Packaging materials for products containing surfactants.

Abstract

DEPCT64 Packaging materials with a surface that exhibits both slippery and protective properties. Excellent adhesion to products containing surfactants, such as cosmetics and similar products, which maintains Maintaining stability over extended periods, packaging materials for products which have... The surfactants include a solid surface layer3 which contains a non-silicone polymer. Aromatic and silicone oil layers1 are cured on a solid surface layer3, where the polymer... Non-aromatic silicone types are at least one type of polymer that can be selected. A group consisting of silicone resins, silicone-modified olefin resins, and modified polysaccharides. Modified with silicone and acrylic resins modified with silicone. -----------------------------------------------------------

Description

Packaging materials for surfactant-containing products

[0001] The present invention relates to packaging materials for surfactant-containing products.

[0002] Plastic containers are widely used for various purposes because they are easy to mold, can be produced at low cost, etc. In particular, bottle-shaped olefin resin containers, the inner surface of which is made of an olefin resin such as low-density polyethylene and which are formed by direct blow molding, are suitably used as containers for storing viscous slurry or paste-like contents such as ketchup, from the viewpoint of ease of squeezing out the contents.

[0003] Furthermore, in a container for storing a viscous content, in order to quickly discharge the content or to use it up cleanly without leaving any residue on the inner surface of the container or the lid, the inner surface of the container is required to have slipperiness or non-adhesiveness to the content.In recent years, as a means for imparting the above-mentioned slipperiness or non-adhesiveness, various methods have been proposed in which a liquid layer (lubricating liquid layer) that exhibits slipperiness or non-adhesiveness to the fluid substance flowing on the substrate is provided on the surface of the substrate, but in such methods, the problem is how to stably retain the lubricating liquid without it flowing off.

[0004] For example, Patent Documents 1 and 2 propose a method of roughening the surface of a substrate to stably retain a lubricating liquid on the surface. However, this method involves blending fine particles such as silica into the resin that forms the substrate surface, and reflecting the dispersion of these fine particles on the surface, which makes it very difficult to control the degree of roughness. There are also methods for forming a rough surface by surface treatment such as blasting, but this is not only difficult to apply in the field of containers, but it is still difficult to stably control the degree of roughness.

[0005] In addition, Patent Document 3 proposes forming a substrate surface from a polymer that swells with the lubricating liquid, and absorbing the lubricating liquid into the polymer, thereby stably maintaining a lubricating liquid layer on the substrate surface. Furthermore, Patent Document 4 proposes forming a substrate surface from a porous polymer film, and absorbing the lubricating liquid into the polymer film, thereby stably maintaining a lubricating liquid layer on the substrate surface. However, these methods have the problem that the lubricating liquid penetrates or is absorbed into the substrate surface, causing the lubricating liquid layer to decrease over time. Therefore, although the substrate initially exhibits good slip properties and anti-adhesion properties, these properties gradually decrease, which is an inconvenience.

[0006] On the other hand, Patent Document 5 proposes a method in which a base film having a π-electron-containing functional group (e.g., an aromatic group) is formed on the flat surface of a substrate, and a lubricant (slip-forming agent) is retained on the base film by utilizing π interactions. This method does not retain the lubricant on the base film by penetrating or absorbing (swelling) the base film, effectively suppressing the disadvantage of the lubricant layer being worn away over time, and allowing for long-term development of slipperiness and anti-adhesion properties. However, this method retains the lubricant through π interactions caused by functional groups having π electrons, so the lubricant retained on the surface is limited to those that interact with π electrons, thereby limiting the types of lubricant. Therefore, according to research by the present inventors, there is a drawback in that silicone oil, which exhibits excellent slipperiness and anti-adhesion properties against surfactant-containing substances such as shampoos, cannot be used as a lubricant. For example, Patent Document 5 uses decyltrimethoxysilane as a lubricant, but this lubricant is unable to exhibit slipperiness and anti-adhesion properties against surfactant-containing fluids such as shampoos. This is probably because such lubricating liquid has a high affinity with surfactants, and when it comes into contact with a substance containing surfactants, it will be integrated with the substance and scraped off from the surface.Furthermore, the above-mentioned base film has a π-electron-containing functional group, which increases the surface tension, and may promote the adhesion of the packaged product.In addition, since the base film is formed on the substrate surface by applying a coating solution containing a compound having a π-electron-containing functional group (e.g., phenylethoxysilane) and forming it on the substrate surface through a coupling reaction with the substrate surface, the base film treatment is extremely complicated, for example, in order to remove unreacted compounds, a cleaning process using an organic solvent is required after the base film is formed, which is difficult to implement industrially from the standpoint of cost and manufacturing equipment.

[0007] Japanese Patent No. 5971337 Japanese Patent No. 6228012 JP 2015-531005 JP 2016-11375 JP 2017-94661

[0008] Therefore, an object of the present invention is to provide a packaging material having a surface that can stably exhibit excellent slip properties and anti-adhesion properties for a long period of time for surfactant-containing products, such as cosmetics, etc. Another object of the present invention is to provide a packaging material for surfactant-containing products, on which a surface that exhibits the above-mentioned slip properties and anti-adhesion properties can be easily formed by ordinary application and drying without requiring any special reaction.

[0009] According to the present invention, there is provided a packaging material for surfactant-containing products, which comprises a surface solid layer containing a non-aromatic silicone polymer and a silicone oil layer held on the surface solid layer, wherein the non-aromatic silicone polymer is at least one selected from the group consisting of silicone resins, silicone-modified olefin resins, silicone-modified polysaccharides, and silicone-modified acrylic resins.

[0010] In the packaging material of the present invention, (1) the non-aromatic silicone polymer is represented by the following formula (1): R ２ SiO ２／２ (1) The solid layer contains a D unit represented by the formula: wherein R is a non-aromatic group, particularly an alkyl group; (2) the surface free energy of the solid layer is 35 mJ / m ２ (3) the root mean square roughness Sq of the solid layer is 0.3 μm or less; (4) the solid layer has an average transmittance of 80% or more for light having a wavelength of 400 to 800 nm; (5) the solid layer is formed on the surface of a plastic substrate, a glass substrate, a metal substrate, or a paper substrate; (6) the solid layer has the shape of a container; (7) the surfactant-containing product is a fluid; and (8) the surfactant-containing product is a cosmetic.

[0011] The packaging material of the present invention is used for applications in which various products containing surfactants, such as fluids including cosmetics typified by shampoos and conditioners, are contained. Because the packaging material exhibits excellent anti-adhesion and slip properties for such surfactant-containing products, these products can be consumed without being left behind in the packaging material and without waste.

[0012] Furthermore, in the packaging material of the present invention, the surface solid layer that serves as the base for the silicone oil layer that exhibits the above-mentioned properties against surfactants can be formed by simple coating, and the surface solid layer can be formed without any special reaction between the silicone oil or the substrate surface that supports this solid layer, which is extremely advantageous from an industrial perspective.

[0013] Furthermore, the surface solid layer contains a specific non-aromatic silicone polymer, and is designed to retain silicone oil by surface adsorption due to intermolecular forces. That is, the silicone oil is not retained by forming irregularities on the surface solid layer, nor is the surface solid layer porous and absorbs the silicone oil to retain it on the surface. Therefore, the silicone oil can be retained stably and evenly without any variation, and without any loss due to absorption, and the above-mentioned anti-adhesion and slip properties can be exhibited stably and evenly. Furthermore, since there is no need to form irregularities on the surface of the surface solid layer, and a mirror finish is sufficient, high transparency can be ensured, which is an extremely advantageous feature as a packaging material.

[0014] FIG. 2 is a side cross-sectional view showing the surface configuration of the packaging material of the present invention.

[0015] The packaging material of the present invention is applied to surfactant-containing products, and as shown in Figure 1, has a silicone oil layer 1 on its surface, and this silicone oil layer 1 is held on the surface of a surface solid layer 3, and the surface solid layer 3 is provided on the surface of a predetermined substrate 5. That is, in the packaging material of the present invention, the surfactant-containing product is packaged so as to come into contact with the silicone oil layer 1.

[0016] <Silicone Oil Layer 1> In the packaging material of the present invention, a silicone oil layer 1 is provided on the surface that comes into contact with the packaged product, and therefore excellent adhesion prevention and slipperiness are exhibited for surfactant-containing products. Such silicone oils have a kinematic viscosity of 2 to 1000 mm at 25°C, for example. ２ / s range, and it is stably present on the surface solid layer 3 without being scraped off by the surfactant present in the packaged product, and it also exhibits excellent anti-adhesion and slippage properties against surfactant-containing products. For example, if the viscosity of this silicone oil is smaller than the above range, the silicone oil layer 1 tends to easily fall off from the surface solid layer 3, and the anti-adhesion and slippage properties tend to become unstable. On the other hand, if the viscosity of the silicone oil is larger than the above range, the fluidity of the silicone oil is low, it becomes in a state close to a solid, and the slippage properties against surfactant-containing products are reduced.

[0017] Silicone oils having the above viscosity are obtained, for example, by polycondensation of dialkoxysilane and trialkoxysilane, and are represented by the following formula: (RO) ３ Si-(R ２ SiO)n-Si(OR) ３ In the formula, R is an alkyl group, for example, a lower alkyl group having 4 or less carbon atoms such as a methyl group, an ethyl group, a propyl group, or a butyl group, and n is the number of SiO chains that will achieve the aforementioned viscosity. In the present invention, dimethyl silicone oil (where R in the above formula is a methyl group) is particularly preferred because it is the cheapest and most easily available.

[0018] In the present invention, the silicone oil layer 1 has a density of, for example, 0.1 to 80 g / m from the viewpoint of stably retaining the silicone oil and stably exhibiting the above-mentioned properties. ２ , especially 0.5 to 50 g / m ２ It is preferable that the silicone oil is formed in an amount of 100 to 2000. In addition, the silicone oil may be the same component as that contained in the surfactant product, and the silicone oil layer may be formed from the component contained in the surfactant-containing product.

[0019] <Surface solid layer 3> In the present invention, the surface solid layer 3 comprises a non-aromatic silicone polymer. That is, this silicone polymer has SiO bond, but must not contain at least aromatic group. The silicone polymer with aromatic group has poor affinity with the above-mentioned silicone oil, and does not exert sufficient intermolecular force between it and silicone oil, so it cannot stably maintain the silicone oil layer 1. In addition, since it has aromatic group, the surface tension increases, so the packaged product is easily adhered, and for example, even if it shows excellent slip property and anti-adhesion property in the initial state, these properties will disappear in a short period of time.

[0020] The silicone polymer is a polymer having M units, D units, T units, and Q units as basic structural units. The M units are monofunctional units represented by the formula: R ３ SiO １／２ The D unit is a bifunctional unit represented by the formula: R ２ SiO ２ The above T unit is a trifunctional unit represented by the formula: RSiO ３／２ The Q unit is a tetrafunctional unit represented by the formula: SiO ４／２ It is represented by the formula: R in the above formula is usually an organic group, but since the silicone polymer used in the present invention does not have an aromatic group, the above R is an organic group that does not have an aromatic ring, and as long as it does not have an aromatic ring, it may be a reactive group such as a (meth)acrylic group, an epoxy group, or an isocyanate group, but most are alkyl groups typified by a methyl group, particularly alkyl groups having 4 or less carbon atoms. Furthermore, as long as the properties of the silicone polymer are not significantly impaired, part of R may be a hydrogen atom. For example, the above-mentioned silicone oil is also a polymer that belongs to the above-mentioned silicone polymer and has a linear structure in which T units are bonded to the end of the chain of D units, but this polymer is an oil (liquid), has a low degree of polymerization, and does not form a surface solid layer 3.

[0021] In the present invention, the non-aromatic silicone polymer that forms the surface solid layer 3 is a silicone resin, a silicone-modified olefin resin, a silicone-modified polysaccharide, or a silicone-modified acrylic resin, provided that it does not have an aromatic group.

[0022] Silicone resins are composed of any of the above-mentioned M units, D units, T units, and Q units. For example, a solid polymer containing a large amount of Q units as its basic structure and having a structure in which M units are terminated is sometimes called an MQ resin. Those based on T units are called MT resins, which are also called silsesquioxane oxanes, and include those with a random structure in which T units are randomly bonded, a ladder structure in which T units are linked in a ladder-like structure, and even a cage structure in which T units are linked in a cage-like structure. Those primarily composed of D units and T units are called DT resins (or MDT resins), and those with a structure in which linear dialkylpolysiloxanes are crosslinked with a polyfunctional silane compound are called silicone rubbers.

[0023] Silicone-modified olefin resins are those in which a silicone bond is introduced into an olefin resin by reacting a non-aromatic silicone oligomer having a reactive group such as a (meth)acrylic group or a silane coupling agent with the olefin resin. In particular, silicone-modified polynorbornene in which a silicone bond is introduced into polynorbornene is commercially available from Shin-Etsu Silicones Co., Ltd. under the trade name NBN-30-ID. Silicone-modified polypropylene and silicone-modified polyethylene in which a silicone bond is introduced into polypropylene or polyethylene are commercially available from Dow Corning Toray Co., Ltd. under trade names such as BY27-201, BY27-201C, BY27-202H, and BY27-213.

[0024] Silicone-modified polysaccharides are polysaccharides in which monosaccharide molecular units are linked by glycosidic bonds, and silicone bonds are introduced by reacting some of the OH groups contained in the molecular chain with a silicone oligomer or a silane coupling agent having a reactive group such as a (meth)acrylic group, an epoxy group, or an isocyanate group. For example, such silicone-modified polysaccharides are commercially available from Shin-Etsu Silicones Co., Ltd. under the trade name Silicone-modified Pullulan TPSL-30-ID.

[0025] Silicone-modified acrylic resins are obtained by copolymerizing an acrylic silicone polymer, in which a (meth)acrylic group is bonded to the end of the silicone chain, with an acrylic resin.

[0026] In the present invention, the non-aromatic silicone polymer described above has a D unit, i.e., a unit represented by the formula: R ２ SiO ２ It is more preferable that the silicone oil has a bifunctional unit represented by the formula: R (where R is a non-aromatic organic group, especially an alkyl group). This increases the intermolecular contact area with the silicone oil composed of D units, and a stronger intermolecular force acts, so that the silicone oil can be more stably held. For example, the silicone-modified acrylic resin is prepared by copolymerizing an acrylic silicone polymer containing the above-mentioned D units, that is, a bifunctional unit represented by the formula: R ２ SiO ２ (R is a non-aromatic organic group, particularly an alkyl group), the use of a linear polymer having a bifunctional unit represented by the formula (R) can further enhance the anti-adhesion properties and slip properties. Note that such a surface solid layer 3 may contain small amounts of other resins, such as aromatic silicone resins or other thermoplastic resins, as long as the excellent properties of the non-aromatic silicone polymer described above are not impaired.

[0027] In the present invention, the surface solid layer 3 is formed from the non-aromatic silicone polymer described above, and by applying silicone oil thereon, the silicone oil is prevented from falling off, the silicone oil layer 1 is stably maintained, and the silicone oil can exhibit excellent anti-adhesion properties and slip properties for surfactant-containing products over a long period of time.

[0028] The surface solid layer 3 formed from the non-aromatic silicone polymer has a surface free energy of 35 mJ / m ２ It is desirable to select this non-aromatic silicone polymer so that the silicone oil wets and spreads over the entire surface of the surface solid layer 3, making it possible to achieve a uniform thickness across the entire silicone oil layer 1. Generally, the surface free energy tends to be lower the more Si-rich the silicone oil is, and this can be utilized to select the non-aromatic silicone polymer to be used.

[0029] Furthermore, the surface solid layer 3 of the present invention does not retain the silicone oil layer 1 by the penetration or swelling of the silicone oil, but rather by the intermolecular forces with the silicone oil. Therefore, the surface solid layer 3 does not need to be porous, nor does it need to be roughened by forming irregularities on its surface. Therefore, the surface solid layer 3 has a smooth surface with a root-mean-square roughness Sq (in accordance with ISO 25178) of 0.3 μm or less. Furthermore, due to this smooth surface, the surface solid layer 3 exhibits high transmittance to visible light, for example, an average transmittance of 80% or more for light with wavelengths of 400 to 800 nm, demonstrating high transparency.

[0030] In the present invention, such a surface solid layer 3 can be easily formed by coating the surface of the substrate 5 with a coating solution prepared by dissolving the non-aromatic silicone polymer in an alcohol-based solvent such as isopropanol, an ester-based solvent such as butyl acetate, or a siloxane-based solvent such as a low-molecular-weight, volatile polysiloxane, followed by drying. In other words, the surface solid layer 3 exhibits high adhesion to the surface of the substrate 5 due to the presence of silicone groups, and can therefore be easily formed by simple coating. For example, because the surface solid layer 3 does not chemically react with the surface of the substrate 5, no steps such as cleaning to remove unreacted material are required after film formation. The coating solution can be applied by any suitable method, such as spraying, brush coating, dipping, or roll coating, depending on the shape of the substrate 5. The surface solid layer 3 can also be formed by methods such as the T-die method, calendaring, or inflation method. Furthermore, a multilayer structure having the surface solid layer 3 and the substrate 5 can be formed by methods such as melt coextrusion and dry lamination.

[0031] The surface solid layer 3 formed in this manner does not retain the silicone oil layer 1 by swelling or penetration of the silicone oil or by surface irregularities (roughening), so its thickness may be as thin as possible, for example, 10 μm or less, and particularly 0.1 to 5 μm.

[0032] <Substrate 5, Shape of Packaging Material> The substrate 5 on which the above-mentioned surface solid layer 3 is formed may be a plastic substrate, a glass substrate, a metal substrate, or a paper substrate depending on the shape of the packaging material, and may be formed from any material suitable for the shape of the packaging material. For example, the shape of the packaging material may be a so-called container, a wrapping film, a lid material, etc., but since the packaging material of the present invention is applied to surfactant-containing products, it is particularly optimal that it has the shape of a container.

[0033] As the container, a bottle or a pouch is most common, and therefore the material of the substrate 5 is preferably a plastic, particularly a polyolefin or a polyester, and these substrates 5 may have a multilayer structure in which a gas barrier resin layer such as an ethylene-vinyl alcohol copolymer layer is provided as an intermediate layer.

[0034] In the present invention, surfactant-containing products are used as the packaged products, and the packaging material exhibits excellent anti-adhesion and slip properties for such surfactant-containing products. Such surfactant-containing products are not particularly limited as long as they contain a surfactant, but are particularly suitable for fluid cosmetics, particularly highly viscous cosmetics, such as shampoo, body soap, hand soap, facial cleanser, hair styling products, shaving products, lotions, beauty serums, and conditioners. In particular, the packaging material of the present invention is most suitably used as a refill pouch containing shampoo or conditioner.

[0035] The present invention will be described in the following examples. In the following examples, the silicone oil used is dimethyl silicone oil (kinematic viscosity at 25° C.: 20 mm ２ The various properties tested in the following examples were evaluated by the following methods.

[0036] [Measurement of surface free energy of surface solid layer] In a packaging material (film) produced by the method described below, the surface free energy of the solid layer before applying dimethyl silicone oil was measured. ２ O) and diiodomethane (CH ２ I ２ The contact angle of the solid layer was measured using an automatic contact angle meter (DropMaster 700 manufactured by Kyowa Interface Science Co., Ltd.). From the contact angle data thus measured, the surface free energy of the solid layer was calculated using software (analysis software: FAMAS, analysis theory name: Owens-Wendt) attached to the contact angle meter. For those not forming a solid layer, the surface free energy of the substrate was measured in the same manner.

[0037] [Surface Roughness Measurement] For packaging materials prepared using the method described below, the surface shape of the solid layer before applying dimethyl silicone oil was measured using a laser microscope (Keyence Corporation, VK-X260). A 50x objective lens was used for the measurement. From the obtained three-dimensional shape data, the root mean square roughness (Sq) over a 100 μm x 100 μm area was calculated using software attached to the laser microscope (Keyence Corporation, Multi-File Analysis Application VK-H1XM). Sq was calculated in accordance with ISO 25178. For those without a solid layer, Sq was measured similarly for the surface of the substrate.

[0038] [Measurement of visible light transmittance] For the packaging material produced by the method described below, the average transmittance (%) of light at wavelengths of 400 to 800 nm was measured for the solid layer on the substrate before applying the dimethyl silicone oil using a spectrophotometer (Shimadzu Corporation, UV-3100PC).

[0039] [Anti-adhesion] The film of the packaging material was fixed to a sample stage tilted at 60 degrees, and 0.1 g of shampoo (Pantene Extra Damage Care Shampoo, manufactured by P&G) was repeatedly dropped onto the same spot from a position approximately 1 cm away from the surface of the silicone oil layer. The number of times that shampoo began to remain at the drop position was counted, and the anti-adhesion and slipperiness were evaluated based on this number.

[0040] [Sliding property] The packaging film was fixed to a horizontal sample stage, and 0.1 g of the shampoo used above was dropped from a position about 1 cm away from the surface of the silicone oil layer. After 1 minute, the sample stage was gradually tilted, and the sliding property was evaluated based on the angle at which the sample slid down.

[0041] Example 1 An unstretched polypropylene film (RXC-22 manufactured by Mitsui Chemicals Tocello, Inc., thickness 50 μm, hereinafter abbreviated as "CPP") was prepared as a substrate. A non-aromatic silicone polymer (acrylic silicone KP-543 manufactured by Shin-Etsu Chemical Co., Ltd., containing butyl acetate as a solvent) was applied onto this substrate using a bar coater, and the polymer was dried in a vacuum dryer at 80°C for 10 minutes to form a solid layer with a thickness of 2.0 μm. Next, dimethyl silicone oil was applied onto the acrylic silicone using a bar coater, with a coating amount of 10 g / m. ２ The silicone oil layer was formed to prepare a packaging material. The results of various measurements on this packaging material were as follows:

[0042] Solid layer surface free energy: 29.7 mJ / m ２ Root mean square roughness Sq: 0.006 μm Visible light transmittance: 90.2% Anti-adhesion: shampoo; 100 times< Slippage: shampoo; 10 times

[0043] Example 2 A packaging material was prepared in the same manner as in Example 1, except that silicone-modified polynorbornene NBN-30-ID manufactured by Shin-Etsu Chemical Co., Ltd. was used as the non-aromatic silicone polymer, and various measurements were carried out. The results were as follows: Solid layer surface free energy: 27.8 mJ / m ２ Root mean square roughness Sq: 0.005 μm Visible light transmittance: 92.0% Anti-adhesion: Shampoo; 34 times Slippage: Shampoo; 11 times

[0044] Example 3 A packaging material was prepared and various measurements were carried out in the same manner as in Example 1, except that silicone-modified pullulan TSPL-30-ID manufactured by Shin-Etsu Chemical Co., Ltd. was used as the non-aromatic silicone polymer. The results were as follows: Solid layer surface free energy: 23.8 mJ / m ２ Root mean square roughness Sq: 0.008 μm Visible light transmittance: 92.0% Anti-adhesion: Shampoo; 18 times Slippage: Shampoo; 13 times

[0045] Example 4 A packaging material was prepared in the same manner as in Example 1, except that methyl silicone resin KR-251 manufactured by Shin-Etsu Chemical Co., Ltd. was used as the non-aromatic silicone polymer and a surface solid layer was formed on a glass plate (S-2215 manufactured by Matsunami Glass Co., Ltd., thickness 1000 μm) using this polymer, and various measurements were carried out. The results were as follows: Solid layer surface free energy: 24.6 mJ / m ２ Root mean square roughness Sq: 0.008 μm Visible light transmittance: 92.7% Anti-adhesion: Shampoo; 29 times Slippage: Shampoo; 12 times

[0046] Comparative Example 1 A packaging material was prepared in the same manner as in Example 5, except that methylphenyl silicone resin KR-255 (aromatic silicone polymer) manufactured by Shin-Etsu Chemical Co., Ltd. was used as the silicone polymer, and various measurements were carried out. The results were as follows: Solid layer surface free energy: 35.2 mJ / m ２ Root mean square roughness Sq: 0.006 μm Visible light transmittance: 95.6% Anti-adhesion: Shampoo; 8 times Slippage: Shampoo; not measurable (drooped with a trail and continued to adhere even when turned at a 90-degree angle)

[0047] <Comparative Example 2> Dimethyl silicone oil was applied to a CPP substrate without forming a surface solid layer, and various measurements were carried out. The results were as follows: Surface free energy: 33.7 mJ / m ２ Root mean square roughness Sq: 0.173 μm Visible light transmittance: 60.1% Anti-adhesion: Shampoo; 3 times Slippage: Shampoo; not measurable (drooped with a trail and continued to adhere even when turned at a 90-degree angle)

[0048] <Comparative Example 3> Various measurements were carried out in the same manner as in Comparative Example 3, except that a low-density polyethylene film (F120N manufactured by Ube Maruzen Polyethylene Co., Ltd., thickness 40 μm) was used as the substrate. The results were as follows: Surface free energy: 35.7 mJ / m ２Root mean square roughness Sq: 0.049 μm Visible light transmittance: 83.9% Anti-adhesion: Shampoo; 6 times Slippage: Shampoo; not measurable (drooped with a trail and continued to adhere even when turned at a 90-degree angle)

[0049] Comparative Example 4 Various measurements were carried out in the same manner as in Comparative Example 3, except that a polyethylene terephthalate film (P-60 manufactured by Toray Industries, Inc., thickness 12 μm) was used as the substrate. The results were as follows: Surface free energy: 50.9 mJ / m ２ Root mean square roughness Sq: 0.050 μm Visible light transmittance: 86.5% Anti-adhesion: Shampoo; 5 times Slippage: Shampoo; not measurable (drooped with a trail and continued to adhere even when turned at a 90-degree angle)

[0050] Comparative Example 5: Various measurements were carried out in the same manner as in Comparative Example 3, except that an ethylene vinyl alcohol film (EF-F manufactured by Kuraray Co., Ltd., thickness 12 μm) was used as the substrate. The results were as follows: Surface free energy: 44.2 mJ / m ２ Root mean square roughness Sq: 0.086 μm Visible light transmittance: 89.5% Anti-adhesion: Shampoo; 3 times Slippage: Shampoo; not measurable (drooped with a trail and continued to adhere even when turned at a 90-degree angle)

[0051] Comparative Example 6 Various measurements were carried out in the same manner as in Comparative Example 3, except that a glass plate (S-2215 manufactured by Matsunami Glass Co., Ltd., thickness 1000 μm) was used as the substrate. The results were as follows: Surface free energy: 72.0 mJ / m ２ Root mean square roughness Sq: 0.018 μm Visible light transmittance: 91.3% Anti-adhesion: Shampoo; 3 times Slippage: Shampoo; not measurable (drooped with a trail and continued to adhere even when turned at a 90-degree angle)

[0052] 1: Silicone oil layer 3: Surface solid layer 5: Substrate

Claims

DEPCT641. Packaging material for surfactant products consisting of a solid substrate layer containing a non-aromatic silicone polymer and a silicone oil layer maintained on such solid substrate layer, which is characterized as follows: such non-aromatic silicone polymer is at least one of the selected polymers from the group of silicone resins, silicone-modified olefin resins, silicone-modified polysaccharides and silicone-modified acrylic resins.

2. Packaging material for surfactant products according to claim 1, in which such non-aromatic silicone polymer includes the unit-D denoted by the following formula (1): R2SiO2 / 2 (1), where R is the non-aromatic group and, specifically, the alkyl group.

3. Packaging material for surfactant products according to claim 1, in which such solid layer has a surface free energy of no more than 35 mJ / m².4.Packaging materials for products containing surfactants under claim 1, where such solid layer has a square root of the mean square roughness Sq not more than 0.3 micrometers; 5. Packaging materials for products containing surfactants under claim 1, where such solid layer has an average light transmittance of not less than 80% across the wavelength range of 400 to 800 nanometers; 6. Packaging materials for products containing surfactants under claim 1, where such solid layer is formed on the surface of a plastic base material, a glass base material, a metal base material, or a paper base material; 7. Packaging materials for products containing surfactants under claim 1, where such packaging material is in the form of a container; 8. Packaging materials for products containing surfactants under claim 1, where the product containing such surfactant is a fluid; 9.Packaging materials for products containing surfactants under claim number 8, where such products containing surfactants are cosmetics.