JP2010241849A - Cellulose derivative, resin composition, molding, chassis for electrical and electronic equipment, and production method of the cellulose derivative - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a cellulose derivative having good thermoplastic property, shock resistance and heat resistance and suitable for a molding process. <P>SOLUTION: The cellulose derivative includes a group expressed by general formula (I) and a group expressed by general formula (II). <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to a cellulose derivative, a resin composition, a molded body, a casing for electric and electronic equipment, and a method for producing a cellulose derivative.

  Various materials are used for members constituting electric and electronic devices such as copiers and printers in consideration of characteristics and functions required for the members. For example, PC (Polycarbonate), ABS (Acrylonitrile-butadiene-styrene) resin, PC / ABS, etc. are generally used as a member (housing) that stores a drive machine of an electric / electronic device and protects the drive machine. (Patent Document 1). These resins are produced by reacting compounds obtained from petroleum as a raw material.

  By the way, fossil resources such as oil, coal, and natural gas are mainly composed of carbon that has been fixed in the ground for many years. When such fossil resources or products made from fossil resources are burned and carbon dioxide is released into the atmosphere, carbon that was originally not deep in the atmosphere but fixed deep in the ground Is rapidly released as carbon dioxide, and carbon dioxide in the atmosphere greatly increases, which causes global warming. Therefore, polymers such as ABS and PC made from petroleum, which is a fossil resource, have excellent characteristics as materials for electrical and electronic equipment, but are made from petroleum, which is a fossil resource. Therefore, it is desirable to reduce the amount used from the viewpoint of preventing global warming.

On the other hand, a plant-derived resin is originally produced by a photosynthesis reaction using carbon dioxide and water in the atmosphere as raw materials. Therefore, even if plant-derived resin is incinerated to generate carbon dioxide, the carbon dioxide is equivalent to carbon dioxide originally in the atmosphere, so the balance of carbon dioxide in the atmosphere is plus or minus zero After all, there is an idea that the total amount of CO _{2 in} the atmosphere is not increased. Based on this idea, plant-derived resins are referred to as so-called “carbon neutral” materials. The use of carbon-neutral materials in place of petroleum-derived resins is an urgent need to prevent global warming in recent years.

  For this reason, in PC polymer, the method of reducing petroleum origin resources is proposed by using plant origin resources, such as starch, as some raw materials derived from petroleum (patent documents 2).

  Patent Document 3 below discloses that an aromatic acyl derivative of trityl cellulose is formed into a film by a solution casting method.

JP 56-55425 A JP 2008-24919 A JP 2007-297560 A

However, the aromatic acyl derivative of trityl cellulose described in Patent Document 3 does not have thermoplasticity and cannot be melt-molded.
The inventors of the present invention focused on using cellulose as a carbon neutral resin. However, since cellulose generally does not have thermoplasticity, it is difficult to mold by heating or the like, and thus is not suitable for molding. Further, even if thermoplasticity can be imparted, there is a problem that it is inferior in impact resistance and heat resistance.
An object of the present invention is to provide a cellulose derivative having good thermoplasticity, impact resistance, and heat resistance and suitable for molding processing.

The present inventors pay attention to the molecular structure of cellulose, and find that the cellulose has a specific structure to produce good thermoplasticity, impact resistance and heat resistance, and complete the present invention. It came to.
That is, the said subject can be achieved by the following means.

  1. A cellulose derivative having a group represented by the following general formula (I) and a group represented by the following general formula (II).

(In General Formula (I) and General Formula (II), R ₁ , R ₂ , and R ₃ each independently represent a halogen atom, an alkyl group, or an alkoxy group. R ₄ has 3 to 17 carbon atoms. N ₁ , n ₂ , and n ₃ each independently represents an integer of 0 to 5. * is bonded to a carbon atom at the 2nd, 3rd or 6th position of the glucose ring of cellulose. Represents the part to be performed.)
2. 2. The cellulose derivative according to 1 above, wherein R ₄ in the general formula (II) is an aliphatic group having a branched structure.
3. The cellulose derivative according to 1 or 2 above, wherein R ₄ in the general formula (II) is an aliphatic group having 3 to 9 carbon atoms.
4). The cellulose derivative according to 1 or 2 above, wherein R ₄ in the general formula (II) is an aliphatic group having 6 to 8 carbon atoms.
5). The cellulose derivative according to any one of 1 to 4 above, wherein n ₁ , n ₂ and n ₃ in the general formula (I) are all 0.
6). The resin composition containing the cellulose derivative in any one of said 1-5.
7). A molded article obtained by molding the cellulose derivative according to any one of 1 to 5 or the resin composition according to 6 above.
8). 8. A casing for an electric and electronic device comprising the molded article according to 7 above.
9. 6. A method for producing a cellulose derivative according to any one of 1 to 5 above, comprising reacting cellulose with a triphenylmethyl halide or triphenylmethyl halide derivative in the presence of a base, and reacting an acid chloride or an acid anhydride. A process for producing a cellulose derivative.
10. 10. The method for producing a cellulose derivative according to 9, wherein the step of reacting the triphenylmethyl halide or triphenylmethyl halide derivative and the step of reacting the acid chloride or acid anhydride are performed in one reaction vessel.

  Since the cellulose derivative of the present invention and the resin composition containing the cellulose derivative have excellent thermoplasticity, they can be formed into molded articles. Further, the molded body formed of the cellulose derivative or the resin composition of the present invention has good impact resistance, heat resistance, etc., and is a component of automobiles, home appliances, electric and electronic devices, mechanical parts, and houses. -It can be suitably used as a building material. Moreover, since it is a plant-derived resin, it can be replaced with a conventional petroleum-derived resin as a material that can contribute to the prevention of global warming.

Hereinafter, the present invention will be described in detail.
1. Cellulose Derivative The cellulose derivative of the present invention has a group represented by the following general formula (I) and a group represented by the following general formula (II).

(In General Formula (I) and General Formula (II), R ₁ , R ₂ , and R ₃ each independently represent a halogen atom, an alkyl group, or an alkoxy group. R ₄ has 3 to 17 carbon atoms. N ₁ , n ₂ , and n ₃ each independently represents an integer of 0 to 5. * is bonded to a carbon atom at the 2nd, 3rd or 6th position of the glucose ring of cellulose. Represents the part to be performed.)

That is, the cellulose derivative of the present invention has a repeating unit represented by the following general formula (III).
Formula (III)

In the general formula (III), X ² , X ³ and X ⁶ each independently represent a hydroxyl group or other substituent. However, at least a part of X ² , X ³ , and X ⁶ is substituted with the group represented by the general formula (I), and at least another part is represented by the general formula (II). Substituted on the group.
In the plurality of repeating units of the cellulose derivative, the plurality of X ² , X ³ , and X ⁶ may be the same or different.
Since the substitution with the group represented by the general formula (I) and the group represented by the general formula (II) may be a part of X ² , X ³ and X ⁶ , X ² , X ³ and X ^{6 which} are not represented by the group represented by the general formula (II) may be a hydroxyl group or other substituents.

  The cellulose derivative of the present invention is a group in which at least a part of the hydroxyl group bonded to the carbon atom at the 2-position, 3-position or 6-position of the β-glucose ring of cellulose is represented by the general formula (I) and By being substituted by the group represented by the formula (II), thermoplasticity can be exhibited, which is suitable for molding processing. Moreover, the cellulose derivative of the present invention can exhibit excellent strength and heat resistance as a molded body. Furthermore, since cellulose is a complete plant-derived component, it is carbon neutral and can greatly reduce the burden on the environment.

  The cellulose derivative of the present invention includes a group represented by the general formula (I) and a group represented by the general formula (II), wherein at least a part of the hydroxyl group bonded to the 2-position, 3-position, or 6-position carbon atom of the β-glucose ring of cellulose. In the synthesis, at least a part of the hydroxyl group bonded to the carbon atom at the 2-position or 6-position of the β-glucose ring is preferably represented by the formula (I) and A group that is substituted by a group represented by the general formula (II), more preferably a group in which at least a part of the hydroxyl group bonded to the 6-position carbon atom of the β-glucose ring is represented by the general formula (I) And a case where it is substituted by a group represented by the general formula (II).

  The “cellulose” referred to in the present invention is a polymer compound in which a large number of glucoses are polymerized by β-1,4-glycosidic bonds, and the carbon atoms at the 2nd, 3rd and 6th positions in the glucose ring of cellulose. Means that the hydroxyl group bonded to is unsubstituted.

The cellulose derivative of the present invention only needs to contain the group represented by the general formula (I) and the group represented by the general formula (II) in any part of the whole, and consists of the same repeating unit. It may be composed of a plurality of types of repeating units. Further, the cellulose derivative of the present invention need not contain both the group represented by the general formula (I) and the group represented by the general formula (II) in one repeating unit.
For example, in the general formula (III), (1) a monomer in which a part of X ² , X ³ and X ⁶ is substituted with a group represented by the general formula (I), and X ² , X ³ And a part of X ⁶ may be a polymer composed of a monomer substituted with a group represented by the general formula (II), and (2) one repeating unit X ² , X ³ and X ⁶ may be a polymer composed of a single monomer in which both the group represented by the general formula (I) and the group represented by the general formula (II) are substituted. . Further, (3) a polymer in which different types of repeating units represented by the general formula (III) are randomly polymerized may be used.
A part of the polymer may contain an unsubstituted repeating unit (that is, a repeating unit in which X ² , X ³ and X ⁶ are all hydroxyl groups in the general formula (III)).

R ₁ , R ₂ and R ₃ in the general formula (I) each independently represent a halogen atom, an alkyl group or an alkoxy group.
Examples of the halogen atom include a fluorine atom, a chlorine atom, a bromine atom, and an iodine atom. A fluorine atom and a chlorine atom are preferable, and a chlorine atom is more preferable.
The alkyl group may be an unsubstituted alkyl group or an alkyl group having a substituent. Examples of the substituent include a hydroxyl group and a cyano group. The alkyl group is preferably an unsubstituted alkyl group. The alkyl group preferably has 1 to 4 carbon atoms, more preferably 1 to 2 carbon atoms. Specifically, the alkyl group is preferably a methyl group, an ethyl group, a propyl group, an isopropyl group, a 1-methylpropyl group, a 2-methylpropyl group, or a tert-butyl group, and more preferably a methyl group or an ethyl group.
The alkoxy group preferably has 1 or 2 carbon atoms, more preferably 1 carbon atom. Specifically, the alkoxy group is preferably a methoxy group or an ethoxy group, and more preferably a methoxy group.
R ₁ , R ₂ , and R ₃ are preferably a methoxy group, a methyl group, and an ethyl group, and more preferably a methoxy group, because of the impact resistance.
In general formula _n 1 in _{(I), n 2, n} 3 each independently represents an integer of 0 to 5. If n _{1, n} 2, _{n 3} represents an integer of _{2~5, R 1,} R _2, and _{R 3} may be different in each identical in the presence of two or more.
In the present invention, it is particularly preferable that n ₁ , n ₂ , and n ₃ are all 0 because of the development of impact resistance.
* In general formula (I) represents the site | part couple | bonded with the 2nd, 3rd, or 6th carbon atom of the glucose ring of cellulose.

In general formula (II), R ₄ represents an aliphatic group having 3 to 17 carbon atoms. * In general formula (II) represents the site | part couple | bonded with the 2nd, 3rd, or 6th carbon atom of the glucose ring of cellulose.

R ₄ may have any of a linear structure, a branched structure, and a cyclic structure. R ₄ preferably has 3 to 9 carbon atoms, more preferably 6 to 8 carbon atoms, and particularly preferably 7 carbon atoms. It is preferable for it to be in the above-mentioned range because of imparting thermoplasticity and developing impact resistance.
Specifically, propyl group, isopropyl group, butyl group, 1-methylpropyl group, 2-methylpropyl group, tert-butyl group, pentyl group, 1-methylbutyl group, 2-methylbutyl group, 3-methylbutyl group, 1 , 1-dimethylpropyl group, 1,2-dimethylpropyl group, 2,2-dimethylpropyl group, 1-ethylpropyl group, hexyl group, 1-methylpentyl group, 2-methylpentyl group, 3-methylpentyl group, 4-methylpentyl group, 1,1-dimethylbutyl group, 1,2-dimethylbutyl group, 2,2-dimethylbutyl group, 1-ethylbutyl group, cyclopentyl group, heptyl group, 1-methylhexyl group, 2-methyl Hexyl group, 3-methylhexyl group, 4-methylhexyl group, 5-methylhexyl group, 1,1-dimethylpentyl group, 1,2- Methylpentyl group, 2,2-dimethylhexpentyl group, 1-ethylpentyl group, 1-propylbutyl group, octyl group, 1-methylheptyl group, 2-methylheptyl group, 3-methylheptyl group, 4-methylheptyl group Group, 5-methylheptyl group, 1,1-dimethylhexyl group, 1,2-dimethylhexyl group, 2,2-dimethylhexyl group, 1-ethylhexyl group, 1-propylpentyl group, 1-butylhexyl group, nonanyl Group, 1-methyloctyl group, 2-methyloctyl group, 3-methyloctyl group, 4-methyloctyl group, 5-methyloctyl group, 6-methylnooctyl group, 1,1-dimethylheptyl group, 1,2 -Dimethylheptyl group, 2,2-dimethylheptyl group, 1-ethylheptyl group, 1-propylhexyl group, 1-butylpentyl group Undecyl group, a tridecyl group, a pentadecyl group, a heptadecyl group, and the like. These may be used alone or in a combination of two or more.

R ₄ preferably has a branched structure for the purpose of developing impact resistance, and more preferably an aliphatic group having a branched structure at the 1-position. Thereby, strength, such as impact resistance, can be improved.
Among the aliphatic groups having a branched structure, among them, 1-propylbutyl group (—CH (C ₃ H ₇ ) ₂ ), 1-ethylpentyl group (—CH (C ₂ H ₅ ) C ₄ H ₉ ) And 1-methylhexyl group (—CH (CH ₃ ) C ₅ H ₁₁ ) and the like are particularly preferable.

R ₄ may have a further substituent. Further substituents include, for example, a hydroxy group, a mercapto group, a halogen atom (for example, a fluorine atom, a chlorine atom, a bromine atom, an iodine atom), a cyano group, a sulfo group, a carboxyl group, a nitro group, a hydroxamic acid group, a sulfino group, A hydrazino group, an imino group, etc. are mentioned.
When R ₄ has a further substituent and the substituent contains carbon, the carbon number of the substituent shall not be included as the carbon number of R ₄ .

Substitution positions of the group represented by the general formula (I) and the group represented by the general formula (II) in the cellulose derivative, the group represented by the general formula (I) per β-glucose ring unit, and the general The number (substitution degree) of the group represented by formula (II) is not particularly limited.
For example, the substitution degree DS _B of the group represented by the general formula (I) (represented by the general formula (I) for the hydroxyl groups at the 2nd, 3rd and 6th positions of the cellulose structure of the β-glucose ring in the repeating unit) The number of groups) is preferably 0.1 to 1, more preferably 0.1 to 0.3.
Degree of substitution DS _{C of the} group represented by the general formula (II) (in the repeating unit, the group represented by the general formula (II) with respect to the hydroxyl groups at the 2nd, 3rd and 6th positions of the cellulose structure of the β-glucose ring) The number) is preferably 0.5 to 2.5, more preferably 0.7 to 1.5. By setting it as the substituent of such a range, heat resistance, brittleness, etc. can be improved.

Further, the number of unsubstituted hydroxyl groups present in the cellulose derivative is not particularly limited.
Hydroxyl substitution degree DS _A (ratio in which the hydroxyl groups at the 2nd, 3rd and 6th positions in the repeating unit are unsubstituted) is usually about 0.01 to 1.5, preferably about 0.2 to 1.2. do it. The DS _A by 0.01 or more, it is possible to improve the fluidity of the resin composition. Further, by setting the DS _A and 1.5 or less, or to improve the fluidity of the resin composition, foaming or the like due to water absorption of the resin composition during acceleration and molding of the pyrolysis can or is suppressed.
Note that the sum of the degrees of substitution (DS _A + DS _B + DS _C ) is 3.

The molecular weight of the cellulose derivative of the present invention is preferably in the range of 5,000 to 1,000,000, more preferably in the range of 10,000 to 500,000, and most preferably in the range of 100,000 to 200,000. The weight average molecular weight (Mw) is preferably in the range of 7000 to 5000000, more preferably in the range of 15000 to 2500,000, and most preferably in the range of 300000 to 150,000. The molecular weight distribution (MWD) is preferably in the range of 1.1 to 5.0, more preferably in the range of 1.5 to 4.0. By setting the average molecular weight within this range, it is possible to improve the moldability and mechanical strength of the molded body. Moreover, moldability etc. can be improved by setting it as the molecular weight distribution of this range.
In the present invention, the number average molecular weight (Mn), weight average molecular weight (Mw) and molecular weight distribution (MWD) can be measured using gel permeation chromatography (GPC). Specifically, tetrahydrofuran can be used as a solvent, polystyrene gel can be used, and the molecular weight can be obtained using a conversion molecular weight calibration curve obtained in advance from a constituent curve of standard monodisperse polystyrene.

2. Method for Producing Cellulose Derivative The method for producing the cellulose derivative of the present invention is not particularly limited, but the cellulose derivative of the present invention can be suitably produced by using cellulose as a raw material and etherifying and esterifying cellulose. The raw material for cellulose is not limited, and examples thereof include cotton, linter, and pulp.
A preferred embodiment of the production method includes a step of reacting cellulose with triphenylmethyl halide or a derivative thereof in the presence of a base, and a step of reacting acid chloride or acid anhydride with the reason of suppressing a decrease in molecular weight of cellulose. It is preferable that it is included. Examples of triphenylmethyl halide derivatives include those having a substituent on the phenyl group of triphenylmethyl halide.
Further, because the removal operation after completion of one reaction step can be omitted, the step of reacting triphenylmethyl halide or its derivative and the step of reacting acid chloride or acid anhydride are carried out in one reaction vessel. Is preferably carried out.
The cellulose is etherified and reacted by reacting triphenylmethyl halide or a derivative thereof, and acid chloride or acid anhydride with at least a part of hydroxyl groups at the 2nd, 3rd and 6th positions of the β-glucose ring of the cellulose. The group represented by the general formula (I) and the group represented by the general formula (II) can be introduced into the cellulose.

  Examples of triphenylmethyl halide or its derivative for etherifying cellulose include trityl chloride, trityl bromide, 2-chlorotrityl chloride, 4-trimethyltriphenylmethyl chloride, 4-methoxytriphenylmethyl chloride, 4,4 Examples include '-dimethoxytriphenylmethyl chloride, 4,4', 4 ''-trimethoxytriphenylmethyl chloride, and the like.

  As the acid chloride for esterifying cellulose, for example, carboxylic acid chloride having 4 to 18 carbon atoms can be used. Examples of the carboxylic acid chloride having 4 to 18 carbon atoms include butyryl chloride, isobutyryl chloride, pentanoyl chloride, 2-methylbutanoyl chloride, 3-methylbutanoyl chloride, pivaloyl chloride, hexanoyl chloride, 2-methylpentanoyl chloride, 3-methylpentanoyl chloride, 4-methylpentanoyl chloride, 2,2-dimethylbutanoyl chloride, 2,3-dimethylbutanoyl chloride, 3,3-dimethylbutanoyl chloride, 2- Ethylbutanoyl chloride, heptanoyl chloride, 2-methylhexanoyl chloride, 3-methylhexanoyl chloride, 4-methylhexanoyl chloride, 5-methylhexanoyl chloride, 2,2-dimethylpentanoyl chloride, 2,3- Dimethylpentanoyl Loride, 3,3-dimethylpentanoyl chloride, 2-ethylpentanoyl chloride, cyclohexanoyl chloride, octanoyl chloride, 2-methylheptanoyl chloride, 3-methylheptanoyl chloride, 4-methylheptanoyl chloride, 5- Methylheptanoyl chloride, 6-methylheptanoyl chloride, 2,2-dimethylhexanoyl chloride, 2,3-dimethylhexanoyl chloride, 3,3-dimethylhexanoyl chloride, 2-ethylhexanoyl chloride, 2-propylpenta Noyl chloride, nonanoyl chloride, 2-methyloctanoyl chloride, 3-methyloctanoyl chloride, 4-methyloctanoyl chloride, 5-methyloctanoyl chloride, 6-methyloctanoyl chloride, 2,2-dimethyl Ptanoyl chloride, 2,3-dimethylheptanoyl chloride, 3,3-dimethylheptanoyl chloride, 2-ethylheptanoyl chloride, 2-propylhexanoyl chloride, 2-butylpentanoyl chloride, decanoyl chloride, 2-methyl Nonanoyl chloride, 3-methylnonanoyl chloride, 4-methylnonanoyl chloride, 5-methylnonanoyl chloride, 6-methylnonanoyl chloride, 7-methylnonanoyl chloride, 2,2-dimethyloctanoyl chloride, 2, 3-dimethyloctanoyl chloride, 3,3-dimethyloctanoyl chloride, 2-ethyloctanoyl chloride, 2-propylheptanoyl chloride, 2-butylhexanoyl chloride, lauroyl chloride, myristoyl chloride, palmitoyl chloride Examples include loride and stearoyl chloride.

  As the acid anhydride, for example, a carboxylic acid anhydride composed of a carboxylic acid having 4 to 18 carbon atoms can be used. Examples of such carboxylic anhydrides include butyric anhydride, valeric anhydride, hexanoic anhydride, heptanoic anhydride, octanoic anhydride, 2-ethylhexanoic anhydride, nonanoic anhydride, decane. Examples include acid anhydride, lauric acid anhydride, myristic acid anhydride, palmitic acid anhydride, stearic acid anhydride, and the like.

  As the base, for example, pyridine, lutidine, dimethylaminopyridine, triethylamine, diethylbutylamine, diazabicycloundecene, potassium carbonate and the like can be used. Of these, pyridine, dimethylaminopyridine and the like are preferable.

  Other specific production conditions and the like can follow conventional methods. For example, a method described in “Encyclopedia of Cellulose” pages 131 to 164 (Asakura Shoten, 2000) can be referred to.

3. Resin composition containing cellulose derivative and molded article The resin composition of the present invention contains the cellulose derivative of the present invention, and may contain other additives as necessary.
The content ratio of the components contained in the resin composition is not particularly limited. The cellulose derivative is contained in an amount of 75% by mass or more, preferably 80% by mass or more, more preferably 80 to 100% by mass.
In addition to the cellulose derivative of the present invention, the resin composition of the present invention may contain various additives such as a filler and a flame retardant as necessary.

  The resin composition of the present invention may contain a filler (reinforcing material). By containing the filler, the mechanical properties of the molded body formed from the resin composition can be enhanced.

Usable fillers can be used. The shape of the filler may be any of fibrous, plate-like, granular, powdery and the like. Further, it may be inorganic or organic.
Specifically, as the inorganic filler, glass fiber, carbon fiber, graphite fiber, metal fiber, potassium titanate whisker, aluminum borate whisker, magnesium whisker, silicon whisker, wollastonite, sepiolite, slag fiber, zonolite, Elastadite, gypsum fiber, silica fiber, silica-alumina fiber, zirconia fiber, boron nitride fiber, silicon nitride fiber and boron fiber, and other inorganic fillers; glass flakes, non-swellable mica, carbon black, graphite, metal foil , Ceramic beads, talc, clay, mica, sericite, zeolite, bentonite, dolomite, kaolin, fine silica, feldspar powder, potassium titanate, shirasu balloon, calcium carbonate, magnesium carbonate, barium sulfate, calcium oxide Um, aluminum oxide, titanium oxide, magnesium oxide, aluminum silicate, silicon oxide, aluminum hydroxide, magnesium hydroxide, gypsum, novaculite, dawsonite, and a plate-like or granular inorganic fillers of clay or the like.

  Organic fillers include synthetic fibers such as polyester fiber, nylon fiber, acrylic fiber, regenerated cellulose fiber, and acetate fiber, and natural fibers such as kenaf, ramie, cotton, jute, hemp, sisal, Manila hemp, flax, linen, silk, and wool. Examples thereof include fibrous organic fillers obtained from microcrystalline cellulose, sugar cane, wood pulp, paper waste, waste paper and the like, and granular organic fillers such as organic pigments.

  When the resin composition contains a filler, the content is not limited, but is usually about 30 parts by mass or less, preferably about 5 to 10 parts by mass with respect to 100 parts by mass of the cellulose derivative.

The resin composition of the present invention may contain a flame retardant. Thereby, the flame retarding effect such as reduction or suppression of the burning rate can be improved.
The flame retardant is not particularly limited, and a conventional flame retardant can be used. For example, brominated flame retardants, chlorine-based flame retardants, phosphorus-containing flame retardants, silicon-containing flame retardants, nitrogen compound-based flame retardants, inorganic flame retardants and the like can be mentioned. Among these, hydrogen halides are not generated by thermal decomposition during compounding with resin or during molding, causing corrosion of processing machines and molds, and worsening the work environment. Phosphorus-containing flame retardants and silicon-containing flame retardants are preferred because they are less likely to adversely affect the environment through the generation of harmful substances such as dioxins when they are diffused or decomposed.

  The phosphorus-containing flame retardant is not particularly limited, and a commonly used one can be used. Examples thereof include organic phosphorus compounds such as phosphate esters, phosphate condensation esters, and polyphosphates.

  Specific examples of phosphate esters include trimethyl phosphate, triethyl phosphate, tributyl phosphate, tri (2-ethylhexyl) phosphate, tributoxyethyl phosphate, triphenyl phosphate, tricresyl phosphate, trixylenyl phosphate, tris (isopropylphenyl) Phosphate, tris (phenylphenyl) phosphate, trinaphthyl phosphate, cresyl diphenyl phosphate, xylenyl diphenyl phosphate, diphenyl (2-ethylhexyl) phosphate, di (isopropylphenyl) phenyl phosphate, monoisodecyl phosphate, 2-acryloyloxyethyl Acid phosphate, 2-methacryloyloxyethyl acid phosphate, diphenyl Examples include 2-acryloyloxyethyl phosphate, diphenyl-2-methacryloyloxyethyl phosphate, melamine phosphate, dimelamine phosphate, melamine pyrophosphate, triphenylphosphine oxide, tricresylphosphine oxide, diphenyl methanephosphonate, diethyl phenylphosphonate be able to.

  Examples of phosphoric acid condensed esters include resorcinol polyphenyl phosphate, resorcinol poly (di-2,6-xylyl) phosphate, bisphenol A polycresyl phosphate, hydroquinone poly (2,6-xylyl) phosphate, and condensates thereof. Aromatic phosphoric acid condensed ester and the like.

  Moreover, the polyphosphate which consists of a salt of phosphoric acid, polyphosphoric acid, a periodic table group 1-14 group metal, ammonia, an aliphatic amine, and an aromatic amine can also be mentioned. As typical salts of polyphosphates, lithium salts, sodium salts, calcium salts, barium salts, iron (II) salts, iron (III) salts, aluminum salts and the like as metal salts, methylamine salts as aliphatic amine salts, Examples include ethylamine salts, diethylamine salts, triethylamine salts, ethylenediamine salts, piperazine salts, and examples of aromatic amine salts include pyridine salts and triazines.

In addition to the above, halogen-containing phosphate esters such as trischloroethyl phosphate, trisdichloropropyl phosphate, tris (β-chloropropyl) phosphate), and structures in which a phosphorus atom and a nitrogen atom are connected by a double bond Phosphazene compounds having phosphoric acid and phosphoric ester amides.
These phosphorus-containing flame retardants may be used singly or in combination of two or more.

  Examples of the silicon-containing flame retardant include an organic silicon compound having a two-dimensional or three-dimensional structure, polydimethylsiloxane, or a methyl group at a side chain or a terminal of polydimethylsiloxane, a hydrogen atom, a substituted or unsubstituted aliphatic hydrocarbon group, Examples thereof include those substituted or modified with an aromatic hydrocarbon group, so-called silicone oils, or modified silicone oils.

Examples of the substituted or unsubstituted aliphatic hydrocarbon group and aromatic hydrocarbon group include an alkyl group, a cycloalkyl group, a phenyl group, a benzyl group, an amino group, an epoxy group, a polyether group, a carboxyl group, a mercapto group, Examples include a chloroalkyl group, an alkyl higher alcohol ester group, an alcohol group, an aralkyl group, a vinyl group, or a trifluoromethyl group.
These silicon-containing flame retardants may be used alone or in combination of two or more.

  Examples of the flame retardant other than the phosphorus-containing flame retardant or the silicon-containing flame retardant include, for example, magnesium hydroxide, aluminum hydroxide, antimony trioxide, antimony pentoxide, sodium antimonate, zinc hydroxystannate, zinc stannate, Metastannic acid, tin oxide, tin oxide salt, zinc sulfate, zinc oxide, ferrous oxide, ferric oxide, stannous oxide, stannic oxide, zinc borate, ammonium borate, ammonium octamolybdate, tungsten Inorganic flame retardants such as acid metal salts, complex oxides of tungsten and metalloid, ammonium sulfamate, ammonium bromide, zirconium compounds, guanidine compounds, fluorine compounds, graphite, and swellable graphite can be used. . These other flame retardants may be used alone or in combination of two or more.

  When the resin composition of the present invention contains a flame retardant, its content is not limited, but is usually about 30 parts by mass or less, preferably about 2 to 10 parts by mass with respect to 100 parts by mass of the cellulose derivative. Good. By setting it as this range, impact resistance, brittleness, etc. can be improved, or generation | occurrence | production of pellet blocking can be suppressed.

In addition to the cellulose derivative, filler and flame retardant, the resin composition of the present invention is not limited to the purpose of the present invention, and other properties are intended to further improve various properties such as moldability and flame retardancy. Ingredients may be included.
Examples of other components include polymers other than the cellulose derivatives, plasticizers, stabilizers (antioxidants, UV absorbers, etc.), mold release agents (fatty acids, fatty acid metal salts, oxyfatty acids, fatty acid esters, aliphatic moieties. Saponified ester, paraffin, low molecular weight polyolefin, fatty acid amide, alkylene bis fatty acid amide, aliphatic ketone, fatty acid lower alcohol ester, fatty acid polyhydric alcohol ester, fatty acid polyglycol ester, modified silicone), antistatic agent, flame retardant aid, Examples include processing aids, anti-drip agents, antibacterial agents, and antifungal agents. Furthermore, a coloring agent containing a dye or a pigment can be added.

  As the polymer other than the cellulose derivative, either a thermoplastic polymer or a thermosetting polymer can be used, but a thermoplastic polymer is preferable from the viewpoint of moldability. Specific examples of polymers other than cellulose derivatives include low density polyethylene, linear low density polyethylene, high density polyethylene, polypropylene, ethylene-propylene copolymer, ethylene-propylene-nonconjugated diene copolymer, ethylene-butene- 1 copolymer, polypropylene homopolymer, polypropylene copolymer (such as ethylene-propylene block copolymer), polyolefin such as polybutene-1 and poly-4-methylpentene-1, polybutylene terephthalate, polyethylene terephthalate and other aromatic polyesters, etc. Polyamide such as polyester, nylon 6, nylon 46, nylon 66, nylon 610, nylon 612, nylon 6T, nylon 12, etc., polystyrene, high impact polystyrene, poly Settals (including homopolymers and copolymers), polyurethanes, aromatic and aliphatic polyketones, polyphenylene sulfide, polyetheretherketone, thermoplastic starch resins, polymethyl methacrylate and methacrylate-acrylate copolymers Acrylic resin, AS resin (acrylonitrile-styrene copolymer), ABS resin, AES resin (ethylene rubber reinforced AS resin), ACS resin (chlorinated polyethylene reinforced AS resin), ASA resin (acrylic rubber reinforced AS resin) , Polyvinyl chloride, polyvinylidene chloride, vinyl ester resin, maleic anhydride-styrene copolymer, MS resin (methyl methacrylate-styrene copolymer), polycarbonate, polyarylate, polysulfone, polyethersulfone, pheno Thermoplastic polyimide such as silicone resin, polyphenylene ether, modified polyphenylene ether, polyetherimide, polytetrafluoroethylene, tetrafluoroethylene-hexafluoropropylene copolymer, tetrafluoroethylene-ethylene copolymer, tetrafluoroethylene-perfluoro Fluoropolymers such as alkyl vinyl ether copolymer, polychlorotrifluoroethylene, polyvinylidene fluoride, tetrafluoroethylene-hexafluoropropylene-perfluoroalkyl vinyl ether copolymer, cellulose acetate, polyvinyl alcohol, unsaturated polyester, melamine resin, A phenol resin, a urea resin, a polyimide, etc. can be mentioned. In addition, various acrylic rubbers, ethylene-vinyl acetate copolymers, ethylene-acrylic acid copolymers and alkali metal salts thereof (so-called ionomers), ethylene-acrylic acid alkyl ester copolymers (for example, ethylene-ethyl acrylate copolymer) Copolymer, ethylene-butyl acrylate copolymer), diene rubber (for example, 1,4-polybutadiene, 1,2-polybutadiene, polyisoprene, polychloroprene), copolymer of diene and vinyl monomer (for example, Styrene-butadiene random copolymer, styrene-butadiene block copolymer, styrene-butadiene-styrene block copolymer, styrene-isoprene random copolymer, styrene-isoprene block copolymer, styrene-isoprene-styrene block copolymer Polymer, polybutadiene Styrene-grafted styrene, butadiene-acrylonitrile copolymer), polyisobutylene, copolymer of isobutylene and butadiene or isoprene, butyl rubber, natural rubber, thiocol rubber, polysulfide rubber, acrylic rubber, nitrile rubber, Examples include polyether rubber, epichlorohydrin rubber, fluorine rubber, silicone rubber, and other thermoplastic elastomers such as polyurethane, polyester, and polyamide.

Furthermore, those having various degrees of crosslinking, those having various microstructures, for example, those having a cis structure, a trans structure, etc., those having a vinyl group, or those having various average particle diameters (in the resin composition) Or a multi-layer polymer called a so-called core-shell rubber composed of a core layer and one or more shell layers covering the core layer, and adjacent layers made of different types of polymers can be used. A core-shell rubber containing a silicone compound can also be used.
These polymers may be used alone or in combination of two or more.

  When the resin composition of this invention contains polymers other than a cellulose derivative, about 30 mass parts or less are preferable with respect to 100 mass parts of cellulose derivatives, and about 2-10 mass parts is more preferable.

  The resin composition of the present invention may contain a plasticizer. Thereby, a flame retardance and a moldability can be improved further. As the plasticizer, those commonly used for polymer molding can be used. Examples thereof include polyester plasticizers, glycerin plasticizers, polycarboxylic acid ester plasticizers, polyalkylene glycol plasticizers, and epoxy plasticizers.

  Specific examples of the polyester plasticizer include acid components such as adipic acid, sebacic acid, terephthalic acid, isophthalic acid, naphthalenedicarboxylic acid, diphenyldicarboxylic acid, rosin, propylene glycol, 1,3-butanediol, 1,4 -Polyesters composed of diol components such as butanediol, 1,6-hexanediol, ethylene glycol and diethylene glycol, and polyesters composed of hydroxycarboxylic acids such as polycaprolactone. These polyesters may be end-capped with a monofunctional carboxylic acid or monofunctional alcohol, or may be end-capped with an epoxy compound or the like.

  Specific examples of the glycerin plasticizer include glycerin monoacetomonolaurate, glycerin diacetomonolaurate, glycerin monoacetomonostearate, glycerin diacetomonooleate, and glycerin monoacetomonomontanate.

  Specific examples of polycarboxylic acid plasticizers include phthalates such as dimethyl phthalate, diethyl phthalate, dibutyl phthalate, dioctyl phthalate, diheptyl phthalate, dibenzyl phthalate, butyl benzyl phthalate, and trimellitic acid. Trimellitic acid esters such as tributyl, trioctyl trimellitic acid, trihexyl trimellitic acid, diisodecyl adipate, n-octyl-n-decyl adipate, methyl diglycol butyl diglycol adipate, benzyl methyl diglycol adipate, adipic acid Adipic acid esters such as benzylbutyl diglycol, citrate esters such as triethyl acetylcitrate and tributyl acetylcitrate, azelaic acid esters such as di-2-ethylhexyl azelate, sebacin Dibutyl, and di-2-ethylhexyl sebacate, and the like.

  Specific examples of the polyalkylene glycol plasticizer include polyethylene glycol, polypropylene glycol, poly (ethylene oxide / propylene oxide) block and / or random copolymer, polytetramethylene glycol, ethylene oxide addition polymer of bisphenols, bisphenols And a polyalkylene glycol such as a propylene oxide addition polymer, a tetrahydrofuran addition polymer of bisphenol, or a terminal epoxy-modified compound thereof, a terminal ester-modified compound, a terminal ether-modified compound, and the like.

  The epoxy plasticizer generally refers to an epoxy triglyceride composed of an alkyl epoxy stearate and soybean oil, but there are also so-called epoxy resins mainly made of bisphenol A and epichlorohydrin. Can be used.

  Specific examples of other plasticizers include benzoic acid esters of aliphatic polyols such as neopentyl glycol dibenzoate, diethylene glycol dibenzoate, triethylene glycol di-2-ethylbutyrate, fatty acid amides such as stearamide, oleic acid Examples thereof include aliphatic carboxylic acid esters such as butyl, oxy acid esters such as methyl acetylricinoleate and butyl acetylricinoleate, pentaerythritol, and various sorbitols.

  When the resin composition of the present invention contains a plasticizer, the content is usually about 5 parts by mass or less, preferably about 0.005 to 5 parts by mass, more preferably about 100 parts by mass of the cellulose derivative. About 0.01 to 1 part by mass.

The molded article of the present invention can be obtained by molding a resin composition containing the cellulose derivative of the present invention. More specifically, the resin composition containing the cellulose derivative of the present invention and various additives as required is melted by heating or the like and molded by various molding methods.
Examples of the molding method include injection molding, extrusion molding, blow molding and the like.
The heating temperature is usually about 160 to 260 ° C, preferably about 180 to 240 ° C.

  The use of the molded product of the present invention is not particularly limited. For example, interior or exterior parts of electric and electronic equipment (home appliances, OA / media related equipment, optical equipment, communication equipment, etc.), automobiles, mechanical parts, etc. And materials for housing and construction. Among these, from the viewpoint of having excellent heat resistance and impact resistance and low environmental impact, for example, exterior parts for electrical and electronic equipment such as copiers, printers, personal computers, and televisions (especially casings). Can be suitably used.

  EXAMPLES The present invention will be specifically described below with reference to examples and comparative examples, but the scope of the present invention is not limited to the examples shown below.

<Synthesis Example 1: Synthesis of tritylcellulose 2-ethylhexanoate (P-1)>
Into a 2 L three-necked flask equipped with a mechanical stirrer, thermometer, condenser, and dropping funnel, 20 g of cellulose (manufactured by Nippon Paper Industries Co., Ltd .: KC Flock W50) and 700 mL of dimethylacetamide were weighed and stirred at 120 ° C. for 2 hours. Next, 60 g of lithium chloride was added, and the mixture was further stirred for 1 hour, and then the cellulose was dissolved by returning the reaction solution to room temperature. Thereafter, 29.8 mL of pyridine and 68.9 g of trityl chloride were added at room temperature, and the mixture was stirred at 60 ° C. for 3 hours. Subsequently, the temperature was returned to room temperature, 60.3 g of 2-ethylhexanoyl chloride was added dropwise, and the mixture was further stirred at 60 ° C. for 3 hours. After the reaction, when the obtained solution was poured into 2 L of a water-methanol mixed solvent (volume ratio-water: methanol = 1: 1), a white solid was precipitated. The obtained white solid was separated by suction filtration and purified by washing with a large amount of methanol three times. Thereafter, the obtained white solid was vacuum-dried at 100 ° C. for 6 hours to obtain the desired cellulose derivative (trityl cellulose 2-ethylhexanoate, trityl substitution degree 0.1, 2-ethylhexanoyl substitution degree 1.4). Was obtained as a white powder (36.4 g).

<Synthesis Example 2: Synthesis of trityl cellulose 2-ethylhexanoate (P-2)>
In the same manner as in Synthesis Example 1 except that the amount of 2-ethylhexanoyl chloride was changed to 30.2 g, the same cellulose derivative (tritylcellulose octanoate, trityl substitution degree 0.2, 2-ethylhexanoyl substitution degree 1. 2) was obtained as a white powder (35.0 g).

<Synthesis Example 3: Synthesis of 4-methoxytriphenylmethylcellulose 2-ethylhexanoate (P-3)>
In the same manner as in Synthesis Example 1, except that trityl chloride was changed to 76.3 g of 4-methoxytriphenylmethyl chloride, the same cellulose derivatives (4-methoxytriphenylmethylcellulose 2-ethylhexanoate, 4-methoxytriphenylmethyl substitution) Degree 0.1, 2-ethylhexanoyl substitution degree 1.4) was obtained as white powder (38.5 g).

<Synthesis Example 4: Synthesis of tritylcellulose octanoate (P-4)>
The target cellulose derivative (trityl cellulose octanoate, trityl substitution degree 0.1, octanoyl substitution degree 1.4) except that 2-ethylhexanoyl chloride was changed to 60.3 g of octanoyl chloride in Synthesis Example 1 Was obtained as a white powder (35.5 g).

<Synthesis Example 5: Synthesis of trityl cellulose butyrate (P-5)>
In the same manner as in Synthesis Example 1, except that 2-ethylhexanoyl chloride was changed to 26.7 g of butyroyl chloride, the desired cellulose derivative (trityl cellulose butyrate, trityl substitution degree 0.1, butyroyl substitution degree 1.5) was obtained. Obtained as a white powder (30.5 g).

<Synthesis Example 6: Synthesis of trityl cellulose decanoate (P-6)>
The target cellulose derivative (trityl cellulose decanoate, trityl substitution degree 0.1, decanoyl substitution degree 1.5) was similarly obtained except that 2-ethylhexanoyl chloride was changed to 84.8 g of decanoyl chloride in Synthesis Example 1. Was obtained as a white powder (40.8 g).

<Synthesis Example 7: Synthesis of 2-chlorotriphenylmethylcellulose 2-ethylhexanoate (P-7)>
In the same manner as in Synthesis Example 1 except that trityl chloride was changed to 77.2 g of 2-chlorotriphenylmethyl chloride, the same cellulose derivatives (2-chlorotriphenylmethylcellulose 2-ethylhexanoate, 2-chlorotriphenylmethyl substitution) Degree 0.1, 2-ethylhexanoyl substitution degree 1.4) was obtained as white powder (38.8 g).

<Synthesis Example 8: Synthesis of 4-trimethyltriphenylmethylcellulose 2-ethylhexanoate (P-8)>
In the same manner as in Synthesis Example 1 except that trityl chloride was changed to 79.2 g of 4-trimethyltriphenylmethyl chloride, the same cellulose derivatives (4-trimethyltriphenylmethylcellulose 2-ethylhexanoate, 4-trimethyltriphenylmethyl substitution) Degree 0.1, 2-ethylhexanoyl substitution degree 1.4) was obtained as a white powder (37.7 g).

<Synthesis Example 9: Synthesis of tritylcellulose heptanate (P-9)>
In the same manner as in Synthesis Example 1, except that 2-ethylhexanoyl chloride was changed to 40.7 g of heptanoyl chloride, the target cellulose derivative (trityl cellulose heptanate, trityl substitution degree 0.1, heptanoyl substitution degree 1.6) was obtained. Obtained as a white powder (34.6 g).

<Synthesis Example 10: Synthesis of trityl cellulose nonanate (P-10)>
In the same manner as in Synthesis Example 1 except that 2-ethylhexanoyl chloride was changed to 39.0 g of nonanoyl chloride, the target cellulose derivative (trityl cellulose nonanate, trityl substitution degree 0.1, nonanoyl substitution degree 1.5) was obtained. Obtained as a white powder (35.0 g).

<Synthesis Example 11: Synthesis of trityl cellulose stearate (P-11)>
In the same manner as in Synthesis Example 1, except that 2-ethylhexanoyl chloride was changed to 112 g of stearoyl chloride, the target cellulose derivative (trityl cellulose stearate, trityl substitution degree 0.1, stearoyl substitution degree 1.4) was obtained as a white powder. (43.9 g).

<Synthesis of Comparative Compound 1: Synthesis of Cellulose 2-Ethylhexanoate (H-1)>
Into a 2 L three-necked flask equipped with a mechanical stirrer, thermometer, condenser, and dropping funnel, 20 g of cellulose (manufactured by Nippon Paper Industries Co., Ltd .: KC Flock W50) and 700 mL of dimethylacetamide were weighed and stirred at 120 ° C. for 2 hours. Next, 60 g of lithium chloride was added, and the mixture was further stirred for 1 hour, and then the cellulose was dissolved by returning the reaction solution to room temperature. Thereafter, 29.8 mL of pyridine and 30.2 g of 2-ethylhexanoyl chloride were added dropwise at room temperature, and the mixture was stirred at 60 ° C. for 3 hours. After the reaction, when the obtained solution was put into 2 L of a methanol mixed solvent, a white solid was precipitated. The obtained white solid was separated by suction filtration and purified by washing with a large amount of methanol three times. Thereafter, the obtained white solid was vacuum-dried at 100 ° C. for 6 hours to obtain a cellulose derivative (cellulose 2-ethylhexanoate, substitution degree of 2-ethylhexanoyl 1.1) as a white powder (33. 5g).

<Synthesis of Comparative Compound 2: Synthesis of Tritylcellulose Benzoate (H-2)>
In the same manner as in Synthesis Example 1, except that 2-ethylhexanoyl chloride was changed to 52.2 g of benzoyl chloride, the target cellulose derivative (trityl cellulose benzoate, trityl substitution degree 0.1, benzoyl substitution degree 1.0) was treated with white powder. Obtained as a body (34.6 g).

<Synthesis of Comparative Compound 3: Synthesis of Trityl Cellulose Acetate (H-6)>
In the same manner as in Synthesis Example 1, except that 2-ethylhexanoyl chloride was changed to 29.0 g of acetyl chloride, the desired cellulose derivative (trityl cellulose acetate, trityl substitution degree 0.1, acetyl substitution degree 2.0) was treated with white powder. Obtained as a body (30.5 g).

<Synthesis of Comparative Compound 4: Synthesis of Tritylcellulose Propionate (H-7)>
In the same manner as in Synthesis Example 1, except that 2-ethylhexanoyl chloride was changed to 34.2 g of propionyl chloride, the target cellulose derivative (trityl cellulose propionate, trityl substitution degree 0.1, propionyl substitution degree 1.8) was obtained. Obtained as a white powder (31.6 g).

In addition, about the compound obtained above, the kind of the functional group substituted by the hydroxyl group contained in a cellulose, the substitution degree are described in Cellulose Communication 6,73-79 (1999) and Chrality 12 (9), 670-674. Using this method, observation and determination were performed by ¹ H-NMR or ¹³ C-NMR.

<Measurement of physical properties of cellulose derivative>
Table 1 shows the number average molecular weight (Mn), the weight average molecular weight (Mw), the molecular weight distribution (MWD = Mw / Mn), and the glass transition temperature (Tg) of the obtained cellulose derivative. These measuring methods are as follows.

[Molecular weight and molecular weight distribution]
The number average molecular weight (Mn), the weight average molecular weight (Mw), and the molecular weight distribution (MWD) were measured using gel permeation chromatography (GPC). Specifically, tetrahydrofuran was used as a solvent, polystyrene gel was used, and the molecular weight was determined using a conversion molecular weight calibration curve obtained in advance from the constituent curve of standard monodisperse polystyrene. As the GPC apparatus, HLC-8220 GPC (manufactured by Tosoh Corporation) was used.

[Glass-transition temperature]
Using a differential scanning calorimeter (product number: DSC6200, manufactured by Seiko Electronics Co., Ltd.), the temperature was raised at 10 ° C./min and measured.

<Example 1: Production of molded body made of cellulose derivative (production of test piece)>
The cellulose derivative (P-1) obtained above is supplied to an injection molding machine (Imoto Seisakusho, semi-automatic injection molding machine), cylinder temperature 200 ° C., mold temperature 30 ° C., injection pressure 1.5 kgf / Multipurpose test pieces (impact test pieces and thermal deformation test pieces) of 4 × 10 × 80 mm were formed at cm ² .

<Examples 2 to 11 and Comparative Examples 1 to 7>
Instead of the cellulose derivative (P-1) in Example 1, cellulose derivatives (P-2) to (P-11) and cellulose derivatives (H-1), (H-2), (H-3) as comparative compounds ) (L-70, Daicel Chemical Industries, Ltd., acetyl substitution degree 2.4), (H-4) (Aldrich cellulose triacetate, acetyl substitution degree 2.9), (H-5) (Eastman Chemical) A test piece was prepared in the same manner as in Example 1 except that CAP482-20, acetyl substitution degree 0.1, propionyl substitution degree 2.5), and (H-6) and (H-7) were used.

<Measurement of physical properties of test piece>
About the obtained test piece, the Charpy impact strength was measured in accordance with the following method. The results are shown in Table 2.

[Charpy impact strength]
In accordance with ISO 179, a notch having an incident angle of 45 ± 0.5 ° and a tip of 0.25 ± 0.05 mm is formed on a test piece molded by injection molding, 23 ° C. ± 2 ° C., 50% ± 5% RH After adjusting for 48 hours or more, the impact strength was measured edgewise with a Charpy impact tester.

As is clear from the results in Table 2, the tritylcellulose benzoate of Comparative Example 2, the acetylcellulose of Comparative Examples 3 and 4, and the tritylacetylcellulose of Comparative Example 6 do not exhibit thermoplasticity, whereas Examples 1 to 11 This cellulose derivative has thermoplasticity and is found to be moldable. Also, the cellulose derivatives of Examples 1 to 11 are more resistant to impact than the 2-ethylhexanoyl cellulose of Comparative Example 1 having a thermoplastic property, CAP482-20 of Comparative Example 5 and tritylpropionyl cellulose of Comparative Example 7. Significant improvement is seen.
That is, according to the cellulose derivative of the present invention, it can be seen that excellent effects of developing thermoplasticity and improving impact resistance can be obtained.

Claims (10)

A cellulose derivative having a group represented by the following general formula (I) and a group represented by the following general formula (II).

(In General Formula (I) and General Formula (II), R ₁ , R ₂ , and R ₃ each independently represent a halogen atom, an alkyl group, or an alkoxy group. R ₄ has 3 to 17 carbon atoms. N ₁ , n ₂ , and n ₃ each independently represents an integer of 0 to 5. * is bonded to a carbon atom at the 2nd, 3rd or 6th position of the glucose ring of cellulose. Represents the part to be performed.) The cellulose derivative according to claim 1, wherein R ₄ in the general formula (II) is an aliphatic group having a branched structure. The cellulose derivative according to claim 1 or 2, wherein R ₄ in the general formula (II) is an aliphatic group having 3 to 9 carbon atoms. The cellulose derivative according to claim 1 or 2, wherein R ₄ in the general formula (II) is an aliphatic group having 6 to 8 carbon atoms. The cellulose derivative according to claim ₁ , wherein n ₁ , n ₂ , and n ₃ in the general formula (I) are all 0.   The resin composition containing the cellulose derivative in any one of Claims 1-5.   The molded object obtained by shape | molding the cellulose derivative in any one of Claims 1-5, or the resin composition of Claim 6.   A housing for electrical and electronic equipment comprising the molded body according to claim 7.   A method for producing a cellulose derivative according to any one of claims 1 to 5, wherein a step of reacting cellulose with a triphenylmethyl halide or a triphenylmethyl halide derivative in the presence of a base, and an acid chloride or an acid anhydride And a step of reacting the cellulose derivative.   The method for producing a cellulose derivative according to claim 9, wherein the step of reacting the triphenylmethyl halide or triphenylmethyl halide derivative and the step of reacting the acid chloride or acid anhydride are performed in one reaction vessel.