Patent ID: 7312282
Filing Date: 2007-12-25
Classification: C08F,C08G,C08L,Y10S

Abstract:
1. A process for preparing a block copolymer, comprising: preparing at least one first polysulfone homoblock having a molecular weight of at least 1000, comprising heating at least one first aromatic diol compound with at least one first aromatic dihalo compound in the presence of at least one alkali, wherein at least one of the first aromatic diol compound and the first aromatic dihalo compound comprises at least one sulfone group, the first polysulfone homoblock comprising two first end groups; preparing at least one second polysulfone homoblock having a molecular weight of at least 1000, comprising heating at least one second aromatic diol compound with at least one second aromatic dihalo compound in the presence of at least one alkali, wherein at least one of the second aromatic diol compound and the aromatic dihalo compound comprises at least one sulfone group, the second polysulfone homoblock comprising two second end groups; reacting the at least one first polysulfone homoblock and the at least one second polysulfone homoblock to produce a reaction mass comprising the block copolymer having a molecular weight of at least 2000; and recovering the block copolymer from the reaction mass, wherein each of the two first end groups and the two second end groups comprises two end groups that are different from each other.