Classifications

• • A—HUMAN NECESSITIES
  • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
  • A61K—PREPARATIONS FOR MEDICAL, DENTAL OR TOILETRY PURPOSES
  • A61K8/00—Cosmetics or similar toiletry preparations
  • A61K8/18—Cosmetics or similar toiletry preparations characterised by the composition
  • A61K8/19—Cosmetics or similar toiletry preparations characterised by the composition containing inorganic ingredients
  • A61K8/25—Silicon; Compounds thereof
• • A—HUMAN NECESSITIES
  • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
  • A61K—PREPARATIONS FOR MEDICAL, DENTAL OR TOILETRY PURPOSES
  • A61K8/00—Cosmetics or similar toiletry preparations
  • A61K8/18—Cosmetics or similar toiletry preparations characterised by the composition
  • A61K8/19—Cosmetics or similar toiletry preparations characterised by the composition containing inorganic ingredients
  • A61K8/26—Aluminium; Compounds thereof
• • A—HUMAN NECESSITIES
  • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
  • A61Q—SPECIFIC USE OF COSMETICS OR SIMILAR TOILETRY PREPARATIONS
  • A61Q1/00—Make-up preparations; Body powders; Preparations for removing make-up
  • A61Q1/12—Face or body powders for grooming, adorning or absorbing
• • C—CHEMISTRY; METALLURGY
  • C03—GLASS; MINERAL OR SLAG WOOL
  • C03C—CHEMICAL COMPOSITION OF GLASSES, GLAZES OR VITREOUS ENAMELS; SURFACE TREATMENT OF GLASS; SURFACE TREATMENT OF FIBRES OR FILAMENTS MADE FROM GLASS, MINERALS OR SLAGS; JOINING GLASS TO GLASS OR OTHER MATERIALS
  • C03C12/00—Powdered glass; Bead compositions

Definitions

• the present invention relates to glass powder. More specifically, the present invention relates to glass powder suitable for use, for example, in cosmetics.
• Cosmetics may contain powders to improve slipperiness and provide a light scattering effect. Powders are often used in makeup cosmetics, such as foundations. Examples of organic powders that are used include silicone, cellulose, and nylon. Examples of inorganic powders that are used include silica and glass. Patent Document 1 discloses a transparent solid composition that contains spherical powders with an average particle size of 3 to 30 ⁇ m as a cosmetic.
• inorganic powders such as glass powder do not generate microplastics after disposal.
• inorganic powders can cause dryness and flaking on the skin.
• Inorganic powders can also inhibit the moldability of pressed powder-type cosmetics. Therefore, the present invention aims to provide a glass powder suitable for use in cosmetics.
• the present invention provides a method for producing a semiconductor device comprising: D50 is 1 ⁇ m or more and 15 ⁇ m or less, A glass powder having a D50/2 of 8% or more.
• D50 is the particle size at which the cumulative volume from the small particle size side in the particle size distribution measured by a laser diffraction/scattering method is 50%
• D50/2 is the ratio of the cumulative volume from the small particle size side in the particle size distribution to a particle size that is 1/2 of D50.
• the glass powder has a hardness A of 1.5 or more, as measured when pressed into a cylindrical article having a height of 5 mm.
• the press molded body was obtained by applying a pressure of 4 MPa to the glass powder filled inside a die having a cylindrical void therein along the height direction of the cylinder, and the hardness A is a hardness measured using a type A durometer defined in Japanese Industrial Standards (JIS) K 6253-2012.
• the present invention there is provided a glass powder suitable for use in cosmetics.
• the present invention can achieve at least one effect selected from the following i) and ii). i) It tends to give the skin a moist feeling. ii) It is unlikely to impair the moldability of pressed powder type cosmetics.
• FIG. 2 is a diagram showing the results of observing a glass powder according to an example of the present invention with a scanning electron microscope (SEM).
• SEM scanning electron microscope
• main component refers to a component with the highest content by mass.
• Spherical refers to a shape in which the ratio R2/R1 of the diameter R2 perpendicular to the diameter R1 to the longest diameter R1 of the particle is 0.8 or more.
• Truste spherical refers to a shape in which the ratio R2/R1 of the diameter R2 perpendicular to the diameter R1 to the longest diameter R1 of the particle is 0.9 or more.
• the judgment of whether the shape corresponds to "spherical” or “true spherical” can be determined based on an observation image obtained by observation using a SEM.
• the glass powder being "substantially composed of glass particles” means that 90% or more, and even 95% or more of the glass particles constituting the glass powder correspond to the specified glass particles on a number basis. However, the ratio on a number basis can be determined based on 50 particles selected arbitrarily.
• the upper and lower limits of the numerical values described below are not listed individually, but can be any combination of ranges.
• the D50 of the glass powder of this embodiment may be 1 ⁇ m or more, 2 ⁇ m or more, 3 ⁇ m or more, or even 4 ⁇ m or more. If D50 is too small, the dispersibility of the glass powder in the cosmetic may decrease. D50 may be 15 ⁇ m or less, 13 ⁇ m or less, 11 ⁇ m or less, or even 10.5 ⁇ m or less. If D50 is too large, a good touch on the skin may not be maintained. D50/2 may be 8% or more, 10% or more, 12% or more, 14% or more, or even 16% or more, or in some cases, 18% or more. D50/2 is an index indicating the ratio of particles with a relatively small particle size. The upper limit of D50/2 is not particularly limited, but may be 40% or less, 35% or less, or even 30% or less.
• Glass powders with a D50/2 that is not too small tend to give a moist feeling to the skin. This is thought to be because when they come into contact with the skin, there are a sufficient number of small particles interspersed between the relatively large particles. Glass powders are relatively hard compared to organic powders, and are inherently at a disadvantage when it comes to giving a moist feeling. The ability to impart a moist feeling by controlling the particle size distribution is useful in terms of mass production, for example, in that it makes surface modification of inorganic powders unnecessary.
• Glass powders with a D50/2 that is not too small are also excellent in that they are less likely to impede the moldability of cosmetics.
• the degree of influence on the moldability of cosmetics can be evaluated based on the moldability of the glass powder itself.
• the moldability of glass powder can be evaluated based on the hardness of a press molded product made from the glass powder.
• the lower limit of D10 of the glass powder is not particularly limited, but may be 0.3 ⁇ m or more, 0.7 ⁇ m or more, or even 1 ⁇ m or more.
• the upper limit of D10 is also not particularly limited, but may be 8 ⁇ m or less, 5 ⁇ m or less, or even 3 ⁇ m or less.
• the lower limit of D90 of the glass powder is not particularly limited, but may be 1 ⁇ m or more, 5 ⁇ m or more, or even 7 ⁇ m or more.
• the upper limit of D90 is also not particularly limited, but may be 50 ⁇ m or less, 40 ⁇ m or less, or even 25 ⁇ m or less. D10 and D90 can be determined by replacing the "50%" of D50 with "10%" or "90%, respectively.
• the ratio of D90 to D10, D90/D10, is an index showing the spread of the particle size distribution.
• D90/D10 is not particularly limited, but may be 4 or more, 5 or more, or even 6 or more.
• D90/D10 is not particularly limited, but may be 50 or less, 30 or less, 15 or less, 12 or less, or even 10 or less, or in some cases 9 or less.
• An appropriate range of D90/D10, particularly 4 to 20, 5 to 10, or 5 to 9, is appropriate for mitigating the degree of the effect on the moldability of the cosmetic.
• the hardness A of the pressed molded body of the glass powder of this embodiment may be 1.5 or more, 2 or more, or even 2.2 or more, and in some cases 2.5 or more, particularly 3 or more.
• the high hardness of the pressed molded body of the glass powder is an index of mitigating the influence on the moldability of the cosmetic containing the glass powder.
• the upper limit of the hardness A of the pressed molded body of the glass powder is not particularly limited, but is, for example, 20 or less, and further 10 or less. However, the hardness A is based on the hardness measured using a type A durometer.
• the hardness (hardness F) of the pressed molded body of the glass powder of this embodiment may be 60 or more, 70 or more, 80 or more, 90 or more, or even 95 or more. Details of the method for producing the pressed molded body as a test specimen and the method for evaluating the hardness A and F are described in the column of examples. It is assumed that a glass powder having a high hardness of the pressed molded body has relatively small particles sufficiently interposed between relatively large particles.
• the composition of the glass powder is not particularly limited, and may be various compositions mainly composed of an oxide, for example, silicon oxide.
• the glass composition mainly composed of silicon oxide may be various compositions called soda-lime glass, borosilicate glass, aluminosilicate glass, etc.
• the glass composition may be at least one composition selected from the group consisting of borosilicate (Al/Ca/copper/Na), borosilicate (Ca/Al), borosilicate (Ca/Na), and borosilicate (Ca/titanium) as indicated by the INCI (International Nomenclature of Cosmetic Ingredients) name.
• the glass composition may be at least one composition selected from the group consisting of borosilicate (Ca/Al), borosilicate (Ca/Na), and borosilicate (Ca/titanium) as indicated by the INCI name.
• the glass composition may be, as expressed by the INCI name, at least one composition selected from the group consisting of borosilicate (Ca/Al) and borosilicate (Ca/Na).
• the content of boron oxide may be 0 to 13% by mass. In other words, even if a glass composition does not contain boron oxide, it may be a composition containing "borosilicate" in the INCI name.
• the composition of the glass powder may have a higher calcium oxide content than normal soda-lime glass, specifically, a calcium oxide content of 16% or more, or even 18% or more, by mass.
• the composition of the glass powder may have a higher aluminum oxide content than normal soda-lime glass, specifically, a aluminum oxide content of 5% or more, or even 8% or more, by mass.
• the composition of the glass powder may have a lower sodium oxide content than normal soda-lime glass, specifically, a aluminum oxide content of 10% or less, or even 7% or less, by mass.
• glass compositions having a softening point higher than that of soda-lime glass specifically, glass compositions having a softening point of 780° C. or higher, 800° C. or higher, or even 830° C. or higher, are suitable for the glass powder of this embodiment.
• the softening point is the temperature at which the viscosity of glass is 10 7.6 dPa ⁇ s.
• the shape of the particles constituting the glass powder is not particularly limited, and may be spherical or may be a perfect sphere.
• the glass powder may be substantially composed of spherical glass particles.
• the glass powder may be substantially composed of spherical glass particles.
• the glass powder of the present embodiment may have various shapes.
• the glass powder may be substantially composed of solid glass particles. Solid glass particles are more suitable for providing a sufficient moist feeling than hollow glass particles.
• the glass powder can be obtained by, for example, a manufacturing method including crushing raw glass powder.
• the crushing step is not particularly limited, and can be carried out, for example, using various known mills.
• the raw glass powder is also not particularly limited, and raw powders having various shapes such as pellets, flakes, and spheres can be used.
• the grinding conditions for adjusting the particle size vary depending on the grinding method, but for example, in the case of a ball mill, the well-known conditions include grinding time, rotation speed, ball filling rate, ball diameter, etc. After grinding, glass powder above or below a specified diameter may be removed, for example, by using a sieve or filter.
• the adjustment of the particle size distribution itself can be carried out by applying known techniques.
• the method for producing glass powder may further include spheroidizing the glass powder obtained by pulverization.
• the spheroidizing step can be performed, for example, by heating the glass powder.
• the heating temperature can be determined taking into consideration the composition, particle size distribution, etc. of the glass powder. If the heating temperature is too high, glass powder with a small particle size may foam. Furthermore, a moderately low heating temperature is suitable for maintaining the ratio of relatively small particles that make up the glass powder. According to the inventor's investigation, the heating temperature that has been conventionally applied and is preferable for improving production efficiency reduces the ratio of relatively small particles that can be represented by D50/2.
• the cosmetic to be blended with the glass powder of this embodiment is not particularly limited, but is suitable for example for makeup cosmetics such as foundation, face powder, etc. There is also no particular limit to the shape of the cosmetic, but the glass powder of this embodiment is suitable for blending with solid cosmetics.
• the content of the glass powder of this embodiment in the cosmetic may be, for example, 0.1% or more, 5% or more, or even 10% or more, by mass.
• the upper limit of this content is not particularly limited, but may be 90% or less, or even 50% or less.
• this embodiment provides the following technologies:
• the first technique is D50 is 1 ⁇ m or more and 15 ⁇ m or less, A glass powder having a D50/2 of 8% or more.
• D50 is the particle size at which the cumulative volume from the small particle size side in the particle size distribution measured by a laser diffraction/scattering method is 50%
• D50/2 is the ratio of the cumulative volume from the small particle size side in the particle size distribution to a particle size that is 1/2 of D50.
• the second technique is The glass powder according to the first technology has a hardness A of 1.5 or more, as measured when pressed into a cylindrical article having a height of 5 mm.
• the press molded body was obtained by applying a pressure of 4 MPa to the glass powder filled inside a die having a cylindrical void therein along the height direction of the cylinder, and the hardness A is a hardness measured using a type A durometer defined in Japanese Industrial Standards (JIS) K 6253-2012.
• the third technology is The glass powder has a hardness A of 1.5 or more, as measured when pressed into a cylindrical body having a height of 5 mm.
• the press molded body was obtained by applying a pressure of 4 MPa to the glass powder filled inside a die having a cylindrical void therein along the height direction of the cylinder, and the hardness A is a hardness measured using a type A durometer defined in Japanese Industrial Standards (JIS) K 6253-2012.
• the fourth technology is The glass powder according to any one of the first to third techniques is substantially composed of spherical glass particles.
• the spherical shape refers to a shape in which the ratio R2/R1 of the longest diameter R1 to the diameter R2 perpendicular to the longest diameter R1 is 0.8 or more in an image of the particle observed using a scanning electron microscope.
• the fifth technology is The glass powder according to any one of the first to fourth technologies, wherein the ratio D90 to D10, D90/D10, is 4.0 or more.
• D10 is the particle size at which the cumulative volume from the small particle size side in the particle size distribution measured by a laser diffraction/scattering method is 10%
• D90 is the particle size at which the cumulative volume from the small particle size side in the particle size distribution is 90%.
• the sixth technique is The glass powder according to any one of the first to fifth techniques has a glass composition having a softening point of 780° C. or higher.
• the seventh technology is The glass powder according to the first technology has a hardness F of 60 or more, as measured when pressed into a cylindrical article having a height of 5 mm.
• the press-molded body was obtained by using a mold having a cylindrical cavity inside, and applying a pressure of 4 MPa to the glass powder filled inside the mold along the height direction of the cylinder, and the hardness F is a hardness measured using an Asker rubber hardness tester type F.
• the eighth technology is: A cosmetic comprising the glass powder according to any one of the first to seventh technologies.
• the ninth technique is The glass powder has a hardness F of 60 or more, as measured when pressed into a cylindrical body having a height of 5 mm.
• the press-molded body was obtained by using a mold having a cylindrical cavity inside, and applying a pressure of 4 MPa to the glass powder filled inside the mold along the height direction of the cylinder, and the hardness F is a hardness measured using an Asker rubber hardness tester type F.
• the particle size distribution of the glass powder was measured using a laser diffraction/scattering method.
• a particle size distribution measuring device (Microtrac's "MT3300EXII") was used for the measurement.
• the particle sizes at 10%, 50% and 90% of the total volume from the smallest particle size side were measured as D10, D50 and D90, respectively.
• the ratio of the particles from the smallest particle size side to a particle size half the D50 by total volume was obtained as D50/2.
• D90/D10 was calculated.
• the glass powder was compression molded using a metal mold to obtain a cylindrical press molded body.
• the press molded body had a cylindrical shape with a bottom surface having a diameter of 58 mm and a height of 5 mm.
• the compression molding was performed by applying a pressure of 4 MPa along the height direction of the cylinder.
• Shape retention A pressure of 10 kPa was applied to a circular area 10 mm from the center of the bottom surface of the press-molded product, and the change in shape of the press-molded product was observed. The results were evaluated on a two-level scale: G: not easily crumbled, and NG: easily crumbled.
• Hardness A and F of the bottom surface of the press molded body were measured using a type A durometer specified in JIS K 6253-2012 and an Asker rubber hardness meter type F manufactured by Kobunshi Keiki Co., Ltd.
• the measurement time was 1 second, that is, the indication value within 1 second after the durometer or the like was brought into contact with the press molded body was taken as the hardness.
• Example 1 Glass particles having a glass composition corresponding to borosilicate (Ca/Al) were pulverized in a ball mill to obtain glass powder.
• the glass composition of the borosilicate (Ca/Al) used is shown in Table 1. However, since this glass composition also corresponds to borosilicate (Ca/Na) and borosilicate (Ca/titanium), it can be expressed as any of the three types including borosilicate (Ca/Al).
• the softening point of this glass composition was 876°C.
• the grinding conditions of the ball mill were adjusted so that the D50 of the glass powder was 6 ⁇ m.
• the glass powder after grinding had a shape that did not correspond to a spherical shape.
• the obtained glass powder was spheroidized using a flame-type spheroidizing device (Taiyo Nippon Sanso Corporation "CERAMELT").
• the burner combustion temperature of the spheroidizing device was adjusted to a range of 2000 to 2400°C.
• the glass powder was supplied at a rate of 10 kg/h using a raw material feeder.
• the supplied glass powder was heated and spheroidized.
• the spheroidized glass particles were collected using a cyclone, while fine powder of several hundred nanometers or less was collected using a bag filter and separated from the glass particles.
• Example 2 Glass granules were obtained in the same manner as in Example 1, except that the grinding conditions were changed, specifically, that the size of the balls put into the ball mill was increased.
• Example 1 The glass granules were obtained in the same manner as in Example 2, except that the spheroidizing conditions were changed.
• the burner combustion temperature of the spheroidizing apparatus was adjusted to the range of 2400 to 2700°C.
• Comparative Example 2 Glass granules were obtained in the same manner as in Example 1, except that commercially available soda-lime glass particles were used and the grinding conditions were changed, specifically, the ball size was made larger than in Example 2.
• the softening point of the soda-lime glass used was about 730°C.
• Comparative Examples 3 and 4 In Comparative Example 3, spherical silica (AGC Si-Tech Co., Ltd. "L-51”) was used instead of the glass particles, and in Comparative Example 4, spherical silicone (Shin-Etsu Chemical Co., Ltd. "KSP-100”) was used instead of the glass particles, and measurements were performed.

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