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No. 4
Vol. 42 , No. 3, pp. 226–230, 2008
Development of longwearing lipstick using inorganic‐organic hybrid aggregate
Author(s) -
Baba Y.,
Kawamukai H.,
Matsui Y.,
Igarashi T.,
Nakamura F.,
Shibata M.
Publication year - 2009
Publication title -
international journal of cosmetic science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.532
H-Index - 62
eISSN - 1468-2494
pISSN - 0142-5463
DOI - 10.1111/j.1468-2494.2009.00509_4.x
Subject(s) - polymer , alkyl , pigment , chemical engineering , materials science , chemistry , flocculation , ether , dispersant , organic chemistry , polymer chemistry , dispersion (optics) , physics , optics , engineering
As a popular method for longwearing lipsticks, self‐organizing polymers [e.g. glyceryl ether modified dimethicone (GE)], which can form a gel with a small amount of water are used. However, these polymers have the defect that they tend to inhibit the dispersibility of pigments, especially in a lipstick containing a large amount of liquid isoparaffin that has high moisturizing properties. In this study, the compatibility of the longwearing property and the high dispersibility of pigments in isoparaffin‐rich lipstick has been investigated. The introduction of alkyl chain moieties to the GE structure markedly improved the pigment dispersibility. However, random copolymerization type structure inhibited the longwearing properties. On the other hand, the introduction of an alkyl chain to the both ends of GE did not affect the longwearing properties. For further improvement of the pigment dispersibility, fine silica particles were investigated as a dispersant. The compatibility of longwearing properties and good dispersibility of pigments was achieved with silica particles. TEM observation and 1 H‐NMR measurement revealed that GE was absorbed on silica particles and the silica formed a network in the lipstick composition. We assume that this organic‐inorganic hybrid aggregate has no adverse effect on the properties of pigments in the lipstick, hence no flocculation of pigments occurs. Keywords: longwearing lipstick, polymer, pigment, dispersibility, fine particle silica, glyceryl ether modified dimethicone, moisturizing properties, organic‐inorganic hybrid aggregate, alkyl chain