Polyaminopropyl biguanide

Polyaminopropyl biguanide is a polymer containing biguanide group connected with a three methylene linker. The polymer is a propyl analogue of polyhexamethylene biguanide. The polymer displays some antibacterial activity, although much lower than PHMB.
As of May 2024, PAPB is not approved as a biocidal active substance under EU regulations.

Name controversy

In some sources, particularly in lists of cosmetic ingredients, the name polyaminopropyl biguanide is wrongly associated with polyhexamethylene biguanide