DECORATIVE AQUEOUS COMPOSITION AND METHOD FOR PRODUCING SAME
|Posted date||Oct 25, 2019|
|International application number||2019JP005758|
|International publication number||WO 2019160132|
|Date of international filing||Feb 18, 2019|
|Date of international publication||Aug 22, 2019|
|Title||DECORATIVE AQUEOUS COMPOSITION AND METHOD FOR PRODUCING SAME|
[Problem] To provide: a decorative aqueous composition that contains particles of opal-like colloidal crystals uniformly and stably dispersed in an aqueous dispersion medium, and exhibits a structural color due to light interference; and a method for producing the decorative aqueous composition.
[Solution] The present invention provides a decorative aqueous composition that contains particles of opal-like colloidal crystals dispersed in an aqueous dispersion medium in which a polymer is dissolved, wherein the particles of opal-like colloidal crystals are composed of hydrophilic colloid particles having an average particle size in the range of 10-1000 nm and having a particle size variation coefficient of 20% or less. Thus, this decorative aqueous composition contains opal-like colloidal crystals uniformly and stably dispersed in an aqueous dispersion medium, and exhibits a structural color due to light interference. As a result, the decorative aqueous composition can be suitably used for lotions and the like.
|Outline of related art and contending technology||
The colloidal crystal, having a size of several nm µm number of uniform particle diameters of the particles are aligned in an ordered periodically refers to the ordered structure is formed. Colloidal crystal comprises, in the same manner as a normal crystal, the lattice plane spacing corresponding to the Bragg diffraction of an electromagnetic wave. The diffraction wavelength, the manufacturing conditions (the particle density, particle size, particle refractive index of the medium or the like) can be selected, such as a visible light region or infrared region, can be set to different wavelength regions. Therefore, the colloidal crystal is dispersed in the aqueous dispersion medium, the aqueous composition and decorative aglint a technique has been developed (for example JP-1-3).
However, two types of colloidal crystal 3 as is well known. Charged colloidal crystal and the first, the surface charge of the colloidal particles charged by the dispersion in the (charged colloidal system), the electrostatic repulsion acting between particles are formed. As shown in Fig. 1, electrostatic repulsion is small, colloidal particles to move freely in the Brownian motion, a random position. However, the stronger the electrostatic repulsion of the particles will move away from the other particles will result in as much as possible, are arranged at predetermined lattice spacing of the colloidal crystal is formed. For electrostatic repulsive force is up to a long distance, low particle concentration (that is, the longer the distance between the particles) at the crystals.
The second is a rigid sphere repulsion between particles acts only as a rigid sphere in the colloidal crystal system. Within a limited space is allocated to a number of macroscopic sphere, the sphere is a regular arrangement as crystalline, colloidal crystal system is a rigid sphere, similar to this phenomenon. Dominated crystallization of the particles in the dispersion parameter is only the volume fraction φ, as shown in Fig. 2, crystallization occurs at about φ=0.49 (Alder referred to as transition). Φ 0.49 is at a high concentration of>, random particles are arranged is more regular than the number of possible arrangement of the particles is increased, disorder in the crystalline state than that of the entropy is rather increased. Therefore, the rigid body ball system is not a close-packed colloidal crystal comprises conditions, particles are in contact with the crystal structure is not formed.
The third is in the colloidal crystal is opal, as shown on the right side of Fig. 2, the contact particles have a crystal structure filling. Silica particle diameter of the gem opal aligned fine particles are precipitated (SiO2) close-packed colloidal crystal structure is converted, a close-packed colloidal crystal particles and the colloidal crystal, typically referred to as colloidal crystal opal. At this time the volume fraction, depending on the crystal structure, for example 0.68 in the body-centered cubic lattice, face-centered cubic lattice is about 0.74.
The aforementioned Patent Documents 1-3 described in the aqueous composition is decorative, the colloidal crystal of type 3 of the charged colloidal crystals with the present invention. That is, the charged colloidal crystal is formed in the aqueous dispersion medium and, by the interference of visible light and a colored fluid aglint structure. Therefore, the decorative water or the like has been proposed in the application.
However, the colloidal crystal is charged and the higher the salt concentration is reduced and the electrical repulsion, the colloidal particles and it is difficult to keep a certain distance. For example, a dilute colloidal particles in such a case, the salt concentration is 10μm or more the number of charged colloidal crystal is not formed. In addition, the concentration of the colloidal particles is 10% or more, the salt concentration is at least about 0.1mm of the charged colloidal crystal is not formed. Therefore, stable charged colloidal salt concentration to 0.1mm or more cannot be formed. Cosmetics such as lotions an ionic additive or a pH buffer or included in the order, such as decorative cosmetics is used has been practically difficult.
On the other hand, the colloidal crystal system is a rigid sphere, the volume fraction of the particles 0.5 than that of the high-concentration is required, such as decorative cosmetics it is difficult to use. In addition, in the case of a colloidal crystal opal, the volume fraction of particles 0.74 is further than that of the high-concentration is required, this decorative cosmetics and the like is used, more difficult.
The rigid body ball-grinding the colloidal crystal opal or colloidal crystals, dispersed in a dispersion medium and exhibiting the structural color can be considered, these colloidal crystal to the milled product is stably dispersed in the liquid for a long time is difficult, a uniform color is also difficult.
In addition, the inventors of the present invention, a method of manufacturing a colloidal crystal of the opal, uniform particle diameter of the colloidal dispersion of the colloidal particles of the type 2 system by dissolving the polymer, the precipitated colloidal particles of the colloidal opal has been found to be the eutectic (Patent Document 4). This method is the colloidal particles to precipitate out of the eutectic structure is formed and that, the colloidal crystal is opal-not been dispersed in the dispersion medium, the colloidal crystal is opal-aqueous solvent and the aqueous composition is in a state where the decorative image that is not in.
In addition, the aqueous dispersion medium is not, as the dispersion medium using a naphthalene, and 2 types of cross-linking polystyrene particles, a mixture of a polystyrene polymer of the type of lines 1 in the system, the multiple different types of the lattice constant of the dispersed in the colloidal crystal is opal-ethylnaphthalene coexistence has been found that the phenomenon (non-patent document 1).
|Scope of claims||
|IPC(International Patent Classification)||
National States: AE AG AL AM AO AT AU AZ BA BB BG BH BN BR BW BY BZ CA CH CL CN CO CR CU CZ DE DJ DK DM DO DZ EC EE EG ES FI GB GD GE GH GM GT HN HR HU ID IL IN IR IS JO JP KE KG KH KN KP KR KW KZ LA LC LK LR LS LU LY MA MD ME MG MK MN MW MX MY MZ NA NG NI NO NZ OM PA PE PG PH PL PT QA RO RS RU RW SA SC SD SE SG SK SL SM ST SV SY TH TJ TM TN TR TT TZ UA UG US UZ VC VN ZA ZM ZW
ARIPO: BW GH GM KE LR LS MW MZ NA RW SD SL SZ TZ UG ZM ZW
EAPO: AM AZ BY KG KZ RU TJ TM
EPO: AL AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HR HU IE IS IT LT LU LV MC MK MT NL NO PL PT RO RS SE SI SK SM TR
OAPI: BF BJ CF CG CI CM GA GN GQ GW KM ML MR NE SN ST TD TG
Contact Information for " DECORATIVE AQUEOUS COMPOSITION AND METHOD FOR PRODUCING SAME "
- Nagoya City University Liaison Center
- URL: https://www.nagoya-cu.ac.jp/
- Address: 1, Aza Kawasumi, Mizuho-cho, Mizuho-ku, Nagoya-shi, Aichi, Japan , 467-8601
- Fax: 81-52-841-0261