JP7261293B2 - RESIN COMPOSITION, WRAP FILM AND WRAP FILM CONTAINER - Google Patents

Description

TECHNICAL FIELD The present invention relates to a resin composition, a wrap film and a wrap film container.

Wrapping films are widely used for commercial purposes in hotels, restaurants, etc., and for food storage and cooking at home. In order to improve the performance of wrap films, the types of resins constituting the wrap films and the types of additives such as plasticizers, anti-fogging agents and stabilizers have been devised.

For example, in Patent Document 1, a vinyl chloride resin, a specific modified epoxidized vegetable oil, and a weight average molecular weight of 3000 to 10000 are used to form a wrap film having thermal stability, low elution (safety), etc. and a polyester compound (polyester plasticizer) in a predetermined proportion.

Further, for example, in Patent Document 2, as a food packaging stretch film having excellent cold resistance etc., a resin composition made of an olefinic thermoplastic elastomer is used as a core layer, and at least one surface of the core layer is coated with a linear low-stretch film. A food packaging stretch film is disclosed in which a surface layer is formed by adding low-density polyethylene and polyoxyethylene sorbitan fatty acid ester in a predetermined ratio to high-density polyethylene.

JP 2013-119624 A Japanese Patent Application Laid-Open No. 2004-209696

According to the studies of the present inventors, it is difficult to achieve both cold resistance and low elution properties of the wrap film obtained from the resin composition while improving thermal stability with conventional resin compositions. .

Therefore, the present invention is made in view of the above circumstances, and provides a resin composition that is excellent in thermal stability and capable of forming a wrap film that can achieve both cold resistance and low elution. With the goal. Another object of the present invention is to provide a wrap film obtained from the resin composition and a wrap film container provided with the wrap film.

The present inventors have found that by using a compound having a specific functional group and molecular weight, it is possible to improve the thermal stability of the resin composition and to form a wrap film that can achieve both cold resistance and low elution. I found that

One aspect of the present invention relates to a resin composition containing a thermoplastic resin and a compound having an ester group and an epoxy group, wherein the compound has an average molecular weight of 300 or more and 1500 or less.

式（１）中、Ｒ^１及びＲ^４はそれぞれ独立にアルキル基を表し、Ｒ^２及びＲ^３はそれぞれ独立にアルキレン基を表し、ｍ及びｎはそれぞれ独立に０以上の整数を表し、ｍ及びｎの少なくとも一方は１以上の整数である。The compound may be a compound represented by the following formula (1).

In formula (1), R ¹ and R ⁴ each independently represent an alkyl group, R ² and R ³ each independently represent an alkylene group, m and n each independently represent an integer of 0 or more, m and At least one of n is an integer of 1 or more.

m in formula (1) may be 1 and n in formula (1) may be 0.

R ¹ in formula (1) may be an alkyl group having 3 to 12 carbon atoms, or may be an alkyl group having 6 to 8 carbon atoms. It may be an alkyl group having 8 carbon atoms.

R ² in formula (1) may be an alkylene group having 3 to 12 carbon atoms, an alkylene group having 6 to 8 carbon atoms, or an alkylene group having 7 carbon atoms.

R ⁴ in formula (1) may be an alkyl group having 3 to 12 carbon atoms, may be an alkyl group having 6 to 8 carbon atoms, may be an alkyl group having 7 carbon atoms, and may be represented by the following formula (2 ) may be an alkyl group represented by

The compound may be a compound represented by the following formula (3).

Another aspect of the present invention is a wrap film comprising a layer comprising the above resin composition. Wrap films may be used for food packaging.

Another aspect of the present invention is a wrap film container comprising a core, the wrap film wound around the core, and a box housing the core and the film.

ADVANTAGE OF THE INVENTION According to the present invention, there are provided a resin composition that is excellent in thermal stability and can achieve both cold resistance and low elution, a wrap film made of the resin composition, and a wrap film container comprising the wrap film. can be done.

1 is a perspective view showing a wrap film container according to one embodiment; FIG.

BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, embodiments of the present invention will be described in detail with appropriate reference to the drawings.

A resin composition according to one embodiment contains a thermoplastic resin. Thermoplastic resins include polyester resins such as polyethylene terephthalate, polyethylene naphthalate, and polybutylene terephthalate; polyamide resins such as 6-nylon, 6,6-nylon, and 12-nylon; butadiene-styrene copolymers, acrylonitrile-styrene Polystyrene resins such as copolymers, polystyrene, styrene-butadiene-styrene copolymers, styrene-isoprene-styrene copolymers, styrene-acrylic acid copolymers; saponified products of polyethylene, polypropylene, ethylene-vinyl acetate copolymers Polyolefin-based resins such as polyvinyl chloride; polyvinyl chloride-based resins such as polyvinyl chloride; polyvinylidene chloride-based resins such as polyvinylidene chloride. The thermoplastic resin is preferably polyvinyl chloride-based resin, polyvinylidene chloride-based resin or polyolefin-based resin, more preferably polyvinyl chloride-based resin, polyvinylidene chloride-based resin or polyethylene, from the viewpoint of excellent handleability. It is a system resin.

As the polyvinyl chloride-based resin, a polyvinyl chloride-based resin having an average degree of polymerization of 700 to 1,300 is preferable from the viewpoint of excellent moldability, heat resistance, and fluidity during wrap film molding. The average degree of polymerization in this specification means the average degree of polymerization measured according to JIS K6720-2.

The polyvinyl chloride resin may be a vinyl chloride homopolymer (polyvinyl chloride resin) from the viewpoint of excellent mechanical properties, and for the purpose of imparting other properties, vinyl chloride and other copolymerizable with it may be used. It may be a copolymer with a monomer. The copolymers may be graft copolymers, block copolymers or random copolymers. Examples of other monomers include olefins such as ethylene, propylene and butene; vinyl esters of saturated acids such as vinyl acetate and vinyl laurate; alkyl esters of unsaturated acids such as methyl acrylate and methyl methacrylate; alkyl vinyl ether such as vinyl ether; maleic acid, acrylonitrile, styrene, methylstyrene, vinylidene fluoride; and the like. When the polyvinyl chloride resin is a copolymer, the content of vinyl chloride units in the copolymer may be 10% by mass or more based on the total amount of monomer units, and preferably 30% from the viewpoint of excellent mechanical properties. It is at least 50% by mass, more preferably at least 50% by mass. The upper limit of the content of vinyl chloride units in the copolymer is not particularly limited, and may be, for example, 99% by mass or less based on the total amount of monomer units.

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

The polyvinylidene chloride resin may be a vinylidene chloride homopolymer (polyvinylidene chloride resin), for example, a copolymer containing vinylidene chloride and other monomers copolymerizable with vinylidene chloride as monomer units. you can Other monomers include vinyl chloride, acrylic acid esters of acrylic acid and alcohols having 1 to 8 carbon atoms, methacrylic acid esters of methacrylic acid and alcohols having 1 to 8 carbon atoms, vinyl esters of aliphatic carboxylic acids, unsaturated They may be aliphatic carboxylic acids, olefins, vinyl ethers, and the like. Copolymers of vinylidene chloride and vinyl chloride shall belong to polyvinylidene chloride-based resins.

The content of the vinylidene chloride unit in the polyvinylidene chloride resin is, for example, 60% by mass or more, 70% by mass or more, or 80% by mass, based on the total amount of the monomer units, from the viewpoint of moldability and heat resistance during wrap film molding. or more. The upper limit of the content of vinylidene chloride units in the polyvinylidene chloride resin is not particularly limited, and may be, for example, 99% by mass or less based on the total amount of monomer units. The vinylidene chloride unit content can be measured with a nuclear magnetic resonance (NMR) device.

The weight average molecular weight of the polyvinylidene chloride resin may be, for example, 40,000 or more, 60,000 or more, or 80,000 or more, and may be 180,000 or less, 160,000 or less, or 140,000 or less. The weight average molecular weight of the polyvinylidene chloride resin can be measured by the GPC method using polystyrene with a known molecular weight as a standard substance.

The conditions of the GPC method used for measuring the weight average molecular weight of the polyvinylidene chloride resin are as follows. A gel chromatograph Alliance GPC2000 model manufactured by Waters Co. is used as a measuring device. A polyvinylidene chloride resin dissolved in tetrahydrofuran to a concentration of 0.5% by mass is used as a sample.

Column: TSKgel GMHHR-H (S) HT 30 cm × 2 manufactured by Tosoh Corporation, TSKgel GMH6-HTL 30 cm × 2
Mobile phase: Tetrahydrofuran Detector: Differential refractometer Flow rate: 1.0 mL/min Column temperature: 20°C
Injection volume: 500 μL

Examples of polyolefin-based resins include polyethylene-based resins, and polyethylene-based resins include low-density polyethylene, linear low-density polyethylene, linear ultra-low-density polyethylene, medium-density polyethylene, high-density polyethylene, ethylene, etc. as monomer units. It may be a copolymer that Specifically, polyethylene-based resins include ethylene and propylene, 1-butene, 1-pentene, 1-hexene, 4-methyl-1-pentene, 1-heptene, 1-octene, etc. having 3 to 10 carbon atoms. α-olefins, vinyl esters such as vinyl acetate and vinyl propionate; unsaturated carboxylic acid esters such as methyl acrylate, ethyl acrylate, methyl methacrylate and ethyl methacrylate; unsaturated compounds such as conjugated dienes and non-conjugated dienes; It may be a copolymer with one or two or more selected from. The content of ethylene units in the polyethylene-based resin may be 50% by mass or more based on the total amount of monomer units.

The content of the thermoplastic resin may be 70% by mass or more, or 75% by mass or more, and 85% by mass or less, or 80% by mass or less, based on the total amount of the resin composition, from the viewpoint of excellent productivity during wrap film molding. can be

The resin composition contains a compound having an ester group and an epoxy group (hereinafter also referred to as "compound A") in addition to the thermoplastic resin. When the resin composition contains this compound, the thermal stability of the resin composition is improved. It is speculated that this compound A can function as a plasticizer by having an ester group, and can contribute to improving the thermal stability of the resin composition by having an epoxy group.

Compound A has a molecular weight of 300 or more and 1500 or less. When the molecular weight of the compound A is within the above range, it is possible to obtain a wrap film that achieves both cold resistance and low elution properties, in addition to improving the thermal stability of the resin composition. The molecular weight of compound A is preferably 330 or more, more preferably 360 or more, still more preferably 390 or more, and may be 400 or more or 500 or more, from the viewpoint of further excellent low dissolution properties. In addition, the molecular weight of compound A is preferably 1400 or less, more preferably 1200 or less, still more preferably 1000 or less, from the viewpoint of further improving cold resistance.

Compound A may be a compound represented by the following formula (1).

In formula (1), R ¹ and R ⁴ each independently represent an alkyl group, and R ² and R ³ each independently represent an alkylene group. In formula (1), m and n represent integers of 0 or more, and at least one of m and n is an integer of 1 or more.

The alkyl group represented by R ¹ may be linear or branched. The number of carbon atoms in the alkyl group represented by R ¹ may be, for example, 2 or more, preferably 3 or more, 4 or more, or 5 or more, more preferably 6 or more, from the viewpoint of further excellent low elution properties. . In addition, the number of carbon atoms in the alkyl group represented by R ¹ is, for example, 15 or less, 14 or less, or 13 or less, and from the viewpoint of further excellent cold resistance, preferably 12 or less, 11 or less, 10 or less, or 9 or less, and more It is preferably 8 or less. The alkyl group may be a linear alkyl group having 8 carbon atoms (n-octyl group) or a branched alkyl group having 8 carbon atoms.

The alkylene group represented by R ² or R ³ may be linear or branched. The number of carbon atoms in the alkylene group represented by R ² or R ³ may be, for example, 2 or more, preferably 3 or more, 4 or more, or 5 or more, more preferably 6, from the viewpoint of further excellent low elution properties. 7 or more, more preferably 7 or more. In addition, the number of carbon atoms in the alkylene group represented by R ² or R ³ may be, for example, 15 or less, 14 or less, or 13 or less, and from the viewpoint of further excellent cold resistance, preferably 12 or less, 11 or less, It is 10 or less, or 9 or less, more preferably 8 or less, and still more preferably 7 or less. The alkylene group may be a linear alkylene group having 7 carbon atoms (n-heptylene group) or a branched alkylene group having 7 carbon atoms.

The alkyl group represented by ^R4 may be linear or branched. The number of carbon atoms in the alkyl group represented by R ⁴ may be, for example, 2 or more, preferably 3 or more, 4 or more, or 5 or more, more preferably 6 or more, from the viewpoint of further excellent low elution properties. . In addition, the number of carbon atoms in the alkyl group represented by R ⁴ may be, for example, 15 or less, 14 or less, or 13 or less, and from the viewpoint of further excellent cold resistance, preferably 12 or less, 11 or less, 10 or less, or 9 or less, more preferably 8 or less. The alkyl group may be a linear alkyl group having 7 carbon atoms (n-heptyl group) or a branched alkyl group having 7 carbon atoms. The branched alkyl group having 7 carbon atoms may be, for example, an alkyl group represented by the following formula (2).

m may be an integer of 1 or more, 2 or more, or 3 or more, and may be an integer of 3 or less, 2 or less, or 1 or less.

n may be an integer of 1 or more, 2 or more, or 3 or more, and may be an integer of 3 or less, 2 or less, or 1 or less.

式（１－１）中、Ｒ^１、Ｒ^２及びＲ^４は、式（１）中のＲ^１、Ｒ^２及びＲ^４とそれぞれ同義である。In one embodiment, compound A may be a compound represented by the following formula (1-1) (a compound in which m is 1 and n is 0 in formula (1)).

In formula (1-1), R ¹ , R ² and R ⁴ have the same definitions as R ¹ , R ² and R ⁴ in formula (1).

In one embodiment, compound A is a compound represented by the following formula (3) (in formula (1-1), R ¹ is an n-octyl group, R ² is an n-heptylene group, and R ⁴ is the formula (2) which is an alkyl group).

The content of compound A is preferably 2% by mass, based on the total amount of the resin composition, from the viewpoint of further improving the thermal stability of the resin composition and further improving the low elution property and cold resistance of the wrap film. Above, 5% by mass or more, 8% by mass or more, 9% by mass or more, or 10% by mass or more, for example, may be 25% by mass or less or 20% by mass or less, from the viewpoint of excellent film formability of the wrap film Therefore, it is preferably 15% by mass or less, 14% by mass or less, 13% by mass or less, 12% by mass or less, or 11% by mass or less.

Compound A is synthesized, for example, by reacting an unsaturated fatty acid with an aliphatic alcohol to give an ester having at least one carbon-carbon double bond, followed by epoxidation of the carbon-carbon double bond. can do.

The resin composition may further contain acetylated monoglyceride. Acetylated monoglyceride may be, for example, a compound in which two hydroxyl groups of glycerin are acetylated and the remaining one is esterified with a fatty acid. The fatty acid may be, for example, a 3-8 carbon fatty acid.

The content of acetylated monoglyceride is 0.5% by mass or more, 0.7% by mass or more, 1% by mass or more, 1.5% by mass or more, 3% by mass or more, and 4% by mass or more based on the total amount of the resin composition. , or 5% by mass or more, and may be 10% by mass or less, 9% by mass or less, or 8% by mass or less.

The resin composition may further contain a polycarboxylic acid ester. A polyvalent carboxylic acid ester is an ester of a polyvalent carboxylic acid and an alcohol. Polyvalent carboxylic acids may be, for example, divalent to tetravalent carboxylic acids. The alcohol may be, for example, a C1-C10 aliphatic alcohol.

Polyvalent carboxylic acids may be, for example, aliphatic polyvalent carboxylic acids. That is, the polycarboxylic acid ester may be an aliphatic polycarboxylic acid ester that is an ester of an aliphatic polycarboxylic acid and an alcohol. An aliphatic polycarboxylic acid may be, for example, adipic acid. That is, the aliphatic polyvalent carboxylic acid ester may be, for example, a diester of adipic acid and an alcohol, a diester of adipic acid and an aliphatic alcohol having 1 to 10 carbon atoms, or dioctyl adipate. you can

The polyvalent carboxylic acid may be, for example, a hydroxy polyvalent carboxylic acid that is a polyvalent carboxylic acid having a hydroxyl group. That is, the polycarboxylic acid ester may be a hydroxypolycarboxylic acid ester that is an ester of a hydroxypolycarboxylic acid and an alcohol. A hydroxy polycarboxylic acid may be, for example, citric acid. That is, the hydroxy polycarboxylic acid ester may be a triester of citric acid and an alcohol. The hydroxyl group of the hydroxypolycarboxylic acid ester may be acetylated. The hydroxy polycarboxylic acid ester may be an acetylated hydroxy polycarboxylic acid ester, an acetylated citric acid triester, or an acetylated citric acid trialkyl ester. The acetylated citric acid trialkyl ester may be, for example, acetylated tributyl citrate.

Polyvalent carboxylic acid may be, for example, cyclohexane polyvalent carboxylic acid, which is a polyvalent carboxylic acid having a cyclohexane ring. That is, the polyvalent carboxylic acid ester may be a cyclohexane polyvalent carboxylic acid ester which is an ester of cyclohexane polyvalent carboxylic acid and alcohol. A cyclohexane polycarboxylic acid may be, for example, a cyclohexanedicarboxylic acid. That is, the cyclohexane polyvalent carboxylic acid ester may be a diester of cyclohexanedicarboxylic acid and an alcohol, or may be a cyclohexanedicarboxylic acid dialkyl ester. The cyclohexanedicarboxylic acid dialkyl ester can be, for example, 1,2-cyclohexanedicarboxylic acid diisononyl ester.

The content of the polyvalent carboxylic acid ester, based on the total amount of the resin composition, may be 1% by mass or more, 2% by mass or more, 3% by mass or more, 4% by mass or more, or 5% by mass or more, and 15% by mass. 13% by mass or less, 10% by mass or less, 9% by mass or less, or 8% by mass or less.

The resin composition may further contain an epoxidized vegetable oil. The epoxidized vegetable oil may be epoxidized soybean oil, epoxidized linseed oil, and the like. The content of the epoxidized vegetable oil may be 3% by mass or more, 4% by mass or more, or 5% by mass or more, and is 10% by mass or less, 9% by mass or less, or 8% by mass or less, based on the total amount of the resin composition. can be

The resin composition may further contain a glycerin fatty acid ester. Glycerin fatty acid esters may be, for example, esters of glycerin with saturated fatty acids such as stearic acid or unsaturated fatty acids such as oleic acid. Glycerin fatty acid esters may be any of monoesters, diesters and triesters. The content of the glycerin fatty acid ester, based on the total amount of the resin composition, may be 0.5% by mass or more, 1% by mass or more, or 1.5% by mass or more, and 10% by mass or less, 7% by mass or less, or It may be 5% by mass or less.

The resin composition may further contain other additives in addition to the thermoplastic resin, compound A and each additive described above. Other additives include anti-fogging agents, stabilizers (Ca/Zn-based stabilizers, etc.), colorants, plasticizers, lubricants, fillers, plate-out inhibitors, antioxidants, release agents, and viscosity reducers. , surfactants, fluorescent agents, surface treatment agents, cross-linking agents, processing aids, adhesives, antistatic agents, ultraviolet absorbers, antiblocking agents and the like. When the resin composition contains other additives, the content (total content) of the other additives may be, for example, 1% by mass or more and 30% by mass or less.

The resin composition is suitably used for wrap films. That is, one embodiment of the present invention is a wrap film comprising a layer made of the above resin composition. This wrap film can reduce the elution amount of additives into foods, and is therefore particularly suitable for packaging foods. In addition, since this wrap film is excellent in cold resistance, it is also suitable for use at low temperatures (for example, 0° C. or lower) such as frozen storage of food.

The wrap film may consist of a single layer containing the thermoplastic resin and the compound A, or may consist of a plurality of layers. When the wrap film consists of a plurality of layers, the wrap 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 and second surface layers contain a thermoplastic resin, compound A, and optionally added additives, and the intermediate layer contains a thermoplastic resin and optionally added additives. It may contain an agent. For example, the wrap film may further include an adhesive layer containing an acid-modified polyolefin resin or the like in order to improve the adhesion between each layer, and a polyamide-based resin may be added in order to improve the heat resistance of the wrap film. You may further provide the heat-resistant layer to contain.

The thickness of the wrap film is preferably 5 μm or more, more preferably 6 μm or more, from the viewpoint of efficiently shielding the food from the outside air, and is preferably 25 μm or less, more preferably 25 μm or less, more preferably from the viewpoint of excellent handleability. It may be 12 μm or less.

From the viewpoint of excellent visibility, the total light transmittance of the wrap film is preferably 75% or more, more preferably 80% or more, and may be, for example, 90% or less. The total light transmittance can be calculated by measuring the incident light amount and the total transmitted light amount according to JIS K7361-1 and calculating the total light transmittance=(total transmitted light amount)/(incident light amount)×100.

For the wrap film, for example, the thermoplastic resin, compound A, and, if necessary, the above additives are mixed with a mixer such as a V-type blender, a ribbon blender, a Henschel mixer, or a super mixer, and further mixed as necessary. After obtaining a composition by kneading with a kneader such as a roll, a Banbury mixer, or a kneader, it is produced by, for example, extrusion molding. Specifically, the composition is supplied to the hopper of an extruder, and the desired wrap film is obtained by an inflation method, a T-die method, or the like.

When the wrap film consists of a plurality of layers, the wrap film is obtained by putting the constituent raw materials of each layer into separate extruders, melt extruding them, and coextrusion and laminating each layer by an inflation method, a T-die method, or the like. be done. At this time, it is preferable to form the wrap film by drawing the melt extruded from the T-die as it is while quenching it with a casting roll or the like.

For the wrap film obtained in this way, longitudinal stretching between heating rolls, various heat setting depending on the purpose such as reduction of heat shrinkage, natural shrinkage, etc. , A heat treatment such as aging may be performed, and corona treatment; aging treatment; surface treatment such as printing and coating; surface treatment; good.

For example, the wrap film is formed into a long length and wound up, then further rewound (wound) for each desired length such as 20 m, 50 m, etc., and packed in a box to make a product. be. That is, the wrap film in this embodiment may be in the form of a wrap film wound around a core or in the form of a wrap film housed in a box.

FIG. 1 is a perspective view showing a wrap film container according to one embodiment. As shown in FIG. 1, a wrap film container 1 according to one embodiment includes a wrap film 2, a core 3 around which the wrap film is wound, and a box 4 that houses the wrap film 2 and the core 3. It has The box 4 may be provided with a blade portion 5 for cutting the wrap film 2 . Materials for the winding core 3 and the box body 4 are not particularly limited. From the viewpoint of easily recognizing the color of the wrap film from the outside, at least a part of the box 4 is preferably transparent or has holes to the extent that the function as a box is not impaired, so that the inside can be seen from the outside. It has become.

In general, "film" refers to a thin, flat product whose thickness is extremely small compared to its length and width, and whose maximum thickness is arbitrarily limited, and which can be supplied in the form of rolls (if required). If so, Japanese Industrial Standard JIS K6900 can be referred to.) Generally, the term "sheet" as defined in JIS refers to a thin, flat product whose thickness is relatively small relative to its length and width. However, the boundary between a sheet and a film is not clear, and there is no need to distinguish between the two in terms of terms in this embodiment. "Film" shall be included even when it is called. In addition, the "film" is a concept that particularly includes wrap films among the above definitions.

EXAMPLES The present invention will be described in more detail based on examples below, but the present invention is not limited to the examples.

Resin compositions having the compositions shown in Tables 1 and 2 were prepared using the following thermoplastic resins and additives. Specifically, after putting each component into a super mixer, the material temperature was raised from room temperature to 130° C. while stirring, and mixed to obtain a resin composition. The remainder obtained by subtracting the total content of each component other than the polyvinyl chloride resin (thermoplastic resin) from 100% by mass is the content of the polyvinyl chloride resin (thermoplastic resin). In addition, the content of each component means mass % in terms of solid content.

添加剤ａ１：アジピン酸ジイソノニル（分子量：３９９）
添加剤ａ２：ポリエステル系可塑剤（重量平均分子量：４０８０、アジピン酸系ポリエステル）
添加剤Ｂ１：エポキシ化大豆油
添加剤Ｂ２：アセチル化モノグリセライド
添加剤Ｂ３：グリセリン脂肪酸エステル
添加剤Ｂ４：Ｃａ／Ｚｎ系安定剤Thermoplastic resin: polyvinyl chloride resin (manufactured by Taiyo Vinyl Co., Ltd., "TH-1000", average degree of polymerization: 1000)
Additive A: compound represented by the following formula (3) (2-ethylpentane 9,10-epoxyoctadecanoate, molecular weight: 396)

Additive a1: diisononyl adipate (molecular weight: 399)
Additive a2: polyester plasticizer (weight average molecular weight: 4080, adipic acid polyester)
Additive B1: Epoxidized Soybean Oil Additive B2: Acetylated Monoglyceride Additive B3: Glycerol Fatty Acid Ester Additive B4: Ca/Zn Stabilizer

(Evaluation of thermal stability)
60 g of each resin composition thus obtained was added to a roller mixer R60 type attached to Laboplastomill (manufactured by Toyo Seiki Seisakusho Co., Ltd., "4C150-01"), kneaded at 210 ° C. and 60 rpm, and dynamic thermal stability time By measuring the dynamic thermal stability of the resin composition was evaluated. The dynamic thermal stability time was defined as the time required to reach 150% torque value from the steady torque value. The longer the dynamic thermal stability time, the better the thermal stability. A dynamic thermal stability time of 22 minutes or more was evaluated as "A", a case of 17 minutes or more and less than 22 minutes was evaluated as "B", and a case of less than 17 minutes was evaluated as "C". Results are shown in Tables 1 and 2. If the evaluation is A, the thermal stability is excellent, if the evaluation is B, the thermal stability is poor, and if the evaluation is C, the thermal stability is extremely poor.

(Production of wrap film)
Each resin composition was taken out when cooled to 70 ° C., and a single-screw extruder with a diameter of 40 mm (L / D = 20) equipped with a T-die (width 350 mm, gap 0.4 mm) was used to increase the temperature of the resin composition. was extruded at a temperature of 200° C. to prepare a wrap film having a thickness of 8 μm.

(Evaluation of cold resistance)
The obtained wrap film was cut into a width of 4 cm and a length of 11 cm, and then folded into four to obtain a test piece with a width of 1 cm. The elastic modulus at low temperature was measured by subjecting the obtained test piece to a tensile test in an indoor environment of 0° C. and 0% humidity at a chuck distance of 5 cm, a speed of 50 mm/min, and a measurement distance of 20 mm. It can be said that the smaller the numerical value of the elastic modulus at low temperature, the better the cold resistance. The elastic modulus was evaluated as "A" when it was less than 900 Mpa, as "B" when it was 900 Mpa or more and less than 1000 Mpa, and as "C" when it was 1000 Mpa or more. Results are shown in Tables 1 and 2. If the evaluation is A, the cold resistance is very excellent, if the evaluation is B, the cold resistance is excellent, and if the evaluation is C, the cold resistance is poor.

(Evaluation of additive elution amount (heptane elution amount))
A sample of a certain area was cut from the wrap film, immersed in 2 mL of heptane solution per 1 cm ² of its surface area at a temperature of 25° C. for 1 hour, the solution was evaporated to dryness, and the weight was measured to determine the transfer from the film to the heptane solution. A migration amount was obtained. It can be said that the smaller the amount of migration, the more the elution amount of the additive can be suppressed. Results are shown in Tables 1 and 2. Comparative Examples 2 and 4, which are inferior in thermal stability and cold resistance, were excluded from this evaluation.

DESCRIPTION OF SYMBOLS 1... Wrap film container, 2... Wrap film, 3... Core, 4... Box body, 5... Blade part.

Claims (4)

A resin composition containing a polyvinyl chloride resin and a compound represented by the following formula (3) .

A wrap film comprising a layer comprising the resin composition according to claim 1 . The wrap film according to claim 2 , which is used for packaging food. a winding core;
The wrap film according to claim 2 or 3 , which is wound around the winding core;
A wrap film container comprising: a box for containing the winding core and the film.

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