JPH10197362A - Temperature recognition method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain a temperature recognition method in which the temperature state of an object to be heated can be recognized by a method wherein two or more kinds of sheets of thermosensitive recording paper whose coloring temperature is different are bonded to the object to be heated and its coloring operation is observed visually. SOLUTION: When a temperature confirmation method is used, a rise in the temperature of an object to be heated can be grasped from the outside of an electromagnetic- wave heating apparatus. In addition, when two or more kinds of sheets of thermosensitive recording paper whose coloring temperature is different are bonded to the object to be heated, it is possible to find whether the object to be heated is hot or chiily, and to which extent the object to be heated is hot can be confirmed visually without coming into contact with the object to be heated. Consequently, even when a food is heated by using a microwave oven, it is possible to prevent the food from being heated too much or heated insufficiently. In addition, since a metal is not used in a coloring part, the temperature recognition method is safe. In addition, when a sheet of reversible thermosensitive recording paper is used, it can be used repeatedly. In addition, a sheet of detecting paper for electromagnetic-wave heating or a detecting label for electromagnetic-wave heating can be installed simply inside the microwave oven together with the object to be heated.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for confirming the temperature of an electromagnetic wave heating device when heating an object to be heated by the electromagnetic wave heating device.

[0002]

2. Description of the Related Art In recent years, microwave ovens have become widespread in ordinary households as easy-to-use cooking utensils, and a large number of retort foods on the premise of heating with a microwave oven have been sold.
2. Description of the Related Art Generally, a microwave oven irradiates an electromagnetic wave into a refrigerator, molecularly vibrates water or OH groups contained in an object, and heats the substance itself by the vibration energy, and is a kind of an electromagnetic wave heating device.

[0003] Microwave ovens sold in recent years have been improved in ease of use by manufacturers and can be heated with a single switch according to the food to be heated. For foods that do not exist, the intensity of electromagnetic waves and the heating time must be set manually. However, even if the microwave oven is the same or the same manufacturer, the electromagnetic wave intensity varies depending on the model number. For this reason, it is difficult to heat the same food in the same heating time in the same heating time even when trying to heat the same food in different microwave ovens.

[0004] Containers for packaging recent foods are often made of polyolefin resin. Generally, the softening point of a polyolefin resin is low from around 100 ° C. in many cases. For this reason, if the heating is performed excessively in a microwave oven, the container softens and in the worst case, a problem occurs in which the container is melted. In addition, even if the food is not melted, the degree of heating of the food is not known, so that when the food is taken out of the microwave oven, a burn may occur.

[0005] As a device for measuring the temperature of an object, there is a device called a thermo label. Since the temperature indicator contains iron powder, if it is placed in a microwave oven irradiated with electromagnetic waves, a discharge may occur to ignite. And cannot be used.

[0006]

SUMMARY OF THE INVENTION Accordingly, an object of the present invention is to provide an electromagnetic wave heating device which can be attached to an object when the object is heated by the electromagnetic wave heating device and which can recognize the degree of temperature rise from outside. Is to provide a method for confirming the temperature.

[0007]

Means for Solving the Problems The present inventors have made intensive studies to solve the above-mentioned problems, and as a result, have reached the following invention.

That is, the heating temperature of the object to be heated by the electromagnetic wave heating device is known by adhering two or more kinds of heat-sensitive recording papers having different coloring temperatures to the object to be heated and coloring the heat-sensitive recording paper. It is an invention of a method for confirming the temperature of the electromagnetic wave heating device.

The reversible thermosensitive recording paper is adhered to the heated body, and the heating temperature of the adherend to be heated by the electromagnetic wave heating device is known by the color development of the reversible thermosensitive recording paper. It is an invention of a method for checking the temperature of an electromagnetic wave heating device.

[0010] An invention of a temperature detecting paper for an electromagnetic wave heating device, characterized in that printing is performed with two kinds of thermosensitive coloring inks having different coloring temperatures.

[0011] An adhesive layer may be provided on a surface different from the printing surface of the temperature detecting paper for the electromagnetic wave heating device to form a temperature detecting label for the electromagnetic wave heating device.

[0012] The present invention relates to a temperature detecting type heating container characterized in that a reversible thermosensitive coloring ink is printed on the heating container.

According to the method for confirming the temperature of the electromagnetic wave heating device of the present invention, the temperature rise of the object to be heated can be grasped from the outside of the electromagnetic wave heating device, and two or more kinds of heat-sensitive recording papers having different coloring temperatures can be heated. When adhered to the body, it is possible not only to determine whether the object to be heated is hot or cold, but also to check the degree of heat visually without touching the object to be heated. On the other hand, in the case where the reversible thermosensitive recording paper is adhered to the object to be heated, or in the case of a temperature detection type heating container on which the reversible thermosensitive coloring ink is printed, the colored portion of the reversible thermosensitive recording paper can be erased and the color is formed again. It can be used repeatedly due to its ability to be used.

Further, since the temperature detecting paper for the electromagnetic wave heating device and the temperature detecting label for the electromagnetic wave heating device of the present invention are both printed and provided with a thermosensitive coloring layer on the support, the temperature detecting type heating container is also reversible. Because the thermal coloring layer is printed,
The heating state of the object to be heated can be recognized as character information such as "hot" or "appropriate temperature".

[0015]

DETAILED DESCRIPTION OF THE INVENTION The two or more types of heat-sensitive recording papers used in the present invention are not particularly limited as long as they have different color-forming start temperatures and saturation temperatures at which the maximum color density is obtained. What is manufactured by using may be used.

As the support of the thermal recording paper and the temperature detecting paper for the electromagnetic wave heating device used in the present invention, ordinary natural pulp paper such as high quality paper, art paper, glassine paper, cast paper, coated paper and the like can be used. Raw materials usually used in papermaking, such as wood pulp, synthetic pulp, fillers, sizing agents, ultraviolet absorbers, antioxidants, pigments, paper strength agents, and dyes, can be used as needed. In addition, polyethylene, polypropylene, polyethylene terephthalate, polyamide, polyvinyl chloride, polyvinylidene chloride, plastic sheets such as polymethylpentene, and synthetic paper or nonwoven fabric made of these synthetic fibers,
Alternatively, laminated paper obtained by laminating these synthetic resins on one side or both sides of paper may be used. Materials made of these synthetic resins may be white or colored.

There are no particular restrictions on the color former and developer for thermal recording of the thermal recording paper used in the present invention, as long as they are generally used for thermal recording paper. For example,
Examples of the coloring agent for thermal recording include triallylmethane compounds, diarylmethane compounds, xanthene compounds,
Thiazine compounds, spiropyran compounds, diphenylmethane dyes, spiro dyes, lactam dyes, fluoran dyes and the like can be used.

Specifically, 3,3-bis (p-dimethylaminophenyl) -6-dimethylaminophthalide (crystal violet lactone), 3,3-bis (p-dimethylaminophenyl) phthalide, 3- ( p-dimethylaminophenyl) -3- (1,2-dimethylindol-3-yl) phthalide, 3- (p-dimethylaminophenyl) -3- (2-methylindol-3-yl) phthalide, 3 , 3-Bis (1,2-dimethylindole-3
-Yl) -5-dimethylaminophthalide, 3,3-bis (9-ethylcarbazol-3-yl) -6-dimethylaminophthalide, 3,3-bis (2-phenylindol-3-yl)- 6-dimethylaminophthalide, 3-p
-Dimethylaminophenyl-3- (1-methylpyrrol-3-yl) -6-dimethylaminophthalide, 3-p-
Dimethylaminophenyl-3- (1-methylpyrrole-
2- (yl) -6-dimethylaminophthalide 3- (p-dimethylaminophenyl) -3- (2-methylindol-3-yl) phthalide, 3- (p-dimethylaminophenyl) -3- (2- Phenylindol-3-yl) phthalide, 3,3-bis (1,2-dimethylindole-
3-yl) -5-dimethylaminophthalide, 3,3-bis (1,2-dimethylindol-3-yl) -6-dimethylaminophthalide, 3,3-bis (9-ethylcarbazole-3- Yl) -5-dimethylaminophthalide,
3,3-bis (2-phenylindol-3-yl)-
Triallylmethane dyes such as 5-dimethylaminophthalide.

4,4'-bis-dimethylaminophenylbenzhydryl benzyl ether, 4,4'-bis-dimethylaminobenzhydryl benzyl ether, N-halophenylleucouramine, N-2,4,5- Diphenylmethane dyes such as trichlorophenylleuco auramine.

Thiazine dyes such as benzoyl leucomethylene blue and p-nitrobenzoyl leucomethylene blue.

3-methyl-spiro-dinaphthopyran, 3
-Ethyl-spiro-dinaphthopyran, 3,3'-dichlorospirodinaphthopyran, 3-phenyl-spiro-dinaphthopyran, 3-benzyl-spiro-dinaphthopyran,
3-propylspirobenzopyran, 3-methylnaphtho-
Spiro dyes such as (3-methoxybenzo) spiropyran, 3-methyl-naphtho (6'-methoxybenzo) spiropyran, and 3-propyl-spiro-dibenzopyran.

Lactam dyes such as rhodamine-B-anilinolactam, rhodamine (p-nitroanilino) lactam and rhodamine (o-chloroanilino) lactam;

Rhodamine B anilinolactam, rhodamine Bp-chloroanilinolactam, 3-diethylamino-7-dibenzylaminofluoran, 3-dimethylamino-7-dibenzylaminofluoran, 3-diethylamino-7- Octylaminofluoran, 3-diethylamino-7-phenylfluoran, 3-dimethylamino-7-methoxyfluoran, 3-diethylamino-7-
N-diethylaminofluoran, 3-diethylamino-
7-methoxyfluoran, 3-diethylamino-6-methoxyfluoran, 3-diethylamino-6-methyl-
7-chlorofluorane, 3-diethylamino-7-chlorofluorane, 3-diethylamino-6-chloro-7-
Methylfluoran, 3-diethylamino-7- (3,4
-Dichloroanilino) fluoran, 3-diethylamino-7- (2-chloroanilino) fluoran, 3-diethylamino-6-methyl-7-anilinofluoran, 3-
Diethylamino-6-methyl-7-phenylaminofluoran, 3-diethylamino-6,7-dimethylfluoran, 3- (N-ethyl-N-tolyl) amino-6-methyl-7-anilinofluoran, 3 -Piperidino-6
Methyl-7-anilinofluoran, 3- (N-ethyl-
N-tolyl) amino-6-methyl-7-phenethylfluoran, 3-diethylamino-7- (4-nitroanilino) fluoran, 3-dibutylamino-6-methyl-7
-Anilinofluoran, 3- (N-methyl-N-propyl) amino-6-methyl-7-anilinofluoran, 3
-(N-ethyl-p-toluidino) -7-methylfluoran, 3- (N-ethyl-p-toluidino) -6-methyl-7-phenylaminofluoran, 3- (N-ethyl-p-toluidino) ) -6-Methyl-7- (p-toluidino) fluoran, 3-diethylamino-7- (2-carbomethoxy-phenylamino) fluoran, 3-diethylamino-7-N-acetyl-N-methylaminofluoran, 3 -(N-ethyl-N-isoamyl) amino-6
-Methyl-7-anilinofluoran, 3-diethylamino-7-N-chloroethyl-N-methylaminofluoran, 3-diethylamino-7-methyl-N-benzylaminofluoran, 3-diethylamino-7-N- Methylaminofluoran, 3- (N-methyl-N-cyclohexyl) amino-6-methyl-7-anilinofluoran,
3- (N-ethyl-N-iso-amylamino) -6-methyl-7-phenylaminofluoran, 3- (N-cyclohexyl-N-methylamino) -6-methyl-7-phenylaminofluoran, -(N-ethyl-N-tetrahydrofuryl) amino-6-methyl-7-anilinofluoran, 3-piperidino-6-methyl-7-phenylaminofluoran, 3-pyrrolidino-6-methyl-7-
Phenylaminofluoran, 3-diethylamino-6-
Methyl-7-xylidinofluoran, 3-diethylamino-7- (o-chlorophenylamino) fluoran, 3
-Dibutylamino-7- (o-chlorophenylamino)
Fluorane dyes such as fluorane and 3-pyrrolidino-6-methyl-7-p-butylphenylaminofluoran.

As the developer for thermal recording used in the present invention, an electron accepting substance generally used for thermal recording paper is used. In particular, a phenol derivative, an aromatic carboxylic acid derivative or a metal compound thereof, N, N′-diarylthiourea derivatives, mixtures of organic acids and metal compounds, acidic polymers (eg phenol / formaldehyde resins,
Salicylic acid resins or their zinc, magnesium,
Aluminum, calcium, titanium, manganese, tin,
And the like. In particular, phenol derivatives, aromatic carboxylic acid derivatives or metal compounds thereof, N, N'-diarylthiourea derivatives and the like can be used.

Among them, particularly preferred are phenol derivatives, aromatic carboxylic acids and phenolic compounds thereof, and specifically, 1,1-bis (p-hydroxyphenyl) propane and 2,2-bis (p -Hydroxyphenyl) propane, 2,2-bis (p-hydroxyphenyl) butane, 2,2-bis (p-hydroxyphenyl)
Hexane, bisphenolsulfone, bis (3-allyl-4-hydroxyphenyl) sulfone, 4-hydroxy-4'-isopropyloxydiphenylsulfone, 3,4-dihydroxy-4'-methyldiphenylsulfone, diphenolether, p-hydroxy Benzyl benzoate, propyl p-hydroxybenzoate, p-
Butyl hydroxybenzoate, p-tert-butylbenzoic acid, trichlorobenzoic acid, octyl 4-hydroxybenzoate, benzoic acid, terephthalic acid, 3-sec-butyl-4
-Hydroxybenzoic acid, 3-cyclohexyl-4-hydroxybenzoic acid, 3,5-dimethyl-4-hydroxybenzoic acid, salicylic acid, 3-isopropylsalicylic acid, 3
-Tert-butylsalicylic acid, 3-benzylsalicylic acid,
3- (α-methylbenzyl) salicylic acid, 3-chloro-
5- (α-methylbenzyl), 3,5-di-α-methylbenzylsalicylic acid, 3,5-di-tert-butylsalicylic acid, 3-phenyl-5- (α, α-dimethylbenzyl) salicylic acid, 4- tert-butylphenol, 4-hydroxydiphenoxide, α-naphthol, β-naphthol, 4-hydroxyacetophenol, 4-tert-catechol, 2,2′-dihydroxydiphenol, 2,
2′-methylenebis (4-methyl-6-tert-isobutylphenol, 4,4′-isopropylidenebis (2-
tert-butylphenol), 4,4'-sec-butylidenediphenol, 4-phenylphenol, 4,4'-
Isopropylidene diphenol, 2,2′-methylenebis (4-chlorophenol), hydroquinone, 4,4 ′
-Cyclohexylidene diphenol, dimethyl 4-hydroxyphthalate, hydroquinone monobenzyl ether,
Phenolic compounds such as novolak type phenol resins and phenol polymers are exemplified.

In the heat-sensitive recording paper of the present invention, the binder used for forming the heat-sensitive recording layer includes starches, cellulose derivatives such as hydroxyethylcellulose, methylcellulose, ethylcellulose, carboxymethylcellulose, proteins such as casein and gelatin, and oxidized starch. Aqueous natural polymer compounds such as saccharose such as starch, ester compound starch, polyvinyl alcohol, modified polyvinyl alcohol, polyvinyl pyrrolidone, polyacrylic acid, sodium polyacrylate, acrylamide / acrylate copolymer, acrylamide / acryl Acid ester / methacrylic acid terpolymer, alkali salt of styrene / maleic anhydride copolymer, latex, polyacrylamide, styrene / maleic anhydride copolymer Water-soluble synthetic polymer compounds and latexes, such as water-soluble adhesive resins such as alkali salts of ethylene / maleic anhydride copolymer, polyvinyl acetate, polyurethane, polyacrylate, styrene / butadiene copolymer, acrylonitrile / Butadiene copolymer, methyl acrylate / butadiene copolymer, acrylonitrile / butadiene / acrylic acid copolymer, and latex such as ethylene / vinyl acetate copolymer.

In order to further improve the sensitivity of the heat-sensitive recording layer, sensitizers include waxes such as N-hydroxymethyl stearamide, stearamide, and palmitamide, and naphthols such as 2-benzyloxynaphthalene. Derivatives, p-benzylbiphenyl, 4-
Biphenyl derivatives such as allyloxybiphenyl, 1,
2-bis (3-methylphenoxy) ethane, 2,2′-
Polyether compounds such as bis (4-methoxyphenoxy) diethyl ether and bis (4-methoxyphenyl) ether; Carbonic acid or oxalic acid diester derivatives such as diphenyl carbonate, dibenzyl oxalate, and di (p-chlorobenzyl) oxalate can be added.

Examples of the pigment used in the heat-sensitive recording layer include diatomaceous earth, talc, kaolin, calcined kaolin, calcium carbonate, magnesium carbonate, titanium oxide, zinc oxide, silicon oxide, aluminum hydroxide, and urea-formalin resin. Can be

An intermediate layer may be provided below the heat-sensitive recording layer, that is, on the support, to improve heat-sensitive color development and to prevent scum due to printing. There is no problem in providing a protective layer for the purpose of providing.

Coating methods for providing a heat-sensitive recording layer, an intermediate layer, and a protective layer include blade coating, gravure coating, gravure offset coating, bar coating, roll coating, knife coating, air knife coating, and comma coating. Coating method, U comma coating method, AKKU coating method, smoothing coating method, microgravure coating method, reverse roll coating method, four or five roll coating method, dip coating method, drop curtain coating method, slide coating method, die coating method A known coating method can be used.

The reversible thermosensitive recording paper used in the present invention is capable of forming and erasing images, and has no change in color density even when color development and decoloration are repeated many times. If so, there is no particular limitation.

For example, JP-A-54-119377, JP-A-63-39377, and JP-A-63-41
This corresponds to a heat-sensitive recording paper having a heat-sensitive recording layer composed of a resin base material described in JP-A-186-186 and a low-molecular organic compound dispersed in the resin base material. Also, Japanese Patent Application Laid-Open
The heat-sensitive recording paper described in JP-A-81157 and JP-A-50-105555 can be used satisfactorily because the formed image changes according to the environmental temperature. further,
Utilizing the hysteresis characteristics of color components described in JP-A-59-120492, heat-sensitive recording paper having a heat-sensitive recording layer that maintains an image forming state and an erasing state by keeping a recording material in a hysteresis temperature range is also available. good.

On the other hand, JP-A-2-188293, JP-A-2-188294, and International Publication No.
No. 11898, in a reversible thermosensitive recording paper provided with a thermosensitive recording layer composed of a leuco dye and a thermochromic agent which forms and decolorizes the leuco dye by heating, the thermochromic agent causes the leuco dye to develop color. An amphoteric compound having an acidic group and a basic group capable of decolorizing a formed leuco dye.The control of heat energy causes one of a coloring action by an acidic group or a decolorizing action by a basic group to occur preferentially, and the coloring and This is for decoloring and can be used in the present invention.

Further, a reversible thermosensitive recording paper provided with a reversible thermosensitive recording layer for coloring and decoloring a leuco dye by heating as described in JP-A-5-124360 may be used.
There, organic phosphoric acid compounds as electron accepting compounds,
Specific phenol compounds such as α-hydroxyaliphatic carboxylic acids, fatty acid dicarboxylic acids and alkylthiophenols having an aliphatic group having 12 or more carbon atoms, alkyloxyphenols, alkylcarbamoylphenols and alkyl gallates are used as reversible thermosensitive recording materials. Is illustrated.

The two types of heat-sensitive coloring inks used in the temperature detecting paper for an electromagnetic wave heating device of the present invention may be different from each other in color development start temperature and saturation temperature, and are not particularly limited. do it.

The thermosensitive coloring ink composition used in the temperature detecting paper for an electromagnetic wave heating device of the present invention has the same components as those used in ordinary printing inks, that is, vehicles, pigments, and the like.
Auxiliaries and the like can be used.

The vehicle is prepared by appropriately mixing a binder such as an oil, a solvent, and a resin. For example, a vehicle in which a resin is dissolved in a mineral oil, a polymerization varnish of a drying oil, a resin in which a resin is dissolved in a solvent, and the like are used. Can be When the ink is of an ultraviolet / electron beam curable type, the ink may be a solventless system using the ultraviolet / electron beam curable resin itself as a vehicle.

The oils constituting the vehicle include, for example, mineral oil (volatile oil, kerosene, light oil, machine oil, etc.), vegetable oil (linseed oil, tung oil, soybean oil, etc.), synthetic dry oil (dehydrated castor oil, Maleated oil, styrenated oil, vinyltoluene oil, etc.).

Examples of the solvent constituting the vehicle include high boiling petroleum solvents of 200 ° C. or higher, higher fatty acid esters, higher alcohols, glycol solvents, etc.
In the case of non-evaporation drying type ink such as osmotic drying or oxidative polymerization, or methanol, ethanol, n-propyl alcohol, isopropyl alcohol, methyl cellosolve, ethyl cellosolve, methyl acetate, ethyl acetate, butyl acetate, methyl isobutyl ketone, cyclohexane , Toluene, xylene, hexane, ligroin, etc.
(In the case of evaporative drying type ink).

As a binder such as a resin constituting the vehicle, for example, rosin, polymerized rosin, cured rosin,
Rosin ester, maleic acid resin, modified maleic acid resin, phenolic resin, modified phenolic resin, alkyd resin, modified alkyd resin, petroleum resin, hydrogenated petroleum resin, polyamide resin, vinyl resin, acrylic resin, nitrocellulose, ethyl cellulose, Modified amino resin, shellac, rubber derivative, drying oil varnish, and the like.

In the case of the ultraviolet / electron beam-curing type, (meth) acrylate, vinyl, and unsaturated polyester / styrene monomers, oligomers and prepolymers are used as a vehicle component. For example, the following compounds may be mentioned.

(1) Aliphatic, alicyclic, aromatic, araliphatic polyhydric alcohols and poly (meth) acrylates of polyalkylene glycols (2) Aliphatic, alicyclic, aromatic, araliphatic Poly (meth) acrylate of polyhydric alcohol obtained by adding alkylene oxide to polyhydric alcohol (3) Polyester poly (meth) acrylate (4) Polyurethane poly (meth) acrylate (5) Epoxy poly (meth) acrylate (6) Polyamide Poly (meth) acrylate (7) poly (meth) acryloyloxyalkyl phosphate ester (8) vinyl- or diene-based compound having (meth) acryloyloxy group at the side chain or terminal (9) monofunctional (meth) acrylate , (Meth) acryloyl compound (10) rosin ester (meth) acrylate ( 11) Cyano compounds having an ethylenically unsaturated bond (12) Mono- or polycarboxylic acids having an ethylenically unsaturated bond and their alkali metal salts, ammonium salts, amine salts, etc. (13) Ethylenically unsaturated (meth) Acrylamide or alkyl-substituted (meth) acrylamide and its multimer (14) Vinyl lactam and polyvinyl lactam compound (15) Polyether having an ethylenically unsaturated bond and its ester (16) Ester of an alcohol having an ethylenically unsaturated bond ( 17) Polyalcohol having an ethylenically unsaturated bond and its ester (18) Aromatic compound having one or more ethylenically unsaturated bonds such as styrene and divinylbenzene (19) Side chain of (meth) acryloyloxy group or Pos at the end Organosiloxane-based compound (20) Silicone compound having an ethylenically unsaturated bond (21) Vinylpyrrolidone, vinyl ether-based monomer or oligomer (22) Multimer or oligoester (meth) of the compound described in (1) to (20) above Acrylate modified

In addition to the above, it is also possible to use an epoxy / Lewis acid resin or a polyene / thiol resin.

These resins can be used alone or as a mixture with other resins. Further, it can be applied without a solvent or can be dissolved in an organic solvent before use. Also, an appropriate amount of a polymerization inhibitor can be added.

In the case of using an ultraviolet curable ink, it is necessary to add a photoinitiator at the stage of mixing. Examples of typical photoinitiators include acetophenones, benzophenone,
Michler's ketone, benzyl, benzoin and derivatives thereof, benzoin alkyl ethers, benzyl ketals, tetramethylthiuram monosulfide, xanthones, thioxanthones, azo compounds, anthraquinones, oximes, (radical polymerization system), onium salts (cations) Polymerization type). The amount of the photoinitiator to be used is usually in the range of 0.1 to 10% by weight based on the ultraviolet curable resin.

A photosensitizer may be used together with the photoinitiator. For example, amines (aliphatic amines, amines containing aromatic groups, nitrogen heterocyclic compounds such as piperidine), urea (allylic, o-tolylthiourea, etc.), sulfur compounds (sodium diethyldithiophosphate, aromatic sulfinic acid) Soluble salts, etc.), nitriles (N, N-disubstituted-p-
Aminobenzonitrile compounds, etc.), phosphorus compounds (tri-n-butylphosphine, sodium diethylthiophosphate, etc.), other nitrogen-containing compounds (Michler's ketone, N-nitrosohydroxylamine derivatives, oxazoline compounds, etc.), chlorine compounds (tetrachloride) Carbon, hexachloroethane, etc.).

In some cases, a storage stabilizer is used in combination with the photoinitiator. For example, quaternary ammonium chloride, diethylhydroxyamine, cyclic amide, nitrile compound, substituted urea, benzothiazole, hydroquinone, hydroquinone monomethyl ether, organic acids such as lactic acid, oxalic acid, and benzoic acid, copper naphthenate, and the like.

In order to control the hue, ink viscosity, and in the case of an ultraviolet curable ink, the curability of the ink, the pigment may be added to the ink composition at all. Examples of the pigment include titanium oxide, zinc white, lithopone, calcium carbonate, magnesium carbonate, aluminum hydroxide, alumina white, barium sulfate, zinc oxide, kaolin, activated clay, silica (white carbon), lamp black, carbon black, Chrome yellow, chrome green, cadmium yellow, cadmium red, molybdenum red, navy blue, ultramarine, azo pigments, phthalocyanine pigments, lake pigments, toners, and the like.

Compounds (compounds, non-crystal compounds, gel compounds, and the like) may be used as auxiliaries for the purpose of improving printability, accelerating drying, and preventing show-through.
Heat set compounds, etc.), dryers (resin acid salts such as lead, manganese, cobalt, etc., fatty acid salts, other organic acid salts, non-periodic acid salts, etc.), silicone, starch, metal soap, ultraviolet absorber, antioxidant, fluorescent Dyes, starch, dextrin and the like may be appropriately added to the ink composition.

The method of kneading the ink is selected from known methods such as a three-roll mill method, a kneader method, a flash method, a method using a media type disperser (sand mill, ball mill, attritor, etc.), a chip method and the like. .

The method for printing the thermosensitive coloring ink on the temperature detecting paper for the electromagnetic wave heating device of the present invention uses a known technique such as offset printing, letterpress printing, intaglio printing and the like, which is suitable for the thermosensitive coloring ink. I just need.

Two types of thermal recording paper used in the present invention,
The difference between the color development start temperature and the saturation temperature of the thermosensitive coloring ink is preferably from 10 to 30 ° C, more preferably from 10 to 30 ° C.
20 ° C. Further, if only one of the coloring start temperature and the saturation temperature is different, the difference in the saturation temperature may cause the color of the thermosensitive recording paper to be smaller or the printing area of the thermosensitive coloring ink to be smaller. The change is preferable because it is easy to determine.

As the material used for the adhesive layer of the temperature detecting label for an electromagnetic wave heating device of the present invention, general acrylic resin, natural and synthetic rubber, styrene / butadiene copolymer, polyvinyl acetate, vinyl acetate / ethylene copolymer Coalescing,
Resins such as starch, silicone compounds, glue, casein, polyvinyl alcohol, polyurethane and polyurethane can be used alone or in the form of a solution, an aqueous solution or an emulsion. Preferably, a synthetic resin is used. As a method for setting these adhesives, any method such as heat drying and hot melt may be used.

The method of applying the adhesive layer of the detection label for an electromagnetic wave heating device of the present invention includes a blade coating method, a gravure coating method, a gravure offset coating method, a bar coating method, a roll coating method, a knife coating method, and an air knife coating method. , Comma coating method, U comma coating method, AKKU coating method, smoothing coating method, microgravure coating method, reverse roll coating method, four or five roll coating method, dip coating method, drop curtain coating method, slide coating method, Known coating methods such as a die coating method can be used.

The container used for the temperature detection type heating container of the present invention is not particularly limited, and is not particularly limited as long as it can be used in a microwave oven without any problem and can be printed.

The operation of the present invention will be briefly described below. With the electromagnetic wave heating device temperature confirmation method of the present invention,
Even when food is heated using a microwave oven, there is no possibility of overheating or insufficient heating. Further, since no metal is used in the coloring portion, it is safe, and if reversible thermosensitive recording paper is used, it can be used repeatedly. Also,
The detection paper for electromagnetic wave heating or the detection label can be easily installed in the microwave oven together with the object to be heated.

[0057]

EXAMPLES The present invention will be described below with reference to examples of the present invention, but the present invention is not limited to these examples. Further, “parts” and “%” shown in the examples are parts by weight and% by weight unless otherwise specified.

<Formation of Support> The support was prepared by mixing 72 parts of LBKP (freeness of 420 mlcsf) and NBKP (freeness of 44).
0 mlcsf) 25 parts of pigment having a ratio of light calcium carbonate / heavy calcium carbonate / talc of 32/33/35 to 100 parts of wood pulp consisting of 28 parts of 28 parts, 0.12 part of commercially available alkyl ketene dimer, and commercially available cationic acrylamide After preparing 0.03 parts, 1.2 parts of commercially available cationized starch, and 0.5 parts of a sulfate band, the basis weight was 10 using a fourdrinier paper machine.
Papermaking was performed at 0 g / m ² . This support is referred to as support A.

<Preparation of Intermediate Layer Coating Solution> Ansilex (calcined kaolin made by Engelhard, oil absorption 80 ml / 100 g according to JIS-K5101 method) 100 parts 10% sodium hexametaphosphate 4 parts 20% MS4600 (manufactured by Nippon Shokuhin, phosphate ester Starch) 30 parts 48% Styrene butadiene copolymer latex 40 parts Water 90 parts were stirred and dispersed to prepare a coating solution for the intermediate layer at a solid concentration of 40%.

<Preparation of heat-sensitive coating solution> 1) Preparation of solution A 35 parts of 3-dibutylamino-6-methyl-7-anilinofluoran (dye) 105 parts of 5% polyvinyl alcohol 105 parts of solution A was dynomill (Shinmaru Enterprises) Was used to pulverize to a volume average diameter of 0.5 μm. 2) Preparation of solution B 2,4'-dihydroxydiphenylsulfone (developing agent) 50 parts 2-benzyloxynaphthalene (sensitizer) 20 parts 1,1,3-tris- (2-methyl-4-hydroxy) -5-cyclohexylphenyl) butane 10 parts 5% polyvinyl alcohol 100 parts 40% zinc stearate emulsion (manufactured by Chukyo Yushi Co., Ltd., Hydulin SZ40) 20 parts The B solution was volume averaged with a Dynomill (Shinmaru Enterprises) 1 .1 μm. 3) Preparation of liquid C 35 parts of light calcium carbonate 3.5 parts of 10% sodium hexametaphosphate 3.5 parts of water 63 parts of liquids A, B and C are mixed, and the 10% PVA liquid is further solidified so as to become 20% of the total solid. It was added to give a heat-sensitive coating solution.

<Preparation of protective layer coating liquid> 10% polyvinyl alcohol 100 parts 40% zinc stearate emulsion liquid (manufactured by Chukyo Yushi, Hydulin SZ40) 5 parts 20% silicic acid (Mizusawa Chemical, Mizukasil P527) 50 parts A coating liquid for a protective layer was prepared so that the solid content concentration was 10%.

<Preparation of reversible thermosensitive coating liquid> A ball mill was used to prepare 40 parts of 3-di-n-butylamino-6-methyl-7-anilinofluoran, a dye precursor, together with 90 parts of a 2.5% aqueous solution of polyvinyl alcohol. For 24 hours to obtain a pigment precursor dispersion. Next, N- [3
-(P-hydroxyphenyl) propiono] -N'-n
100 parts of octadecanohydrazide was pulverized together with 400 parts of a 2.5% aqueous solution of polyvinyl alcohol in a ball mill for 24 hours to obtain a dispersion. After mixing the above two dispersions, an acrylic emulsion (manufactured by Seiden Chemical Co., Sibinol EK-44, solid content 40%) as a binder 20
0 parts and 400 parts of water were added and mixed well to prepare a reversible thermosensitive coating liquid.

Example 1 (A) Preparation of heat-sensitive recording paper 1 A heat-sensitive coating liquid prepared by the preliminary operation was applied to one side of the support prepared by the preliminary operation using an air knife coater so that the coating amount was 5 g / m ^2. It was smeared and dried to provide a heat-sensitive layer. Using an air knife coater, apply a protective layer coating liquid prepared in a preliminary operation on the heat-sensitive layer so that the coating amount is 3 g / m ² .
After drying, a thermosensitive recording paper was prepared. The color development start temperature of this thermosensitive recording paper was measured and found to be 90 ° C. This thermal recording paper is referred to as thermal recording paper A. (B) Preparation of heat-sensitive recording paper 2 Using a blade coater on one side of the support prepared in the preparatory operation, smear the intermediate layer coating liquid prepared in the preparatory operation so that the coating amount becomes 8.5 g / m ^2. And dried to form an intermediate layer. Using an air knife coater, the amount of smear is 5
The heat-sensitive coating solution prepared by the preliminary operation was smeared to give g / m ² and dried to prepare a heat-sensitive recording paper. The color development start temperature of the thermosensitive recording paper was 65 ° C. This thermal recording paper is referred to as thermal recording paper B. Example 1 is a temperature checking method using both of the two types of heat-sensitive recording papers A and B having different coloring start temperatures.

Example 2 Polyethylene terephthalate (PET) having a thickness of 90 μm
The sheet was coated with a reversible thermosensitive coating solution prepared by a preliminary operation so that the amount of smear was 4, and dried to obtain a reversible thermosensitive recording paper. The color development starting temperature of the reversible thermosensitive recording paper was 90 ° C. Example 2 is a temperature checking method using this reversible thermosensitive recording paper.

Example 3 The heat-sensitive coating liquid prepared by the preliminary operation was printed on one side of the support prepared by the preliminary operation as a thermosensitive coloring ink by the gravure printing, and the letters "end of heating" were printed at the same time. The layer coating liquid is partially solid printed by gravure printing, and the heat-sensitive coating liquid prepared by preliminary operation is printed on the solid printing part as a heat-sensitive color developing ink by gravure printing with the letters `` Heating '' and the temperature for the electromagnetic wave heating device Detection paper was used. When the heat-sensitive coating liquid prepared in the preliminary operation was printed by gravure printing, the color development start temperature was 90 ° C. for those without an intermediate layer, and 75 ° C. for those with an intermediate layer. This temperature detection paper for an electromagnetic wave heating device is referred to as a third embodiment.

Example 4 An acrylic adhesive HVC3300 (manufactured by Toagosei Co., Ltd.) was coated on the release surface of release paper with a gravure coater at a coating amount of 6%.
g / m ² , dried with hot air, and laminated on the non-printing surface with the temperature detecting paper for electromagnetic wave heating prepared in Example 3 to obtain a temperature detecting label for an electromagnetic wave heating device. This temperature detection label for electromagnetic wave heating is Example 4.

Example 5 A reversible thermosensitive coating liquid prepared by a preliminary operation was printed on the side surface of a microwave heating cup as a reversible thermosensitive coloring ink with the word "suitable temperature" to obtain a temperature detecting type heating container.

Example 6 A heat-adhesive type recording paper provided with a heat-adhesive resin layer which exhibits adhesiveness by heating on one side of a support is attached to a postcard on a transparent lid of a case. The word "end of heating" was printed as a reversible thermosensitive coloring ink with the reversible thermosensitive paper thermosensitive coating liquid prepared by the preliminary operation to obtain a temperature detection type heating container.

Comparative Example 1 Comparative Example 1 is a method for checking the temperature using only the heat-sensitive recording paper A prepared in Example 1.

Comparative Example 2 A temperature confirmation method using a thermo label (manufactured by NOF Engineering Co., Ltd.) is referred to as Comparative Example 2.

COMPARATIVE EXAMPLE 3 Heating was carried out using a program of a microwave oven without taking a method for checking the temperature.

[Test Method] Temperature Detection Test 1 A thermosensitive recording paper, a reversible thermosensitive recording paper, a temperature detecting paper or a label was cut into a piece of 10 mm × 20 mm, and a sheet without an adhesive layer was a cellophane tape, and a sheet with an adhesive layer was separated. Peel off the pattern and paste it on the side of the microwave heating cup containing 100 g of water. Place the cup in the center of the dish in the microwave oven and start heating. The heating time was set to a time corresponding to 100 g of the object to be heated. The heating is stopped at the time when a change is recognized in each temperature check method or at the end of the set heating time, and the temperature of the water and the heating time are measured. The target water heating temperature is 80 ° C., which is determined to be appropriate for use as hot water, and the closer the temperature is, the better. In Example 1, one sheet of thermal recording paper A and one sheet of thermal recording paper B were used, and a total of two sheets
Stick it to the side of the microwave heating cup containing 00g.

Temperature Detection Test 2 A case was prepared in which a heat-adhesive recording paper provided with a heat-adhesive resin layer on one side of a support, which exhibits adhesiveness by heating, was attached to a postcard. Fifty postcards are stacked so that the heat-bonded surface and the postcard back surface face each other, and the papers and detection papers produced or used in the examples and comparative examples are cut out to the outside of the bundle, cut into large postcards, laminated, and foamed sheets. And put the lid in the case. Place the case around the microwave oven dish and heat. Heating was performed until a change was observed in each temperature confirmation method. In Comparative Example 3, the heating time was set to 4 minutes. In Example 1, one thermosensitive recording paper A and one thermosensitive recording paper B were used for a total of 2 sheets.
Put the lid on the case together with the foam sheet so that both can be seen from the outside. After the heating is completed, the heat-bonded recording paper and the postcard are taken out, and the number of completely bonded sheets is checked. Also check the number of postcards or heat-adhesive recording sheets that have been scorched due to excessive heating. It is preferable that the number of bonded sheets is closer to 50, and it is preferable that there is no burned one.

[0074]

[Table 1]

Evaluation: As can be seen from the evaluation results, Comparative Example 1 is a method for confirming the temperature using only the higher color developing temperature of the thermal paper used in Example 1; Compared to using thermal papers with different temperatures, it is necessary to keep an eye on the paper, and when the thermal paper develops its color, the temperature of the water has risen considerably. On the other hand, in the first embodiment, first, the thermal paper having a lower coloring temperature develops a color, which has the meaning of advance notice, and prevents overheating. Therefore, in Comparative Example 1, about five sheets were burned when the postcard and the heat-adhesive recording paper were bonded together.

Further, in Comparative Example 2 using a thermolabel, the color of the thermolabel is not detected by detecting the temperature of the object to be bonded, but rather indicates the temperature of the thermolabel itself, or is heated around 80 ° C. However, the temperature of the water was far from the target of 80 ° C. Further, since the thermometer has a small temperature indicator, it is very difficult to confirm a change in color on the front glass of a microwave oven that is shielded so that electromagnetic waves do not leak to the outside. This can also be seen from the large number of burnt items in the bonding of the postcard and the heat-adhesive recording paper. In Comparative Example 3, since the temperature of the object to be heated was not monitored at all, the result was considerably bad.

However, in Examples 1, 3, and 4 in which colorants having different coloring temperatures coexist, excellent results are obtained. The reversible thermosensitive recording paper of Example 2 can be used repeatedly. Furthermore, a temperature detection type heating vessel which focuses on being reusable has also shown good results.

[0078]

By using the method for checking the temperature of the electromagnetic wave heating device of the present invention, it is possible to easily read the temperature change of the object to be heated, which is effective.

Claims (5)

[Claims] 1. The heating temperature of an object to be heated which is heated by an electromagnetic wave heating device is determined by adhering two or more kinds of heat-sensitive recording papers having different coloring temperatures to the object to be heated and coloring the heat-sensitive recording paper. The method of confirming the temperature of the electromagnetic wave heating device. 2. A repetitive use wherein the heating temperature of an adherend to be heated by an electromagnetic wave heating device is known by adhering a reversible thermosensitive recording paper to a heated body and developing a color of the reversible thermosensitive recording paper. Possible method of checking the temperature of the electromagnetic wave heating device. 3. A temperature detecting paper for an electromagnetic wave heating device, wherein the temperature detecting paper is printed with two kinds of thermosensitive coloring inks having different coloring temperatures. 4. A temperature detecting label for an electromagnetic wave heating device, wherein an adhesive layer is provided on a surface different from a printing surface of the temperature detecting paper for an electromagnetic wave heating device according to claim 3. 5. A heating container of a temperature detection type wherein reversible thermosensitive coloring ink is printed on the heating container.