JP2011006605A - Resin composition, molded article and method for producing resin composition - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a resin composition having high fluidity, to provide a method for producing the resin composition, and to provide a molded article obtained by molding the resin composition.SOLUTION: The resin composition contains at least (A) a polylactic acid, (B) a phosphoric acid salt, and (C) a phosphorus-containing compound having the melting point of ≤200°C. Preferably, the phosphorus-containing compound (C) having the melting point of ≤200°C is at least one kind selected from a condensed phosphoric acid ester-based compound and a phosphazene compound in the described resin composition. In another embodiment, the phosphoric acid salt (B) is an ammonium polyphosphate in the described resin composition. The method for producing the resin composition includes kneading at least the polylactic acid (A), the phosphoric acid salt (B) and the phosphorus-containing compound (C) having the melting point of ≤200°C, at a temperature not lower than the melting point of the phosphorus-containing compound (C) having the melting point of ≤200°C. The molded article is obtained by molding the resin composition.

Description

  The present invention relates to a resin composition, a molded body, and a method for producing a resin composition.

  Conventionally, studies have been made to use polylactic acid-based resin materials for parts of electrical products and electronic / electrical equipment.

Specifically, a resin composition comprising polylactic acid, a specific thermoplastic resin, and a graft copolymer is known (see, for example, Patent Document 1).
Further, it is composed of a mixture of a resin containing polylactic acid as a main component, glass fiber as a filler, and a phosphoric acid flame retardant as an additive, and the resin includes polybutylene terephthalate in addition to polylactic acid as the main component. There is known a resin composition containing only (see, for example, Patent Document 2).
And a polylactic acid resin and at least two flame retardants selected from brominated flame retardants, chlorine flame retardants, phosphorus flame retardants, nitrogen compound flame retardants, silicone flame retardants and other inorganic flame retardants; , Containing a resin composition is known (for example, see Patent Document 3).

JP 2005-320409 A Japanese Patent No. 3971289 JP 2004-190025 A

  An object of this invention is to provide the resin composition which has high fluidity | liquidity compared with the case where it does not contain the phosphorus containing compound whose (C) melting | fusing point is 200 degrees C or less.

The above problem is solved by the following means. That is,
The invention according to claim 1
A resin composition comprising at least (A) polylactic acid, (B) a phosphate, and (C) a phosphorus-containing compound having a melting point of 200 ° C. or lower.

The invention according to claim 2
2. The resin composition according to claim 1, wherein the phosphorus-containing compound (C) having a melting point of 200 ° C. or lower is at least one selected from a condensed phosphate ester compound and a phosphazene compound.

The invention according to claim 3
The resin composition according to claim 1, wherein the (B) phosphate is ammonium polyphosphate.

The invention according to claim 4
At least (A) polylactic acid, (B) phosphate, and (C) a phosphorus-containing compound having a melting point of 200 ° C. or lower, and (C) a temperature equal to or higher than the melting point of the phosphorus-containing compound having a melting point of 200 ° C. or lower. It is a manufacturing method of the resin composition knead | mixed by.

The invention according to claim 5
The molded object obtained by shape | molding the resin composition of any one of Claims 1-3.

  According to the invention which concerns on Claim 1, compared with the case where it does not contain the phosphorus containing compound whose (C) melting | fusing point is 200 degrees C or less, high fluidity | liquidity is obtained.

  According to the invention which concerns on Claim 2, compared with the case where (C) the phosphorus containing compound whose melting | fusing point is 200 degrees C or less is not a condensed phosphate ester type compound and a phosphazene compound, high fluidity | liquidity is obtained.

  According to the invention which concerns on Claim 3, compared with the case where (B) phosphate is not ammonium polyphosphate, high flame retardance is acquired.

  According to the invention which concerns on Claim 4, compared with the case where kneading | mixing is performed at the temperature below this melting | fusing point of the phosphorus containing compound whose (C) melting | fusing point is 200 degrees C or less, the resin composition which has high flame retardance is manufactured easily. Is done.

  According to the invention which concerns on Claim 5, compared with the case where it does not have this structure, the molded object with a high shaping | molding precision is provided.

It is a schematic diagram which shows an example of the components of an electronic / electric equipment provided with the molded object of this embodiment.

  Embodiments that are examples of the present invention will be described below.

≪Resin composition≫
The resin composition according to the present embodiment includes at least (A) polylactic acid, (B) a phosphate, and (C) a phosphorus-containing compound having a melting point of 200 ° C. or lower.

  In the resin composition containing polylactic acid as a main raw material, the reason why high fluidity is realized is not clear, but is presumed as follows. Conventionally, in resin compositions in which polylactic acid is the main raw material and phosphate is added, phosphate is decomposed near the molding temperature of polylactic acid at the time of producing a molded article, and the decomposition of polylactic acid is promoted. The molding was not stable. On the other hand, in the present embodiment, (C) the plasticity of the phosphorus-containing compound having a melting point of 200 ° C. or lower can be molded at a low temperature, and as a result, decomposition of polylactic acid is suppressed and high fluidity is obtained. It is guessed.

Hereinafter, each component contained in the resin composition according to the present embodiment will be described.
<(A) Polylactic acid>
Polylactic acid is derived from plants and has an effect of reducing environmental burden, specifically, reducing CO ₂ emissions and oil consumption.
The polylactic acid is not particularly limited as long as it is a condensate of lactic acid, and may be L lactic acid, D lactic acid, or a mixture of them by copolymerization or blending.
As the polylactic acid, a synthesized product or a commercially available product may be used. Examples of the commercially available products include Terramac TE4000, TE7000, TE8000 manufactured by Unitika Ltd., and Lacia H100 manufactured by Mitsui Chemicals, Inc.
Polylactic acid may be used individually by 1 type, and may use 2 or more types together.

  The polylactic acid may be a copolymer of a lactic acid monomer and another monomer. Examples of the other monomer that can be copolymerized include, as dicarboxylic acids, malonic acid, succinic acid, glutaric acid, adipic acid, pimelic acid, azelaic acid, sebacic acid, fumaric acid, 2,2-dimethylglutaric acid, and suberin. Acids, 1,3-cyclopentanedicarboxylic acid, 1,4-dicyclohexane-dicarboxylic acid, 1,3-cyclohexanedicarboxylic acid, diglycolic acid, itaconic acid, maleic acid, 2,5-norbornane dicarboxylic acid, and these Examples include ester-forming derivatives. Examples of diols include ethylene glycol, diethylene glycol, propylene glycol, 1,3-propanediol, 2,2-dimethyl-1,3-propanediol, 1,3-butanediol, 1,4-butanediol, 1, 5-pentanediol, 1,6-hexanediol, 2,2-trimethyl-1,6-hexanediol, thiodiethanol, 1,3-cyclohexanedimethanol, 1,4-cyclohexanedimethanol, 2,2,4, Examples include 4-tetramethyl-1,3-cyclobutanediol, triethylene glycol, tetraethylene glycol, di-, tri-, and tetra-propylene glycol. Said other monomer may be used individually by 1 type, and may use 2 or more types together.

  The molecular weight of polylactic acid is not particularly limited, but the weight average molecular weight is preferably 30,000 or more and 200,000 or less, and more preferably 50,000 or more and 150,000 or less.

  The content of polylactic acid (total content when two or more are used in combination) is not particularly limited, but is preferably 20% by mass or more and 90% by mass or less, and 30% by mass with respect to the total amount of the resin composition. It is more desirable that the content is not less than 80% and not more than 80% by mass.

<(B) Phosphate>
There is no restriction | limiting in particular as a phosphate, Both organic phosphate and inorganic phosphate are mentioned.
Examples of the organic phosphate include ammonium phosphate, melamine phosphate, and guanidine phosphate. Examples of the inorganic phosphate include aluminum phosphate, magnesium phosphate, and manganese phosphate. Among these, organic phosphates, particularly ammonium polyphosphate is preferable.
A phosphate may be used individually by 1 type, and may use 2 or more types together.

The phosphate preferably has a 1% decomposition temperature of 200 ° C. or higher, more preferably 210 ° C. or higher and 400 ° C. or lower, and further preferably 250 ° C. or higher and 350 ° C. or lower.
In addition, the measurement of the said decomposition temperature is performed by the following method, and the numerical value described in this specification was performed by this method. The dried phosphate is subjected to thermogravimetric analysis (TG) measurement, heated from an initial temperature (15 ° C. to 35 ° C.) to 600 ° C. or more, and 1% by mass relative to the phosphate mass at the initial temperature. The temperature at which a decrease is observed is determined as the 1% decomposition temperature.

  The phosphate preferably has a phosphorus (P) content of 15% by mass or more and 40% by mass or less, and more preferably 20% by mass or more and 35% by mass or less.

  The phosphate content (total content when two or more are used in combination) is not particularly limited, but is preferably 10% by mass or more and 50% by mass or less based on the total amount of the resin composition. It is more desirable that the content is not less than 40% by mass.

<(C) Phosphorus-containing compound>
The phosphorus-containing compound used in the present embodiment is required to have a melting point of 200 ° C. or lower and contain phosphorus.
The melting point of the phosphorus-containing compound is preferably 190 ° C. or lower.

  In addition, the measurement of melting | fusing point was performed by the following method, and the numerical value as described in this specification was performed by this method. Using a differential scanning calorimeter (Seiko Denshi Kogyo Co., Ltd .: DSC-20), it is determined by measuring from room temperature (25 ° C.) to 150 ° C. under a temperature rising rate of 10 ° C./min.

The phosphorus-containing compound is not particularly limited, and examples thereof include condensed phosphate ester compounds, phosphazene compounds, phosphate ester compounds, and phosphite ester compounds. Among these, condensed phosphate ester compounds or phosphazene compounds are particularly preferably used.
Specific examples of the condensed phosphate ester compound include PX200, PX202, CR741 (manufactured by Daihachi Chemical Co., Ltd.), SP-703, SP-670 (manufactured by Shikoku Kasei Co., Ltd.), and the like. Specific examples of the phosphazene compound include FP-110, 200 (above, manufactured by Fushimi Pharmaceutical Co., Ltd.), SPS-100, SPH-100 (above, manufactured by Otsuka Chemical Co., Ltd.) and the like.
A phosphorus containing compound may be used individually by 1 type, and may use 2 or more types together.

  The content of the phosphorus-containing compound (total content when two or more are used in combination) is not particularly limited, but is preferably 5% by mass or more and 40% by mass or less with respect to the total amount of the resin composition. It is more desirable that the content be not less than 20% by mass and not more than 20% by mass.

  The mixing ratio of (B) phosphate and (C) phosphorus-containing compound (amount of (B): amount of (C)) is desirably 50:50 to 95: 5 in terms of mass ratio, More preferably, it is 60:40 to 90:10.

<Other ingredients>
-Fiber The resin composition according to the present embodiment may further contain a fiber.
Although there is no restriction | limiting in particular as a fiber, A glass fiber is used suitably, Furthermore, as for this glass fiber, what the surface is surface-treated with an epoxy-type processing agent is more desirable.

As an epoxy-type processing agent which surface-treats glass fiber, a bisphenol type | mold epoxy processing agent, a phenol type epoxy processing agent, a siloxane modified epoxy processing agent etc. are mentioned, for example.
For example, the treatment amount with the epoxy treating agent is preferably 0.01% or more and 5% or less, and more preferably 0.1% or more and 3% or less.

The diameter of the glass fiber is desirably 6 μm or more and 15 μm or less, and more desirably 8 μm or more and 10 μm or less.
The fiber length of the glass fiber is preferably from 1 mm to 4 mm, and more preferably from 2 mm to 3 mm.

  The glass fiber content (total content when two or more types are used in combination) is not particularly limited, but is preferably 3% by mass or more and 20% by mass or less with respect to the total amount of the resin composition. % To 15% by mass is more desirable, and 5% to 10% by mass is particularly desirable.

-Polyfunctional compound The resin composition which concerns on this embodiment may contain the polyfunctional compound which can react with the terminal group of polylactic acid further. The polyfunctional compound is a compound having two or more functional groups that react with terminal groups (for example, carboxyl group, hydroxyl group, etc.) of polylactic acid.

Examples of the polyfunctional compound having a functional group that reacts with the terminal group of polylactic acid include a carbodiimide compound, a dicarboxylic acid compound, a diol compound, a hydroxycarboxylic acid compound, and an epoxy compound.
Examples of the carbodiimide compound include aliphatic monocarbodiimide, aliphatic dicarbodiimide, aromatic monocarbodiimide, aromatic dicarbodiimide, and the like.
Examples of the dicarboxylic acid compound include succinic acid, adipic acid, sebacic acid, and the like.
Examples of the diol compound include ethylene glycol, propylene glycol, bisphenol A, and the like.
Examples of the hydroxycarboxylic acid compound include lactic acid, 3-hydroxybutyric acid, 6-hydroxyhexanoic acid and the like.
Examples of the epoxy compound include bisphenol type epoxy and novolac type epoxy.
Among these, as the polyfunctional compound, a bifunctional compound (polyfunctional compound having two functional groups), particularly a bifunctional carbodiimide compound is desirable.
A polyfunctional compound may be used individually by 1 type, and may use 2 or more types together.

  The content of the polyfunctional compound (total content when two or more are used in combination) is not particularly limited, but is preferably 0.1% by mass or more and 3% by mass or less with respect to the total amount of the resin composition. The content is more preferably 0.5% by mass or more and 2% by mass or less, and particularly preferably 1% by mass or more and 1.5% by mass or less.

-Siloxane compound The resin composition according to this embodiment may contain a compound having a siloxane structure (siloxane compound).
The compound having a siloxane structure is not particularly limited as long as it is a compound having a siloxane structure (Si-0) in the molecular structure, and examples thereof include polydimethylsiloxane, dihydroxypolysiloxane, and octamethylcyclotetrasiloxane. .

  The content of the compound having a siloxane structure is not particularly limited, but from the viewpoint of heat resistance and flame retardancy, it may be from 0.5% by mass to 10% by mass with respect to the total amount of the resin composition. Desirably, it is more desirable that it is 1 mass% or more and 7 mass% or less.

Other fillers The resin composition according to the present embodiment may contain other fillers.
Examples of other fillers include clay, talc, mica, and montmorillonite. Other fillers include melamine-containing particles, phosphate particles, titanium oxide and the like.
Other fillers may be used alone or in combination of two or more.

  The particle diameter of the filler is preferably 0.01 μm or more and 5 μm or less, and more preferably 0.05 μm or more and 2 μm or less in terms of the number average particle diameter.

As the other filler, a synthesized product or a commercially available product may be used. Moreover, you may use a natural thing.
As a commercial product of clay, Nanoclay MX manufactured by Nanocore Corporation and the like can be mentioned.
As a commercially available product of talc, there is Microace P8 manufactured by Nippon Talc.
Examples of commercially available mica include mica powder manufactured by Nippon Mica Seisakusho, Yamaguchi Mica Industry SJ-005, SYA21-RS, and the like.
As a commercial item of montmorillonite, Kunimine F Co., Ltd. Kunipia F etc. are mentioned.
For example, as the other fillers, those previously blended with a commercially available polylactic acid may be applied.

  The content of other fillers is not particularly limited, but from the viewpoint of heat resistance and flame retardancy, it is preferably 1% by mass or more and 50% by mass or less with respect to the total amount of the resin composition. It is more desirable that the content is not less than 20% and not more than 20% by mass.

-Other flame retardant Moreover, the flame retardant may be contained in the resin composition which concerns on this embodiment.
Other flame retardants include silicone flame retardants, nitrogen flame retardants, inorganic hydroxide flame retardants, and the like.
Other flame retardants may be used alone or in combination of two or more.

As other flame retardants, synthesized products or commercially available products may be used.
Examples of commercially available phosphorus-based flame retardants include PX-200 and PX-202 manufactured by Daihachi Chemical, TERRAJU C80 manufactured by Bütenheim, EXOLIT AP422 and EXOLIT OP930 manufactured by Clariant, and the like.
Examples of commercially available silicone flame retardants include Toray Dow Silicone DC4-7081.
Examples of commercially available nitrogen-based flame retardants include Apinon 901 manufactured by Sanwa Chemical, Melamine pyrophosphate manufactured by Shimonoseki Mitsui Chemicals, FP2100 and FP2200 manufactured by ADEKA, and the like.
Examples of commercially available inorganic hydroxide flame retardants include MGZ300 manufactured by Sakai Chemical Industry, B103ST manufactured by Nippon Light Metal.

  The content of the other flame retardant is not particularly limited, but is preferably 2% by mass or more and 20% by mass or less with respect to the total amount of the resin composition from the viewpoint of flame retardancy and impact strength. It is more desirable that the content is not less than 15% and not more than 15% by mass.

  Moreover, the resin composition of this embodiment may contain a mold release agent, a weather resistance agent, a light resistance agent, a coloring agent, etc.

<Method for producing resin composition>
The resin composition according to the present embodiment is produced by kneading the above components (A) to (C) and other components as necessary.
The kneading is performed using, for example, a known kneading apparatus such as a biaxial kneading apparatus (Toshiba Machine, TEM58SS), a simple kneader (Toyo Seiki, Labo Plast Mill).
Here, as the kneading temperature condition (cylinder temperature condition), from the viewpoint of improving the flame retardancy of the resin composition obtained by reliably dissolving the phosphorus-containing compound, (C) the melting point of the phosphorus-containing compound or higher. It is desirable to be carried out at a temperature of Moreover, it is desirable that the temperature be equal to or higher than the melting point of (B) phosphate. Specifically, it is preferably 150 ° C. or higher and 190 ° C. or lower, and more preferably 160 ° C. or higher and 180 ° C. or lower.

≪Molded body≫
The molded body of the present embodiment can be obtained by molding the above-described resin composition of the present embodiment. For example, the molded body according to the present embodiment is obtained by molding by a molding method such as injection molding, extrusion molding, blow molding, or hot press molding. In this embodiment, it is desirable that the resin composition of this embodiment is obtained by injection molding.
The injection molding is performed using, for example, a commercially available apparatus such as NEX150 manufactured by Nissei Plastic Industry, NEX70000 manufactured by Nissei Plastic Industry, SE50D manufactured by Toshiba Machine.
At this time, the cylinder temperature is preferably 160 ° C. or higher and 240 ° C. or lower, and more preferably 170 ° C. or higher and 210 ° C. or lower.
The mold temperature is preferably 30 ° C. or higher and 120 ° C. or lower, and more preferably 30 ° C. or higher and 60 ° C. or lower.

In addition, the crystallinity of (A) polylactic acid in the molded body of this embodiment is desirably 20% or more.
Here, the crystallinity indicates a value measured by a density gradient tube method. Specifically, standard test pieces having a crystallinity of 100% and 0% are suspended in a density gradient tube made of a mixed system of two kinds of alcohols. The density is determined from the floating position of these two types of standard test pieces, and a calibration curve of density and crystallinity is created. Next, the sample specimen (with the same volume as the standard specimen) whose crystallinity is to be measured is suspended in this density gradient tube, the density is obtained from the floating position, and the crystallinity is obtained from the calibration curve. Points to the value.

  The molded body of the above-described embodiment is suitably used for applications such as electronic / electrical equipment, home appliances, containers, and automobile interior materials. More specifically, housings such as home appliances and electronic / electrical equipment, various parts, wrapping films, storage cases such as CD-ROMs and DVDs, tableware, food trays, beverage bottles, chemical wrap materials, etc. Especially, it is suitable for parts of electronic / electric equipment. Many parts of electronic / electrical devices have complicated shapes, but the resin molded body of the present embodiment provides those that sufficiently satisfy the required characteristics.

FIG. 1 is a schematic diagram illustrating an example of a component of an electronic / electric device including the molded body of the present embodiment. This figure is an external perspective view of an image forming apparatus, which is an example of a component of an electronic / electric apparatus provided with the molded body of this embodiment, as viewed from the front side.
The image forming apparatus 100 in FIG. 1 includes front covers 120 a and 120 b on the front surface of the main body device 110. These front covers 120a and 120b can be freely opened and closed so that an operator can operate the inside of the apparatus. Thus, the operator replenishes the toner when the toner is exhausted, replaces the exhausted process cartridge, or removes the jammed paper when a paper jam occurs in the apparatus. FIG. 1 shows the apparatus with the front covers 120a and 120b opened.

  On the upper surface of the main unit 110, an operation panel 130 on which various conditions relating to image formation such as a paper size and the number of copies are input by an operation of an operator, and a copy glass 132 on which a document to be read is arranged are provided. Yes. In addition, the main body device 110 includes an automatic document conveying device 134 that conveys a document on the copy glass 132 at the top thereof. Further, main device 110 includes an image reading device that scans a document image placed on copy glass 132 and obtains image data representing the document image. Image data obtained by the image reading apparatus is sent to the image forming unit via the control unit. Note that the image reading device and the control unit are housed in a housing 150 that forms part of the main body device 110. The image forming unit is provided in the housing 150 as a detachable process cartridge 142. The process cartridge 142 is attached and detached by turning the operation lever 144.

  A toner container 146 is attached to the casing 150 of the main body device 110, and toner is replenished from the toner supply port 148. The toner stored in the toner storage unit 146 is supplied to the developing device.

  On the other hand, sheet storage cassettes 140a, 140b, and 140c are provided at the lower portion of the main unit 110. In addition, the main body apparatus 110 has a plurality of conveying rollers formed of a pair of rollers arranged in the apparatus, thereby forming a conveying path through which the sheets of the sheet storage cassette are conveyed to the upper image forming unit. ing. The paper in each paper storage cassette is taken out one by one by a paper take-out mechanism arranged at the end of the transport path and sent out to the transport path. Further, a manual paper supply unit 136 is provided on a side surface of the main apparatus 110, and paper is supplied from here.

  The paper on which the image is formed by the image forming unit is sequentially transferred to an area sandwiched between two fixing rolls that are in contact with each other and supported by a casing 152 constituting a part of the main body apparatus 110, and then the main body apparatus. The sheet is discharged outside 110. The main body device 110 is provided with a plurality of paper discharge sections 138 on the side opposite to the side where the paper supply section 136 is provided, and the paper after image formation is discharged to these paper discharge sections.

  In the image forming apparatus 100, for example, the molded body according to the present embodiment is suitably used as a member for office equipment such as the front covers 120a and 120b, the exterior of the process cartridge 142, the casing 150, and the casing 152. is there.

  EXAMPLES The present invention will be specifically described below with reference to examples, but the present invention is not limited to these examples.

[Example 1 to Example 11, Comparative Example 1 to Comparative Example 2]
<Preparation of resin composition>
The raw materials having the compositions and compositions shown in Table 1 were put into a biaxial kneader (TEM58SS, manufactured by Toshiba Machine Co., Ltd.) and kneaded at a cylinder temperature of 180 ° C. to obtain a resin composition (compound).

<Preparation of molded body (test piece)>
Next, injection molding is performed using the obtained resin composition at an injection molding apparatus (NEX150E, manufactured by Nissei Plastic Co., Ltd.) at a molding temperature (cylinder temperature) shown in Table 1 below and a mold temperature of 120 ° C. , ISO multi-purpose test piece (corresponding to ISO 527 tensile test and ISO 178 bending test, test part thickness 4 mm, width 10 mm), and UL test piece for V test in UL 94 (thickness 1.6 mm) were obtained.

In addition, each material in the said Table 1 is as follows.
(Polylactic acid)
A1: Terramac TE7000 / Unitika Ltd. (weight average molecular weight 100,000)
A2: Terramac TE4000 / Unitika Ltd. (weight average molecular weight 60,000)
(Phosphate)
B1: Terrage C80 / Budenheim (ammonium polyphosphate)
B2: Clariant AP422 / manufactured by Clariant (ammonium polyphosphate)
B3: Terrage C60 / Budenheim (ammonium polyphosphate)
B4: Clariant AP462 / manufactured by Clariant (ammonium polyphosphate)
B5: MPP-B / Sanwa Chemical Co., Ltd. (melamine polyphosphate)
(Phosphorus-containing compound)
C1: PX200 / manufactured by Daihachi Chemical Co. (condensed phosphate ester compound, melting point 95 ° C.)
C2: SP-703 / Shikoku Kasei Co., Ltd. (Condensed phosphate ester compound, melting point 180 ° C.)
C3: Ravitor FP-110 / Fushimi Pharmaceutical Co., Ltd. (phosphazene compound, melting point 110 ° C.)
C4: Adeka Stub PEP-4C / Asahi Denka Co., Ltd. (phosphite compound, melting point 235 ° C.)
(Fiber): GF / Owens Corning (Polyfunctional compound): Carbodiimide (LA1) / Nisshinbo (siloxane compound): SX005 / Mitsubishi Rayon (Anti-drip agent): PTFE / Daikin Industries

<Measurement / Evaluation>
The following measurements and evaluations were performed using the obtained test pieces. Table 2 shows the results.

(Liquidity)
The resin compositions (compounds) obtained in the above Examples and Comparative Examples were injected with an injection molding apparatus (NEX150E, manufactured by Nissei Resin Co., Ltd.) using a mold having a bar flow cavity having a width of 10 mm and a thickness of 2 mm. The injection molding was performed at the molding temperature (cylinder temperature) shown in Table 1 below, the mold temperature of 120 ° C., and the injection pressure of 100 MPa, and the following criteria were evaluated.
○: Length is 250 mm or more Δ: Length is 100 mm or more and less than 250 mm ×: Length is less than 100 mm

(UL-V test)
Using a UL test piece (thickness 1.6 mm) for V test in UL-94, a UL-V test was performed by the method of UL-94. The criteria for the UL-V test are as follows.
V-0: The highest flame retardancy V-1: The flame retardance is the second highest after V-0 V-2: The flame retardance is the second highest after V-1 V-not: The flame retardancy is higher than V-2 Inferior to

(Measure Charpy impact strength)
An ISO multi-purpose dumbbell specimen (supporting ISO 527 tensile test and ISO 178 bending test, test part thickness 4 mm, width 10 mm) is processed, and Charpy impact resistance is measured with an impact resistance test device (Toyo Seiki, DG-5) according to ISO 179 The strength was measured.
The Charpy impact strength indicates that the larger the value, the better the impact resistance.

DESCRIPTION OF SYMBOLS 100 Image forming apparatus 110 Main body apparatus 120a, 120b Front cover 136 Paper supply part 138 Paper discharge part 142 Process cartridge 150, 152 Case

Claims (5)

  A resin composition comprising at least (A) polylactic acid, (B) a phosphate, and (C) a phosphorus-containing compound having a melting point of 200 ° C. or lower.   The resin composition according to claim 1, wherein the phosphorus-containing compound (C) having a melting point of 200 ° C or lower is at least one selected from a condensed phosphate ester compound and a phosphazene compound.   The resin composition according to claim 1, wherein the (B) phosphate is ammonium polyphosphate.   At least (A) polylactic acid, (B) phosphate, and (C) a phosphorus-containing compound having a melting point of 200 ° C. or lower, and (C) a temperature equal to or higher than the melting point of the phosphorus-containing compound having a melting point of 200 ° C. or lower. The manufacturing method of the resin composition knead | mixed with.   The molded object obtained by shape | molding the resin composition of any one of Claims 1-3.