Patent ID: 7208131

Claim:
A process for the production of alkali metal-bis(chelato)borates of the formula M[BL 1 L 2 ] comprising mixing an oxidic alkali metal raw material with H 2 L 1 and H 2 L 2 with an oxidic boron compound, without the addition of an organic solvent, reacting the heterogeneous mixture and removing any water introduced with the raw materials and the water formed during the reaction; wherein M is selected from the group consisting of Li, Na, K, Rb and Cs; L 1 is selected from the group consisting of —OC(O)—(CR 1 R 2 ) n —C(O)O— and —OC(O)—(CR 3 R 4 )—O— and R 1 , R 2 , R 3 and R 4 independently selected from the group consisting of H, alkyl, aryl and silyl; L 2 is selected from the group consisting of —OC(O)—(CR 5 R 6 ) n —C(O)O— and —OC(O)—(CR 7 R 8 )—O— and R 5 , R 6 , R 7 , R 8 independently selected from the group consisting of H, alkyl, aryl and silyl; wherein n is 0 or 1; H 2 L 1 is selected from the group consisting of H—OC(O)—(CR 1 R 2 ) n —C(O)O—H and H—OC(O)—(CR 3 R 4 )—O—H; and H 2 L 2 is selected from the group consisting of H—OC(O)—(CR 5 R 6 ) n —C(O)O—H or H—OC(O)—(CR 7 R 8 )—O—H; wherein H 2 L 1 and H 2 L 2 are optionally the same.