Polyquaternium-6 is a type of synthetic cationic polymer used in personal care and cosmetic products, particularly in hair conditioners and detanglers. It is also known by its INCI (International Nomenclature of Cosmetic Ingredients) name: Polyquaternium-6.

Chemically, Polyquaternium-6 is derived from the polymerization of diallyldimethylammonium chloride (DADMAC), which results in a water-soluble, positively charged polymer. The quaternary ammonium groups within the polymer structure give it conditioning properties that help to improve wet and dry combing of hair, reduce static electricity, and enhance the overall manageability of hair.

When applied to hair, this ingredient coats the hair shaft, providing a smoothing effect, increasing shine, and helping to maintain hair's natural moisture balance. Due to its film-forming capabilities, it can also serve as a mild styling aid and contribute to the formulation stability of hair care products. 

Polyquaternium-6 is considered safe for use in cosmetics when formulated appropriately, and it has been widely accepted in the industry for its effectiveness and compatibility with other ingredients commonly found in hair care formulations.