After degraded by oxidation process, polyvinyl acetals, prepared from acetalation of PVA with aldehydes in aq. alcohol solution under acid conditions, can be directly used for adhesive and coating.

• 聚乙烯醇（PVA）在乙醇水溶液中在酸性条件下与醛类缩醛化制成PVA缩醛的乙醇水溶液。