POLYOLEFINS AND METHOD FOR THEIR PREPARING Russian patent published in 2005 - IPC

FIELD: organic chemistry, polymers.

SUBSTANCE: invention relates to a method for preparing polyolefins eliciting improved rheological and compatibility properties, and to olefins synthesized by indicated method and their applying also. Method for preparing polyolefins involves: a) grafting stage of acid groups to polyolefins using a grafting monomer comprising at least one functional group taken among carbonyl and acid anhydride residue and if necessary in the presence of another grafting monomer comprising vinyl-unsaturated bond and, possibly, one or some aromatic rings; b) purification stage involving removal of at least part of grafting monomer unreacted with polyolefins and comprising at least one functional group taken among carbonyl and acid anhydride residue; c) stage for neutralization of acid groups using at least one neutralizing agent. Neutralization is carried out with zinc acetate to obtain polyolefins characterizing by the presence of ionic clusters containing ions Zn²⁺. Also, invention relates to polyolefins obtained by indicated method, to their applying and to a method for extrusion of polyolefins by foaming. Method provides preparing polyolefins eliciting the enhanced stability in melted state and characterizing exponential elevating viscosity value at elongation depending on time and elevating dynamic viscosity at low shift frequencies.

EFFECT: improved preparing method.

22 cl, 3 dwg, 1 ex