hydrogenated+polyisobutene

Polyisobutene and Hydrogenated Polyisobutene are polymers. In cosmetics and personal care products, Polyisobutene and Hydrogenated Polyisobutene are used in the formulation of lipsticks, they can also be found in eye and facial makeup, skin care products and suntan products. The Food and Drug Administration (FDA) has reviewed the safety of Polyisobutene (butyl rubber) and approved its use in chewing gum base. It is also approved as an [|indirect food additive] for use in [|adhesives] and polymers having incidental contact with food.

The safety of Polyisobutene and Hydrogenated Polyisobutene has been assessed by the [|Cosmetic Ingredient Review] (CIR) Expert Panel. The CIR Expert Panel evaluated the scientific data and concluded that Polyisobutene and Hydrogenated Polyisobutene were safe for use in cosmetics and personal care products. Both Polyisobutene and Hydrogenated Polyisobutene increase the thickness of the [|lipid] (oil) portion of cosmetics and personal care products. Polyisobutene dries to form a thin coating on the skin, hair or nails, and is used to hold together the ingredients of a compressed cake. Hydrogenated Polyisobutene acts as a lubricant on the skin’s surface, which gives the skin a soft and smooth appearance. Polyisobutene is often referred to as butyl rubber and is produced in a wide range of molecular weights; the lower molecular weight Polyisobutenes are very viscous, soft, and tacky semi-liquids while the higher molecular weight Polyisobutenes are tough and elastic rubbery solids. Hydrogenated Polyisobutene is also produced in a wide range of molecular weights and is widely used as a substitute for another cosmetic ingredient, squalene.

cite:http://www.cosmeticsinfo.org/ingredient_details.php?ingredient_id=704