Body powders

Cosmetics. Talc is widely used in baby and body powders, pressed powders, creams, and antiperspirants. Its softness, sHp, inertness (fragrance retention), and relative safety make this one of the oldest and most widely recognized appHcations for talc. Talc is also used in chewing gum as a detackifier and in tableting as a lubricating process aid. 

Powder Blending. Cosmetic powders serve two primary functions. One group, commonly called body powders or talcs, is appHed to the skin to provide lubricity and to absorb excessive moisture. The second group, commonly referred to as face powders, exists in both loose and compressed forms and is used to impart some color to the skin and to dull excessive oiliness. 

Refined borax (Na B Op is an additive in laundry products such as soaps and water-softening compounds. Also used for cosmetics, body powders, and the manufacture of paper and leather. Borax is an environmentally safe natural herbicide and insecticide. 

The softest mineral, talc, can be used in body powder. The hardest, diamond, is used in drill bits to cut through the most dense crustal materials. Mohs scale is a relative index scale, meaning that a determination of Mohs hardness number for a mineral is based upon scratch tests. For example, gypsum (Mohs hardness number = 2) will scratch talc (Mohs hardness number = 1). Talc, however, will not scratch gypsum. Glass is assigned a Mohs hardness number of 5.5 because it will scratch apatite (Mohs hardness number = 5) but will not scratch orthoclase feldspar (Mohs hardness number = 6). 

ITRI has developed and patented processes for preparing and utilizing stable aqueous colloidal sols of tin(IV) oxide and related materials. These products, which contain nanometer-scale particulate tin oxide, are useful precursors for the synthesis of ceramic bodies, powders, and coatings, and may And application in encapsulated pigments, electroconductive materials, catalysts, and transparent tin oxide Aims on glass and other substrates. 

Uematsu K (1996) Immersion microscopy for detailed characterization of defects in ceramic powders and green bodies. Powder Technol 88 291-298... 

Definition Aluminum salt of the prod, of octenyl/succinic anhydride with starch Toxicology TSCA listed Uses Absorbent, vise, control agent in cosmetics, body powders, antiperspirants, feminine hygiene sprays, foot powders food starch modified food pkg. adhesives Regulatory FDA 21CFR 172.892, 175.105 Trade Name Synonyms Dry Flo PC [Nat l. Starch Chem. 

Body and face powders are used to dry and smooth the skin. The main ingredient in both types of powder is talc (Mg3(Si20s)2(0H)2), a mineral that absorbs both oil and water. Astringents are added to reduce sweating, and binders are added to help the powders stick to the skin better. Face powders often contain dyes to give color to the skin. Table 17-2 shows a typical formulation for body powder, and Table 17-3 shows a typical formulation for face powder. 

Touhnin Jr HA. Dextran compound coated body powder 1956. Patent US 2749277 A. 

There is little commonality in the scientific methods, processes, and formulations required for the wide variety of cosmetics and toiletries in the market. Products range from preparations for hair, oral, and skin care to lipsticks, nail polishes and extenders, deodorants, body powders and aerosols, to quasi-pharmaceutical over-the-counter products such as antiperspirants, dandruff shampoos, antimicrobial soaps, and acne and sun screen products. 

Function in Formula Controlled delivery of silicones, esters, mineral oils, solvents, waxes, glycerols, glycols, water, perfumes to the skin. Allows formulator to combine incompatible materials in same formula. Reduces comedone formation. Absorbs excess oil and sebum from the skin. Used in pigmented makeup, sun care products, skin creams, and lotions, antiperspirants and deodorants, body powders, perfumes, pressed powders, facial cleansers Solubility Characteristics Insoluble, cross-linked polymer... 

Adsorption of Colloids by Other Substances. — Cases where a colloid can be completely removed from a liquid by porous bodies, powder, or jelly-like substances, are of common occurrence.J Colloidal gold can be separated from the liquid by animal charcoal, barium sulfate, or aluminium hydroxide gels. The process may be followed... 

W.R. Spence, High absorption body powder, US Patent 4 272 514, assigned to Spenco Medical Corporation (Waco, TX), June 9,1981. 

Andrievski, R. A. (1982). Strength of sintered bodies. Powder Metal. (Russia) 1, 37-43. 

HN If you have sensitive skin, consider packing emollients for dry skin or cornstarch-based body powder (avoid talc, as it s harmful when breathed into the lungs). 

Talc or body powders Electrochemical Yang and Leng (1988)... 

---