Patent ID: 7041825

Claim:
An additive which is a reaction product of a 1,3,4-thiadiazole of formula (I): wherein X is hydrogen or a C 1 –C 20 alkyl group and a dithiocarbamic acid of formula (IIa): wherein R 1 and R 2 are independently a radical being either an alkyl, a cycloalkyl, an alkenyl, an aryl, an arylalkyl, or an alkylaryl, or R 1 and R 2 together form 3- to 8-membered heterocyclic ring structure which optionally contains an additional nitrogen or oxygen heteroatom and wherein the heterocyclic ring is optionally substituted with alkyl groups wherein the total number of carbon atoms from the heterocyclic ring alkyl groups is from 4 to 40, wherein the reaction product is produced by reacting the dithiocarbmanic acid of formula (IIa) with the 1,3,4-thiadiazole of formula (I) and the oxidizing agent is then added; or an isomer of said reaction product.