| 摘要 |
PURPOSE: A dimethylformamide elution accelerator of polyurethane resin capable of increasing the elution speed of dimethylformamide used for the solvent of polyurethane resin for silver layer is provided, which can reduce manufacturing time and improve productivity. CONSTITUTION: The dimethylformamide elution accelerator of polyurethane resin is prepared by reaction of polyol and methylene diphenyldiisocynate in an equivalent ratio of 1 : 0.94 to 1.20 and adding 1,4-butanediol and methylene diphenylisocyanate. The polyol uses one or more selected from the group consisting of polytetramethyleneglycol, polybutylene ethylene adifate diol, polyethylene adifate diol, silicon based polyol.
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