A method for the production of artificial lightweight structures, in particular artificial lightweight threads of viscose solutions

摘要

274,690. Lilienfeld, L. Jan. 11, 1926. Addition to 274,521. Cellulose xanthates, processes for making filaments from.-Artificial threads of high dry tenacity are obtained from viscose by using a setting bath in which the sulphuric acid of the parent Specification is substituted in part or whole hy a concentrated solution of another mineral acid, for instance, 25-40 per cent hydrochloric acid, 60-90 per cent nitric acid, phosphoric acid of 1.5-1.86 specific gravity, and 60-90 per cent arsenic acid, or in fact any mineral acid solution which has an hydrogenion. concentration not less than that of a setting bath comprising a solution of sulphuric acid, containing at least 55 per cent by weight of acid, as described in the parent Specification.