United States Patent
US Patent 4063883: Manufacture of flame-retardant regenerated…
US 4063883 · granted 1977-12-20
| Patent Number | 4063883 |
|---|---|
| Title | Manufacture of flame-retardant regenerated cellulose fibres |
| Filed | 1975-08-14 |
| Granted | 1977-12-20 |
| Inventor(s) | Johann Hupfl, Manfred Czermak, Helmut Teichmann, Josef Paul, Hoechst AG |
| Assignee | Chemiefaser Lenzing AG |
| CPC Classification | D06M15/00, D06M15/37, D06M15/19 |
| Number of Claims | 1 |
Abstract
Manufacture of flame-retardant regenerated cellulose fibres by adding one or more flame-retardant phosphorus comounds to viscose, extruding the viscose-containing mixture thus obtained into a spinning bath, stretching and after treating the resulting filaments or staple fibres. The flame-retardant fibres are made by using as the flame-retardant agent a combination of compounds of the general formula:
Claims Summary
1. In the process for making flame-retardant regenerated cellulose fibers by adding flame-retardant phosphorus compounds to viscose, extruding the viscose-containing mixture so obtained into a spinning bath, stretching and after-treating the resulting filaments or staple fibers, the improvement comprising adding as the flame-retardant a combination of triphosphorus pentanitride (component A) with a compound selected from the group consisting of diethylphosphatoethylmethacrylate and N-(oxymethyl)-3-(diethylphosphono)-propionamide (component B), the amount of component A compound being 4-17 weight % and the amount of component B compound being 1-5 weight %, the percentages being based on the quantity of cellulose used.