JP2009000868A - Method of manufacturing container for cosmetic and container for cosmetic - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an inexpensive small bottle having good pearl gloss, without the use of a pearl pigment or a multi-layer structure or the formation of a preform. <P>SOLUTION: A method of manufacturing a container for cosmetics comprises forming a mixed pellet by mixing a pellet (A) of a styrene-butadiene copolymer and a pellet (B) of an opalescent olefinic resin, e.g. polypropylene or low-density polyethylene, thoroughly in a mixing ratio of pellet (A): pellet (B) of 55:45 to 90:10, charging the mixed pellet into a screw-type extrusion molding machine for direct blow molding to heat, melt and knead, discharging a single-layer tubular parison, closing the molding for blow molding so as to pinch off the lower edge of the parison and carrying out direct blowing in a blowing ratio of 2-3. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a cosmetic container, and more particularly to a technique suitable for manufacturing a cosmetic small bottle having a pearl luster and a capacity of 20 ml or less.

  Conventionally, bottles with pearl luster have been mainly post-processed by painting or vapor deposition, but in recent years, pearl pigments have been added to the outermost layer of a two-layer bottle (Patent Document 1) or three layers. A blow molded bottle having a multilayer structure in which pearl essence is contained in an intermediate layer of a structured bottle has been proposed (Patent Document 2).

  Further, the outermost layer is a composition in which 70 to 96.5% by weight of a polyester resin is added with 3.5 to 30% by weight of a methacrylic resin, and the intermediate layer is an opaque white or colored thermoplastic resin layer. A blow molded bottle having a structure has also been proposed (Patent Document 3).

In addition, a preform formed by injection molding of a composition containing a thermoplastic polyester and a saponified olefin / vinyl acetate copolymer in a specified range is bottled by biaxial stretch blow to create a pearly luster. There is also a proposal that it is possible to form a bottle having the following (Patent Document 4).
Japanese Patent Laid-Open No. 9-77039 Japanese Patent No. 3014061 JP-A-6-210708 Japanese Patent Publication No. 7-340

  The methods of Patent Documents 1 and 2 have a drawback that expensive pearl pigments must be used. Moreover, since the method of patent documents 1-3 is multilayer blow molding, and patent document 4 is biaxial stretch blow molding, it is not suitable for manufacture of the small bottles for cosmetics, such as a mascara and a lip gloss.

  Then, an object of this invention is to provide the container for cosmetics which has a pearl luster without using a pearl pigment.

The method for producing a cosmetic container of the present invention made to achieve the above object,
(1) Styrene butadiene copolymer pellets and styrene butadiene copolymer and milky white olefin synthetic resin pellets having the same physical property value as the melting temperature are mixed at a weight ratio of 10% or more. Preparing mixed pellets mixed within the range of the mixing ratio in which the styrene-butadiene copolymer is rich,
(2) The mixed pellet is put into a screw-type extruder for direct blow molding, heated, melted and kneaded, and then discharged as a tube-shaped parison having a further structure from the discharge port,
(3) Close the blow mold so that the lower end of the parison is pinched off,
(4) It is characterized in that the film is stretched in a cavity of the mold under a blow ratio of 3 or less.

  Further, a cosmetic container that achieves the object of the present invention includes a styrene butadiene copolymer, and a milk white olefin synthetic resin having a physical property value similar to that of a styrene butadiene copolymer and a melting temperature, the mixing ratio of the milk white olefin synthetic resin. Is a cosmetic container having a one-layer structure in which a raw material melt-kneaded within a range of a mixing ratio in which the weight ratio is 10% or more and the styrene-butadiene copolymer is rich is stretched uniaxially by direct blow.

  Here, as the “milky white olefin-based synthetic resin having a physical property value similar to that of the styrene-butadiene copolymer”, polypropylene, low-density polyethylene, or the like may be used. By using the milky white olefin synthetic resin, it is finished in a white pearl tone without adding a white pigment. In addition, by adding pigments such as red and blue, pearl-like bottles such as pink and blue can be obtained.

  The pellets of styrene butadiene copolymer and the pellets of milky white olefin-based synthetic resin are easy to mix if they are approximately the same size.

  In the method of the present invention, it is not necessary to melt the pellets of each material into mixed material pellets, and they can be directly put into a screw type extrusion molding machine for direct blow molding and heated, melted and kneaded. Therefore, it is only necessary to prepare pellets of styrene butadiene copolymer and pellets of milky white olefin-based synthetic resin and put them into an extruder so as to be within the above-mentioned blending ratio range. At this time, the closer the mixing ratio of the olefin-based synthetic resin is to 10% by weight, the pearly luster can be enhanced. Conversely, the closer the mixing ratio of the olefin-based synthetic resin is to 50% by weight, the more pearly luster can be achieved.

  In addition, pearl luster has a difference in preference depending on age and gender with respect to the balance between brightness and calmness. However, in the range of styrene butadiene copolymer: milk white olefin-based synthetic resin = 55: 45 to 90:10, it is possible to manufacture a bottle having a pearly luster that is favorably used according to the age and sex of the consumer. it can. As long as it is in the range of styrene butadiene copolymer: milk white olefin-based synthetic resin = 60: 40 to 80:20 (more desirably, 70:30 to 80:20), men and women of any age group can obtain pearl luster. The value can be found sufficiently.

  In the case of a material in which a white pigment is mixed with 100% of a styrene butadiene copolymer, a white glossy bottle is obtained, and the pearly luster cannot be obtained. On the other hand, pearl luster is not obtained even when the milky white olefin synthetic resin is 100%.

  Therefore, a specific configuration of a cosmetic container that achieves the object of the present invention is described as follows: "Styrene butadiene copolymer, and styrene butadiene copolymer and milky white olefin synthetic resin having a physical property value of about the same melting temperature. A single layer structure in which the mixing ratio of the milky white olefin-based synthetic resin is 10% or more by weight and the melt-kneaded material is stretched in a uniaxial direction by direct blow within the range of the mixing ratio in which the styrene-butadiene copolymer is rich. A cosmetic container for cosmetics, wherein the milky white olefin synthetic resin is polypropylene and / or low density polyethylene, and the mixing ratio is adjusted to be 40:60 to 10:90 styrene butadiene copolymer rich in weight ratio. Small bottle for use (capacity of about 5 to 20 ml).

  Since the method of the present invention is a method for producing a single layer container by direct blow, it is possible to easily produce small cosmetic bottles (nail color, lip gloss, mascara, etc.) having a capacity of about 5 to 20 ml. is there. And the small bottle for cosmetics which has the favorable pearl luster without a nonuniformity by using the raw material of the said mixing | blending can be manufactured.

  According to the present invention, a cosmetic container (especially a small bottle) having good pearl luster without using a pearl pigment, having a multilayer structure, or forming a preform is provided at low cost. be able to.

  Hereinafter, embodiments of the present invention will be described. In the embodiment, a method of manufacturing a small cosmetic bottle (nail color bottle) having a capacity of 10 ml having a single layer structure by direct blow molding will be described.

  First, as raw materials, styrene butadiene copolymer (hereinafter referred to as “SBP”) pellets (A), milky white olefin synthetic resin (polypropylene (hereinafter referred to as “PP”)), low density polyethylene (hereinafter referred to as “LDPE”). ), And a pellet (B) of a mixture of PP and LDPE). These are mixed well in a weight ratio within the range of pellet (A): pellet (B) = 55: 45 to 90:10 to prepare mixed pellets.

  Next, this mixed pellet is put into a screw type extrusion molding machine for direct blow molding, and the extrusion molding machine is driven to execute heating, melting and kneading. When the raw material in the extruder is sufficiently melted and kneaded, the discharge of the tube-shaped parison having a single-layer structure is started from the discharge port.

  The blow molding die is closed so that the lower end of the parison is pinched off, a blow pin is inserted, and blow air is discharged. At this time, the parison diameter and the parison wall thickness are set so that the blow ratio becomes 2-3 times in relation to the volume of the cavity.

  In this way, a small cosmetic bottle with a white pearl-like appearance can be produced. In addition, when adding the mixed pellets to the extrusion molding machine, it is possible to produce a pearly luster other than white, such as pink by adding a red pigment and blue by adding a blue pigment, by adding a pigment. .

  As raw materials, polypropylene ("Novatec PP (trade name)" manufactured by Nippon Polypro Co., Ltd.), low-density polyethylene ("Novatech LD (trade name)" manufactured by Nippon Polyethylene Co., Ltd.), styrene butadiene copolymer (Chevron Phillips) "K-resin (trade name)" manufactured by Chemical Co., Ltd.) was prepared, and a cosmetic small bottle was produced by direct blow molding at a mixing ratio shown in the following table.

  No. 3-No. 8, no. 10 is an example. No. 1, No. 1 2 is a comparative example. No. 1-No. No. 9 was manufactured in order to investigate the influence of the mixing ratio with SBP on the pearl luster using milk white olefin-based synthetic resin as PP. No. No. 10 was manufactured to confirm that the milky white olefin synthetic resin is not limited to polypropylene.

  No. 1-No. As shown in FIG. 1, a comparative sample for questionnaire was created using 10 and targeted to a total of 35 female subjects including 23 female subjects and 12 male subjects. As a result of asking the question “Please select up to No. 3.”, the results in the table below were obtained. The round numbers in the questionnaire comparison samples are No. 1 in Table 1. It corresponds to.

  As a result of this questionnaire survey, no. No respondent chose 1 (PP100%) bottle within 3rd place.

  On the other hand, no. Nine (SBP100%) bottles were chosen by two men within 3rd place. By the way, the 1st to 3rd place selected by these two men was No.8,9,10.

  In addition, the cumulative number within 3rd place is No. 8 (A: B = 90: 10), 31 votes, no. 10 (A: B = 70: 30), 23 votes, no. 4 (A: B = 60: 40), 21 votes, no. Seven (A: B = 80: 20) 17 votes are the result of more than half of the respondents. Among these, No. 8 (A: B = 90: 10) is about 90% of the respondents.

  Looking only at women, the cumulative number in the third place is No. 8 (A: B = 90: 10), 20 votes, no. 4 (A: B = 60: 40), 16 votes, no. 7 (A: B = 80: 20), 15 votes. High support is obtained in the order of 10 votes (A: B = 70: 30). In both cases, more than half of the female respondents supported it. Among these, No. 8 (A: B = 90: 10) gains support of over 90% of female respondents. In addition, No. In 8 (A: B = 90: 10), more women voted second or third than first. Conversely, no. 4 (A: B = 60: 40) received 11 first place votes corresponding to about half of female respondents. This is no. 4 seems to be because the feeling of pearl in terms of calming rather than shine was felt by the amount of SBP decreased. For women who are consumers of cosmetics, it can be considered that the luxurious feeling of pearly luster caused the first vote.

  For female respondents, no. 10 (A: B = 70: 30) has almost the same number of votes in the first, second and third places. This is no. I think 10 is the result of the best balance between brightness and calmness.

  When viewed only by men, the cumulative number within 3rd place is No. 8 (A: B = 90: 10), 11 votes, no. Nine votes of 10 (A: B = 70: 30) have gained 75% or more support. From this, it can be taken that men tend to prefer a pearly luster with a metallic feel stronger than women. On the other hand, no. Support of about 40% (5 votes) is obtained in 4 (A: B = 60: 40). This is understood to mean that men prefer shine rather, but may also prefer calm pearl luster.

  From the above questionnaire, it can be seen that a mixture of a styrene butadiene copolymer and a milky white olefin synthetic resin is preferable, and the mixing ratio makes the pearl luster feel when the mixture is rich in the styrene butadiene copolymer. And it is good to mix in the range of styrene butadiene copolymer: milk white olefin type synthetic resin = 55: 45-90: 10, desirably 60: 40-90: 10, more desirably 70: 30-90: 10. The result was obtained.

  Next, no. 2, no. 5, no. About the bottle of 8, the result of having measured the tensile yield strength, tensile strength, elongation, bending strength, bending elastic modulus, and whiteness is shown.

  “Tensile yield strength, tensile strength, elongation” is JIS K 7113 (test speed 100 mm / min), and “bending strength, flexural modulus” is JIS K 7171 (test speed 1 mm / min, distance between fulcrums 64 mm). ), “Whiteness” was measured by whiteness measurement (measured by setting a standard value with a standard white plate based on JIS P 8148) with a central wavelength of 457 nm (blue).

  From these measurement results, it is numerical that there is no problem in the physical strength etc. that the plastic bottle should have in the examples, and that the white pearl image is also fully exhibited because sufficient whiteness is obtained. Also confirmed.

  In the embodiment, there is only one type of bottle using LDPE, SBP: LDPE = 70: 30, but as with PP, it is manufactured with an SBP rich mixing ratio of 60:40 to 90:10. In this case, a small bottle that can be said to be sufficiently pearlescent can be produced. The reason for this is that in the answer of the woman to the questionnaire, No. 4 (A: B = 60: 40) is 16 votes. 7 (A: B = 80: 20) is 15 votes. 10 (A: B = 70: 30) has almost the same number of votes as 14 votes, so it can be said that it can be sufficiently predicted. In the answer, No. 30% PP. 5, PP25% No. The lowering of the support rate of 6 may be due to the way the bottles are arranged. No. No. 5 has the highest female support rate. It can be considered that there was a disadvantage of 4 next to the right. Conversely, no. No. 10 was unpopular. It is possible that the fact that it was right next to 9 led to a high support rate. In addition, No. No. 10 is No. Although it is a position just below 5, there is a high possibility that the respondent's psychology is responding with the impression that he felt while comparing side by side with 1, 2, 3,. That is because of the popular No. No. 7 next to the left of No. 7 6 also praises because the number of support was small.

  Therefore, through this example, even in the combination of SBP and LDPE, it is predicted that the SBP rich mixing ratio of 60:40 to 90:10 will make the consumer feel pearly. It can be said that there is sufficient ground. Also, it can be predicted from the relationship between the physical properties that the milky white olefin-based synthetic resin is not made of PP or LDPE alone but is a mixture of both, and the same result will be obtained. Therefore, the present invention is not limited to the examples, and can be implemented at various mixing ratios within the scope of the gist of the present invention. In addition, not only nail color bottles, but also other types of cosmetic small bottles such as lip gloss and mascara bottles (usually around 5-20ml), jars for storing creams (usually The method of the present invention may be applied to the production of several tens of ml to about 100 ml).

It is the front view created as a scanner image of the comparative sample for questionnaires using an example.

Claims (3)

Styrene butadiene copolymer pellets and styrene butadiene copolymer pellets of milky white olefin synthetic resin having the same physical property value as the melting temperature are mixed in the milky white olefin synthetic resin at a weight ratio of 10% or more. Prepare a mixed pellet mixed within the range of the mixing ratio that makes the butadiene copolymer rich,
The mixed pellets are put into a screw type extrusion molding machine for direct blow molding and heated, melted and kneaded, and then discharged as a tube-shaped parison having a further structure from the discharge port.
Close the blow mold to pinch off the lower end of the parison,
A method for producing a cosmetic container, wherein the film is stretched in a cavity of the mold under a blow ratio of 3 or less. A styrene butadiene copolymer and a milky white olefin synthetic resin having a physical property value similar to that of a styrene butadiene copolymer have a mixing ratio of the milky white olefin synthetic resin of 10% by weight or more, and the styrene butadiene copolymer is rich. A cosmetic container having a single-layer structure obtained by stretching a material kneaded and kneaded within a range of a mixing ratio in a uniaxial direction by direct blow. The milky white olefin-based synthetic resin is polypropylene and / or low-density polyethylene, and the mixing ratio is a small bottle adjusted to be rich in a styrene butadiene copolymer having a weight ratio of 40:60 to 10:90. Item 2. A cosmetic container according to Item 2.