Patent ID: 8142857

Claim:
A method for producing a compound comprising the following steps: mixing polycaprolactone, dimethylol propionic acid, 4,4′-methylenebis (cyclohexyl isocyanate) and dibutyltin dilaurate with a weight ratio in a solvent to form a first solution; mixing the first solution with a triethylamine solution to form a second solution; mixing the second solution with deionized water to form a second aqueous solution; mixing the second aqueous solution with a triethylene tetramine solution to form a third solution; filtering the third solution in a pressure-reducing environment to obtain a waterborne polyurethane solution, and the terminal of the waterborne polyurethane comprising an amino group; and mixing the waterborne polyurethane solution with tetraethylorthosilicate to form a fourth solution; which contains the compound.