244 JOURNAL OF THE SOCIETY OF COSMETIC CHEMISTS sandwich panel between two quartz slides. A clean quartz slide was used as reference. Although these esters exhibit slight absorption in the ultra- violet range, anomalous results were obtained in this series. For example, as the dimethylsiloxane concentration increased the stearyl derivatives absorbed less ultraviolet light, while the behenyl derivatives absorbed more ultraviolet light. This inconsistency may be due to imperfections in the sandwich panel films. Many of the properties characteristic of the fatty alcohol esters suggest specific applications where greater solubility is needed along with retention of the typical silicone properties. The wax-like esters appear to be espe- cially intriguing. Prior to these materials, the only silicones which have been described to the cosmetic industry have been liquids. This different physical form may suggest use of these wax-like materials in lipstick, lip pomade and other solid products. GLYOOL-SILoX^NE COPOLYMERS OF DIMETHYLPOLYSILOXANE The third class of materials is acid-free reaction products of ethylene or polyethylene glycol with dimethylpolysiloxane. The glycol-siloxane copolymers are represented by the following general formula: Me HH Me Me MeSiO(CCO)m (SiO),• SiMe m • 1 Me HH Me Me n 5 0 It is unlikely that either the ethylene glycol or its polymers are terminated directly by a trimethylsilyl group as portrayed in the general formula above. Instead, we believe that the ethylene oxide is likely to be bonded to dimethylpolysiloxane units which are, in turn, ended with the tri- methylsilyl groups. These polymers are similar to the previously described alcohol-ended TABLE 6--TYPICAL PROPERTIES OF GLYCOI.-SILoXANE COPOLYMERS Refractive Specific Surface Me2SiO Freezing Index, Gravity, Tension, Viscosity, G•yco• Content Co•or Point at 25 C 25C/25C dyne/era cs at 25 C Polyethylene Glycol 400 law water 4 C 1.4620 I. 112 Z7.6 97.9 white medium water --2 C 1.4552 I.I O0 24.6 141.3 white high water --3 C 1.4367 1.053 24.6 445.0 white Ethylene Glycol medium water -- 1.4287 13.8 white high water -- 1.4300 13.3 white

NEW SILICONES FOR THE COSMETIC INDUSTRY 245 dimethylsiloxanes in that the bonding between the silicone and non- silicone portion of the molecule is through the carbon-oxygen-silicon linkage. Therefore, under proper conditions, these materials can be hydrolyzed to yield either ethylene or polyethylene glycol and dimethylsiloxane polymer. They differ from the fatty alcohol ended fluids and waxes in that the ethyl- ene or polyethylene oxide are within the polysiloxane chain rather than at the ends• An interesting conjecture arises here. One of these materials might be applied to a moist surface so that it would slowly hydrolyze. This would yield an incompatible, highly water repellent fluid which might afford better protection. TABLE 7--COMPARISON OF COMPATIBILITY OF GLYCOL-SILOXANE COPOLYMERS AND 200 As•) 555 FLUmS WIT• VARIOUS MAdrERIALS * Dow Corning Ethylene glycol Polyethylene glycol 400 Dow Corning 200 Fluid Id%SiO Content Ided. Hi Low Med. Hi 5• Fluid 350 cs Beeswox C C Lonolin C C C C C C Idlnerol oil Petrolotum i Poroffin i i C i i C i Ozokerite i i C C C C i Secoroe oil Tested ot room temperoture os o mix mode up of I port sd•cone to 10 ports materio1 listed C-•compobb•e i--incompot•ble TABLE 7A--CoMPARISON Or COMPATIBILITY OF GLYCOL-SILOXANE COPOLYMEKS AND 200 AND 555 FLUIDS WITH VAl•IOUS MATERIALS* Dow Corning Ethylene glycol Polyethylene glycol 400 Dow Corning 200 Fluid Me,SiO Content Med. Hi Low Med. Hi 555 Fluid 350 r.s Wo*er i i i i 10% Isoproponol C C C C C 95% Ethonol C C C C C 99% Isoproponol C C C C C Ethylene glycol C C C Propylene glycol C C C C Glyce*ine i i C C Tested at room temperature os o mix made up of I part silicone to 10 ports material hsted C---componble •--mcompat•ble