JP2021024789A - Composite particles and cosmetics containing the same - Google Patents
Composite particles and cosmetics containing the same Download PDFInfo
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- JP2021024789A JP2021024789A JP2019142364A JP2019142364A JP2021024789A JP 2021024789 A JP2021024789 A JP 2021024789A JP 2019142364 A JP2019142364 A JP 2019142364A JP 2019142364 A JP2019142364 A JP 2019142364A JP 2021024789 A JP2021024789 A JP 2021024789A
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- 239000011246 composite particle Substances 0.000 title claims abstract description 49
- 239000002537 cosmetic Substances 0.000 title claims description 14
- 239000002245 particle Substances 0.000 claims abstract description 99
- 239000010419 fine particle Substances 0.000 claims abstract description 71
- 229920002472 Starch Polymers 0.000 claims abstract description 27
- 239000008107 starch Substances 0.000 claims abstract description 25
- 235000019698 starch Nutrition 0.000 claims abstract description 25
- GWEVSGVZZGPLCZ-UHFFFAOYSA-N Titan oxide Chemical compound O=[Ti]=O GWEVSGVZZGPLCZ-UHFFFAOYSA-N 0.000 claims abstract description 23
- OGIDPMRJRNCKJF-UHFFFAOYSA-N titanium oxide Inorganic materials [Ti]=O OGIDPMRJRNCKJF-UHFFFAOYSA-N 0.000 claims abstract description 21
- XLOMVQKBTHCTTD-UHFFFAOYSA-N Zinc monoxide Chemical compound [Zn]=O XLOMVQKBTHCTTD-UHFFFAOYSA-N 0.000 claims abstract description 12
- 229920002261 Corn starch Polymers 0.000 claims abstract description 8
- 239000008120 corn starch Substances 0.000 claims abstract description 7
- 239000011787 zinc oxide Substances 0.000 claims abstract description 6
- 229910000420 cerium oxide Inorganic materials 0.000 claims abstract description 5
- BMMGVYCKOGBVEV-UHFFFAOYSA-N oxo(oxoceriooxy)cerium Chemical compound [Ce]=O.O=[Ce]=O BMMGVYCKOGBVEV-UHFFFAOYSA-N 0.000 claims abstract description 5
- 239000000758 substrate Substances 0.000 claims description 5
- 229920001592 potato starch Polymers 0.000 claims description 3
- -1 sago starch Polymers 0.000 claims description 3
- 244000017020 Ipomoea batatas Species 0.000 claims description 2
- 235000002678 Ipomoea batatas Nutrition 0.000 claims description 2
- 240000003183 Manihot esculenta Species 0.000 claims description 2
- 235000016735 Manihot esculenta subsp esculenta Nutrition 0.000 claims description 2
- 229940100486 rice starch Drugs 0.000 claims description 2
- 229940100445 wheat starch Drugs 0.000 claims description 2
- 229940099112 cornstarch Drugs 0.000 abstract description 7
- 239000011347 resin Substances 0.000 description 9
- 229920005989 resin Polymers 0.000 description 9
- 238000000034 method Methods 0.000 description 8
- 230000002776 aggregation Effects 0.000 description 7
- 239000004677 Nylon Substances 0.000 description 6
- 229920001778 nylon Polymers 0.000 description 6
- 238000004220 aggregation Methods 0.000 description 5
- 230000000694 effects Effects 0.000 description 5
- 238000011156 evaluation Methods 0.000 description 5
- 239000000463 material Substances 0.000 description 4
- 239000000126 substance Substances 0.000 description 4
- 230000000052 comparative effect Effects 0.000 description 3
- 238000005259 measurement Methods 0.000 description 3
- 239000000203 mixture Substances 0.000 description 3
- UQSXHKLRYXJYBZ-UHFFFAOYSA-N Iron oxide Chemical compound [Fe]=O UQSXHKLRYXJYBZ-UHFFFAOYSA-N 0.000 description 2
- 239000000853 adhesive Substances 0.000 description 2
- 230000001070 adhesive effect Effects 0.000 description 2
- 238000005054 agglomeration Methods 0.000 description 2
- 239000008346 aqueous phase Substances 0.000 description 2
- 238000013329 compounding Methods 0.000 description 2
- 230000001815 facial effect Effects 0.000 description 2
- 238000009472 formulation Methods 0.000 description 2
- 230000006872 improvement Effects 0.000 description 2
- 239000002649 leather substitute Substances 0.000 description 2
- 230000007774 longterm Effects 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 238000002156 mixing Methods 0.000 description 2
- 239000011368 organic material Substances 0.000 description 2
- 230000002093 peripheral effect Effects 0.000 description 2
- 239000012071 phase Substances 0.000 description 2
- 229920003229 poly(methyl methacrylate) Polymers 0.000 description 2
- 239000004926 polymethyl methacrylate Substances 0.000 description 2
- 239000000843 powder Substances 0.000 description 2
- 239000012798 spherical particle Substances 0.000 description 2
- 238000003756 stirring Methods 0.000 description 2
- 229920000426 Microplastic Polymers 0.000 description 1
- 239000000817 Petroleum-derived resin Substances 0.000 description 1
- 239000004698 Polyethylene Substances 0.000 description 1
- 239000004793 Polystyrene Substances 0.000 description 1
- RTAQQCXQSZGOHL-UHFFFAOYSA-N Titanium Chemical compound [Ti] RTAQQCXQSZGOHL-UHFFFAOYSA-N 0.000 description 1
- 238000010521 absorption reaction Methods 0.000 description 1
- 230000004931 aggregating effect Effects 0.000 description 1
- 230000003197 catalytic effect Effects 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 239000002131 composite material Substances 0.000 description 1
- 239000011258 core-shell material Substances 0.000 description 1
- 239000013078 crystal Substances 0.000 description 1
- 238000004945 emulsification Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 238000003912 environmental pollution Methods 0.000 description 1
- 239000012535 impurity Substances 0.000 description 1
- 229910010272 inorganic material Inorganic materials 0.000 description 1
- 239000011147 inorganic material Substances 0.000 description 1
- 238000007561 laser diffraction method Methods 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 239000004570 mortar (masonry) Substances 0.000 description 1
- 229920000573 polyethylene Polymers 0.000 description 1
- 229920001296 polysiloxane Polymers 0.000 description 1
- 229920002223 polystyrene Polymers 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 230000000475 sunscreen effect Effects 0.000 description 1
- 239000000516 sunscreening agent Substances 0.000 description 1
- 239000010936 titanium Substances 0.000 description 1
- 229910052719 titanium Inorganic materials 0.000 description 1
Landscapes
- Cosmetics (AREA)
Abstract
Description
本発明は、基材粒子とその表面に付着した微粒子を含む複合粒子に関し、さらに複合粒子を含む化粧料に関する。 The present invention relates to composite particles containing base particles and fine particles adhering to the surface thereof, and further relates to cosmetics containing the composite particles.
複数の微粒子を微粒子よりも相対的に大きい基材粒子の表面に付着させて複合粒子とする技術が知られている。特許文献１には、基材粒子としてナイロン、ＰＭＭＡ等の樹脂粒子を使用し、微粒子として平均粒径が１７５ｎｍ以下の範囲にある紫外線遮蔽微粒子を使用した複合粒子が開示されている。紫外線遮蔽微粒子としては、酸化チタン微粒子、酸化亜鉛微粒子等が開示されている。複合粒子において、基材粒子は、微粒子を担持した状態で保持し、微粒子が凝集することを防止する。凝集が防止されると、紫外線遮蔽微粒子による紫外線遮蔽効果の不均一化が抑制される。 A technique is known in which a plurality of fine particles are attached to the surface of base particles that are relatively larger than the fine particles to form composite particles. Patent Document 1 discloses composite particles using resin particles such as nylon and PMMA as base particles and ultraviolet shielding fine particles having an average particle size in the range of 175 nm or less as fine particles. As the ultraviolet shielding fine particles, titanium oxide fine particles, zinc oxide fine particles and the like are disclosed. In the composite particles, the base particles are held in a state of supporting the fine particles to prevent the fine particles from aggregating. When the aggregation is prevented, the non-uniformity of the ultraviolet shielding effect due to the ultraviolet shielding fine particles is suppressed.
肌に接する用途に供される化粧品に使用される粒子には、滑らかな感触に寄与することが求められる。肌に触れたときの滑らかさは、摩擦感テスターを用いて測定できる平均摩擦係数（ＭＩＵ）により示すことができる。特許文献２には、棒状の酸化チタン粒子を凝集させて得た球状の酸化チタン凝集粒子が低いＭＩＵを有することが開示されている。特許文献２の実施例によると、球状の酸化チタン凝集粒子のＭＩＵは０．２６〜０．６５である。 Particles used in cosmetics used for applications in contact with the skin are required to contribute to a smooth feel. The smoothness when touching the skin can be indicated by the average coefficient of friction (MIU), which can be measured using a friction tester. Patent Document 2 discloses that spherical titanium oxide agglomerated particles obtained by agglomerating rod-shaped titanium oxide particles have a low MIU. According to the examples of Patent Document 2, the MIU of the spherical titanium oxide agglomerated particles is 0.26 to 0.65.
本発明者が知る限り、複合粒子に関しては、肌に触れたときの滑らかさの改善がこれまでに検討されていない。そこで、本発明は、滑らかさに優れた複合粒子を提供することを目的とする。 As far as the present inventor knows, improvement of smoothness when touching the skin has not been studied for composite particles. Therefore, an object of the present invention is to provide composite particles having excellent smoothness.
特許文献２の比較例には、凝集が不十分で扇状、即ち非球状の酸化チタン凝集粒子の平均摩擦係数（ＭＩＵ）は０．７２であったことも報告されている。実施例との対比から、複合粒子についてもその形状を球状とすればその滑らかさは改善すると考えられる。実際に、複合粒子の基材粒子として真球状の樹脂粒子を使用すると、複合粒子の滑らかさは改善した。しかし、検討の過程において、デンプン粒子の使用によっても複合粒子の滑らかさが改善することが見出された。デンプン粒子の形状が真球状でないことから、この効果はデンプンと紫外線遮蔽微粒子とを複合化させたことから生じたと考えられる。 It is also reported in the comparative example of Patent Document 2 that the agglomeration was insufficient and the average friction coefficient (MIU) of the fan-shaped, that is, non-spherical titanium oxide agglomerated particles was 0.72. From the comparison with the examples, it is considered that the smoothness of the composite particles can be improved by making the shape spherical. In fact, when spherical resin particles were used as the base particles of the composite particles, the smoothness of the composite particles was improved. However, in the course of the study, it was found that the use of starch particles also improved the smoothness of the composite particles. Since the shape of the starch particles is not spherical, it is considered that this effect is caused by the composite of starch and UV-shielding fine particles.
すなわち、本発明は、
基材粒子と前記基材粒子に付着した複数の紫外線遮蔽微粒子とを備え、
前記基材粒子がデンプンを含み、
前記紫外線遮蔽微粒子が、酸化チタン、酸化亜鉛及び酸化セリウムから選ばれる少なくとも１種を含む、
複合粒子、を提供する。
That is, the present invention
The base particles and a plurality of ultraviolet shielding fine particles adhering to the base particles are provided.
The substrate particles contain starch and
The UV-shielding fine particles contain at least one selected from titanium oxide, zinc oxide and cerium oxide.
To provide composite particles.
本発明による複合粒子は、肌に滑らかな感触を与えることができる。また、生分解性材料であるデンプンを用いていることから、生分解性にも優れている。本発明は、環境汚染の原因として指摘されているマイクロプラスチックの削減にも寄与しうる。しかも、紫外線吸収微粒子の凝集が基材粒子により抑制されるため、紫外線遮蔽効果においても優れている。 The composite particles according to the present invention can give the skin a smooth feel. Moreover, since starch, which is a biodegradable material, is used, it is also excellent in biodegradability. The present invention can also contribute to the reduction of microplastics, which has been pointed out as a cause of environmental pollution. Moreover, since the aggregation of the ultraviolet absorbing fine particles is suppressed by the base particles, the ultraviolet shielding effect is also excellent.
以下、本発明の実施形態について説明するが、以下の説明は、本発明を特定の実施形態に制限する趣旨ではない。 Hereinafter, embodiments of the present invention will be described, but the following description is not intended to limit the present invention to specific embodiments.
本実施形態の複合粒子は、基材粒子と、基材粒子の表面に付着した複数の紫外線遮蔽微粒子とを備えている。基材粒子はデンプンを含む。紫外線遮蔽微粒子は、酸化チタン、酸化亜鉛及び酸化セリウムから選ばれる少なくとも１種を含む。複合粒子は、典型的には、基材粒子がコアとなり、紫外線遮蔽微粒子がシェルとなるいわゆるコア・シェル構造を有する。紫外線遮蔽微粒子は、基材粒子の表面に担持され、基材粒子により互いの凝集が阻害されている。こうして、紫外線遮蔽微粒子の見かけ上の粒径の変化が抑制され、紫外線遮蔽微粒子による紫外線遮蔽効果が、凝集によって阻害されることなく発揮される。以下、複合粒子を構成する基材粒子及び紫外線遮蔽微粒子を説明し、さらにこれらを複合化する方法、得られる複合粒子の特性、複合粒子を含む化粧料について説明する。 The composite particles of the present embodiment include base particles and a plurality of ultraviolet shielding fine particles adhering to the surface of the base particles. Base particles contain starch. The UV shielding fine particles include at least one selected from titanium oxide, zinc oxide and cerium oxide. The composite particle typically has a so-called core-shell structure in which the base particle is the core and the ultraviolet shielding fine particles are the shell. The ultraviolet shielding fine particles are supported on the surface of the base particles, and the base particles inhibit each other's aggregation. In this way, the change in the apparent particle size of the ultraviolet shielding fine particles is suppressed, and the ultraviolet shielding effect of the ultraviolet shielding fine particles is exhibited without being hindered by aggregation. Hereinafter, the base particles and the ultraviolet-shielding fine particles constituting the composite particles will be described, and further, a method for combining these, the characteristics of the obtained composite particles, and a cosmetic containing the composite particles will be described.
（基材粒子）
基材粒子はデンプンを含む。デンプンは、例えば、とうもろこしデンプン（コーンスターチ）、馬鈴薯デンプン、甘蔗デンプン、タピオカデンプン、サゴデンプン、小麦デンプン及び米デンプンから選ばれる少なくとも１種であり、好ましくはコーンスターチである。基材粒子の平均粒径は、特に制限はないが、例えば３〜１００μｍであり、好ましくは５〜６０μｍであり、より好ましくは５〜５０μｍであり、場合によっては５〜２０μｍ、さらに５〜１８μｍの範囲にあってもよい。本明細書において、平均粒径は、レーザ回折法を用いて測定した体積基準で５０％通過時の粒径により定めることとする。
(Base particles)
Base particles contain starch. The starch is, for example, at least one selected from corn starch (corn starch), horse bell starch, sweet potato starch, tapioca starch, sago starch, wheat starch and rice starch, and is preferably corn starch. The average particle size of the base particles is not particularly limited, but is, for example, 3 to 100 μm, preferably 5 to 60 μm, more preferably 5 to 50 μm, and in some cases 5 to 20 μm, and further 5 to 18 μm. It may be in the range of. In the present specification, the average particle size is determined by the particle size at the time of passing 50% on a volume basis measured by a laser diffraction method.
複合粒子の基材粒子としては、ナイロン、ポリスチレン、ポリエチレン、ＰＭＭＡ等の樹脂粒子が使用されてきた。これらの樹脂粒子は、その形状や表面の起伏を制御して作製することが容易であり、表面が極めて滑らかで真球状の粒子とすることもできる。表面の平滑性が高い真球状の粒子は、それ自体の平均摩擦係数（ＭＩＵ）が十分に低く、複合粒子のＭＩＵの低下にも寄与する。これに対し、デンプン粒子は、多面体、レンズ状等の形状を有し、真球状ではない。しかし、複合粒子として比較すると、デンプン粒子は、ＭＩＵが低い真球状の樹脂粒子よりも、より低いＭＩＵを提供しうる基材粒子となる。 As the base particles of the composite particles, resin particles such as nylon, polystyrene, polyethylene, and PMMA have been used. These resin particles can be easily produced by controlling their shape and surface undulations, and can be made into spherical particles having an extremely smooth surface. Spherical particles with high surface smoothness have a sufficiently low average coefficient of friction (MIU) of their own, which also contributes to a decrease in the MIU of composite particles. On the other hand, starch particles have a shape such as a polyhedron or a lens, and are not spherical. However, when compared as composite particles, starch particles are substrate particles that can provide lower MIU than spherical resin particles with lower MIU.
デンプン粒子は、自然界において迅速に分解される生分解性材料であるため、環境保護の観点からも石油由来の樹脂粒子より優れている。 Since starch particles are biodegradable materials that are rapidly decomposed in nature, they are superior to petroleum-derived resin particles from the viewpoint of environmental protection.
（紫外線遮蔽微粒子）
紫外線遮蔽微粒子は、酸化チタン、酸化亜鉛及び酸化セリウムから選ばれる少なくとも１種を含み、酸化チタンを含むことが好ましい。紫外線遮蔽微粒子は単一種類の無機物から構成されている必要はない。例えば酸化チタン微粒子は、酸化鉄その他の微量不純物を含んでいても紫外線吸収微粒子として支障なく使用できる。酸化チタンの結晶型は、触媒活性が高いアナターゼ型以外、具体的にはルチル型が好ましい。酸化チタン等の微粒子は、クローダジャパン株式会社、堺化学工業株式会社、チタン工業株式会社、テイカ株式会社、石原産業株式会社等から販売されている。
(UV shielding fine particles)
The ultraviolet shielding fine particles contain at least one selected from titanium oxide, zinc oxide and cerium oxide, and preferably contain titanium oxide. The UV shielding fine particles do not have to be composed of a single type of inorganic material. For example, titanium oxide fine particles can be used as ultraviolet absorbing fine particles without any problem even if they contain iron oxide and other trace impurities. The crystal type of titanium oxide is preferably a rutile type, in addition to the anatase type having high catalytic activity. Fine particles such as titanium oxide are sold by Crowder Japan Co., Ltd., Sakai Chemical Industry Co., Ltd., Titanium Industry Co., Ltd., TAYCA Corporation, Ishihara Sangyo Co., Ltd. and the like.
紫外線遮蔽微粒子の平均粒径は１０〜２００ｎｍが好ましい。この平均粒径の下限は、１５ｎｍ以上、場合によっては２０ｎｍ以上であってもよい。上限は、１７５ｎｍ以下、場合によっては１６０ｎｍ以下であってもよい。紫外線遮蔽微粒子の紫外線遮蔽特性は、微粒子の粒径に依存し、通常は粒径が小さいほど吸収波長域が短波長側へとシフトする。例えば、紫外線Ｂ波（ＵＶＢ）の遮蔽のためには、平均粒径１５〜６０ｎｍ程度の紫外線遮蔽微粒子が好適である。また例えば、紫外線Ａ波（ＵＶＡ）の遮蔽のためには、平均粒径７０〜１７５ｎｍ程度の紫外線遮蔽微粒子が好適である。 The average particle size of the ultraviolet shielding fine particles is preferably 10 to 200 nm. The lower limit of the average particle size may be 15 nm or more, and in some cases 20 nm or more. The upper limit may be 175 nm or less, and in some cases 160 nm or less. The ultraviolet shielding property of the ultraviolet shielding fine particles depends on the particle size of the fine particles, and usually, the smaller the particle size, the shorter the absorption wavelength range shifts to the shorter wavelength side. For example, in order to shield ultraviolet B waves (UVB), ultraviolet shielding fine particles having an average particle size of about 15 to 60 nm are suitable. Further, for example, in order to shield ultraviolet A wave (UVA), ultraviolet shielding fine particles having an average particle size of about 70 to 175 nm are suitable.
（複合化の方法）
基材粒子と紫外線遮蔽微粒子との複合化は、基材粒子と微粒子とを、自動乳鉢、ボールミル、ヘンシェルミキサー、ナウターミキサー、レディゲミキサー、Ｖ型ミキサー、ハンマーミル、ピンミル等の混合機を用いて混合することにより実施できる。
(Compounding method)
To combine the base particles and UV-shielding fine particles, use a mixer such as an automatic mortar, ball mill, Henschel mixer, Nauter mixer, Ladyge mixer, V-type mixer, hammer mill, pin mill, etc. It can be carried out by using and mixing.
この複合化は、特許文献１に記載されている方法を参照して実施できる。この方法は、樹脂粒子である基材粒子と微粒子との摩擦帯電により基材粒子と微粒子との間に発生する静電力によって微粒子を基材粒子の表面に付着させる付着工程と、付着工程が終了した後に実施される、微粒子が付着した基材粒子を互いに衝突させて基材粒子に対する微粒子の付着強度を高くする強度向上工程と、を含む。付着工程では、異なる物質が接触して離間するときに帯電列に従って物質が帯電する現象が利用される。基材粒子同士および微粒子同士は、帯電によって同種の電荷を有するために互いに反発するが、異種の電荷を有する基材粒子と微粒子とは互いに引きつけ合う。この静電引力により、基材粒子の表面に微粒子が密に担持される状態となる。強度向上工程では、衝突に伴う衝撃力によって基材粒子と微粒子との付着力が向上する。上述の付着工程および強度向上工程の実施により、従来よりも紫外線微粒子の付着力が向上した複合化粒子を製造することが可能となる。 This compounding can be carried out with reference to the method described in Patent Document 1. In this method, the adhesion step of adhering the fine particles to the surface of the base particles by the electrostatic force generated between the base particles and the fine particles due to frictional charging between the base particles and the fine particles, which are resin particles, and the adhesion step are completed. This includes a strength improving step of colliding the base particles to which the fine particles are attached with each other to increase the adhesion strength of the fine particles to the base particles. In the adhesion process, a phenomenon is utilized in which substances are charged according to a charging sequence when different substances come into contact with each other and separate from each other. The base particles and the fine particles repel each other because they have the same type of charge due to charging, but the base particles and the fine particles having different charges attract each other. Due to this electrostatic attraction, the fine particles are densely supported on the surface of the base particles. In the strength improving step, the adhesive force between the base particles and the fine particles is improved by the impact force due to the collision. By carrying out the above-mentioned adhesion step and strength improving step, it becomes possible to produce composite particles having improved adhesion of ultraviolet fine particles as compared with the conventional case.
この好ましい方法の詳細は特許文献１に記載されている。すなわち、上述の付着工程および好ましい強度向上工程は、例えばヘンシェルミキサーを用いて実施することができる。具体的には、基材粒子および微粒子をヘンシェルミキサー内に投入して攪拌翼を第１速度で所定時間回転させて基材粒子と微粒子とを混合することにより付着工程を実施し、引き続き、このヘンシェルミキサーの攪拌翼を第１速度よりも大きい第２速度で所定時間回転させて強度向上工程を実施するとよい。強度向上工程は、ヘンシェルミキサー内に、表面が無機物または金属により構成された粒子としては紫外線吸収微粒子が付着した基材粒子のみを投入して実施される。上記における「所定時間」は、投入する粒子の量等によって相違するが、付着工程については例えば１分間以上、特に２〜１０分間、１０分間以上でも付着状態は良好であるが、長時間の製造はコスト効率が悪くなる。強度向上工程については例えば１５分間以上、特に２０〜６０分間である。６０分間以上でも強度向上の効果があるが、長時間の製造はコスト効率が悪くなる。 Details of this preferred method are described in Patent Document 1. That is, the above-mentioned adhesion step and preferable strength improvement step can be carried out using, for example, a Henschel mixer. Specifically, the substrate particles and the fine particles are put into the Henshell mixer, the stirring blade is rotated at the first speed for a predetermined time, and the substrate particles and the fine particles are mixed to carry out the adhesion step. It is preferable to carry out the strength improving step by rotating the stirring blade of the Henschel mixer at a second speed higher than the first speed for a predetermined time. The strength improving step is carried out by charging only the base particles to which the ultraviolet absorbing fine particles are attached as the particles whose surface is composed of an inorganic substance or a metal into the Henschel mixer. The "predetermined time" in the above varies depending on the amount of particles to be charged, etc., but the adhesion state is good even for, for example, 1 minute or more, particularly 2 to 10 minutes, 10 minutes or more, but long-term production. Is less cost effective. The strength improving step is, for example, 15 minutes or more, particularly 20 to 60 minutes. Although there is an effect of improving the strength even for 60 minutes or more, long-term production becomes cost-effective.
処理時間の経過に伴い、複合化が進行し、凝集しているデンプン粒子の間に微粒子が入りこみ、凝集を解砕し、デンプン粒子の表面に微粒子が撃ち込まれて、複合化が促進される。 As the treatment time elapses, the compositing progresses, the fine particles enter between the agglomerated starch particles, the agglomeration is crushed, and the fine particles are shot into the surface of the starch particles to promote the compositing.
上述の方法によれば、他の材料の接着力に頼ることなく基材粒子に紫外線遮蔽微粒子を付着させることができる。したがって、紫外線遮蔽微粒子と基材粒子とを内包して一体化するワックス等の有機材料が存在しなくても、紫外線遮蔽微粒子と基材粒子との付着状態が保持される。本実施形態では、基材粒子及び紫外線遮蔽微粒子を共に被覆してこれらを一体化する有機材料が複合粒子に含まれている必要がない。 According to the above method, the ultraviolet shielding fine particles can be attached to the base particles without relying on the adhesive force of other materials. Therefore, even if there is no organic material such as wax that encloses and integrates the ultraviolet shielding fine particles and the base particles, the adhered state of the ultraviolet shielding fine particles and the base particles is maintained. In the present embodiment, it is not necessary for the composite particles to contain an organic material that coats both the base particles and the ultraviolet shielding fine particles and integrates them.
基材粒子と紫外線吸収微粒子との合計量に対する紫外線吸収微粒子の質量基準の比率は、特に制限されないが、５０％以上、さらには５５％以上、特に６０％以上、とりわけ６５％以上とすることが好ましい。 The ratio of the mass-based ratio of the ultraviolet absorbing fine particles to the total amount of the base particles and the ultraviolet absorbing fine particles is not particularly limited, but may be 50% or more, further 55% or more, particularly 60% or more, particularly 65% or more. preferable.
（複合粒子の特性）
本実施形態の複合粒子の平均摩擦係数（ＭＩＵ）は、０．２３以下、さらに０．２２以下にまで低下させることが可能である。ただし、ＭＩＵの値は、紫外線遮蔽微粒子の種類や基材粒子と微粒子との比率等によって相違するため、本実施形態の複合粒子のＭＩＵが上記に制限されるわけではない。本実施形態の複合粒子は、微粒子の種類等が同じであれば、従来の樹脂粒子を用いる場合よりも低いＭＩＵを有しうる。
(Characteristics of composite particles)
The average coefficient of friction (MIU) of the composite particles of the present embodiment can be reduced to 0.23 or less, and further to 0.22 or less. However, since the value of MIU differs depending on the type of ultraviolet shielding fine particles, the ratio of the base particles to the fine particles, and the like, the MIU of the composite particles of the present embodiment is not limited to the above. If the types of fine particles are the same, the composite particles of the present embodiment may have a lower MIU than when conventional resin particles are used.
（化粧料）
本実施形態の複合粒子は、化粧料への配合に適している。本実施形態の複合粒子を含む化粧料は、その種類が特に制限されるわけではないが、フェーシャル化粧料、メーキャップ化粧料等である。特にファンデーション、フェイスパウダー等のフェーシャル化粧料では、紫外線を遮蔽する材料へのニーズが特に高い。化粧料の形態は、特に制限されないが、粉末状、ケーキ状、ペンシル状、スティック状、軟膏状、液状、乳液状、クリーム状等である。
(Cosmetics)
The composite particles of the present embodiment are suitable for blending into cosmetics. The type of the cosmetic containing the composite particles of the present embodiment is not particularly limited, but is a facial cosmetic, a makeup cosmetic, and the like. Especially in facial cosmetics such as foundations and face powders, there is a particularly high need for materials that block ultraviolet rays. The form of the cosmetic is not particularly limited, but may be powdery, cake-like, pencil-like, stick-like, ointment-like, liquid, milky-like, cream-like or the like.
以下、実施例により本発明をさらに説明するが、本発明は以下に制限されるわけではない。 Hereinafter, the present invention will be further described with reference to Examples, but the present invention is not limited to the following.
［複合粒子］
（実施例１）
デンプン粒子として日本コーンスターチ株式会社製コーンスターチホワイト（図１参照；平均粒径１５μｍ）を、酸化チタン微粒子としてテイカ株式会社製ＭＴ１００ＴＶ（平均粒径１５ｎｍ）をそれぞれ用いた。
[Composite particles]
(Example 1)
Cornstarch white manufactured by Japan Corn Starch Co., Ltd. (see FIG. 1; average particle size 15 μm) was used as the starch particles, and MT100TV manufactured by TAYCA Corporation (average particle size 15 nm) was used as the titanium oxide fine particles.
デンプン粒子４０質量部と酸化チタン微粒子６０質量部とをヘンシェルミキサーに投入し、周速４０ｍ／秒で３分間混合した。処理物の見掛け比容は１．６ｍＬ／ｇであった。次いで、周速１００ｍ／秒で２０分間継続して処理し、複合粒子を得た（図２参照）。 40 parts by mass of starch particles and 60 parts by mass of titanium oxide fine particles were put into a Henschel mixer and mixed at a peripheral speed of 40 m / sec for 3 minutes. The apparent specific volume of the treated product was 1.6 mL / g. Then, the treatment was continued for 20 minutes at a peripheral speed of 100 m / sec to obtain composite particles (see FIG. 2).
（比較例１）
デンプン粒子に代えて真球状ナイロン粒子である東レ株式会社製ＳＰ１０（図３参照；平均粒径１０μｍ）を用いたことを除いては実施例１と同様にして、複合粒子を得た（図４参照）。
(Comparative Example 1)
Composite particles were obtained in the same manner as in Example 1 except that SP10 manufactured by Toray Industries, Inc. (see FIG. 3; average particle size 10 μm) was used instead of the starch particles (FIG. 4). reference).
上記から得た各複合粒子と用いた各基材粒子について、カトーテック株式会社製摩擦感テスターＫＥＳ−ＳＥを用いて、平均摩擦係数（ＭＩＵ）を測定した。摩擦子にはシリコーンを用い、荷重は２５ｇ、測定速度は１ｍｍ／秒とした。測定対象は、基材粒子又は複合粒子５ｍｇを人工皮革である出光テクノファイン社製サプラーレ（登録商標；人工皮革）の２４ｃｍ2（８×３ｃｍ）の上に均一に散布したものを用いた。得られた結果を表１に示す。 The average friction coefficient (MIU) of each composite particle obtained from the above and each base particle used was measured using a friction tester KES-SE manufactured by Kato Tech Co., Ltd. Silicone was used for the friction element, the load was 25 g, and the measurement speed was 1 mm / sec. As the measurement target, 5 mg of base particles or composite particles were uniformly sprayed on 24 cm 2 (8 × 3 cm) of Suplarre (registered trademark; artificial leather) manufactured by Idemitsu Technofine Co., Ltd., which is artificial leather. The results obtained are shown in Table 1.
複合化することにより、デンプン粒子のＭＩＵは真球状ナイロン粒子のＭＩＵを下回った。なお、樹脂粒子の中では、ＳＰ１０は、形状が真球状であって特に低いＭＩＵを有する。例えば、非球状のナイロン粒子（図５参照；アルケマ社製オルガゾル（登録商標）グリーンタッチ）のＭＩＵを測定したところ、０．４９１であった。このような樹脂粒子を基材粒子として複合粒子を作製しても、複合粒子のＭＩＵの値は酸化チタン微粒子の凝集により得られる最低値０．２６（特許文献２参照）を下回らない。 By compositing, the MIU of starch particles was lower than the MIU of spherical nylon particles. Among the resin particles, SP10 has a spherical shape and a particularly low MIU. For example, the MIU of non-spherical nylon particles (see FIG. 5; Arkema's Organsol® Green Touch) was measured and found to be 0.491. Even if composite particles are produced using such resin particles as base particles, the MIU value of the composite particles does not fall below the minimum value of 0.26 (see Patent Document 2) obtained by aggregation of titanium oxide fine particles.
［化粧料］
（実施例２〜３／比較例２〜３）
表２に示した処方でサンスクリーンを調製した。具体的には、成分１〜９（油相）と成分１０〜１３（水相）とをそれぞれ攪拌混合し、その後、水相を油相に加えて乳化した。なお、複合粒子は、酸化チタン微粒子としてＭＴ１００ＴＶに代えてクローダジャパン株式会社製「ソラベールＸＴＰ−１」を用いたことを除いては、実施例１と同様にして作製したものを用いた。また、表３に示した処方でパウダーファンデーションを調製した。具体的には、成分１〜７を混合粉砕して高速ブレンダーに移し、さらに成分８〜１２を混合溶解したものを加えて混合し粉砕した。次いで得られた混合物を中皿容器にプレス成型した。
[Cosmetics]
(Examples 2-3 / Comparative Examples 2-3)
Sunscreens were prepared according to the formulations shown in Table 2. Specifically, the components 1 to 9 (oil phase) and the components 10 to 13 (aqueous phase) were stirred and mixed, and then the aqueous phase was added to the oil phase for emulsification. As the composite particles, those produced in the same manner as in Example 1 were used except that "Solabert XTP-1" manufactured by Croda Japan Co., Ltd. was used instead of MT100TV as the titanium oxide fine particles. In addition, a powder foundation was prepared according to the formulation shown in Table 3. Specifically, the components 1 to 7 were mixed and pulverized and transferred to a high-speed blender, and the components 8 to 12 were further mixed and dissolved, mixed and pulverized. The resulting mixture was then press molded into a medium dish container.
ＳＰＦ測定結果を表４に示す。伸び（伸展製）、ざらつき、きしみ感、フィット感（付着性）といった化粧感触の評価項目について、それぞれ１０名の専門パネラによる使用テストを実施し、下記評価点基準に基づいて各人の評価点を合計した。結果を表５に示す。
・評価点基準
５点：非常に優れている
４点：優れている
３点：普通
２点：劣る
１点：非常に劣る
・評価基準
◎：合計点が４０点以上である。
○：合計点が２０点以上３０点未満である。
△：合計点が１０点以上２０点未満である。
×： 合計点１０点未満である。
The SPF measurement results are shown in Table 4. For the evaluation items of cosmetic feel such as elongation (made by extension), roughness, squeaky feeling, and fit (adhesiveness), use tests were conducted by 10 specialized panelists, and each person's evaluation points were based on the following evaluation point criteria. Was summed up. The results are shown in Table 5.
-Evaluation score criteria 5 points: Very good 4 points: Excellent 3 points: Normal 2 points: Inferior 1 point: Very poor-Evaluation criteria ⊚: Total score is 40 points or more.
◯: The total score is 20 points or more and less than 30 points.
Δ: The total score is 10 points or more and less than 20 points.
X: The total score is less than 10 points.
Claims (6)
前記基材粒子がデンプンを含み、
前記紫外線遮蔽微粒子が、酸化チタン、酸化亜鉛及び酸化セリウムから選ばれる少なくとも１種を含む、
複合粒子。 The base particles and a plurality of ultraviolet shielding fine particles adhering to the base particles are provided.
The substrate particles contain starch and
The UV-shielding fine particles contain at least one selected from titanium oxide, zinc oxide and cerium oxide.
Composite particles.
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Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
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| JP2002146238A (en) * | 2000-08-31 | 2002-05-22 | Miyoshi Kasei Kk | Novel composite powder and cosmetic incorporating the same |
| JP2004315467A (en) * | 2003-04-18 | 2004-11-11 | Miyoshi Kasei Inc | Sebum adsorbing powder and use thereof |
| WO2016190399A1 (en) * | 2015-05-28 | 2016-12-01 | 堺化学工業株式会社 | Sebum adsorbent and cosmetic comprising same |
| JP2017109928A (en) * | 2015-12-14 | 2017-06-22 | ロレアル | Composite particles |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2002146238A (en) * | 2000-08-31 | 2002-05-22 | Miyoshi Kasei Kk | Novel composite powder and cosmetic incorporating the same |
| JP2004315467A (en) * | 2003-04-18 | 2004-11-11 | Miyoshi Kasei Inc | Sebum adsorbing powder and use thereof |
| WO2016190399A1 (en) * | 2015-05-28 | 2016-12-01 | 堺化学工業株式会社 | Sebum adsorbent and cosmetic comprising same |
| JP2017109928A (en) * | 2015-12-14 | 2017-06-22 | ロレアル | Composite particles |
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