Graft polyvinyl acetals having acetal groups from etherified omega -hydroxy(poly)alkoxyalkanals, processes for their preparation and their use

摘要

Graft polyvinyl acetals having acetal groups from etherified omega -hydroxy(poly)alkoxyalkanals, processes for their preparation and their use Polymeric acetals of polyvinyl alcohols grafted onto polyalkylene oxide graft bases or onto polyurethane graft bases, which contain acetal groups from etherified omega -hydroxy(poly)alkoxyalkanals of the formula (I), and processes for their preparation by acetalization of corresponding graft polyvinyl alcohols are described. The polymeric acetals according to the invention are polymers which are plasticized internally and in general obtainable in solid form and which can be processed to films, shaped articles or coatings by thermoplastic methods without external plasticizers. Mixed acetals with other aldehydes can also be prepared and allow wide variants in the properties, inter alia the solubilities in water or in organic solvents. The polymeric acetals according to the invention can be processed or used in bulk, for example from the melt, or as organic or aqueous solutions or as aqueous dispersions.