METHOD FOR PREPARING A CELLULOSE FORMATE SOLUTION BY IMPREGNATING AND KNEADING CELLULOSE SLABS

摘要

A method for preparing a cellulose formate solution from cellulose slabs, particularly high-density slabs, without mechanically destroying said slabs in advance, is disclosed. The slabs are directly dissolved by impregnating the whole slabs in a formic acid-based liquid and kneading the resulting impregnated slabs in the presence of both formic acid and phosphoric acid. The method is preferably used to prepare ready-to-spin solutions, optionally and particularly together with an intermediate adjustment of the final composition. Solutions prepared by said method, cellulose objects made from such solutions, particularly fibres or films, assemblies of such fibres or films, and articles reinforced with such fibres, films or assemblies, said articles being, in particular, tyre treads, are also disclosed.