E1210 - Carbomer

Origin

Carbomers are synthetic high molecular weight polymers of acrylic acid, cross-linked with either allyl ethers of pentaerythritol, allyl ethers of sucrose, or allyl ethers of propylene. They are not derived from animal products. Carbomers are produced through a polymerization process, typically involving free radical polymerization in a suitable solvent system. Different types of carbomers exist, varying in molecular weight and cross-linking density, which affects their rheological properties.

Usage

Carbomers are primarily used as thickening, suspending, and emulsifying agents in a wide range of cosmetic, pharmaceutical, and industrial applications. In cosmetics, they contribute to the texture and stability of creams, lotions, gels, and shampoos. They provide a smooth, luxurious feel to products. In pharmaceuticals, carbomers are used in topical formulations, such as gels and creams, to control the release of active ingredients. They are also employed in oral formulations as bioadhesives to prolong drug residence time in the gastrointestinal tract. Industrial applications include use in paints, coatings, and adhesives.

Side Effects

Carbomers are generally considered safe for topical use. They are not readily absorbed through the skin. However, some individuals may experience mild skin irritation or allergic reactions, particularly with prolonged or repeated exposure. The safety of carbomers has been extensively evaluated by regulatory bodies. The Cosmetic Ingredient Review (CIR) Expert Panel has assessed the safety of various carbomers and concluded that they are safe for use in cosmetics when formulated to avoid irritation. There is no established ADI (Acceptable Daily Intake) for carbomers, as they are not intended for ingestion. However, ingestion should be avoided. Inhalation of carbomer powder should also be avoided as it may cause respiratory irritation.

Regulatory Status

Carbomers are approved for use in cosmetics and pharmaceuticals in many countries, including the United States, Europe, and Japan. Regulatory bodies, such as the FDA in the United States and the European Commission in Europe, have established guidelines for the safe use of carbomers in these applications. These guidelines typically specify limits on the concentration of carbomers in different types of products and require that manufacturers conduct safety testing to ensure that their products are safe for consumers.