ABSTRACT
The synergistic compositions of stabilizers are highly efficient, but they have a number of drawbacks in regard to the selection of stabilizers indifferent to one another, which limits the number used and availability of optimal relations. Drawbacks differences in physico-chemical characteristics-volatility, compatibility with polyolefins-that upsets the optimal relations and, as a result, reduces their efficiency; occasional chemical interactions in the course of processing and service. Stabilizers with intramolecular synergism capable of inhibiting the thermal oxidative breakdown of polyolefins do not have these drawbacks. Such stabilizers simplify considerably the introduction method; they are of high economic efficiency as they render the production of several different stabilizers unnecessary. Moreover, such stabilizers are known to exert a constant stabilizing action over time. In studying stabilizers with intramolecular synergism we have investigated polyamine disulfides produced by the condensation reaction of sulfur monochloride with a number of aromatic amines and diamines. They are highmolecular or oligomeric compounds, and therefore are compatible with polyolefins; they are low-volatile and heat-proof in air at 220-25o•c; they have paramagnetic centers with a concentration 1016-IQ-2° spin/g.
