JP5135814B2 - Poly-3-hydroxybutyrate polymer composition and tray comprising the same - Google Patents

Description

  The present invention relates to a poly-3-hydroxybutyrate polymer composition excellent in impact resistance, heat resistance and thermoformability, and a tray comprising the same.

  Since plant-derived poly 3-hydroxybutyrate polymers are obtained from plants as raw materials, they have recently attracted attention as materials with little environmental impact. However, the poly-3-hydroxybutyrate-based polymer is limited in use as a container typified by a tray or the like because uneven thickness and defective release occur at the time of thermoforming, or it is inferior in impact resistance.

  Therefore, a biodegradable container in which a polybutylene succinate copolymer and calcium carbonate are blended with a poly-3-hydroxybutyrate-based polymer has been proposed (see, for example, Patent Document 1). Further, in order to improve the impact resistance of the poly-3-hydroxybutyrate polymer, mixing with a specific thermoplastic polyurethane has been proposed (for example, see Patent Document 2).

Japanese Patent Laid-Open No. 2001-341771 JP 2006-137854 A

  However, since the biodegradable container proposed in Patent Document 1 is inferior in impact resistance, for example, when used as a food tray, there is a problem that fragments are mixed into food. Moreover, although the resin composition proposed in Patent Document 2 is excellent in impact resistance, it is inferior in vacuum formability and has a problem in workability when it is used as a container represented by a tray or the like.

  As a result of intensive studies to solve the above problems, the present inventors have found that a poly-3-hydroxybutyrate polymer composition obtained by adding a specific additive to a poly-3-hydroxybutyrate polymer has impact resistance, It has been found that it is excellent in heat resistance and thermoformability and can be developed as various containers, and the present invention has been completed.

That is, the present invention provides a poly selected from poly 3-hydroxybutyrate homopolymer, 3-hydroxybutyrate / 3-hydroxyvalerate copolymer, 3-hydroxybutyrate / 4-hydroxybutyrate copolymer. 5 to 40 parts by weight of talc selected from epoxy surface-treated talc and silane coupling agent surface-treated talc, 10 to 55 parts by weight of thermoplastic polyurethane and weight average molecular weight with respect to 100 parts by weight of 3-hydroxybutyrate polymer (0.03 wt% tetrahydrofuran solution, polystyrene conversion value by gel permeation chromatography under the condition of 38 ° C.) from 3 to 12 parts by weight of methyl methacrylate-alkyl acrylate copolymer of 0.5 × 10 ⁶ or more Poly 3-hydroxybutyrate polymer composition and the same It relates to become tray.

  The present invention is described in detail below.

  The poly-3-hydroxybutyrate polymer used in the present invention may be any polymer as long as it belongs to the category of poly-3-hydroxybutyrate polymer. For example, poly-3-hydroxybutyrate homopolymer, 3- And hydroxyalkanoate copolymers other than 3-hydroxybutyrate. Examples of hydroxyalkanoates other than 3-hydroxybutyrate in the case of copolymers include 3-hydroxypropionate. 3-hydroxyvalerate, 3-hydroxyhexanoate, 3-hydroxyheptanoate, 3-hydroxyoctanoate, 3-hydroxynonanoate, 3-hydroxydecanoate, 3-hydroxyundecanoate, 4- Hydroxybutyrate, hydroxylaurate It is. Among them, since it becomes a poly-3-hydroxybutyrate-based polymer composition having excellent heat resistance, poly-3-hydroxybutyrate homopolymer, 3-hydroxybutyrate / 3-hydroxyvalerate copolymer, 3-hydroxybutyrate A rate / 4-hydroxybutyrate copolymer is preferred. The amount of the copolymer component of the hydroxyalkanoate other than 3-hydroxybutyrate in the poly-3-hydroxybutyrate polymer is preferably 0 to 20 mol%, more preferably 0 to 10 mol%. preferable.

  The melting point of the poly-3-hydroxybutyrate polymer used in the present invention is preferably 160 to 190 ° C., particularly 165 to 165, because it becomes a poly-3-hydroxybutyrate polymer composition particularly excellent in heat resistance. It is preferable that it is 180 degreeC.

  Further, since the poly-3-hydroxybutyrate polymer used in the present invention is a poly-3-hydroxybutyrate polymer composition having excellent mechanical strength and molding processability, it is dissolved in chloroform, gel permeate. It is preferable that the weight average molecular weight of the standard polystyrene conversion measured by the anation chromatography (henceforth GPC) is 100,000-3 million, and it is especially preferable that it is 120,000-1000000.

  The poly 3-hydroxybutyrate polymer can be obtained as a commercial product. Moreover, as the manufacturing method, it can also obtain by the method etc. which are described in the US Patent 4477654, the international publication 94/115519, the US Patent 5502273, etc., for example.

  The talc used in the present invention is not particularly limited, and any talc can be used as long as it belongs to the category of talc. For example, talc rough is pulverized with an impact pulverizer or a micron mill type pulverizer, and further micron mill, jet type is used. A finely pulverized product obtained by pulverization with a pulverizer and classification with a cyclone or micron separator can be used. And since it becomes possible to manufacture the molded object which is excellent in the handleability as a talc, and is excellent in the product external appearance at the time of shape | molding the poly 3-hydroxybutyrate type polymer composition, it is median diameter 0. The talc is preferably 1 to 10 μm, particularly preferably 0.5 to 6 μm.

  Further, talc that has been subjected to surface treatment is preferable because of its excellent dispersibility in poly-3-hydroxybutyrate-based polymers. Examples of the surface treatment material include vinyltriethoxysilane, vinyltris (β-methoxyethoxy). ) Silane coupling agents such as silane, γ-aminopropyltriethoxysilane, γ-glycidoxypropylmethyldiethoxysilane; titanates such as isopropyltrioctanoyl titanate, isopropylisostearoyl diacryl titanate, dicumylphenyloxyacetate titanate Coupling agents; fatty acids such as stearic acid, oleic acid, palmitic acid and their metal salts; aluminum coupling agents; chromium coupling agents; zirconium coupling agents; borane coupling agents; It can gel, particularly an epoxy surface treated talc, a silane coupling agent surface-treated talc preferred.

  The amount of talc added is not limited as long as the object of the present invention can be achieved, and in particular, the crystallization of the poly-3-hydroxybutyrate-based polymer composition becomes faster and has excellent molding processability. Since it is excellent in impact resistance, it is preferably in the range of 1 to 100 parts by weight, particularly 3 to 80 parts by weight, based on 100 parts by weight of the poly-3-hydroxybutyrate polymer. .

  The thermoplastic polyurethane used in the present invention may be any thermoplastic polyurethane as long as it belongs to the category of thermoplastic polyurethane. The thermoplastic polyurethane is generally a block copolymer in which a hard segment and a soft segment are bonded by a urethane bond. is there. Examples of the thermoplastic polyurethane include polyether-based thermoplastic polyurethane, polycarbonate-based thermoplastic polyurethane, polyester-based thermoplastic polyurethane, acrylic-based thermoplastic polyurethane, phenol-resin-based thermoplastic polyurethane, epoxy-based thermoplastic polyurethane, and butadiene-based. Examples include thermoplastic polyurethanes, polyester-polyether thermoplastic polyurethanes, etc. Among them, polyester 3-based thermoplastic polyurethanes or polycarbonate-based thermoplastics are particularly effective because they are poly-3-hydroxybutyrate-based polymer compositions having excellent impact resistance. A plastic polyurethane is preferred. Moreover, as this thermoplastic polyurethane, you may use the commercial item (brand name) milactolan E185 (made by Nippon Miractolan Co., Ltd.) and (brand name) milactolan E190 (made by Japan milactolan Co., Ltd.), for example.

  The amount of the thermoplastic polyurethane added is not limited as long as the object of the present invention can be achieved, and in particular, a poly-3-hydroxybutyrate-based polymer composition having an excellent balance of impact resistance, molding processability, and rigidity. Therefore, it is preferably in the range of 1 to 100 parts by weight, more preferably in the range of 3 to 70 parts by weight, particularly 5 to 60 parts by weight with respect to 100 parts by weight of the poly-3-hydroxybutyrate polymer. The range of parts is preferred.

The methyl methacrylate-alkyl acrylate copolymer used in the present invention is a methyl methacrylate-alkyl acrylate copolymer having a weight average molecular weight of 0.5 × 10 ⁶ or more, and is particularly a poly-3-hydroxybutyrate type having excellent molding processability. Since it becomes a polymer composition, it is preferably a methyl methacrylate-alkyl acrylate copolymer having a weight average molecular weight of 1 × 10 ⁶ or more, more preferably 1.5 × 10 ⁶ or more. In addition, the weight average molecular weight here is a polystyrene conversion value by GPC under the condition of 0.03% by weight tetrahydrofuran solution and 38 ° C.

  The methyl methacrylate-alkyl acrylate copolymer contains a methyl methacrylate residue unit because of its compatibility with the poly-3-hydroxybutyrate polymer and excellent dispersibility in the poly-3-hydroxybutyrate polymer. It is preferable that the amount is 50 to 95% by weight and the content of the alkyl acrylate residue unit is 5 to 50% by weight, and if necessary, a monomer residue copolymerizable with the above two components as a third component Units may be included, and the content thereof is preferably 45% by weight or less.

  The alkyl acrylate residue unit constituting the methyl methacrylate-alkyl acrylate copolymer is preferably an acrylate residue having an alkyl group having 1 to 10 carbon atoms, such as a methyl acrylate residue unit or an ethyl acrylate residue. Units, n-butyl acrylate residue units, isobutyl acrylate residue units, 2-ethylhexyl acrylate residue units, chloroethyl acrylate residue units, etc., and particularly ethyl acrylate residue units and n-butyl acrylate residue units. preferable. In addition, monomer residue units copolymerizable with the above two components contained as the third component as necessary include aromatic vinyl residue units such as styrene residue units; non-residue units such as acrylonitrile residue units. Saturated nitrile residue units; vinyl ester residue units such as vinyl acetate residue units; methacrylate ester residue units other than methyl methacrylate residue units such as n-butyl methacrylate residue units, etc. 1 type (s) or 2 or more types are used. In addition, polyfunctional monomer residue units such as divinylbenzene residue units and ethylene glycol dimethacrylate residue units may be used, but the amount used in this case is preferably 2% by weight or less. Specific examples of the methyl methacrylate-alkyl acrylate copolymer include a methyl methacrylate-ethyl acrylate copolymer and a methyl methacrylate-n-butyl acrylate copolymer.

  Examples of the methyl methacrylate-alkyl acrylate copolymer include JP-A-57-74347, JP-A-50-123761, JP-A-50-123763, JP-B-405311, and JP-B-46. It can be produced by the method described in Japanese Patent No. 1865. Moreover, it is also possible to obtain as a commercial item, such as (trade name) Metabrene P (manufactured by Mitsubishi Rayon Co., Ltd.), (trade name) Kureha Paraloid K-P series (manufactured by Kureha Chemical Industries Ltd.).

  The addition amount of the methyl methacrylate-alkyl acrylate copolymer constituting the poly 3-hydroxybutyrate polymer composition of the present invention is not limited as long as the object of the present invention can be achieved. Among them, thermoformability, Since it becomes a poly-3-hydroxybutyrate polymer composition excellent in dispersibility in the poly-3-hydroxybutyrate polymer, 0.1 to 0.1 part by weight of 100 parts by weight of the poly-3-hydroxybutyrate polymer. The range is preferably 30 parts by weight, more preferably 0.5 to 20 parts by weight, and particularly preferably 1 to 15 parts by weight.

  In addition, a stabilizer may be added to the poly-3-hydroxybutyrate polymer composition of the present invention in order to improve heat resistance, particularly heat discoloration, and examples of the stabilizer include phosphorus compounds and hindered substances. Phenolic compounds, hydroxydioxaphosphin compounds, hydroxy acrylate compounds, sulfur-containing compounds, tin compounds, lactone compounds, hydroxylamine compounds, vitamin E compounds, allylamine compounds, amine-ketone compounds, Aromatic secondary amine compounds, monophenol compounds, bisphenol compounds, polyphenol compounds, benzimidazole compounds, dithiocarbamic acid compounds, thiourea compounds, organic thioacid compounds, and the like. Addition amount is not particularly limited poly 3-hydroxybutyrate To the system 100 parts by weight of the polymer, 0.0001 parts by weight is preferably used.

  Examples of the poly-3-hydroxybutyrate polymer composition of the present invention include dyes, organic pigments, inorganic pigments, inorganic reinforcing agents, plasticizers, ultraviolet absorbers, foaming agents, lubricants, crystal nucleating agents, plasticizers, release agents. Known additives such as molds, hydrolysis inhibitors, antiblocking agents, antistatic agents, antifogging agents, antifungal agents, rustproofing agents, ion trapping agents, flame retardants and flame retardant aids can be added. . Moreover, you may add an inorganic filler and / or an organic filler. In order to improve dispersibility, it is also possible to use a surface-modified inorganic filler. The addition amount of the inorganic filler and / or the organic filler is not particularly limited, but is preferably 0.1 to 100 parts by weight, particularly preferably 3 to 50 parts by weight with respect to 100 parts by weight of the poly-3-hydroxybutyrate polymer.

  Furthermore, thermoplastic elastomers, rubbers, thermoplastic resins, particularly thermoplastic resins called biodegradable resins may be blended.

  As a method for producing the poly-3-hydroxybutyrate polymer composition of the present invention, any method can be used as long as the poly-3-hydroxybutyrate polymer composition of the present invention can be produced. Poly-3-hydroxybutyrate polymer, talc, thermoplastic polyurethane and methyl methacrylate-alkyl acrylate copolymer, and further stabilizers, flame retardants, additives, etc. as necessary, for example, solution mixing, melt mixing, etc. Of these, melt mixing is preferably used because it can be efficiently mixed.

  For melt mixing, for example, a machine such as a Banbury mixer (manufactured by Farrell), a pressure kneader (manufactured by Moriyama Seisakusho), an internal mixer (manufactured by Kurimoto Iron Works), an intensive mixer (manufactured by Nippon Roll Manufacturing Co., Ltd.), etc. A kneading and molding machine used for processing plastics or rubber, such as a pressure kneader; an extrusion molding machine such as a roll molding machine, a single screw extruder, or a twin screw extruder; can be used. The temperature at the time of melt mixing is preferably 120 to 200 ° C, particularly preferably 150 to 190 ° C. In particular, when using an extruder, it is preferable to set the temperature so that the temperature of the molten resin composition discharged from the die of the extruder is 160 ° C. or higher and 185 ° C. or lower.

  The poly-3-hydroxybutyrate polymer composition of the present invention is excellent in impact resistance, heat resistance and thermoformability, and can be used as a molded article for various applications. Since it is excellent, it is suitable to be used as a container represented by a tray.

  There is no particular limitation on the molding method when the poly-3-hydroxybutyrate polymer composition of the present invention is used as a tray, and injection molding, extrusion molding, transfer molding, inflation molding, blow molding, heat molding, compression molding, heat A normal thermoplastic resin molding method such as molding can be used. Among them, since it is excellent in productivity, it is preferable to form a tray by thermoforming after molding a sheet made of the poly-3-hydroxybutyrate polymer composition of the present invention. Examples of the thermoforming method at that time include forming methods such as a free drawing method, a ridge forming method, a plug and ring forming method, a slip forming method, a vacuum forming method, a pressure forming method, and a matched mold forming method. Among these, the vacuum forming method is preferable, and examples of the vacuum forming method include a direct method, a drape forming method, an air slip method, a snap back method, a plug assist method, and an air cushion method.

  The tray made of the poly-3-hydroxybutyrate polymer composition of the present invention can be used as various trays such as a food tray, an electrical component tray, and a mechanical component tray.

  The poly-3-hydroxybutyrate polymer composition of the present invention is excellent in impact resistance, heat resistance, and thermoformability, and comprises various uses, particularly the poly-3-hydroxybutyrate polymer composition. The tray can be adapted in various fields.

  EXAMPLES Hereinafter, although an Example demonstrates this invention in detail, this invention is not limited to these Examples. Commercially available products were used unless otherwise specified.

  The equipment and methods used for evaluation and analysis are shown below.

-Measurement of weight average molecular weight of poly 3-hydroxybutyrate polymer-
The poly 3-hydroxybutyrate-based polymer was measured for molecular weight by GPC using only the dissolved component obtained by dissolving in chloroform at 60 ° C. for 2 hours. In addition, the weight average molecular weight was calculated | required in polystyrene conversion using standard polystyrene (made by Tosoh Corporation). The measurement conditions are shown below.

Model: Product name HLC8020GPC (manufactured by Tosoh Corporation)
Solvent: Chloroform Sample dissolution conditions: 60 ° C, 2 hours Column temperature: 40 ° C
Measurement concentration: 50 mg / 50 mL
Injection volume: 100 μL
Column: Two trade names TSKgel GMHHR-H (manufactured by Tosoh Corporation) -Measurement of weight average molecular weight of methyl methacrylate-alkyl acrylate copolymer-
For GPC measurement, HLC-802A (manufactured by Tosoh Corporation) was used, and two columns of TSK-GEL GMHXL (inner diameter 7.8 mm, length 300 mm, manufactured by Tosoh Corporation) were connected in series, and the column temperature was 38 ° C. The flow rate was 0.9 ml / min, and 0.03% by weight tetrahydrofuran solution was used.

~ Preparation of test piece ~
The test piece used for the evaluation of impact resistance and heat resistance is an injection molding machine (trade name IS100E, manufactured by Toshiba Machine Plastics Co., Ltd.) under the conditions of a nozzle temperature of 175 ° C., an injection time of 10 seconds, and a mold temperature of 60 ° C. Got ready.

  The test piece used for the evaluation of the moldability was a sheet having a thickness of 1 mm, and was prepared using a compression molding machine (manufactured by Shinto Kogyo Co., Ltd., 50t automatic compression molding machine). Molding was performed by heating at 185 ° C. for 5 minutes and then cooling at 40 ° C. for 5 minutes.

~ Measurement method of impact resistance ~
Izod impact strength at 23 ° C. was measured according to ASTM D 256 using a notched Izod test piece obtained by injection molding. The impact was applied from the notch side.

~ Measurement of heat resistance ~
A weighted deflection temperature (hereinafter referred to as HDT) was measured according to JIS K 7191 (Method B) using an injection test piece.

-Evaluation of vacuum formability-
The vacuum forming was performed using a tray mold having a diameter of 10 cm and a depth of 2 cm using a vacuum / pressure forming machine (manufactured by Asano Laboratory).

The moldability was evaluated as follows.
○: Good formability, ×: Poor molding reference example 1
A reactor equipped with a stirrer and a reflux condenser was charged with 280 parts by weight of ion-exchanged water, 1.5 parts by weight of potassium alkenyl succinate, 2 parts by weight of ammonium persulfate, 75 parts by weight of methyl methacrylate, and 25 parts by weight of n-butyl acrylate, After replacing the inside of the reactor with nitrogen, a polymerization reaction was carried out with stirring at a reaction temperature of 65 ° C. and a reaction time of 4 hours to obtain a methyl methacrylate-n-butyl acrylate copolymer.

The obtained methyl acrylate-n-butyl acrylate copolymer had a weight average molecular weight of 4.2 × 10 ⁶ .

Reference example 2
A reactor equipped with a stirrer and a reflux condenser is charged with 280 parts by weight of ion-exchanged water, 1.5 parts by weight of potassium alkenyl succinate, 2 parts by weight of ammonium persulfate, 35 parts by weight of methyl methacrylate, and 0.002 parts by weight of n-octyl mercaptan. After the inside of the reactor was replaced with nitrogen, the polymerization reaction was carried out with stirring at a reaction temperature of 65 ° C. and a reaction time of 4 hours, and further charged with 40 parts by weight of methyl methacrylate and 25 parts by weight of n-butyl acrylate, and stirred. Then, a polymerization reaction was carried out at a reaction temperature of 65 ° C. and a reaction time of 2 hours to obtain a methyl methacrylate-n-butyl acrylate copolymer.

The obtained methyl acrylate-n-butyl acrylate copolymer had a weight average molecular weight of 3.2 × 10 ⁶ Reference Example 3
A reactor equipped with a stirrer and a reflux condenser is charged with 280 parts by weight of ion exchange water, 1.5 parts by weight of potassium alkenyl succinate, 2 parts by weight of ammonium persulfate, 35 parts by weight of methyl methacrylate, and 0.006 parts by weight of n-octyl mercaptan. After the inside of the reactor was replaced with nitrogen, the polymerization reaction was carried out with stirring at a reaction temperature of 65 ° C. and a reaction time of 4 hours, and further charged with 40 parts by weight of methyl methacrylate and 25 parts by weight of n-butyl acrylate, and stirred. Then, a polymerization reaction was carried out at a reaction temperature of 65 ° C. and a reaction time of 2 hours to obtain a methyl methacrylate-n-butyl acrylate copolymer.

The obtained methyl acrylate-n-butyl acrylate copolymer had a weight average molecular weight of 2.0 × 10 ⁶ Reference Example 4
A reactor equipped with a stirrer and a reflux condenser is charged with 280 parts by weight of ion exchange water, 1.5 parts by weight of potassium alkenyl succinate, 2 parts by weight of ammonium persulfate, 35 parts by weight of methyl methacrylate, and 0.01 parts by weight of n-octyl mercaptan. After the inside of the reactor was replaced with nitrogen, the polymerization reaction was carried out with stirring at a reaction temperature of 65 ° C. and a reaction time of 4 hours. Then, a polymerization reaction was carried out at a reaction temperature of 65 ° C. and a reaction time of 2 hours to obtain a methyl methacrylate-n-butyl acrylate copolymer.

The obtained methyl acrylate-n-butyl acrylate copolymer had a weight average molecular weight of 3.1 × 10 ⁵ .

Example 1
Poly-hydroxybutyrate homopolymer (made by Tianan Biological Material, trade name ENMAT200; weight average molecular weight 660000) by 100 parts by weight, talc (made by Nippon Talc Co., Ltd., trade name SG-2000, surface epoxy modification) , 15 parts by weight of median diameter 1.0 μm), 40 parts by weight of thermoplastic polyurethane (trade name Miractolan E185, manufactured by Nippon Milactolan Co., Ltd.), 7 parts by weight of methyl methacrylate-n-butyl acrylate copolymer obtained in Reference Example 1 After dry blending, melt mixing was carried out using a twin-screw extruder (manufactured by Toyo Seiki Seisakusho Co., Ltd., Labo Plast Mill) to obtain poly-3-hydroxybutyrate polymer composition pellets. The melt mixing at that time was performed at a cylinder temperature of 175 ° C., a die temperature of 165 ° C., and a screw rotation speed of 80 rpm.

  The resulting poly-3-hydroxybutyrate polymer composition pellets were used to mold a tray and to evaluate moldability, impact resistance, and heat resistance. The results are shown in Table 1.

Example 2
For 100 parts by weight of 3-hydroxybutyrate / 3-hydroxyvalerate copolymer (manufactured by Tianan Biological Material, trade name ENMAT100, weight average molecular weight 290000), talc (manufactured by Nippon Talc Co., Ltd., trade name P-) 3, surface epoxy modification, 5 parts by weight of median diameter 5.1 μm), 25 parts by weight of thermoplastic polyurethane (manufactured by Nippon Milactolan, trade name Milactolan E190), methyl methacrylate-n-butyl acrylate copolymer obtained by Reference Example 1 After dry blending 3 parts by weight of the coalescence, melt mixing was performed using a twin-screw extruder (manufactured by Toyo Seiki Seisakusho, Labo Plast Mill) to obtain poly-3-hydroxybutyrate polymer composition pellets. The melt mixing at that time was performed at a cylinder temperature of 175 ° C., a die temperature of 165 ° C., and a screw rotation speed of 80 rpm.

  The resulting poly-3-hydroxybutyrate polymer composition pellets were used to mold a tray and to evaluate moldability, impact resistance, and heat resistance. The results are shown in Table 1.

Example 3
Poly-hydroxybutyrate homopolymer (made by Tianan Biological Material, trade name ENMAT200; weight average molecular weight 660000) by 100 parts by weight, talc (made by Nippon Talc Co., Ltd., trade name SG-2000, surface epoxy modification) 5 parts by weight of a median diameter of 1.0 μm), 10 parts by weight of a thermoplastic polyurethane (trade name Milactolan E185 manufactured by Nippon Milactolan Co., Ltd.), and 7 parts by weight of a methyl methacrylate-n-butyl acrylate copolymer obtained in Reference Example 2. After dry blending, melt mixing was carried out using a twin-screw extruder (manufactured by Toyo Seiki Seisakusho Co., Ltd., Labo Plast Mill) to obtain poly-3-hydroxybutyrate polymer composition pellets. The melt mixing at that time was performed at a cylinder temperature of 175 ° C., a die temperature of 165 ° C., and a screw rotation speed of 80 rpm.

  The resulting poly-3-hydroxybutyrate polymer composition pellets were used to mold a tray and to evaluate moldability, impact resistance, and heat resistance. The results are shown in Table 1.

Example 4
Poly-hydroxybutyrate homopolymer (manufactured by Tianan Biological Material, trade name ENMAT200; weight average molecular weight 660000) 100 parts by weight, talc (manufactured by Nippon Talc Co., Ltd., trade name P-3, surface epoxy modification) , 40 parts by weight of median diameter 5.1 μm), 55 parts by weight of thermoplastic polyurethane (trade name Milactolan E185, manufactured by Nippon Milactolan Co., Ltd.), 12 parts by weight of methyl methacrylate-n-butyl acrylate copolymer obtained in Reference Example 3 After dry blending, melt mixing was carried out using a twin-screw extruder (manufactured by Toyo Seiki Seisakusho Co., Ltd., Labo Plast Mill) to obtain poly-3-hydroxybutyrate polymer composition pellets. The melt mixing at that time was performed at a cylinder temperature of 175 ° C., a die temperature of 165 ° C., and a screw rotation speed of 80 rpm.

  The resulting poly-3-hydroxybutyrate polymer composition pellets were used to mold a tray and to evaluate moldability, impact resistance, and heat resistance. The results are shown in Table 1.

Comparative Example 1
Poly-hydroxybutyrate homopolymer (made by Tianan Biological Material, trade name ENMAT200; weight average molecular weight 660000) by 100 parts by weight, talc (made by Nippon Talc Co., Ltd., trade name SG-2000, surface epoxy modification) , 15 parts by weight of the median diameter 1.0 μm) and 7 parts by weight of the methyl methacrylate-n-butyl acrylate copolymer obtained in Reference Example 1 were dry blended, and then a twin screw extruder (manufactured by Toyo Seiki Seisakusho, (Laboplast mill) was used for melt mixing to obtain poly-3-hydroxybutyrate polymer composition pellets. The melt mixing at that time was performed at a cylinder temperature of 175 ° C., a die temperature of 165 ° C., and a screw rotation speed of 80 rpm.

  The obtained poly-3-hydroxybutyrate polymer composition pellets were evaluated for moldability, impact resistance, and heat resistance. The results are shown in Table 1.

  The resulting poly-3-hydroxybutyrate polymer composition was inferior in impact resistance. An attempt was made to form the tray, but it showed a molding failure.

Comparative Example 2
3-hydroxybutyrate / 3-hydroxyvalerate copolymer (manufactured by Tianan Biological Material, trade name ENMAT100, weight average molecular weight 290000) with respect to 100 parts by weight, thermoplastic polyurethane (manufactured by Nippon Milactolan, trade name Milactolan E190) ) After 10 parts by weight and 7 parts by weight of the methyl methacrylate-n-butyl acrylate copolymer obtained in Reference Example 1 were dry-blended, a twin-screw extruder (manufactured by Toyo Seiki Seisakusho, Lab Plast Mill) was used. The mixture was melt-mixed to obtain poly-3-hydroxybutyrate polymer composition pellets. The melt mixing at that time was performed at a cylinder temperature of 175 ° C., a die temperature of 165 ° C., and a screw rotation speed of 80 rpm.

  The obtained poly-3-hydroxybutyrate polymer composition pellets were evaluated for moldability, impact resistance, and heat resistance. The results are shown in Table 1.

  The resulting poly-3-hydroxybutyrate polymer composition was inferior in impact resistance. An attempt was made to form the tray, but it showed a molding failure.

Comparative Example 3
Poly-hydroxybutyrate homopolymer (made by Tianan Biological Material, trade name ENMAT200; weight average molecular weight 660000) by 100 parts by weight, talc (made by Nippon Talc Co., Ltd., trade name SG-2000, surface epoxy modification) , 40 parts by weight of median diameter 1.0 μm), 10 parts by weight of thermoplastic polyurethane (manufactured by Nippon Milactolan, trade name Milactolan E185), 7 parts by weight of methyl methacrylate-n-butyl acrylate copolymer obtained in Reference Example 4 After dry blending, melt mixing was carried out using a twin-screw extruder (manufactured by Toyo Seiki Seisakusho Co., Ltd., Labo Plast Mill) to obtain poly-3-hydroxybutyrate polymer composition pellets. The melt mixing at that time was performed at a cylinder temperature of 175 ° C., a die temperature of 165 ° C., and a screw rotation speed of 80 rpm.

  The obtained poly-3-hydroxybutyrate polymer composition pellets were evaluated for moldability, impact resistance, and heat resistance. The results are shown in Table 1.

  The resulting poly-3-hydroxybutyrate polymer composition was inferior in impact resistance. An attempt was made to form the tray, but it showed a molding failure.

実施例６
実施例１で得られたトレイに水５０ｃｃを入れ、電子レンジで１分間加熱した。取出した容器を観察したところ、外観に変化は無く、十分にトレイとして使用できるものであった。

Example 6
50 cc of water was placed in the tray obtained in Example 1, and heated in a microwave for 1 minute. When the taken out container was observed, there was no change in the external appearance, and it was sufficiently usable as a tray.

Claims (2)

Poly-3-hydroxybutyrate system selected from poly-3-hydroxybutyrate homopolymer, 3-hydroxybutyrate / 3-hydroxyvalerate copolymer, 3-hydroxybutyrate / 4-hydroxybutyrate copolymer 5 to 40 parts by weight of talc having a median diameter of 1.0 to 5.1 μm and 10 to 55 parts by weight of thermoplastic polyurethane selected from epoxy surface-treated talc and silane coupling agent surface-treated talc with respect to 100 parts by weight of the polymer And a methyl methacrylate-alkyl acrylate copolymer 3 having a weight average molecular weight (0.03% by weight tetrahydrofuran solution, converted to polystyrene by gel permeation chromatography under the condition of 38 ° C.) of 0.5 × 10 ⁶ or more. Poly-3-hydroxybutyrate comprising 12 parts by weight System polymer composition. A tray comprising the poly-3-hydroxybutyrate polymer composition according to claim 1.