JP2016190654A - Plastic container for oily content - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a plastic container for oily content excellent in slippage, when an oily matter such as mayonnaise, particularly, an oily content such as calorie-off mayonnaise containing viscosity improver is accommodated.SOLUTION: A plastic container 1 for oily content has a layer 2 contacting at least a content which is formed of a resin composition formed by adding silicone to a polyolefin resin, and accordingly is excellent in slippage of the layer 2 contacting the content, and can smoothly drop and discharge the content even when the content is a viscous oily matter such as calorie-off mayonnaise containing viscosity improver. In the container 1, the layer 2 contacting the content is used as an innermost layer 2, a gas barrier layer 3 may be formed between an outermost layer 4 formed of a resin composition formed by adding a lubricant to the polyolefin resin and the innermost layer 2, and a reproduced layer 5 may be further formed between the gas barrier layer 3 and the innermost layer 2.SELECTED DRAWING: Figure 3

Description

  The present invention relates to a plastic container for oily contents. More specifically, the present invention relates to a plastic container for oily contents used for containing an oily substance containing oil and fat such as mayonnaise.

  As a container for containing a viscous slurry-like or paste-like oily substance such as mayonnaise, a container in which the inner surface of the container wall is formed of a polyolefin resin is often used. For plastic containers that contain viscous contents, use the contents of the container inside the container quickly to the outside without leaving it in the container, or without leaving it inside the container. For this reason, the container is often inverted and stored in a refrigerator or the like, and when the container is inverted, the contents do not remain attached to the inner wall surface of the container, and the viscous contents quickly fall off. Is desired. In addition, the calorie-off mayonnaise that has recently appeared on the market has a low fat content and a thickener added in consideration of the mouthfeel, etc. There is a demand for such a container having good sliding properties because objects are likely to adhere and remain on the inner wall surface of the container.

  For example, what added fatty acid amide as a lubrication agent to the resin which comprises the layer (innermost layer) which contact | connects the contents which comprise a container is provided. On the other hand, when a lubricant such as fatty acid amide as described above is added, the lubricant is a compound having a lipophilic group, and has a high affinity for oily contents such as mayonnaise. On the other hand, there is a problem that the sliding property with respect to the oily contents is lowered, and it is difficult to discharge the oily contents cleanly.

  On the other hand, a plastic container for oily contents composed of a layer made of a polyolefin-based resin that does not contain a lubricant (a lubricant is free) has been proposed for the innermost layer constituting the container (see, for example, Patent Document 1). .

Japanese Patent No. 5321122

  However, when the innermost layer does not contain a lubricant, it is necessary to set the melt flow rate (MFR) and density of the polyolefin resin constituting the innermost layer within a specific range. In some cases, the resulting sliding property was insufficient. In addition, since polyolefin resins are oily with no polarity, only such resins have an affinity with oily substances and are one of the factors that prevent the contents from slipping.

  The present invention has been made in view of the above problems, and when containing oily substances such as mayonnaise, particularly oily substances such as calorie-off mayonnaise containing a thickening agent, the sliding property of the layer in contact with the contents can be reduced. The object is to provide a plastic container for good oily contents.

  In order to solve the above problems, a plastic container for oily contents according to the present invention is a plastic container for oily contents for containing oily contents, and at least a layer in contact with the contents is a polyolefin It consists of a resin composition in which silicone is added to a system resin.

  The plastic container for oily contents according to the present invention is characterized in that, in the above-described present invention, the weight average molecular weight of the silicone is 1,000,000 or more.

  The plastic container for oily contents according to the present invention is characterized in that, in the above-described present invention, the silicone is an organopolysiloxane.

  The plastic container for oily contents according to the present invention is the above-mentioned present invention, wherein the layer in contact with the contents is the innermost layer, and the outermost layer is made of a resin composition obtained by adding a lubricant to a polyolefin resin, and the outermost layer and A gas barrier layer is provided between the innermost layers,

  In the plastic container for oily contents according to the present invention, at least the layer in contact with the contents is composed of a resin composition in which silicone is added to the polyolefin resin, so that the layer in contact with the contents has good sliding properties, Even if the contents are viscous oily substances such as calorie off mayonnaise containing a thickener, the contents can be smoothly dropped and discharged.

It is the schematic which showed the one aspect | mode of the plastic container for oily contents which concerns on this invention. It is AA sectional drawing of FIG. It is the figure which showed the other aspect of FIG.

  Hereinafter, one aspect of the plastic container 1 for oily contents according to the present invention will be described.

  FIG. 1 is a schematic view showing an embodiment of a plastic container 1 for oily contents according to the present invention. As shown in FIG. 1, a plastic container 1 for oily contents (hereinafter sometimes simply referred to as “container 1”) is a container 1 for containing oily contents such as mayonnaise, and at least The layer 2 (see FIG. 2 etc.) in contact with the contents is formed by molding a resin composition in which silicone is added to a polyolefin resin. The plastic container 1 for oil-based contents shown in FIG. 1 is a container in which the contents are squeezed out from a spout 12 formed with a screw thread 11 by squeezing the body 14 or the like. 13 is mounted and sealed.

(Layer 2 in contact with contents)
In the present invention, the layer 2 in contact with the contents uses a polyolefin resin. Examples of the polyolefin resin include polyethylene resins such as low density polyethylene (LDPE), linear low density polyethylene (LLDPE), medium density polyethylene (MDPE), and high density polyethylene (HDPE), polypropylene resins, poly-1 -Butene, poly-4-methyl-1-pentene and the like. Further, it may be a random or block copolymer of α-olefins such as ethylene, propylene, 1-butene, 4-methyl-1-pentene, and so on. Furthermore, a so-called cyclic olefin resin (cycloolefin polymer (COP) : Cyclo-Olefin Polymer)) or a so-called cyclic olefin copolymer (COC: Cyclo-Olefin Polymer) which is a copolymer of a cyclic olefin and an α-olefin (chain olefin) or the like. ) Etc. can be used. One of these polyolefin resins may be used alone, or two or more thereof may be used in combination. As the polyolefin resin, it is preferable to use a polyethylene resin or a polypropylene resin, and it is particularly preferable to use a polyethylene resin. And it is preferable to use polyethylene resin or polypropylene resin as the main component in the resin component, and it is particularly preferable to use polyethylene resin as the main component in the resin component. 50% by mass or more, preferably 80% by mass or more, particularly preferably 100% by mass (all).

  Examples of the polyethylene resin include polyethylene resins such as low density polyethylene (LDPE), linear low density polyethylene (LLDPE), medium density polyethylene (MDPE), and high density polyethylene (HDPE). Further, an ethylene / α-olefin copolymer which is a random or block copolymer of ethylene and α-olefins such as propylene, 1-butene and 4-methyl-1-pentene may be used. One of these polyethylene resins may be used alone, or two or more thereof may be used in combination. As the polyethylene-based resin, it is preferable to use low-density polyethylene (LDPE) or linear low-density polyethylene (LLDPE) in consideration of transparency, squeezeability (drawability), and the like.

When using low density polyethylene (including linear low density polyethylene), the density is preferably 0.915 to 0.930 g / cm ³ . Moreover, it is preferable that the melt flow rate (MFR) in 190 degreeC shall be 0.2-2.0 g / 10min.

  Silicone (including a silicone compound) is added to and mixed with the polyolefin resin. By forming a resin composition in which silicone is added and mixed, the sliding property of the layer 2 in contact with the contents becomes good.

  Examples of the silicone to be added include organopolysiloxane (polyorganosiloxane), and the molecular structure may be linear (linear) or partially branched. Among organopolysiloxanes, It is preferred to use diorganopolysiloxane.

  Examples of the silicon-bonded organic group of the diorganopolysiloxane include an alkyl group such as a methyl group, an ethyl group, a propyl group, a 3-chloropropyl group, and a 3,3,3-trifluoropropyl group; a cyclopentyl group, a cyclohexyl group, and the like. Cycloalkyl groups: aryl groups such as phenyl, tolyl and xylyl groups; aralkyl groups such as benzyl, phenethyl and 3-phenylpropyl groups; alkenyl groups such as vinyl, propenyl, butenyl and hexenyl Is done. Among them, an alkyl group, particularly a methyl group is preferable. A hydroxyl group or an alkoxy group may be bonded to the end of the diorganopolysiloxane. Examples of such a diorganopolysiloxane include a trimethylsiloxy group-blocked dimethylpolysiloxane at both ends, a silanol group-blocked dimethylpolysiloxane at both ends, dimethyl having one end blocked with a silanol group and the other end blocked with a trimethylsiloxy group. Polysiloxane, trimethylsiloxy group-capped methylphenyl polysiloxane, both ends trimethylsiloxy group-capped dimethylsiloxane / methylvinylsiloxane copolymer, both ends dimethylvinylsiloxy group-capped dimethylpolysiloxane, both ends trimethylsiloxy group-capped dimethylsiloxane / Examples thereof include a methylphenylsiloxane copolymer, a trimethylsiloxy group-blocked dimethylsiloxane / methyl (3,3,3-trifluoropropyl) siloxane copolymer at both ends. These may be used individually by 1 type, and may be used in combination of 2 or more type.

The weight average molecular weight (M _w ) of silicone is preferably 1 million (1000000) or more. When the weight average molecular weight of the silicone is 1 million or more, the silicone does not bleed out and transfer to the contents, and oily substances such as mayonnaise, especially oily substances such as calorie off mayonnaise containing a thickener. Good sliding properties can be maintained when the substance is contained. On the other hand, when the weight average molecular weight of the silicone is smaller than 1 million, the silicone bleeds out and moves to the contents, and the sliding property may be lowered. The weight average molecular weight of silicone is particularly preferably 1 million (1000000) to 10 million (10000000). In addition, the measurement of a weight average molecular weight can be performed by conventionally well-known methods, such as gel filtration chromatography, for example.

  Moreover, it is preferable that the viscosity of silicone is 6 million (6000000) cS or more, and it is especially preferable that it is 6 million (6000000)-10 million (10000000) cS.

  The content of silicone in the layer 2 in contact with the content is preferably 0.001 to 15.0% by mass, for example, with respect to the entire layer 2 in contact with the content (the resin composition constituting the layer 2). By making the addition amount of the lubricant within such a range, the sliding property is exhibited well. The lubricant is more preferably 0.05 to 6.0% by mass, more preferably 0.1 to 6.0% by mass, and more preferably 0.2 to 5.0% by mass with respect to the entire layer 2. It is particularly preferred that Silicone may be used as a masterbatch (MB) mixed with a base resin made of polyolefin resin such as polyethylene resin or polypropylene resin, or other resins. The silicone content should be adjusted to the above-mentioned range according to the ratio (usually, silicone is 10 to 70% by mass with respect to the entire masterbatch). The resin composition is preferably added in an amount of 0.01 to 20% by mass, particularly preferably 0.5 to 8.0% by mass, but is not particularly limited to this range. Further, the polyolefin-based resin becomes the remainder of the resin composition excluding silicone.

  Further, it is preferable that the layer 2 in contact with the contents (the same applies to the innermost layer 2 described later) substantially does not contain a fatty acid amide (saturated aliphatic amide, unsaturated aliphatic amide, etc.) type lubricant. As described above, when a fatty acid amide-based lubricant is added, the fatty acid amide is a compound having a lipophilic group and has a high affinity for oily contents such as mayonnaise. On the other hand, it is not preferable because it may lead to a decrease in slipping property with respect to the oily content. “Substantially free” means that these are not intentionally added and does not necessarily mean that they are not included at all. It is allowed to contain a trace amount. The specific content varies depending on, for example, the type of silicone, weight average molecular weight, viscosity, and the like, but is preferably less than 0.1% by mass with respect to the entire layer 2 in contact with the contents, and 0.01% by mass More preferably, it is particularly preferable that it is not contained at all.

  The plastic container 1 for oily contents according to the present invention requires the layer 2 in contact with the contents described above, and may be a single-layered container composed of the layer 2, but the slipperiness of the container 1 and preservation of the contents It is preferable to have a multilayer structure described below (adhesive resin layer 6 to be described later is not included as a layer here; the same shall apply hereinafter) for reasons such as improving the properties.

  FIG. 2 is a cross-sectional view taken along the line AA of FIG. 1 and shows a case where the multilayer structure is a three-layer structure. In the case of a three-layer structure, the layer 2 in contact with the contents may be the innermost layer 2 and the outermost layer 4 and the intermediate layer 3 made of a gas barrier layer may be formed into three layers. For example, a lubricant is added to a polyolefin resin. It is preferable that an intermediate layer 3 composed of a gas barrier layer 3 is provided between an outermost layer 4 made of the added resin and a layer (innermost layer) 2 in contact with the outermost layer 4 and the content.

  In the three-layer structure shown in FIG. 2, it is preferable that the adhesive resin layer 6 be interposed between the gas barrier layer 3 and the layer in contact with the gas barrier layer 3. The outermost layer 4 and the gas barrier layer (intermediate layer) 3, and the gas barrier layer (intermediate layer) 3 and the innermost layer 2 so as to be the outermost layer 4 / AD 61 / gas barrier layer (intermediate layer) 3 / AD 62 / innermost layer 2. It is preferable to interpose the adhesive resin layer 6 therebetween. In the three-layer structure shown in FIG. 2, the innermost layer 2 is common to the layer 2 in contact with the contents described above, and therefore, the outermost layer 4 and the gas barrier layer (intermediate layer) 3 will be described below.

(Outermost layer 4)
The outermost layer 4 is composed of a resin composition obtained by adding a lubricant to a polyolefin resin. By adding a lubricant, it becomes possible to exhibit slipperiness according to various environmental temperatures in each process of forming, transferring, and packaging the contents of the container 1, and slipping failure of the surface of the container 1 in each process. The problem due to can be eliminated. For the outermost layer 4, for example, a lubricant (particularly, a fatty acid amide-based lubricant described later) is added to the polyolefin resin in order to impart slipperiness in a food filling line mainly composed of a metal material such as stainless steel. It is preferable to use a resin composition which is added, mixed and kneaded.

  As the polyolefin resin, a polyolefin resin exemplified as the resin constituting the layer (innermost layer) 2 in contact with the above-described contents can be preferably used. As the polyolefin resin, it is preferable to use a polyethylene resin or a polypropylene resin, and it is particularly preferable to use a polyethylene resin. And it is preferable to use a polyethylene-type resin and a polypropylene-type resin as a main component in a resin component, and it is especially preferable to use a polyethylene-type resin as a main component in a resin component. As the polyethylene resin, the polyethylene resin exemplified in the layer (innermost layer) 2 in contact with the above-mentioned contents can be used. Low density polyethylene (in consideration of transparency, squeeze property (drawability), etc. LDPE) and linear low density polyethylene (LLDPE) are preferably used. About the density and MFR in the case of using low density polyethylene (including linear low density polyethylene), it is preferable to use the thing of the above-mentioned range.

  As the lubricant, for example, fatty acid amide (fatty acid amide-based lubricant) can be used. As fatty acid amides, saturated aliphatic amides and unsaturated aliphatic amides can be used, and saturated fatty amides (saturated fatty acid amides) include butyramide, hexylamide, decylamide, lauric acid amide, myristic acid amide, Examples include palmitic acid amide and stearic acid amide. Of these saturated aliphatic amides, stearic acid amide is preferably used. One of these saturated aliphatic amides may be used alone, or two or more thereof may be used in combination.

  Moreover, as unsaturated aliphatic amides (unsaturated fatty acid amides), acrylamide, methacrylamide, crotonamide, isocrotonamide, undecylenic acid amide, setoleic acid amide, oleic acid amide, erucic acid amide, ethylenebisoleic acid amide, Examples include oleyl palmitoamide, stearyl erucamide, linoleic acid amide, linolenic acid amide, and arachidonic acid amide. Among these, those having a carbon number in the range of 14 to 24, for example, celetinic acid amide, oleic acid amide, erucic acid amide, linoleic acid amide, linolenic acid amide, arachidonic acid amide, etc. are preferably used. Particular preference is given to using acid amides. One of these unsaturated aliphatic amides may be used alone, or two or more thereof may be used in combination.

  The content of a lubricant such as a fatty acid amide lubricant in the outermost layer 4 is preferably 500 to 100,000 ppm with respect to the entire outermost layer 4 (the resin composition constituting the outermost layer 4). By setting the addition amount of the lubricant within such a range, good slipperiness can be exhibited. The lubricant is particularly preferably set to 1000 to 50000 ppm with respect to the entire outermost layer 4 (the resin composition constituting the outermost layer 4). In addition, polyolefin resin becomes the remainder of the resin composition except a lubricant.

(Gas barrier layer (intermediate layer) 3)
As the intermediate layer 3 to be the gas barrier layer 3, for example, an ethylene vinyl alcohol copolymer (EVOH: refers to a saponified ethylene vinyl acetate copolymer), an aromatic polyamide, or the like can be used. It is preferable to use an ethylene vinyl alcohol copolymer having excellent properties. Since such an ethylene-vinyl alcohol copolymer exhibits excellent oxygen barrier properties, it is possible to effectively suppress oxidative deterioration of the content due to oxygen permeation, and the content storage stability and the like are also improved.

  As the above-described ethylene vinyl alcohol copolymer, an ethylene-vinyl acetate copolymer having an ethylene content of 20 to 60 mol%, particularly 25 to 50 mol%, is generally 96 mol% or more, particularly 99 mol%. It is preferable to use a saponified copolymer obtained by saponification so as to achieve the above.

  Further, when forming the innermost layer 2, the gas barrier layer (intermediate layer) 3, and the outermost layer 4, the repro resin generated when the container 1 is molded (the two constituting the innermost layer constituting the container 1, A layer made of a scrap resin in which all materials of the gas barrier layer (intermediate layer) 3, the outermost layer 4 and the adhesive resin layer 6 are mixed) is interposed between the innermost layer 2 and the gas barrier layer (intermediate layer) 3. A layer structure may be used.

  FIG. 3 is a diagram showing another embodiment of FIG. 2, and is a diagram showing a configuration in which a layer (repro layer) 5 made of Libro resin is formed between the innermost layer 2 and the gas barrier layer (intermediate layer) 3. It is. In the four-layer structure shown in FIG. 3, it is preferable that the adhesive resin layers 61 and 62 are interposed between the gas barrier layer 3 and the layer in contact with the gas barrier layer 3. The outermost layer 4, the gas barrier layer (intermediate layer) 3, the gas barrier layer (intermediate layer) 3 and the outermost layer 4 / AD61 / gas barrier layer (intermediate layer) 3 / AD62 / repro layer 5 / innermost layer 2 in order. Adhesive resin layers (AD) 61 and 62 are preferably interposed between the repro layer 5.

  The adhesive resin that can be used as the adhesive resin layers (AD) 61 and 62 is not particularly limited, and a conventionally known adhesive resin can be used. For example, maleic anhydride grafted polyethylene (maleic anhydride modified) Polyethylene), maleic anhydride-grafted polypropylene (maleic anhydride-modified polypropylene) and the like can be used corresponding to the type of polyolefin resin used. Also, carboxylic acid, carboxylic acid anhydride, ethylene-acrylic acid copolymer, ion-crosslinked olefin copolymer, acrylic acid grafted polyolefin, ethylene-vinyl acetate copolymer, copolyester, copolyamide, etc. may be used. it can. One of these adhesive resins may be used alone, or two or more thereof may be used in combination.

  Each of the above-described layers has, for example, a plasticizer, an antistatic agent, an antioxidant, an antifogging agent, an ultraviolet absorber, a heat stabilizer, a nucleating agent, a release agent, as long as the object and effect of the invention are not impaired. You may make it add various additives generally used in the field | area of a resin material, such as a mold agent, a coloring agent, and a neutralizing agent.

  In addition, although there is no restriction | limiting in particular in the thickness (for example, trunk | drum 14) of the whole container 1, It is preferable to set it as about 100-400 micrometers in general. Moreover, in the structure of FIG.2 and FIG.3, it is preferable that the innermost layer 2 becomes 5 to 15% of the thickness of the container 1 whole.

  The plastic container 1 for oily contents can be molded by a known molding method, and for example, can be molded by blow molding, injection molding or the like. For example, when blow molding is used, a melt preform (parison) is extruded from a multilayer die head by coextrusion molding, and known direct blow molding is performed, or a test tube container preform (parison) is formed by co-injection molding. ) And blow-molding such a preform.

(Effect of the present invention)
In the plastic container 1 for oily contents according to the present invention, at least the layer 2 in contact with the contents (the innermost layer 2 in the case of a multilayer structure) is made of a resin composition obtained by adding silicone to a polyolefin resin. Even if the layer (innermost layer) 2 in contact has good sliding properties and the content is a viscous oily substance containing a thickener, the content can be smoothly dropped and discharged. The container 1 which concerns on this invention can accommodate oily substances, such as mayonnaise and dressing, as a content, for example.

  In addition, the plastic container 1 for oily contents of the present invention can cope with calorie off mayonnaise as an oily substance as the contents, and when such a calorie off mayonnaise is used as the contents, the sliding property is good. The effect can be demonstrated. Here, “calorie off mayonnaise” generally refers to a mayonnaise-like food having an oil content of less than 65%, and as an ingredient, an emulsifier or a thickener (eg, pectin, starch, thickening polysaccharide, xanthan gum, etc.) It is known as mayonnaise-like food with added.

(Modification of embodiment)
The aspect described above shows one aspect of the present invention, and the present invention is not limited to the above-described embodiment, and has the configuration of the present invention and can achieve the objects and effects. It goes without saying that modifications and improvements within the scope are included in the content of the present invention. Further, the specific structure, shape, and the like in carrying out the present invention are not problematic as other structures, shapes, and the like as long as the objects and effects of the present invention can be achieved. The present invention is not limited to the above-described embodiments, and modifications and improvements within the scope that can achieve the object of the present invention are included in the present invention.

For example, in the above-described embodiment, as the multilayer structure of the oil-based content plastic container 1 according to the present invention, the three-layer structure illustrated in FIG. 2 and the four-layer structure illustrated in FIG. The number of layers and types of the multilayer structure is not limited to these. Therefore, if the layer (innermost layer) 2 in contact with the contents has a layer made of a resin composition in which silicone is added to a polyolefin-based resin, an arbitrary layer can be formed as necessary. Further, the adhesive resin layers 61 and 62 are not essential, and may not be formed if unnecessary.
In addition, the specific structure, shape, and the like in the implementation of the present invention may be other structures as long as the object of the present invention can be achieved.

  EXAMPLES Hereinafter, although this invention is demonstrated further in detail based on an Example and a comparative example, this invention is not limited to these.

[Example 1, Example 2 and Comparative Examples 1 to 4]
About the container of the shape shown in FIG. 1, the material which comprises each layer was shape | molded like the following Example 1, Example 2, and the comparative example 1 thru | or the comparative example 4 as the 4 layer structure shown in FIG. The molding was carried out by extruding a melt preform (parison) from a multilayer die head by coextrusion molding of the constituent resin or resin composition, and performing known direct blow molding. Among the adhesive resin layers, “adhesive resin layer 1” is an adhesive resin layer between the outermost layer and the gas barrier layer, “adhesive resin layer 2” is an adhesive resin layer between the gas barrier layer and the repro layer, Point to.

[Example 1]
Outermost layer: Low density polyethylene (LDPE) + lubricant (fatty acid amide lubricant)
Adhesive resin layer 1: maleic anhydride-modified polyethylene (maleic anhydride-modified PE)
Gas barrier layer: Ethylene-vinyl alcohol copolymer (EVOH)
Adhesive resin layer 2: maleic anhydride-modified polyethylene (maleic anhydride-modified PE)
Repro layer: Outer layer, adhesive resin layer, gas barrier layer, all material mixture constituting innermost layer (hereinafter referred to as “all material mixture” including the notation in Table 1)
Innermost layer: low density polyethylene (LDPE) + silicone

[Example 2]
Outermost layer: Polypropylene (PP) + lubricant (fatty acid amide lubricant)
Adhesive resin layer 1: maleic anhydride modified polypropylene (maleic anhydride modified PP)
Gas barrier layer: Ethylene-vinyl alcohol copolymer (EVOH)
Adhesive resin layer 2: maleic anhydride-modified polypropylene (maleic anhydride-modified PP)
Repro layer: All materials mixed Inner layer: Polypropylene (PP) + Silicone

[Comparative Example 1]
Outermost layer: Polypropylene (PP) + lubricant (fatty acid amide lubricant)
Adhesive resin layer 1: maleic anhydride modified polypropylene (maleic anhydride modified PP)
Gas barrier layer: Ethylene-vinyl alcohol copolymer (EVOH)
Adhesive resin layer 2: maleic anhydride-modified polypropylene (maleic anhydride-modified PP)
Repro layer: All materials mixed Inner layer: Polypropylene (PP) + lubricant (fatty acid amide lubricant)

[Comparative Example 2]
Outermost layer: Low density polyethylene (LDPE) + lubricant (fatty acid amide lubricant)
Adhesive resin layer 1: maleic anhydride-modified polyethylene (maleic anhydride-modified PE)
Gas barrier layer: Ethylene-vinyl alcohol copolymer (EVOH)
Adhesive resin layer 2: maleic anhydride-modified polyethylene (maleic anhydride-modified PE)
Repro layer: All materials mixed Inner layer: Low density polyethylene (LDPE) + lubricant (fatty acid amide lubricant)

[Comparative Example 3]
Outermost layer: Low density polyethylene (LDPE) + lubricant (fatty acid amide lubricant)
Adhesive resin layer 1: maleic anhydride-modified polyethylene (maleic anhydride-modified PE)
Gas barrier layer: Ethylene-vinyl alcohol copolymer (EVOH)
Adhesive resin layer 2: maleic anhydride-modified polyethylene (maleic anhydride-modified PE)
Repro layer: All materials mixed Inner layer: Low density polyethylene (LDPE)

[Comparative Example 4]
Outermost layer: Polypropylene (PP) + lubricant (fatty acid amide lubricant)
Adhesive resin layer 1: maleic anhydride modified polypropylene (maleic anhydride modified PP)
Gas barrier layer: Ethylene-vinyl alcohol copolymer (EVOH)
Adhesive resin layer 2: maleic anhydride-modified polypropylene (maleic anhydride-modified PP)
Repro layer: All materials mixed Inner layer: Polypropylene (PP)

  The silicone added to the innermost layer is organopolysiloxane, and a masterbatch (MB) in which silicone and the base resin are blended at a mass ratio of 1/1 is used. The total resin composition was 5.0% by mass (the actual silicone content was 2.5% by mass), and the remainder was polyolefin resin (low density polyethylene, polypropylene). Here, the base resin was used in common with the resin to be added (mixed), and low density polyethylene (LDPE) was used in Example 1, and polypropylene (PP) was used in Example 2. Silicone having a weight average molecular weight of 1 million (1000000) or more and a viscosity of 6 million (6000000) cS or more was used.

  The lubricant used is a fatty acid amide lubricant, and the content of oleic amide is 1000 ppm (0.1% by mass) with respect to the whole layer (resin composition), and the remainder is a polyolefin resin ( Low density polyethylene, polypropylene).

  The total thickness of the container (the thickness of the body) is 200 μm, and the thickness ratio of the outermost layer / adhesive resin layer 1 / gas barrier layer / adhesive resin layer 2 / repro layer / innermost layer is 30 in order. /1.5/3.0/1.5/54/10.

[Test Example 1]
About the obtained container, "(1) Sliding property of oily contents" was compared and evaluated according to the following contents. The results are shown in Table 1 together with the layer structure of the container.

(1) Sliding property of oily contents:
In a container (capacity: 500 g), 100 g of calorie-off mayonnaise was put as an oily content, and it was inverted once to move most of the content (mayonnaise) to the top side (side with the cap). After moving, it was returned from the inverted position to the normal position and stored in the refrigerator for 12 hours. After 12 hours, when the mass ratio is 90% or more (90 g or more) from the bottom of the container to the fifth position, “◯”, 70% or more and less than 90% (70 g or more and less than 90 g) is present. The case was “Δ” and less than 70% (less than 70 g) was “x”. In addition, “◯” was determined to be acceptable, and “Δ” and “×” were determined to be unacceptable.

(Configuration and evaluation results)

  As shown in Table 1, in Example 1 and Example 2 in which silicone was added to the innermost layer, the innermost layer had good sliding properties, and the content of calorie off mayonnaise slipped 90% or more. On the other hand, Comparative Example 1 and Comparative Example 2 in which a fatty acid amide lubricant was added to the innermost layer, Comparative Example 3 and Comparative Example 2 in which silicone was not added to the innermost layer and only a polyolefin resin (low density polyethylene, polypropylene) were used. Both were inferior to the examples.

  INDUSTRIAL APPLICABILITY The present invention can be used as a plastic container that contains an oily substance such as mayonnaise containing calorie-off mayonnaise, and has high industrial applicability.

1 ... Plastic container for oily contents 11 ... Screw thread 12 ... Outlet 13 ... Cap 14 ... Body 2 ... Innermost layer (layer in contact with the contents)
3. Gas barrier layer (intermediate layer)
4 ... Outermost layer 5 ... Repro layer 6 ... Adhesive resin layer 61,62 ... Adhesive resin layer

Claims (4)

A plastic container for oily contents for containing oily contents,
A plastic container for oily contents, wherein at least the layer in contact with the contents is made of a resin composition obtained by adding silicone to a polyolefin resin.   The plastic container for oily contents according to claim 1, wherein the silicone has a weight average molecular weight of 1,000,000 or more.   The plastic container for oily contents according to claim 1 or 2, wherein the silicone is an organopolysiloxane. The layer in contact with the contents is the innermost layer,
An outermost layer comprising a resin composition obtained by adding a lubricant to a polyolefin-based resin;
The plastic container for oily contents according to any one of claims 1 to 3, further comprising a gas barrier layer between the outermost layer and the innermost layer.

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