Patent ID: 7754640

Claim:
A magnesium composition, comprising a compound represented by the formula (I): Mg(OC 2 H 5 ) 2−n (OR 1 ) n (I) where n is a numerical value satisfying 0<n<0.35, R 1 is C m H 2m+1 , and m is an integer of from 3 to 10; wherein: the composition has a particle diameter D 50 corresponding to 50% of a cumulative weight fraction of from 4 to 20 μm; the composition has a particle size distribution index (P) of less than 4.0, where P is given by the formula (1): P =( D 90 /D 10 ) (1) where D 90 is a particle diameter corresponding to 90% of cumulative weight fraction, and D 10 is a particle diameter corresponding to 10% of cumulative weight fraction; and the composition is obtained by reacting metal magnesium, ethanol, an alcohol having from 3 to 10 carbon atoms, and at least one of a halogen and a halogen-containing compound at a temperature of from 0 to 70° C., the at least one of the halogen and the halogen-containing compound providing at least 0.0001 gram atoms of the halogen relative to one gram atom of the metal magnesium.