JP3357306B2 - Container selection method and products according to the selection method - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method of selecting an appropriate plastic container when filling a plastic container with cosmetics, and a product obtained by the method.

[0002]

2. Description of the Related Art Plastic containers are advantageous in that they are easy to handle because they are lightweight and durable, and that they have excellent sealing properties, and are used for packaging in various fields such as cosmetics, foods and pharmaceuticals. Used as a container.

[0003]

However, plastic containers generally have the property of transmitting and adsorbing water, oxygen, carbon dioxide, organic compounds and light. Therefore, when commercializing the product, carefully consider the relationship and compatibility between the contents and the plastic container in order to prevent deterioration of the contents to be filled inside and cracks in the plastic container caused by the contents. There is a need to.

On the other hand, in the field of cosmetics, the types of substances used as raw materials are increasing year by year. Among them, silicone oil has been applied to cosmetics since about 15 years ago, and its molecular design is easy and compounds in various forms can be obtained. The types of silicone derivatives that can be produced tend to increase. In particular, polyether-modified silicone, one of the silicone derivatives,
It has come to be incorporated into cosmetics as a surfactant or a functional finish. However, when a cosmetic containing polyether-modified silicone is filled in a plastic container,
In rare cases, it was found that the plastic container dents and deforms over time. However, it is not easy to check whether or not the plastic container has changed with time.
Alternatively, it has been necessary to conduct a long-term test for each substance contained in the contents.

SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned circumstances, and has been made in consideration of the problems described above, which do not cause a problem of temporal deformation when filling a cosmetic containing a polyether-modified silicone into a plastic container. It is an object of the present invention to provide a container selecting method capable of reliably and easily selecting a suitable plastic container and a product by the selecting method.

[0006]

[0007]

Means for Solving the Problems In order to achieve the above object, the method for selecting a container according to the present invention has the following configuration. That is, a container selecting method characterized in that when filling a cosmetic containing a polyether-modified silicone into a plastic container, a container having a squeeze strength of 3.0 kg or more of the plastic container is selected.

The product of the present invention is a product obtained by filling a plastic container selected by the above-described container selection method with a cosmetic containing polyether-modified silicone.

[0009]

BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, an embodiment of a container selecting method of the present invention will be described in detail. The plastic container in the present invention is a container formed of plastic and having various shapes, and can be hermetically sealed with a cap or the like while being filled with a cosmetic.

The resin that can be used as a material for the plastic container in the present invention includes high-density polyethylene, low-density polyethylene, polypropylene, polyvinyl chloride, polyethylene terephthalate, polystyrene, polycarbonate, high nitrile resin, polyamide,
Examples thereof include saponified ethylene / vinyl acetate copolymer, polyvinylidene chloride, and the like, but are not necessarily limited thereto. Also, these resins are
They may be used alone or may be combined into a laminated container.

The polyether-modified silicone compounded in the cosmetic of the present invention is obtained by substituting a part of the methyl group of methylpolysiloxane with a polyoxyalkylene group. BY-008 [manufactured by Toray Dow Corning Co., Ltd.], T
805 sol [manufactured by Teika Co., Ltd.], but are not necessarily limited thereto.

[0012] When the content of the polyether-modified silicone in the cosmetic is in the range of 0.5 to 50% by weight, the effects of the present invention can be more remarkably obtained.

In the present invention, when the cosmetic contains a volatile component other than the polyether-modified silicone, for example, a volatile silicone such as cyclic dimethylpolysiloxane, the volatile silicone is contained in the plastic container. In order to prevent volatilization from occurring, it is preferable to provide a saponified ethylene / vinyl acetate copolymer (for example, EVAL [produced by Kuraray Co., Ltd.]) or the like as a gas barrier layer in the intermediate layer of the container wall layer. In addition, the cosmetics in the present invention include not only general cosmetics but also bath additives and the like. The dosage form can be appropriately selected from, for example, lotions, emulsions, creams, packs, powders, granules, and the like.

The present invention relates to a method for selecting a container based on the squeeze strength of a plastic container when filling a plastic container with a cosmetic compounded with polyether-modified silicone. For example, a 10 kg push-pull gauge is used as a container, and at a room temperature of 21 ° C., the center of the wall of the empty plastic container which is most squeezable at a compression part diameter of 15 mm and a pressing speed of 200 mm / min is 5 mm vertically inward. It is indicated by the resistance force when pressed. The squeeze strength is 3 . By selecting a plastic container weighing 0 kg or more, it is possible to completely eliminate the problem of temporal deformation such as dents when filling a cosmetic containing polyether-modified silicone therein.

[0015]

The present invention will now be described in detail with reference to Examples, but it should not be construed that the invention is limited thereto.

1. Samples Samples 1 to 4 shown in Table 1 have an elliptical cylindrical body (35 mm in upper major axis diameter, 27 mm in lower major axis diameter, 26 mm in upper minor axis diameter of the torso).
mm, bottom short axis diameter 23 mm, trunk height 63 mm, wall thickness 0.6-0.9 mm, average internal volume 38.5 ml). Sample 5 had an elliptical cylindrical body (36.924 mm in diameter of the upper major axis of the body and a major axis diameter of 2 in the bottom).
8.799 mm, top short axis diameter 25.077 mm, bottom short axis diameter 20.029 mm, body height 59.7 mm, wall thickness 0.9 to 1.2 mm, average internal volume 36.0 ml). . Further, in Sample 6, the body was elliptical cylindrical (the upper major axis diameter of the body was 36.8 mm and the lower major axis diameter was 29.
296mm, top short axis diameter 25.5mm, bottom short axis diameter 2
4.329mm, body height 62.5mm, wall thickness 0.8 ~
1.0 mm, average content 38.5 ml).

2. Squeeze strength measurement The squeeze strength of each of the plastic containers of Samples 1 to 6 was measured by the method described above (measurement site: central portion of the trunk in the long axis direction). Table 1 shows the results.

[0018]

[Table 1]

(However, PE is high density polyethylene, PP
Is polypropylene, EVOH is saponified ethylene-vinyl acetate copolymer, N is resin without pigment added, W is resin with white pigment added, G is resin with gray pigment added Is shown. )

In Samples 1 to 4, the squeeze strength at the center of the body of the plastic container in the longitudinal direction was changed by changing the type of resin to be compounded. Sample 5
In and 6, the squeeze strength at the center of the plastic container in the long axis direction was changed by changing the type of resin to be combined and / or the shape of the plastic container.

3. Contents Filling Each of the plastic containers of Samples 1 to 6 was filled with T805 sol (manufactured by Teika Co., Ltd.) as contents and sealed with a cap. This T805 sol is a raw material containing volatile silicone and polyether-modified silicone.

4. Time-dependent deformation rate calculation The time-dependent deformation rate (= the number of dent deformations) when the plastic containers of Samples 1 to 6 filled with the contents and sealed with a cap as described above were allowed to stand at 60 ° C. for 1 week. / Total number) was calculated. Table 2 shows the results.

[0023]

[Table 2]

From the results shown in Table 2, it is understood that there is a correlation between the squeeze strength and the temporal deformation rate. That is, the higher the squeeze strength, the lower the temporal deformation rate. Therefore, by selecting the plastic container using the squeeze strength as an index, it is possible to reliably and easily select an appropriate container in consideration of the temporal deformation rate. In this example, it is clear that by selecting a plastic container having a squeeze strength of 3.0 kg or more, it is possible to obtain a high-quality product free from the problem of dent deformation over time.

When the cosmetic containing 20% by weight of the T805 sol (manufactured by Teika Co., Ltd.) was filled into the plastic container of Sample 2, dent deformation occurred with time. When filled in a container, no dent deformation over time occurred. From this, it is clear that by using the plastic container selected by the container selection method of the present invention, it is possible to obtain a product in which the problem of the dent change with time is eliminated.

When the same test as above was performed using only volatile silicone instead of T805 sol (manufactured by Teika Co., Ltd.) containing volatile silicone and polyether-modified silicone, the plastic container was over time. No problem of dent deformation occurred.

[0027]

As described above, according to the container selecting method of the present invention, when filling a cosmetic into a plastic container, an appropriate plastic container free from the problem of temporal deformation is reliably and easily selected. It becomes possible. Therefore, without performing complicated time-lapse tests and the like as in the past,
It is possible to efficiently select the appropriate plastic container and thus definitely provide a high quality product.

Claims (2)

(57) [Claims] 1. A container selecting method, wherein a plastic container having a squeeze strength of 3.0 kg or more is selected when filling a cosmetic containing a polyether-modified silicone into a plastic container. 2. A product obtained by filling a plastic container selected by the container selection method according to claim 1 with a cosmetic containing polyether-modified silicone.