JP2001199012A - Packing film - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a packing film having high storage stability in high humidity environment and having good feel for touch by band and a package comprising the same. SOLUTION: In a packing film wherein a layer containing a hydrolyzable material (hereinbelow referred to as 'fixture layer'), the basis weight (a weight per a unit area) of the fixture layer is 10 g/m2 or less and a multiplied value of the basis weight of the packing film and the moisture permeability thereof is 2,000 (g/m2h.g/m2) or less. An object to be packed is covered with the packing film and the peripheral part of the packing film is sealed to form a package.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a packaging film and a package having the function of dissolving or hydrolyzing the film when the film comes into contact with water or the like, and having the function of releasing the packaged product.

[0002]

BACKGROUND OF THE INVENTION Foods,
In applications such as pharmaceuticals, agricultural chemicals, household goods, and sanitary goods, proposals have been made to package contents with a water-soluble film and release the contents by dissolving the water-soluble film during use or disposal. is there.

For example, a water-soluble film is disclosed in
Japanese Patent Application Laid-Open No. Hei 3-197157 discloses a method in which sodium chloride is preliminarily mixed with a water-soluble polymer so that sodium chloride is uniformly arranged on a film to make the seasoning uniform. A water-insoluble polymer is blended in advance with a water-soluble polymer to control the release of a drug.
It was unbearable for long-term storage and storage in a high-humidity environment, and required separate packaging. In particular, when stored in a high-humidity environment, the contents were unwound, and when stacked, the films stuck together. There was also a sticky feel when touched with wet hands, and the feel was not satisfactory.

[0004] If the thickness of the water-soluble film is simply increased or the composition of the water-soluble film is made low in moisture permeability for these improvements, the water-soluble film becomes difficult to dissolve and takes a long time to dissolve in water or the like. Was not obtained.

[0005] An object of the present invention is to provide an initial bag-breaking time suitable for the purpose, high long-term storage stability, improved exudation of the contents even during storage in a high-humidity environment, and adhesion of packaging films. An object of the present invention is to provide a packaging film and a package having no stickiness and having a good touch when touched with a wet hand.

[0006]

SUMMARY OF THE INVENTION The present invention relates to a packaging film comprising a water-soluble film substrate and a layer containing a water-disintegrable material (hereinafter referred to as a "fixing layer"). The basis weight (weight per unit area) (B) of the material layer is 1
0 g / m ² or less, and the value (C · E) obtained by multiplying the basis weight (C) of the packaging film by its moisture permeability (E) is 20.
Provided is a packaging film having a thickness of 00 (g / m ² h · g / m ² ) or less, and a package covered with the packaging film, wherein the peripheral portion of the film is sealed. I do.

[0007]

BEST MODE FOR CARRYING OUT THE INVENTION <Water-soluble film substrate> The water-soluble film substrate preferably has a basis weight (A) of 10 g / m ² or more from the viewpoint of achieving the strength of a packaging film and the initial bag-breaking time. And 15 to 100 g / m ² are more preferable. The thickness is preferably 9 μm or more, more preferably 13 to 90 μm.

Here, "water-soluble" in the water-soluble film substrate means that 1 part by weight of a sample is dissolved in 99 parts by weight of water (5
The stirring conditions at 60 ° C. for 60 minutes are as described in the evaluation method “(1) Solubility at 5 ° C.” in Examples), and the solubility refers to 80% by weight or more, more preferably 90% by weight or more.
The solubility was determined by dissolving the sample and filtering the aqueous solution using filter paper (No. 2).
And calculated from the solid content in the filtrate. The sample is in the form of a water-soluble film, which is the base material of the packaging film.

As the water-soluble polymer used for the water-soluble film substrate, polyvinyl alcohol and / or a derivative thereof (itaconic acid-modified polyvinyl alcohol, sulfonic acid-modified polyvinyl alcohol, maleic acid-modified polyvinyl alcohol, etc.), poly (meth) acrylic acid Alkali salts,
Alkali salts of (meth) acrylic acid / (meth) acrylic acid ester copolymer, alkali salts of (meth) acrylic acid / maleic acid copolymer, synthetic products such as polyvinylpyrrolidone; methylcellulose, ethylcellulose, sodium carboxymethylcellulose, hydroxy Semi-synthetic products such as alkylcellulose and starch derivatives; natural polymers such as starch, gelatin, agar, seaweed, plant mucilage, protein and the like. Among these, polyvinyl alcohol and / or a derivative thereof (such as itaconic acid-modified polyvinyl alcohol, sulfonic acid-modified polyvinyl alcohol, and maleic acid-modified polyvinyl alcohol) are particularly preferably used.

<Water decomposable material> The water decomposable material of the present invention is prepared by dissolving 1 part by weight of a sample in 99 parts by weight of water (5 ° C., 60 ° C.).
And stirring conditions are as described in the evaluation method “(1) Solubility at 5 ° C.” in Examples). When the solubility is 70% by weight or less, it is preferably 50% by weight or less, more preferably 40% by weight. The following are particularly preferred. As the water-decomposable material, a fine inorganic or organic substance having such properties is used.

Examples of the inorganic substance include zeolite, bentonite, talc, mica, kaolin, sepiolite, silica, silicone, calcium carbonate, titanium oxide, silicic acid anhydride, hydroxy-calcium-apatite, and pearls. Talc, mica, kaolin, silica, silicone and the like are more preferably used.

As organic substances, polyethylene, polypropylene, polyamide, polyethylene terephthalate, polystyrene, polyethylene vinyl alcohol and polyurethane and / or their cross-linked products, vinyl acetate and / or their derivatives, sodium poly (meth) acrylate and poly (meth) ) In addition to acrylates and / or their crosslinked products, ethylene rubber, propylene rubber, styrene-
Rubbers such as butadiene rubber, butadiene rubber, silicone rubber and / or synthetic polymers such as cross-linked products thereof; cellulose and / or derivatives thereof (nitrocellulose), chitosan and / or derivatives thereof, starch, pulp, fruit shell And the like and / or derivatives thereof. Of these, resins having low moisture permeability are preferred, but those having low moisture permeability tend to have poor water dissolution, and particularly, polyethylene, polyamide, polystyrene, polyurethane, poly (meth) Sodium acrylate, poly (meth) acrylate, cellulose and / or a derivative thereof (nitrocellulose) and the like are preferably used. Here, “poly (meth) acrylic acid” means both “polyacrylic acid” and “polymethacrylic acid”.

It is more preferable to use a mixture of two or more of these organic substances. For example, polyethylene, polyamide, polystyrene, polyurethane, sodium poly (meth) acrylate, poly (meth) acrylate and nitrocellulose are used in an amount of 10 to 80%. By mixing by weight%, a high water dissolution can be obtained.

When the water-disintegrable material is in the form of powder, the average particle diameter is preferably 300 μm or less from the viewpoint of the feeling of the packaging film and the prevention of the powder particles falling off the film.
μm or less is more preferable.

When the water-disintegrable material has a fibrous form, the fiber length is preferably 10 μm to 6 mm, and more preferably 20 μm, from the viewpoint of the feel of the packaging film and the handling properties during the production of the film.
~ 5 mm is more preferred.

In the case where the water-disintegrable material is paper or non-woven fabric, from the viewpoint of the touch when the packaging film is touched by hand and the water-disintegrability,
The basis weight is preferably 1 to 10 g / m ² , and 1 to 5 g / m ²
Is more preferred.

The water-disintegrable material is a true sphere, a substantially sphere, a flat plate,
A rod-like, fibrous, sheet-like material such as paper or non-woven fabric is preferably used, and a deformed shape by pulverization or the like may be used, and hollow or porous particles may also be used.

Further, two or more kinds of water decomposable materials may be used. By using a mixture of two or more of resinous and powdery or fibrous materials as a water-disintegrable material, the moisture permeability is low, while maintaining the water-solubility and water-decomposability of the water-soluble film substrate, without stickiness, It has a good feel and is excellent in usability.

The water-decomposable material is a water-soluble film substrate 100
It is preferably used in an amount of 0.1 to 80 parts by weight, more preferably 0.3 to 70 parts by weight, based on parts by weight.

<Production method of packaging film> The packaging film of the present invention is prepared by coating, printing, spraying, spraying or the like.
A) water-decomposable material or b) on the water-soluble film substrate surface
It is obtained by fixing a mixture of a water-decomposable material and a water-soluble polymer to form a fixing layer. Specifically, for example, a water-disintegrable material dispersed or dissolved in an organic solvent or the like is applied or printed on the surface of a previously prepared water-soluble film substrate. As the coating or printing method, for example, a coating method such as gravure coating, roll coating, flow coating, or kiss coating, or a printing method such as gravure printing or flexographic printing is preferably used. Here, as described in the above item b), when the water-disintegrable material and the water-soluble polymer are mixed and used, the amount of the water-soluble polymer is preferably 1 to 100 parts by weight based on 100 parts by weight of the water-disintegrable material. Parts, more preferably 5 to 50 parts by weight. Examples of the water-soluble polymer include those described in <Water-soluble film substrate>. From the viewpoint of the solubility of the packaging film and the size of the hydrolyzate after dissolution, it is necessary that the basis weight of the fixing layer is 10 g / m ² or less.

In this case, the organic solvent is preferably one that does not dissolve the water-soluble film substrate, and alcohols such as methanol, ethanol and propanol depending on the type of water-soluble polymer constituting the water-soluble film substrate;
-Petroleum solvents such as hexane, cyclohexane, heptane, octane, toluene and xylene are used. The amount of the organic solvent is preferably 0.5 to 20 times the total weight of the fixing layer.

These organic solvents are removed by a method such as drying after fixing the water-decomposable material on the surface of the water-soluble film substrate.

For the purpose of ensuring the fixability of the water-decomposable material to the water-soluble film substrate, water, glycols such as ethylene glycol, diethylene glycol, triethylene glycol and polyethylene glycol; glycerin, polyglycerin, Plasticizers such as polyhydric alcohols such as trimethylolpropane and pentaerythritol may be added. The amount of the plasticizer added is 100
It is preferably from 1 to 100 parts by weight, more preferably from 3 to 60 parts by weight, based on parts by weight.

In the production method of the present invention, an additive such as a thickener can be used to improve the dispersibility of the water-decomposable material in an organic solvent. Ethyl cellulose, hydroxypropyl cellulose and oil-soluble polymers are preferably used as the thickener. The addition amount of such a thickener is preferably from 0.1 to 10% by weight based on the weight of the hydrolyzable material.

<Other Additives> In addition to a water-decomposable material, a water-soluble polymer and a plasticizer, additives such as a releasing agent, an anti-blocking agent, a solubility improver, A coloring component or the like can be added.

As a release agent, a nonionic surfactant such as polyoxyethylene alkyl ether, polyoxyethylene alkyl phenyl ether, polyoxyethylene polyoxypropylene glycol, polyoxyethylene polyoxypropylene alkyl ether, alkyl trimethyl ammonium chloride, chloride A cationic surfactant such as dialkyldimethylammonium is preferably used.

The amount of the release agent to be added is preferably 0.1 to 5 parts by weight based on 100 parts by weight of the water-soluble polymer in the fixing layer, from the viewpoints of releasability, film formability and strength.

As the blocking inhibitor, inorganic substances such as bentonite, talc, kaolin and zeolite, and organic substances such as starch and cellulose powder are preferably used. The addition amount of these antiblocking agents is preferably 1 part by weight or less based on 100 parts by weight of the water-soluble polymer of the fixing layer from the viewpoint of handling properties and productivity.

As the solubility improver, a water-soluble inorganic salt, a water-soluble organic salt, a water-insoluble inorganic substance, and a water-insoluble organic substance can be added to the fixing layer. Chlorides such as sodium chloride, potassium chloride and magnesium chloride as water-soluble inorganic salts;
Sulfates such as sodium sulfate, potassium sulfate, magnesium sulfate, and aluminum sulfate; carbonates such as sodium carbonate and sodium hydrogen carbonate; and the like, and water-soluble organic salts include citrate, succinate, maleate, and fumarate. Acid salts, malates and the like, fatty acid soaps, ester phosphates, acylated amino acid salts, sulfosuccinates and the like, and water-insoluble inorganic substances such as bentonite, talc, kaolin and zeolite. Examples of the water-insoluble organic substance include cellulose powder and starch.

The addition amount of these solubility improvers is preferably 1 to 30 parts by weight based on 100 parts by weight of the water-soluble polymer in the fixing layer in order to improve the solubility of the packaging film.

These additional components can also be used for a water-soluble film substrate.

<Moisture Permeability> The moisture permeability is measured in accordance with JIS Z0208 (cup method) when the sample is stored at 30 ° C. and 90% RH for 1 hour. The value obtained by multiplying the moisture permeability by the basis weight means a value converted to a basis weight of 1 g / m ² .
Here, the number of samples was n = 3, and the average value was obtained.

The moisture permeability (E) of the packaging film is 80 g /
m^TwoH or less, preferably 50 g / m ^Two・ H and below are more preferable
New

<Preferred Form of Packaging Film> Fixation
If the basis weight (B) of the layer is too large, the initial bag breaking time becomes longer.
10g / m ^TwoMust be less and preferred
5g / m^TwoIt is as follows. Sufficient moisture permeability, storage stability
0.05g / m^TwoAbove is preferred
No. The basis weight (C) of the packaging film and its moisture permeability
The value (CE) multiplied by (E) is the water-soluble filter.
Of the effect of reducing the moisture permeability of the fixing material layer compared to the base material alone
2000 (g / m^Twoh · g / m^Two)
Is required, preferably 1800 (g / m^Twoh ・ g /
m^Two) This value is preferably lower, but
If it is too low, the initial bag breaking time tends to be long,
(G / m^Twoh · g / m^TwoIs preferred.

The value (CE) obtained by multiplying the basis weight (C) of the packaging film by its moisture permeability (E) is the basis weight (A) of the water-soluble film substrate and its moisture permeability (D). And the difference is 100 (g / m).
It is preferable that the water-decomposable material has a moisture permeability lower than that of the water-soluble film base material when it is at least ² h · g / m ² ). More preferably, the difference is 200 (g / m ² h · g /
m ² ).

When the packaging film was brought into contact with water at 5 ° C. (at 5 ° C. for 60 minutes, stirring conditions were as described in the evaluation method “(1) 5 ° C. solubility” in Examples). In the hydrolyzable material peeled from the packaging film into water (hereinafter, referred to as “hydrolyzate”), a hydrolyzate having a longest diameter of 200 μm or less accounts for 8% of the total hydrolyzate.
It is preferably at least 0% by weight, more preferably at least 90% by weight. In this case, the longest diameter 2
The ratio of the hydrolyzate of 00 μm or less is the nominal size (opening) 2
By using a 00 μm stainless mesh and filtering the hydrolyzate, and measuring the solid content weight of the filtrate,
Desired.

When the packaging film of the present invention is used for packaging a detergent or the like, the initial bag breaking time with cold water at 5 ° C. is 1 second to
Twenty minutes is preferred, and more preferably one second to two minutes.
Conversely, in the case of waste such as sanitary goods, 1 hour to 72 hours is preferable.

The packaging film of the present invention has a form in which a layer containing a water-decomposable material is present on the surface of a water-soluble film base material. Processing can also be performed.

The film of the present invention can be provided with an embossed pattern on the surface by embossing. The embossing may be performed after the formation of the water-soluble film substrate or after the treatment with the water-disintegrable material.

<Package> The package according to the present invention can be obtained by covering an object to be packaged with the above-mentioned packaging film and sealing the peripheral portion of the film. Examples of the articles to be packaged include detergents and sanitary articles, and detergents are preferred.

When the object to be packaged is a detergent, there are non-liquid detergents such as powder detergents and powder bleaching agents, paste-like detergents, liquid detergents and the like, and these items to be packaged are packaged in the packaging film according to the present invention. Can be used. At the time of packaging, the film can be partially or entirely used to obtain a packaging detergent.

[0042]

EXAMPLES Production Example (Production of Water-Soluble Film) 1500 g of T-330 (maleic acid-modified polyvinyl alcohol, manufactured by Nippon Synthetic Chemical Industry Co., Ltd.), 8500 g of water, and glycerin as a plasticizer (Wako Pure Chemical Industries, Ltd.) 200 g) and 15 g of Emulgen 135 (a nonionic surfactant, manufactured by Kao Corporation) as a release agent are dissolved and defoamed, and then dried on hot air at 140 ° C. while casting on a 120 ° C. drum (dry residence time) 2 minutes), and a long water-soluble film (F-1) having a thickness of 20 μm and a long water-soluble film (F-
2) was obtained.

Example 1 While unwinding the water-soluble film (F-1), a cellulose powder (W-400G, average fiber length) was obtained using a gravure coating machine (Gravure roll 100 mesh, manufactured by Hirano Rexide Co., Ltd.).
27 μm, 50 g of Nippon Paper Industries Co., Ltd., 20 g of polyamide resin (Reomide S8000, manufactured by Kao Corporation, the same applies hereinafter), and nitrocellulose resin (CD220, manufactured by Asahi Kasei, the same applies hereinafter) 3
g, 400 g of isopropyl alcohol (manufactured by Wako Pure Chemical Co., Ltd .; the same applies hereinafter) and 400 g of ethyl acetate (manufactured by Wako Pure Chemical Co., Ltd .; the same applies hereinafter) as a solvent while stirring.
Coated. Subsequently, hot air drying was performed at 110 ° C. for 20 seconds. Thus, a packaging film in which cellulose powder, polyamide resin and nitrocellulose resin were fixed on the water-soluble film substrate was obtained. The basis weight of the fixing layer was 5 g / m ² .

Example 2 While unwinding the water-soluble film (F-1), using a gravure printing machine (Gravure roll 200 mesh, manufactured by Hirano Lecce Co., Ltd.), polyamide resin 80 g, isopropyl alcohol 400 g, ethyl acetate 400 g Was applied with stirring. Subsequently, hot air drying was performed at 110 ° C. for 20 seconds.
Thus, a packaging film in which the polyamide resin was fixed on the water-soluble film substrate was obtained. The basis weight of the fixing layer is 0.5 g
/ M ² .

Example 3 In Example 2, the amount of polyamide resin was changed to 40 g, and polyvinylpyrrolidone (K-60, manufactured by Wako Pure Chemical Industries, Ltd.)
Was performed in the same manner as in Example 2 except that
A packaging film was obtained. The basis weight of the fixing layer was 1 g / m ² .

Example 4 A packaging film was obtained in the same manner as in Example 2 except that 3 g of nitrocellulose resin was further added. The basis weight of the fixing layer was 0.5 g / m ² .

Example 5 In Example 4, 80 g of the polyamide resin was changed to 80 g of a polyurethane resin (UR8300, manufactured by Toyobo Co., Ltd.), and 400 g of isopropyl alcohol, 200 g of ethyl acetate, and methyl ethyl ketone (manufactured by Wako Pure Chemical Industries, Ltd.) were used as solvents. Except for using 200 g, the same operation as in Example 4 was performed to obtain a packaging film. The basis weight of the fixing layer was 2 g / m ² .

Example 6 While a water-soluble film (F-1) was unwound, a silicone-based coating agent (Tosgard 51 was used) with a gravure coating machine (Hirano Lecce Co., Ltd., gravure roll 400 mesh).
0, effective content 15%, manufactured by Toshiba Silicone Co., Ltd.). Subsequently, hot air drying was performed at 100 ° C. for 20 seconds. As a result, a packaging film in which silicone was fixed on the water-soluble film substrate was obtained. The basis weight of the fixing layer was 0.5 g / m ² .

Comparative Example 1 A gravure roll of 100 mesh was used in Example 4 to obtain a fixing layer having a basis weight of 13 g / m ² .

Comparative Example 2 The water-soluble film (F-2) was used as a comparative sample.

Comparative Example 3 The water-soluble film (F-1) was used as a comparative sample as it was.

Table 1 shows the films obtained in Examples 1 to 6 and Comparative Examples 1 to 3, the water-soluble film base material constituting the films, the basis weight and the moisture permeability of the fixing layer, and the like. Table 2 shows the results of evaluating the films obtained in Examples 1 to 6 and Comparative Examples 1 to 3 by the following methods.

<Evaluation Method> (1) Solubility at 5 ° C. Two pieces of a film were cut into 5 cm squares, and the four corners were stuck together with an adhesive tape so that the processed surface was outside, and the diameter was further 3 cm.
The sample is sandwiched between two 5 cm square plates with holes. Charge 1 L of ion-exchanged water into a 1 L beaker, adjust the temperature to 5 ° C, immerse the sample vertically at a position where the upper part of the measurement sample is about 1 cm deep from the water surface while gently stirring (250 rpm) with a stirrer. The time when the film began to tear was defined as the initial bag break time. The time during which the film was completely dissolved by visual observation, or the time when the water-insoluble component was completely dispersed or disintegrated, was defined as the complete bag breakage time.

The solubility and the longest diameter of the packaging film are 2
The ratio of the hydrolyzate having a size of 00 μm or less was measured by the method described above.

(2) Feeling Assuming that the film is individually wrapped, 30 ° C., 80% RH
After one day of storage under the environment described above, the entire palm was touched on the film and subjected to a sensory evaluation. The evaluation is based on a five-point scale evaluated by five persons and rounded to the first decimal place. 5: Very good feeling, 4: Good feeling, 3: Medium, 2: Slightly sticky, 1: Sticky large.

(3) Blocking property Assuming that the film is individually wrapped, 25 ° C., 50% RH
After storing for 1 day in the environment described above, the film was cut into 8 x 12 cm, and the composite surfaces at the time of film creation were overlapped with each other, and 2 kg / cm ²
After applying a load of 10 seconds, the blocking property between the films was evaluated. Twenty samples were measured, the following scores were given, and the average value (rounded to the first decimal place) was calculated.

5: No blocking at all 4: Sound is slightly generated when the film is peeled off, but no blocking 3: Very slight (about 5% in area ratio) blocking 2: Area ratio 10 to 50% blocking 1: Overall (4) Long-term storage bleeding property: A garment detergent for sheet-like clothing is manufactured by the following method, and the content is stained when stored in this form in an environment of 20 ° C. and 50% RH for 6 months. The dispensing property was visually evaluated according to the following criteria.

◎: No exudation ○: Very slight exudation (5) Storage stability in a high humidity environment A detergent for sheet-like clothing was manufactured by the following method. The exudation, change in appearance, and blocking property when stored for 3 months in an environment were evaluated according to the following criteria.

◎: good condition without change compared to before storage ：: relatively good condition with change compared to before storage ：: bad condition with change compared to before storage <Production method of detergent for sheet-like clothing> According to the method of Example 1 of JP-A-10-72599, the following sheet-like detergent was prepared and evaluated.

25 g of dodecyldimethylamine oxide from which water had been removed in advance by a microwave oven, 10 g of polyoxin ethylene (7) alkyl (C12 to C15) ether sulfate sodium salt (“Nonidet R-7” manufactured by Mitsubishi Chemical Corporation), C12-C14 2nd
Grade alcohol polyoxyethylene (7) polyoxypropylene (4.5) glycol (Nippon Shokubai Chemical Co., Ltd. "Sophthanol EP7045") 5 g, A4 zeolite (Toyo Soda Co., Ltd.) 40 g, acrylic acid-maleic acid co-polymer Combined K salt
(Molecular weight 60000) 4g, soda ash 8g, polypropylene glycol (molecular weight 1000) 2.5g, "Tixolox 25"
(Cofuran Chemical Co., Ltd.) 3 g, d-limonene 0.2 g, protease ("API-21" manufactured by Showa Denko KK) 0.9 g, cellulase (Novo Industry Co., Ltd. "Cellzyme 1.0")
T)), 0.9 g of amylase ("Tamamil 6.0T" manufactured by Novo Industries), 0.2 g of lipase ("Lipolase 100T" manufactured by Novo Industries), and 0.2 g of fluorescent dye ("Tinopearl CBX-X" manufactured by Ciba-Gaiky). Mixing by hand gave a dough.

The obtained dough is stretched to a thickness of 2 mm, and
The film was cut into a size of 13 cm, sandwiched between two films obtained in Examples and Comparative Examples (composite surface was set as an outer surface), and heat-sealed to obtain a detergent for sheet-like clothing.

[0062]

[Table 1]

[0063]

[Table 2]

Example 7 Dough was obtained by the method described in the above section <Method for producing detergent for sheet-like clothing>. The obtained dough is stretched to a thickness of 2 mm,
Cut to 7cm x 13cm, film 2 obtained in Example 1
The sheet was sandwiched between the sheets (the composite surface was the outer surface) and heat-sealed to obtain a sheet-like clothing detergent.

Thirty sheets of the obtained sheet-like clothing detergent were laminated and stored in an environment of 30 ° C. and 80% RH. There was no change in appearance before and after storage, and no blocking was observed. There was no stickiness when touched by hand, and the film was also excellent in feel. A washing test was conducted with tap water at 5 ° C. in accordance with the solubility measurement method described in JP-A-11-124600. As a result, no film residue was found.

[0066]

According to the present invention, not only water solubility and water dissolving property are excellent, long-term storage and storage in a high humidity environment are possible, but also no stickiness when touched by hand,
It is possible to provide a packaging film and a package excellent in the feel. Also, hydrolyzate does not hinder drainage at all.

Continued on the front page (51) Int.Cl. ⁷ Identification symbol FI Theme coat II (reference) // C08L 101: 00 C08L 101: 00 (72) Inventor Yoshihiro Sakai 2606 Kabanecho, Akabane, Haga-gun, Tochigi Pref. Research by Kao Corporation In-house F-term (reference) 3E067 AA03 AA04 AA05 AA11 AB01 AB81 AB83 BA12A BB14A BB22A BB25A BB30A CA23 CA24 EA04 EE32 3E086 AA02 AB01 AD01 BA04 BA15 BB51 BB72 CA28 CA35 4F006 AA19 AB03 AB01 AB03 AB04 BA02 CA04 CA30 HB21 JA13B JB05B JB09A JD04 JJ04 JK01 JL00 YY00B

Claims (7)

[Claims] 1. A water-decomposable material on a surface of a water-soluble film substrate.
(Hereinafter referred to as “fixing material layer”)
Wrapping film, and the basis weight (unit area) of the fixing layer
Per weight) (B) is 10 g / m^TwoBelow, for packaging
Multiply the basis weight (C) of the film by its moisture permeability (E)
2000 (g / m) ^Twoh · g / m^Two)
The packaging film below. 2. The value (CE) obtained by multiplying the basis weight (C) of the packaging film by its moisture permeability (E) is the basis weight (A) of the water-soluble film substrate and its moisture permeability (E). D) is smaller than the value (A · D) multiplied by
m ² h · g / m ² ) or more. 3. An initial bag breaking time with cold water of 5 ° C. is 1 second or more.
3. The packaging film according to claim 1, which is 20 minutes. 4. When a packaging film is brought into contact with water at 5 ° C., the longest diameter of the water-disintegrable material (hereinafter referred to as “hydrolyzate”) peeled from the packaging film into water is 200.
The packaging film according to any one of claims 1 to 3, wherein a hydrolyzate having a size of not more than μm accounts for 80% by weight or more of the total hydrolyzate. 5. The method according to claim 1, which has an emboss pattern.
The film for packaging according to any one of the above items. 6. A package in which an object to be packaged is covered with the packaging film according to claim 1, wherein a peripheral portion of the film is sealed. 7. The package according to claim 6, wherein the package is a detergent.