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Polysiloxane Gel with Low Crosslinking Density for Make‐up Cosmetics
Author(s) -
Kobayashi Reijiro,
Yabe Shinryo,
Nomura Toshio
Publication year - 1997
Publication title -
polymers for advanced technologies
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.61
H-Index - 90
eISSN - 1099-1581
pISSN - 1042-7147
DOI - 10.1002/(sici)1099-1581(199706)8:6<351::aid-pat646>3.0.co;2-r
Subject(s) - siloxane , silicone , materials science , silicone oil , viscosity , polymer chemistry , cyclohexane , chemical engineering , polymerization , molar mass distribution , composite material , silicic acid , polymer , polymer science , organic chemistry , chemistry , engineering
Silicic anhydride has conventionally and routinely been used as a gelling agent for silicones. In the present study, the mechanism wherein a crosslinked silicone having a specific crosslinking density is swollen in the presence of a silicone oil having a low viscosity to form a stable gel was applied to the manufacture of foundations, and optimum conditions that provide favorable functions and satisfactory organoleptic sensation were studied. Polymethylhydrogen siloxanes with a low crosslinking density were prepared by subjecting α,ω‐divinyl polydimethyl siloxane to addition polymerization. The viscoelasticities of the gels formed by the resultant products and silicone oil were investigated. based on these results, it is concluded that the most suitable product is a low crosslinking density material obtained by adding α,ω‐divinyl polydimethyl siloxane ( M ¯ w : 1.0 kDa) to polymethyl hydrogen siloxane having an average molecular weight of 2.5 kDa under the conditions wherein the concentration of dimethylpolysiloxane (viscosity: 6 × 10 6 m 2 S ‐1 ) is 60%. This product provides an enhanced viscosity at a reduced solids content. © 1997 John Wiley & Sons, Ltd.