JPH07278420A - Polyester resin composition - Google Patents

Abstract

PURPOSE:To obtain a polyester resin composition of a low combustion calorie which can give a molding excellent in an balance among rigidity, strengths and impact resistance and good slip on film. CONSTITUTION:This resin composition is the one for a one-way container comprising 40-82wt.% polyethylene terephthalate, 16-50wt.% powdery inorganic filler, and 2-20wt.% vinyl-monomer-grafted rubber copolymer having a rubber content of 50-90wt.% whose base is a rubber selected from between a diene rubber and an acrylic rubber.

Description

Detailed Description of the Invention

[0001]

The present invention relates to a polyester resin composition containing a powdered inorganic filler, which has excellent impact resistance and can be incinerated with a burning calorie equivalent to or less than that of paper in incineration treatment, and It relates to a molded article using this. More specifically, one-way containers for food such as trays and bento containers, in-divider containers, insole containers, and mess (locking)
The present invention relates to a polyester resin composition which is useful in a field requiring rigidity and impact resistance and suitability for incineration, such as a container in a packaging material, and a food container and a container in a packaging material molded by using the polyester resin composition.

[0002]

2. Description of the Related Art Non-crystalline or low crystalline so-called amorphous-polyethylene terephthalate (A-PET)
Is a resin having good solvent resistance, thermoformability, etc., but is insufficient in strength, particularly rigidity, by itself depending on the application. Therefore, for the purpose of improving the strength, a method of filling a powdery inorganic filler has been proposed.

When a large amount of powdered inorganic filler is filled, A-
Although the rigidity and strength of PET increase, on the other hand, there is a problem that impact resistance is significantly reduced and only an insufficient product can be obtained. Conventionally, even if a powdered inorganic filler is added, its addition The amount remains at most under 15% by weight. However, with this, the A-PET composition still has a burning calorie of 4700 cal / g or more, and the purpose of suppressing the heat generation below the paper and giving the burning suitability cannot be achieved.

[0004]

The market for thermoformed products of polyester resin sheets has been expanding recently. Polyester resins have excellent physical properties such as solvent resistance and thermoformability, but on the other hand, they have problems such as insufficient rigidity, easy blocking, and poor lap film sliding suitability. For this reason, in order to obtain a molded product that is satisfactory in strength, it is necessary to increase the material thickness and, for slipperiness, surface-treat with an oil agent such as silicone oil, but this increases the cost of the product. To do.

Under these circumstances, it has been desired to develop a method of improving the rigidity and the slipperiness of a thermoformed polyester resin sheet without increasing the cost. Further, in recent years, due to global environmental problems, there is an increasing demand for resource-saving, energy-saving, and low-combustion calorie thermoformed products.

Even in the one-way food container industry, many synthetic resin products are mass produced and consumed in large quantities.
On the other hand, although the waste incineration capacity is improved, more waste is discharged, so it is treated as landfill without being incinerated, and securing a landfill disposal site has become a social issue today. It is considered that one of the reasons is that the increase in the mixing ratio of plastic products resulted in higher calorific value of garbage and a decrease in the relative incineration capacity of incinerators. In addition, since synthetic resins generally generate high calorie heat during combustion, there is a problem that the waste incinerator is often damaged during the incineration of the waste, and the low calorie equivalent to that of paper or less is required. Development of resin is strongly desired. In order to solve these various problems, it was attempted to add a powdery inorganic filler to the polyester resin at a high concentration, but the impact resistance of the composition after addition was extremely reduced, and a general food product was used. About 50% or less of high-impact polystyrene for containers,
The result is that the performance required as a food container cannot be satisfied due to frequent cracking during transportation.

[0007] Thus, the main object of the present invention is to provide the polyester resin with impact resistance strength lowered to a level not suitable for practical use by blending the polyester resin with a powdery inorganic filler at a high concentration, and other desirable performances. It is to provide a technology for improving the practical level without impairing the above.

[0008]

Means for Solving the Problems As a result of intensive studies aimed at achieving the above object, the present inventors have found that a specific graft-modified rubber copolymer was added to a polyester resin highly filled with a powdery inorganic filler. When blended in a specified amount, the impact resistance, rigidity and slipperiness are significantly improved without lowering the inherent oil resistance, solvent resistance, thermoformability, etc. of the polyester resin, and low burning calories are also achieved. The inventors have found that they have been achieved and have completed the present invention.

Thus, the present invention provides a rubber selected from (a) polyethylene terephthalate resin 40 to 82% by weight, (b) powdered inorganic filler 16 to 50% by weight, and (c) diene rubber and acrylic rubber. The present invention provides a polyester resin composition for molding a one-way container, which comprises 2 to 20% by weight of a vinyl-based monomer-grafted rubber copolymer having a rubber content of 50 to 90% by weight as a base. Hereinafter, the polyester resin composition of the present invention will be described in more detail.

(A) Polyethylene terephthalate resin :
In the present specification, "polyethylene terephthalate resin"
The term (hereinafter referred to as PET resin) means not only PET homopolymer but also 20 mol% or less, preferably 10 mol% or less of the dicarboxylic acid component of PET is substituted with a carboxylic acid component other than terephthalic acid and / or glycol. A crystalline thermoplastic PET copolymer in which 20 mol% or less, preferably 10 mol% or less of the component is substituted with an alcohol component other than ethylene glycol is also used.

In the PET copolymer, examples of the carboxylic acid component other than terephthalic acid include naphthalene-2,6-dicarboxylic acid, isophthalic acid, diphenyldicarboxylic acid, diphenoxyethanedicarboxylic acid, diphenyletherdicarboxylic acid. , Diphenyl sulfone dicarboxylic acid, hexahydrodicarboxylic acid, hexahydroisophthalic acid, adipic acid, sebacic acid, p-β
-Hydroxyethoxybenzoic acid, aromatic, alicyclic or aliphatic bifunctional carboxylic acids such as ε-oxycaproic acid, and the like, and examples of alcohol components other than ethylene glycol include diethylene glycol and triethylene glycol. , Polyethylene glycol, propylene glycol, 1,4-butanediol, neopentyl glycol, hexamethyl glycol, decane methylene glycol, 1,4-hexanedimethanol, 2,2
-Bis (4'-β-hydroxyethoxyphenyl) propane, bis (4'-β-hydroxyethoxyphenyl)
Examples thereof include sulfonic acid. The PET resin (a) used in the present invention may further contain a small amount of a polyfunctional carboxylic acid component and / or alcohol component as long as the linearity is maintained in the molecular structure. Good.

Further, the PET resin (a) used in the present invention
Usually has an intrinsic viscosity (IV) of 0.5 to 1.0 dl / g when measured at 20 ° C. in a 1,1,2,2-tetrachloroethane / phenol (weight ratio 40/60) mixed solvent.
It is particularly preferably within the range of 0.6 to 0.9 dl / g.

In the present invention, it is generally preferable to use the PET homopolymer having the above-mentioned physical properties in terms of cost and manifestation of the effect intended by the present invention.

(B) Inorganic filler in powder form : In the present invention, as the inorganic filler (b), an inorganic solid powder usually used as an additive for resin can be used,
Examples thereof include talc, calcium carbonate, mica, aluminum hydroxide, barium sulfate, calcium sulfate, titanium oxide and the like. These may be used alone or in combination of two or more.

As these inorganic fillers, from the viewpoint of the degree of rigidity improving effect, appearance in food use, hygiene, etc.
Of these, talc is preferable.

The powdered inorganic filler used in the present invention generally has an average particle size of 0.1 to 50 microns, especially 1
Those in the range of ~ 15 microns are suitable.

(C) Vinyl Monomer Graft Rubber Copolymer
Coalescence : A vinyl monomer graft rubber copolymer (hereinafter referred to as a graft rubber copolymer) is a component that plays a role as a reinforcing agent for a PET resin containing a powdered inorganic filler, and is a diene rubber or an acrylic rubber. Based on a rubber selected from the above, a product obtained by grafting a vinyl-based monomer to this is used.

The diene rubber used as a base in this graft rubber copolymer includes diene monomers such as butadiene, isoprene, chloroprene,
Elastomers containing 50% by weight or more, preferably 70% by weight or more, and more preferably 85% by weight or more of units derived from 2,3-dimethylbutadiene and the like are included. Specifically, butadiene rubber (polybutadiene) styrene-
Butadiene copolymer rubber (SBR), acrylonitrile-
Examples thereof include butadiene copolymer rubber (NBR) and butadiene-acrylic copolymer rubber. Among them, SBR having a content of butadiene rubber and butadiene unit of at least 70% by weight, particularly 85% by weight or more is preferable.

Acrylic rubbers include acrylic monomers such as methyl acrylate, ethyl acrylate,
An elastomer containing 50% by weight or more, preferably 70% by weight or more, and more preferably 85% by weight or more of a unit derived from an alkyl acrylate such as propyl acrylate, butyl acrylate, octyl acrylate, etc. Specifically, butyl acrylate rubber containing 70 wt% or more of butyl acrylate units, n-octyl acrylate rubber containing 70 wt% or more of n-octyl acrylate units, and 70 wt% or more of 2-ethylhexyl acrylate units 2- Examples thereof include ethylhexyl acrylate rubber and acrylic-diene copolymer rubber, and among them, butyl acrylate rubber is preferable.

The above-mentioned diene rubber and acrylic rubber may be used alone or in combination of two or more.

The vinyl monomer to be grafted to the diene rubber and acrylic rubber is a compound having one radically polymerizable vinylic unsaturated bond in one molecule, such as methyl (meth) acrylate, ( meth) C ₁ -C ₈ alkyl esters of (meth) acrylic acid such as ethyl acrylate; styrene, alpha-methyl styrene, vinyl aromatic compounds such as vinyl toluene; such as (meth) acrylonitrile; (meth) acrylic acid Examples thereof include vinyl cyanide; (meth) acrylic acid amides such as (meth) acrylamide; carboxylic acid vinyl esters such as vinyl acetate and vinyl propionate. These may be used alone or in combination of two or more. it can.

The graft copolymerization of these vinyl monomers onto the above-mentioned rubber substrate can be carried out by a method known per se, for example, bulk polymerization, solution polymerization, bulk suspension polymerization, suspension polymerization, emulsion polymerization and the like. .

The content of the diene rubber or acrylic rubber in the obtained graft rubber copolymer is 50 to 90.
The amount can be in the range of 60% by weight, preferably 60-80% by weight, more preferably 70-85% by weight.

The graft rubber copolymer which can be preferably used in the present invention is, for example, (1) methyl methacrylate or methacrylic acid based on butadiene and having a butadiene content of 65 to 85% by weight. Methyl acid and styrene (monomer weight ratio: 40)
/ 60 to 90/10) grafted rubber copolymer; (2) Based on a styrene-butadiene copolymer rubber having a butadiene unit content of 70 to 95% by weight and having a copolymer rubber content of 50. To 80% by weight of methyl methacrylate or a rubber copolymer grafted with methyl methacrylate and styrene (monomer weight ratio: 40/60 to 90/10); (3) Content of butyl acrylate unit is 70 to Examples thereof include a rubber copolymer grafted with methyl methacrylate, which is based on 95 wt% of butyl acrylate rubber and has a rubber content of 75 to 95 wt%.

Polyester resin composition : The resin composition of the present invention basically comprises the above-mentioned PET resin (a),
It is composed of three components, a powdered inorganic filler (b) and a graft rubber copolymer (c), and the mixing ratio of these three components can be in the range shown below based on the weight of the composition. .

Blending ratio (wt%) Component General range Suitable range Optimum range PET resin (a) 40-82 45-77 50-71 Powdered inorganic filler (b) 16-50 20-45 25-40 Graft rubber Copolymer (c) 2 to 20 3 to 15 4 to 10 When the burning calorie is the same as or less than that of paper, the minimum blending amount (W) of the powdery inorganic filler (b) is
It is desirable that _F ) satisfy the following formula.

[0027] _{Q P ≧ Q PET × W PET} + Q F × W F + Q R × W R W F = 1-W PET -W R Q P: paper of burning calories, depending on the type 4100-4
600 cal / g, generally 4400 cal / g Q _PET : Burned calories of polyethylene terephthalate Generally, 5500 cal / g Q _F : Burned calories of powdered inorganic filler, 0 cal /
g Q _R : Burning calorie of graft rubber copolymer 6000-9500 cal / g depending on the composition W _PET : Blending ratio of polyethylene terephthalate resin, 0.4 ≦ W _PET ≦ 0.82 W _F : Blending ratio of powdered inorganic filler W _R : Blending ratio of graft rubber copolymer, 0.02 ≦ W _R ≦ 0.20 Further, the resin composition of the present invention contains other thermoplastic resin within a range not departing from the gist of the present invention. If desired, various additives usually used in thermoplastic resins such as colorants, lubricants, plasticizers, antioxidants, and ultraviolet absorbers may be added.

The resin composition of the present invention described above can be melt-kneaded by a method known per se to be molded into a desired shape. For example, the PET resin, the powdered inorganic filler and the graft rubber copolymer described above are uniformly mixed with an additive as described above using a stirrer such as a tumbler or a Henschel mixer, and then vented. It can be melted and kneaded with an attached extruder or the like, and can be formed into a sheet using a T die. The sheet molded in this manner is further vacuum molded, vacuum pressure molded, hot plate pressure molded, food container such as lunch box, cup or the like by a method such as plug assist molding, a partition container, an insole container, It can be formed into a container in a packaging material such as a gut (lock). The resin composition of the present invention contains a powdery inorganic filler at a high concentration,
Not only can the amount of ET resin used be small and the calorie burned per weight can be made equal to or less than that of paper, but a molded product such as a sheet, a food container, a container in a packaging material, or the like molded from the composition. Has an excellent balance of rigidity, strength and impact resistance, and can be made thinner than a molded product of PET resin alone, and exhibits excellent combustion suitability at the same time as saving resources and energy.

Therefore, the resin composition of the present invention is a tray,
It is extremely suitable for forming one-way food containers such as bento containers and cups, as well as containers for partitioning containers, insole containers, containers for packaging materials such as mess (locking), and the like.

[0030]

EXAMPLES The present invention will be described in more detail with reference to the following examples.
However, the present invention is not limited to these examples.
Not of. In addition, it is used in Examples and Comparative Examples.
Evaluation and measurement of physical properties of raw materials and molded products (sheets and containers)
The standard method is as follows. material : (A) Polyethylene terephthalate resin ... Belpet
TK-4 (manufactured by Kanebo Co., Ltd.) Intrinsic viscosity [η] 0.70 dl / g (b) Inorganic filler in powder form ... Talc FVS (Wandou Ko)
Industry Co., Ltd.) ・ Average particle size 8 μm (c) Graft rubber copolymer Graft rubber copolymer (A) ...
Methyl acrylate or methyl methacrylate and styrene
Copolymer grafted with butadiene rubber content 80% by weight;
Grafting Examples 1 to 4: Paraloid EXL-2602 (Kureha Chemical
Industrial Co., Ltd.)-Butadiene rubber content 75% by weight;
And styrene (monomer weight ratio = 52:48)
Example 5: Kane Ace M-511 (Kanebuchi Chemical Industry Co., Ltd.
・ Compound) ・ Butadiene rubber content 70% by weight;
And styrene (monomer weight ratio = 52:48)
Example 6: Metabrene C-223S (Mitsubishi Rayon Co., Ltd.)
Company made) Graft rubber copolymer (B) ... Styrene-butadiene copolymer
Graph of Polymeric Rubber with Methyl Methacrylate and Styrene
Rubber copolymer-styrene-butadiene copolymer rubber content 70% by weight;
Methyl methacrylate and styrene (monomer weight ratio = 5)
0:50) Example 7: Kane Ace B-52 (Kanefuchi Chemical Industry Co., Ltd.)
Styrene-butadiene copolymer rubber content 60% by weight;
Methyl methacrylate and styrene (monomer weight ratio = 5)
Grafting 0:50) Example 8: Kane Ace B-28 (Kanefuchi Chemical Industry Co., Ltd.)
Graft rubber copolymer (C) ... Butyl acrylate rubber
Copolymer grafted with methyl methacrylate-Butyl acrylate rubber content 80% by weight;
Grafting with methyl acetate Examples 9 to 10: Paraloid EXL-2315 (Kureha-ka)
Gaku Kogyo Co., Ltd.)-Butyl acrylate rubber content 85% by weight; methacrylic acid
Grafting Methyl Acidate Example 11: Kaneace FM-20 (Kanefuchi Chemical Industry Co., Ltd.)
Company made) Graft rubber copolymer (D) ... Styrene-butadiene copolymer
Grafting acrylonitrile and styrene onto polymer rubber
Rubber copolymer-styrene-butadiene copolymer rubber content 50% by weight;
Acrylonitrile and styrene (monomer weight ratio = 5)
0:50) Example 12: CB-504 (Monsanto Kasei Kogyo Co., Ltd.)
Company prototype)Evaluation and measurement methods of physical properties : (1) Intrinsic viscosity (IV) 1,1,2,2-tetrachloroethane / phenol = 4
Dissolve the sample in a 0/60 mixed solvent and use an Ubbelohde viscometer.
It was measured at 20 ° C.

(2) Tensile Elastic Modulus The tensile elastic modulus is used to evaluate the rigidity of the sheet. (AS
TM D882) Shimadzu Corporation: Autograph AGS-500S is used.

(3) Impact test A drop ball impact test and a DuPont impact test are used to evaluate the impact resistance of the sheet and the container. (Calculated according to the general rule of JIS K7211 Hard Plastic Drop Weight Impact Test Method.) Falling ball impact: 50% breaking energy (E ₅₀ ) is used.

(A ball diameter of 2 inches and a ball weight of 535 g are used.) DuPont impact: A 50% breaking height (H ₅₀ ) is used.

(A hammering radius of 6.3 mm and a weight of 180 g are used.) (4) Combustion heat quantity The combustion heat quantity of the sheet was measured by the Shimadzu-Thermaken type automatic cylinder calorimeter method.

Shimadzu Corp .: A thermal lab type automatic cylinder calorimeter CA-4P type is used.

(5) Waist / Bending Strength The waist strength (see FIG. 1) and the bending strength (see FIG. 2) are used to evaluate the rigidity of the container.

Shimadzu Corporation: Autograph AGS-5
00S is used. However, the head speed is 50 mm
/ Min.

(6) Sliding property of wrap The opening of the container is placed on a smooth plate on which a soft vinyl chloride resin wrap film (polymer wrap FAV-300 manufactured by Shin-Etsu Polymer Co., Ltd.) is fixed, and 500 g of The load was applied (see FIG. 3), and the stress at the beginning of movement when pulled in the longitudinal direction was used to determine the slipperiness of the wrap.

Shimadzu Corporation: Autograph AGS-5
00S is used. However, the head speed is 200m
It was set to m / min.

Examples 1 to 6 A tandem extruder in which a 35 mm twin screw extruder (TEM-35, two vent type) manufactured by Toshiba Machine with a side feeder (T-21) manufactured by K-TRON and a 45 mm single screw extruder are arranged in series. The polyethylene terephthalate resin is fed in a quantitative feeder from the side feeder with a mixture of the powdered inorganic filler and the graft rubber copolymer (A), and after degassing with a vent, a 0.35 mm sheet is produced by the T-die method. It was created. Further, the sheet was molded into a food tray having a length of 18 cm, a width of 12 cm and a depth of 2.5 cm by a single heating plate pressure air molding machine and subjected to a strength test and a DuPont impact test. Table 1 below shows the measurement results of the mixing ratio of the raw materials and the physical properties of the sheet and the container.

As is clear from Table 1, the sheet exhibited a sufficiently high impact strength despite the high tensile modulus. Further, the above tray was higher than the PET tray of the same material thickness (Comparative Example 1) and showed sufficiently high practical strength, and exhibited high resistance against deformation and impact force. Further, the tray has sufficient slipperiness with respect to the wrap film, and the automatic wrapping machine (AW-2600 manufactured by Teraoka Seiko
AT) was applicable.

The impact resistance E ₅₀ of a high-impact polystyrene sheet having a thickness of 0.35 mm for a general food container is 4
J, the impact resistance H ₅₀ of the container is about 40 cm, and the impact resistance is reduced by 20 to 30% (E ₅₀ = 3.5 to 3.OJ,
H ₅₀ = about 35 to 30 cm) and the frequent occurrence of cracks during transportation makes it impossible to satisfy the required performance as a food container.
This also shows that the tray obtained in this example is sufficiently practical. Examples 7 to 8 Sheets and containers were prepared in the same manner as in Example 1 except that the graft rubber copolymer (A) used in Examples 1 to 6 was replaced with the graft rubber copolymer (B). Was created. Table 1 below shows the measurement results of the mixing ratio of the raw materials and the physical properties of the sheet and the container. As can be seen from Table 1, the molded tray has a good rigidity, despite its high rigidity, has a good balance of physical properties, and has sufficient slipperiness with respect to the wrap film. It was applicable to the packaging machine.

Comparative Example 1 Polyester terephthalate resin was fed to the same tandem extruder used in Example 1 by a quantitative feeder and nothing was fed from the side feeder, and the polyester resin was prepared in the same manner as in Example 1. A single sheet was prepared, and the physical properties of the sheet and the molded product were evaluated and measured in the same manner as in Example 1. Table 1 shows the measurement results of physical properties and the like. The created sheet has excellent impact resistance, but lacks rigidity, the molded tray is easily bent, and the slipperiness with the wrap film is poor, and the wrap film is wrapped with an automatic wrapping machine. I couldn't.

Comparative Example 2 In Example 1, the graft rubber copolymer was not used,
A sheet and a container were molded in the same manner as in Example 1 except that the polyethylene terephthalate resin was 70% by weight and the powdered inorganic filler was 30% by weight. The measurement results of the physical properties of the molded sheet and container are shown in Table 1 below. First
As shown in the table, the molded product has improved rigidity and slipperiness of the wrap, but its impact resistance is extremely lowered, and it cannot be used as a food tray. The tray was damaged during packaging with the automatic packaging machine and could not be packaged. Comparative Example 3 In Example 1, without using the graft rubber copolymer,
A sheet and a container were molded in the same manner as in Example 1 except that the polyethylene terephthalate resin was 60% by weight and the powdered inorganic filler was 40% by weight. The measurement results of the physical properties of the obtained sheet and container are shown in Table 1 below. As shown in Table 1, the molded product has improved rigidity and slipperiness of the wrap, but its impact resistance is extremely reduced, and it cannot be used as a food tray. The tray was damaged during packaging with the automatic packaging machine and could not be packaged.

Examples 9 to 11 In the same manner as in Example 1 except that the graft rubber copolymer (B) used in Examples 7 to 8 was replaced with the graft rubber copolymer (C). Sheets and containers were molded. Table 2 below shows the measurement results of the blending ratio of the raw materials and the physical properties of the molded product. The molded product showed high rigidity and extremely high impact resistance, and a tray with high practicability was obtained.

Example 12 Graft rubber copolymer (C) used in Examples 9 to 11
A sheet and a container were molded in the same manner as in Example 1 except that the graft rubber copolymer (D) was used instead of the above. Table 2 shows the measurement results of the blending ratio of the raw materials and the physical properties of the molded product. The molded product showed high rigidity and reasonable impact resistance, and a tray with a good balance of physical properties was obtained.

[0047]

As described above in detail, the polyester resin composition of the present invention comprises a polyethylene terephthalate resin and a powdered inorganic filler and a graft rubber copolymer, and has rigidity, strength and strength. A resin composition having an excellent balance of impact resistance. Molded articles using such a polyester resin composition of the present invention have good slipperiness with a film, and are also one-way containers of various environmentally friendly resources such as resource saving, energy saving, low burning calories, and packaging materials. In particular, it is particularly suitable as a food container such as a food tray or a bento container, an inner partition container, an insole container, and a container for packaging material such as a mess (locking).

[0048]

[Table 1]

[0049]

[Table 2]

[Brief description of drawings]

FIG. 1 is a schematic view showing a waist strength measuring method for evaluating the rigidity of a container.

FIG. 2 is a schematic diagram showing a method of measuring bending strength for evaluating the rigidity of a container.

FIG. 3 is a schematic diagram showing a method for measuring the slipperiness of a lap.

─────────────────────────────────────────────────── ─── Continuation of the front page (51) Int.Cl. ⁶ Identification code Office reference number FI technical display area C08L 51:00)

Claims (8)

[Claims] 1. Based on (a) a polyethylene terephthalate resin of 40 to 82% by weight, (b) a powdered inorganic filler of 16 to 50% by weight, and (c) a rubber selected from a diene rubber and an acrylic rubber. Content of the rubber is 50 to 90% by weight
Vinyl-based monomer-grafted rubber copolymer 2-20
A polyester resin composition for forming a one-way container, which comprises 10% by weight. 2. The diene rubber comprises a butadiene rubber or a butadiene unit content of at least 70% by weight, in particular 85.
The composition of claim 1 which is a styrene-butadiene copolymer rubber in an amount of at least wt%. 3. The composition according to claim 1, wherein the acrylic rubber is butyl acrylate rubber. 4. The content of the base rubber in the vinyl monomer graft rubber copolymer (c) is 70 to 85% by weight.
The composition of claim 1 which is 5. A rubber copolymer grafted with methyl methacrylate or methyl methacrylate and styrene, wherein the vinyl monomer graft rubber copolymer is based on butadiene and has a butadiene content of 65 to 85% by weight. Grafted with methyl methacrylate or methyl methacrylate and styrene based on a styrene-butadiene copolymer rubber having a butadiene unit content of 70 to 95% by weight and having a copolymer rubber content of 50 to 80% by weight. 2. The composition according to claim 1, which is a rubber copolymer based on butyl acrylate rubber and having a rubber content of 75 to 90% by weight and grafted with methyl methacrylate. 6. The composition according to claim 1, wherein the powdered inorganic filler (b) is talc. 7. A polyethylene terephthalate resin (45 to 77% by weight), (b) a powdered inorganic filler (20 to 45% by weight), and (c) a vinyl monomer graft rubber copolymer (3 to 15).
The composition of claim 1 which comprises by weight. 8. A one-way food container or packaging inner container molded using the composition of claim 1.