JPH0578460A - Heat-resistant tableware for oven use - Google Patents

Abstract

PURPOSE:To provide the subject product composed of a specified aromatic polyester, excellent in heat resistance, therefore capable of cooking at high temperatures, excellent in resistance to food pollution, moldability and impact resistance, and so capable of coping with diversification of design or thin walling and lightening. CONSTITUTION:The objective product is obtained by molding an aromatic polyester composed of structural units represented by formula I-V (X is H, 1-4C alkyl, etc.; Ar is divalent group composed of one single aromatic ring or a condensed aromatic ring; Y is O or formula II) respectively in an amount of 40-70mol% unit I, 1-8mol% unit II, 6-36mol% units III+IV and 10-40mol% unit V while satisfying that the molar ratio of [unit III/(units III+IV)] is 0.1-0.8. P-hydroxybenzoic acid, etc., is preferable as the raw material giving the unit I and m-hydroxybenzoic acid, isophthalic acid, etc., are preferable as the raw material of the unit II. Terephthalic acid and 2,6-naphthalenedicarboxylic acid are respectively preferable as the raw materials of the units III and IV and 4,4'-dihydroxybiphenyl, etc., is preferable as the raw material of the unit V.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to heat resistant tableware for ovens, and more particularly to heat resistant tableware for ovens which is excellent in heat resistance, mechanical properties and food stain resistance.

[0002]

2. Description of the Related Art In recent years, tableware has been made of plastics in response to the demands for design diversity and weight reduction.

For example, as plastics used for containers for cooking in microwave ovens and electric ovens,
Polypropylene, polymethylpentene, polysulfone,
Examples thereof include polyethylene terephthalate and unsaturated polyester.

The properties required for these plastics are heat resistance that can withstand the heat used for cooking, mechanical strength that can withstand use, boiling water resistance, food stain resistance, detergent resistance, and hygiene. Etc. However, these plastics have a low limit temperature of use, and few satisfy the thermal properties required for cooking containers used in electric ovens. For example, polypropylene is 10
Since it deforms at 0 ° C or higher, it can be used in a microwave oven, but cannot be used in an oven. Similarly, polysulfone also deforms at 160 ° C. or higher, so that it cannot be used in an oven. Also, polymethylpentene, C
-PET (crystallized PET), unsaturated polyester is 20
Since it deforms at 0 ° C or higher, the use temperature in the oven is limited.

A plastic container that can be used in an oven is disclosed in JP-A-56-43319. The plastic container has heat resistance that can withstand use in an oven, and is also excellent in thermal shock, food stain resistance, detergent resistance, and hygiene.

[0006]

However, as will be described later in Examples of the present invention, any resin having an anisotropic melting property when it has heat resistance to an oven, that is, a liquid crystal polyester, is a drawback of the resin. It has surface peelability and strength anisotropy. For this reason, the surface of the tableware may be peeled off due to friction during cleaning of the dishes, and cracks may easily occur in the resin orientation direction when dropped.

Further, since the melting temperature is high, the molding process is difficult, and since the resin is molded at a high temperature, the resin is easily decomposed or colored.

[0008]

[Means for Solving the Problems] The inventors of the present invention have excellent molding processability for enabling the variety of designs which are the characteristics of plastic containers, and also have excellent impact strength, and can be made thin and lightweight. We have made an intensive search for a resin with excellent heat resistance, heat shock resistance, food stain resistance, detergent resistance, and hygiene, and found that by using a specific aromatic polyester or aromatic polyesteramide, an ideal plastic for oven. Succeeded in obtaining the container.

That is, the present invention, as a first aspect,
Formulas (I), (II), (III), (IV) and (V) below:

[0010]

[Chemical 6]

(Where X is a hydrogen atom, an alkyl group having 1 to 4 carbon atoms, an alkoxy group having 1 to 4 carbon atoms, an aryl group having 6 to 10 carbon atoms or a halogen atom, and , Ar represents at least one monocyclic or condensed aromatic ring, and Y represents —O— or the formula (II-
a):

[0012]

[Chemical 7]

Is a group represented by Is substantially composed of units I, II, III, IV and V, and the content of each unit is unit I 40 to 70 mol% unit II 1 to 8 mol% unit III + unit IV 6 to 36 mol% unit A heat-resistant tableware for oven obtained by molding an aromatic polyester having V of 10 to 40 mol% and a molar ratio of unit III / (unit III + unit IV) of 0.1 to 0.8. Is.

Further, it is preferable to further contain 250 parts by weight or less of an inorganic filler with respect to 100 parts by weight of the aromatic polyester.

As a second aspect of the present invention, the following formulas (I), (II), (III), (IV), (V) and (V
I):

[0016]

[Chemical 8]

(Wherein X represents a hydrogen atom, an alkyl group having 1 to 4 carbon atoms, an alkoxy group having 1 to 4 carbon atoms, an aryl group having 6 to 10 carbon atoms, or a halogen atom, and , Ar represents at least one monocyclic or condensed aromatic ring, and Y represents —O— or the formula (II-
a):

[0018]

[Chemical 9]

Z ₁ is --NH-- and Z ₂ is --NH--, --O-- or formula (VI-a):

[0020]

[Chemical 10]

A unit I represented by the following formula, wherein Z ₁ and Z ₂ are located in the para or meta position relative to each other:
It consists essentially of II, III, IV, V and VI, and the content ratio of each unit is unit I 40 to 70 mol% unit II 1 to 8 mol% unit III + unit IV 6 to 36 mol% unit V 10 to 40 For an oven obtained by molding an aromatic polyesteramide having a mol% unit VI of 0.1 to 10 mol% and a molar ratio of unit III / (unit III + unit IV) of 0.1 to 0.8 It provides heat-resistant tableware.

Further, the aromatic polyesteramide 10
It is preferable to further contain an inorganic filler in an amount of 250 parts by weight or less based on 0 part by weight.

The oven heat-resistant tableware of the present invention will be described in detail below.

The aromatic polyester, which is a molding material for heat-resistant tableware for ovens according to the present invention, has the formula (I), (II),
It essentially consists of units I to V represented by (III), (IV) and (V). This formula (I), (II),
In (III), (IV) and (V), X is a hydrogen atom, an alkyl group having 1 to 4 carbon atoms, or 1 to 4 carbon atoms.
Is an alkoxy group, an aryl group having 6 to 10 carbon atoms, or a halogen atom. Examples of the alkyl group having 1 to 4 carbon atoms include a methyl group, an ethyl group, a propyl group,
Examples thereof include a butyl group and the like, and examples of the alkoxy group having 1 to 4 carbon atoms include a methoxy group, an ethoxy group, a propoxy group, a butoxy group and the like. Further, examples of the aryl group having 6 to 10 carbon atoms include phenyl group and the like, and examples of the halogen atom include fluorine,
Examples thereof include chlorine and bromine. Ar is at least 1
Represents a monocyclic or condensed aromatic ring, for example, p
-Phenylene group, m-phenylene group, 4,4'-biphenylene group, 2,6-naphthylene group, 2,7-naphthylene group, 1,5-naphthylene group and the like. Furthermore, Y
Is -O- or a group represented by the above formula (II-a).

The unit I constituting the aromatic polyester is
It is represented by the above formula (I), and has a structural unit of p-hydroxybenzoic acid as a main skeleton, and its benzene nucleus has the substituent X. This unit I is derived from p-hydroxybenzoic acid or its derivative,
For example, an unsubstituted p-hydroxybenzoic acid, an acetate of p-hydroxybenzoic acid, a propionate, a benzoate, an ester-forming derivative such as methyl, ethyl or phenyl is used as a raw material. Among these, particularly preferred are p-hydroxybenzoic acid and p-acetoxybenzoic acid.

The content of the unit (I) in the aromatic polyester is about 40 to 70 mol%, preferably about 45 to 65 mol%. Unit (I) is less than 40 mol% or 7
When it exceeds 0 mol%, the mechanical strength of the oven-resistant tableware obtained by molding the aromatic polyester is lowered.

Units constituting the aromatic polyester
II is represented by the formula (II), and when the substituent Y is -O-, a structural unit II-i derived from m-hydroxybenzoic acid represented by the following formula (II-i), When the substituent Y is a group represented by the above formula (II-a), a structural unit II-ii derived from isophthalic acid represented by the following formula (II-ii) has a main skeleton. And the benzene nucleus has the substituent X.

[0028]

[Chemical 11]

Examples of the raw material for constituting the unit II-i include m-hydroxybenzoic acid or m-hydroxybenzoic acid acetate, propionate, benzoate, methyl, ethyl and phenyl monoderivatives. Preferably, m-hydroxybenzoic acid and m-
It is acetoxybenzoic acid. In addition, examples of the raw material for forming the unit II-ii include isophthalic acid or a mono- or diester derivative of methyl, ethyl, or phenyl of isophthalic acid. Of these, the most preferred is isophthalic acid. The aromatic polyester used in the present invention, as the unit II,
The unit II-i represented by the formula (II-i) or the unit II-ii represented by the formula (II-ii) may contain one type alone or a combination of two or more types.

The content of the unit II represented by the above formula (II-i) and / or (II-ii) in the aromatic polyether is
It is about 1 to 8 mol%, preferably 2 to 5 mol%. unit
When II is less than 1 mol%, the melting temperature of the aromatic polyester becomes high and molding becomes difficult, and when the unit II exceeds 8%, the heat resistance of the aromatic polyester decreases.

The unit III and the unit IV constituting the aromatic polyester are terephthalic acid or its derivative represented by the above formula (III) and 2,6 represented by the above formula (IV), respectively.
-A structural unit derived from naphthalenedicarboxylic acid or a derivative thereof. As the raw material for constituting the unit III, for example, terephthalic acid or its methyl, ethyl,
Examples include phenyl mono- or diester derivatives,
Terephthalic acid is used for all. Examples of the raw material for constituting the unit IV include 2,6-naphthalenedicarboxylic acid or its methyl, ethyl, phenyl mono- or diester derivatives, and the like. Among these, 2,6-naphthalenedicarboxylic acid Is most preferred.

In the aromatic polyester, the unit III
+ Unit IV content is 6-36 mol%, preferably 12-
27 mol%. When the content of the unit III + unit IV is less than 6 mol%, the melting temperature of the obtained aromatic polyester becomes high and molding becomes difficult, and when the content of the unit III + unit IV exceeds 36 mol%, the aromatic polyester The polyester is likely to be colored and the mechanical strength is reduced.

Also, the molar ratio of the unit III and the unit IV [III /
(III + IV)] is 0.1 to 0.8, preferably about 0.3
~ 0.7. When the molar ratio of the unit III to the unit IV is less than 0.1, the melting temperature of the obtained aromatic polyester becomes high, molding becomes difficult, and the heat resistance decreases,
If it exceeds 0.8, the melting temperature of the aromatic polyester becomes high and molding becomes difficult.

Further, the unit V constituting the aromatic polyester is a structural unit derived from the symmetrical dihydroxy compound represented by the above formula (V), and in the formula (V), Ar is at least one monocyclic ring. Alternatively, it represents a divalent group composed of a condensed aromatic ring. The symmetrical dihydroxy compound which is a raw material for constituting the unit V has a general formula: HO-Ar-
These are represented by OH, and the symmetric dihydroxy compounds include those forming a unit represented by the following formula in a copolyester.

[0035]

[Chemical formula 12]

As the symmetrical dihydroxy compound, for example, hydroquinone, bisphenol A, 4,4'-dihydroxybiphenyl, dihydroxybiphenyl ether, 2,6-dihydroxynaphthalene, etc., or mono- or diesters of these acetates, propionates, benzoates, etc. Examples thereof include derivatives. Among these, particularly preferred compounds are 4,4'-dihydroxybiphenyl, 4,4'-diacetoxybiphenyl and 2,6 '.
-Dihydroxynaphthalene and 2,6-diacetoxynaphthalene.

The content of the unit V in the aromatic polyester is 10 to 40 mol%, preferably 17.5 to 27.5 mol%. When the content of the unit V is less than 10 mol%,
The melting temperature of the polyester becomes high and it is difficult to mold, and when the unit V exceeds 40 mol%, the heat resistance of the polyester decreases, which is not preferable.

The polymerization method for producing the aromatic polyester is not particularly limited, and any polymerization method may be used as long as the units I to V are present in the aromatic polyester in the composition ratio of the present invention. For example, a melt polymerization method in which the hydroxyl group in the raw material is acetylated and then the reaction is performed while removing acetic acid, a melt polymerization method in which the carboxyl group in the raw material is phenyl esterified, and then the reaction is performed while removing phenol, an inert gas A melt polymerization method in which the viscosity is reduced using a solvent,
It can be carried out according to a method such as a solid-phase polymerization method in which polymerization is carried out in a solid state under reduced pressure or an inert gas stream.

Next, the aromatic polyester amide used in the oven heat-resistant tableware of the second aspect of the present invention substantially comprises units I to VI represented by the above formulas (I) to (VI). Of these, the units I to V represented by the formulas (I) to (V) are the same as the aromatic polyester. Therefore, hereinafter, the description of the units IV will be omitted, and the unit VI will be mainly described.

The unit VI is a unit having an anilino group (phenylamino group) and has the following formula (VI):

[Chemical 13] Is represented by. In the formula, Z ₁ is —NH—, and Z ₂ is —NH—, —O— or the formula:

[Chemical 14] Wherein Z ₁ and Z ₂ are located in the para or meta position relative to each other.

As the raw material for constituting the unit VI, for example, p-phenylenediamine, p-phenylenediamine, m-phenylenediamine, p-aminobenzoic acid, m-aminobenzoic acid, 4-aminophenol, 3 −
Aminophenol and derivatives thereof, and the like,
Specific examples of the derivative include N, N'-diacetyl-p.
-Phenylenediamine, N, N'-diacetyl-m-phenylenediamine, p-acetamidobenzoic acid, m-acetamidobenzoic acid, p-acetamidophenylacetate, m-acetamidophenylacetate and the like.

The content of the unit VI in the aromatic polyester amide is 0.1 to the total number of moles of the units I to VI.
It is 10 mol%, preferably 1 to 8 mol%. When the content of the unit VI is less than 0.1 mol%, the relaxation of the anisotropy due to the introduction of an amide group, which is a feature of the present invention, is not sufficient, and when it exceeds 10 mol%, the aromatic polyester amide is Since the melting temperature and the melt viscosity increase, the moldability deteriorates, and the heat resistance and the mechanical strength decrease.

The production of this aromatic polyesteramide is
It can be carried out according to the same method as the method for producing the aromatic polyester.

The aromatic polyester amide used in the present invention relaxes the anisotropy without impairing the characteristics of the above-mentioned aromatic polyester, and has high strength in the direction (TD direction) perpendicular to the orientation direction during melt processing and molding. I have.

The above-mentioned aromatic polyester and / or aromatic polyester amide can be used as it is in the oven heat-resistant tableware of the present invention, but in order to improve the surface releasability and the anisotropy of strength, it is necessary to use an inorganic filler. It is preferable to add a material.

The inorganic filler used in the present invention includes:
As long as it is harmless for tableware and can withstand temperatures of 300 ° C or higher, talc, calcium carbonate,
Examples thereof include inorganic powders such as mica, calcium silicate, kaolin, silica, titanium oxide, barium sulfate, calcium sulfate, magnesium hydroxide and activated clay, and inorganic fibers such as glass fibers, carbon fibers, metal fibers and whiskers.

The inorganic filler used in the present invention is 250 parts by weight or less, preferably 10 to 15 parts by weight based on 100 parts by weight of the aromatic polyester or the aromatic polyesteramide.
0 parts by weight can be blended. When the inorganic filler is blended, if the blending amount exceeds 250 parts by weight, the strength of the obtained oven-resistant tableware is lowered, which is not preferable.

The oven heat-resistant tableware of the present invention also comprises
In addition to the inorganic filler, phenol-based, amine-based, sulfur-based, phosphorus-based antioxidant, hydrazine-based, amide-based metal deactivator, metal soap, metal salt liquid stabilizer, organic tin stabilizer, Antimony stabilizers, epoxy compounds, phosphites, phenol derivatives, stabilizers such as polyhydric alcohols, plasticizers such as phthalates, phosphates, adipates, anti-coloring agents, tetrabromobisphenol A, three A flame retardant such as antimony oxide, a molybdenum disulfide, a silicone oil, a fluororesin, a lubricant such as graphite, and the like may be added.

The heat-resistant tableware for an oven of the present invention comprises the aromatic polyester and, if necessary, the inorganic filler,
Also, it can be obtained by molding a composition containing various additives such as the above-mentioned antioxidant.

The molding method is not particularly limited. For example, an injection molding method in which a molten resin is filled in a mold and cooled to obtain a molded product, and the molten resin is extruded from nozzles of various shapes using an extruder. Extrusion molding method for solidifying and cooling, pressure molding method for pressing and cooling a plate or sheet resin or parison into a mold while heating, vacuum molding method,
Any method used for manufacturing this kind of tableware such as blow molding method and injection blow molding method can be applied,
It can be performed using a mold, a die or the like corresponding to a desired shape.

The molding temperature is usually about 250 to 400 ° C, preferably about 280 to 360 ° C. The molding pressure is usually about 100 to 1500 kg / cm ² .

The shape of the heat-resistant tableware for an oven of the present invention is not particularly limited, and may be any of the shapes generally used as tableware, such as dish, cup, and plate.

The heat-resistant temperature of the oven heat-resistant tableware of the present invention is usually about 200 to 350 ° C.

[0054]

EXAMPLES The present invention will be described in more detail based on the following examples.

Example 1 A polymerization vessel equipped with a torque meter / tachometer stirrer, an argon inlet tube, and a thermometer was charged with p.
-Acetoxybenzoic acid 2203.2 g (12.24 mol), terephthalic acid 328.7 g (1.98 mol), isophthalic acid 29.9 g (0.18 mol), 2,6-naphthalenedicarboxylic acid 155.6 g (0 .72 mol),
777.6 g of 4,4'-diacetoxybiphenyl and 0.5 g of potassium acetate were charged.

After sufficiently replacing the inside of the polymerization vessel with argon, the internal temperature was raised to 260 ° C. over about 30 minutes.
Stirring was started when the raw materials began to melt while the temperature was rising.
Acetic acid started to distill when the internal temperature rose to around 230 ° C. After the temperature was raised to 260 ° C, the temperature was further raised at a rate of 2 ° C / min to reduce the distillation of acetic acid, and then the pressure was gradually reduced, and finally the reaction was carried out at 350 ° C and 0.5 mmHg for 20 minutes. Then, the polymerization was completed to obtain an aromatic polyester.

The obtained aromatic polyester was treated with an injection molding machine (Yamashiro Seiki Seisakusho SAV-60 type) to obtain a diameter of 10
It was molded into a hemispherical tableware having a thickness of 0 mm and a thickness of 5 mm.

(Example 2) Talc (manufactured by Hayashi Kasei Co., Ltd.) was added to 100 parts by weight of the aromatic polyester obtained in Example 1.
The composition obtained by kneading and filling 0 parts by weight was molded into hemispherical tableware in the same manner as in Example 1.

Example 3 A composition obtained by kneading and filling 50 parts by weight of glass fiber (manufactured by Fuji Fiber Glass Co., Ltd.) with 100 parts by weight of the aromatic polyester obtained in Example 1 was used. The same procedure as in 1 was performed to form hemispherical tableware.

Example 4 1614.6 g of p-hydroxybenzoic acid was placed in the same polymerization vessel as used in Example 1.
(11.7 mol), terephthalic acid 239.0 g (1.4
4 mol), 59.8 g of isophthalic acid (0.36 mol),
23,3 g of 2,6-naphthalenedicarboxylic acid (1.0
8 mol) 4,4'-biphenol 535.7 g (2.8
8 mol), p-aminobenzoic acid 74.0 g (0.54 mol), acetic anhydride 2020 g (19.8 mol) and potassium acetate 0.5 g were charged.

After the inside of the polymerization vessel was sufficiently replaced with argon, heating was started and acetylation and amidation reactions were carried out under reflux for 1 hour. Next, while distilling out acetic acid, 3
The temperature was raised to 50 ° C. at a heating rate of 2 ° C./min. After reaching 350 ° C., the pressure was gradually reduced while maintaining the temperature, and polymerization was carried out until a predetermined stirring torque was reached to obtain an aromatic polyesteramide.

The aromatic polyester amide thus obtained was crushed, and the aromatic polyester amide 1 was crushed using a twin-screw extruder.
Potassium titanate whiskers (manufactured by Kawatetsu Mining Co., Ltd.) were mixed and kneaded in a ratio of 30 parts by weight to 00 parts by weight,
A composition was prepared. The obtained composition was molded into hemispherical tableware in the same manner as in Example 1.

Comparative Example 1 p-acetoxybenzoic acid 19
08 g (10.6 mol), 4,4'-diamotoxybiphenyl 945 g (3.5 mol), terephthalic acid 581 g
(3.5 mol) and 0.5 g of potassium acetate were charged,
After the aromatic polyester was synthesized in the same manner as in Example 1 except that the final temperature was 430 ° C., the obtained aromatic polyester was molded into a hemispherical dish.

Comparative Example 2 Polypropylene tableware was used as a comparative example.

(Comparative Example 3) Tableware made of polysulfone was used as a comparative example.

Comparative Example 4 Tableware made of polymethylpentene was used as a comparative example.

(Comparative Example 5) C-PET tableware was used as a comparative example.

Comparative Example 6 Tableware made of unsaturated polyester was used as a comparative example.

The following practicality evaluation tests were carried out on each of the tableware of the above Examples and Comparative Examples.

(A) Thermal Oven Test Tableware was placed in an oven and heated at 250 ° C. The results are shown in Table 1.

(B) Strength Formability Test (1) A tableware was filled with water (about 150 cm ³ ) and dropped onto concrete, and the drop distance until damage was examined. The results are shown in Table 2. Further, the molding temperature and the mold temperature at the time of tableware molding are shown in the same table.

(C) Food stain resistance test Tableware was immersed in various foods kept at 100 ° C., and one week later, the change in the appearance of the tableware was examined. The results are shown in Table 3.

(D) Strength Evaluation Test (2) The resin of each Example was molded into a flat plate of each thickness, and a DuPont impact test (manufactured by Toyo Seiki Seisakusho) was conducted. A weight having a weight of 100 g was used, and the relationship between energy leading to destruction and thickness is shown in FIG. The dotted line in the figure is the tableware JIS standard (JIS B15
01) shows the impact energy.

(A) Thermal oven test

(B) Strength and formability evaluation test

(C) Food contamination resistance test

[0077]

EFFECT OF THE INVENTION The heat-resistant tableware for an oven of the present invention has excellent heat resistance, and therefore can be used for high-temperature cooking in an oven or the like and has excellent food stain resistance. Furthermore, since the resin used in the heat-resistant tableware for ovens of the present invention is excellent in moldability and impact strength, it is possible to cope with diversified designs and reduction in thickness and weight.

[Brief description of drawings]

FIG. 1 is a diagram showing the results of a strength evaluation test in Examples and Comparative Examples.

Continuation of front page (51) Int.Cl. ⁵ Identification number Office reference number FI technical display location C08L 67/00 77/12 LQY 9286-4J (72) Inventor Kenji Yoshino 1 Kawasaki-cho, Chiba-shi, Chiba Kawasaki Steel Co., Ltd. Technical Research Division (72) Inventor Masahiro Wakui 1 Kawasaki-cho, Chiba City, Chiba Prefecture Kawasaki Steel Co., Ltd. Technical Research Division (72) Inventor Hideho Kubo 2-chome Uchiyukicho, Chiyoda-ku, Tokyo No. 3 Kawasaki Steel Co., Ltd. Tokyo head office

Claims (4)

[Claims] 1. The following formulas (I), (II), (III) and (I
V) and (V): (However, X in the formula is a hydrogen atom, an alkyl group having 1 to 4 carbon atoms, an alkoxy group having 1 to 4 carbon atoms, an aryl group having 6 to 10 carbon atoms or a halogen atom, and Ar is It represents a divalent group consisting of one monocyclic or condensed aromatic ring, and Y is —O— or a compound represented by the formula (II-a): Is a group represented by). Units I, II, III represented by
, IV and V, and the content ratio of each unit is unit I 40 to 70 mol% unit II 1 to 8 mol% unit III + unit IV 6 to 36 mol% unit V 10 to 40 mol%, A heat-resistant tableware for oven obtained by molding an aromatic polyester having a unit III / (unit III + unit IV) molar ratio of 0.1 to 0.8. 2. The heat resistant tableware for an oven according to claim 1, further comprising an inorganic filler in an amount of 250 parts by weight or less based on 100 parts by weight of the aromatic polyester. 3. The following formulas (I), (II), (III) and (I
V), (V) and (VI): (However, X in the formula is a hydrogen atom, an alkyl group having 1 to 4 carbon atoms, an alkoxy group having 1 to 4 carbon atoms, an aryl group having 6 to 10 carbon atoms or a halogen atom, and Ar is It represents a divalent group consisting of one monocyclic or condensed aromatic ring, and Y is —O— or a compound represented by the formula (II-a): And Z ₁ is —NH—, and Z ₂ is —.
NH-, -O- or formula (VI-a): And a unit I, II, III or I represented by the formula (1), wherein Z ₁ and Z ₂ are located at the para or meta position relative to each other.
It consists essentially of V, V and VI, and the content ratio of each unit is unit I 40 to 70 mol% unit II 1 to 8 mol% unit III + unit IV 6 to 36 mol% unit V 10 to 40 mol% unit VI A heat-resistant tableware for oven obtained by molding an aromatic polyesteramide having a molar ratio of 0.1 to 10 mol% and a unit III / (unit III + unit IV) of 0.1 to 0.8. 4. The heat resistant tableware for an oven according to claim 3, further comprising 250 parts by weight or less of an inorganic filler with respect to 100 parts by weight of the aromatic polyesteramide.