설명(영) |
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Siloxanes, or more precisely, organo-substituted polysiloxanes, are linear or cyclic polymers of monomeric silicon/oxygen monomers. The polymeric backbone is made up of alternating silicon and oxygen atoms. The silicon atoms may carry a wide variety of substituents which can be the same or different. The chemically least reactive substituents are the methyl or phenyl groups:
Functional end-blocking groups may carry nitrogen or hydroxyl moieties, as in the case of dimethiconol.
Silanes are non-polymeric organo-substituted silicon compounds.
Linear siloxanes are used as opacifiers and lubricants in all types of cosmetic products. The cyclic siloxanes (up to about 7 silicon atoms per ring) are volatile and find use in dry application antiperspirants. Functionally substituted silicones are employed for specific applications in skin and hair care products; the dimethicone
copolyols are useful nonionic surfactants. |