WO2011122421A1

WO2011122421A1 - Resin composition, molded products, and housing for electrical or electronic equipment

Info

Publication number: WO2011122421A1
Application number: PCT/JP2011/057032
Authority: WO
Inventors: 健志梅原; 哲文高本
Original assignee: 富士フイルム株式会社
Priority date: 2010-03-30
Filing date: 2011-03-23
Publication date: 2011-10-06
Also published as: JP2011207193A

Abstract

Provided is a resin composition which can yield molded products with excellent flame retardance and impact strength. Also provided are: molded products with excellent flame retardance and impact resistance; and a housing for electrical or electronic equipment, which is constituted of one or more of the molded products. A resin composition comprising a cellulose ester and an aromatic polycarbonate resin, which has a mass ratio of the aromatic polycarbonate resin to the cellulose ester of 0.4 to 1, with the aromatic polycarbonate resin having a number-average molecular weight of 10000 to 26000, and the morphology of which is a sea-island type phase-separated structure which is composed of both a continuous phase of the aromatic polycarbonate resin and a dispersed phase of the cellulose ester.

Description

Resin composition, molded body, and casing for electrical and electronic equipment

The present invention relates to a resin composition, a molded body, and a housing for electric and electronic equipment.

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 for electrical and electronic equipment and protects the drive machine. Are used in large quantities. 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 1).
However, further improvements are required from the perspective of aiming for a more complete carbon neutral material.

Cellulose is gaining great attention as a biomass material that can be regenerated on the earth obtained from plants and as a biodegradable material in the environment. Cellulose is not only used for paper, but cellulose derivatives, for example, cellulose acetate, cellulose acetate propionate, cellulose acetate butyrate, and cellulose acetate phthalate are used as film materials and the like.

For example, Patent Document 2 describes a transmission type light scattering sheet comprising a sea polymer and two kinds of island polymers. Specifically, cellulose triacetate is used as the sea polymer, polymethyl methacrylate is used as the island polymer, and acrylonitrile. -Sheets of styrene copolymers are disclosed.
In Patent Document 3, a sheet is produced by extrusion molding using a cellulose-based resin composition having a continuous phase composed of a plasticized cellulose derivative and a dispersed phase composed of a thermoplastic resin such as polystyrene. It is described to do.

Japanese Unexamined Patent Publication No. 2008-24919 Japanese Unexamined Patent Publication No. 2000-239541 Japanese Unexamined Patent Publication No. 2003-306577

According to the study by the present inventors, a resin composition containing a cellulose ester has a sea-island structure in which the morphology is a continuous phase composed of a cellulose ester and a dispersed phase composed of another polymer as described in Patent Document 2 or 3. In some cases, it has been found that molded articles obtained from the resin composition have problems in terms of impact strength and flame retardancy.

The present invention has been made by paying attention to the above problems in a resin composition using a cellulose ester, and its purpose is to provide flame retardancy and impact as a novel resin composition that can be used in various applications. It is providing the resin composition from which the molded object excellent in intensity | strength is obtained. Another object of the present invention is to provide a molded article excellent in flame retardancy and impact strength, and a casing for electrical and electronic equipment composed of the molded article.

As a result of intensive studies to achieve the above object, the present inventors have found that the above object can be achieved by the following means.

1.
A resin composition comprising a cellulose ester and an aromatic polycarbonate resin,
The weight ratio of the aromatic polycarbonate resin to the cellulose ester is 0.4 to 1,
The aromatic polycarbonate resin has a number average molecular weight of 10,000 to 26000,
A resin composition having a sea-island type phase-separated structure in which the morphology includes a continuous phase of an aromatic polycarbonate resin and a dispersed phase of a cellulose ester.
2.
2. The resin composition according to 1 above, wherein the cellulose ester is at least one cellulose ester selected from the group consisting of cellulose acetate, cellulose acetate propionate, and cellulose acetate butyrate.
3.
Furthermore, the resin composition of said 1 or 2 containing the at least 1 sort (s) of flame retardant chosen from the group which consists of a phosphorus flame retardant, a nitrogen compound flame retardant, and a silicone flame retardant.
4).
4. The resin composition as described in 3 above, wherein the phosphorus flame retardant is a phosphate ester.
5.
5. The resin composition according to any one of 1 to 4, further comprising a fluorine-based resin.
6).
A molded body obtained from a resin composition containing a cellulose ester and an aromatic polycarbonate resin,
A sea-island type phase-separated structure whose morphology has a continuous phase of aromatic polycarbonate resin and a dispersed phase of cellulose ester,
A molded product having an average length of the minor axis of the dispersed phase of 1.0 μm or more and an average aspect ratio (major axis / minor axis) of the dispersed phase of 5 or more.
7).
6. A molded product obtained by molding the resin composition according to any one of 1 to 5 above.
8).
A housing for electrical and electronic equipment comprising the molded article according to 6 or 7 above.

According to the resin composition of the present invention, a molded article having excellent flame retardancy and impact strength can be obtained. Moreover, since the molded object of this invention is excellent in a flame retardance and impact strength, it can be used conveniently, for example as components, such as a motor vehicle, a household appliance, and an electric electronic device, a machine part, a house and a building material. Moreover, since the resin composition of the present invention uses a cellulose ester resin obtained from cellulose, which is a plant-derived resin, it can be replaced with a conventional petroleum-derived resin as a material that can contribute to prevention of global warming. .

(I) Resin composition The present invention is a resin composition comprising a cellulose ester and an aromatic polycarbonate resin,
The weight ratio of the aromatic polycarbonate resin to the cellulose ester is 0.4 to 1,
The aromatic polycarbonate resin has a number average molecular weight of 10,000 to 26000,
The present invention relates to a resin composition having a sea-island type phase separation structure (sea-island structure) in which the morphology includes a continuous phase of an aromatic polycarbonate resin and a dispersed phase of cellulose ester.

1. Cellulose ester The resin composition of the present invention has a sea-island structure in which the morphology has a continuous phase and a dispersed phase, and the cellulose ester forms the dispersed phase. The shape of a dispersed phase is not specifically limited, For example, arbitrary shapes, such as scale shape, columnar shape, and spherical shape, may be sufficient. This is because the shape of the dispersed phase is changed by heat, pressurization, and shearing force when it is molded into a molded body, so that there is almost no influence on the obtained molded body.
The average length of the minor axis of the dispersed phase is not particularly limited, but is preferably 1.0 μm or more, more preferably 1.0 to 20 μm, and still more preferably 1.0 to 10 μm.
The average aspect ratio (major axis / minor axis) of the dispersed phase is not particularly limited, but is preferably 5 or more, more preferably 5 to 100, and still more preferably 10 to 50.
The morphology of the resin composition can be observed with, for example, an electron microscope.

The cellulose ester in the present invention is not particularly limited. Cellulose esters are usually produced by esterifying cellulose such as wood pulp (conifer pulp, hardwood pulp) and cotton linter pulp.

The cellulose ester can be produced by a conventional esterification method in which cellulose is reacted with an acylating agent, and can be produced through a saponification or aging step as necessary. Cellulose esters are usually prepared by activating pulp (cellulose) with an activating agent (activation step) and then preparing an ester (such as a triester) with an acylating agent using a catalyst such as sulfuric acid (acylation step). ), Saponification (hydrolysis) and aging to adjust the degree of esterification (saponification and aging step). In the case of cellulose acetate, it can be produced by a conventional method such as a sulfuric acid catalyst method, an acetic acid method, or a methylene chloride method.

The ratio of the acylating agent in the acylation step can be selected within a range that provides a desired degree of acylation (eg, degree of acetylation). For example, 230 to 300 parts by mass, preferably 240 parts per 100 parts by mass of pulp (cellulose). 290 parts by mass, more preferably 250-280 parts by mass. In the case of cellulose acetate, for example, acetic anhydride can be used as the acylating agent.

As the acylation or aging catalyst, sulfuric acid is usually used. The amount of sulfuric acid used is usually 0.5 to 15 parts by mass, preferably 5 to 15 parts by mass, and more preferably 5 to 10 parts by mass with respect to 100 parts by mass of cellulose. The temperature for saponification / ripening can be selected from the range of 40 to 160 ° C., for example, 50 to 70 ° C.
Furthermore, in order to neutralize the remaining sulfuric acid, it may be treated with an alkali.

Examples of the cellulose ester include organic acid esters [cellulose carboxylic acid esters with carboxylic acids having 2 to 6 carbon atoms such as cellulose acetate (cellulose acetate), cellulose propionate, cellulose butyrate, etc.), mixed esters (cellulose acetate, etc.). Propionate, cellulose dicarboxylic acid ester with carboxylic acid having 2 to 6 carbon atoms such as cellulose acetate butyrate), graft (polycaprolactone grafted cellulose acetate, etc.), inorganic acid ester (cellulose nitrate, cellulose sulfate, phosphorus Acid cellulose, etc.), organic acids, inorganic acid mixed esters (such as cellulose nitrate acetate) and the like.
In the present invention, among these cellulose esters, cellulose organic acid esters modified with an organic acid are preferable, and cellulose organic acid esters modified with an organic acid having 2 to 12 carbon atoms are more preferable. Specifically, cellulose diacetate, cellulose triacetate, cellulose propionate, cellulose acetate propionate, cellulose butyrate, cellulose acetate butyrate, cellulose propionate butyrate and the like are preferable, cellulose acetate, cellulose propionate, Cellulose butyrate, cellulose acetate propionate, cellulose acetate butyrate, cellulose propionate butyrate are more preferred, and cellulose acetate, cellulose acetate propionate and cellulose acetate butyrate are in terms of viscosity ratio with aromatic polycarbonate resin Especially preferred is cellulose acetate propionate. These cellulose esters may be used alone or in combination of two or more.

The total average degree of substitution (acyl substitution degree) of the cellulose ester is preferably 2.0 to 2.8, more preferably 2.2 to 2.7 from the viewpoint of impact resistance.
In the case of cellulose acetate, the average degree of acetylation can be selected from the range of 30 to 62.5%, and the average degree of acetylation is usually 43.7 to 62.5% (average substitution degree of acetyl group 1.7 to 3), preferably Is 45 to 62.5% (average substitution degree 1.8 to 3), more preferably 48 to 62.5% (average substitution degree 2 to 3).

The degree of polymerization of the cellulose ester is not particularly limited, and is a viscosity average degree of polymerization of 200 to 400, preferably 250 to 400, and more preferably 270 to 350. By setting the viscosity average degree of polymerization within this range, it becomes easy to form a dispersed phase having a sea-island structure.
The molecular weight of the cellulose ester in the present invention is preferably a number average molecular weight (Mn) in the range of 50 × 10 ³ to 100 × 10 ³ , more preferably in the range of 55 × 10 ³ to 80 × 10 ³ , and 60 × 10 ³ to A range of 75 × 10 ³ is most preferred. The weight average molecular weight (Mw) is preferably in the range of 100 × 10 ³ to 300 × 10 ³ , more preferably in the range of 140 × 10 ³ to 275 × 10 ³ , and in the range of 150 × 10 ³ to 250 × 10 ³ . Is most preferred. By setting the average molecular weight within this range, the moldability, the mechanical strength of the molded body, and the like can be improved.
The molecular weight distribution (MWD) is preferably in the range of 1.1 to 10.0, and more preferably in the range of 1.5 to 8.0. By setting the molecular weight distribution within this range, moldability and the like can be improved.
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, N-methylpyrrolidone is used as a solvent, a polystyrene gel is used, and the molecular weight can be determined using a conversion molecular weight calibration curve obtained in advance from a standard monodisperse polystyrene constituent curve. As the GPC apparatus, HLC-8220 GPC (manufactured by Tosoh Corporation) can be used.

The cellulose ester in the present invention can be produced by a known method. Moreover, a commercial item can also be used. For example, as cellulose acetate propionate, “482-20 (acetyl substitution degree: 0.1, propionyl substitution degree: 2.5, Mn: 73000, Mw: 234000)” manufactured by Eastman Chemical Co., Ltd. is cellulose acetate butyrate. As the rate, "cellulose acetate butyrate (acetyl substitution degree: 0.4, butyrate substitution degree: 1.1, Mn: 70000)" manufactured by Aldrich, Eastman Chemical Co., "381-20 (acetyl substitution degree: 0. 6, butyryl substitution degree: 1.3, Mw: 70,000) "is a cellulose diacetate manufactured by Daicel Chemical Industries," L-70 (acetyl substitution degree: 2.45, Mn: 65000, Mw: 200000) ", cellulose As triacetate, "FR" made by Daicel Chemical (Acetyl substitution degree: 2.79, Mn: 66000, Mw: 186000) ", and the like.

The content of the cellulose ester contained in the resin composition of the present invention is not particularly limited. The cellulose ester is preferably contained in an amount of 30 to 70% by mass, more preferably 40 to 65% by mass, and still more preferably 50 to 60% by mass with respect to the total solid content of the resin composition. By setting it as this range, it becomes easy to form a sea-island structure using cellulose ester as a dispersed phase. In addition, the impact strength, flame retardance, and moldability of the molded body can be further suppressed while having significance as a carbon neutral material.

2. Aromatic polycarbonate-based resin The resin composition of the present invention has a sea-island structure in which the morphology has a continuous phase and a dispersed phase, and the aromatic polycarbonate-based resin constitutes the continuous phase.

Examples of the aromatic polycarbonate-based resin include thermoplastic aromatic polycarbonate polymers or copolymers obtained by reacting an aromatic dihydroxy compound with phosgene or a carbonic acid diester.
Examples of the aromatic dihydroxy compound include 2,2-bis (4-hydroxyphenyl) propane (= bisphenol A), tetramethylbisphenol A, bis (4-hydroxyphenyl) -P-diisopropylbenzene, hydroquinone, resorcinol, 4, 4-dihydroxybiphenyl, 2,2-bis (4-hydroxy-3,5-dimethylphenyl) propane, bis (4-hydroxyphenyl) methane, 1,1-bis (4-hydroxyphenyl) ethane, 2,2- Bis (4-hydroxyphenyl) butane, 2,2-bis (4-hydroxy-3,5-diphenyl) butane, 2,2-bis (4-hydroxy-3,5-diethylphenyl) propane, 2,2- Bis (4-hydroxy-3,5-diethylphenyl) propane, 1,1-bis (4-hydroxy) Rokishifeniru) cyclohexane, 1-phenyl-1,1-bis (4-hydroxyphenyl) ethane. These can be used alone or as a mixture. Bisphenol A is preferable. Furthermore, for the purpose of further enhancing the flame retardancy, a compound in which one or more tetraalkylphosphonium sulfonates are bonded to the above aromatic dihydroxy compound, or a polymer or oligomer having a siloxane structure and containing both terminal phenolic OH groups is used. Can do.

The aromatic polycarbonate resin that can be used in the present invention is preferably a polycarbonate resin derived from 2,2-bis (4-hydroxyphenyl) propane, or 2,2-bis (4-hydroxyphenyl) propane. And polycarbonate copolymers derived from other aromatic dihydroxy compounds. Further, two or more aromatic polycarbonate resins may be used in combination.

The molecular weight of the aromatic polycarbonate resin in the present invention is in the range of 10000 to 26000 in terms of number average molecular weight, preferably in the range of 12000 to 25500, and more preferably in the range of 15000 to 25000. By setting the number average molecular weight of the aromatic polycarbonate resin within this range, the aromatic polycarbonate resin has a viscosity at which it is easy to form a continuous phase in the sea-island structure, and the resulting molded article has excellent impact strength and flame retardancy. It will be a real thing.
The number average molecular weight is determined using a converted molecular weight calibration curve obtained in advance from a constituent curve of standard monodisperse polystyrene using N-methylpyrrolidone as a solvent and using a polystyrene gel. As the GPC apparatus, HLC-8220 GPC (manufactured by Tosoh Corporation) can be used.

The method for producing the aromatic polycarbonate resin in the present invention is not limited, and may be a phosgene method (interfacial polymerization method), a melting method (transesterification method), or a non-phosgene method using carbon dioxide as a raw material. Can be manufactured. Furthermore, an aromatic polycarbonate resin prepared by a melting method and having an adjusted amount of terminal OH groups can be used.

Furthermore, as the aromatic polycarbonate resin, not only virgin raw materials but also aromatic polycarbonate resins regenerated from used products, so-called material recycled aromatic polycarbonate resins can be used. Used products include optical recording media such as optical discs, light guide plates, automobile window glass and automobile headlamp lenses, vehicle transparent members such as windshields, containers such as water bottles, eyeglass lenses, soundproof walls and glass windows, waves A building member such as a plate is preferred. In addition, as the recycled aromatic polycarbonate resin, non-conforming product, pulverized product obtained from sprue or runner or pellets obtained by melting them can be used.

In the present invention, a commercially available product can be used as the aromatic polycarbonate resin. For example, Panlite L1225Y: Polycarbonate resin having a bisphenol A skeleton (Mn = 25000) (manufactured by Teijin Chemicals Ltd.), Panlite L1225L: Bisphenol A Polycarbonate resin having a skeleton (Mn = 21000) (manufactured by Teijin Chemicals Ltd.), Panlite L1225LL: Polycarbonate resin having a bisphenol A skeleton (Mn = 18000) (manufactured by Teijin Chemicals Ltd.), Taflon AC1030: bisphenol A polycarbonate resin having an A skeleton (Mn = 18000) (manufactured by Teijin Chemicals Ltd.) is exemplified.

The content of the aromatic polycarbonate resin contained in the resin composition of the present invention is not particularly limited.
The aromatic polycarbonate resin is preferably contained in an amount of 20 to 60% by mass, more preferably 30 to 55% by mass, and still more preferably 35 to 50% by mass with respect to the total solid content of the resin composition.
In the resin composition of the present invention, the mass ratio of the aromatic polycarbonate resin to the cellulose ester (aromatic polycarbonate resin / cellulose ester) is 0.4 to 1, preferably 0.5 to 1. More preferably, it is 0.6 to 1. By setting it as this range, it becomes easy to form a sea-island structure using an aromatic polycarbonate resin as a continuous phase, and the impact strength and flame retardancy of the molded product can be further improved.

3. Flame retardant The resin composition of the present invention may contain a flame retardant. By containing a flame retardant, a flame retardant effect such as reduction or suppression of the combustion rate can be improved.
The flame retardant is not particularly limited, and a conventional flame retardant can be used. For example, a nitrogen compound flame retardant, an inorganic flame retardant, a halogen flame retardant, a phosphorus flame retardant, a silicone flame retardant, and the like can be given. In the present invention, a flame retardant containing at least one selected from the group consisting of a phosphorus flame retardant, a nitrogen compound flame retardant, and a silicone flame retardant is preferable. These flame retardants are pyrolyzed when they are combined with resin or in molding process, and hydrogen halide is generated in comparison with commonly used brominated flame retardants and chlorinated flame retardants. It does not corrode or deteriorate the work environment, and is less likely to have a negative impact on the environment due to the generation of harmful substances such as dioxins when halogens dissipate during incineration. There is.
Furthermore, a flame retardant containing a phosphorus-based flame retardant is more preferable from the viewpoint of hygroscopicity. Since the phosphorus-based flame retardant is excellent in compatibility with the aromatic polycarbonate resin, it also has an advantage of contributing to the formation of a sea-island structure.

The phosphorus-containing flame retardant is not particularly limited, and a commonly used one can be used. For example, organic phosphorus compounds such as phosphoric acid esters, phosphoric acid condensed esters, and polyphosphates may be mentioned. From the viewpoint of hygroscopicity, phosphoric acid esters and phosphoric acid condensed esters are preferable.

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 -2-acryloyloxyethyl phosphate, diphenyl-2-methacryloyloxyethyl phosphate, melamine phosphate, dimelamine phosphate, melamine pyrophosphate, triphenylphosphine oxide, tricresylphosphine oxide, diphenyl methanephosphonate, diethyl phenylphosphonate Can be mentioned.

Examples of the phosphoric acid condensed ester 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 esters such as the above, condensates of the above phosphoric acid esters and the like.

The molecular weights of these phosphate esters are not particularly limited, but are preferably 400 to 1500 and more preferably 500 to 1000 from the viewpoint of suppressing bleed out.

In addition, polyphosphates composed of salts of phosphoric acid, polyphosphoric acid and metals of Groups 1 to 14 of the periodic table, ammonia, aliphatic amines, and aromatic amines 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.

These phosphorus flame retardants can be produced by a known method. Commercially available products can also be used, such as “PX-200, 1,3-phenylenebis (di-2,6-xylenyl phosphate) (manufactured by Daihachi Chemical)” which is a phosphoric acid condensed ester. “PX-202 (manufactured by Daihachi Chemical)” and the like can be mentioned.
These phosphorus-based flame retardants may be used alone or in combination of two or more.

Nitrogen compound flame retardants include aliphatic amine compounds, aromatic amine compounds, nitrogen-containing heterocyclic compounds, cyanide compounds, aliphatic amides, aromatic amides, urea, thiourea, nitrogen-containing sulfates, sulfamate salts, melamines Examples include cyanurate. Examples of the aliphatic amine include ethylamine, butylamine, diethylamine, ethylenediamine, butylenediamine, triethylenetetramine, 1,2-diaminocyclohexane, 1,2-diaminocyclooctane and the like. Examples of the aromatic amine include aniline and phenylenediamine. Examples of nitrogen-containing heterocyclic compounds include uric acid, adenine, guanine, 2,6-diaminopurine, 2,4,6-triaminopyridine, and triazine compounds. Examples of the cyan compound include dicyandiamide. Examples of the aliphatic amide include N, N-dimethylacetamide. Examples of aromatic amides include N, N-diphenylacetamide. Examples of the nitrogen-containing sulfate include ammonium sulfate, dimethylamine sulfate, trimethylamine sulfate, diethylamine sulfate, triethylamine sulfate, diphenylamine sulfate, triphenylamine sulfate, guanidine sulfate, guanylurea sulfate, melamine sulfate, and combinations thereof. Guanidine sulfate, guanyl urea sulfate, melamine sulfate, or combinations thereof. Of these, melamine sulfate and guanidine sulfate are more preferable, and melamine sulfate is more preferable.
Examples of the sulfamate include those having 2 or more nitrogen atoms in the molecule. Specific examples include ammonium sulfamate, guanidine sulfamate, guanylurea sulfamate, melamine sulfamate, dimethylamine sulfamate, trimethylamine sulfamate, diethylamine sulfamate, triethylamine sulfamate, triphenylamine sulfamate or a combination thereof. Among them, guanidine sulfamate, guanylurea sulfamate, melamine sulfamate or a combination thereof is preferable, guanidine sulfamate, guanylurea sulfamate, diethylamine sulfamate, triethylamine sulfamate is more preferable, and guanidine sulfamate and guanylurea sulfamate are preferable. Further preferred.

The triazine compounds exemplified above are nitrogen-containing heterocyclic compounds having a triazine skeleton, and are triazine, melamine, benzoguanamine, methylguanamine, cyanuric acid, melamine cyanurate, melamine isocyanurate, trimethyltriazine, triphenyltriazine, amelin, and amelide. And thiocyanuric acid, diaminomercaptotriazine, diaminomethyltriazine, diaminophenyltriazine, diaminoisopropoxytriazine and the like.

As melamine cyanurate or melamine isocyanurate, an adduct of cyanuric acid or isocyanuric acid and a triazine compound is preferable, usually an addition having a composition of 1 to 1 (molar ratio), optionally 1 to 2 (molar ratio). You can list things. Melamine cyanurate and melamine isocyanurate are produced by known methods. For example, a mixture of melamine and cyanuric acid or isocyanuric acid is made into a water slurry and mixed well to form both salts in the form of fine particles. Thereafter, the slurry is generally obtained in the form of powder after filtration and drying. The salt does not need to be completely pure, and some unreacted melamine, cyanuric acid or isocyanuric acid may remain. The average particle size of melamine cyanurate or melamine isocyanurate before blending with the resin is preferably 100 to 0.01 μm, more preferably 80 from the viewpoint of flame retardancy, mechanical strength and surface property of the molded product. ~ 1 μm.

Among nitrogen compound-based flame retardants, nitrogen-containing heterocyclic compounds are preferable, among which triazine compounds are preferable, and melamine cyanurate is more preferable.

Further, when the dispersibility of the nitrogen compound flame retardant is poor, a dispersant such as tris (β-hydroxyethyl) isocyanurate or a known surface treatment agent such as polyvinyl alcohol or metal oxide may be used in combination. Good.
These nitrogen compound flame retardants may be used singly or in combination of two or more.

Examples of the silicone flame retardant include a two-dimensional or three-dimensional organosilicon compound, 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 flame retardants other than phosphorus flame retardants, nitrogen compound flame retardants, and silicone flame retardants 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, tungstic metal salt Inorganic flame retardants such as composite oxides of tungsten and metalloid, zirconium compounds, guanidine compounds, fluorine compounds, graphite, and swellable graphite can be used. A flame retardant may be used individually by 1 type, or may be used in combination of 2 or more types.

When the resin composition of the present invention contains a flame retardant, its content is not limited, but is preferably 30% by mass or less, more preferably 10 to 25% by mass, based on the total solid content of the resin composition. By setting it as this range, a flame retardance, impact resistance, brittleness, etc. can be improved more and generation | occurrence | production of pellet blocking can be suppressed.

4). Fluorine-based resin The resin composition of the present invention preferably further contains a fluorine-based resin. This is to prevent drip when the molded body burns and to obtain higher flame retardancy.
The fluororesin in the present invention is a resin containing fluorine in a substance molecule, specifically, polytetrafluoroethylene, polyhexafluoropropylene, tetrafluoroethylene / hexafluoropropylene copolymer, tetrafluoroethylene. / Perfluoroalkyl vinyl ether copolymer, tetrafluoroethylene / ethylene copolymer, hexafluoropropylene / propylene copolymer, polyvinylidene fluoride, vinylidene fluoride / ethylene copolymer, etc., among which polytetrafluoro Ethylene, tetrafluoroethylene / perfluoroalkyl vinyl ether copolymer, tetrafluoroethylene / hexafluoropropylene copolymer, tetrafluoroethylene / ethylene copolymer, polyvinylidene fluoride In particular, polytetrafluoroethylene and tetrafluoroethylene / ethylene copolymers are preferred, and polytetrafluoroethylene is more preferred, and polytetrafluoroethylene-containing mixed powder comprising polytetrafluoroethylene particles and an organic polymer. The body is also preferably used. The molecular weight of the fluororesin such as polytetrafluoroethylene is preferably in the range of 100,000 to 10,000,000, more preferably in the range of 100,000 to 1,000,000, especially for the extrudability and flame retardancy of the present invention. effective. Commercially available products of polytetrafluoroethylene include “Teflon (registered trademark)” 6-J, “Teflon (registered trademark)” 6C-J, and “Teflon (registered trademark)” 62 manufactured by Mitsui DuPont Fluorochemical Co., Ltd. -J, “Full-on” CD1 and CD076 manufactured by Asahi IC Fluoropolymers Co., Ltd. are commercially available. In addition, as a commercial product of a polytetrafluoroethylene-containing mixed powder composed of polytetrafluoroethylene particles and an organic polymer, it is commercially available as “Metabrene (registered trademark)” A series from Mitsubishi Rayon Co., Ltd. METABLEN (registered trademark) “A-3000”, “METABBRENE (registered trademark)” A-3800 and the like are commercially available. In addition, polytetrafluoroethylene “Teflon (registered trademark)” 6-J and the like are prone to agglomerate, and when mixed with other resin compositions mechanically with a Henschel mixer or the like, agglomeration may occur due to aggregation. There are problems in handling and dispersibility depending on conditions. On the other hand, a polytetrafluoroethylene-containing mixed powder composed of polytetrafluoroethylene particles and an organic polymer is excellent in handling properties and dispersibility, and is particularly preferably used. The polytetrafluoroethylene-containing mixed powder composed of the polytetrafluoroethylene particles and the organic polymer is not limited, but polytetrafluoroethylene disclosed in Japanese Patent Application Laid-Open No. 2000-226523. Examples thereof include polytetrafluoroethylene-containing mixed powder composed of particles and an organic polymer. Examples of the organic polymer include aromatic vinyl monomers, acrylate monomers, and vinyl cyanide. An organic polymer containing 10% by mass or more of a monomer, and may be a mixture thereof. The polytetrafluoroethylene content in the polytetrafluoroethylene-containing mixed powder is 0.1% by mass to 90% by mass. It is preferable that it is mass%.

The blending amount of the fluororesin in the resin composition of the present invention is preferably 3 to 0.01% by mass, more preferably 2 to 0.02% by mass, and still more preferably 1 to 0.03% by mass. . By setting it as this range, a flame retardance can be improved more, suppressing the influence on a moldability.

5. Resin Composition The resin composition of the present invention contains a cellulose ester resin and an aromatic polycarbonate resin, and can contain a flame retardant and a fluorine resin as necessary. In addition to the above-described components, the resin composition of the present invention may contain various additives such as a plasticizer, a compatibilizer, an antioxidant, and a filler (reinforcing material) as necessary.

The resin composition of the present invention may contain a plasticizer. Thereby, a moldability can be improved further. As the plasticizer, those commonly used for polymer molding can be used. For example, phosphate esters such as triphenyl phosphate (TPP) and tricresyl phosphate (TCP), dimethyl phthalate (DMP), diethyl phthalate (DEP), dibutyl phthalate (DBP), dioctyl phthalate (DOP), di-2- Phthalate esters such as ethylhexyl phthalate (DEHP), fatty acid esters such as butyl oleate, methyl acetyl ricinoleate, dibutyl sebacate, citrate esters such as acetyl tributyl citrate (OACTB), trimellitic acid esters, 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, sebashi Dibutyl, and include 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, and 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 benzoate 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, it may be one type or two or more types, and the content thereof is preferably 30% by mass or less, based on the total solid content of the resin composition, 0.005 to It is more preferably 20% by mass, still more preferably 0.01 to 10% by mass.

The resin composition of the present invention may contain a compatibilizing agent. The compatibilizing agent is used for compatibilizing the cellulose ester and the aromatic polycarbonate resin in the present invention. The compatibilizing agent can further improve performance such as impact resistance of the molded article by improving the interfacial strength between the cellulose ester and the aromatic polycarbonate resin.

In the present invention, the compatibilizing agent preferably has a reactive group, and more preferably a carboxylic acid anhydride or a compound having at least one selected from an epoxy group, an isocyanate group, and an oxazoline group.
Preferred compatibilizers include polymers modified with carboxylic acid anhydrides, epoxy groups, isocyanate groups, and oxazoline groups, block copolymers, graft polymers, random copolymers, and various nonionic surfactants. Agents, coupling agents, and crosslinking agents.
Although the compatibilizer is not particularly limited, specifically, Modiper series manufactured by Nippon Oil & Fats Co., Ltd., Bond First, Bondine series manufactured by Sumitomo Chemical Co., Ltd., Lexpearl series manufactured by Nippon Oil Co., Ltd., Commercial products such as Reseda series manufactured by Toagosei Co., Ltd., Alfon series, Epocross series manufactured by Nippon Shokubai Co., Ltd., and Duranate series manufactured by Asahi Kasei Chemicals Co., Ltd. (both are trade names) are preferably used. In addition, the compatibilizer is not limited to these, and the compatibilizer described in “Plastic compatibilizer development / evaluation / recycling” (CMC Publishing Co., Ltd.) can also be suitably used. The content of the compatibilizer in the resin composition of the present invention is preferably from 0.1 to 30% by mass, more preferably from 0.5 to 20% by mass, based on the total solid content of the resin composition.

The resin composition of the present invention may contain an antioxidant. Examples of the antioxidant include phenol-based antioxidants, amine-based antioxidants, sulfur-based antioxidants, phosphorus-based antioxidants, and the like, and phenol-based antioxidants are preferable. As the phenolic antioxidant, Irganox 1010, Irganox 1076, Irganox 3114, etc. manufactured by Ciba Specialty Chemicals Co., Ltd., or Adekastab PEP-36 manufactured by Asahi Denka Co., Ltd. can be suitably used.
When the resin composition of the present invention contains an antioxidant, its content is not limited, but is preferably 30% by mass or less, more preferably 0.01 to 10%, based on the total solid content of the resin composition. % By mass. By setting it within this range, the resin can obtain a sufficient stability improving effect against heating in the kneading or molding process, which is preferable.

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.
A well-known thing can be used as a filler. 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 silicate, feldspar, potassium titanate, shirasu balloon, calcium carbonate, magnesium carbonate, barium sulfate, calcium oxide Beam, 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 preferably 30% by mass or less, more preferably 5 to 10% by mass with respect to the total solid content of the resin composition.

In addition to those described above, the resin composition of the present invention contains other components for the purpose of further improving various properties such as moldability, impact strength, and flame retardancy, as long as the object of the present invention is not impaired. You may go out.
Examples of other components include polymers other than the cellulose ester, stabilizers (ultraviolet absorbers, etc.), mold release agents (fatty acids, fatty acid metal salts, oxy fatty acids, fatty acid esters, aliphatic partially saponified esters, 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, processing aid, antibacterial agent, Antifungal agents and the like can be mentioned. Further, a coloring agent containing a dye or a pigment can be added.

As the polymer other than the cellulose ester, 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 ester resins include low density polyethylene, linear low density polyethylene, high density polyethylene, polypropylene, ethylene-propylene copolymer, ethylene-propylene-nonconjugated diene copolymer, ethylene- Butene-1 copolymers, polypropylene homopolymers, polypropylene copolymers (such as ethylene-propylene block copolymers), polyolefins such as polybutene-1 and poly-4-methylpentene-1, polybutylene terephthalate, polyethylene terephthalate and other aromatic polyesters Polyester such as nylon 6, nylon 46, nylon 66, nylon 610, nylon 612, nylon 6T, nylon 12, etc., polystyrene, high impact polystyrene, Reacetal (including homopolymers and copolymers), polyurethane, aromatic and aliphatic polyketones, polyphenylene sulfide, polyetheretherketone, thermoplastic starch resin, 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, polyvinyl alcohol, unsaturated polyester, melamine resin, phenol resin, A urea resin, a polyimide, etc. can be mentioned.
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, poly Examples include ether rubber, epichlorohydrin rubber, fluoro rubber, silicone rubber, and other thermoplastic elastomers such as polyurethane, polyester, and polyamide.

Furthermore, those having various degrees of crosslinking, those having various microstructures such as cis structure and trans structure, those having vinyl groups, those having various average particle diameters, core layers and the like A multi-layer structure polymer called a so-called core-shell rubber, which is composed of one or more shell layers to be covered and whose adjacent layers are composed of different types of polymers, can also be used, and further 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 the present invention contains a polymer other than cellulose ester, the content thereof is preferably 30% by mass or less, more preferably 2 to 10% by mass with respect to the total solid content of the resin composition.

The resin composition of the present invention can be used for various purposes. For example, it is good also as a film by melt | dissolving in a solvent and the apply | coating method. Moreover, it is good also as a film by the melt extrusion method.

(II) Molded Body The present invention is a molded body obtained from a resin composition containing a cellulose ester and an aromatic polycarbonate resin,
A sea-island type phase-separated structure whose morphology has a continuous phase of aromatic polycarbonate resin and a dispersed phase of cellulose ester,
The present invention also relates to a molded article having an average minor axis length of the dispersed phase of 1.0 μm or more and an average aspect ratio (major axis / minor axis) of the dispersed phase of 5 or more.
Thus, in the sea-island type phase separation structure having the continuous phase of the aromatic polycarbonate resin and the dispersed phase of the cellulose ester, the average length of the minor axis of the dispersed phase is 1.0 μm or more, and the average of the dispersed phase By setting the aspect ratio to 5 or more, it is possible to obtain a molded article that is extremely excellent in terms of impact strength and flame retardancy.

1. Cellulose ester The molded article of the present invention has a sea-island structure in which the morphology has a continuous phase and a dispersed phase, and the cellulose ester forms the dispersed phase.
The average length of the minor axis of the dispersed phase is 1.0 μm or more, preferably 1.0 to 20 μm, more preferably 1.0 to 10 μm.
The average aspect ratio (major axis / minor axis) of the dispersed phase is 5 or more, preferably 5 to 100, more preferably 10 to 50.
If the average length of the minor axis and the average aspect ratio are in this range, compared to those outside this range, the fracture path when ruptured by impact is long, and the energy required for rupture is increased, resulting in impact resistance. Improves. The shape of the particles of the dispersed phase is not particularly limited as long as it has the average length of the minor axis and the average aspect ratio, and can be any shape such as a scale shape or a column shape.
There is no limitation in particular as the cellulose ester in the molded object of this invention, It is the same as that of the cellulose ester demonstrated with the said resin composition.
The morphology can be observed with an electron microscope, for example.

2. Aromatic polycarbonate-type resin The molded object of this invention is a sea-island structure in which a morphology has a continuous phase and a dispersed phase, and aromatic polycarbonate-type resin comprises this continuous phase. Content of the aromatic polycarbonate-type resin contained in the molded object of this invention is not specifically limited. The mass ratio to the cellulose ester is preferably 0.4 to 1, more preferably 0.5 to 1. By setting it as this range, the polycarbonate resin is likely to be a continuous phase, and the impact strength, flame retardancy, and moldability of the molded product can be further improved. There is no limitation in particular as an aromatic polycarbonate-type resin in the molded object of this invention, It is the same as that of the aromatic polycarbonate-type resin demonstrated with the said resin composition.

3. Manufacturing method The molded object of this invention is obtained by shape | molding the resin composition containing the said cellulose ester and the said aromatic polycarbonate-type resin. More specifically, it is preferable to mold a resin composition having a sea-island type phase separation structure including a continuous phase of an aromatic polycarbonate-based resin and a dispersed phase of cellulose ester, and the above-described resin composition of the present invention is molded. It is more preferable. The molded article of the present invention can be obtained by a production method including a step of heating the resin composition containing various additives as necessary and molding the resin composition by various molding methods.

Examples of the molding method include injection molding, extrusion molding, blow molding, and the like, and it is preferable to perform by injection molding. This is because a dispersed phase in which the average length of the short axis and the average aspect ratio are within the above ranges can be easily obtained by injection molding.
Further, the heating temperature at the time of molding is preferably from 180 to 260 ° C., more preferably from 200 to 250 ° C., because the decomposition of the cellulose ester can be suppressed.

The use of the molded article 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 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 (especially casings) for electrical and electronic equipment such as copiers, printers, personal computers, and televisions. ) Can be suitably used.

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

<Examples 1 to 19 and Comparative Examples 1 to 4>
[Production of molded body]
Cellulose ester, aromatic polycarbonate-based resin, flame retardant and other components were mixed at a blending ratio (mass%) shown in Tables 1 and 2 to prepare a resin composition. This resin composition was supplied to a twin-screw kneading extruder (manufactured by Technobel Co., Ltd., ULTnano) to produce pellets, and the pellets obtained were then injected into an injection molding machine (FANUC Corporation Robot S-2000i, automatic injection molding). Machine), 4 × 10 × 80 mm multi-purpose test pieces were molded.

In Tables 1 and 2, details of each component are as follows.
(A-1) Cellulose acetate propionate (“CAP482-20” manufactured by Eastman Chemical Co., acetyl substitution degree: 0.1, propionyl substitution degree: 2.5, Mn: 73000, Mw: 234000)
(A-2) Cellulose acetate butyrate (“CAB381-20” manufactured by Eastman Chemical Co., Ltd., acetyl substitution degree: 0.6, butyryl substitution degree: 1.3, Mw: 70000)
(B-1) Low viscosity polycarbonate (“Panlite L-1225LL” manufactured by Teijin Chemicals Ltd., Mn: 18000)
(B-2a) Medium viscosity polycarbonate (“Taflon AC1030” manufactured by Idemitsu Kosan Co., Ltd., Mn: 18000)
(B-2b) Medium viscosity polycarbonate (“Panlite L-1225L” manufactured by Teijin Chemicals Ltd., Mn: 21000)
(B-2c) Medium viscosity polycarbonate (“Panlite L-1225Y” manufactured by Teijin Chemicals Ltd., Mn: 25000)
(B-3) High viscosity polycarbonate (“Panlite K-1300Y” manufactured by Teijin Chemicals Ltd., Mn: greater than 26000)
(C-1) Condensed phosphate ester (PX-200, manufactured by Daihachi Chemical Industry Co., Ltd.)
(C-2) Melamine cyanurate (manufactured by Nissan Chemical Industries, Ltd.)
(C-3) Polydimethylsiloxane (“DOW CORNING TORAY SH 200 C FLUID 500 CS” manufactured by Toray Dow Corning Co., Ltd.)
(D) Fluororesin (Mitsui / Dupont Fluoro Chemical Co., Ltd. “PTFE 6J”)
(E-1) Polystyrene (“HRM63X” manufactured by Toyo Styrene Co., Ltd.)
In Tables 1 and 2, PC represents polycarbonate, CAP represents cellulose acetate propionate, and PS represents polystyrene.

[Evaluation]
Using the obtained molded body, the following items were evaluated. The evaluation results are shown in Tables 1 and 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 Then, the impact strength was measured edgewise with a Charpy impact tester (manufactured by Toyo Seiki Seisakusho). The measurement was performed 3 times, and the average value was obtained.
When the average Charpy impact strength is 12 kJ / m ² or more, ◎ 5 kJ / m ² or more and less than 12 kJ / m ² ◯, ² kJ / m ² or more and less than 5 kJ / m ² △ ² kJ / those less than m ² was ×.

(Flame retardance)
As a flame retardant index, a vertical combustion test based on UL94 was performed. The number of tests is five. V-not for non-self-extinguishing, V-2 for resin composition drip during combustion test and self-extinguishing within a predetermined time V-2, no self-extinguishing resin composition drip for self-extinguishing within a predetermined time during combustion V-1 (combustion time within 30 seconds) and V-0 (combustion time within 10 seconds).
V-0 is indicated by ◎, V-1 is indicated by Ｖ, V-2 is indicated by Δ, and V-not is indicated by ×.

(Morphology)
The resin composition and the test piece are observed with an electron microscope, the constituents constituting the continuous phase in the resin composition and the test piece, the average length of the short axis and the average aspect ratio of the short axis of the disperse phase in the test piece (long axis / (Short axis) was measured.
Thirty dispersed phases were randomly selected from an image obtained from an electron microscope, and those having an average length of the minor axis of the dispersed phase of 1.0 μm or more were rated as “○” and those having a minor axis of less than 1.0 μm as “x”. Moreover, the thing whose average aspect-ratio of a short axis is 5 or more was made into (circle) and less than 5 and x. The electron microscope used was an S-5500 SEM manufactured by Hitachi High-Technologies.

From the above results, it was confirmed that the molded body produced from the pellets having a sea-island structure in which the aromatic polycarbonate-based resin is a continuous phase and the cellulose ester is a dispersed phase has good flame retardancy and impact strength. . On the other hand, a molded body produced from a pellet having a sea-island structure in which cellulose ester is a continuous phase and aromatic polycarbonate resin is a dispersed phase is inferior in both flame retardancy and impact strength.
In addition, it has a sea-island structure in which the aromatic polycarbonate resin is a continuous phase and the cellulose ester is a dispersed phase, the average short axis length of the dispersed phase is 1.0 μm or more, and the average aspect ratio (long) of the dispersed phase It was confirmed that the molded product having 5 (axis / minor axis) is good in both flame retardancy and impact strength. On the other hand, a molded product having a sea-island structure in which cellulose ester is a continuous phase and aromatic polycarbonate-based resin is a dispersed phase is inferior in both flame retardancy and impact strength.
In addition, the aromatic polycarbonate-based resin has a sea-island structure in which the cellulose ester is a dispersed phase and the cellulose ester is a dispersed phase, but the average minor axis of the dispersed phase is less than 1.0 μm, or the average aspect ratio of the dispersed phase (major axis) A molded product having a / minor axis of less than 5 was inferior in impact strength.

Although the present invention has been described in detail and with reference to specific embodiments, it will be apparent to those skilled in the art that various changes and modifications can be made without departing from the spirit and scope of the invention.
This application is based on a Japanese patent application filed on March 30, 2010 (Japanese Patent Application No. 2010-079929), the contents of which are incorporated herein by reference.

Claims

A resin composition comprising a cellulose ester and an aromatic polycarbonate resin,
The weight ratio of the aromatic polycarbonate resin to the cellulose ester is 0.4 to 1,
The aromatic polycarbonate resin has a number average molecular weight of 10,000 to 26000,
A resin composition having a sea-island type phase-separated structure in which the morphology includes a continuous phase of an aromatic polycarbonate resin and a dispersed phase of a cellulose ester.
The resin composition according to claim 1, wherein the cellulose ester is at least one cellulose ester selected from the group consisting of cellulose acetate, cellulose acetate propionate, and cellulose acetate butyrate.
The resin composition according to claim 1 or 2, further comprising at least one flame retardant selected from the group consisting of a phosphorus flame retardant, a nitrogen compound flame retardant, and a silicone flame retardant.
4. The resin composition according to claim 3, wherein the phosphorus flame retardant is a phosphate ester.
The resin composition according to any one of claims 1 to 4, further comprising a fluorine-based resin.
A molded body obtained from a resin composition containing a cellulose ester and an aromatic polycarbonate resin,
A sea-island type phase-separated structure whose morphology has a continuous phase of aromatic polycarbonate resin and a dispersed phase of cellulose ester,
A molded product having an average length of the minor axis of the dispersed phase of 1.0 μm or more and an average aspect ratio (major axis / minor axis) of the dispersed phase of 5 or more.
A molded product obtained by molding the resin composition according to any one of claims 1 to 5.
A housing for electrical and electronic equipment comprising the molded article according to claim 6 or 7.