Abstract: The invention relates to a process for increasing the oxidation stability of biodiesel, in which at least one aging stabilizer of the structure I where: R=hydrogen, alkyl, alkenyl, alkynyl, alkoxy, alkylaryl, arylalkyl, cycloalkyl, hydroxyl or aryl group A=R5 (AI) or —NR1R2 (AII) and B=R6 (BI), where R1, R2, R3, R4, R5 and R6=hydrogen, alkyl, alkenyl, alkynyl, alkoxy, alkylaryl, arylalkyl, cyclo-alkyl, hydroxyl or aryl group, are the same or different, and the phenyl or naphthyl structural unit in structure I, BII and BIII has one, two or three substituents of the R3, R4 and/or R5 type, is added to the biodiesel to be stabilized in an amount of from 5 to 20 000 ppm (w/w), to the use of these aging stabilizers to increase the oxidation stability of biodiesel, and to the correspondingly oxidation-stabilized biodiesel.

Abstract: A composition comprising a polyamide, 0.01% to 5% by weight of at least one primary antioxidant based on the total mass of the polyamide, and at least one secondary antioxidant.

Abstract: The invention relates to an antioxidant for polyamides containing a sterically hindered phenol of formula (I) as a single primary antioxidant, wherein n is a mixture of whole numbers from 1-5. The invention also relates to compositions containing a polyamide and a compound of formula (I) as a single primary antioxidant.

Abstract: The invention relates to a method of increasing the oxidation stability of biodiesel, which comprises adding a primary antioxidant having a melting point of less than or equal to 40° C. to the biodiesel to be stabilized in an amount of from 10 to 20 000 ppm (w/w), where the primary antioxidant comprises at least one compound having the structure where: R1, R2=hydrogen, a linear alkyl group having from 1 to 20 carbon atoms or where * is a carbon atom of the aromatic ring system, R3, R5=hydrogen, a linear alkyl group having from 1 to 20 carbon atoms, R4=hydrogen, a linear alkyl group having from 1 to 40 carbon atoms, where both the substituents of the type R1 and R2 and those of the type R3 and R5 are in each case identical or different.

Abstract: A method of increasing the oxidation stability of biodiesel, by addition of at least one primary antioxidant of formula I to the biodiesel to be stabilized, in an amount of from 10 to 20 000 ppm (w/w); a biodiesel stabilized by the at least one primary antioxidant of the formula I; and a method of preventing corrosion, blockages in injection pumps, blockages in fuel lines, or a combination thereof, in engines, heaters, or machines utilizing biodiesel as a fuel source, the method being adding the compound of formula I to the biodiesel of the engines, heaters, or machines.

Abstract: The invention relates to an antioxidant for polyamides containing a sterically hindered phenol of formula (I) as a single primary antioxidant, wherein n is a mixture of whole numbers from 1-5. The invention also relates to compositions containing a polyamide and a compound of formula (I) as a single primary antioxidant.