Patent ID: 8246865
Filing Date: 2012-08-21
Classification: D01D,D01F

Abstract:
1. A process for manufacturing flame retardant viscose by adding silica to a viscose and subsequently fixing said silica to a fibre, said process consisting of a first phase in which said silica is prepared, a second phase of proportioning of said silica and an addition of said silica to a mass viscose, a third phase of regeneration of the viscose mixture, the fixing of a polysilica acid and finally a phase of washing of the fibre, characterized by the fact that during said third phase of regeneration of the viscose mixture, in which said viscose is coagulated in a spinning bath, zinc sulphate (SO 4 Zn) in said spinning bath is replaced with aluminum sulphate (Al 2 (SO 4 )3), while in said phase of washing of the fibre, said washing is performed through the use of hydrogen peroxide or oxygenated water (H 2 O 2 ) after a phase of bleaching with sodium hypochlorite (NaOCl).