Patent ID: 8691168

Claim:
A process for preparing a solution of electrically uncharged [(OH) x (NH 3 ) y Zn] z where x, y and z are each independently 0.01 to 10, the process comprising: (A) contacting ZnO, Zn(OH) 2 , or both, with ammonia in at least one solvent, to obtain a first solution, having a concentration cl, of electrically uncharged [(OH) x (NH 3 ) y Zn] z where x, y and z are each independently 0.01 to 10, (B) removing some of the solvent from the solution obtained in (A), to obtain a suspension comprising Zn(OH) 2 , (C) removing solid Zn(OH) 2 from the suspension obtained in (B), (D) contacting the Zn(OH) 2 from (C) with ammonia in at least one solvent, to obtain a second solution, having a concentration c2, of electrically uncharged [(OH) x (NH 3 ) y Zn] z where x, y and z are each independently 0.01 to 10.