Preparation of polyethylene

   
   

Ethylene homopolymers and copolymers are prepared in a tube reactor at from 160.degree. C. to 350.degree. C. and pressures in the range from 500 to 5000 bar, with or without use of molar mass regulators, using a peroxide mixture comprising from 1 to 95 mol %, based on the total amount of the peroxide mixture, of at least one cyclic peroxide of the formula I, ##STR1## where the radicals R are identical or different and are selected from among alkyl groups and aryl groups, as polymerization initiator.

Os homopolymers e os copolymers do etileno são preparados em um reator do tubo de 160.degree. C. a 350.degree. C. e pressões na escala de 500 à barra 5000, com ou sem uso de reguladores maciços molar, usando uma mistura do peroxide que compreende 1 a 95 mol de %, baseados na quantidade total da mistura do peroxide, ao menos de um peroxide cíclico da fórmula I, ## do ## STR1 onde os radicais R são idênticos ou diferentes e são selecionados entre dos grupos alkyl e dos grupos aryl, como o iniciador da polimerização.

 
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