JP6705343B2 - Resin composition and resin molding - Google Patents

Description

The present invention relates to a resin composition and a resin molded product.

Conventionally, various types of thermoplastic resins have been provided and used for various purposes. For example, thermoplastic resins are used for home appliances, various parts such as automobiles, office equipment, and housings for electronic and electrical equipment.
In recent years, plant-derived resins have been used as thermoplastic resins, and cellulose acylate is one of the conventionally known plant-derived resins.

For example, in Patent Document 1, "a cellulose ester resin, a non-reactive plasticizer having no functional group capable of reacting with the cellulose ester resin, and a polyolefin obtained by polymerizing an olefin having 2 to 4 carbon atoms as a main component are described. A resin composition containing at least a polyolefin-containing polyfunctional elastomer having a plurality of functional groups capable of reacting with the cellulose ester resin."

In addition, in Patent Document 2, “(A) 2 to 100 parts by mass of a plasticizer, and (C) a thermoplastic resin having a core-shell structure containing a (meth)acrylic acid alkyl ester unit relative to 100 parts by mass of a cellulose ester. Cellulose ester composition containing 1 to 50 parts by weight of elastomer."

JP, 2016-069397, A JP, 2014-084343, A

The problem to be solved by the present invention is to provide a cellulose acylate having a weight average molecular weight of 30,000 or more and 90,000 or less, and an olefin-(meth)acrylate-(unsaturated-1,2-dicarboxylic acid anhydride) copolymer. In the resin composition to be contained, the mass ratio Ma of the content Ma of the structural unit represented by the following formula (a) and the content Mb of the structural unit represented by the following formula (b) contained in the copolymer. It is an object of the present invention to provide a resin composition which is excellent in impact resistance and has a high flexural modulus as compared with the case where /Mb is less than 1 or exceeds 100.

The above problems can be solved by the following means.

The invention according to claim 1 is
Of the cellulose acylate having a weight average molecular weight of 30,000 or more and 90,000 or less, and the content Ma of the constitutional unit represented by the following formula (a) contained in the copolymer and the constitutional unit represented by the following formula (b) A resin composition containing an olefin-(meth)acrylate-(unsaturated-1,2-dicarboxylic acid anhydride) copolymer having a mass ratio Ma/Mb with the content Mb of 1 or more and 100 or less.

In the formula, R ¹ represents a hydrogen atom or a methyl group, R ² represents an alkyl group having 1 to 10 carbon atoms, and R ³ and R ⁴ each independently represent a hydrogen atom or alkyl having 1 to 10 carbon atoms. Represents a group.

The invention according to claim 2 is
The olefin-(meth)acrylate-(unsaturated-1,2-dicarboxylic acid anhydride) copolymer is an ethylene-(meth)acrylate-(unsaturated-1,2-dicarboxylic acid anhydride) copolymer. The resin composition according to claim 1.

The invention according to claim 3 is
The olefin-(meth)acrylate-(unsaturated-1,2-dicarboxylic acid anhydride) copolymer is an olefin-(meth)acrylate-maleic anhydride copolymer. The resin composition of

The invention according to claim 4 is
4. The resin composition according to claim 1, wherein the substitution degree of the cellulose acylate is 2.0 or more and 2.5 or less.

The invention according to claim 5 is
The resin composition according to any one of claims 1 to 4, wherein the cellulose acylate has at least an acetyl group.

The invention according to claim 6 is
The resin composition according to any one of claims 1 to 5, wherein the content of the copolymer is 0.5 part by mass or more and 10 parts by mass or less with respect to 100 parts by mass of the cellulose acylate. is there.

The invention according to claim 7 is
The resin composition according to claim 1, further comprising an adipic acid ester-containing compound.

The invention according to claim 8 is
A resin molded product obtained by molding the resin composition according to any one of claims 1 to 7.

The invention according to claim 9 is
Of the cellulose acylate having a weight average molecular weight of 30,000 or more and 90,000 or less, and the content Ma of the constitutional unit represented by the following formula (a) contained in the copolymer and the constitutional unit represented by the following formula (b) Resin molding containing a resin formed by reacting an olefin-(meth)acrylate-(unsaturated-1,2-dicarboxylic acid anhydride) copolymer having a mass ratio Ma/Mb with the content Mb of 1 or more and 100 or less. It is the body.

In the formula, R ¹ represents a hydrogen atom or a methyl group, R ² represents an alkyl group having 1 to 10 carbon atoms, and R ³ and R ⁴ each independently represent a hydrogen atom or alkyl having 1 to 10 carbon atoms. Represents a group.

The invention according to claim 10 is
The olefin-(meth)acrylate-(unsaturated-1,2-dicarboxylic acid anhydride) copolymer is an ethylene-(meth)acrylate-(unsaturated-1,2-dicarboxylic acid anhydride) copolymer. It is the resin molding according to claim 9.

The invention according to claim 11 is
The olefin-(meth)acrylate-(unsaturated-1,2-dicarboxylic acid anhydride) copolymer is an olefin-(meth)acrylate-maleic anhydride copolymer. It is a resin molding of.

According to the invention of claim 1, a cellulose acylate having a weight average molecular weight of 30,000 or more and 90,000 or less and an olefin-(meth)acrylate-(unsaturated-1,2-dicarboxylic acid anhydride) copolymer are used. In the resin composition to be contained, the mass ratio Ma of the content Ma of the structural unit represented by the formula (a) and the content Mb of the structural unit represented by the formula (b) contained in the copolymer. There is provided a resin composition which is excellent in impact resistance and has a high flexural modulus as compared with the case where /Mb is less than 1 or exceeds 100.
According to the invention of claim 2, compared with the case where the copolymer is an olefin-(meth)acrylate-(unsaturated-1,2-dicarboxylic anhydride) copolymer other than ethylene, impact resistance is improved. Provided is a resin composition which is more excellent in properties and can obtain a resin molded body having a higher flexural modulus.
According to the invention of claim 3, as compared with the case where the copolymer is an (unsaturated-1,2-dicarboxylic acid anhydride) copolymer other than olefin-(meth)acrylate-maleic anhydride, Provided is a resin composition which is more excellent in impact resistance and can obtain a resin molded body having a higher flexural modulus.
According to the invention according to claim 4, a resin composition capable of obtaining a resin molded product having more excellent impact resistance as compared with the case where the substitution degree of cellulose acylate is less than 2.0 or exceeds 2.5. Will be provided.
According to the invention of claim 5, as compared with the case where the mass ratio Ma/Mb in the copolymer is less than 1 or exceeds 100, cellulose acetate is contained as the cellulose acylate and impact resistance is improved. Further, a resin composition which is more excellent and can obtain a resin molded product having a higher flexural modulus is provided.
According to the invention of claim 6, the content of the copolymer is less than 0.5 parts by mass or more than 10 parts by mass with respect to 100 parts by mass of the cellulose acylate, Provided is a resin molded body that can be obtained with a resin molded body that is more excellent in impact resistance.
According to the invention of claim 7, as compared with the case where the mass ratio Ma/Mb in the copolymer is less than 1 or exceeds 100, it contains an adipic acid ester-containing compound and is molded at the time of resin molding. Provided is a resin composition which is excellent in properties and is capable of obtaining a resin molded product having excellent impact resistance.

According to the invention of claim 8, a cellulose acylate having a weight average molecular weight of 30,000 or more and 90,000 or less and an olefin-(meth)acrylate-(unsaturated-1,2-dicarboxylic acid anhydride) copolymer are used. In the resin composition to be contained, the mass ratio Ma of the content Ma of the structural unit represented by the formula (a) and the content Mb of the structural unit represented by the formula (b) contained in the copolymer. As compared with the case where a resin composition having a /Mb of less than 1 or more than 100 is used, a resin molded article having excellent impact resistance and a high flexural modulus is provided.

According to the invention of claim 9, a cellulose acylate having a weight average molecular weight of 30,000 or more and 90,000 or less, and an olefin-(meth)acrylate-(unsaturated-1,2-dicarboxylic acid anhydride) copolymer are provided. In a resin molded product containing a resin obtained by reaction, the content Ma of the structural unit represented by the formula (a) and the content Mb of the structural unit represented by the formula (b) contained in the copolymer. A resin molding having excellent impact resistance and a high flexural modulus is provided as compared with the case where a resin composition having a mass ratio Ma/Mb of less than 1 or more than 100 is used.
According to the invention of claim 10, impact resistance is improved as compared with the case where the copolymer is an olefin-(meth)acrylate-(unsaturated-1,2-dicarboxylic acid anhydride) copolymer other than ethylene. Provided is a resin molded body which is more excellent in flexibility and has a higher flexural modulus.
According to the invention of claim 11, as compared with the case where the copolymer is an (unsaturated-1,2-dicarboxylic acid anhydride) copolymer other than olefin-(meth)acrylate-maleic anhydride, Provided is a resin molded body having a higher impact resistance and a higher flexural modulus.

Hereinafter, an embodiment that is an example of the present invention will be described.

[Resin composition]
The resin composition according to the present embodiment includes a cellulose acylate having a weight average molecular weight of 30,000 or more and 90,000 or less, and a content Ma of a structural unit represented by the following formula (a) contained in the copolymer and the following formula. Olefin-(meth)acrylate-(unsaturated-1,2-dicarboxylic acid anhydride) copolymer whose mass ratio Ma/Mb with the content Mb of the structural unit represented by (b) is 1 or more and 100 or less. including.

In the formula, R ¹ represents a hydrogen atom or a methyl group, R ² represents an alkyl group having 1 to 10 carbon atoms, and R ³ and R ⁴ each independently represent a hydrogen atom or alkyl having 1 to 10 carbon atoms. Represents a group.

The resin composition according to the present embodiment has the above-mentioned configuration, and thus a resin molded article having excellent impact resistance and a high flexural modulus can be obtained. The reason is presumed as follows.

Cellulose has a rigid chemical structure, and has an extremely high elastic modulus and heat resistance because it has a strong intramolecular and intermolecular hydrogen bonding force. However, it has almost no thermal fluidity, and therefore is not used as a plastic as much.
Therefore, by adding a substituent (particularly, an acyl group) to cellulose, plasticity is imparted, and the melting temperature is lowered to improve the heat fluidity, so that it can be used as a plastic.

Cellulose acylate emits essentially no CO ₂ and exhibits excellent environmental performance. However, when it is used for housings such as copying machines and home electric appliances, there is a problem that the intramolecular and intermolecular hydrogen bonds in the cellulose acylate are strong and the rigidity is high, but the impact resistance is low.
In Patent Document 1, 2-100 parts by mass of a plasticizer and 100% by mass of a cellulose ester such as cellulose acylate, and a thermoplastic elastomer 1-50 having a core-shell structure containing an alkyl (meth)acrylate unit are included. Although the impact resistance strength is improved by including the mass part, the rigidity which is the original strength, specifically, the bending elastic modulus is significantly reduced.

In the present embodiment, even when cellulose acylate is used, it has been possible to improve the impact strength and to secure a high bending elastic modulus, which is an original characteristic. Specifically, a cellulose acylate having a weight average molecular weight of 30,000 or more and 90,000 or less, and the content Ma of the structural unit represented by the following formula (a) contained in the copolymer and the following formula (b) Composition containing an olefin-(meth)acrylate-(unsaturated-1,2-dicarboxylic acid anhydride) copolymer having a mass ratio Ma/Mb of 1 to 100 inclusive with the content Mb of the constituent unit As a result, a resin molding having excellent impact resistance and a high flexural modulus can be obtained.
The hydroxyl group or ester group of the cellulose acylate reacts with the maleic anhydride structure in the copolymer to form a bulky structure having a side chain containing the structural unit represented by the formula (a). Therefore, the hydrogen bonding force is relaxed and the impact strength is improved.
However, when the side chains become bulky, the flexural modulus, which is a characteristic of cellulose acylate, usually decreases.
Therefore, a cellulose acylate having a weight average molecular weight of 30,000 or more and 90,000 or less and a lower molecular weight than before, and an olefin-(meth)acrylate-(unsaturated-1,2) having the mass ratio Ma/Mb of 1 or more and 100 or less. -Dicarboxylic acid anhydride) by using a copolymer, the hydroxyl group at the terminal of the molecule also reacts with the maleic anhydride structure, and the molecular chain extension, bulkiness of the side chain, and the amount of hydrogen bonds are in an appropriate balance. It is possible to obtain a resin molded product having excellent impact resistance while maintaining the flexural modulus.
When the weight average molecular weight of cellulose acylate is less than 30,000, the molecular chain extension is insufficient and the flexural modulus decreases. On the other hand, when the weight average molecular weight of cellulose acylate exceeds 90,000, the reaction probability between the molecular end and the maleic anhydride structure becomes low, and the flexural modulus decreases.
Furthermore, if the mass ratio Ma/Mb of the copolymer is less than 1, the reaction between the cellulose acylate and the copolymer proceeds too much, which lowers the hydrogen bonding property, resulting in a bending elastic modulus. Is reduced. Further, when the mass ratio Ma/Mb of the copolymer exceeds 100, the copolymer reacting decreases and the impact strength becomes insufficient.

Hereinafter, details of the resin composition according to the present embodiment will be described.

<Cellulose acylate>
The resin composition according to the present embodiment contains a cellulose acylate having a weight average molecular weight of 30,000 or more and 90,000 or less.

The cellulose acylate used in the present embodiment is preferably a cellulose acylate having a weight average molecular weight of 30,000 or more and 90,000 or less and a substitution degree of 2.0 or more and 2.5 or less. Cellulose acylate having this property has a low melting temperature and high transparency. When a cellulose acylate having the above characteristics is used in a resin molded product, a resin molded product having high moldability (for example, high injection moldability) and excellent impact resistance can be obtained.
However, the properties of the cellulose acylate used in the present embodiment are not limited to the above properties except that the weight average molecular weight is 30,000 or more and 90,000 or less, and are selected according to the purpose of use of the cellulose acylate.

The cellulose acylate used in the present embodiment has a weight average molecular weight of 30,000 or more and 90,000 or less, preferably 40,000 or more and 90,000 or less, and more preferably 60,000 or more and 90,000 from the viewpoint of impact resistance of the obtained resin molded product. The following is more preferable.

The weight average molecular weight of the cellulose acylate in the present embodiment is measured by the following method.
Using a dimethylacetamide/lithium chloride=90/10 solution, a gel permeation chromatography device (GPC device: manufactured by Tosoh Corp., HLC-8320GPC, column: TSKgel α-M) is used to measure polystyrene.

The degree of polymerization of the cellulose acylate according to the present embodiment is preferably 100 or more and 350 or less, and more preferably 150 or more and 350 or less, from the viewpoint of the melting temperature reduction (improvement of moldability) and the impact resistance of the obtained resin molding. It is preferably 200 or more and 350 or less.

Here, the degree of polymerization is determined from the weight average molecular weight by the following procedure.
First, the weight average molecular weight of cellulose acylate is measured by the above method.
Then, the degree of polymerization of cellulose acylate is obtained by dividing the molecular weight of the constituent unit of cellulose acylate. In addition, for example, when the substituent of cellulose acylate is an acetyl group, the constitutional unit molecular weight is 263 when the degree of substitution is 2.4 and 284 when the degree of substitution is 2.9.

The degree of substitution of the cellulose acylate according to the present embodiment is 2.0 or more and 2.5 or less from the viewpoint of reduction of melting temperature (improvement of moldability), impact resistance and flexural modulus of the obtained resin molding. It is preferably 2.1 or more and 2.5 or less, more preferably 2.2 or more and 2.5 or less.

Here, the degree of substitution is an index indicating the degree to which the hydroxyl group of cellulose is substituted with an acyl group. That is, the degree of substitution is an index showing the degree of acylation of cellulose acylate. Specifically, the degree of substitution means the intramolecular average of the number of substitutions in which three hydroxyl groups in the D-glucopyranose unit of cellulose acylate are substituted with acyl groups.
The degree of substitution is measured by ¹ H-NMR (manufactured by JMN-ECA/JEOL RESONANCE) from the integral ratio of the cellulose-derived hydrogen and the acyl group-derived peak.

The acyl group contained in the cellulose acylate used in the present embodiment is not particularly limited, but from the viewpoint of impact resistance and flexural modulus of the obtained molded product, a linear or branched carbon number of 1 or more. It is preferably an acyl group having 6 or less, and it is at least one acyl group selected from the group consisting of a formyl group, an acetyl group, a propionyl group, a butyroyl group, a 2-methylpropionyl group, and a pentanoyl group. More preferably, it is at least one kind of acyl group selected from the group consisting of an acetyl group and a propionyl group, still more preferably, and an acetyl group is particularly preferable.
The cellulose acylate used in the embodiment may have one type of acyl group or two or more types of acyl groups.

Specific examples of the cellulose acylate used in the present embodiment include cellulose acetate, cellulose propionate, cellulose butyrate, cellulose acetate propionate, and cellulose acetate butyrate.

The cellulose acylate used in this embodiment may be used alone or in combination of two or more.
The content of cellulose acylate in the resin composition according to the present embodiment is 50 mass% or more and 99.9 mass% or more based on the total mass of the resin composition from the viewpoint of impact resistance and flexural modulus of the obtained resin molded product. It is preferably not more than mass%, more preferably not less than 65 mass% and not more than 99.8 mass%, particularly preferably not less than 75 mass% and not more than 99.5 mass%.

In the resin composition according to this embodiment, it is presumed that the cellulose acylate and the copolymer are partially reacted, although not in the total amount.
The content of cellulose acylate includes not only the amount of unreacted cellulose acylate but also the amount of cellulose acylate component in the reacted resin.
Further, the resin composition according to the present embodiment preferably contains a resin obtained by reacting the cellulose acylate with the copolymer.

The method for producing the cellulose acylate used in this embodiment is not particularly limited, and for example, cellulose is subjected to acylation and molecular weight reduction (depolymerization), and, if necessary, deacylation. It is preferably manufactured by the method. Further, commercially available cellulose acylate may be produced by lowering the molecular weight (depolymerization) or the like so that the weight average molecular weight becomes the above-mentioned.

<Olefin-(meth)acrylate-(unsaturated-1,2-dicarboxylic acid anhydride) copolymer>
The resin composition according to the present embodiment includes an olefin-(meth)acrylate-(unsaturated-1,2-dicarboxylic acid anhydride) copolymer, and the copolymer is represented by the following formula (a). And a structural unit represented by the following formula (b), the content Ma of the structural unit represented by the following formula (a) in the copolymer, and a constitution represented by the following formula (b). The mass ratio Ma/Mb to the unit content Mb is 1 or more and 100 or less.

In the formula, R ¹ represents a hydrogen atom or a methyl group, R ² represents an alkyl group having 1 to 10 carbon atoms, and R ³ and R ⁴ each independently represent a hydrogen atom or alkyl having 1 to 10 carbon atoms. Represents a group.

The constitutional unit represented by the formula (a) is preferably a constitutional unit derived from (meth)acrylate.
R ¹ in formula (a) is preferably a hydrogen atom.
R ² in the formula (a) is preferably an alkyl group having 1 to 6 carbon atoms, and an alkyl group having 1 to 4 carbon atoms, from the viewpoint of impact resistance and flexural modulus of the obtained resin molding. Is more preferable, a methyl group or an ethyl group is further preferable, and a methyl group is particularly preferable.
The alkyl group for R ² may be a linear alkyl group or a branched alkyl group.

The copolymer may have one type of structural unit represented by formula (a) alone or may have two or more types.
The content of the structural unit represented by the formula (a) in the copolymer is 1% by mass or more and 40% by mass or less based on the total mass of the copolymer from the viewpoint of impact resistance of the obtained resin molded product. It is preferably at most 2% by mass and at most 35% by mass, more preferably at least 5% by mass and at most 30% by mass.

The constitutional unit represented by the formula (b) is preferably a constitutional unit derived from unsaturated -1,2-dicarboxylic acid anhydride.
From the viewpoint of impact resistance of the obtained resin molded product, at least one of R ³ and R ⁴ in the formula (b) is preferably a hydrogen atom, and both R ³ and R ⁴ are both hydrogen atoms. Is particularly preferable.
The alkyl group in R ³ and R ⁴ of the formula (b) is preferably an alkyl group having 1 to 6 carbon atoms, and 1 to 4 carbon atoms, from the viewpoint of impact resistance of the obtained resin molded product. An alkyl group is more preferable, a methyl group or an ethyl group is further preferable, and a methyl group is particularly preferable.
Further, the alkyl group for R ³ and R ⁴ may be a linear alkyl group or a branched alkyl group. Further, R ³ and R ⁴ may combine to form a ring structure. The ring structure is preferably a 5-membered ring structure or a 6-membered ring structure.

The copolymer may have one type of structural unit represented by formula (b) alone, or may have two or more types.
The content of the structural unit represented by the formula (b) in the copolymer is 0.1% by mass or more and 10% by mass or more with respect to the total mass of the copolymer from the viewpoint of impact resistance of the obtained resin molded product. It is preferably not more than 0.3% by mass, more preferably not less than 0.3% by mass and not more than 6.5% by mass, and particularly preferably not less than 1.0% by mass and not more than 5.0% by mass.

The mass ratio Ma/Mb between the content Ma of the structural unit represented by the formula (a) and the content Mb of the structural unit represented by the formula (b) in the copolymer is 1 or more and 100 or less. From the viewpoint of impact resistance and flexural modulus of the obtained resin molded product, it is preferably 1 or more and 50 or less, more preferably 1 or more and 30 or less, and 1.5 or more and 10 or less. More preferable.

The copolymer has a structural unit derived from an olefin.
The olefin to be copolymerized with the copolymer is preferably an aliphatic hydrocarbon compound having an ethylenically unsaturated group, and is at least one compound selected from the group consisting of ethylene and α-olefin. Is more preferable, at least one compound selected from the group consisting of ethylene and propylene is more preferable, and ethylene is particularly preferable.
Further, it is preferable that the copolymer has a structural unit represented by the following formula (c) as the structural unit derived from the olefin.

In the formula, R ⁵ represents a hydrogen atom or an alkyl group having 1 to 8 carbon atoms.

R ⁵ in the formula (c) is preferably a hydrogen atom or an alkyl group having 1 to 6 carbon atoms, and a hydrogen atom or a methyl group, from the viewpoint of impact resistance and flexural modulus of the obtained resin molding. It is more preferable that they are present, and it is particularly preferable that they be hydrogen atoms.
The alkyl group for R ⁵ may be a linear alkyl group or a branched alkyl group, but is preferably a linear alkyl group.

The copolymer may have one kind of the structural unit represented by the formula (c) alone or may have two or more kinds.
The content of the structural unit represented by the formula (c) in the copolymer is 50% by mass or more and 98.9% with respect to the total mass of the copolymer from the viewpoint of the impact resistance of the obtained resin molded product. It is preferably not more than 60% by mass, more preferably not less than 60% by mass and not more than 95% by mass, and particularly preferably not less than 65% by mass and not more than 92% by mass.

The copolymer may have a constitutional unit other than the constitutional units represented by the formulas (a) to (c), but it is preferable not to have the constitutional units.
The monomer that forms the other structural unit is not particularly limited, and examples thereof include known ethylenically unsaturated compounds other than those mentioned above.
Specific examples of the monomer that forms another structural unit include a styrene compound, a vinyl ether compound, a vinyl ester compound, and a (meth)acrylate compound other than the above.

The above-mentioned copolymer may have one kind of other constitutional unit alone, or may have two or more kinds thereof.
The content of the other structural unit in the copolymer is preferably 10% by mass or less, more preferably 5% by mass or less, and more preferably 1% by mass or less, based on the total mass of the copolymer. It is more preferable that there is no other structural unit.

The copolymer is preferably an olefin-(meth)acrylate-(unsaturated-1,2-dicarboxylic acid anhydride) terpolymer.
The copolymer is a copolymer composed of a constitutional unit represented by the formula (a), a constitutional unit represented by the formula (b), and a constitutional unit represented by the formula (c). Is preferred.

The structure of the terminal of the copolymer is not particularly limited and may form various groups depending on the reaction conditions and the type of the reaction terminator, but a hydrogen atom, a hydroxy group, an ethylenically unsaturated group, an alkoxy group. , And an alkylthio group.

The weight average molecular weight Mw of the copolymer is preferably 5,000 or more and 200,000 or less, and preferably 10,000 or more and 100,000 or less from the viewpoint of impact resistance and flexural modulus of the obtained resin molded product. Is more preferable.

The copolymers used in this embodiment may be used alone or in combination of two or more.
The content of the copolymer in the resin composition according to the present embodiment is 0.1 parts by mass with respect to 100 parts by mass of the cellulose acylate from the viewpoint of impact resistance and flexural modulus of the obtained resin molded product. The amount is preferably 20 parts by mass or more, more preferably 0.5 parts by mass or more and 10 parts by mass or less, and particularly preferably 1 part by mass or more and 8 parts by mass or less.

The resin composition according to this embodiment may include a plasticizer, other components, and the like, if necessary.

<Plasticizer>
The resin composition according to the present embodiment preferably contains a plasticizer from the viewpoint of moldability and impact resistance of the obtained resin molded product.
Further, the resin composition according to the present embodiment preferably does not contain a plasticizer from the viewpoint of the flexural modulus of the obtained resin molded body.
Examples of the plasticizer include adipic acid ester-containing compounds, polyether ester compounds, sebacic acid ester compounds, glycol ester compounds, acetic acid esters, dibasic acid ester compounds, phosphoric acid ester compounds, phthalic acid ester compounds, camphor, citric acid. Examples thereof include esters, stearic acid esters, metal soaps, polyols and polyalkylene oxides.
Among these, adipic acid ester-containing compounds and polyether ester compounds are preferable, and adipic acid ester-containing compounds are more preferable.

-Adipic acid ester-containing compound-
The adipic acid ester-containing compound (compound containing adipic acid ester) is a compound of adipic acid ester alone or a mixture of adipic acid ester and a component other than adipic acid ester (a compound different from adipic acid ester). Indicates. However, the adipic acid ester-containing compound preferably contains the adipic acid ester in an amount of 50% by mass or more based on all components.

Examples of the adipic acid ester include adipic acid diester and adipic acid polyester. Specific examples include adipic acid diester represented by the following general formula (AE-1) and adipic acid polyester represented by the following general formula (AE-2).

In the general formula (AE1) and ^{(AE2), R AE1} and ^{R AE2} are each independently an alkyl group, or polyoxyethylene group _{[- (C x H 2X -O} ) y -R A1] ( However, R ^A1 represents an alkyl group, x represents an integer of 1 or more and 10 or less, and y represents an integer of 1 or more and 10 or less).
R ^AE3 represents an alkylene group.
m1 represents an integer of 1 or more and 20 or less.
m2 represents an integer of 1 or more and 10 or less.

In formulas (AE-1) and (AE-2), the alkyl group represented by R ^AE1 and R ^AE2 is preferably an alkyl group having 1 to 6 carbon atoms, and more preferably an alkyl group having 1 to 4 carbon atoms. .. The alkyl group represented by R ^AE1 and R ^AE2 may be linear, branched or cyclic, but is preferably linear or branched.
In the general formula (AE1) and ^(AE2), polyoxyethylene alkyl ^{group R AE1} and ^{R AE2} represents - in _{[(C x H 2X -O)} y -R A1], the alkyl group represented by ^{R A1} is An alkyl group having 1 to 6 carbon atoms is preferable, and an alkyl group having 1 to 4 carbon atoms is more preferable. The alkyl group represented by R ^A1 may be linear, branched or cyclic, but is preferably linear or branched.

In general formula (AE-2), the alkylene group represented by R ^AE3 is preferably an alkylene group having 1 to 6 carbon atoms, and more preferably an alkylene group having 1 to 4 carbon atoms. The alkylene group may be linear, branched or cyclic, but is preferably linear or branched.

In general formulas (AE-1) and (AE-2), the group represented by each symbol may be substituted with a substituent. Examples of the substituent include an alkyl group, an aryl group, a hydroxyl group and the like.

The molecular weight (or weight average molecular weight) of the adipic acid ester is preferably 200 or more and 5000 or less, and more preferably 300 or more and 2000 or less. The weight average molecular weight is a value measured according to the above-mentioned method for measuring the weight average molecular weight of cellulose acylate.

Specific examples of the adipic acid ester-containing compound will be shown below, but the invention is not limited thereto.

-Polyether ester compound-
Specific examples of the polyether ester compound include a polyether ester compound represented by the general formula (EE).

In formula (EE), R ^EE1 and R ^EE2 each independently represent an alkylene group having 2 to 10 carbon atoms. A ^EE1 and A ^EE2 each independently represent an alkyl group having 1 to 6 carbon atoms, an aryl group having 6 to 12 carbon atoms, or an aralkyl group having 7 to 18 carbon atoms. m represents an integer of 1 or more.

In general formula (EE), the alkylene group represented by R ^EE1 is preferably an alkylene group having 3 to 10 carbon atoms, and more preferably an alkylene group having 3 to 6 carbon atoms. The alkylene group represented by R ^EE1 may be linear, branched or cyclic, but is preferably linear.
When the number of carbon atoms of the alkylene group represented by R ^EE1 is 3 or more, deterioration of fluidity of the resin composition is suppressed, and thermoplasticity is easily exhibited. When the alkylene group represented by R ^EE1 has 10 or less carbon atoms or the alkylene group represented by R ^EE1 is linear, the affinity with the cellulose acylate is likely to increase. Therefore, when the alkylene group represented by R ^EE1 is linear and the carbon number is within the above range, the moldability of the resin composition is improved.
From these viewpoints, in particular, the alkylene group represented by R ^EE1 is preferably an n-hexylene group (—(CH ₂ ) ₆ —). In other words, a polyether ester ^compound, as ^{R EE1} n-hexylene _{(- (CH 2) 6 -} ) is preferably a compound represented the.

In general formula (EE), the alkylene group represented by R ^EE2 is preferably an alkylene group having 3 to 10 carbon atoms, and more preferably an alkylene group having 3 to 6 carbon atoms. The alkylene group represented by R ^EE2 may be linear, branched or cyclic, but is preferably linear.
When the number of carbon atoms of the alkylene group represented by R ^EE2 is 3 or more, deterioration of fluidity of the resin composition is suppressed, and thermoplasticity is easily exhibited. If the alkylene group represented by R ^EE2 has 10 or less carbon atoms or the alkylene group represented by R ^EE2 is linear, the affinity with the cellulose acylate tends to increase. Therefore, when the alkylene group represented by R ^EE2 is linear and the carbon number is within the above range, the moldability of the resin composition is improved.
From these viewpoints, in ^particular, alkylene ^{group R EE2} represent may, n- butylene _{(- (CH 2) 4 -} ) is preferred. In other words, a polyether ester ^compound, as ^{R EE2} n-butylene _{(- (CH 2) 4 -} ) is preferably a compound represented the.

In formula (EE), the alkyl groups represented by A ^EE1 and A ^EE2 are alkyl groups having 1 to 6 carbon atoms, and more preferably 2 to 4 carbon atoms. The alkyl group represented by A ^EE1 and A ^EE2 may be linear, branched or cyclic, but is preferably branched.
The aryl group represented by A ^EE1 and A ^EE2 is an aryl group having 6 to 12 carbon atoms, which is an unsubstituted aryl group such as a phenyl group and a naphthyl group, or a substituted phenyl group such as a t-butylphenyl group and a hydroxyphenyl group. Groups.
A ^EE1, and aralkyl group represented by ^{A EE2,} a group represented by -R A -Ph. ^RA represents a linear or branched alkylene group having 1 to 6 carbon atoms (preferably 2 to 4 carbon atoms). Ph represents an unsubstituted phenyl group or a substituted phenyl group substituted with a linear or branched alkyl group having 1 to 6 carbon atoms (preferably 2 to 6 carbon atoms). Specific examples of the aralkyl group include, for example, an unsubstituted aralkyl group such as a benzyl group, a phenylmethyl group (phenethyl group), a phenylpropyl group and a phenylbutyl group, or a substitution such as a methylbenzyl group, a dimethylbenzyl group and a methylphenethyl group. An aralkyl group may be mentioned.

At least one of A ^EE1 and A ^EE2 preferably represents an aryl group or an aralkyl group. In other words, a polyether ester ^{compound, A EE1,} and preferably (preferably a phenyl group) an aryl group as at least one of ^{A EE2} is a compound represented or aralkyl ^{group, A EE1,} and aryl groups as both ^{A EE2} ( A compound which preferably represents a phenyl group) or an aralkyl group is preferable.

Next, the characteristics of the polyether ester compound will be described.

The weight average molecular weight (Mw) of the polyether ester compound is preferably 450 or more and 650 or less, and more preferably 500 or more and 600 or less.
If the weight average molecular weight (Mw) is 450 or more, bleeding (precipitation phenomenon) becomes difficult. When the weight average molecular weight (Mw) is 650 or less, affinity with cellulose acylate is likely to increase. Therefore, when the weight average molecular weight (Mw) is within the above range, the moldability of the resin composition is improved.
The weight average molecular weight (Mw) of the polyether ester compound is a value measured by gel permeation chromatograph (GPC). Specifically, for the molecular weight measurement by GPC, Tosoh Corporation's HPLC1100 is used as a measuring device, and Tosoh's column TSKgel GMHHR-M+TSKgel GMHHR-M (7.8 mm ID 30 cm) is used. , Chloroform solvent. Then, the weight average molecular weight is calculated from the measurement result using a molecular weight calibration curve prepared from a monodisperse polystyrene standard sample.

The viscosity at 25° C. of the polyether ester compound is preferably 35 mPa·s or more and 50 mPa·s or less, and more preferably 40 mPa·s or more and 45 mPa·s or less.
When the viscosity is 35 mPa·s or more, dispersibility in cellulose acylate is likely to be improved. When the viscosity is 50 mPa·s or less, the anisotropy of dispersion of the polyetherester compound is hard to appear. Therefore, when the viscosity is within the above range, the moldability of the resin composition is improved.
The viscosity is a value measured by an E-type viscometer.

The solubility parameter (SP value) of the polyether ester compound is preferably 9.5 or more and 9.9 or less, and more preferably 9.6 or more and 9.8 or less.
When the solubility parameter (SP value) is 9.5 or more and 9.9 or less, the dispersibility in cellulose acylate is likely to be improved.
The solubility parameter (SP value) is a value calculated by the method of Fedor. Specifically, the solubility parameter (SP value) is, for example, Polym. Eng. Sci. , Vol. 14, p. Based on the description of 147 (1974), the SP value is calculated by the following formula.
Formula: SP value=√(Ev/v)=√(ΣΔei/ΣΔvi)
(In the formula, Ev: evaporation energy (cal/mol), v: molar volume (cm ³ /mol), Δei: evaporation energy of each atom or atomic group, Δvi: molar volume of each atom or atomic group)
Note that the solubility parameter (SP value) uses (cal/cm ³ ) ^1/2 as a unit, but the unit is omitted according to the convention, and is expressed dimensionlessly.

Hereinafter, specific examples of the polyether ester compound will be shown, but the polyether ester compound is not limited thereto.

The content of the plasticizer in the resin composition according to this embodiment is preferably 15% by mass or less, more preferably 10% by mass or less, and further preferably 5% by mass or less, based on the total mass of the resin composition. When the ratio of the plasticizer is in the above range, the elastic modulus becomes higher and the heat resistance becomes higher. Further, bleeding of the plasticizer is also suppressed.

<Other ingredients>
Other components include, for example, flame retardants, compatibilizers, antioxidants, release agents, light stabilizers, weathering agents, colorants, pigments, modifiers, anti-drip agents, antistatic agents, and hydrolysis inhibitors. , Fillers, reinforcing agents (glass fiber, carbon fiber, talc, clay, mica, glass flake, milled glass, glass beads, crystalline silica, alumina, silicon nitride, aluminum nitride, boron nitride, etc.) and the like. The content of these components is preferably 0% by mass or more and 5% by mass or less with respect to the entire resin composition. Here, "0 mass%" means that other components are not included.

(Other resins)
The resin composition according to the present embodiment may contain a resin other than the cellulose acylate and the copolymer. However, the content of the other resin is preferably 5% by mass or less, more preferably 1% by mass, and particularly preferably not containing the other resin, based on the total mass of the resin composition.
Examples of other resins include conventionally known thermoplastic resins, specifically, polycarbonate resins; polypropylene resins; polyester resins; polyolefin resins; polyester carbonate resins; polyphenylene ether resins; polyphenylene sulfide resins; polysulfone resins; Polyethersulfone resin; polyarylene resin; polyetherimide resin; polyacetal resin; polyvinyl acetal resin; polyketone resin; polyetherketone resin; polyetheretherketone resin; polyarylketone resin; polyethernitrile resin; liquid crystal resin; polybenz Imidazole resin; polyparabanic acid resin; vinyl 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. -Based polymer or copolymer resin; diene-aromatic alkenyl compound copolymer resin; vinyl cyanide-diene-aromatic alkenyl compound copolymer resin; aromatic alkenyl compound-diene-vinyl cyanide-N-phenylmaleimide Copolymer resin; vinyl cyanide-(ethylene-diene-propylene (EPDM))-aromatic alkenyl compound copolymer resin; vinyl chloride resin; chlorinated vinyl chloride resin and the like. These resins may be used alone or in combination of two or more.

[Method for producing resin composition]
The method for producing the resin composition of the present embodiment has a step of preparing a resin composition containing the cellulose acylate and the copolymer.
The resin composition according to this embodiment is produced, for example, by melt-kneading a mixture containing at least cellulose acylate and, if necessary, a plasticizer, other components, and the like. In addition, the resin composition according to the present embodiment can be produced, for example, by dissolving the above components in a solvent.
Examples of the melt kneading means include known means, and specific examples thereof include a twin-screw extruder, a Henschel mixer, a Banbury mixer, a single-screw extruder, a multi-screw extruder, and a cokneader.
The temperature at the time of kneading may be determined according to the melting temperature of the cellulose acylate to be used, but from the viewpoint of thermal decomposition and fluidity, for example, 140°C or higher and 240°C or lower are preferable, and 160°C or higher and 210°C or higher. C. or less is more preferable.

[Resin Molded Body and Manufacturing Method Thereof]
The resin molded product according to the present embodiment has a weight-average molecular weight of 30,000 or more and 90,000 or less, and a content Ma of the structural unit represented by the following formula (a) contained in the copolymer and the following formula. Olefin-(meth)acrylate-(unsaturated-1,2-dicarboxylic acid anhydride) copolymer whose mass ratio Ma/Mb with the content Mb of the structural unit represented by (b) is 1 or more and 100 or less. Contains a resin formed by the reaction.

In the formula, R ¹ represents a hydrogen atom or a methyl group, R ² represents an alkyl group having 1 to 10 carbon atoms, and R ³ and R ⁴ each independently represent a hydrogen atom or alkyl having 1 to 10 carbon atoms. Represents a group.

Preferred aspects of the cellulose acylate and the copolymer in the resin molded product according to the present embodiment are the same as the preferred aspects of the cellulose acylate and the copolymer in the resin composition according to the present embodiment described above, respectively. is there.

The resin molding according to this embodiment is preferably formed by molding the resin composition according to this embodiment. At least a part of the cellulose acylate and the copolymer contained in the resin composition according to the present embodiment react at the time of molding to form a resin formed by the reaction of the cellulose acylate and the copolymer.
Further, the method for producing a resin molded product according to this embodiment preferably has a step of molding the resin composition according to this embodiment.
The molding method may be, for example, injection molding, extrusion molding, blow molding, hot press molding, calendar molding, coating molding, cast molding, dipping molding, vacuum molding, transfer molding, or the like.

In the method for manufacturing a resin molded body according to this embodiment, it is preferable to perform injection molding because the degree of freedom in shape is high. For injection molding, a resin composition is heated and melted, poured into a mold and solidified to obtain a molded body. It may be molded by injection compression molding.
The cylinder temperature for injection molding is preferably 140°C or higher and 240°C or lower, more preferably 150°C or higher and 220°C or lower, and further preferably 160°C or higher and 220°C or lower. The mold temperature for injection molding is preferably 30°C or higher and 120°C or lower, and more preferably 40°C or higher and 80°C or lower. The injection molding is performed using a commercially available device such as NEX500 manufactured by Nissei Plastic Industry Co., Ltd., NEX150 manufactured by Nissei Plastic Industry Co., Ltd., NEX700000 manufactured by Nissei Plastic Industry Co., Ltd., or SE50D manufactured by Toshiba Machine Co., Ltd., for example. Good.

The resin molded product according to this embodiment is suitably used for applications such as electronic/electrical devices, office equipment, home appliances, automobile interior materials, engine covers, vehicle bodies, and containers. More specifically, housings for electronic/electrical devices and home appliances; various parts for electronic/electrical devices and home appliances; interior parts for automobiles; storage cases for CD-ROM, DVD, etc.; tableware; beverage bottles; food trays A wrap material, a film, a sheet, and the like.

Hereinafter, the present invention will be described in more detail with reference to Examples, but the present invention is not limited to these Examples. In addition, "part" represents "part by mass" unless otherwise specified.

<Synthesis of cellulose acylate>
(Synthesis of Cellulose Acetate CA1)
Acetylation: 3 parts of cellulose powder (Nippon Paper Chemicals Co., Ltd., KC Flock W50), 0.15 parts of sulfuric acid, 30 parts of acetic acid, and 6 parts of acetic anhydride were placed in a reaction vessel and stirred at 20° C. for 4 hours. , Cellulose was acetylated.
Deacetylation and molecular weight reduction: Immediately after completion of stirring, 3 parts of acetic acid and 1.2 parts of pure water were added to the acetylated solution, and the mixture was stirred at 20° C. for 30 minutes and then a 0.2 M hydrochloric acid aqueous solution 4.5. Parts, and heated to 75° C. and stirred for 5 hours. This solution was added dropwise to 200 parts of pure water over 2 hours, allowed to stand for 20 hours, and then filtered through a filter having a pore size of 6 μm to obtain 4 parts of white powder.
Washing: The obtained white powder was washed with pure water using a filter press (Kurita Kikai Seisakusho, Ltd., SF(PP)) until the electric conductivity was 50 μS or less, and then dried.
Post-treatment: To 3 parts of white powder after drying, 0.2 part of calcium acetate and 30 parts of pure water were added, stirred at 25°C for 2 hours and then filtered, and the obtained powder was heated at 60°C for 72 hours. After drying, about 2.5 parts of cellulose acetate CA1 was obtained.

(Synthesis of Cellulose Acetate CA2)
Cellulose acetate CA2 was obtained in the same manner as in CA1, except that the amount of sulfuric acid used for acetylation was changed from 0.15 part to 0.30 part.

(Synthesis of Cellulose Acetate CA3)
Cellulose acetate CA3 was obtained in the same manner as CA1 except that the amount of sulfuric acid used for acetylation was changed from 0.15 part to 0.03 part.

(Synthesis of Cellulose Acetate CA4)
In deacetylation and molecular weight reduction, cellulose acetate CA4 was obtained in the same manner as in CA1, except that the place of stirring for 5 hours was changed to 7 hours.

(Synthesis of Cellulose Acetate CA5)
In deacetylation and molecular weight reduction, cellulose acetate CA5 was obtained in the same manner as in CA1, except that the stirring at 75° C. for 5 hours was performed at 65° C. for 7 hours.

(Synthesis of Cellulose Acetate CA6)
In deacetylation and molecular weight reduction, cellulose acetate CA6 was obtained in the same manner as in CA1, except that stirring at 75° C. for 5 hours was performed at 80° C. for 4 hours.

(Synthesis of Cellulose Propionate CP1)
In the acetylation, 2 parts of acetic anhydride was used, 2.5 parts of propionic anhydride was used, and the reaction time for deacylation and molecular weight reduction was changed to 5 hours. Pionate CP1 was obtained.

(Preparation of Cellulose Acetate CA7-1 to 3)
Commercially available cellulose acetate (manufactured by Daicel Corporation, L50), (manufactured by Daicel Corporation, L20) are cellulose acetates CA7-1, CA7-2, (Eastman Chemical Co., Ltd., CA398-3) CA7-. Prepared as 3.

(Synthesis of Cellulose Acetate CA8)
In deacetylation and molecular weight reduction, cellulose acetate CA8 was obtained in the same manner as in CA1, except that the place of stirring for 5 hours was changed to 4 hours and 30 minutes.

(Synthesis of Cellulose Acetate CA9)
Cellulose acetate CA9 was obtained in the same manner as in CA1, except that the solution obtained by acetylation was allowed to stand at room temperature (20° C., the same below) for 10 hours, and then deacetylated and reduced in molecular weight.

<Measurement of weight average molecular weight, degree of polymerization, degree of substitution>
The degree of polymerization of cellulose acylate is obtained from the weight average molecular weight according to the following procedure.
First, the weight average molecular weight of cellulose acylate is measured in terms of polystyrene with a GPC device (manufactured by Tosoh Corporation, HLC-8320GPC, column: TSKgelα-M) using a dimethylacetamide/lithium chloride=90/10 solution. ..
Then, the degree of polymerization of cellulose acylate is obtained by dividing the molecular weight of the constituent unit of cellulose acylate. The constitutional unit molecular weight is, for example, 263 when the degree of substitution with an acetyl group is 2.4 and 287 when the degree of substitution is 2.9. The results of evaluation of the degree of polymerization and the degree of substitution of the cellulose acylate synthesized by this method are summarized in Table 1.

<Synthesis of ethylene-(meth)acrylate-maleic anhydride copolymer>
(Preparation of EAM1 to 3)
A commercially available ethylene-(meth)acrylate-maleic anhydride copolymer, LOTDER 8200 (manufactured by Arkema) is EAM1, LOTADER 4210 (manufactured by Arkema) is EAM2, LOTDER 4603 (manufactured by Arkema) is EAM3, LOTDER4700 (manufactured by Arkema). Arkema) was designated as EAM4 and LOTADER3430 (Arkema) was designated as EAM5.

(Synthesis of EAM6)
89 parts by mass of ethylene monomer, 6.5 parts by mass of ethyl acrylate monomer, 7 parts by mass of maleic anhydride monomer were dissolved in tetrahydrofuran, 0.05 part by mass of azoisobutyronitrile was added, and the mixture was stirred at 40° C. for 24 hours. Then, the mixture was dropped into pure water, and the resulting precipitate was filtered and dried to obtain an ethylene-ethyl acrylate-maleic anhydride copolymer (EAM6).

(Synthesis of EAM7)
73.8 parts by mass of ethylene monomer, 26 parts by mass of methyl acrylate monomer, 0.2 parts by mass of maleic anhydride monomer were dissolved in tetrahydrofuran, 0.05 part by mass of azoisobutyronitrile was added, and the mixture was stirred at 40° C. for 24 hours. The product was added dropwise to pure water, and the resulting precipitate was filtered and dried to obtain an ethylene-methyl acrylate-maleic anhydride copolymer (EAM7).

(Synthesis of EAM8)
An ethylene-methyl acrylate-maleic anhydride copolymer (EAM8) was obtained in the same manner as EAM6 except that 90.7 parts of propylene monomer, 6.5 parts of methyl acrylate monomer and 2.8 parts of maleic anhydride monomer were used. ..

In Table 2, MA represents methyl acrylate, EA represents ethyl acrylate, and BA represents n-butyl acrylate.

<Preparation of adipic acid ester-containing compound>
A commercially available adipic acid ester-containing compound (Daifatty 101, manufactured by Daihachi Chemical Industry Co., Ltd.) was prepared as a compound AE1.

<Preparation of plasticizers other than adipate (other plasticizers)>
It was prepared as a commercially available polyether ester (manufactured by ADEKA, Adeka Sizer RS-1000) compound EE1.

<Evaluation of impact strength and flexural modulus>
The resin composition (pellets) was obtained by kneading with a twin-screw kneading device (manufactured by Toshiba Machine Co., Ltd., TEX41SS) at a cylinder temperature A at the composition ratio shown in Table 3.
Note that Comparative Examples 7 and 8 were kneaded with the composition of Example 1 or 3 described in JP-A-2014-084343 to obtain pellets.
Specifically, in Comparative Example 7, 25 parts by mass of an adipic acid ester-containing compound (Daifatty 101, manufactured by Daihachi Chemical Industry Co., Ltd.) per 100 parts by mass of cellulose acetate CA7-1 (manufactured by Daicel Corporation, L50). And 14 parts by mass of Paraloid (registered trademark) EXL-2602 (core/shell type graft copolymer composed of a butadiene-methyl methacrylate copolymer) manufactured by Rohm and Haas Co. was used.
In Comparative Example 8, 25 parts by mass of triphenyl phosphate (manufactured by Daihachi Chemical Industry Co., Ltd.) and 100 parts by mass of cellulose acetate CA7-1 (manufactured by Daicel Corp., L50), and Rohm and Haas 14 parts by mass of Paraloid (registered trademark) EXL-2602 (core/shell type graft copolymer made of butadiene-methyl methacrylate copolymer) manufactured by the same company was used.

About the obtained pellets, using an injection molding machine (NEX140III manufactured by Nissei Plastic Industry Co., Ltd.), at a cylinder temperature B at which the injection peak pressure does not exceed 180 MPa, the ISO multipurpose dumbbell (measurement part size: width 100 mm x thickness 40 mm ) Was molded.
The cylinder temperatures A and B are shown in Table 3.
Using the obtained ISO multipurpose dumbbell test piece, a notched impact test piece was processed by a method conforming to ISO179, and an impact strength measuring device (manufactured by Toyo Seiki Seisakusho, Charpy Auto Impact Tester CHN3 type) was used. The impact strength with notch at 23° C. was measured. The results are shown in Table 3.
Further, using a universal tester (manufactured by Shimadzu Corporation, Autograph AG-Xplus), the flexural modulus was measured by a method in accordance with ISO-178. The results are shown in Table 3.

<Evaluation of melt viscosity>
The melt viscosity of the obtained pellets was measured at 220° C. and a shear rate of 1,216 (/sec) using a capillary rheometer (Capillograph 1D, manufactured by Toyo Seiki Seisaku-sho, Ltd.). The smaller the melt viscosity value, the better the moldability.

It should be noted that OL in Table 3 means that measurement is impossible due to the overload of the load cell measurable range.
From the above results, it can be seen that the resin composition of the present example is superior in impact resistance to the resin composition of the comparative example, and a resin molded product having a high flexural modulus can be obtained.

Claims (11)

Cellulose acylate having a weight average molecular weight of 30,000 or more and 90,000 or less, and
When the mass ratio Ma/Mb between the content Ma of the structural unit represented by the following formula (a) and the content Mb of the structural unit represented by the following formula (b) contained in the copolymer is 1 or more and 100 or less. A resin composition containing an olefin-(meth)acrylate-(unsaturated-1,2-dicarboxylic acid anhydride) copolymer.

In the formula, R ¹ represents a hydrogen atom or a methyl group, R ² represents an alkyl group having 1 to 10 carbon atoms, and R ³ and R ⁴ each independently represent a hydrogen atom or alkyl having 1 to 10 carbon atoms. Represents a group. The olefin-(meth)acrylate-(unsaturated-1,2-dicarboxylic acid anhydride) copolymer is an ethylene-(meth)acrylate-(unsaturated-1,2-dicarboxylic acid anhydride) copolymer. The resin composition according to claim 1. The olefin-(meth)acrylate-(unsaturated-1,2-dicarboxylic acid anhydride) copolymer is an olefin-(meth)acrylate-maleic anhydride copolymer. Resin composition. The resin composition according to any one of claims 1 to 3, wherein the substitution degree of the cellulose acylate is 2.0 or more and 2.5 or less. The resin composition according to any one of claims 1 to 4, wherein the cellulose acylate has at least an acetyl group. Content of the said copolymer is 0.5 mass part or more and 10 mass parts or less with respect to 100 mass parts of the said cellulose acylate, The resin composition of any one of Claim 1 thru|or 5. The resin composition according to any one of claims 1 to 6, further comprising an adipic acid ester-containing compound. A resin molded body obtained by molding the resin composition according to any one of claims 1 to 7. Of the cellulose acylate having a weight average molecular weight of 30,000 or more and 90,000 or less, and the content Ma of the constitutional unit represented by the following formula (a) contained in the copolymer and the constitutional unit represented by the following formula (b) Resin molding containing a resin obtained by reacting an olefin-(meth)acrylate-(unsaturated-1,2-dicarboxylic acid anhydride) copolymer having a mass ratio Ma/Mb with a content Mb of 1 or more and 100 or less body.

In the formula, R ¹ represents a hydrogen atom or a methyl group, R ² represents an alkyl group having 1 to 10 carbon atoms, and R ³ and R ⁴ each independently represent a hydrogen atom or alkyl having 1 to 10 carbon atoms. Represents a group. The olefin-(meth)acrylate-(unsaturated-1,2-dicarboxylic acid anhydride) copolymer is an ethylene-(meth)acrylate-(unsaturated-1,2-dicarboxylic acid anhydride) copolymer. The resin molding according to claim 9. The olefin-(meth)acrylate-(unsaturated-1,2-dicarboxylic acid anhydride) copolymer is an olefin-(meth)acrylate-maleic anhydride copolymer. Resin molded product.