Patent ID: 8465780

Claim:
A method for making a borate microemulsion, the method comprising the steps of: mixing one part, by weight, acidic borate with from about 0.6 to about 1.4 parts, by weight, alkali borate and from about 1.5 to about 3 parts, by weight, water to form a first mixture; reacting the first mixture at a temperature of from about 32° F. to about 212° F. to provide a first reaction product which comprises emulsified sodium pentaborate; and mixing the first reaction product with an additional from about 0.5 to about 4 parts, by weight, acidic borate and from about 0.5 to about 2 parts, by weight, water to provide a second product which comprises emulsified sodium pentaborate and particulate boric acid suspended therein wherein the acidic borate comprises a borate selected from the group consisting of orthoboric acid, metaboric acid, boric oxide, and mixtures thereof and wherein the alkali borate comprises at least a sodium borate.