JP5204472B2 - Resin composition, resin molded body and method for producing the same - Google Patents

Description

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

  In recent years, biodegradable resins such as aliphatic polyesters have attracted attention as biomass materials from the viewpoint of environmental protection.

As a resin molded body using a biodegradable resin, one containing a flame retardant for the purpose of improving flame retardancy is known. Such flame retardants include various types such as phosphorus flame retardants, bromine flame retardants, chlorine flame retardants, nitrogen compound flame retardants, and silicone flame retardants. Furthermore, examples of the phosphorus flame retardant include ammonium phosphate, ammonium polyphosphate, melamine phosphate, red phosphorus, phosphate ester, condensed phosphate ester, halogen-containing condensed organic phosphate ester, and melamine phosphate. (For example, refer to Patent Documents 1 to 3 below.)
JP 2004-027079 A JP 2003-192929 A JP 2004-190025 A

  The present invention provides a resin composition, a resin molded article, and a method for producing the same that can achieve both high mechanical strength and flame retardancy even when a phosphorus-based flame retardant is contained. With the goal.

The invention according to claim 1 comprises an aliphatic polyester, a second polymer compound other than the aliphatic polyester, and an organic phosphate compound having a phosphorus content of 27 % by mass or more, and the fat Group polyester is contained in an amount of 20% by mass to 80% by mass with respect to the total amount of the resin composition, and the second polymer compound is polycarbonate, polyarylate, aromatic polyester, polyamide, polyimide, polymethyl methacrylate, polystyrene. , Polyoxymethylene, polyphenylene oxide, acrylonitrile-butadiene-styrene resin, polyacetal, polybutylene terephthalate, and polyether ketone, and is 5% by mass or more and 70% by mass with respect to the total amount of the resin composition % Or less, and the organophosphate compound is A Li Lin ammonium, in the resin composition, characterized in that contained in 3 mass% to 25 mass% of the resin composition the total amount.

The invention according to claim 2 is the resin composition according to claim 1, wherein the weight average molecular weight of the organophosphate compound is 80,000 to 150,000.

Invention of Claim 3 exists in the resin composition of Claim 1 or Claim 2 , wherein the number of repeating units of ammonium polyphosphate is 800 or more.

The invention according to claim 4 is the resin composition according to any one of claims 1 to 3 , further comprising an elastomer.

The invention according to claim 5 is the resin composition according to claim 4 , wherein the elastomer has a core-shell structure of a core made of butadiene and a shell made of acrylic.

The invention according to claim 6 is the resin composition according to any one of claims 1 to 5 , wherein the aliphatic polyester is polylactic acid.

The invention according to claim 7 is the invention according to any one of claims 1 to 7 , wherein the second polymer compound is at least one selected from polycarbonate and acrylonitrile-butadiene-styrene resin. It exists in the resin composition of description.

The invention according to claim 8 is the resin composition according to any one of claims 1 to 7 , further comprising a compound represented by the following general formula (I).

In general formula (I), Ar ¹ represents a substituted or unsubstituted arylene group, a substituted or unsubstituted biphenylene group, or a substituted or unsubstituted bisphenol-type arylene group, and Ar ² and Ar ³ are each independently Represents a substituted or unsubstituted aryl group, and R ¹ and R ² each independently represents a substituted or unsubstituted alkyl group having 1 to 10 carbon atoms, or a substituted or unsubstituted aryl group.

Invention of Claim 9 exists in the resin molding characterized by including the resin composition of any one of Claims 1-8 .

The invention according to claim 10, claim 9, and satisfies the condition that the molecular weight distribution of the aliphatic polyester and the second polymer compound in the molded resin is represented by the following formula (1) It is in the resin molding.
Mw (1) / Mn (1) ≧ Mw (2) / Mn (2) (1)
In formula (1), Mw (1) and Mn (1) represent the weight average molecular weight and number average molecular weight of the aliphatic polyester, respectively, and Mw (2) and Mn (2) represent the second polymer compound, respectively. The weight average molecular weight and the number average molecular weight are shown.

Invention of Claim 11 contains aliphatic polyester, 2nd high molecular compound other than this aliphatic polyester, and the organic phosphoric acid compound whose phosphorus content is 27 mass% or more , The said fat Group polyester is contained in an amount of 20% by mass to 80% by mass with respect to the total amount of the resin composition, and the second polymer compound is polycarbonate, polyarylate, aromatic polyester, polyamide, polyimide, polymethyl methacrylate, polystyrene. , Polyoxymethylene, polyphenylene oxide, acrylonitrile-butadiene-styrene resin, polyacetal, polybutylene terephthalate, and polyether ketone, and is 5% by mass or more and 70% by mass with respect to the total amount of the resin composition % Or less, and the organophosphate compound is A ammonium polyphosphate, first the resin composition that will be contained in 25 mass% or less 3 wt% or more based on the resin composition the total amount, and kneaded under conditions where the temperature of the resin composition is 220 ° C. or less And a second step of forming the kneaded body obtained in the first step to obtain a resin molded body.

The invention according to claim 12 is the resin molded body in which the second step satisfies the condition that the molecular weight distribution of the aliphatic polyester and the second polymer compound in the resin molded body is represented by the following formula (1). It is a process to obtain, It exists in the manufacturing method of the resin molding of Claim 12.
Mw (1) / Mn (1) ≧ Mw (2) / Mn (2) (1)
In formula (1), Mw (1) and Mn (1) represent the weight average molecular weight and number average molecular weight of the aliphatic polyester, respectively, and Mw (2) and Mn (2) represent the second polymer compound, respectively. The weight average molecular weight and the number average molecular weight are shown.

The invention according to claim 13 is the process according to claim 11 or 12 , wherein the second step is a step of injection molding under a condition that the temperature of the kneaded body in the injection molding machine is 220 ° C. or less. It exists in the manufacturing method of a resin molding.

  The invention according to claim 1 has both a high level of mechanical strength and flame retardancy as compared with a resin composition that does not have this configuration even when it contains a phosphorus-based flame retardant. Has the effect of becoming possible. In particular, the fact that the mechanical strength can be achieved at a high level by the invention according to claim 1 is not necessarily suitable for an application where mechanical strength is required because the phosphorus-based flame retardant can cause hydrolysis of the aliphatic polyester resin. Considering what is considered not, it can be said to be a very unexpected effect.

  The invention according to claim 2 is that even when a phosphorus-based flame retardant is contained, mechanical strength and flame retardancy can be achieved at a high level as compared with a resin composition not having this configuration. The invention according to claim 1 can be effectively realized, and in particular, the impact resistance can be further improved while the flame retardancy is sufficient.

Invention of Claim 3 says that even if it contains a phosphorus-based flame retardant, both mechanical strength and flame retardancy can be achieved at a high level as compared with a resin composition not having this configuration. The invention according to claim 1 can be effectively realized, and in particular, the impact resistance can be further improved while the flame retardancy is sufficient.

The invention according to claim 4 is that even when a phosphorus-based flame retardant is contained, both mechanical strength and flame retardancy can be achieved at a high level as compared with a resin composition not having this configuration. The invention according to claim 1 can be effectively realized.

The invention according to claim 5 is that even if it contains a phosphorus-based flame retardant, mechanical strength and flame retardancy can be achieved at a high level as compared with a resin composition not having this configuration. The invention according to claim 1 can be effectively realized, and in particular, the impact strength can be further improved.

The invention according to claim 6 has mechanical strength and difficulty compared with a resin composition that does not have this configuration while maintaining a high plant degree even when a phosphorus-based flame retardant is contained. It has the effect that the invention according to claim 1 that can achieve both high flammability and the flame resistance can be effectively realized.

According to the seventh aspect of the present invention, even when a phosphorus-based flame retardant is contained, mechanical strength and flame retardancy can be achieved at a high level as compared with a resin composition not having this configuration. The invention according to claim 1 can be effectively realized, and in particular, the impact strength can be further improved.

The invention according to claim 8 is that even when a phosphorus-based flame retardant is contained, both mechanical strength and flame retardancy can be achieved at a high level as compared with a resin composition not having this configuration. The invention according to claim 1 can be effectively realized, and in particular, the solvent resistance can be further improved.

The invention according to claim 9 has both a high level of mechanical strength and flame retardancy as compared with a resin molded body that does not have this configuration even when it contains a phosphorus-based flame retardant. Has the effect of becoming possible. In particular, the fact that the mechanical strength can be achieved at a high level by the invention described in claim 9 is not necessarily suitable for applications where mechanical strength is required because the phosphorus-based flame retardant can cause hydrolysis of the aliphatic polyester resin. Considering what is considered not, it can be said to be a very unexpected effect.

The invention according to claim 10 has both a high level of mechanical strength and flame retardancy as compared with a resin molded body that does not have this configuration even when it contains a phosphorus-based flame retardant. Has the effect of becoming possible. In particular, the fact that the mechanical strength can be achieved at a high level by the invention of claim 10 is not necessarily suitable for applications requiring mechanical strength because ammonium polyphosphate can cause hydrolysis of the polyester resin. This is a very unexpected effect.

The invention according to claim 11 has a higher mechanical strength and flame retardancy in the resin molded body obtained even when it contains a phosphorus-based flame retardant than when it does not have this configuration. It has the effect that it is possible to achieve both levels. In particular, the fact that the mechanical strength can be achieved at a high level by the invention described in claim 11 is not necessarily suitable for applications where mechanical strength is required because the phosphorus-based flame retardant can cause hydrolysis of the aliphatic polyester resin. Considering what is considered not, it can be said to be a very unexpected effect.

Invention of Claim 12 is a case where it contains a phosphorus flame retardant, compared with the case where it does not have this configuration, in the resulting resin molded article, while maintaining the plantiness at a high level, The effect of the invention according to claim 11 that the mechanical strength and the flame retardancy can be achieved at a high level can be further improved.

Invention of Claim 13 is a case where it contains a phosphorus flame retardant, compared with the case where it does not have this configuration, in the resulting resin molded article, while maintaining the plantiness at a high level, The effect of the invention according to claim 11 or 12 that mechanical strength and flame retardancy can be achieved at a high level can be further improved.

  Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the drawings as the case may be.

(Resin composition)
The resin composition according to this embodiment contains an aliphatic polyester, a second polymer compound other than the aliphatic polyester, and an organic phosphate compound having a phosphorus content of 20% by mass or more. Here, the phosphorus content in the organic phosphoric acid compound means the mass ratio of the phosphorus element to the total mass of the organic phosphoric acid compound. The phosphorus content can be measured using, for example, fluorescent X-rays.
However, as the resin composition according to the present embodiment, the aliphatic polyester is contained in an amount of 20% by mass to 80% by mass with respect to the total amount of the resin composition, and the second polymer compound is polycarbonate, polyarylate. , Aromatic polyester, polyamide, polyimide, polymethyl methacrylate, polystyrene, polyoxymethylene, polyphenylene oxide, acrylonitrile-butadiene-styrene resin, polyacetal, polybutylene terephthalate, and polyether ketone, The organic phosphate compound is an ammonium polyphosphate having a phosphorus content of 27% by mass or more with respect to the total amount of the resin composition. 3 to 25% by mass Applying a resin composition.

  Although it does not restrict | limit especially as aliphatic polyester, What has biodegradability is preferable and plant-derived aliphatic polyester is more preferable. Specifically, polylactic acid, poly (3-hydroxybutyric acid), polybutylene succinate, polybutylene adipate, polyethylene succinate, polyethylene adipate, polypropylene succinate, polypropylene adipate, polyhexylene succinate, polyhexylene adipate, etc. Is mentioned. Among these aliphatic polyesters, polylactic acid is preferable from the viewpoint of a balance between flame retardancy and mechanical strength (particularly impact strength). These aliphatic polyesters may be used individually by 1 type, and may be used in combination of 2 or more type. Two or more kinds of copolymers of these aliphatic polyesters may be used.

  The weight average molecular weight of the aliphatic polyester is preferably from 5,000 to 200,000, more preferably from 10,000 to 120,000. The number average molecular weight of the aliphatic polyester is preferably 3000 or more and 100,000 or less, more preferably 5000 or more and 70000 or less. If the weight average molecular weight and number average molecular weight of the aliphatic polyester are each less than the lower limit value, the impact strength tends to be insufficient, and if the upper limit value is exceeded, the moldability tends to be insufficient. .

  The content of the aliphatic polyester is not particularly limited, but is preferably 20% by mass or more and 80% by mass or less, more preferably 30% by mass or more and 70% by mass or less, based on the total amount of the resin composition. If the content of the aliphatic polyester is less than the lower limit, the plant degree and recyclability tend to decrease and the environmental load tends to increase, and if the upper limit is exceeded, mechanical strength and heat resistance are insufficient. Tend to be.

  Specific examples of the second polymer compound include polycarbonate, polyarylate, aromatic polyester, polyamide, polyimide, polymethyl methacrylate, polystyrene, polyoxymethylene, polyphenylene oxide, acrylonitrile-butadiene-styrene resin (ABS). Resin), polyacetal, polybutylene terephthalate, polyether ketone and the like. Among these, polycarbonate and ABS resin are preferable and polycarbonate is particularly preferable because higher impact strength improvement effect can be obtained. These 2nd high molecular compounds may be used individually by 1 type, and may be used in combination of 2 or more type. Two or more copolymers of these polymer compounds can also be used as the second polymer compound.

  In addition, the second polymer compound preferably has a glass transition point of 80 ° C. or higher, more preferably 100 ° C. or higher, from the viewpoint of improving compatibility during melt-kneading and the appearance of the molded product. In addition, the glass transition point of a 2nd high molecular compound means the glass transition point measured as follows. That is, a calorimetric spectrum was measured with a differential calorimeter (Shimadzu Corporation, suggested differential scanning calorimeter DSC-60) at a heating rate of 10 ° C. per minute, and the tangent method was performed from the peak derived from the glass transition. The intermediate value (Tgm) of the two shoulder values obtained by the above was defined as the glass transition point.

  The weight average molecular weight of the second polymer compound is preferably 5000 or more and 100,000 or less, more preferably 10,000 or more and 80000 or less. Further, the number average molecular weight of the second polymer compound is preferably 2500 or more and 40000 or less, more preferably 3000 or more and 30000 or less. If the weight average molecular weight and number average molecular weight of the second polymer compound are each less than the lower limit value, the impact strength tends to be insufficient, and if the upper limit value is exceeded, the moldability becomes insufficient. There is a tendency. The weight average molecular weight and number average molecular weight of the second polymer compound in the resin composition mean the weight average molecular weight and number average molecular weight measured for the second polymer compound by gel permeation chromatography. As the gel permeation chromatograph, HLC-8220GPC manufactured by Tosoh Corporation can be used. When obtaining the weight average molecular weight and number average molecular weight of the second polymer compound in the resin composition, the measurement sample is dissolved in deuterated chloroform at a concentration of 0.1% by mass, and gel permission chromatography is used. In the graph, the weight average molecular weight and the number average molecular weight of the second polymer compound separated from the solution can be measured.

  The content of the second polymer compound is preferably 5% by mass or more and 70% by mass or less, more preferably 20% by mass or more and 50% by mass or less, based on the total amount of the resin composition. When the content of the second polymer compound is less than the lower limit value, the heat resistance tends to decrease, and when the content exceeds the upper limit value, the molding temperature increases, and the mechanical strength of the resulting resin molded body is high. It tends to decrease.

  Examples of the organic phosphate compound having a phosphorus content of 20% by mass or more (hereinafter sometimes simply referred to as “organophosphate compound”) include phosphate esters, condensed phosphate esters, polyphosphates, red phosphorus Etc. Among these, since a higher impact strength improvement effect is obtained, polyphosphate is preferable, and specifically, ammonium polyphosphate is more preferable. These organophosphate compounds may be used alone or in combination of two or more.

  The organic phosphate compound preferably has a molecular weight of 80,000 or more and 150,000 or less from the viewpoint of further improving the impact strength while making the flame retardancy sufficient. The molecular weight of the organic phosphate compound means the molecular weight of the structural unit multiplied by the number of repeating units.

  When the resin composition of this embodiment contains ammonium polyphosphate as an organic phosphate compound, the number of repeating units of ammonium polyphosphate is preferably 800 or more, and more preferably 800 or more and 1000 or less. By including such an ammonium polyphosphate, the impact resistance strength can be further improved while making the flame retardancy of the resin composition sufficient.

  In addition, the ammonium polyphosphate used in the present embodiment needs to have a phosphorus content of 20% by mass or more, but achieves both a high level of flame retardancy and mechanical strength (particularly impact strength). From the viewpoint, it is more preferably 27% by mass or more, and further preferably 29% by mass or less. The phosphorus content in the ammonium polyphosphate is preferably 50% by mass or less, more preferably 40% by mass or less, and still more preferably 30% by mass or less. When the content of phosphorus in ammonium polyphosphate exceeds 50% by mass, phosphoric acid volatilizes during kneading and molding, promoting the decomposition of the aliphatic polyester and the second polymer compound, and the mechanical strength decreases. It tends to be easier.

  The content of the organic phosphate compound is preferably 3% by mass or more and 20% by mass or less, more preferably 5% by mass or more and 15% by mass or less, based on the total amount of the resin composition. If the content of the organic phosphoric acid compound is less than the lower limit, it tends to be difficult to achieve both flame retardancy and mechanical strength (particularly impact strength), and if the content exceeds the upper limit, molding is performed. Of course, when the temperature of the use environment becomes high, a gas containing phosphorus is generated, and in some cases, the resin composition may be excessively heated.

  In the resin composition according to the present embodiment, the aliphatic polyester, the second polymer compound other than the aliphatic polyester, and the organic phosphate compound having a phosphorus content of 20% by mass or more are contained as essential components. Thus, mechanical strength and flame retardancy can be achieved at a high level. The reason why such an effect is achieved by the above-described configuration is that an organic phosphate compound having a phosphorus content of 20% or more chemically acts on both the aliphatic polyester and the second polymer compound, The present inventors speculate that this is to improve the compatibility of the above.

  Moreover, since the resin composition according to the present embodiment has excellent characteristics as described above, it is also useful in that the content of the flame retardant can be reduced while maintaining the flame retardancy at a high level. is there. For example, in the case of a resin composition not having the above-described configuration, it is necessary to contain a large amount of a flame retardant (for example, about 30% by mass) in order to achieve UL-V2 in the flame retardant test. In the form, UL-V2 can be achieved even if the content of the organophosphate compound is reduced to about 3% by mass.

  The resin composition according to the present embodiment further contains a flame retardant other than the organic phosphoric acid compound (hereinafter referred to as “other flame retardant” for convenience) as long as the effect is not impaired. Also good. Examples of other flame retardants include phosphorus flame retardants other than the organic phosphate compounds, bromine flame retardants, silicone flame retardants, and inorganic particle flame retardants. Among these, it is preferable to use the compound represented by the following general formula (I) from the viewpoint of improving solvent resistance.

In general formula (I), Ar ¹ represents a substituted or unsubstituted arylene group, a substituted or unsubstituted biphenylene group, or a substituted or unsubstituted bisphenol-type arylene group, and Ar ² and Ar ³ are each independently Represents a substituted or unsubstituted aryl group, and R ¹ and R ² each independently represents a substituted or unsubstituted alkyl group having 1 to 10 carbon atoms, or a substituted or unsubstituted aryl group.

  Specific examples of such a compound include PX-200 (produced by Daihachi Chemical Co., Ltd.) represented by the following structural formula (I-1) and CR-741 represented by the following structural formula (I-2). (Daihachi Chemical Co., Ltd.).

  From the viewpoint of achieving both flame retardancy and mechanical strength, the content of the other flame retardant is preferably 10% by mass or less, preferably 5% by mass or less, based on the total amount of the resin composition. More preferred. The content of the other flame retardant is preferably 5% by mass or more and 50% by mass or less, more preferably 10% by mass or more and 40% by mass or less based on the organophosphate compound.

  The resin composition according to this embodiment may be composed of an aliphatic polyester, a second polymer compound, and an organic phosphoric acid compound having a phosphorus content of 20% by mass or more. Since it is possible to achieve both higher flame retardancy and particularly improved impact strength, it has an elastomer with a core-shell structure of core and shell, an elastomer with a structure without a shell, and a side chain. It is preferable to further contain an elastomer such as an elastomer having a branched structure (hereinafter sometimes collectively referred to simply as “elastomer”). Examples of the elastomer core having a core-shell structure include butadiene, styrene, methyl methacrylate, acrylonitrile, vinyl acetate, and the like. Examples of the shell include alkyl acrylate, alkyl methacrylate, polysiloxane and the like. These can be appropriately selected according to the type of the aliphatic polyester and the second polymer compound. The modification of the core in the elastomer having the core-shell structure may be performed by graft polymerization, or may be performed by immersing the core in a solution in which the shell material is dissolved in a solvent.

  The above effect can be obtained by blending an elastomer into the resin composition according to the present embodiment because the organic phosphoric acid compound having a large phosphorus content according to the present invention also functions as a dispersion aid. The present inventors consider that the effect of improving the impact strength by the elastomer is effectively expressed by dispersing more uniformly.

  The average particle size of the elastomer is preferably 0.5 μm or more and 50 μm or less, more preferably 2 μm or more and 20 μm or less. If the average particle size of the elastomer is less than 0.5 μm, the impact strength improving effect tends to be insufficient, and if it exceeds 50 μm, the dispersibility of the elastomer in the resin composition tends to decrease. In some cases, the impact strength of the resin composition may be reduced by including an elastomer in the resin composition.

  Examples of the elastomer include, for example, “METABLEN S-2001”, “METABLEN SRK200” and “METABLEN SX-005” (trade name, manufactured by Mitsubishi Rayon Co., Ltd.) which are silicone / acrylic rubbers, and “METABLEN W” which is an acrylic rubber type. -450A "(trade name, manufactured by Mitsubishi Rayon Co., Ltd.)," METABLEN C-223A "," METABLEN C-215A "," METABLEN C-202 ", and" METABLENE 901 "(made by Mitsubishi Rayon Co., Ltd.). , Trade name), “JSR SL552”, “JSR 574” (trade name, manufactured by JSR Corporation) and the like, which are styrene / butadiene series, are commercially available.

  In the resin composition according to the present embodiment, a core-shell structure of a core made of butadiene and a shell made of acrylic is used from the viewpoint of achieving both flame retardancy and mechanical strength (particularly impact strength) at a higher level. Preferably having a core-shell structure of a core made of silicone rubber and a shell made of acrylic, and a core made of butadiene in terms of suppressing cracks originating at the interface in the resin composition, Those having a core-shell structure with an acrylic shell are more preferably used. The elastomer having a core-shell structure of a core made of butadiene and a shell made of acrylic is chemically bonded to any of aliphatic polyester, the second polymer compound, and an organic phosphate compound having a phosphorus content of 20% or more. Acrylic graft butadiene rubber is preferred in that it is easy to form and has strong adhesion between the core and the shell.

  In addition, the resin composition according to the present embodiment further includes additives such as a filler, an antioxidant, a reinforcing agent, a compatibilizing agent, a weathering agent, a reinforcing agent, and a hydrolysis-resistant agent, a catalyst, and the like, as necessary. Can be contained. The contents of these additives and catalyst are each preferably 10% by mass or less based on the total amount of the resin molded body.

  Among the fillers, a filler having an aspect ratio of 3 or more and 20 or less is preferable. Specifically, natural fillers such as kenaf, bamboo fiber, mica, walnut husk, and coffee husk having an aspect ratio of 3 to 20 are suitable. When a filler having an aspect ratio of 3 or more and 20 or less is used, Rockwell hardness and surface impact strength can be improved while maintaining both mechanical strength and flame retardancy. This is because when the weight average molecular weight of the second polymer compound is smaller than the weight average molecular weight of the aliphatic polyester, the filler having an aspect ratio of 3 to 20 causes the aliphatic polyester to crystallize, The present inventors infer that this is because the second polymer compound wraps the crystallized product.

  Other preferable examples of the filler include at least one selected from carbon nanotubes and fullerenes. When these carbon nanotubes and fullerenes are used, hydrolysis resistance can be improved while maintaining both mechanical strength and flame retardancy. The present inventors speculate that this is because carbon nanotubes and fullerenes react with the end groups of the aliphatic polyester, the second polymer compound, and the organophosphate compound.

  The resin composition according to this embodiment preferably contains a hydrolysis-resistant agent from the viewpoint of achieving both higher mechanical strength and flame retardancy at a higher level, and particularly improving the impact strength. Examples of the hydrolysis-resistant agent include compounds having reactivity with active hydrogen in the resin composition, specifically, carbodiimide compounds, isocyanate compounds such as diisocyanate and triisocyanate, hydroxy compounds and dihydroxy compounds. Examples thereof include polyfunctional hydroxy compounds, polyfunctional carboxylic acids such as dicarboxylic acid and tricarboxylic acid and ester derivatives thereof, polyfunctional amine compounds such as diamine and triamine, and oxozoline compounds. Among these, a carbodiimide compound and an isocyanate compound are preferable in terms of improving the heat and humidity resistance. Furthermore, the carbodiimide compound is preferable in that it can be melt kneaded with a resin such as aliphatic polyester, and a sufficient hydrolysis preventing effect can be obtained with a small amount of addition.

In addition, the resin composition according to the present embodiment preferably has a Charpy impact strength of 2.8 kJ / m ² or more, more preferably 6 kJ / m ² or more when formed into a resin molded body. Here, the Charpy impact resistance strength means that obtained by a method based on the ISO-179 standard. The resin composition according to this embodiment having a Charpy impact strength of 3 kJ / m ² or more is particularly suitable for forming a resin molded body used for a housing of an electronic device.

  In addition, the resin composition according to the present embodiment preferably has a flexural modulus of 1500 MPa or more and 3000 MPa or less when formed into a resin molded body. In addition, the bending elastic modulus here means what was calculated | required by the method based on the standard of ISO-178. The resin composition according to this embodiment having a flexural modulus within the above range is particularly suitable for forming a resin molded body used for a cover having a snap fit portion.

(Resin molding)
The resin molding which concerns on 1st Embodiment of this invention contains the resin composition which concerns on this embodiment mentioned above. Thereby, even if the resin molded body of this embodiment contains a phosphorus flame retardant, mechanical strength and flame retardancy are at a high level compared to a resin molded body that does not have this configuration. It is possible to achieve both. In view of the fact that such an effect is obtained, it is considered that the phosphorus-based flame retardant may cause hydrolysis of the aliphatic polyester resin, and thus is not necessarily suitable for applications requiring mechanical strength. This is an extremely unexpected effect.

In addition, the resin molded body according to the second embodiment of the present invention satisfies the condition that the molecular weight distribution of the aliphatic polyester and the second polymer compound in the resin molded body is represented by the following formula (1). is there.
Mw (1) / Mn (1) ≧ Mw (2) / Mn (2) (1)
[In formula (1), Mw (1) and Mn (1) represent the weight average molecular weight and number average molecular weight of the aliphatic polyester, respectively, and Mw (2) and Mn (2) represent the second polymer, respectively. The weight average molecular weight and number average molecular weight of a compound are shown. ]

Moreover, it is preferable that the resin molded body which concerns on the 2nd Embodiment of this invention is what satisfy | fills the conditions where the molecular weight distribution of the 2nd high molecular compound in a resin molded body is represented by following formula (2). .
Mw (2) / Mn (2) ≦ 2.5 (2)
[In formula (2), Mw (2) and Mn (2) represent the weight average molecular weight and the number average molecular weight of the second polymer compound, respectively. ]

  The aliphatic polyester is not particularly limited, and examples thereof include polybutylene succinate, polyethylene succinate, polybutylene adipate, polylactic acid, and poly-3-hydroxybutyric acid. Among these aliphatic polyesters, polylactic acid is preferable from the viewpoint of a balance between flame retardancy and mechanical strength (particularly impact strength). These aliphatic polyesters may be used individually by 1 type, and may be used in combination of 2 or more type. Two or more kinds of copolymers of these aliphatic polyesters may be used.

  The ratio Mw (1) / Mn (1) between the weight average molecular weight Mw (1) and the number average molecular weight Mn (1) of the aliphatic polyester is not particularly limited as long as the above formula (1) is satisfied. 7 or more and 4.0 or less, more preferably 2.1 or more and 3.5 or less. The weight average molecular weight Mw (1) of the aliphatic polyester is preferably 5000 or more and 200000 or less, more preferably 10,000 or more and 120,000 or less. The number average molecular weight Mn (1) of the aliphatic polyester is preferably 3000 or more and 100,000 or less, more preferably 5000 or more and 70,000 or less, from the viewpoint of moldability and mechanical strength. When the weight average molecular weight Mw (1) and the number average molecular weight Mn (1) of the aliphatic polyester are each less than the lower limit, the impact strength tends to be insufficient, and when the upper limit is exceeded, the moldability is increased. Tends to be insufficient.

  The content of the aliphatic polyester is not particularly limited, but is preferably 20% by mass or more and 80% by mass or less, more preferably 30% by mass or more and 70% by mass or less, based on the total amount of the resin molded body. If the content of the aliphatic polyester is less than 20% by mass, the recyclability tends to decrease and the environmental load tends to increase, and if the upper limit is exceeded, the mechanical strength and heat resistance tend to be insufficient. is there.

  The second polymer compound other than the aliphatic polyester is not particularly limited as long as the weight average molecular weight and the number average molecular weight satisfy the condition represented by the above formula (1). For example, polycarbonate, polyester, polymethyl Examples include methacrylate, polystyrene, polypropylene, polyethylene, and acrylonitrile-butadiene-styrene resin (ABS resin). Among these, polycarbonate and ABS resin are preferable because higher impact strength improvement effect can be obtained. These 2nd high molecular compounds may be used individually by 1 type, and may be used in combination of 2 or more type. Two or more copolymers of these polymer compounds can also be used as the second polymer compound.

  The ratio Mw (2) / Mn (2) between the weight average molecular weight Mw (2) and the number average molecular weight Mn (2) of the second polymer compound is flame retardancy and mechanical strength (especially impact strength). From the viewpoint of balance with the above, it is preferably 2.5 or less in the resin molded body, more preferably 1.5 or more and 2.5 or less, and still more preferably 1.7 or more and 2.3 as described above. It is as follows. When the resin molding contains two or more polymer compounds other than aliphatic polyester, at least one polymer compound other than aliphatic polyester is represented by the above formula (1), preferably the above formula (1) and If the conditions represented by (2) are satisfied, the remaining polymer compounds do not necessarily satisfy the conditions represented by the above formulas (1) and (2). However, since flame retardance and mechanical strength (especially impact strength) can be balanced at a higher level, all of the polymer compounds other than aliphatic polyester satisfy the condition represented by the above formula (1). It is preferable that the conditions represented by the above formulas (1) and (2) are satisfied.

  Moreover, the weight average molecular weight Mw (2) of the second polymer compound is preferably 5000 or more and 100,000 or less, more preferably 10,000 or more and 80000 or less. Further, the number average molecular weight Mn (2) of the second polymer compound is preferably 2500 or more and 40000 or less, more preferably 3000 or more and 30000 or less. When the weight average molecular weight Mw (2) and the number average molecular weight Mn (2) of the second polymer compound are each less than the lower limit, the impact strength tends to be insufficient, and exceeds the upper limit. And formability tends to be insufficient.

  The content of the second polymer compound is preferably 10% by mass or more and 70% by mass or less, more preferably 20% by mass or more and 50% by mass or less, based on the total amount of the resin molded body. When the content of the aliphatic polyester is less than the lower limit value, the heat resistance tends to decrease, and when the content exceeds the upper limit value, the molding temperature increases and the mechanical strength of the molded body tends to decrease.

  In this embodiment, the weight average molecular weight and the number average molecular weight of the aliphatic polyester and the second polymer compound in the resin molded body are measured from the surface of the resin molded body cooled in a liquid nitrogen atmosphere. The sample for measurement was dissolved in deuterated chloroform at a concentration of 0.1% by mass, and the weight average molecular weight measured for each of the separated aliphatic polyester or second polymer compound by gel permeation chromatography And number average molecular weight. Further, in the present invention, HLC-8220GPC manufactured by Tosoh Corporation is used as the gel permeation chromatograph.

  Further, the phosphorus content in the organophosphate compound according to the present embodiment is required to be 20% by mass or more, preferably 27% by mass or more, and more preferably 29% by mass or less. When the phosphorus content in the organic phosphate compound is less than 20% by mass, it tends to be difficult to achieve both flame retardancy and mechanical strength (particularly impact strength). Further, the phosphorus content in the organic phosphoric acid compound is preferably 50% by mass or less, more preferably 40% by mass or less, and further preferably 30% by mass or less. If the phosphorus content in the organic phosphoric acid compound exceeds 50% by mass, phosphoric acid volatilizes during kneading and molding, promoting the degradation of the aliphatic polyester and the second polymer compound, and reducing the mechanical strength. It tends to be easy to do. Here, the phosphorus content in the organic phosphate compound means the mass ratio of the phosphorus element to the total mass of the organic phosphate compound. The phosphorus content can be measured using, for example, fluorescent X-rays.

  In addition, the content of the organic phosphate compound is preferably selected so that the phosphorus content in the resin molded body is 1% by mass or more based on the total amount of the resin molded body. When the content of phosphorus in the resin molding is less than 1% by mass, it tends to be difficult to achieve both flame retardancy and mechanical strength (particularly impact strength). Moreover, it is preferable to select so that the content of phosphorus in the resin molded body is 20% by mass or less. If the content of phosphorus in the resin molding exceeds 20% by mass, not only the molding process but also the temperature of the usage environment will be high, gas containing phosphorus will be generated, and in some cases it will ignite. There is.

  In addition, as long as the effect is not impaired, the resin molding which concerns on the 2nd Embodiment of this invention uses flame retardants (henceforth "other flame retardants" for convenience) other than an organic phosphate compound. Furthermore, you may contain. Examples of other flame retardants include phosphorus flame retardants other than the organic phosphate compounds, bromine flame retardants, silicone flame retardants, and inorganic particle flame retardants. From the viewpoint of achieving both flame retardancy and mechanical strength, the content of the other flame retardant is preferably 10% by mass or less, preferably 5% by mass or less, based on the total amount of the resin molded body. More preferably, no other flame retardant is contained.

  The resin molded body according to the second embodiment of the present invention may be composed only of an aliphatic polyester, a second polymer compound, and an organic phosphate compound having a phosphorus content of 20% by mass or more. However, since the mechanical strength and the flame retardancy can be achieved at a higher level, particularly the impact strength can be further improved, an elastomer having a core-shell structure of a core and a shell, and a structure having no shell. It is preferable to further contain an elastomer, such as an elastomer having a branched structure having a side chain (hereinafter, sometimes simply referred to as “elastomer”). Examples of the elastomer core having a core-shell structure include butadiene, styrene, methyl methacrylate, acrylonitrile, vinyl acetate, and the like. Examples of the shell include alkyl acrylate, alkyl methacrylate, polysiloxane and the like. These can be appropriately selected according to the type of the aliphatic polyester and the second polymer compound. The modification of the core in the elastomer having the core-shell structure may be performed by graft polymerization, or may be performed by immersing the core in a solution in which the shell material is dissolved in a solvent. The average particle size of the elastomer is preferably 0.5 μm or more and 50 μm or less, more preferably 2 μm or more and 20 μm or less. If the average particle size of the elastomer is less than 0.5 μm, the impact resistance improving effect tends to be insufficient, and if it exceeds 50 μm, the dispersibility of the elastomer in the resin molded product tends to be lowered. In some cases, the impact strength of the resin molded body may be reduced by including the elastomer in the resin molded body.

  In addition, the resin molded body according to the second embodiment of the present invention includes additives such as a filler, an antioxidant, a reinforcing agent, a compatibilizing agent, a weathering agent, a reinforcing agent, and a hydrolysis inhibitor as necessary. Further, a catalyst or the like can be further contained. The contents of these additives and catalyst are each preferably 10% by mass or less based on the total amount of the resin molded body. Details of the additives and the like are the same as those described in the resin composition.

  The resin molded body according to the first and second embodiments of the present invention can be applied to a wide range of uses. Specific uses of the resin molded body of the present invention include electrical / electronic parts and their casings, automobile parts, building materials such as wallpaper and exterior materials, tableware, sheets, cushioning materials, and fibers. Among them, high impact strength, flame retardancy, and excellent hydrolysis resistance are required, and it is suitable for electronic device parts and casings that are used in large amounts and have a high low environmental impact effect. Here, the case means a case such as a home appliance, a container, or an electronic device, and the case of the electronic device is particularly preferable because excellent weather resistance is required.

  When the casing is configured using the resin molded body according to the present embodiment, the entire casing may be configured with the resin molded body according to the present embodiment, but a portion where performance such as surface impact strength is required. However, it is preferable that it is comprised by the resin molding which concerns on this embodiment. In this case, parts other than the said part may be comprised with resin molded objects other than the resin molded object which concerns on this embodiment. Specifically, a front cover, a rear cover, a paper feed tray, a paper discharge tray, a platen, and the like in the exterior of a printer, a copier, a fax machine, and the like are preferably formed of the resin molded body according to this embodiment. On the other hand, the interior cover, the toner cartridge, the process cartridge, and the like may be configured by any of the resin molded bodies according to the present embodiment or other resin molded bodies.

  FIG. 1 is a diagram illustrating an example of an image forming apparatus including a casing and components configured using a resin molded body according to the present embodiment, and is an external perspective view of the image forming apparatus 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 opened and closed so that an operator can operate the inside of the apparatus. Thus, the operator can replenish the toner when the toner is exhausted, replace the exhausted process cartridge, and remove 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 body 110, there are provided 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 placed. Yes. Further, the main body device 110 includes an automatic document feeder 134 that can automatically convey a document on the copy glass 132. 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 can be 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 can be 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 disposed near the end of the transport path and sent out to the transport path. Further, a manual paper tray 136 is provided on the side surface of the main body 110, and paper can be supplied from here.

  The paper on which the image is formed by the image forming unit is sequentially transferred between two fixing rolls that are supported by a casing 152 constituting a part of the main body device 110 and abut against each other. Paper is discharged to the outside. The main body device 110 is provided with a plurality of discharge trays 138 on the side opposite to the side on which the paper tray 136 is provided, and paper after image formation is discharged to these trays.

  In the image forming apparatus 100, the front covers 120a and 120b are subjected to many loads such as stress and impact during opening and closing, vibration during image formation, and heat generated in the image forming apparatus. Further, the process cartridge 142 receives a lot of loads such as attachment / detachment impact, vibration during image formation, and heat generated in the image forming apparatus. Further, the housing 150 and the housing 152 receive many loads such as vibration during image formation and heat generated in the image forming apparatus. Therefore, the resin molded body according to this embodiment is preferably used as the front covers 120a and 120b of the image forming apparatus 100, the exterior of the process cartridge 142, the casing 150, and the casing 152.

(Production method of resin molding)
The method for producing a resin molded body according to the first embodiment of the present invention includes an aliphatic polyester, a second polymer compound other than the aliphatic polyester, and an organic phosphoric acid having a phosphorus content of 20% by mass or more. A first step of kneading a resin composition containing the compound under conditions where the temperature of the resin composition is 220 ° C. or lower, and molding the kneaded body obtained in the first step, to form a resin A second step of obtaining a body
However, in the method for producing a resin molded body according to the present embodiment, as the resin composition, aliphatic polyester is contained in an amount of 20% by mass to 80% by mass with respect to the total amount of the resin composition, and the second high The molecular compound is selected from polycarbonate, polyarylate, aromatic polyester, polyamide, polyimide, polymethyl methacrylate, polystyrene, polyoxymethylene, polyphenylene oxide, acrylonitrile-butadiene-styrene resin, polyacetal, polybutylene terephthalate, and polyether ketone. Is an ammonium polyphosphate containing at least 5% by mass and not more than 70% by mass with respect to the total amount of the resin composition, and the organic phosphate compound has a phosphorus content of at least 27% by mass. , 3 mass to the total amount of the resin composition Applying a resin composition contained 25 wt% or less.

Moreover, the method for producing a resin molded body according to the second embodiment of the present invention includes molding the kneaded body obtained in the first step, the aliphatic polyester and the second polymer compound in the resin molded body. And a second step of obtaining a resin molded body that satisfies the molecular weight distribution of the following formula (1).
Mw (1) / Mn (1) ≧ Mw (2) / Mn (2) (1)
[In formula (1), Mw (1) and Mn (1) represent the weight average molecular weight and number average molecular weight of the aliphatic polyester, respectively, and Mw (2) and Mn (2) represent the second polymer compound, respectively. A weight average molecular weight and a number average molecular weight are shown. ]

Further, in the method for producing a resin molded body according to the second embodiment of the present invention, in the second step, the molecular weight distribution of the second polymer compound in the resin molded body is represented by the following formula (2). It is preferable that it satisfies the following conditions.
Mw (2) / Mn (2) ≦ 2.5 (2)
[In formula (2), Mw (2) and Mn (2) represent the weight average molecular weight and the number average molecular weight of the second polymer compound, respectively. ]

  In the production method according to the second embodiment, the weight average molecular weight and the number average molecular weight of the aliphatic polyester and the second polymer compound can be changed through the first step and the second step. Therefore, the weight average molecular weight and number average molecular weight of the aliphatic polyester and the second polymer compound contained in the resin composition are appropriately selected according to the kneading conditions in the first step, the molding conditions in the second step, and the like. However, the weight average molecular weight and the number average molecular weight of the aliphatic polyester and the second polymer compound in the resin composition before kneading do not necessarily satisfy the conditions represented by the above formulas (1) and (2). It does not have to be.

  Moreover, in the manufacturing method which concerns on 1st Embodiment and 2nd Embodiment, about the aliphatic polyester and 2nd high molecular compound in the resin composition before kneading, the average particle diameter is 1 mm or more and 2 mm or less. It is preferable to coarsely pulverize before kneading so as to be in the range. When the average particle diameter of the aliphatic polyester and the second polymer compound exceeds 2 mm, so-called screw biting occurs in the kneader and the torque tends to increase. Further, when the average particle size of the aliphatic polyester and the second polymer compound is less than 1 mm, the viscosity tends to increase.

  In the case where the target resin molded body contains an elastomer having a core-shell structure of a core made of butadiene and a shell made of acrylic, or further contains the above-mentioned additives, kneading is performed in the first step. These components can be mix | blended with the resin composition to be provided.

  In the first step, the temperature of the resin composition at the time of kneading is 220 ° C. or lower as described above, and preferably 80 ° C. or higher and 100 ° C. or lower. When the resin composition is kneaded under such temperature conditions, the fluidity of the kneaded body in the molding machine can be sufficiently improved even if the temperature of the kneaded body during molding in the second step is 220 or less. Since the melting point of the aliphatic polyester is lower than the melting point of the second polymer compound, the kneaded body has an improved fluidity because the melted aliphatic polyester coats the particle surface of the second polymer compound to form composite particles. It is inferred that this is caused by the formation of

  In addition, examples of the molding method in the second step include injection molding, extrusion molding, blow molding, and hot press molding. Among these, injection molding is preferable.

  When the resin molded body according to this embodiment is manufactured by injection molding, the kneaded body obtained in the first step may be administered as a compound to an injection molding machine, or the kneaded body may be administered after kneading in the first step. Injection molding may be performed as it is.

  In the production method according to the second embodiment, the molding conditions in the second step are such that the molecular weight distribution of the aliphatic polyester and the second polymer compound in the obtained resin molding is the above formula (1), preferably the above Although not particularly limited as long as the conditions represented by the formulas (1) and (2) are satisfied, for example, in the case of injection molding, the temperature of the kneaded body in the injection molding machine is 220 ° C. or lower, more preferably 170 ° C. or higher and 220 ° C. or lower. It is preferable to perform injection molding under the following conditions. When controlling the temperature of the kneaded body in the injection molding machine, it is preferable to use the temperature near the outlet of the injection molding machine as an index. The cylinder temperature is preferably 150 ° C. or higher and 240 ° C. or lower, the mold temperature is 20 ° C. or higher and 60 ° C. or lower, and the cooling time is preferably 10 seconds or longer and 120 seconds or shorter. Also in the manufacturing method according to the first embodiment, the molding conditions in the second step are preferably the above conditions.

  Here, the fact that the temperature of the kneaded body can be injection-molded so as to be 220 ° C. or less, and that the resin molded body obtained by such injection molding can achieve both flame retardancy and mechanical strength are extremely unexpected effects. Therefore, it is very useful in the production of a resin molded body.

  That is, if an aliphatic polyester such as polylactic acid is used alone, it can be injection-molded at 220 ° C. or less. However, if polycarbonate or the like is mixed with the aliphatic polyester, the fluidity is remarkably reduced and the molding machine rotates. In general, the torque increases rapidly, and the resin material does not sufficiently reach the mold due to insufficient fluidity. Therefore, in order to ensure the fluidity of the resin material, it is necessary to mold at a relatively high temperature (for example, 240 ° C. or higher), but when the resin composition further contains an organic phosphate compound, the temperature is high. The organic phosphoric acid compound is decomposed by this injection molding, and hydrolysis of the aliphatic polyester is promoted. Therefore, it is very difficult to achieve both flame retardancy and mechanical strength in the obtained resin molded body.

  On the other hand, according to this embodiment, the fluidity of the kneaded body in the injection molding machine can be sufficiently ensured, while the decomposition of the organic phosphate compound and the hydrolysis of the aliphatic polyester are sufficiently performed. Since it can suppress, it becomes possible to make a flame retardance and mechanical strength compatible in the resin molding obtained. The reason why such an excellent effect can be obtained is as follows: (i) The effect of improving the fluidity of the kneaded body by kneading so that the temperature of the resin composition is 220 ° C. or lower in the first step, (ii) A function as a lubricant of an organic phosphoric acid compound having a phosphorus content of 20% by mass to 50% by mass can be considered. Further, as described above, (iii) the aliphatic polyester and the second polymer compound in the resin composition before kneading are mixed before kneading so that the average particle diameter is in the range of 1 mm to 2 mm. In the case of coarse pulverization in advance, the contribution of such pulverization can be considered.

EXAMPLES Hereinafter, although this invention is demonstrated more concretely based on an Example and a comparative example, this invention is not limited to a following example at all.
In this example, Examples B-11 and B-12 correspond to reference examples.

(Example A-1)
32.2 parts by mass of polylactic acid as an aliphatic polyester (Lacia H-100, manufactured by Mitsui Chemicals, Mw / Mn = 2.6) and polycarbonate as a second polymer compound (Panlite L1225Y, Teijin Chemicals Ltd.) Made of butadiene, Mw / Mn = 2.1) 48.3 parts by mass, ammonium polyphosphate (Exorit AP422, made by Clariant, phosphorus content: 28% by mass, Mw = 120,000) 10.0% by mass, and butadiene 7.5 parts by mass of an elastomer (metabrene C233A, manufactured by Mitsubishi Rayon Co., Ltd.) having a core-shell structure of a core and an acrylic shell, 1.0 part by mass of a weathering agent (Adeka Stub LA-29, manufactured by ADEKA), and water resistance A biaxial kneading apparatus (laboratory) containing 1.0 part by mass of a decomposing agent (Carbodilite LA-1, manufactured by Nittobo) (Plasto mill, manufactured by Toyo Seiki Co., Ltd.) so that the temperature of the resin composition was 220 ° C. Next, by using the obtained compound, injection molding is performed with an injection molding apparatus (Nissei Plastic Co., NEX150) under conditions of a cylinder temperature of 200 ° C. and a mold temperature of 60 ° C., and the resin molded body is an ISO multipurpose. Dumbbell test pieces (ISO527) and UL94 test pieces (thickness 2 mm) were obtained. The temperature of the kneaded body in the vicinity of the exit of the injection molding machine at the time of injection molding was 220 ° C. Table 1 shows the molecular weight distribution of the aliphatic polyester and the second polymer compound in the obtained resin molding.

  Next, using the obtained ISO multi-purpose dumbbell test piece, the notched Charpy impact strength was measured with an impact strength measuring device (Toyo Seiki, DG-C), and the bending strength was measured with Instron (Toyo Seiki, Stroke). Each measurement was made on a graph V50). Moreover, UL-V combustion test was implemented by the method based on UL-94 using the obtained UL94 test piece. The obtained results are shown in Table 1.

(Examples A-2 to A-16, Comparative Examples A-1 to A-2)
In Examples A-2 to A-16 and Comparative Examples A-1 to A-2, the resin compositions used for kneading were changed to the compositions shown in Tables 1 to 5, respectively, or during injection molding Except that the temperature of the kneaded body was changed to the temperatures shown in Tables 1 to 5, kneading and injection molding were carried out in the same manner as in Example A-1, and as a resin molded body, an ISO multipurpose dumbbell test piece (ISO527) and A UL94 test piece (thickness 2 mm) was obtained. Tables 1 to 5 show the molecular weight distributions of the aliphatic polyester and the second polymer compound in the obtained resin moldings. Moreover, using each obtained ISO multipurpose dumbbell, the Charpy impact strength with notch was measured with an impact strength measurement device (manufactured by Toyo Seiki, DG-C). Moreover, UL-V combustion test was implemented by the method based on UL-94 using each obtained UL94 test piece. The obtained results are shown in Tables 1-5. In addition, Mw / Mn of polyhydroxybutyric acid (Biopol, manufactured by Monsanto) as the aliphatic polyester used in Example A-8 was 2.8 before kneading. Further, the Mw / Mn of the ABS resin (Clarastic GA704, manufactured by Japan A & L) as the second polymer compound used in Example A-9 was 2.4 before kneading. In Example A-13, “Host Flam AP422” (manufactured by Clariant, phosphorus content: 29 mass%, Mw = 45000) was used as the ammonium polyphosphate.

  Moreover, the solvent resistance test was implemented about Example A-1 and Example A-16. Specifically, using the above-mentioned ISO multipurpose dumbbell test piece, the test was performed by applying the three types of solvents and oil shown in Table 6 and fixing both ends of the test piece in an environment of temperature 25 ° C. and humidity 55%. The central portion of the piece was pressed from the surface opposite to the surface coated with the solvent to give a strain of 0.5%, and the presence or absence of cracks was evaluated after 20 hours. The results are shown in Table 6.

(Example B-1)
35.5 parts by mass of polylactic acid (Teramac TE-4000, manufactured by Unitika) as an aliphatic polyester, and 54.0 parts by mass of polycarbonate (Panlite L1225Y, manufactured by Teijin Chemicals) as a second polymer compound, 10.0 parts by mass of an ammonium polyphosphate represented by the following formula (A) as an organic phosphate compound (number of repeating units n = 800, Mw = 90000, phosphorus content: 29% by mass) and a hydrolysis-resistant agent ( Carbodilite LA-1 (manufactured by Nittobo Co., Ltd.), and a resin composition containing 0.5 parts by mass in a biaxial kneader (labor plast mill, manufactured by Toyo Seiki Co., Ltd.), the temperature of the resin composition is 210 ° C. The mixture was kneaded as described above to prepare a compound of the kneaded body.
-[(HPO ₃ ) NH ₃ ] _n- (A)

  Next, using the obtained compound, injection molding was performed with an injection molding apparatus (Nissei Resin, NEX150) under conditions of a cylinder temperature of 210 ° C. and a mold temperature of 40 ° C. Dumbbell test pieces (ISO527) and UL94 test pieces (thickness 2 mm) were obtained. The temperature of the kneaded body near the exit of the injection molding machine at the time of injection molding was 210 ° C.

  Next, using the obtained ISO multipurpose dumbbell, the notched Charpy impact strength was measured with an impact strength measuring device (Toyo Seiki, DG-C), and the flexural modulus was measured with Instron (Toyo Seiki, Strograph). V50), respectively. Moreover, UL-V combustion test was implemented by the method based on UL-94 using the obtained UL94 test piece. The results obtained are shown in Table 7.

(Examples B-2 to B-12, Comparative examples B-1 to B-3)
In Examples B-2 to B-12 and Comparative Examples B-1 to B-3, the composition of the resin composition used for kneading was changed to the composition shown in Tables 7 to 10, or at the time of injection molding. Except that the temperature of the kneaded body was changed to the temperatures shown in Tables 7 to 10, kneading and injection molding were carried out in the same manner as in Example B-1, and as a resin molded body, an ISO multipurpose dumbbell test piece (ISO527) and A UL94 test piece (thickness 2 mm) was obtained. Using each ISO multi-purpose dumbbell obtained, the notched Charpy impact strength was measured with an impact strength measuring device (Toyo Seiki, DG-C) and the bending strength was changed to Instron (Toyo Seiki, Strograph V50). Each was measured. Moreover, UL-V combustion test was implemented by the method based on UL-94 using each obtained UL94 test piece. The obtained results are shown in Tables 7-10.

In addition, ammonium polyphosphate as an organic phosphate compound used in Example B-2 has a repeating unit number n in the above formula (A) of 1500, a molecular weight of 145000, and a phosphorus content of 28% by mass. It is. Moreover, the ammonium polyphosphate as an organic phosphate compound used in Example B-3 is represented by the following formula (B), the number of repeating units m = 1120, Mw = 110000, and the phosphorus content: 27% by mass. belongs to.
-[(CH ₃ PO ₃ ) NH ₃ ] _m- (B)

  In addition, the ammonium polyphosphate as the organic phosphate compound used in Example B-11 has a repeating unit number n of 720 in the above formula (A), a molecular weight of 70000, and a phosphorus content of 25% by mass. It is. In addition, ammonium polyphosphate as an organic phosphate compound used in Example B-12 has a repeating unit number n of 1500 in the above formula (A), a molecular weight of 160000, and a phosphorus content of 20% by mass. It is.

(Example C-1)
An ISO multipurpose dumbbell test piece and a UL94 test piece were obtained in the same manner as in Example A-1, except that 2.0 parts by mass of a carbon nanotube (manufactured by Frontier Carbon Co., Ltd.) was further added.

  Next, using the obtained ISO multi-purpose dumbbell test piece, the bending fracture strain at a temperature of 25 ° C. and a humidity of 55% was measured by a bending tester (manufactured by Toyo Seiki Seisakusho Co., Ltd., Strograph VE) in accordance with ISO178 It was measured. Further, after leaving the ISO multipurpose dumbbell test piece for 1000 hours in an environment of a temperature of 65 ° C. and a humidity of 85%, the bending fracture strain was measured by the same method as described above.

  Further, using the obtained ISO multipurpose dumbbell test piece, a hard ball having a diameter of 50 mm and a weight of 500 g was dropped from a height of 1300 mm onto the test piece under the same conditions as the measurement of bending fracture strain, and cracks were generated. A steel ball drop test was performed to observe the presence or absence. Furthermore, this test piece was crushed and re-pelletized, a test piece was produced again under the same conditions as described above, and a steel ball drop test was performed at a temperature of 25 ° C. and a humidity of 55% to evaluate recyclability.

  Moreover, UL-V combustion test was implemented by the method based on UL-94 using the obtained UL94 test piece. The obtained results are shown in Table 11. Table 11 also shows the results for Example A-1 for reference.

(Example C-2)
In Example C-2, an ISO multipurpose dumbbell test piece and a UL94 test piece were obtained in the same manner as in Example A-1, except that 5.0 parts by mass of carbon nanotubes (manufactured by Frontier Carbon Co.) was further added. Evaluation was carried out in the same manner as in Example C-1 using the obtained ISO multipurpose dumbbell test piece and UL94 test piece. The obtained results are shown in Table 11.

(Example C-3)
In Example C-2, an ISO multipurpose dumbbell test piece and a UL94 test piece were obtained in the same manner as in Example A-1, except that 5.0 parts by mass of fullerene (C60) (manufactured by Frontier Carbon Co.) was further added. It was. Evaluation was carried out in the same manner as in Example C-1 using the obtained ISO multipurpose dumbbell test piece and UL94 test piece. The obtained results are shown in Table 11.

It is an external appearance perspective view which shows the image forming apparatus provided with the housing | casing and component which concern on one Embodiment of the resin molding of this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 100 ... Image forming apparatus, 110 ... Main body apparatus, 120a, 120b ... Front cover, 130 ... Operation panel, 132 ... Copy glass, 134 ... Automatic document feeder, 136 ... Paper tray, 140a-140c ... Paper storage cassette, 142 ... Process cartridge, 144... Operating lever, 146... Toner container, 148.

Claims (13)

An aliphatic polyester, a second polymer compound other than the aliphatic polyester, and an organic phosphoric acid compound having a phosphorus content of 27 % by mass or more ,
The aliphatic polyester is contained in an amount of 20% by mass to 80% by mass with respect to the total amount of the resin composition, and the second polymer compound is polycarbonate, polyarylate, aromatic polyester, polyamide, polyimide, polymethyl methacrylate. , Polystyrene, polyoxymethylene, polyphenylene oxide, acrylonitrile-butadiene-styrene resin, polyacetal, polybutylene terephthalate, and polyether ketone, and 5% by mass or more based on the total amount of the resin composition 70% by mass or less, and the organic phosphate compound is ammonium polyphosphate, and is contained in an amount of 3% by mass to 25% by mass with respect to the total amount of the resin composition. 2. The resin composition according to claim 1, wherein the organophosphate compound has a weight average molecular weight of 80000 to 150,000. The resin composition according to claim 1 or 2, wherein the number of repeating units of the ammonium polyphosphate is 800 or more. The resin composition according to any one of claims 1 to 3 , further comprising an elastomer. The resin composition according to claim 4 , wherein the elastomer has a core-shell structure of a core made of butadiene and a shell made of acrylic. The resin composition according to any one of claims 1 to 5 , wherein the aliphatic polyester is polylactic acid. The resin composition according to any one of Claims 1 to 6 , wherein the second polymer compound is at least one selected from polycarbonate and acrylonitrile-butadiene-styrene resin. The resin composition according to any one of claims 1 to 7 , further comprising a compound represented by the following general formula (I).

[In general formula (I), Ar ¹ represents a substituted or unsubstituted arylene group, a substituted or unsubstituted biphenylene group, or a substituted or unsubstituted bisphenol-type arylene group, and Ar ² and Ar ³ are each independently selected. Represents a substituted or unsubstituted aryl group, and R ¹ and R ² each independently represents a substituted or unsubstituted alkyl group having 1 to 10 carbon atoms, or a substituted or unsubstituted aryl group. ] A resin molded product comprising the resin composition according to any one of claims 1 to 8 . The resin molded body according to claim 9 , wherein molecular weight distribution of the aliphatic polyester and the second polymer compound in the resin molded body satisfies a condition represented by the following formula (1).
Mw (1) / Mn (1) ≧ Mw (2) / Mn (2) (1)
[In formula (1), Mw (1) and Mn (1) represent the weight average molecular weight and number average molecular weight of the aliphatic polyester, respectively, and Mw (2) and Mn (2) represent the second polymer, respectively. The weight average molecular weight and number average molecular weight of a compound are shown. ] An aliphatic polyester; a second polymer compound other than the aliphatic polyester; and an organic phosphoric acid compound having a phosphorus content of 27 % by mass or more , wherein the aliphatic polyester is added to the total amount of the resin composition. And the second polymer compound is polycarbonate, polyarylate, aromatic polyester, polyamide, polyimide, polymethyl methacrylate, polystyrene, polyoxymethylene, polyphenylene oxide, acrylonitrile. -At least one selected from butadiene-styrene resin, polyacetal, polybutylene terephthalate, and polyetherketone, contained in an amount of 5% by mass to 70% by mass with respect to the total amount of the resin composition, The acid compound is ammonium polyphosphate What, a first step of the resin composition the total amount resin composition that will be contained in the 3 wt% to 25 wt% or less with respect to the kneading under conditions in which the temperature of the resin composition is 220 ° C. or less,
A second step of molding the kneaded body obtained in the first step to obtain a resin molded body;
The manufacturing method of the resin molding characterized by comprising. The second step is a step of obtaining a resin molded body in which the molecular weight distribution of the aliphatic polyester and the second polymer compound in the resin molded body satisfies a condition represented by the following formula (1). The method for producing a resin molded body according to claim 11, wherein
Mw (1) / Mn (1) ≧ Mw (2) / Mn (2) (1)
[In formula (1), Mw (1) and Mn (1) represent the weight average molecular weight and number average molecular weight of the aliphatic polyester, respectively, and Mw (2) and Mn (2) represent the second polymer, respectively. The weight average molecular weight and number average molecular weight of a compound are shown. ] The method for producing a resin molded body according to claim 11 or 12 , wherein the second step is a step of performing injection molding under a condition that the temperature of the kneaded body in an injection molding machine is 220 ° C or lower.