method for producing hydrophobic polymers , wherein a hydrophobic polymer is selected ; a set of organisms is selected from among cells and / or cell products ; aggregates are formed by working said cells and / or cell products in said polymers resulting in the formation of a so - called polymer - bio aggregate , wherein there is performed a new function of the thus polymer product . this invention further relates to the use of a so - called p . b . a . obtained therewith in specific applications .