JPS6244177B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to oxybenzoyl polyester articles for use under high frequency heating.

The oxybenzoyl polyester defined below can be used in applications that take advantage of its own excellent heat resistance, insulation properties, sliding properties, and chemical resistance. Furthermore, by adding fillers such as fluorine-based resins, other resins, or graphite, it is possible to further widen the range of applications. To give an example of a wide range of applications, electrical parts include hair dryer parts (housing, etc.), washing machine parts (bearings, valves, locks, rotors, etc.), video parts (brake rings, etc.), dishwasher parts, and coffee servers. Parts (housing, etc.), tape recorder parts (bearings, etc.),
Clothes dryer parts (pins, etc.), electromagnetic induction range parts (sensor cases, etc.), motor parts (commutators, brush holders, coreless motor parts, etc.), lamp holders (projector sockets, halogen lamp sockets, etc.), potentiometers. Oxybenzoyl polyester is used in a wide range of applications, including coil formers, soldering iron parts, casserole stands, record player parts (tone arm bearings, etc.), and combines the excellent performance of oxybenzoyl polyester. Examples of electronic parts include relay parts (housing, arc insulator, etc.), printed circuit boards, switches (housing, etc.),
Connectors, bobbins, electronic clock parts (housings, stators for trimmer condensers, insulation materials, etc.), level switch parts, electronic exchange parts (microwave absorption parts, bobbins, etc.), IC manufacturing equipment parts (IC sockets, wafer baskets, sleeves, etc.) ), ultrasonic flaw detector parts (sensors, etc.), electron tube parts (insulation rings, etc.), electronic component holders, internal combustion engine cylinder internal pressure measuring device parts (ring element insulation materials, etc.), battery parts (catalyst holders, etc.), resistors, These include hearing aid parts, surface thermometer parts (cup-pull parts, etc.), fuse parts (housing, etc.), and when soldering the windings to the terminals of bobbins, etc., the thin-walled parts are required to have solder heat resistance of 300°C or more. It has characteristics such as sufficient resistance to soldering heat, and relay parts require arc resistance because arcs occur around the contacts, and the arc resistance is excellent at 184 seconds. This contributes to the miniaturization and high reliability of relays. Examples of automotive parts include EGR valves (valve bodies, valve covers, valves, etc.), piston rings, apex seals, plug insulation materials, shock absorber parts (rings, bearings, etc.), bulltozer parts (piston rings, bearings, etc.) , distributor parts (cam, housing, etc.), ignition switch parts (housing, etc.), brake parts (brake material binder, brake,
Bleeders, etc.), exhaust gas pipe parts (sleeves, etc.), exhaust gas temperature sensors (housings, etc.), wire cables, lamp parts (head lamp reflectors, etc.), automobile coolers, sliding materials, etc. Examples of mechanical parts include copy machine parts (bearings, stripper fingers, hot roll coatings, etc.), computer parts (non-wear rings, etc.), line printer parts (guides, back-up bar rings, etc.), compressor parts (pistons, etc.). rings, blades, etc.), soy sauce manufacturing equipment sliding materials, paper dryer parts, spinning machine parts (spindles, pulleys, crimper guides), movie projector parts, vending machine parts (bearings, etc.), glass manufacturing jigs, cathode ray tubes. Manufacturing jigs, wire manufacturing jigs, can making machine jigs, bottle manufacturing equipment jigs (feeding jags, etc.), stern bearings, Oiles bearings (oil-impregnated bearings, three-layer bearings, etc.), underwater bearings, for aseptic factories. Heat-resistant bearings, rolling bearings (bearing rings, etc.), valve parts (valve seats, plugs, etc.), packings, conveyor belts,
Mechanical seals, pulleys, air pumps (rotors, etc.), linear compressors (pistons, etc.), lock parts, reflow solder parts, guide pins for welding, switching valves for liquid chromatography, pump parts for crude oil extraction, pipe flange insulation, heating Piping parts (insulating washers, etc.), extruder parts (dice, etc.), camera bodies, gas calorimeter parts (housing, etc.), sewing machine parts (cams, etc.), lighter parts (housing, etc.), dial gauge parts, refrigerators Insulating materials for stators, air conditioner parts (mufflers, etc.), robot parts, oven bearings, gasoline filters, other synchrotron parts, TLD parts (caps, etc.), abradable seals, binders for grinding wheels, simple molds, heat-resistant fibers It is also used in aircraft tableware, skiing, etc. As a result of various studies by the present inventors, recently, for example, in the case of microwave ovens, there has been a shift to microwave ovens that have an oven heating method using a heater added to the conventional heating method using 2000 MGHZ microwaves. Heat resistance due to oven heating is required as well as heat generation during heating, and polyphenylene sulfide, polyphenylene ether, polysulfon, etc. cannot be used thermally.
In the case of oxybenzoyl polyester, it has sufficient heat resistance to withstand microwave ovens.
Furthermore, it was found to be the most suitable material as it has chemical resistance, leading to the present invention. Conventionally, glass and ceramics have been used for saucers, containers, etc., but because they are heavy and used in hot conditions, there has been a strong demand for something that can replace them.

The oxybenzoyl polyester used in the present invention has the general formula [In the above formula, X is a hydrocarbon group (1 to 20 carbon atoms),
-O-, -SO ₂ -, -S-, -CO-, etc., m
is 0 or 1, and n is 0 or 1. p, q
and r is a positive integer, p+q+r=3~600
Preferably 20 to 200, provided that q=r. ] It is an aromatic polyester with the structure, and the reaction formula is [In the above formula, m, n, and X have the same meanings as above, and R ¹ , R ⁵ and R ⁶ are a benzoyl group, a lower alkanoyl group, or preferably hydrogen,
R ₂ , R ₃ and R ⁴ are hydrogen, benzyl, lower alkyl or preferably phenyl. ] Any method may be used for the polymerization reaction. Compounds of formula () include, for example, para-hydroxybenzoic acid, meta-hydroxybenzoic acid, phenyl-para-hydroxybenzoate, phenyl-meth-
Hydroxybenzoate, paraacetoxybenzoic acid, metaacetoxybenzoic acid, and isobutyl-
Examples include para-acetoxybenzoate. Examples of the compound of formula () include isophthalic acid, terephthalic acid, diphenyl terephthalate, diethyl isophthalate, methyl ethyl terephthalate, isobutyl half ester of terephthalic acid, terephthalic acid chloride, and isophthalic acid chloride. Compounds of formula () include, for example, hydroquinone, resorcinol, diacetoxyresorcinol, 4,4'-biphenol, 4,4'-oxybiphenol, 4,4'-thiobiphenol,
4,4'-dihydroxydiphenyl sulfone, 2,
2-bis(4-hydroxyphenyl)propane,
Examples include 1,1-bis(4-hydroxyphenyl)cyclohexane, 1,1-bis(4-hydroxyphenyl)ethane, bis(4-hydroxyphenyl)methane, and bis(4-hydroxyphenyl)ketone. .

Regarding saucers or containers used for cooking on saucers, it is necessary to take measures such as coloring the appearance to improve appetite. Furthermore, in cases where recent microwave ovens require heat resistance of 300°C, application of an inorganic paint is effective in further improving heat resistance. In that case, it has been found that in the case of oxybenzoyl polyester, it is also possible to apply and bake or laminate an insulating paint, thermosetting resin, etc. that does not pose a food hygiene hazard.

Furthermore, if there are no problems with insulation or food hygiene, it is also possible to add a filler or the like. Examples of fillers include silica, powdered quartz, sand, fused silica, silicon carbide, aluminum oxide, glass fiber, tin oxide, iron oxide, zinc oxide, and titanium dioxide.

Examples will be specifically shown below, but the scope of the present invention is not limited thereto.

Example 1 Oxybenzoyl polyester (copolymer type, registered trademark ECONOL E1000, compression molding grade, manufactured by Sumitomo Chemical Industries) was compression molded at 370°C and 500 kg/cm ² to form a disc-shaped material with a diameter of 46 mm and a thickness of 17 mm. A molded product was obtained.

When this product was placed in a microwave oven manufactured by Mitsubishi Electric Corporation PR701 (high frequency output: 600 W, high frequency: 2450 MC/S) and irradiated with microwaves for 10 minutes, the temperature of the outer layer of the molded product reached 185°C. A Pyrex glass plate (2 kg) was placed on top of it, but it did not deform.

Similarly, oxybenzoyl polyester (copolymer type, registered trademark Econol E2000,
When the same molded product (injection molding grade, manufactured by Sumitomo Chemical Industries) was irradiated with microwaves for 10 minutes, the temperature of the outer layer of the molded product was 170°C. Similarly, no deformation was observed.

Example 2 Injection molding was performed using oxybenzoyl polyester (copolymer type, registered trade name ECONOL E2008, injection molding grade, glass fiber included, manufactured by Sumitomo Chemical Industries), and the bottom diameter was 200 mm, the height was 20 mm,
A tray with a thickness of 3 mm was made, the surface was roughened with sand, and then degreased with perchlorethylene. Spray coat the degreased container with Sumiceram P-100, a completely nonflammable inorganic heat-resistant paint made by Sumitomo Chemical Co., Ltd., and heat it at 10℃/
The temperature was raised at 270° C. and baked for 20 minutes. Mitsubishi Electric places chicken on a painted tray
Place it on the turntable of a microwave oven manufactured by Co., Ltd. (RO-1500 model) and rotate it at 30 rpm.
It was heated to 200°C with a 600W electric heater and irradiated with microwaves with a high frequency output of 500W for 8 minutes. I took it out and checked for dimensional changes, but found no abnormalities. In addition, I washed off the oil with food detergent and looked at the appearance, but there was no change.

Claims (1)

[Claims] 1. A saucer for use in a microwave oven or a food cooking container molded from oxybenzoyl polyester. 2. A saucer or food cooking container according to claim 1 coated with an insulating inorganic paint.