Acetal derivatives as extreme pressure additives for lubricants

摘要

Acetal and thioacetal derivatives of the formula I <IMAGE> (I) in which R1 and R2 are identical or different C1-C12 alkyl or together are C4-C7 alkylene, X and Y are identical or different and are each O or S and R3 is C1-C18 alkyl, C6-C18 aryl, C7-C9 aralkyl, carboxy-(C1-C2)-alkyl, (C1-C18-alkoxy)-carbonyl-(C1-C2)-alkyl, N-C1-C18-alkylated carbamoyl-(C1-C2)-alkyl or an ammonium salt of an amine with carboxymethyl or 2-carboxyethyl, or two R3 radicals of an acetal/thioacetal group together are C2-C4 alkylene.