Low-viscosity solutions of alkaline-earth metal alkoxides in aprotic solvents, method for the production of same and use for the production of ziegler-natta catalysts

A method for synthesis of alkaline earth alkoxide compounds M(OCH2R6)2-a-b(OR7)a[O(CHR8)nOR9]b in mixture with an alkaline earth metal alkyl compound M(R10R11), the method comprising

• (A) mixing one or more alkaline earth metals, an aprotic solvent, one or more alkyl aluminum compounds, and one or more alcohols at a temperature in the range of 0° C. and 180° C. to produce a mixture comprising the alkaline earth alkoxide compounds M(OCH2R6)2-a-b(OR7)a[O(CHR8)nOR9]b;
• wherein:
• (i) M is an alkaline earth metal selected from the group consisting of Mg, Ca, Ba, and Sr;
• (ii) OCH2R6 is an alkoxide radical having 3 to 40 carbon atoms with a branch in position 2 relative to the O function;
• (iii) R7 is an alkyl radical having 2 to 15 carbon atoms, which is either linear or has a branch in ≥position 3 relative to the O function;
• (iv) R8 is an alkyl radical having 1 to 6 carbon atoms, which is either linear or has a branch at ≥position 3 relative to the O function;
• (v) R9 is an alkyl radical having 2 to 15 carbon atoms, which is either linear or has a branch;
• (vi) R10 and R11 each are an alkyl radical having 1 to 15 carbon atoms;
• (vii) n is an integer from 1 to 4;
• (viii) a+b≤2 wherein a and b each have a value of 0 to 2;
• and
• (B) adding one or more alkaline metal alkyl compounds M(R10R11) to the mixture comprising the alkaline earth alkoxide compounds M(OCH2R6)2-a-b(OR7)a[O(CHR8)nOR9]b, wherein the molar ratio of M(OCH2R6)2-a-b(OR7)a[O(CHR8)nOR9]b to M(R10R11) is from 99.5:0.5 to 60:40.