IMPROVED SOLID COMPONENT OF CATALYST FOR THE (CO) POLYMERIZATION OF ETHYLENE AND PROCESS FOR ITS USE

CATALYST AND SOLID COMPONENT OF CATALYST FOR THE (CO) POLYMERIZATION OF ETHYLENE, COMPRISING TITANIUM,MAGNESIUM,CHLORINE,A PROTIC ORGANO-OXYGENATED COMPOUND DP AND A NEUTRAL APROTIC ELECTRON-DONOR COMPOUND D, IN THE FOLLOWING MOLAR RANGES:@MG/TI = 1.0-50; D/TI = 1.0-15;@C1/TI = 6.0-100; DP/D= 0.05-3;@AND A PROCESS FOR OBTAINING SAID COMPONENT COMPRISING THE FOLLOWING STEPS IN SUCCESSION:@(A) FORMATION OF A MIXTURE AND DISSOLUTION, IN SAID ELECTRON-DONOR APROTIC COMPOUND D,OF A MAGNESIUM CHLORIDE AND A TITANIUM COMPOUND HAVING FORMULA II):@ TIV (OR3)AX(V-1)(II)WHEREIN EACH R3 INDEPENDETLY REPRESENTS A HYDROCARBYL OR ACYL RADICAL HAVING FROM 1 TO 15 CARBON ATOMS;EACH X IS SELECTED FROM CHLORINE,BROMINE OR IODINE;@"V" HAS THE VALUE OF 3 OR 4, AND "A" IS A NUMBER VARYING FROM 0 TO "V",@WITH A MOLAR RATIO BETWEEN TITANIUM AND MAGNESIUM RANGING FROM 1/1 TO 50/1;@(B) PARTIAL SEPARATION OF THE COMPOUND D FROM SAID MIXTURE PREPARED IN STEP (A) UNTIL A RESIDUE IS OBTAINED, SOLID AT ROOM TEMPERATURE, WHEREIN THE D/TI RATIO RANGES FROM 1.5 TO 40,@(C) FORMATION OF A SUSPENSION OF SAID SOLID RESIDUE IN A LIQUID HYDROCARBON MEDIUM,@(D) ADDITION TO SAID SUSPENSION OF SAID ORGANO-OXYGENATED PROTIC COMPOUND DP, IN SUCH A QUANTITY THAT THE MOLAR RATIO PROTIC COMPOUND DP,/D RANGES FROM 0.1 TO 1.2 AND MAINTAINING THE MIXTURE UNTIL EQUILIBRIUM IS REACHED, TO FORM THE DESIRED SOLID COMPONENT OF CATALYST.