| 摘要 |
A polyvinyl alcohol (PVA) composition (I) in the form of an aqueous solution containing (a) PVA, (b) at least one poly-aldehyde with at least 3 carbon atoms, completely masked as a water-soluble hydrogen-sulphite adduct and (c) at least one compound with an acid reaction in water. Also claimed are (i) processes for the production of (I), (ii) a homogeneous, solid, water-soluble PVA pre-mix containing components (a) and (b), and (iii) a process for the production of this pre-mix by mixing water-soluble PVA granules with an aqueous solution of component (b) and then drying the mixture. |
