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
One or more concentrated low-viscosity solutions of alkaline earth alkoxide compounds M(OCH 2 R 6 ) 2-a-b (OR 7 ) a [O(CHR 8 ) n OR 9 ] b in mixture with a metal alkyl compound M(R 10 R 11 ) in an aprotic solvent and related methods are disclosed herein.
1. A solution of alkaline earth alkoxide compounds M(OCH 2 R 6 ) 2-a-b (OR 7 ) a [O(CHR) n OR 9 ] b in mixture with an alkaline earth metal alkyl compound M(R 10 R 11 ) with an alkaline earth metal concentration in the range of 0.2 to 1.8 mmol/g in an aprotic solvent, wherein
M is an alkaline earth metal selected from the group consisting of Mg, Ca, Ba, and Sr;
OCH 2 R 6 is an alkoxide radical consisting of at least 3 and at most 40 carbon atoms with a branch in position 2 relative to the O function;
R 7 is an alkyl radical with 2-15 carbon atoms, which is either linear or has a branch in ≥position 3 relative to the O function;
R 8 is an alkyl radical with 1 to 6 carbon atoms, which is either linear or has a branch at ≥position 3 (relative to the O function;
R 9 is an alkyl radical with 2 to 15 carbon atoms, which is either linear or has a branch;
R 10 and R 11 are any alkyl radicals with 1 to 15 carbon atoms;
n is an integer from 1 to 4;
a+b≤2 wherein a and b each have a value of 0 to 2; and
the solution has a molar ratio of M(OCH 2 R 6 ) 2-a-b (OR 7 ) a [O(CHR 8 ) n OR 9 ] b to M(R 10 R 11 ) that is in the range of from 99.5:0.5 to 60:40.
2. The solution according to claim 1 , characterized in that the alkaline earth metal concentration is in the range of 0.4 to 1.6 mmol/g.
3. The solution according to claim 1 , characterized in that the solution, at the alkaline earth metal concentration of ≥1 mmol/g to ≤1.6 mmol/g, has a viscosity, measured at room temperature, of ≤300 cP.
4. The solution according to claim 1 , characterized in that the molar ratio of M(OCH 2 R) 2-a-b (OR 7 ) n [O(CHR 8 ) n OR 9 ] b to M(R 10 R 11 ) is in the range of from 99:1 to 70:30.
5. The solution according to claim 1 , characterized in that it contains from 0.1 to 30 mol % M(R 10 R 11 ), determined by direct titration with sec-butanol and biquinoline as the indicator and based on the total alkaline earth metal M in solution and the solution non-pyrophoric according to one selected from the group consisting of United Nations test N.2, United Nations test N.3, and both United Nations test N.2 and United Nations test N.3.
6. The solution according to claim 1 , characterized in that the alkaline earth metal concentration is in the range of 0.7 to 1.4 mmol/g.
7. The solution according to claim 1 , characterized in that the solution, at the alkaline earth metal concentration of >1 mmol/g to <1.6 mmol/g, has a viscosity, measured at room temperature, of <100 cP.
8. The solution according to claim 1 , characterized in that the molar ratio of M(OCH 2 R 6 ) 2-a-b (OR 7 ) a [O(CHR 8 ) n OR 9 ] b to M(R 10 R 11 ) is in the range of from 95:5 to 80:20.
9. A method for synthesis of alkaline earth alkoxide compounds M(OCH 2 R 6 ) 2-a-b (OR 7 ) a [O(CHR 8 ) n OR 9 ] b in mixture with a metal alkyl compound M(R 10 R 11 ) according to claim 1 , the method comprising:
mixing a solution of the metal alkyl compound M(R 10 R 11 ) in an aprotic solvent with one or more alcohols selected from the group of HOCH 2 R 6 , HOR 7 , HO(CHR 8 ) n OR 9 , and any mixture thereof, wherein half of the molar ratio of the total number of moles of all alcohols to the metal alkyl compound is from 99.5:0.5 to 60:40.