TW201730253A - Food packaging film, and gift-boxed small roll of food packaging film - Google Patents

Abstract

The present invention provides a food packaging film that contains a thermoplastic resin, a blue colorant, and a polyester plasticizing agent having a number average molecular weight of 1,000-1,800.

Description

Film for food packaging and small film for food packaging with color box

The present invention relates to a film for food packaging and a small roll film for food packaging with a color box.

Conventionally, a film for food packaging has been used as a film for business in restaurants, restaurants, and the like, or widely used in households during food storage, cooking, and the like. In recent years, in order to facilitate the visual observation of the incorporation of the film fragments into the food, a film for food packaging containing a thermoplastic resin as a main component and a coloring agent such as a copper phthalocyanine coloring agent has been proposed (Patent Document 1).

On the other hand, in the film for food packaging, an additive such as a plasticizer, an antifogging agent, or a stabilizer is usually used for the purpose of imparting flexibility to the film or the like, or for easily producing a film.

However, in recent years, the specifications of the food hygiene law and the standard are being studied. In cooperation with countries, the standard of the amount of the additive contained in the film for food packaging into the food is becoming a problem. As one of the most powerful insights at present, the amount of additive dissolved into food should meet the European Union (EU) specification x benchmark of 25 μg/ml. [Prior Art Document] [Patent Literature]

[Patent Document 1] Japanese Patent Laid-Open No. 2015-7198

[Problem to be Solved by the Invention] An object of the present invention is to provide a film for food packaging which can suppress elution of an additive into foods, and which is excellent in film formability and productivity, and a small roll film for food packaging with a color box. [Means for solving the problem]

The present invention provides a film for food packaging comprising: a thermoplastic resin, a blue colorant, and a polyester-based plasticizer having a number average molecular weight of 1,000 to 1800.

The content of the polyester-based plasticizer is preferably from 6.5% by mass to 12.5% by mass based on the total amount of the film.

The thermoplastic resin may be at least one selected from the group consisting of a polyvinyl chloride resin, a polyvinylidene chloride resin, a polyolefin resin, a polystyrene resin, a polyester resin, and a polyamide resin. .

The film may contain 70% by mass or more of at least one selected from the group consisting of a polyvinyl chloride resin and a polyvinylidene chloride resin as a thermoplastic resin.

Moreover, the present invention provides a small roll film for food packaging with a color box, comprising the film for food packaging, a core material for filming a film for food packaging, and a color box containing a film for packaging a food and a core material. Further, a color filter is provided to cut the blade portion of the film for food packaging. [Effects of the Invention]

According to the present invention, it is possible to provide a film for food packaging which can suppress elution of an additive into food, and which is excellent in film formability and productivity, and a small roll film for food packaging with a color box.

The film of the present embodiment contains a thermoplastic resin, a blue colorant, and a polyester-based plasticizer having a number average molecular weight of 1,000 to 1800 (hereinafter also referred to as "predetermined polyester-based plasticizer"), and can be suitably used. Used as a film for food packaging.

The thermoplastic resin may be a polyvinyl chloride resin such as polyvinyl chloride; a polyvinylidene chloride resin such as polyvinylidene chloride; a polyolefin resin such as polyethylene, polypropylene or an ethylene-vinyl acetate copolymer saponified product; Diene-styrene copolymer, acrylonitrile-styrene copolymer, polystyrene, styrene-butadiene-styrene copolymer, styrene-isoprene-styrene copolymer, styrene-acrylic acid copolymerization Polystyrene resin such as polystyrene resin; polyester resin such as polyethylene terephthalate, polyethylene naphthalate or polybutylene terephthalate; 6-nylon, 6,6-nylon, 12 - Polyamide type resin such as nylon. From the viewpoint of excellent handleability, the thermoplastic resin is preferably a polyvinyl chloride resin or a polyvinylidene chloride resin.

The polyvinyl chloride resin is preferably a polyvinyl chloride resin having an average polymerization degree of 700 to 1300 from the viewpoint of excellent moldability, heat resistance and fluidity of the film. The average degree of polymerization in the present specification means the average degree of polymerization measured in accordance with Japanese Industrial Standards (JIS) K6720-2.

From the viewpoint of excellent mechanical properties, the polyvinyl chloride resin may be a vinyl chloride homopolymer (polyvinyl chloride resin), and for the purpose of imparting other properties, it may be vinyl chloride and other monomers copolymerizable therewith. Copolymer. The copolymer may be a graft copolymer, a block copolymer or a random copolymer. Examples of the other monomer include an olefin such as ethylene, propylene or polybutene; a vinyl ester of a saturated acid such as vinyl acetate or vinyl laurate; and an unsaturated acid such as methyl acrylate or methyl methacrylate; An alkyl vinyl ether such as lauryl vinyl ether; maleic acid, acrylonitrile, styrene, methyl styrene, vinylidene fluoride or the like. When the polyvinyl chloride resin is a copolymer, the content of the vinyl chloride unit in the copolymer may be 10% by mass or more based on the total amount of the monomer units, and is preferably 30% from the viewpoint of excellent mechanical properties. More than %, more preferably 50% by mass or more. The upper limit of the content of the vinyl chloride unit in the copolymer is not particularly limited, and may be, for example, 99% by mass or less based on the total amount of the monomer units.

The polyvinyl chloride resin may be, for example, a polymer blend of a three-dimensional polymer such as acrylonitrile-butadiene-styrene, a post-treated product using an alcohol or the like, or a post-treated product using a chlorine-containing compound. In these cases, the content of the vinyl chloride unit in the polyvinyl chloride resin may be 10% by mass or more based on the total amount of the resin.

The polyvinylidene chloride-based resin may be a vinylidene chloride homopolymer (polyvinylidene chloride resin), and may be, for example, a monomer containing vinylidene chloride and copolymerizable with vinylidene chloride as a monomer. Copolymer of the unit. The other monomer may be vinyl chloride, acrylate of acrylic acid and carbon with 1 to 8 carbon atoms, methacrylic acid of methacrylic acid and alcohol having 1 to 8 carbon atoms, vinyl ester of aliphatic carboxylic acid, unsaturated aliphatic Carboxylic acid, olefin, vinyl ether, and the like. Further, a copolymer of vinylidene chloride and vinyl chloride is used as a polyvinylidene chloride-based resin.

The content of the vinylidene chloride unit in the polyvinylidene chloride-based resin can be, for example, 60% by mass or more and 70% by mass or more based on the total amount of the monomer units, from the viewpoint of the film formability and the heat resistance. Or 80% by mass or more. The upper limit of the content of the vinylidene chloride unit in the polyvinylidene chloride-based resin is not particularly limited, and may be, for example, 99% by mass or less based on the total amount of the monomer units. The content of the vinylidene chloride unit can be determined by a Nuclear Magnetic Resonance (NMR) apparatus.

The weight average molecular weight of the polyvinylidene chloride-based resin can be, for example, 40,000 to 180,000, 60,000 to 160,000, or 80,000 to 140,000. The weight average molecular weight of the polyvinylidene chloride-based resin can be measured by a gel permeation chromatography (GPC) method using polystyrene having a known molecular weight as a standard substance.

The conditions of the GPC method for measuring the weight average molecular weight of the polyvinylidene chloride-based resin are as follows. As the measuring device, a gel chromatograph manufactured by Waters Corporation, the Alliance GPC2000 type, was used. The polyvinylidene chloride-based resin was dissolved in tetrahydrofuran so as to be 0.5 wt% (by weight), and it was used as a sample. Pipe column: TSKgel GMHHR-H(S)HT 30 cm×2, TSKgel GMH6-HTL 30 cm×2 manufactured by Tosoh Corporation Mobile phase: tetrahydrofuran detector: differential refractometer flow rate: 1.0 mL/min column temperature :20°C Injection volume: 500 μL

The content of the thermoplastic resin may be 70% by mass or more or 75% by mass or more, and may be 85% by mass or less or 80% by mass or less based on the total amount of the film. The content of the polyvinyl chloride resin or the polyvinylidene chloride resin is preferably in the above range.

The blue colorant is, for example, a colorant having a maximum absorption wavelength in a visible light region (380 nm to 750 nm) in the range of 600 nm to 750 nm. The absorbance in the maximum absorption wavelength in the visible light region of the blue colorant is preferably 2 times or more, more preferably 3 times or more, in the absorbance at 470 nm. Specifically, the blue colorant may be copper phthalocyanine (copper phthalocyanine blue), hexacyanoferric iron (ii) iron (III) oxide, cobalt oxide x alumina mixture, indigo, ultramarine or the like.

The content of the blue colorant may be 0.5% by mass or more based on the total amount of the film, and may be 2.0% by mass or less.

The number average molecular weight of the polyester-based plasticizer is from 1,000 to 1,800, and from the viewpoint of further suppressing the elution of the additive into the food, it is preferably from 1200 to 1800, more preferably from 1300 to 1800, and still more preferably from 1400 to 1800. , especially good for 1500 ~ 1800. The number average molecular weight in the present invention is a polystyrene-converted number average molecular weight measured by GPC (for example, Agilent Technologies, Inc., model: Agilent 1260 Infinity GPC).

The conditions of the GPC in the measurement of the number average molecular weight of the polyester-based plasticizer are as follows. As the measuring device, a gel chromatograph manufactured by Waters Corporation, the Alliance GPC2000 type, was used. After completely dissolving 30 mg of the sample in 20 mL of o-dichlorobenzene at 145 ° C, the solution was filtered using a sintered filter having a pore size of 0.45 μm, and the filtrate was used as a sample solution. Other conditions are as follows. Pipe column: TSKgel GMHHR-H(S)HT 30 cm×2, TSKgel GMH6-HTL 30 cm×2 manufactured by Tosoh Corporation Mobile phase: o-dichlorobenzene detector: differential refractometer flow rate: 1.0 mL/min Column temperature: 140 ° C Injection volume: 500 μL

Examples of the polyester-based plasticizer include an aliphatic polybasic acid-based polyester plasticizer. The aliphatic polybasic acid-based polyester plasticizer may be, for example, a polyester resin of an aliphatic polybasic acid such as adipic acid or sebacic acid and a polyhydric alcohol such as ethylene glycol, propylene glycol or butylene glycol. Specific examples of the aliphatic polybasic acid-based polyester plasticizer include poly(ethylene glycol/dipic acid) ester, poly(1,3-butanediol/adipate) ester, and poly(1). , 4-butanediol/adipate ester, poly(propylene glycol/sebacic acid) ester, and the like. These polyester-based plasticizers may be used alone or in combination of two or more.

The content of the predetermined polyester-based plasticizer is preferably 6.5 mass% or more, more preferably 7.0 mass% or more, and further preferably, based on the total amount of the film, from the viewpoint of further suppressing the elution of the additive into the food. It is 8.0% by mass or more, and particularly preferably 10.0% by mass or more. The content of the predetermined polyester-based plasticizer is preferably 12.5% by mass or less, and more preferably 12.0% by mass or less, based on the total amount of the film, from the viewpoint of the film forming property and the productivity. The content of the predetermined polyester-based plasticizer is preferably from 6.5% by mass to 12.5 by weight based on the total amount of the film, from the viewpoint of further suppressing the elution of the additive into the food and further improving the film forming property and the productivity. %, 6.5% by mass to 12.0% by mass, 7.0% by mass to 12.5% by mass, 7.0% by mass to 12.0% by mass, 8.0% by mass to 12.5% by mass, 8.0% by mass to 12.0% by mass, and 10.0% by mass to 12.5% by mass, Or 10.0% by mass to 12.0% by mass.

The film may further contain other components in addition to the thermoplastic resin, the blue colorant, and the predetermined polyester plasticizer. Examples of other components include a heat stabilizer, a light stabilizer, a plasticizer other than a predetermined polyester plasticizer, a lubricant, a filler, an anti-precipitation agent, an antioxidant, a mold release agent, and a viscosity reducing agent. A surfactant other than a surfactant, a blue colorant, a fluorescent agent, a surface treatment agent, a crosslinking agent, a processing aid, an adhesive, an antistatic agent, an ultraviolet absorber, an anti-caking agent, and the like.

The film may comprise a layer comprising a thermoplastic resin, a blue colorant and a defined polyester-based plasticizer, or may comprise a plurality of layers. When the film includes a plurality of layers, the film may have, for example, a first surface layer, an intermediate layer, and a second surface layer in this order. In this case, for example, the first surface layer and the second surface layer may contain a thermoplastic resin and a predetermined polyester-based plasticizer, and the intermediate layer may contain a thermoplastic resin and a blue colorant. In order to improve the adhesion between the layers, the film may further include an adhesive layer containing an acid-modified polyolefin resin or the like, and further, a heat-resistant layer containing a polyamide resin may be further provided in order to improve the heat resistance of the film. When the thermoplastic resin is a polyvinyl chloride resin, the film preferably contains a layer containing a thermoplastic resin (polyvinyl chloride resin), a blue colorant, and a predetermined polyester plasticizer.

The thickness of the film is preferably 5 μm or more, more preferably 6 μm or more, and is preferably 25 μm or less from the viewpoint of excellent handleability, from the viewpoint of efficiently blocking the contact of the external gas with the food. More preferably, it is 12 μm or less.

The elution amount of the additive contained in the film is preferably 25 μg/ml or less, and more preferably 20 μg/ml or less, as the amount of heptane eluted and the amount of isooctane eluted measured according to the following procedure.

(Heptane elution amount) film specimen was cut from a fixed area, at the temperature 25 ℃, the surface area of the sample in one hour a sample 1 cm ² to 2 ml heptane immersed respect. Then, the heptane solution after taking out the sample was evaporated to dryness, and the mass of the solid matter was measured, thereby determining the amount of elution of the additive from the film to heptane.

(Isooctane elution amount) A sample having a fixed area was cut out from the film, and the sample was immersed in an isooctane solution of 2 ml of a surface area of 1 cm ² with respect to the sample at a temperature of 25 ° C for 30 minutes. Then, the isooctane solution after taking out the sample was evaporated to dryness, and the mass of the solid matter was measured, thereby determining the amount of elution of the additive from the film to isooctane.

The film is produced by using a mixer such as a V-type agitator, a belt agitator, a Henschel mixer, or a high-speed mixer to contain a thermoplastic resin, a blue colorant, and a predetermined polyester plasticizer. The composition is mixed, and if necessary, kneaded by a kneader such as a mixing roll, a Banbury mixer, or a kneader to obtain a composition, for example, extrusion molding. Specifically, the composition is supplied to a funnel of an extruder, and a target film is obtained by an expansion method, a T-die method, or the like. Usually, the film is wound up on one side, and the wound film is further wound into various desired lengths (small rolls) of 20 m, 50 m, and loaded into a color box, thereby becoming a product. . That is, the film in the present embodiment may be in the form of a small roll film for food packaging, or may be in the form of a small roll film for food packaging with a color box.

Specifically, as shown in FIG. 1 , the small roll film 1 for food packaging with a color box may be in the form of a film for food packaging 2, a core material 3 having a film 2 for food packaging, and a core material 3 The film 2 for food packaging and the color box 4 of the core material 3 are provided in the color box 4 to cut the blade portion 5 of the film 2 for food packaging. The material of the core material 3 and the color box 4 is not particularly limited. From the viewpoint of easily recognizing the color of the film 2, at least a part of the color box 4 is preferably transparent or opened to the extent that the function of the box is not impaired.

When the film contains a plurality of layers, the film is obtained by separately putting the constituent raw materials of the respective layers into different extruders and extruding them by extrusion, and coextruding the layers by expansion, T-die molding or the like to laminate the layers. . In this case, it is preferred to form a film by directly taking out the melt extruded from the T-shaped mold while rapidly cooling the surface by a casting roll or the like.

For the purpose of reducing the heat shrinkage rate, the natural shrinkage rate, and the like, and suppressing the occurrence of the width shrinkage, the film obtained in the above manner may be subjected to heat treatment such as longitudinal stretching between the heating rolls, various heat setting, and aging, in order to impart and promote prevention. The film obtained in the above manner may be subjected to corona treatment, aging treatment, surface treatment such as printing, coating, surface treatment, and the like, such as fogging, antistatic property, and adhesiveness.

The film described above is a film which can visually recognize the packaged food from the outside. Further, the film is a film (stretched film) having extensibility (also referred to as stretchability).

The film of the present embodiment may be a film for classification of foods used for classification of foods. When the film of the present embodiment is used, two or more kinds of foods can be classified into at least two groups in accordance with the type of the food. In other words, for example, the first food can be packaged in the film of the present embodiment and classified into the first group. On the other hand, the second food can be packaged by a film having a color different from that of the film of the embodiment or a colorless film. Group 2.

Specifically, for example, when there is a first food containing the first allergic substance and a second food containing the second allergenic substance, the first food is classified as being provided for the first allergy The first group of the food group of the person whose sexual substance does not have allergic symptoms, and the second type of food is classified as the food group provided to the person who does not have allergic symptoms to the second allergic substance 2 teams. In the above example, it is possible to suppress the occurrence of an accident in which the allergic substance is supplied to a person having allergic symptoms to the first allergic substance or the second allergic substance. [Examples]

Hereinafter, the present invention will be specifically described based on examples, but the present invention is not limited to the examples.

After the thermoplastic resin, the blue colorant, and various additives shown in Tables 1 and 2 were placed in a high-speed mixer, the material temperature was raised from normal temperature to 130 ° C while stirring, and after cooling, the mixture was cooled to The resin composition was taken out at a time point of 70 ° C, and a f40 mm single-axis extruder (L/D = 20) equipped with a T-shaped mold (width: 350 mm, gap 0.4 mm) was used, and the resin temperature was 200 ° C. Each of the resin compositions was extruded to prepare a film having a thickness of 8 μm. In addition, the numerical value in a table is a solid-content conversion value, and shows mass %.

Thermoplastic resin a1: Polyvinyl chloride resin (manufactured by Taiyo Vinyl Corporation, "TH-1000", average degree of polymerization: 1000) Blue colorant b1: copper phthalocyanine (copper phthalocyanine blue) , manufactured by Daisei Seiki Co., Ltd., "NX-053 Blue") Additive c1: Polyester plasticizer (Manufactured by ADEKA Co., Ltd., "PN-150", number average molecular weight: 1000, Adipic acid-based polyester) Additive c2: Polyester-based plasticizer (manufactured by J-Plus Co., Ltd., "D623", number average molecular weight: 1800, adipic acid-based polyester) Additive c3: Polyester plasticization Agent (manufactured by J-Plus Co., Ltd., "D620N", number average molecular weight: 800, adipic acid polyester) Additive c4: Polyester plasticizer (Manufactured by ADEKA Co., Ltd., "P -200", number average molecular weight: 2000, adipic acid polyester) Additive c5: Dioctyl adipate (manufactured by Shin-Nippon Chemical Co., Ltd., "Sanso Cizer DOA") Additive c6: Epoxidized soybean oil (Sanhe Manufactured by Cheng Chemical Co., Ltd., "Chemicizer SE-100") Additive c7: glycerin fatty acid ester (manufactured by Riken Vitamin Co., Ltd., "XO-100") Additive c8: Ca/ Zn stabilizer (Manufactured by ADEKA Co., Ltd., "SC-308E")

The amount of elution of the additive was measured by the following procedure for each film obtained.

(Heptane elution amount) A sample of 5 cm × 10 cm was cut out from the film in such a manner that the surface area of the front and back surfaces was 100 cm ² , and the sample was placed at a surface area of 1 cm with respect to the sample at a temperature of 25 ° C. ² was immersed in 2 ml of heptane for 1 hour. Then, the test solution after taking out the sample was evaporated to dryness at 105 ° C, and left to cool. The mass of the solid component after cooling was measured, and the amount of elution of the component from the film to heptane was calculated by the following formula. In the case of a polyvinyl chloride resin, when it is 150 μg/ml or less, it can be said to be good, and when it is 30 μg/ml or less, it can be said to be very good. Evaporation residue (μg/ml) = weight of solid component (μg) / amount of test solution taken (ml)

(Isooctane elution amount) A sample of 5 cm × 10 cm was cut out from the film in such a manner that the total surface area of the front and back surfaces was 100 cm ² , and the surface area of the sample was relative to the sample at a temperature of 25 ° C. The cm ² was immersed in 2 ml of isooctane solution for 30 minutes. Then, the test solution after taking out the sample was evaporated to dryness at 105 ° C, and left to cool. The mass of the solid matter after cooling was measured, and the amount of elution of the component from the film to isooctane was determined by calculation according to the following formula. In the case of a polyvinyl chloride resin, it can be said to be good if it is 90 μg/ml or less, and it can be said to be very good if it is 30 μg/ml or less. Evaporation residue (μg/ml) = weight of solid component (μg) / amount of test solution taken (ml)

(Evaluation of film forming property) The film forming property was evaluated by extruding each resin composition at a resin temperature of 200 ° C using a T-die extruder, and observing the appearance of the obtained film. The evaluation criteria are as follows. In addition, when it evaluated as A or B, it can be said that it is excellent in film-formability. A: A film having a substantially uniform thickness was obtained, and no yellowing occurred in the extrusion for 24 hours. B: The unevenness was slightly observed in the thickness of the film, and yellowing occurred in the extrusion for 24 hours. C: The thickness of the film was not uniform, and yellowing occurred in the extrusion for 8 hours.

(Evaluation of Productivity) The production failure (opening, film breakage, and slit failure) which occurred when the resin composition was extruded at a resin temperature of 200 ° C by a T-die extruder to perform film formation. Productivity was evaluated by the number of occurrences every 24 hours. The evaluation criteria are as follows. In addition, when it evaluates as A or B, it can be said that it is excellent in productivity. A: The number of production failures is 0 to 2 times. B: The number of production failures is 3 to 4 times. C: The number of production failures is 5 or more.

[Table 1]

[Table 2]

1‧‧‧Small film for food packaging with color boxes
2‧‧‧film for food packaging
3‧‧‧ core material
4‧‧‧ color box
5‧‧‧blade

Fig. 1 is a schematic view showing a small roll film for food packaging with a color box.

1‧‧‧Small film for food packaging with color boxes

2‧‧‧film for food packaging

3‧‧‧ core material

4‧‧‧ color box

5‧‧‧blade

Claims (4)

A film for food packaging comprising: a thermoplastic resin, a blue colorant, and a polyester-based plasticizer having a number average molecular weight of 1,000 to 1800. The film for food packaging according to the first aspect of the invention, wherein the content of the polyester-based plasticizer is from 6.5% by mass to 12.5% by mass based on the total amount of the film. The film for food packaging according to the first or second aspect of the invention, wherein the thermoplastic resin is selected from the group consisting of a polyvinyl chloride resin, a polyvinylidene chloride resin, a polyolefin resin, and a polystyrene resin. At least one of the group consisting of a resin, a polyester resin, and a polyamide resin. A small-film film for food packaging with a color box, comprising the film for food packaging according to any one of claims 1 to 3, and the core material of the film for food packaging, And a color box in which the film for food packaging and the core material are accommodated, and a blade portion for cutting the film for food packaging is provided in the color box.