Patent ID: 6362274
Filing Date: 2002-03-26
Classification: C08F,C09D

Abstract:
A grafted copolymer comprising:a principal chain onto which are directly grafted at least two side chains, the grafted copolymer further comprising: at least three sequences of distinct chemical nature, wherein a first sequence of the at least three sequence of distinct chemical nature is a sequence for anchoring onto solid particles, a second sequence of the at least three sequences of distinct chemical nature is a sequence of hydrophobic character, and a third sequence of the at least three sequences of distinct chemical nature is a sequence of hydrophilic character; wherein one of the at least three sequences of distinct chemical nature forms said principal chain and the other two of the at least three sequences of distinct chemical nature form said side chains; the grafted copolymer further comprising: 1 to 80% by mass of the sequence for anchoring onto solid particles consisting of an anchoring straight hydrocarbon chain, cycloalkyl or aromatic, comprising basic nitrogenous groups selected from the groups consisting of: heterocyclic, â€”NH2, â€”NHâ€”, â€”NHR, â€”NR2, â€”CONH2, â€”CONHR, and â€”CONR2 where R is an alkyl radical (C1-C6) that may be substituted by one or more groups selected from the groups consisting of: â€”OH, â€”COOâ€”, â€”COâ€”, â€”Oâ€”, and â€”SO3H, wherein the anchoring chain may comprise groups â€”COOâ€”, and has a molar mass included between 150 and 10000, wherein the percent by mass of basic nitrogenous monomers in the anchoring chain is 30% minimum, and at least 10% by mass of the sequence of hydrophobic character consisting of an hydrophobic straight hydrocarbon chain, cycloalkyl or aromatic, which may comprise groups selected from the groups consisting of â€”COOâ€”, â€”Sâ€”, â€”F, and â€”Si(ORâ€²)n(Râ€³)2âˆ’nâ€” where Râ€² and Râ€³ represent (C1-C10) alkyl or (C1-C10) aryl radicals, and n=0 to 2, wherein the hydrophobic chain is formed by monomer units having a parameter of solubility less than or equal to 21.5 JÂ½/cm{fraction (3/2)}, and wherein the hydrophobic chain has a molar mass included between 250 and 10000, and at least 10 to 90% by mass of the sequence of hydrophilic character consisting of an hydrophilic straight hydrocarbon chain comprising groups selected from the groups consisting of â€”Oâ€”, â€”OH, â€”COOâ€”, â€”COOHâ€”, â€”Sâ€”, and â€”SO3H, wherein the hydrophilic chain is formed by monomer units having a parameter of solubility greater than 22 JÂ½/cm{fraction (3/2)}, and wherein the hydrocarbon chain has a molar mass included between 250 and 10000.