Patent ID: 6812291
Filing Date: 2004-11-02
Classification: C08F

Abstract:
A process for preparing block polymers of general formula (IA) or (IB): in which formulae:R1 represents: an optionally substituted alkyl, acyl, aryl, alkene or alkyne group (i), an optionally substituted or aromatic, saturated or unsaturated, carbocycle (ii), or an optionally substituted or aromatic, saturated or unsaturated, heterocycle (iii), optionally, these groups and rings (i), (ii) and (iii) are substituted with substituted phenyl groups, substituted aromatic groups, or groups: alkoxycarbonyl or aryloxycarbonyl (â€”COOR), carboxyl (â€”COOH), acyloxy (â€”O2CR), carbamoyl (â€”CONR2), cyano (â€”CN), alkylcarbonyl, alkylarylcarbonyl, arylcarbonyl, arylalkylcarbonyl, phthalimido, maleimido, succinimido, amidino, guanidimo, hydroxyl (â€”OH), amino (â€”NR2), halogen, allyl, epoxy, alkoxy (â€”OR), S-alkyl, S-aryl, organosilyl, groups having a hydrophilic or ionic character, R representing an alkyl or aryl group, Z is an optionally substituted ring comprising a nitrogen atom via which Z is linked to the C(&boxH;S)â€”S-group of formula (IA), the other atoms of said ring inducing a delocalizing or electron-withdrawing effect with respect to the electron density of the nitrogen atom, R2 and R3, which are identical or different, represent: an optionally substituted alkyl, acyl, aryl, alkene or alkyne group (i), an optionally substituted or aromatic, saturated or unsaturated, carbocycle (ii), or an optionally substituted, saturated or unsaturated, heterocycle (iii), optionally, these groups and rings (i), (ii) and (iii) are substituted with: substituted phenyl groups or substituted aromatic groups, groups: alkoxycarbonyl or aryloxycarbonyl (â€”COOR), carboxyl:(â€”COOH), acyloxy (â€”O2CR), carbamoyl (â€”CONR2), cyano (â€”CN), alkylcarbonyl, alkylarylcarbonyl, arylcarbonyl, arylalkylcarbonyl, phthalimido, maleimido, succinimido, amidino, guanidimo, hydroxyl (â€”OH), amino (â€”NR2), halogen, allyl, epoxy, alkoxy (â€”OR), S-alkyl, S-aryl, groups having a hydrophilic or ionic character, R representing an alkyl or aryl group, and, for at least R2 or R3, these groups and rings (i), (ii) and (iii) induce a delocalizing or electron-withdrawing effect with respect to the electron density of the nitrogen atom to which R2 and R3 are linked, V, Vâ€², W and Wâ€², which are identical or different, represent: H, an alkyl group or a halogen, X, Xâ€², Y and Yâ€², which are identical or different, represent H, a halogen, a group Râ€², ORâ€², OCORâ€², NHCOH, OH, NH2, NHRâ€², N(Râ€²)2, (Râ€²)2N+Oâˆ’, NHCORâ€², CO2H, CO2Râ€², CN, CONH2, CONHRâ€²or CONRâ€²2, wherein Râ€² is alkyl, aryl, aralkyl, alkaryl, alkene or organosilyl groups, optionally perfluorinated and optionally substituted with one or more carboxyl, epoxy, hydroxyl, alkoxy, amino, halogen or sulphonic groups, a and b, which are identical or different, are equal to 0 or 1, m and n, which are identical or different, are greater than 1, the individual repeat units being identical or different, said process comprising the step of bringing into contact with each other:an ethylenically unsaturated monomer of formula: CYYâ€²(&boxH;CWâ€”CWâ€²)a&boxH;CH2, a precursor compound of general formula (IIA) or (IIB): â€ƒwherein Z, X, Xâ€², V, Vâ€², R1, R2 and R3 have the same meaning, and b and n the same value, as previously; and a radical polymerization initiator compound, and wherein said block polymers have a polydispersity index of at most 1.5.