Patent ID: 6998465

Claim:
A process for producing a boric acid ester compound which comprises esterifying a compound represented by the formula (1): X—[O(AO) n —H] a (1) wherein X represents a group selected from a residue of a compound having 1 to 8 hydroxyl groups, an acryloyl group and a methacryloyl group, AO represents an oxyalkylene group having 2 to 4 carbon atoms, n is 1 to 600, a is 1 to 6, and n×a is 1 to 600 with a boron-containing compound represented by the formula (2): (RO) 3 —B (2) wherein R represents an alkyl group having 1 to 4 carbon atoms, while distilling the boron-containing compound represented by the formula (2) and an alcohol represented by the formula (3) and produced by said reaction: ROH (3) wherein R represents an alkyl group having 1 to 4 carbon atoms.