GAS BARRIER POLYURETHANE RESIN AND GAS BARRIER FILM CONTAINING THE SAME

摘要

PROBLEM TO BE SOLVED: To provide polyurethane resins having extremely good gas barrier properties against water vapor, oxygen, aroma components or the like, and films containing the same. SOLUTION: A diisocyanate component of an aromatic diisocyanate and the like is reacted with a diol component of a 2-8C alkylene glycol and the like to prepare a polyurethane resin having a sum of the concentrations of urethane groups and urea groups of not less than 15 wt.%. The repeating constituting units of the polyurethane resin may contain constituting units of an aromatic or alicyclic compound. The polyurethane resin may be filmed into either a gas barrier film or a gas barrier composite film having a substrate film layer and a layer containing at least the polyurethane resin.