JP3061559B2 - Water-soluble laminated film and water-soluble bag - 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-soluble laminated film and a water-soluble bag which are used by pouring a drug into water while being packed and filled.

[0002]

2. Description of the Related Art Water-soluble films and bags are used for packaging and filling chemicals such as detergents, cleaning agents, bactericides, insecticides, herbicides, fertilizers, dyes and toilet blocks. If you use this water-soluble film or water-soluble bag,
Without opening and taking out the drug, the drug can be dissolved and dispersed in water simply by putting it in cold water. Therefore, it is suitable for the use of powdered chemicals that may scatter and contaminate the working environment. If the amount of chemicals is measured in advance and filled in a film or bag, it is easy to use a single amount of chemicals. Has attracted attention as an effective packaging form.

As the water-soluble film, a film made of a natural resin or a synthetic resin such as pullulan, a polyvinyl alcohol resin, a polyethylene oxide resin, a cellulose derivative, polyvinyl ether, and polyvinylpyrrolidone is known. Above all, a film made of a polyvinyl alcohol-based resin obtained by saponifying a polyvinyl acetate-based resin is often used because it is easy to handle and has high gas barrier properties and fragrance retention.

[0004]

However, these water-soluble films and water-soluble bags have low moisture-proof properties and their water content is easily changed with changes in environmental humidity. And performance such as fragrance retention will be reduced. For this reason, when a drug containing a strong fragrance is filled, the fragrance of the drug leaks out even if it is sealed, and the scent shifts to the hand when held by hand, or the scent shifts to other products and the product value Often fell.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems, and has a high moisture-proof property, and is capable of leaking fragrance to the outside even if a fragrant drug is packed and filled without being affected by changes in environmental humidity. It is an object of the present invention to provide a water-soluble film and a water-soluble bag which are free of water.

[0006]

Water-soluble laminated film Means for Solving the Problems] The present invention has been made in order to achieve the object of consists of at least one kind selected from the polyvinyl alcohol-based resin and a cellulose derivative-based resins film On at least one side, a metal deposition layer or a metal oxide deposition layer having a thickness of 50 to 500 Å is formed.

[0007] water-soluble bag of the present invention made in order to achieve the object is a bag composed of at least one kind selected from the polyvinyl alcohol-based resin and cell <br/> cellulose derivative-based resins, thickness A metal deposited layer or a metal oxide deposited layer having a thickness of 50 to 500 Å is formed.

It is preferable that the metal deposited layer is an aluminum deposited layer and the metal oxide deposited layer is a silicon oxide deposited layer or an alumina deposited layer.

When the thickness of the layer is less than 50 angstroms, the moisture-proof property is inferior, and sufficient scent retention cannot be obtained. When the thickness exceeds 500 angstroms, it takes a long time to dissolve, which is not practical in terms of economy.

The polyvinyl alcohol resin is partially saponified polyvinyl alcohol having a saponification degree of 70 to 98 mol% and a polymerization degree of 300 to 3000, vinyl acetate and allyl acetate, maleic acid, phthalic acid, acrylic acid, methacrylic acid, itaconic acid or Saponified product in which the vinyl acetate component of the copolymer with α-olefin is saponified, partially esterified polyvinyl alcohol in which maleic anhydride, phthalic anhydride or succinic anhydride is bonded to polyvinyl alcohol, and crotonaldehyde to polyvinyl alcohol , Butyraldehyde, furfural or partially acetalized polyvinyl alcohol condensed with an aldehyde of acrolein.

Examples of the cellulose derivative resin include methylcellulose, hydroxypropylmethylcellulose, hydroxyethylmethylcellulose, and sodium carboxymethylcellulose, which have high cold water solubility.

[0012]

The thickness of the film made of these resins is 1
0 to 150 μm is preferred. If the thickness is less than 10 μm, the moldability is poor, and if it exceeds 150 μm, it takes a long time to dissolve, which is not practical in terms of economy.

[0014] The polyvinyl alcohol-based resin or a cell <br/> cellulose derivative-based resins in a plasticizer, a surfactant, pigments, dyes, inorganic fillers, additives starch may be contained.

[0015] The water-soluble laminated film is produced as follows. Solution casting at least one kind selected from the polyvinyl alcohol-based resin and cellulose <br/> scan derivative-based resins, into a film by a known method such as water-containing melt-extrusion method, then aluminum, silicon oxide or Alumina is evaporated by high frequency induction heating, radiant heating or electron beam impact heating in a vacuum evaporation apparatus to deposit on the film to obtain a water-soluble laminated film. The water-soluble bag is produced by making the films of the water-soluble laminated film into an inner surface by heat sealing or the like.

[0016]

When the water-soluble laminated film and water-soluble bag of the present invention are packaged, filled and sealed with a strong fragrant drug, the fragrance of the drug is blocked by a metal deposited layer or a metal oxide deposited layer even when the drug passes through the film. Therefore, the scent does not leak out of the bag. Since the metal vapor deposition layer or metal oxide vapor deposition layer is vapor-deposited on the film in a scaly shape, if the drug is packed in a water-soluble laminated film and a water-soluble bag and put into cold water while being filled, the original water solubility of the film will be reduced. Without loss
It dissolves easily and the drug dissolves and disperses in water.

[0017]

The water-soluble laminated film and water-soluble bag of the present invention have excellent solubility when placed in cold water, have high moisture-proof properties, and are not affected by changes in environmental humidity even when filled with a fragrant drug. Therefore, the gas barrier property and the fragrance retention property do not decrease and the scent does not leak outside. Therefore, even when a product having a strong fragrance packed and filled in a water-soluble laminated film or a water-soluble bag is handled as a product, the scent does not transfer to hands or other products.

[0018]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, representative embodiments of the present invention will be described. Example 1 A 40 μm thick polyvinyl alcohol film (“Sorblon KC # 40” manufactured by Aicello Chemical Co., Ltd.) was coated on one side with a vacuum deposition apparatus at a vacuum degree of 10 −4 Torr and a vapor deposition rate of 400 m /
Under conditions of min, aluminum was deposited to form an aluminum layer having a thickness of 100 angstroms to obtain a water-soluble laminated film. A 6 cm square bag was prepared using this film so that the aluminum layer was on the outer surface, and a water-soluble bag was obtained.

In the obtained water-soluble bag, add a fragrance (“Fr
agrance BA-8601 ”), sealed by heat sealing, and left in an atmosphere of a temperature of 20 ° C. and a humidity of 80% to perform a performance test. As a result, the fragrance did not leak out of the bag even after 10 days, and the shape of the bag did not change.

Example 2 Itaconic acid-modified polyvinyl alcohol ("KM" manufactured by Kuraray)
-118 ") An aqueous solution in which 100 parts by weight and 15 parts by weight of glycerin were dissolved in 900 parts by weight of water was cast on a drum,
The film was dried at a temperature of 80 ° C. to produce a film having a thickness of 40 μm. On one side of the obtained film, using a vacuum deposition apparatus, at a degree of vacuum of 10 -4 Torr and a deposition rate of 200 m / min,
Aluminum was deposited to form an aluminum layer having a thickness of 300 Å to obtain a water-soluble laminated film. A 6 cm square bag was prepared using this film so that the aluminum layer was on the outer surface, and a water-soluble bag was obtained.

A performance test was performed on the obtained water-soluble bag in the same manner as in Example 1. As a result, the fragrance did not leak out of the bag even after 10 days, and the shape of the bag did not change.

Example 3 Polyethylene oxide ("POL" manufactured by Union Carbide)
YOX WSR N-750 ")
An aqueous solution dissolved in 0 parts by weight was cast on a drum,
The film was dried at 40 ° C. to produce a film having a thickness of 40 μm. On one side of the obtained film, using a vacuum deposition apparatus, a silicon oxide layer was formed by depositing silicon oxide at a degree of vacuum of 10 -4 Torr and a deposition rate of 300 m / min to form a silicon oxide layer having a thickness of 200 Å. A water-soluble laminated film was obtained. A 6 cm square bag was prepared using this film so that the silicon oxide layer was on the outer surface, and a water-soluble bag was obtained.

A performance test was performed on the obtained water-soluble bag in the same manner as in Example 1. As a result, the fragrance did not leak out of the bag even after 10 days, and the shape of the bag did not change.

Example 4 100 parts by weight of hydroxypropyl methylcellulose ("Metroze 60SH-50" manufactured by Shin-Etsu Chemical) and polyethylene glycol ("PEG 200" manufactured by Sanyo Chemical) 2
An aqueous solution prepared by dissolving 0 parts by weight in 900 parts by weight of water was cast on a drum and dried at a temperature of 60 ° C. to produce a film having a thickness of 40 μm. On one side of the obtained film, aluminum was vapor-deposited using a vacuum vapor-deposition apparatus at a degree of vacuum of 10 @ -4 Torr and a vapor deposition rate of 200 m / min to form an aluminum layer having a thickness of 300 angstroms. I got A 6 cm square bag was prepared using this film so that the aluminum layer was on the outer surface, and a water-soluble bag was obtained.

The obtained water-soluble bag was subjected to a performance test in the same manner as in Example 1. As a result, the fragrance did not leak out of the bag even after 10 days, and the shape of the bag did not change.

Comparative Example 1 Using a polyvinyl alcohol film having a thickness of 40 μm (“SOLBRON KC # 40” manufactured by Icelo Chemical Co., Ltd.), 6 cm
Four-sided bags were made.

The obtained bag was subjected to a performance test in the same manner as in Example 1. As a result, the fragrance had leaked out after one day, and the bag had been stretched and wrinkled due to an increase in the water content.

COMPARATIVE EXAMPLE 2 A 40 μm thick polyvinyl alcohol film (“SOLBRON KC # 40” manufactured by Aicello Chemical Co., Ltd.) was coated on one side with a vacuum degree of 10 −4 Torr and a vapor deposition rate of 600 m /
Under the conditions of min, aluminum was deposited to form an aluminum layer having a thickness of 40 Å, and a water-soluble laminated film was obtained. Using this film, a bag of 6 cm square was prepared with the aluminum layer facing the outside to obtain a bag.

A performance test was performed on the obtained water-soluble bag in the same manner as in Example 1. As a result, the scent began to leak out after 3 days, and the bag was stretched and wrinkled due to an increase in the water content.

Continued on the front page (51) Int.Cl. ⁷ Identification code FI B65D 65/46 B65D 65/46 C23C 14/20 C23C 14/20 A

Claims (4)

(57) [Claims] 1. A on at least one surface of the film consisting of at least one selected from polyvinyl alcohol resins and cellulose <br/> over scan derivative-based resins, thickness 50 to 500
A water-soluble laminated film, wherein an Angstrom metal vapor deposition layer or a metal oxide vapor deposition layer is formed. 2. The water-soluble laminated film according to claim 1, wherein the metal deposited layer is an aluminum deposited layer, and the metal oxide deposited layer is a silicon oxide deposited layer or an alumina deposited layer. 3. The polyvinyl alcohol resin is partially saponified polyvinyl alcohol having a saponification degree of 70 to 98 mol% and a polymerization degree of 300 to 3000, vinyl acetate and allyl acetate, maleic acid, phthalic acid, acrylic acid, methacrylic acid, itacone. A saponified product in which the vinyl acetate component of a copolymer with an acid or α-olefin is saponified, a partially esterified polyvinyl alcohol in which maleic anhydride, an anhydride of phthalic anhydride or succinic anhydride is bonded to polyvinyl alcohol, and polyvinyl alcohol A partially acetalized polyvinyl alcohol obtained by condensing aldehydes of crotonaldehyde, butyraldehyde, furfural or acrolein, wherein the cellulose derivative resin is methylcellulose, hydroxypropylmethylcellulose, hydroxyethylmethyl Cellulose, water-soluble laminate film according to claim 1, wherein the carboxymethyl cellulose sodium U beam. 4. A bag made of at least one selected from polyvinyl alcohol resins and cellulose <br/> over scan derivative-based resins, metal deposition layer having a thickness of 50 to 500 angstroms or metal oxide deposited layer A water-soluble bag, wherein a water-soluble bag is formed.