Patent ID: 7226639
Filing Date: 2007-06-05
Classification: D01F

Abstract:
1. A method comprising continuously or batchwise obtaining fibrous carbon materials by carbonization of cellulosic fibrous materials in the presence of at least one organosilicon compound, wherein said organosilicon compound is chosen from a family of crosslinked, cyclic or branched oligomers and resins having a number-average molecular mass of between 500 and 10,000 and consisting of units of formula SiO 4 and units of formula SiO x R y (OR′) z , x, y and z being integers such that x+y+z=4 and 1x≦3, 0≦y≦3 and 0≦z≦3, R representing hydrogen, or a linear or branched alkyl radical having from 1 to 10 carbon atoms, different R groups being capable of occurring in the same unit when y≧2, R′ representing, independently of R, hydrogen, or a linear or branched alkyl radical having from 1 to 10 carbon atoms, different R′ groups being capable of occurring in the same unit when z≧2 given that for oligomers having a number-average molecular mass of less than 1,000, z≠0 in said formula SiO x R y (OR′) z and for resins having a number-average molecular mass of more than 2,000, y≠0 in said formula SiO x R y (OR′) z ; subjecting said cellulosic fibrous materials to said carbonization so as to provide said fibrous carbon materials with filaments of increased strength compared to filaments from said carbonization performed in the absence of said organosilicon compound.