Patent Picks are chosen by the editors from publicly available sources. Today's pick is a silicone rubber powder formed by a hydrosilylation reaction that has low platinum content and can be used for cosmetic applications.
Low platinum-content hydrosilylation reaction-crosslinkable silicone rubber powder
U.S. Patent Application 20150306019
Publication date: Oct. 29, 2015
Inventors: M Wakita
Described in this patent application is a method to produce a hydrosilylation reaction-crosslinkable silicone rubber powder.
The inventor discovered the ability to very effectively lower the platinum metal content in hydrosilylation reaction-crosslinkable silicone rubber powder by washing it using an aqueous solution of at least one type of surfactant; more preferably an aqueous solution including polyoxyethylene alkyl ether or sodium diethylhexyl sulfosuccinate heated to a temperature of 30-99°C.
The powder produced via this method has a platinum metal content ≦ 3.5 ppm by mass. It can be used for various applications, including in cosmetic compositions or as cosmetic raw materials.