abstract physical properties conclusions formulation

SiBrid® DiEthicone DE-12, DE-15, & DE-23 (INCI Name: Polydiethylsiloxane): Unique Hybrid Silicones for Sun care D. Dick, L. Fleming, E. Kimble, J. Matisons, B. Arkles, J. Zazyczny

ABSTRACT

FORMULATION

SOLUBILITY OF SUNSCREEN INGREDIENTS H 5C 2

C 2H 5

C 2H 5

C 2H 5

Si O

Si O

Si C 2H 5

C 2H 5

C 2H 5

C 2H 5

m

DiEthicones have a much broader organic compatibility than dimethicones permitting formulating with common raw materials used in sun care, including hydrocarbons, Water Phase esters, waxes, and sunscreens.

DiEthicones maintain DiMethicones beneficial properties of excellent slip, spreading, gas permeability, and water proofness due to similar physical properties, yet DiEthicone possess greater compatibility with common suncare and cosmetic ingredients.

PHYSICAL PROPERTIES Low surface tension enables the DiEthicones to spread easily on the skin and act as a lubricant and detackifying agent. In sunscreens, a small amount of DiEthicone is useful to reduce the tack of materials such as Octocrylene. DiEthicones provide more than the typical silicone “slip”. They give an emolliency, a non-greasy sensation with a silky dry feel, and more cushion than traditional Dimethicones of equal viscosity. Additional benefits of DiEthicone in sun care include hydrophobicity yet non-occlusivity, and permeability to gases including water vapor which results in a more comfortable feel. DiEthicones are inert and chemically stable, non-toxic, non-irritating, and non-sensitizing.

WETTING PROPERTIES Wetting properties were evaluated by preparing pigment grinds in DiEthicone and DiMethicone of equal viscosity. A better wetting vehicle will be more efficient in displacing adsorbed gases from the pigment surfaces. This in turn will produce a grind with lower viscosity. DiEthicones produce dramatic reductions in grind viscosity for dispersions of silane and siloxane modified inorganic pigments or treated and untreated organic pigments.

Sunscreen Ingredient Solubility

UV Absorbers Octinoxate Avobenzone Benzophenone-3 Octocrylene Waxes Butyrospermum Parkii (Shea Butter) Cera alba (Beeswax) Cetyl Alcohol Euphorbia Cerifera (Candelilla) Wax Theobroma Cacao (Cocoa) Seed Butter Ozokerite Paraffin Wax Esters Jojoba Oil Caprylyl/capric Triglyceride Ethylhexyl Palmitate C12-15 Alkyl Benzoate Octyldodecanol Diisopropyl Adipate Isopropyl Myristate Vitamin E Derivatives Vertasil TM-VE1 (Tocopheryloxypropyltrisiloxane) Vitamin E Acetate

DiEthicone/ 20 cSt

Dimethicone/ 20cSt

DE-12

DMS-T12

S 1% 2% 5%

I I I I

S S S S S S S

Hot Hot Hot Hot Hot Hot Hot

I Hot I Hot I Hot I Hot I Hot I Hot I Hot

S S S S S S S

I I PS I I PS S

S

I

S

I

Deionized Water Magnesium Sulfate Butylene Glycol Benzoic Acid

61.10 0.20 4.60 0.20

Oil Phase 1 Escalol 557 1 Escalol 567 2 Abil EM-90 3 Cithrol P3D2 1 Ceraphyl ODS AMS-C-30 Wax 4 White Beeswax 5 Castor Wax

Octinoxate Oxybenzone PEG/PPG 10/1 Cetyl Dimethicone Polyglyceryl-3 Diisostearate Octyldodecyl Stearate C30-45 Alkyl Methicone Beeswax Hydrogenated Castor Oil

7.50 2.00 4.00 0.40 5.00 1.00 1.00 0.50

Grind 6 SiBrid® DE-12 Alkylsilane Treated UFTiO2 7 Hydrolite CG

Polydiethylsiloxane Titanium Dioxide, Trimethoxycaprylylsilane Caprylyl Glycol

7.00 5.00

Suppliers: 1

Ashland 2 Evonik 3 Croda 4 Strahl & Pitsch

5

Vertellus 6 Gelest 7 symrise

CONCLUSIONS

Dispersion Viscosity (cSt) Vehicle DiMethicone/50cSt; DMS-T15 DiEthicone/50cSt; DE-15

Water in Oil Suncreen

55% TiO2 Methicone treated

50% TiO2 AlkylSilane Treated

35% UFTiO2 AlkylSilane treated

60% UFZnO AlkylSilane Treated

8,790

>30,000

>30,000

>30,000

59

552

664

21,000

DiEthicone provides advantages over Dimethicone: • Excellent spreading and blending • Improved solubility in Organic Vehicles • Improved solubility of Sunscreen ingredients • Light, dry skin feel • Superior slip • Cuts tackiness of other raw materials • Hydrophobicity • Better gas permeability • Wets inorganic sunscreens better Florida Sunscreen Symposium September 2013

0.50 100.00