Preparation of micrometer‐sized, multifunctional capsule particles for cosmetic by microsuspension polymerization utilizing the self‐assembling of phase separated polymer method

Abstract

Micrometer-sized polymer particles with encapsulated ultraviolet (UV) absorbent, fluorescent agent, and blue pigment were successfully prepared by microsuspension polymerization utilizing the Self-assembling of Phase Separated Polymer method. The particles were characterized by optical microscope and particle size distribution analysis, and they were evaluated on their usefulness for cosmetic using UV spectrometry, colorimetry, VISIA TM Evolution, and bioassay. The capsule particles had multifunctional properties, which are very attractive in the cosmetic field, especially in whitening, brightening, the improvement of face-texture, and less noticeable pores in face, as well as the protection from UV. Moreover, bioactivities of the particles under the UV irradiation, which were examined with the films prepared from capsule components, revealed not only makeup effect but also the activation of human epidermal keratinocytes. The results suggest the importance of blue light in the field of cosmetics.

Long-Acting and Safe Sunscreens with Ultrahigh Sun Protection Factor via Natural Lignin Encapsulation and Synergy

“…12 Nakai et al prepared polyacrylate/organic sunscreen micro-capsules by microsuspension polymerization. 13 The sunscreen performance of 15% capsules was close to a commercial sunscreen of SPF 24, and it could activate human epidermal keratinocytes. However, chemical sunscreens tend to interact with each other when two or more components are contained in a single capsule, especially under UV radiation.…”

“…Chaudhuri emulsified chemical sunscreens and monomers by long chain alcohols and obtained photostable organic sunscreen capsules by a sol–gel method . Nakai et al prepared polyacrylate/organic sunscreen microcapsules by microsuspension polymerization . The sunscreen performance of 15% capsules was close to a commercial sunscreen of SPF 24, and it could activate human epidermal keratinocytes.…”

Preparation of hybrid composite microspheres containing nanosilicon via microsuspension polymerization

“…Poly(styrene-co-acrylonitrile)-silicon (SAN-Si) hybrid composite microspheres were prepared via microsuspension polymerization. 34,35 St (70 g) was mixed with the modified nano-Si with various Si contents (5 g, 10 g, 15 g, 20 g, and 25 g, denoted as SAN-Si5, SAN-Si10, SAN-Si15, SAN-Si20, and SAN-Si25, respectively), followed by the evaporation of ethanol from the system under reduced pressure at room temperature. The nano-Si could be well dispersed in St monomer because the surface of the nano-Si was partially covered with hydrophobic polymer layers.…”

Synthesis of Micrometer-Sized Poly(methyl acrylate) by Temperature-Step Microsuspension Polymerization with Iodoform Based on the “Radical Exit Depression” Effect§

“…Microsuspension conventional radical polymerization ( ms CRP) in aqueous dispersed systems is one of the most well-known techniques for the synthesis of micrometer-sized polymer and capsule particles such as microspheres, − molecular imprinting particles, , microcapsule-encapsulated phase-change materials − and cosmetics, magnetic particles, , and hollow particles . Compared with other polymerization processes such as bulk and solution polymerizations, it is easier for heat removal, temperature control, and low dispersion viscosity.…”