JP3385664B2 - Water wetness judgment sheet - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a water-wetting determination sheet which is attached to the inside of an electric product or the like used outdoors and used for judging whether the electric product or the like has a history of being submerged in water. Regarding

[0002]

2. Description of the Related Art Radios, video cameras, pagers,
Since electric appliances such as mobile phones are often used outdoors and there is a high risk of getting wet with rain or splashing with water, some water resistance and waterproofness are considered.

However, a user mistakenly drops these electric products into a puddle and wets them, so that the circuits inside the products get wet and malfunction, or the functions of the electric products are impaired. In such a case, the user, that is, the general consumer, is inadvertently subject to paid repair. However, it may be difficult to objectively determine whether the cause of the failure is submergence due to negligence or the like, or whether the failure spontaneously occurs within the range of normal use.

Therefore, a hydrophobic synthetic resin coating (or ink) prepared by dispersing and mixing a water-soluble powdery basic agent or a powdery acidic agent containing an acid-base indicator on a substrate sheet such as paper or nonwoven fabric or a resin film is used. A water-wetting determination sheet such as a label formed by application is attached in advance to the inside of a product such as an electric product, and the product is submerged or wet so that water penetrates into the product, causing a failure. In this case, the water that has penetrated into the product adheres to the water-wetting determination sheet and permeates, and is contained in the coating solution and a solution of the water-soluble powdery basic agent or powdery acid agent dispersed in the coating material of the sheet. A color reaction occurs with the acid-base indicator, causing discoloration of the paint or bleeding.

By checking the presence or absence of discoloration or bleeding due to submersion or wetting with a water wetting determination sheet, it is objectively determined whether or not the cause of the failure is due to water wetting.

[0006]

However, the above-mentioned conventional water-wetting determination sheet simply comprises a base sheet, which contains an acid-base indicator and is dispersed and mixed with a water-soluble powder basic agent or a powder acid agent, and is mixed with water. A hydrophobic synthetic resin coating (or ink) having low affinity and low water permeability (absorption) is applied, and a water wetting determination sheet using such a hydrophobic synthetic resin coating is A slight amount of water does not easily cause discoloration or bleeding.

[0007] In addition, electric products and the like often cause a failure due to an electrical short circuit even if a small amount of water penetrates into the product.

For example, because a product such as an electric product is kept submerged in water for a relatively short time or wetted for a relatively short time, only a small amount of water can penetrate into the product, and therefore the product is placed inside the product. When only a small amount of water adheres to the water wetting determination sheet, discoloration or bleeding of the paint is not significant in the conventional water wetting determination sheet, so a slight water infiltration may cause a failure in the product. Even if it were, it was difficult to determine whether the cause was water wetting.

Further, in the case of a water-wetting determination sheet using a cobalt-based or amine-based dye (colorant), it can be seen that the sheet is discolored and submerged due to water-wetting, but after the determination sheet has dried. Then, there is a problem that the trace of the discoloration disappears and the state returns to the original state, and it becomes impossible to discriminate.

According to the present invention, the color does not change even with a slight degree of wetness such as spontaneous dew condensation due to climate change, change in temperature and humidity of the outside air, etc., and water invades inside the product due to wetness or submersion of the product. It is a water-wetting determination sheet that causes discoloration when wet with water, and the discoloration state can be maintained after the sheet is dried.

[0011]

According to claim 1 of the present invention
The invention relates to a lipophilic first resin layer 2 in which a water-soluble basic powder agent and / or a water-soluble acidic powder agent is dispersed and mixed in a lipophilic synthetic resin on a base sheet 1, and a hydrophilic synthetic resin. The hydrophilic second resin layer 3 in which a resin is mixed with a water- soluble or alcohol-soluble acid-base indicator is sequentially laminated,
The second resin layer 3 is a part of the first lipophilic resin
It is a water-wetting determination sheet characterized by being laminated on layer 2 . The invention according to claim 2 of the present invention is a substrate
Water-soluble basic powder on lipophilic synthetic resin on sheet 1
And / or water-soluble acidic powder dispersed and mixed
Of the first resin layer 2 and the hydrophilic synthetic resin are water-soluble or
Hydrophilic first mixed with alcohol-soluble acid-base indicator
2 resin layers 3 are sequentially laminated, and the hydrophilic second resin layer
3, water-soluble acidic powder or basic powder is added
Is a water-wetting determination sheet. Starting
The invention according to claim 3 of the present invention is characterized in that lipophilicity is provided on the base material sheet 1.
Water-soluble basic powder and / or water-soluble synthetic resin
A lipophilic first resin layer 2 in which an acidic powder agent is dispersed and mixed;
Water-soluble or alcohol-soluble acid in aqueous synthetic resin
A hydrophilic second resin layer 3 mixed with a base indicator is sequentially stacked.
And the hydrophilic second resin layer 3 is appropriately partially
It is laminated on the lipophilic first resin layer 2 and is hydrophilic.
Water-soluble acidic powder or basic powder on the second resin layer 3 of
Water wetting judgment sheet characterized by the addition of an agent
Is. The invention according to claim 4 of the present invention is the base sheet 1
On top, water-soluble basic powder or // lipophilic synthetic resin
And lipophilic first tree in which water-soluble acidic powder is mixed and mixed
The oil layer 2 and the hydrophilic synthetic resin are water-soluble or alcohol
Hydrophilic second resin layer mixed with a soluble acid-base indicator
3 is laminated in order, and the lipophilic synthetic resin is chlorinated.
Polypropylene, the hydrophilic synthetic resin is
Water-wetting determination sheet characterized by being cellulose
Is.

[0012]

EXAMPLE A water wetting determination sheet of the present invention is shown in FIG.
Detailed description will be given below with reference to the embodiment of FIG.
As shown in one embodiment of (a), a base material made of paper such as high-quality paper, art paper, or coated paper, made of synthetic resin, made of metal, or made of a composite material obtained by combining any of these. A lipophilic first resin layer 2 in which a water-soluble basic powder 2b is dispersed and mixed in a lipophilic synthetic resin 2a is provided on the sheet 1 in whole or in an appropriate part.

The lipophilic first resin layer 2 comprises a lipophilic synthetic resin 2a as a vehicle, and a hydrophilic basic powder 2b dispersed and mixed in the vehicle.

On the lipophilic first resin layer 2 in which the basic powder agent 2b is dispersed and mixed, the hydrophilic synthetic resin 3 is entirely covered.
The hydrophilic second resin layer 3 in which the acid-base indicator 3b soluble in water or alcohol (methyl alcohol, ethyl alcohol, propyl alcohol) is mixed is provided in a.

As another embodiment shown in FIG. 1 (b), a hydrophilic second resin layer 3 is partially (in a pattern of patterns, letters, symbols, etc.) provided on the first resin layer 2. It is a thing.

The hydrophilic second resin layer 3 is formed by adding water or alcohol to the hydrophilic synthetic resin 3a, which changes from colorless to colored (coloring) or from colored to colorless or from colored to colored in the basic region. It is a mixture of soluble acid-base indicators 3b.

Further, in the present invention, as shown in FIG.
(B) As shown in one embodiment and another embodiment, the second resin layer 3 is not directly affected by humidity on the hydrophilic second resin layer 3 mixed with the above-mentioned indicator. Or a transparent hydrophilic surface protective layer 4 is provided if necessary so as not to be contaminated with hand oil or external dust, and the base sheet 1
It is possible to provide a heat-sensitive adhesive layer, a pressure-sensitive adhesive layer (or a pressure-sensitive adhesive layer to which release paper is temporarily adhered), etc. on the back surface and use it as a seal or label.

In the present invention, the color tone (surface color) of the base sheet 1 is not particularly limited, but pure white is suitable.

As shown in FIGS. 1 (a) and 1 (b), the lipophilic synthetic resin 2a constituting the lipophilic first resin layer 2 is a saturated polyester resin (polyethylene terephthalate) or an unsaturated polyester resin. ,PVC,
Vinyl chloride-vinyl acetate copolymer, polystyrene resin,
Suitable water-insoluble synthetic resin such as polyethylene resin, polypropylene resin, acrylic resin (polymethylmethacrylate) can be used, and soft elastomer synthetic resin such as soft modified polymer (soft modified polymer) is suitable. The following is an elastomer synthetic resin composed of a hard segment as a main component and a soft segment that imparts elasticity.

Chlorinated polyethylene having a chlorinated polymer such as chlorinated polyolefin as a soft segment,
A chlorinated polymer-based elastomer such as chlorinated polypropylene, a polystyrene-based elastomer, a polyolefin-based elastomer, a polyester-based elastomer, a polyamide-based elastomer, a polyurethane-based elastomer, a fluorine-based elastomer, or an ion-crosslinked elastomer can be used.

As the soft modified polymer used as the lipophilic synthetic resin 2a, the soft segment (for example, chlorinated polyethylene, chlorinated polypropylene, or polyisoprene, polybutadiene, saturated polybutadiene) constituting the elastomer synthetic resin, It is possible to use only polyester, polyether, amorphous polyvinyl chloride, amorphous polyethylene, ethylene propylene rubber, fluorine rubber, etc.).

Further, as the water-soluble basic powder agent 2b (powdered alkaline agent) dispersed and mixed in the lipophilic synthetic resin 2a constituting the lipophilic first resin layer 2, sodium carbonate, sodium bicarbonate, Potassium carbonate, calcium carbonate, etc. can be used.

Further, boric acid, selenic acid, iodic acid, oxalic acid, and citric acid are used as the water-soluble acidic powder agent 2b dispersed and mixed in the lipophilic synthetic resin 2a constituting the lipophilic first resin layer 2. , Succinic acid, tartaric acid, etc. can be used.

Next, as the hydrophilic synthetic resin 3a constituting the hydrophilic second resin layer 3 mixed with the acid-base indicator 3b, methyl cellulose, ethyl cellulose, polyvinyl alcohol, etc., rosin, shellac, etc., or gelatin system is used. The hydrophilic synthetic resin can be used.

Further, the acid-base indicator 3b mixed in the hydrophilic synthetic resin 3a constituting the hydrophilic second resin layer 3
As the known acid-base indicator soluble in water or lower alcohols (methyl alcohol, ethyl alcohol, propyl alcohol), for example, water-soluble or lower alcohol-soluble acid-base indicators include methyl yellow and methyl orange. , Ethyl orange, alizarin yellow, thymol blue, cresol green, cresol red, methyl red, phenolphthalein and the like can be used.

Table 1 below shows various acid-base indicators, the optimum solvent, the pH range of the color change, and the color tone of the color change for the indicators.

[0027]

[Table 1]

The setting of the respective discoloration pH ranges adapted to the above-mentioned acid-base indicators 3b is carried out by using the basic powder agent or the acidic powder agent 2a in the lipophilic first resin layer 2 or the hydrophilic second resin layer 3. The pH range can be set by adding an appropriate amount of each of the water-soluble acidic agent or basic agent corresponding to the amount of, and as the acidic agent, boric acid, selenic acid, iodic acid, oxalic acid, and citric acid can be used. Acids, succinic acid, tartaric acid, fatty acids and the like, and basic agents include sodium carbonate, sodium bicarbonate, potassium carbonate, calcium carbonate and the like.

In the water wetting determination sheet of the present invention, the surface protective layer 4 provided as necessary as shown in FIGS. 1 (a) and 1 (b) is a transparent hydrophilic synthetic resin (ethyl cellulose). , Polyvinyl alcohol, etc.), O
P varnish (normally used overprint natural varnish or synthetic varnish) can be used. For example, natural linseed oil-based varnish or synthetic varnish for rosin, shellac, methylcellulose, ethylcellulose, nitrocellulose-based overprint Synthetic varnish can be used.

In the water wetting determination sheet of the present invention, the lipophilic first resin layer 2, the second resin layer 3, the surface protective layer 4, or any one of these layers may be used. In order to form a light color tone, if necessary, a color material such as a pigment used in the printing ink (lake red C,
Disazo yellow, phthalocyanine green, phthalocyanine blue, dioxazine violet, carbon black, titanium white, etc.) can be added in appropriate amounts.

Next, specific examples of the water wetting determination sheet of the present invention will be shown below. <Example 1> The following formulation Sodium carbonate (powder) 10 parts by weight Chlorinated polypropylene resin 10 parts by weight Oily solvent (toluene) 20 parts by weight is kneaded using a ball mill without water to disperse the basic agent. A relatively transparent ink was prepared by dispersing and mixing a basic powder agent for forming the mixed lipophilic first resin layer.

Subsequently, the following formulation: ethyl cellulose 10 parts by weight Phenol red (acid-base indicator) 1 part by weight Alcohol (methanol) 70 parts by weight was kneaded using a ball mill to form a hydrophilic second resin layer mixed with the indicator. A hydrophilic ink mixed with an indicator to form was made.

Next, pure white roll paper (quality paper 64 g / m ²
Alternatively, an ink for forming a lipophilic first resin layer in which the above basic agent is dispersed and mixed is applied on the entire surface of a base material sheet of art paper 84.9 g / m ² ) by a gravure coater, and an oil solvent content is applied. (Toluene) was evaporated and dried to form a lipophilic first resin layer (transparent layer) in which the basic agent was dispersed and mixed.

Subsequently, a hydrophilic ink mixed with the above-mentioned indicator was applied on the entire surface of the above lipophilic first resin layer with a gravure coater, and the alcohol was volatilized and dried,
A hydrophilic second resin layer mixed with an indicator was formed.

Thereafter, if necessary, ethyl cellulose having water or alcohol as a solvent or an alcohol mixed solution as a solvent is applied onto the hydrophilic second resin layer mixed with the above-mentioned indicator to form a surface protective layer. Then, a water wetting determination sheet whose surface standard color was yellow or pale yellow was obtained.

Example 2 The following formulation Sodium carbonate (powder) 10 parts by weight Chlorinated polypropylene resin 10 parts by weight Oily solvent (toluene) 20 parts by weight were kneaded using a ball mill without the interposition of water to form a base. An ink was prepared by dispersing and mixing a basic agent to form the lipophilic first resin layer in which the basic agent was dispersed and mixed.

Subsequently, the following formulation was kneaded with 10 parts by weight of ethyl cellulose, 1 part by weight of phenol red (acid-base indicator), 70 parts by weight of alcohol (methanol), and 1 part by weight of blue colorant (phthalocyanine blue) using a ball mill. A hydrophilic ink (blue) mixed with an indicator for forming a hydrophilic second resin layer mixed with the indicator was prepared.

Next, pure white roll paper (quality paper 64 g / m ²
Alternatively, a lipophilic ink containing the above basic agent dispersed and mixed is coated on the entire surface with a gravure coater on a base material sheet of 84.9 g / m ² ) of art paper, and the oil solvent (toluene) is volatilized and dried. Then, the lipophilic first resin layer in which the basic agent was dispersed and mixed was formed.

Subsequently, a hydrophilic ink mixed with the above-mentioned indicator was applied on the entire surface of the first lipophilic resin layer with a gravure coater, and the alcohol was volatilized and dried,
A hydrophilic second resin layer mixed with a blue colored indicator was formed.

Then, if necessary, alcohol is used as a solvent on the hydrophilic second resin layer mixed with the above-mentioned indicator.
Alternatively, ethyl cellulose having an alcohol mixture as a solvent was applied to the entire surface to form a surface protective layer, and a water wetting determination sheet having a surface standard color of blue or light blue was obtained.

<Example 3> The standard color of the surface was yellow or pale yellow in the same manner as in Example 1 except that the second resin layer in Example 1 was formed in a pattern pattern by a gravure method. A wetting determination sheet was obtained.

The water wetting determination sheets obtained in Examples 1 to 3 showed no discoloration due to temperature, humidity, etc. under normal environment, and had heat resistance at 70 ° C. for 48 hours. , And 40 ° C x 90% RH (relative humidity) x 48
Moisture resistance in time is good, and by adhering water to the water wetting determination sheet, the acid-base indicator (phenol red) mixed in the hydrophilic synthetic resin of the second resin layer is dissolved, The water-soluble basic powder agent (sodium carbonate) that permeates into the softly modified synthetic resin of the lower lipophilic first resin layer and disperses and mixes in the synthetic resin reacts and reacts, and the second resin layer Changed from blue to red, and the lipophilic first resin layer (transparent layer) in the lower layer was slightly reddish in the surface layer portion to the extent that the color of the underlying substrate sheet was visible.

In this way, the second resin layer changes its color from blue to red, is dissolved by the water attached at the same time, and flows while exhibiting a flow state on the lipophilic first resin layer below it. The hydrophilic second resin layer is irregularly fluidized and peeled off from the lipophilic first resin layer to expose the surface of the first resin layer (transparent layer), and the base sheet is the underlying layer. Color tone (white of pure white roll paper) appeared.

[0044] Incidentally, as pure white roll paper used as the substrate sheet, preferable to use art paper 84.9 g / m ² than with fine paper 64 g / m ² has been found to be moisture resistance is good .

The test results of the water wetting determination sheet obtained in Example 1 are shown in Table 2 below. (The immersion test is based on immersion in tap water for 0.5 seconds.)

[0046]

[Table 2]

The test results of the water wetting determination sheet obtained in Example 1 are shown in Table 3 below. (The immersion test is based on 60 seconds immersion in tap water.)

[0048]

[Table 3]

The test results of the water wetting determination sheet obtained in Example 2 are shown in Table 4 below. (The immersion test is based on immersion in tap water for 0.5 seconds.)

[0050]

[Table 4]

Table 5 below shows the test results of the water-wetting determination sheet obtained in Example 3 above. (The immersion test is based on immersion in tap water for 0.5 seconds.)

[0052]

[Table 5]

[0053]

The water-wetting determination sheet of the present invention comprises a base sheet 1 on which a lipophilic first resin layer 2 in which a vehicle mainly composed of a lipophilic synthetic resin and a hydrophilic powder basic agent are dispersed and mixed. And a hydrophilic second resin layer 3 in which a hydrophilic synthetic resin and a hydrophilic acid-base indicator are mixed on the lipophilic first resin layer 2 in which the basic agent is dispersed and mixed. In particular, since the lipophilic first resin layer 2 uses a lipophilic polymer, water does not permeate into the lipophilic first resin layer at a degree of dew condensation,
It has the property of allowing water to permeate into the lipophilic first resin layer only by the attachment of water droplets.

When water adheres to the water wetting determination sheet,
First, the surface second resin layer 3 and the acid-base indicator contained therein are dissolved in water, and the indicator penetrates into the synthetic resin such as the softly modified polymer of the lipophilic first resin layer 2 as the lower layer. By doing so, the hydrophilic basic agent dispersedly contained in the lipophilic first resin layer 2 is dissolved and reacts with the basic agent to cause discoloration.

The water wetting determination sheet of the present invention has at least a two-layer structure in which the lipophilic first resin layer 2 and the hydrophilic second resin layer 3 are laminated in this order on the base material sheet 1. Therefore, first, the hydrophilic second resin layer 3 on the sheet surface is easily dissolved together with the acid-base indicator by the water attached to the sheet surface, and then the lower lipophilic first resin layer 2 is dissolved.
Of the basic powdery or acidic powdery agent contained in the color change reaction caused by the color reaction, and the hydrophilic second resin layer 3 and the acid base which are easily dissolved and fluidized by water adhering to the sheet surface. The indicator penetrates the lipophilic first resin layer 2 and does not readily penetrate to the base material sheet 1 side, and is retained on the first resin layer 2 for a certain period of time, whereby the first resin layer Second resin layer 3 generated for 2
The fluidizing peeling action of is obtained.

As described above, the portion of the hydrophilic second resin layer 3 which has been discolored by the color reaction on the lipophilic first resin layer 2 and which has been fluidized and peeled off is the first resin layer 2 which is not completely peeled off.
Irregular bleeding remains above, and after the second resin layer 3 is dried, visible traces of water wetting are left on the first resin layer 2.

Further, in the water-wetting determination sheet of the present invention, the lipophilic first resin layer 2 is retained on the base sheet 1 as it is without being fluidized even when wet with water, and the hydrophilic layer on the upper side thereof is kept hydrophilic. When the acid-base indicator in the second resin layer 3 is dissolved by water wetting and fluidized on the first resin layer 2, the acid-base indicator is presented as an alkaline agent or an acid agent mixed in the surface layer portion of the first resin layer 2. It is possible to obtain a state in which the color reaction easily proceeds.

Further, the water-wetting determination sheet of the present invention is unlikely to easily cause bleeding or discoloration with a spontaneously low degree of dew condensation inside the product due to changes in humidity and temperature of the outside air, and the determination sheet Even after drying, the traces of discoloration can be retained, and there is no change over time in discoloration due to water wetting.

[0059]

The water wetting determination sheet of the present invention is attached to a product such as an electric product which needs consideration for water wetting. For example, inside the product (inside the product cover case or inside the product) It is used by attaching or pasting it to the electric wiring part or the electric circuit board, etc., and it does not discolor even if it is slightly wet with water such as natural dew condensation due to climate change or temperature and humidity change of the outside air. Getting wet with water
Water enters the product due to immersion or submersion, regardless of the amount, and discolors when the product gets wet, and the discolored state can be maintained even after the judgment sheet is dried. Objective judgment label regarding the presence or absence of
It is effective as a water wetting judgment sheet such as a seal.

[Brief description of drawings]

FIG. 1A is a side sectional view of an embodiment of the water wetting determination sheet of the present invention, and FIG. 1B is another embodiment in which the second resin layer of the water wetting determination sheet of the present invention is formed in a pattern. It is a side sectional view in.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Base material sheet 2 ... Lipophilic 1st resin layer 2a ... Lipophilic synthetic resin 2b ... Basic or acidic powder agent 3 ... Hydrophilic 2nd resin layer
3a ... Hydrophilic synthetic resin 3b ... Acid-base indicator 4 ... Surface protective layer

─────────────────────────────────────────────────── ─── Continuation of the front page (58) Fields surveyed (Int.Cl. ⁷ , DB name) G01N 31/22 121 G01N 21/78 G01N 33/52

Claims (10)

(57) [Claims] 1. A lipophilic first resin layer 2 in which a water-soluble basic powder agent and / or a water-soluble acidic powder agent is dispersed and mixed in a lipophilic synthetic resin on a base sheet 1, and a hydrophilic layer. And a hydrophilic second resin layer 3 in which a water-soluble or alcohol-soluble acid-base indicator is mixed with the synthetic resin, are sequentially laminated, and the hydrophilic second resin layer 3 is appropriately and partly the lipophilic first resin layer 3. 1
A water-wetting determination sheet, which is laminated on the resin layer 2. 2. A lipophilic first resin layer 2 in which a water-soluble basic powder agent and / or a water-soluble acidic powder agent are dispersed and mixed in a lipophilic synthetic resin on a base sheet 1, and a hydrophilic layer. And a hydrophilic second resin layer 3 in which a water-soluble or alcohol-soluble acid-base indicator is mixed with the synthetic resin, are laminated in this order, and the hydrophilic second resin layer 3 has a water-soluble acidic powder or basic A water-wetting determination sheet, characterized in that a powder is added. 3. A lipophilic first resin layer 2 in which a water-soluble basic powder agent and / or a water-soluble acidic powder agent is dispersed and mixed in a lipophilic synthetic resin on a base sheet 1, and a hydrophilic layer. And a hydrophilic second resin layer 3 in which a water-soluble or alcohol-soluble acid-base indicator is mixed with the synthetic resin, are sequentially laminated, and the hydrophilic second resin layer 3 is appropriately and partly the lipophilic first resin layer 3. 1
The hydrophilic second resin layer 3 is laminated on the resin layer 2 and is formed.
A water-wetting determination sheet, wherein a water-soluble acidic powder or basic powder is added to. 4. A lipophilic first resin layer 2 in which a water-soluble basic powder agent and / or a water-soluble acidic powder agent are dispersed and mixed in a lipophilic synthetic resin on a base sheet 1, and a hydrophilic layer. And a hydrophilic second resin layer 3 in which a water-soluble or alcohol-soluble acid-base indicator is mixed with the above synthetic resin, the lipophilic synthetic resin is chlorinated polypropylene, and the hydrophilic synthetic resin is Is a water-wetting determination sheet characterized by being ethyl cellulose. 5. The water wetting determination sheet according to any one of claims 1 to 3, wherein a hydrophilic transparent surface protective layer 4 is laminated on the hydrophilic second resin layer 3. A water-wetting determination sheet characterized in that 6. The water-wetting determination sheet according to claim 4, wherein a hydrophilic transparent surface protective layer 4 is laminated on the hydrophilic second resin layer 3. Sheet. 7. The water-wetting determination sheet according to claim 1, 2 or 3 or 5, wherein the lipophilic synthetic resin is chlorinated polypropylene and the hydrophilic synthetic resin is ethyl cellulose. Characteristic water wetting judgment sheet. 8. A lipophilic first resin layer 2 obtained by dispersing and mixing a water-soluble basic powder agent and / or a water-soluble acidic powder agent in a lipophilic synthetic resin on a base sheet 1, and a hydrophilic layer. And a hydrophilic second resin layer 3 in which a water-soluble or alcohol-soluble acid-base indicator is mixed with the above synthetic resin, and the lipophilic synthetic resin is a saturated polyester resin (polyethylene terephthalate) or an unsaturated polyester resin. , polyvinyl chloride, vinyl chloride - vinyl acetate copolymer, polystyrene resin, polyethylene resin, polypropylene resin, the group consisting of acrylic resin (polymethyl methacrylate)
A water-wetting determination sheet, which is a non-water-soluble synthetic resin selected from the following, or a soft elastomeric synthetic resin such as a soft modified polymer (softly modified polymer). 9. The water-wetting determination sheet according to claim 8, wherein the soft elastomer synthetic resin is chlorine such as chlorinated polyethylene or chlorinated polypropylene having a chlorinated polymer such as chlorinated polyolefin as a soft segment. A water-wetting determination sheet, which is a functionalized polymer elastomer, a polystyrene elastomer, a polyolefin elastomer, a polyester elastomer, a polyamide elastomer, a polyurethane elastomer, a fluorine elastomer, or an ion-crosslinked elastomer. 10. The water wetting determination sheet according to claim 8, wherein the soft modified polymer constituting the soft elastomer synthetic resin is chlorinated polyethylene, chlorinated polypropylene, or polyisoprene, polybutadiene,
Saturated polybutadiene, polyester, polyether,
A water-wetting determination sheet characterized by being a soft segment such as amorphous polyvinyl chloride, amorphous polyethylene, ethylene propylene rubber, or fluorine rubber.