Polyvinyl alcohol film with delayed aqueous dissolution, process for its manufacture and its applications.

摘要

Polyvinyl alcohol film with delayed aqueous dissolution, obtained from saponified polyvinyl alcohol resin. According to the invention this film is characterised in that its thickness is chosen between 30 and 100 mu and in that the base polyvinyl alcohol resin contains a proportion of between 0.2 and 0.7 % by weight of unsaponified residual vinyl acetate.