Patent ID: 8128804

Claim:
A process for stabilizing olefinically unsaturated monomers, comprising: adding a retarder-containing composition (AB) to (i) an olefinically unsaturated monomer, or (ii) a monomer mixture which comprises at least one olefinically unsaturated monomer; wherein said retarder-containing composition (AB) comprises (A) a solvent which is a saturated or unsaturated, branched and/or unbranched, ring-closed and/or open-chain aliphatic or aromatic hydrocarbon, ether or ester, each of which has 4 to 20 carbon atoms, or methanol, and (B) at least one retarder of the formula (II) wherein X=halogen, —O—R 3 or —S—R 3 , R 1 , R 2 and R 3 =hydrogen, alkyl having 1 to 15 carbon atoms, cycloalkyl having 3 to 15 carbon atoms or aryl group having 6 to 14 carbon atoms, wherein the substituents R 1 , R 2 and R 3 are the same or different and are substituted or unsubstituted.