Patent ID: 6825301
Filing Date: 2004-11-30
Classification: C08F

Abstract:
A process for preparing a water-in-oil polymer emulsion, said process comprising emulsifying, in an organic phase, at least one ethylenically unsaturated monomer, using a water-in-oil emulsifier and performing an emulsion polymerization;wherein said polymerization is performed in the presence of at least one initiator of formula wherein R1, R2, R3 and R4 each independently comprise: (i) linear or branched-alkyl group containing from 1 to 9 carbon atoms, wherein said -alkyl group is optionally substituted with at least one hydroxyl group, C1 to C6 alkoxy group, halogen group, or a combination thereof; (ii) C3 to C12-cycloalkyl group, wherein said -cycloalkyl group is optionally substituted with at least one C1 to C6 alkyl group, C1 to C6 alkoxy group, hydroxyl group, halo group, or a combination thereof; (iii) an -aralkyl group, wherein said -aralkyl group is optionally substituted with at least one C1 to C6 alkyl group, C1 to C6 alkoxy group, hydroxyl group, halo group, or a combination thereof; (iv) an -aryl group, wherein said -aryl group is optionally substituted with at least one C1 to C6 alkyl group, C1 to C6 alkoxy group, hydroxyl group, halo group, or a combination thereof; wherein, optionally, at least one combination of R1-R2 and/or R3-R4 form an aliphatic ring; and wherein Râ€³ and Râ€² independently comprise linear or branched C1 to C10 aliphatic radicals.