JP2006240216A - Laminated film and aroma discharging object - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a laminated film having film functions such as proper moisture permeability and oxygen permeability, and to obtain an aroma discharging object excellent in safety by packaging the contents containing volatile perfume components with the laminated film so as to achieve excellent portability and stability of shape, to prevent liquid volatile perfume components from leaking outside, and to control speed of discharging volatile components of contents. <P>SOLUTION: The laminated film comprises a non-woven fabric layer and a thermoplastic polyurethane resin layer having a hardness of 80-98A and a moisture permeability of 50-5,000 g/m<SP>2</SP>×24 h. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a laminated film, and in particular, packages contents containing a volatile fragrance component, and utilizes the fact that the volatile fragrance component of the contents permeates the laminated film to provide an aromatherapy device and a medical device. It is related with the laminated | multilayer film used suitably as packaging materials.

  Conventionally, a fragrance containing a liquid aroma component in a carrier or the like and packaged with a sheet is known. For example, a porous carrier containing a pheromone substance is coated with a control film such as polyethylene, and a pheromone preparation in which release of the pheromone substance is controlled (see Patent Document 1), a gas barrier outer film is removed, and a porous film is removed. Matte insect repellent, sublimation chemical, fragrance packaging bag (see Patent Document 2), porous material sheet impregnated and fixed with fragrance, through which active ingredients are evaporated through an inner film made of film or nonwoven fabric And a car fragrance emitting device having an adhesive surface holding a porous material sheet (see Patent Document 3), a joining film of a thermoplastic polyurethane film and various films, a dehumidifying agent, a fragrance, and an insect repellent using this film And gloves (see Patent Document 4), a transpiration liquid container bag containing a transpiration liquid in a gas permeable film that is flexible on at least one side (patent document) . 5) or the like have been disclosed.

JP 59-13701 A JP-A-9-86568 JP 2001-199859 A JP 2002-137351 A JP 2004-81179 A

  However, many of the fragrances described in these patent documents volatilize the aroma component through a porous membrane or nonwoven fabric coated with a carrier impregnated or coated with the liquid aroma component, and the active component cannot be volatilized constantly. However, there are problems such that the fragrance component directly touches the skin, clothing, etc. or is not portable.

  For example, in the case of Patent Document 1, the pheromone substance remains adsorbed on the support layer without being released, and the active ingredient cannot be used efficiently. In the case of Patent Document 2, since the mat impregnated with the active ingredient of the insect repellent, the sublimation agent and the fragrance is used, it is difficult to volatilize the active ingredient constantly and continuously. Moreover, there exists a possibility that skin may touch an active ingredient directly from an opening part.

  In the case of Patent Document 3, it is difficult to impregnate and fix a large amount of fragrance in the fine pores of the porous material sheet, and since the volatility is controlled by the pore size of the porous material sheet, the initial volatilization amount of the active ingredient is growing.

In the case of Patent Document 4, the thickness of the polyurethane layer is limited, and when a volatile component is filled, peeling between the polyurethane film and the various films becomes a problem.
In the case of Patent Document 5, the transpiration liquid is hermetically sealed with a gas permeable film, but a heating transpiration device is required at the time of use, and portability is not considered.

  In view of the above problems, the object of the present invention is to have portability and shape stability when packaging a content having a film function of appropriate moisture permeability and oxygen permeability and containing a volatile fragrance component. Providing a laminated film capable of controlling the rate at which the volatile components of the contents are released, and providing a fragrance release device with excellent safety, which does not leak liquid fragrance components to the outside. There is to do.

The laminated film according to the invention described in claim 1 is characterized by comprising a thermoplastic polyurethane resin layer having a hardness of 80 to 98 A and a moisture permeability of 50 to 5000 g / m ² · 24 h, and a nonwoven fabric layer. And

  The laminated film according to the invention of claim 2 is characterized in that the polyol component of the thermoplastic polyurethane resin is an ester polyol or an ester carbonate polyol.

  The laminated film according to the invention of claim 3 is characterized in that the nonwoven fabric is a nonwoven fabric made of polyester resin fibers or polyamide resin fibers.

The fragrance releasing device according to the invention of claim 4 is a laminate film comprising a thermoplastic polyurethane resin layer having a hardness of 80 to 98 A and a moisture permeability of 50 to 5000 g / m ² · 24 h, and a nonwoven fabric layer. Wrapping contents containing volatile fragrance ingredients, and wrapping contents containing volatile fragrance ingredients with the laminated film, characterized in that the volatile fragrance ingredients are gradually volatilized. It is characterized by gradually evaporating.

  The thermoplastic polyurethane resin constituting the thermoplastic polyurethane resin layer is composed of a bifunctional polyol having a weight average molecular weight of 500 to 4000 (hereinafter simply referred to as “bifunctional polyol”), a diisocyanate, and a weight average molecular weight. A low molecular weight diol having a molecular weight of less than 500 (hereinafter referred to as “chain extender”) is used as a main raw material, and has a thermoplastic property among polymers containing urethane groups in the molecular structure.

  The thermoplastic polyurethane-based resin is a block copolymer composed of a hard segment made by a reaction between a chain extender and a diisocyanate and a soft segment made by a reaction between a bifunctional polyol and a diisocyanate.

  Furthermore, the thermoplastic polyurethane resin is distinguished by the kind of the main raw material such as the above-mentioned bifunctional polyol used, for example, polyether polyurethane resin, polyester polyurethane resin, polycarbonate polyurethane resin, etc. It is done. These thermoplastic polyurethane resins may be used alone or in combination of two or more. Moreover, if it is the range of this invention, you may contain materials other than a polyurethane-type resin in order to improve a moldability.

  The bifunctional polyol is not particularly limited, and examples thereof include polyether polyols, polyester polyols, polycarbonate polyols, and the like. From the viewpoint of chemical resistance to volatile fragrance components, polyester polyols or polycarbonate polyols are used. Polyols are preferred. In addition, a polyol component may be used independently or 2 or more types may be used together.

  Examples of the polyether polyol include polyoxyethylene glycol, polyoxypropylene glycol, polyoxytetramethylene glycol, and the like. 1,2-ethanediol, 1,2-propanediol, 1,4-butanediol Etc. can be obtained by condensation polymerization or ring-opening polymerization of cyclic ethers such as ethylene oxide, propylene oxide, and tetrahydrofuran.

  Examples of the polyester polyol include polyester polyols obtained by condensation polymerization of dibasic acids such as adipic acid, sebacic acid and terephthalic acid, and low molecular weight polyols, polycaprolactone glycol, and the like.

  Furthermore, examples of the polycarbonate polyol include polycarbonate polyols obtained by condensation polymerization of dialkyl carbonates such as dimethyl carbonate and diethyl carbonate, phosgene, chloroformate, diallyl carbonate, alkylene carbonate, and low molecular weight polyols. Can be mentioned.

  Examples of the diisocyanate include toluene diisocyanate, 4,4'-diphenylmethane diisocyanate, polymeric MDI, tolylene diisocyanate, p-phenylene diisocyanate, naphthalene diisocyanate, hexamethylene diisocyanate, isophorone diisocyanate, hydrogenated MDI, and the like.

  Examples of the chain extender include polyoxyethylene glycol, polyoxypropylene glycol, 1,4-butanediol, trimethylolpropane, bishydroxyethoxybenzene, and the like.

  The thermoplastic polyurethane resin layer is limited to a hardness of 80 to 98A. If the hardness is less than 80A, the resulting laminated film is too soft, making it difficult to maintain the shape when packaged in a bag shape. Conversely, if the hardness exceeds 98A, the laminated film is too hard and uncomfortable during use. May result. In the present invention, the hardness of the thermoplastic polyurethane resin layer refers to a value measured according to JIS K 6301.

  Here, the hardness of the thermoplastic polyurethane-based resin layer can be achieved by adjusting the amount of the hard segment component in the thermoplastic polyurethane-based resin, and specifically, the chain in the raw material of the thermoplastic polyurethane-based resin. The hardness of the thermoplastic polyurethane resin layer can be increased by increasing the content of the extender, while the hardness of the thermoplastic polyurethane resin layer can be decreased by decreasing the content of the chain extender. .

Moreover, the moisture permeability of the thermoplastic polyurethane resin layer is limited to 50 to 5000 g / m ² · 24 h. If the moisture permeability is less than 50 g / m ² · 24 h, the fragrance component does not volatilize sufficiently and the prescribed effect cannot be exhibited. Conversely, if the moisture permeability exceeds 5000 g / m ² · 24 h, the fragrance is excessive. The components are volatilized and the performance cannot be exhibited for a certain period of time. In the present invention, the moisture permeability of the thermoplastic polyurethane-based resin layer refers to a value measured according to the condition B of JIS Z 0208 “Moisture permeability test method for moisture-proof packaging material (cup method)”.

  Here, the moisture permeability of the thermoplastic polyurethane resin layer can increase the moisture permeability of the thermoplastic polyurethane resin layer by increasing the content of the chain extender in the raw material of the thermoplastic polyurethane resin. By reducing the content of the chain extender, the moisture permeability of the thermoplastic polyurethane resin layer can be lowered.

  In the present invention, the nonwoven fabric is not particularly limited. For example, polyethylene resin, ethylene-vinyl acetate copolymer, polypropylene resin, rayon, polyester resin, polyamide resin, polyvinyl alcohol, modified polyvinyl alcohol, acrylic resin, Non-woven fabric made of fibers comprising hardwood pulp, softwood pulp, silk, wool, cotton, hemp or a mixture thereof. Among these, non-woven fabrics made of fibers made of a polyester resin such as polyethylene terephthalate or a polyamide resin such as nylon are preferable from the viewpoint of adsorbing perfume and adhesive strength with a thermoplastic polyurethane resin.

  Since the laminated film of the present invention is formed by laminating the thermoplastic polyurethane resin layer and the nonwoven fabric layer, it can be used for blocking in comparison with the case where the thermoplastic polyurethane resin is used as a single layer during handling in production. It is effective because it is difficult for the films to adhere to each other when applied to a machine. In addition, when a bag is made using this laminated film and the contents containing a volatile fragrance component are enclosed in this bag to produce an aroma release device, a single layer of a thermoplastic polyurethane resin is used when the consumer handles it. Compared with the use in the case, the surface is not sticky, and the shape is not distorted and deformation such as wrinkles does not occur, so that the feeling of use is improved. As the volatile fragrance component, a general-purpose fragrance component may be used as long as it is liquid and volatile at room temperature and normal pressure. Moreover, when using with a nonwoven fabric single layer, there exists a possibility that the content containing a volatile fragrance | flavor component may ooze out from a nonwoven fabric.

  Although it does not specifically limit as a manufacturing method of the laminated | multilayer film of this invention, For example, after forming a thermoplastic polyurethane-type resin into a film by the T-die method or an inflation method, the obtained thermoplastic polyurethane-type resin film and a nonwoven fabric are used as an adhesive agent. Alternatively, a method of bonding using heat, a method of directly extruding and laminating a molten thermoplastic polyurethane resin film on a non-woven fabric, and the like can be mentioned.

  The laminated film of the present invention is configured as described above, and has a film function of appropriate moisture permeability and oxygen permeability, and when a content containing a volatile fragrance component is packaged with the laminated film, A fragrance release device with portability and shape stability, which does not leak liquid fragrance components and has excellent safety, and further controls the rate at which the volatile components of the contents are released. Therefore, it can be suitably used as a packaging material for aromatherapy devices such as fragrance-containing sachets and medical devices that volatilize volatile fragrance components and the like conveniently.

  The embodiments of the present invention will be described in more detail with reference to the following examples, but the present invention is not limited to these examples.

(Preparation of aroma component-containing gel)
30 parts by weight of a styrene-butadiene block polymer powder as a gelling agent was added to 100 parts by weight of an oil-soluble liquid volatile perfume ingredient (trade name “Limonene” manufactured by Tokyo Chemical Industry Co., Ltd.), and stirred at room temperature. It was allowed to stand for 2 to 3 hours to obtain an oil-soluble volatile perfume component-containing gel.

Example 1
By extruding and laminating a polycarbonate urethane film (trade name “Milactolan” manufactured by Nippon Polyurethane Industry Co., Ltd., hardness: 95A) to a thickness of 200 μm on one surface of a polyethylene terephthalate nonwoven fabric having a basis weight of 30 g / m ² , A laminated film in which a polycarbonate urethane film was laminated and integrated on one surface of a polyethylene terephthalate nonwoven fabric was obtained. The moisture permeability of the polycarbonate-based urethane film of the laminated film was 200 g / m ² .

  And using the said laminated | multilayer film, the polyethylene terephthalate type nonwoven fabric of this laminated | multilayer film is made outside, and a bag body (dimension 25x40mm) is produced, The said oil-soluble volatile fragrance | flavor component containing gel 0.5 is contained in this bag body. A fragrance releasing device was obtained by enclosing milliliters. The obtained fragrance releasing device was left in an atmosphere at 25 ° C., and performance was evaluated according to the following evaluation method.

(Example 2)
Except that the thickness of the polycarbonate urethane film was set to 50 μm, an aroma release device was prepared in the same manner as in Example 1, and performance evaluation was performed. The moisture permeability of the polycarbonate urethane film of the laminated film was 700 g / m ² .

(Comparative Example 1)
A fragrance releasing device was obtained in the same manner as in Example 1 except that a polycarbonate urethane film (hardness 95A, moisture permeability 200 g / m ² · 24h) having a thickness of 200 μm was used instead of the laminated film, and performance evaluation was performed. went.

(Comparative Example 2)
A fragrance emitting device was obtained in the same manner as in Example 1 except that a polycarbonate-based urethane film (hardness 95A, moisture permeability 700 g / m ² · 24h) having a thickness of 50 μm was used instead of the laminated film, and performance evaluation was performed. went.

(Performance evaluation)
The performance of the fragrance releasing device obtained above was evaluated by the following method. The results were as shown in Table 1.

1. Appearance Fragrance release device obtained by packaging volatile perfume component-containing gel with laminated film is left in a room at 25 ° C and visually observed for wrinkles due to swelling after the gel has been sealed after 7 days. And evaluated based on the following criteria.
○: No wrinkles were generated on the surface of the fragrance releaser.
X: Wrinkles were generated on the surface of the fragrance releaser.

2. Evaluation of fragrance persistence The fragrance persistence evaluation was comprehensively evaluated by a fragrance intensity test which is a sensory test and a volatility test for determining a change in the weight reduction rate of the volatile fragrance component-containing gel.

(1) Fragrance strength test The fragrance release tool obtained by packaging a volatile fragrance component-containing gel with a laminated film is left indoors in a 25 ° C atmosphere, and the degree of fragrance after 1, 3, 7 days. Was evaluated by smell. The case where the scent was felt without taking it in the hand was designated as “strong: A”, the case where the scent was felt in the hand with “normal: B”, and the case where the scent was felt without being brought close to the nose was designated as “weak: C”.

(2) Volatility test The fragrance releaser obtained by packaging the volatile perfume component-containing gel with a laminated film is left indoors in a 25 ° C atmosphere, and the weight after 1 day, 3 days, and 7 days have passed. The weight change rate was measured by the following formula.
Weight reduction rate (% by weight) = [(Aroma releasing device weight immediately after preparation−Aroma releasing device weight after elapse of a predetermined number of days) / (Gel weight immediately after preparation−Gel weight after elapse of a predetermined number of days)] × 100

3. Tactile sensation test of volatile fragrance component-containing gel The fragrance releasing device obtained by packaging the volatile fragrance component-containing gel with a laminated film is left in a room at 25 ° C. for 1 day, 3 days, 7 days. Flexibility was determined by palpation with a finger for a total of 3 times after the passage of the day. In the fragrance releasing device, the gel moved moderately and had good flexibility, and the case where the gel was slightly cured was evaluated as Δ, and the case where the gel did not move when cured was evaluated as x.

  As is clear from Table 1, in the case of the laminated film of the example of the present invention, the laminated film did not undergo deformation such as wrinkles, and the fragrance sustainability was good. On the other hand, in the case of the comparative example which does not use a nonwoven fabric layer, the result that deformation | transformation of wrinkles etc. generate | occur | produces in the polycarbonate-type urethane film was obtained.

Claims (4)

A laminated film comprising a thermoplastic polyurethane resin layer having a hardness of 80 to 98 A and a moisture permeability of 50 to 5000 g / m ² · 24 h, and a nonwoven fabric layer. The laminated film according to claim 1, wherein the polyol component of the thermoplastic polyurethane resin is a polyester polyol or a polycarbonate polyol. The laminated film according to claim 1 or 2, wherein the nonwoven fabric is a nonwoven fabric made of polyester resin fibers or polyamide resin fibers. Packaging contents containing volatile perfume ingredients with a laminated film comprising a thermoplastic polyurethane resin layer having a hardness of 80 to 98 A and a moisture permeability of 50 to 5000 g / m ² · 24 h and a nonwoven fabric layer. And the fragrance | flavor release tool characterized by being comprised so that a volatile fragrance | flavor component may be volatilized gradually.