Composition] The properties of the composition will be described in detail below.

[0084] <Amorphous> The composition of the present invention is amorphous. In this specification, the term "amorphous" means that the composition does not have a melting point, specifically, that no crystalline melting peak is observed when differential scanning calorimetry (DSC) is performed on the composition using the following method. Using a differential scanning calorimeter (PerkinElmer, DSC4000), the temperature is increased from 30°C to 350°C at a heating rate of 2°C / min, then decreased from 350°C to 30°C at a heating rate of 10°C / min, and then increased again from 30°C to 350°C at a heating rate of 2°C / min to obtain a DSC profile of 10 mg of the composition. The obtained DSC profile is checked for the presence or absence of an endothermic peak during the first heating process. If no peak is present, the composition is amorphous, and if a peak is present, the composition contains crystals (i.e., is crystalline). However, in the DSC profile, peaks whose peak tops are within ±0.8 mW of a straight line connecting the start and end of each temperature increase or decrease process (for example, in the first temperature increase process, a straight line connecting 30°C to 350°C in the first temperature increase process) are noise and are not included in the peaks.

[0085] <Maximum Impact Force> The maximum impact force of the composition is preferably 3600 N or more, more preferably 3700 N or more, even more preferably 3800 N or more, and particularly preferably 4000 N or more. There is no particular upper limit, and it is often 10000 N or less. The maximum impact force of the composition can be measured using the method described in ISO 6603-2:2000. The maximum impact force of the composition can be adjusted, for example, by adjusting the composition of the composition.

[0086] <Energy at Maximum Impact Force> The energy at maximum impact force of the composition is preferably 10 J or more, more preferably 15 J or more, and even more preferably 20 J or more. There is no particular upper limit, and it is often 100 J or less. The energy at maximum impact force of the composition can be measured using the method described in ISO 6603-2:2000. The energy at maximum impact force of the composition can be adjusted, for example, by adjusting the composition of the composition.

[0087] [Molded Article] The molded article of the present invention is a molded article made of the composition of the present invention, i.e., an amorphous molded article containing a cellulose derivative and a polyrotaxane. The molded article is preferably an injection-molded article obtained by injection molding the composition, a blow-molded article obtained by blow molding, or a film-like molded article.

[0088] Examples of methods for forming the molded article include methods of melting and molding the composition, and specific examples of methods that can be used include injection molding, extrusion molding, blow molding, hot press molding, calendar molding, vacuum molding, and transfer molding. Among these, injection molding or blow molding is preferred, and injection molding is more preferred, in terms of the high degree of freedom in shape.

[0089] The cylinder temperature during the injection molding can be adjusted appropriately depending on the composition, and is preferably 160 to 280° C., more preferably 200 to 270° C. The mold temperature during the injection molding can be adjusted appropriately depending on the composition, and is preferably 40 to 90° C., more preferably 40 to 60° C. The injection molding may be performed using commercially available equipment 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 Machinery Co., Ltd.

[0090] It is also preferable that the molded body is substantially free of solvent. Substantially free of solvent means that the solvent content is less than 0.3% by mass, preferably 0.1% by mass or less, and more preferably 0% by mass, based on the total mass of the molded body. The definition and examples of the solvent are as described above. The solvent content can be measured, for example, by pyrolysis mass spectrometry.

[0091] The molded article can be suitably used for applications such as electronic and electrical devices, office supplies, home appliances, automotive interior materials, toys, and containers. Specific applications of the molded article according to this embodiment include housings for electronic and electrical devices or home appliances, various parts for electronic and electrical devices or home appliances, interior and exterior parts for automobiles, building block toys, plastic model kits, storage cases for CD-ROMs or DVDs, tableware, beverage bottles, food trays, wrapping materials, films, sheets, eyeglass frames, and drone housings.

[0092] [Method for Producing Composition] The method for producing the composition is not particularly limited as long as it can produce an amorphous composition. Among these, a method in which a cellulose derivative, a polyrotaxane, and, if necessary, other optional components are mixed and melt-kneaded substantially without a solvent is preferred, as it facilitates the formation of an amorphous composition. Known melt-kneading methods can be used, including, for example, a twin-screw extruder, a Henschel mixer, a Banbury mixer, a single-screw extruder, a multi-screw extruder, and a kneader. In the method for producing the composition, "substantially solvent-free" means that the solvent content is less than 0.3% by mass, preferably 0.1% by mass or less, and more preferably 0% by mass, relative to the total mass of the mixture during kneading. The solvent is intended to be a component that is liquid at room temperature (25°C) and has a boiling point of less than 100°C at 1 atmosphere (760 mmHg), and examples thereof include known organic solvents. Examples of organic solvents include ester solvents, ketone solvents, ether solvents, alcohol solvents, halogenated hydrocarbon solvents, and hydrocarbon solvents.

[0093] The present invention will be described in more detail below with reference to examples. The materials, amounts used, ratios, treatment details, treatment procedures, etc. shown in the following examples can be changed as appropriate without departing from the spirit of the present invention. Therefore, the scope of the present invention should not be construed as being limited by the examples shown below.

[0094] [Preparation of Materials] The following materials were prepared.

[0095] <Cellulose derivatives> CA01: L50, manufactured by Daicel Corporation, cellulose acetate, degree of acetyl substitution 2.4, Mw: 157,000 CA02: CA398-3, manufactured by Eastman Chemical Company, cellulose acetate, degree of acetyl substitution 2.2, Mw: 37,000 CA03: CAP482-20, manufactured by Eastman Chemical Company, cellulose acetate propionate, degree of acetyl substitution 0.18, degree of propionyl substitution 2.4, Mw: 205,000 CA04: CAB381-20, manufactured by Daicel Corporation, cellulose acetate butyrate, degree of acetyl substitution 0.4, degree of butyryl substitution 2.3, Mw: 223,000 CA06: cellulose acetate, acetyl substitution degree 1.75, Mw: 122,000 CA07: cellulose acetate, acetyl substitution degree 1.65, Mw: 118,000 CA08: cellulose acetate, acetyl substitution degree 2.75, Mw: 165,000 CA09: cellulose acetate, acetyl substitution degree 2.85, Mw: 172,000 CA10: cellulose acylate synthesized according to the method described in paragraph

[0092] of JP-A-2009-204834

[0096] The degree of acyl substitution of the cellulose derivative was measured using a measurement sample in a tetrahydrofuran-d8 solvent, tetramethylsilane as a reference substance, a sample concentration of 1% by mass, and a sample tube with a diameter of 5 mm. １ H-NMR (JMN-ECA / JEOL RESONANCE, frequency 500 MHz, number of accumulations 32, measurement temperature 30°C) measurement was performed, and calculation was performed according to the above-mentioned method.

[0097] <Polyrotaxane> PR1: Polyrotaxane (cyclodextrin-unmodified polyrotaxane) synthesized by the following method in accordance with the method described in RSC Adv. 2022, 12, 3796-3800. A mixture of 240 g of (2-hydroxypropyl)-α-cyclodextrin (weight average molecular weight 1,180) and 120 g of amine-terminated polyethylene glycol (number average molecular weight 10,000) dissolved in 1,000 mL of 0.1 mol / L phosphate buffer was refrigerated for 65 hours. The mixture was then returned to room temperature, and 30 g of 3-hydroxyadamantane-1-carboxylic acid and 70 g of 4-(4,6-dimethoxy-1,3,5-triazin-2-yl)-4-methylmorpholinium chloride were added. The mixture was stirred at room temperature for 24 hours, and then 70 g of 4-(4,6-dimethoxy-1,3,5-triazin-2-yl)-4-methylmorpholinium chloride was added and stirred for another 24 hours. The reaction product was then purified by ultrafiltration and freeze-dried to obtain 300 g of PR1. PR2: CELLUM SUPERPOLYMER SH2400P, manufactured by ASM Corporation (a modified polyrotaxane in which cyclodextrin was modified with a caprolactone chain). PR3: a polyrotaxane synthesized according to the method described in paragraph

[0083] of JP 2009-204834 A.

[0098] <Plasticizers> PC1: NX2026, manufactured by Cardrite Co., Ltd., cardanol compound PC2: UL501, manufactured by Cardrite Co., Ltd., cardanol compound PC3: triethyl citrate, manufactured by Fujifilm Shonan Wako Co., Ltd., carboxylic acid ester compound PC4: C-1090, manufactured by Kuraray Co., Ltd., nonanediol PC5: Adeka Cizer O-139P, manufactured by Adeka Corporation, epoxidized soybean oil PC6: TPP, manufactured by Daihachi Chemical Co., Ltd., triphenyl phosphate PC7: dibutyl phosphate

[0099] [Production of Compositions] <Examples 1 to 21 and Comparative Examples 1 and 2> The raw materials shown in Table 1 below were charged into a twin-screw extruder (TEM48SS, manufactured by Shibaura Machine Co., Ltd.) so as to obtain the compositions shown in Table 1, and kneaded at the cylinder temperatures shown in Table 1. Strands were extruded, cooled in a cooling tank, and then cut with a rotary cutter to obtain composition pellets.

[0100] Comparative Example 3 A film was obtained by a solution casting method in accordance with the method described in [Example-1], paragraphs

[0098] to

[0100] of JP-A No. 2009-204834.

[0101] <Confirmation of Amorphousness> The pellets or films of each of the Examples and Comparative Examples prepared by the above-described method were confirmed to be amorphous by the above-described method using a differential scanning calorimeter (DSC4000, manufactured by PerkinElmer).

[0102] [Evaluation] In Examples 1 to 21 and Comparative Examples 1 and 2, the obtained composition pellets were used to mold D2 test pieces (width x length x thickness = 60 x 60 x 2 mm) using an injection molding machine (NEX80, manufactured by Nissei Plastics Co., Ltd.) at a cylinder temperature and mold temperature of 40°C as shown in Table 1. In Comparative Example 3, 30 sheets of the film obtained by the above method were stacked, hot-pressed at 150°C for 1 hour, and cut into a size of width x length x thickness = 60 x 60 x 2 mm to prepare a D2 test piece.

[0103] For each of the obtained D2 test pieces, the maximum impact force (N) and the energy at maximum impact force (J) were measured using a puncture tester (Shimadzu Corporation, Hydroshot HITS-PX) in accordance with ISO 6603-2:2000.

[0104] [Results] Table 1 shows the composition, kneading conditions, and evaluation results of each composition. In Table 1, the column "(B) / (A)" shows the mass ratio of the content of polyrotaxane (B) to the content of cellulose derivative (A). In Table 1, the column "Amorphous" indicates that compositions confirmed to be amorphous in the above-mentioned <Confirmation of Amorphousness> are marked as "Amorphous," and compositions confirmed to have a crystalline melting peak are marked as "Crystalline."

[0105]

[0106] From the results shown in Table 1, it was confirmed that the composition of the present invention is excellent in maximum impact force and energy at maximum impact force, that is, excellent in dart impact strength.

[0107] A comparison of Examples 1 to 8 confirmed that dart impact strength was superior when the acyl substitution degree was 1.7 to 2.6. A comparison of Example 1 with Example 10 confirmed that dart impact strength was superior when the cyclic molecules of the polyrotaxane did not have side chains. A comparison of Example 1 with Examples 10 to 12, and a comparison of Example 7 with Example 21 confirmed that dart impact strength was superior when the mass ratio of the polyrotaxane content to the cellulose derivative content was 0.10 or less. A comparison of Examples 13 to 18 confirmed that dart impact strength was superior when the plasticizer was at least one selected from the group consisting of cardanol compounds, carboxylic acid ester compounds, and alkyl diols having 9 to 14 carbon atoms, and that dart impact strength was even superior when the plasticizer was a cardanol compound. A comparison of Example 13 with Examples 19 and 20 confirmed that dart impact strength was superior when the plasticizer content was 10 to 20 mass% relative to the total mass of the composition.

[0108] [Evaluation of Biodegradability] Using the composition pellets of Example 1 and Example 15, biodegradability was evaluated according to the following procedure. 100 g of the composition pellets were pulverized using a Labo Mill (Dalton, Labo Mill LM-05) while adding liquid nitrogen, and then sieved through a 100 μm mesh sieve, and 30 g of the powder that passed through the sieve was collected. Using the obtained composition powder, the weight loss rate (compost decomposition rate) after 28 days was measured according to a method in accordance with ISO-14855 to evaluate biodegradability. As a result, the weight loss rate of Example 1 was 56%, and the weight loss rate of Example 15 was 82%, indicating biodegradability in both cases. In other words, it was confirmed that the composition of the present invention has excellent dart impact strength and exhibits biodegradability.

Claims

1. A composition comprising a cellulose derivative and a polyrotaxane, the composition being amorphous.

2. The composition according to claim 1, wherein the cellulose derivative is cellulose acylate.

3. The composition according to claim 2, wherein the acyl substitution degree of the cellulose acylate is from 1.7 to 2.

6.

4. The composition according to claim 1, wherein the cellulose derivative is at least one selected from the group consisting of cellulose acetate, cellulose acetate propionate, and cellulose acetate butyrate.

5. The composition of claim 1, wherein the cellulose derivative is cellulose acetate.

6. The composition according to claim 5, wherein the acetyl substitution degree of the cellulose acetate is from 1.7 to 2.

6.

7. The composition of claim 1, further comprising a plasticizer.

8. The composition according to claim 7, wherein the plasticizer is at least one selected from the group consisting of a cardanol compound, a carboxylic acid ester compound, and an alkyldiol having 9 to 14 carbon atoms.

9. The composition according to claim 1, wherein the mass ratio of the content of the polyrotaxane to the content of the cellulose derivative is 0.10 or less.

10. A molded article comprising the composition according to any one of claims 1 to 9.

11. The molded article according to claim 10, having a maximum impact force of 4000 N or more.

12. A method for producing an amorphous composition comprising a cellulose derivative and a polyrotaxane, the method comprising the step of melt-kneading the cellulose derivative and the polyrotaxane in the substantial absence of a solvent.