公开(公告)号：DE3021146A1

公开(公告)日：1980-12-18

申请号：DE3021146

申请日：1980-06-04

Applicant: SNIA VISCOSA

Inventor： LEONI ROBERTO ,  BALDINI ALBERTO ,  CALLONI ANGELO ,  ANGELINI GIANFRANCO ,  BUSCATE MAILAND

IPC: C08B15/00 ,  C08B1/00

Abstract: A process for the preparation of high concentration solutions of cellulose derivatives in organic solvents comprises contacting with paraformaldehyde and the solvent a cellulose which has a polymerization degree lower than 300 and preferably not significantly higher than 200. The solvent is selected from among dimethylformamide, dimethylacetamide and N-methylpyrrolidone.

公开(公告)号：DE3015565A1

公开(公告)日：1980-11-06

申请号：DE3015565

申请日：1980-04-23

Applicant: SNIA VISCOSA

Inventor： LEONI ROBERTO ,  BALDINI ALBERTO ,  CALLONI ANGELO ,  ANGELINI GIANFRANCO ,  BUSCATE MAILAND

IPC: C08B16/00 ,  D01F2/00 ,  D01F13/02 ,  C08J11/04

Abstract: A process for the preparation of regenerated cellulose shaped bodies from spinning dopes comprising solutions of methylol derivatives of cellulose in organic solvent selected from dimethylformamide, dimethylacetamide, dimethylsulphoxide and N-methyl-pyrrolidone is described. The cellulose derivative is coagulated from the spinning dope in a coagulating bath, the main component of which is a high-boiling alcohol capable of reacting with the free (para)formaldehyde and with the bound (para)formaldehyde of the methylol derivative to a degree varying with the temperature. It is possible to prepare filaments and yarns having excellent characteristics by starting from solutions having high CH2O and cellulose concentrations and high MS ratios.