METHOD OF PRODUCING STABILISED COMPOSITIONS BASED ON LOW-PRESSURE POLYETHYLENE WITH HIGH CRACKING RESISTANCE Russian patent published in 2013 - IPC C08J3/22 C08L23/06 C08L23/08 C08K5/13 

FIELD: chemistry.

SUBSTANCE: invention relates to the technology of producing a stabilised composition based on low-pressure polyethylene which is meant for blow moulding and pressure casting articles. The method is realised by mixing, in a molten mixture, polyethylenes of different density and additives. The mixture of polyethylenes, taken in granular form, comprises high-density polyethylene and low-density linear polyethylene or high-density polyethylene and medium-density linear polyethylene. The additives are added the composition in form of an additive based on low-density linear polyethylene, which is obtained from a molten granular polymer concentrate. The additive contains a phenol antioxidant which is a sterically hindered phenol, and an ethylene and vinyl acetate copolymer which contains 9-16 wt % vinyl acetate, with the weight ratio of the low-density linear polyethylene to the ethylene and vinyl acetate copolymer ranging from 0.8:1 to 4.3:1. Content of the ethylene and vinyl acetate copolymer in the composition ranges from 0.5 to 1.5 wt % and content of the phenol antioxidant ranges from 0.05 to 0.15 wt %.

EFFECT: stabilised compositions obtained using the disclosed method have an optimum set of physical and mechanical properties and high cracking resistance.

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