Verfahren zur Herstellung von Vinylalkohol-Polymerzusammensetzungen

摘要

The first step of simultaneously effecting, in a reaction liquid comprising a solution containing a vinyl carboxylate polymer and, added to the solution, a first metal alkoxide (I) and/or an oligomer (I) derived from the metal alkoxide (I), saponification of said vinyl carboxylate polymer and reaction in which at least part of the functional groups contained in said metal alkoxide (I) and/or oligomer (I) participates, to obtain a vinyl alcohol polymer composition (I); and the second step of preparing a solution (A) containing the vinyl alcohol polymer composition (I) obtained in the first step, adding to the solution (A) a second metal alkoxide (II) and/or an oligomer (II) derived from the metal alkoxide (II) or another solution (B) containing the metal alkoxide (II) and/or the oligomer (II) derived from the metal alkoxide (II), to prepare an intermediate product solution (C), and then removing the solvent from the obtained solution (C), to produce a vinyl alcohol polymer composition (II). The vinyl alcohol polymer compositions obtained by the above process have excellent gas-barrier properties.