Patent ID: 6514407
Filing Date: 2003-02-04
Classification: C07B,C08B,Y02P

Abstract:
A derivative of chlorosilane, hydroxysilane or alkoxysilane type of polysaccharides or oligosaccharides, constituted by linear, branched or cyclic linkages of osidic chiral units and represented by one of the following formulae (Ia) to (Ik): in which:a) the symbols X1, X2 and X3, identical or different, each represent an oxygen atom or the â€”NH group; b) each of the symbols R1, R2 and R3 independently represents: a chiorosilane, hydroxysilane or alkoxysilane radical of general formula [(X)3Siâ€”Wâ€”CH2CH2]m Aâ€”Yâ€”(II) in which m is a non-zero integer at most equal to 5, Y is a single bond, an â€”NHâ€”COâ€”group, an â€”NHâ€”CSâ€”group or a â€”COâ€”group, A represents: (i) arylene radicals having 6 to 18 carbon atoms or an aralkylene radical having 7 to 40 carbon atoms, substituted by one or more atoms or radicals, identical or different, chosen from halogen atoms, alkyl radicals containing from 1 to 4 carbon atoms, alkoxy radicals containing from 1 to 4 carbon atoms, and nitro groups, (ii) arylene radicals having at least 2 aromatic rings linked by a divalent atom or group; (iii) aralkylene radicals having 7 to 40 carbon atoms; and (iv) alkylene-aryl radicals, optionally containing divalent heteroatoms or groups; W represents a single bond or the â€”CH2â€”CH2â€”CH2â€”Sâ€”group and X represents a halogen, a hydroxyl or an alkoxy; or a radical having the formula A2â€”A1 â€”CX4â€”(III) in which X4 represents an oxygen or sulphur atom, A1 represents a single bond or an â€”NHâ€”group and A2 represents an aryl radical having from 6 to 24 carbon atoms, an aralkyl radical having from 7 to 36 carbon atoms or an alkylaryl radical having from 7 to 18 carbon atoms; or a hydrogen atom or an NO2 group, n being an integer between 5 and 20 000, it being understood that, in each osidic chiral unit (Ia) to (Ik), at least one of the symbols X1, X2 and X3 represents an oxygen atom, and that, in at least one part of the structural units contituting the polysaccharide, at least one of the symbols R1, R2 and R3 represents a radical of general formula (II) and at least one of the symbols R1, R2 and R3 represents a radical of general formula (III).