JPH0321211A - Food cooking container - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Field of Application] The present invention relates to food cooking containers. More specifically, the present invention relates to a food cooking container made of an aromatic polyester resin capable of forming an anisotropic melt phase for use in microwave ovens and microwave ovens.

[Problems to be solved by conventional techniques and inventions
The aromatic polyesters mentioned above are used with various inorganic fillers added as fillers.

However, the skewer filled with inorganic filler causes a decrease in strength and water absorption resistance. Oil absorption resistance decreases. Containers for food preparation, their saucers, etc. may be heated while containing frozen food, and therefore require high strength. In addition, in terms of appearance, oil and phase powder from foods seep into the container, causing discoloration of the container, which has been a problem, and improvements have been desired.

[Means for solving the problem] In view of the above-mentioned current situation, the inventors of the present invention have conducted extensive studies and found that the strength of the aromatic polyester resin is 1.
Water absorption resistance 1 Moisture absorption resistance, water absorption resistance, etc. are improved! 1f was discovered and the present invention was completed.

That is, the present invention relates to a food cooking vessel characterized by a skewer in which talc coated with bismaleimide resin is filled with an aromatic polyester resin capable of forming a cross-sectional melt phase.

The present invention will be explained in detail below.

The aromatic polyester resin capable of forming an anisotropic melt phase as used in the present invention is a thermoplastic resin that exhibits optical anisotropy when melted, and is generally classified as a thermotopic liquid polymer. The aromatic polyester resin that forms the anisotropic melt phase as described above is an aromatic polyester obtained by copolymerizing one or more compounds selected from aromatic hydroxycarboxylic acids, or an aromatic hydroxycarboxylic acid. Mainly composed of acids, aromatic dicarboxylic acids, aliphatic dicarboxylic acids,
an aromatic polyester obtained by copolymerizing at least one or more compounds capable of stoichiometrically forming an ester bond among phosphoric acids, aromatic diols, and aliphatic diols, and aromatic dicarboxylic acids. One type selected from aliphatic dicarboxylic acids, aromatic diols, and aliphatic diols,
Alternatively, it is an aromatic polyester obtained by copolymerizing two or more kinds of compounds.

Examples of aromatic hydroxycarboxylic acids include 4-hydroxybenzoic acid. 3-Hydroxybenzoic acid. Hydroxybenzoic acid such as 2-hydroxy, benzoic acid, 2-hydroxybenzoic acid, 6-hydroxy-2-naphthoic acid. Aromatic hydroxycarboxylic acids such as 5-hydroxy-2-nat-acid or 4-hydroxy-2-methylbenzoic acid. 4-
Hydroxy-3-methylbenzoic acid, 4-hydroxy-2
-Phenylbenzoic acid. 2-chloro-4-hydroxybenzoic acid, 3-chloro-4-hydroxybenzoic acid, 6-hydroxy-5-chloro-2-naphthoic acid, 6-hydroxy-7-chloro-2-naphthoic acid. 6-hydroxy-5,
Examples include alkyl, allyl, and halogen-substituted hydroxybenzoic acids such as 7-dichloro-2-naphthonic acid.

Examples of aromatic dicarboxylic acids include terephthalic acid, isophthalic acid, 4,4-diphenyldicarboxylic acid, and 2,6-naphthalenedicarboxylic acid. Diphenyl ether-464
''-dicarboxylic acid, diphenoxyethane-4,4''-dicarboxylic acid, diphenoxybutane-4,4''-dicarboxylic acid, diphenylmethane-3.4''-dicarboxylic acid, diphenyl-teru-3,3''-monocarboxylic acid Aromatic dicarboxylic acids such as diphenoxyethane-3,3'-dicarboxylic acid and diphenylethane-3,3'-dicarboxylic acid. or an alkyl of the aromatic dicarboxylic acid, such as chloroterephthalic acid, promoterephthalic acid, methylterephthalic acid, t-butylterephthalic acid. Examples include halogen-substituted products.

Examples of aliphatic dicarboxylic acids include trans-1,4-cyclohexanedicarboxylic acid. Cis-1,4-cyclohexanedicarboxylic acid. Examples include cycloaliphatic dicarboxylic acids such as 1,3-cyclohexanedicarboxylic acid, and derivatives thereof.

Examples of aromatic diols include hydroquinone, resorcinol, 4.4-dihydroxydiphenyl, 4.4′-dihydroxydiphenyl ether, 3.4′-dihydroxydiphenyl, 3.4-dihydroxydiphenyl ether, 4.4=-dihydroxy Benzophenone, 3.4-
-dihydroxybenzophenone, 3.3-dihydroxybenzophenone, 4.4-dihydroxydiphenyl sulfone, 4.4-dihydroxydiphenyl sulfide, 4.4=-dihydroxydiphenylmethane, 3.4
"-Dihydroxydiphenyl sulfone, 3,4"-dihydroxydiphenyl sulfide, 3.4"-dihydroxydiphenylmethane, 3.3-dihydroxydiphenyl sulfone, 3.3-dihydroxydiphenyl sulfide. 3.3--dihydroxydiphenylmethane, 2.6-
-Naphthalenediol, 1.6--Naphthalenediol 52.2゛-Bis(4-hydroxyphenyl)propane, aromatic diol exclusively for bis(4-hydroxyphenoxy)ethane, or chlorohydroquinone, bromohydroquinone, methyl Hydroquinone, t-butylhydroquinone, 4-chlorresorcin. Examples include the above-mentioned alkyl- and halogen-substituted aromatic diols such as 4-methylresorcinol.

Examples of aliphatic diols include trans-1,4-cyclohexanediol, cis-1,4-cyclohexanediol, trans-1,4-cyclohexanedimethanol,
Cis-1,4-cyclohexanedimethanol, trans-1,3-cyclohexanediol. Cis-1,2-cyclohexanediol. Trans-1,3-cyclohexanedimethanol, ethylene glycol, 1,4-buta/diol, 1. Examples include cyclic, straight, or branched aliphatic diols such as 6-hexanediol and 1,8-octanediol, and derivatives thereof.

Among the aromatic polyesters made of each of the above components, there are those that form an anisotropic melt phase and those that do not, depending on the constituent components, the composition ratio in the polymer, and the sequence understanding11. is an aromatic polyester capable of forming an anisotropic melt phase.

There are no particular limitations on the method for producing aromatic Boriesder which can form an anisotropic melt phase using the above-mentioned monomers. For example, a typical production method involves using 4-acetoxybenzoic acid and 4-acetoxybenzoic acid.
, 4'-diacetoxydiphenyl, terephthalic acid, and isophthalic acid. The reaction is generally carried out in a nitrogen stream starting at a low temperature and continuously increasing the temperature as the reaction progresses. The obtained granular product can be further subjected to a secondary solid phase polycondensation reaction at a temperature of 200 to 350° C. under reduced pressure or at normal pressure. This operation increases the molecular weight and significantly improves the properties of the polyester obtained. In addition, in order to promote the above reaction, a catalyst such as a Lewis acid pentahydrogen halide, an organic acid, or an inorganic acid salt, and a compound of antimony or germanium may be added at 0.0%.
It can also be used in an amount of 01 to 1.0% by weight.

The melt viscosity of the aromatic polyester resin capable of forming an anisotropic melt phase suitable for use in the present invention is 10 at a temperature between 20° C. and 400° C. above the flow initiation temperature.
10-10 when measured at a shear rate of 3 s e c-'
It exhibits a melt viscosity of 0,000 poise, especially 10,000 poise.
Those exhibiting a melt viscosity of poise or less are preferred. (This melt viscosity can be measured with a conventional cavillary rheometer equipped with a chiabilly 2 mm long x 0.5 mm inside diameter.) If the above melt viscosity is less than 10 poise and 100,000 poise If it exceeds this, it is not preferable because molding of the resin becomes difficult.

In the present invention, the talc contained in the aromatic polyester resin may be a very common talc and is not limited by the asvect ratio or the like. As for the amount added, 30 parts by weight to 70 parts by weight is best in terms of physical properties. Further, as a bismaleimide resin for coating with talc, Mitsubishi Gas Chemical Co., Ltd. has commercially available the product name "rBT Resin". In addition, from the viewpoint of heat resistance, the Tg after curing is preferably 100°C or higher, and the coating amount is 0.01 to 10% relative to talc.
Weight percent is preferred. If the amount is less than 0.01 parts by weight, sufficient strength, moisture resistance, oil absorption resistance, etc. cannot be obtained, and if the amount is more than 10 parts by weight, it is not only uneconomical but also the effect of improving physical properties reaches saturation. The decrease in shapeability cannot be ignored.

[Effects of the Invention] The saucer or food cooking container used in the microwave oven of the present invention has high strength and can be used for a long period of time without causing problems in appearance since the water, color, etc. from the food do not seep into the container. It is possible.

[Examples] Hereinafter, the present invention will be explained in more detail with reference to Examples, but the present invention is not limited thereto.

[Example 1] 3 parts by weight of bismaleimide triazine (manufactured by Mitsubishi Gas Chemical Co., Ltd., trade name: rBT24 1 0TJ) was diluted 20 times with dimethylformamide (DMF), and 50 parts by weight of plate-shaped talc was added.

After stirring and pressing this in a planetary mixer (120°C) to develop DMF, it was heated in an oven at 170°C for 2 hours.
It was allowed to stand for a period of time to harden and then coated.

General formula O below
o Aromatic polyester resin shown by 0 (melt viscosity Nikarasu?ft manufactured by Seisakusho, using Koka type flow tester, measured temperature 390°C shear rate 10""'se
A compound was prepared by mixing 50 fflm parts of 820 bores (using a die with a diameter of 0.5 mm and a capillary length of more than 2 m) and 50 parts by weight of the above-mentioned talc, and then injection molding to form a 70 mm x 70 mm. Corner thickness 2 m
m flat plates were obtained.

Place this flat plate in a glass container containing ketchup and
0), the sample was heated to 200° C. using a 4” OOW electric heater, and then irradiated with 400 W microwave for 10 minutes.

No dimensional or external changes were observed in the flat plate after irradiation. Table 1 shows the results of the tensile test of this flat plate.

Table 1 Comparative Example 1 The same procedure as in Example 1 was carried out except that talc was not coated with bismaleimide triazine.

Although no dimensional changes were observed in the flat plate after irradiation, it was colored red and its appearance was impaired. Table 1 shows the results of the tensile test of this flat plate.

1) Tensile strength is ASTM It was measured.

According to D-638

Claims (1)

[Claims] (1) A food cooking container made of an aromatic polyester resin capable of forming an anisotropic melt phase containing talc coated with a bismaleimide resin.