Patent ID: 6630566
Filing Date: 2003-10-07
Classification: C08G,G03G,Y10S

Abstract:
A polymeric material comprising at least one repeat unit, the or each (if more than one) repeat unit consisting substantially of a moiety of Formula I: in which:Y1 represents, independently if in different repeat units, N, P, S, As and/or Se; Ar1 and Ar2 which may be the same or different, represent, independently if in different repeat units, a multivalent aromatic group optionally substituted by at least one optionally substituted C1-40carbyl-derived groups and/or at least one other optional substituent, and Ar3 represents, independently if in different repeat units, a mono or multivalent aromatic group optionally substituted by at least one; optionally substituted C1-40carbyl-derived group and/or at least one other optional substituent; except when Y1 is divalent S or divalent Se, Ar3 and the arrow therefrom are not present; the arrow from Ar3 indicates, in the case where Ar3 is monovalent, a bond to a terminal group inert to coupling in the polymerisation to form said polymeric material, or, in the case where Ar3 is multivalent, a bond to another said repeat unit; where at least one terminal group is attached in the polymer to the Ar1, Ar2 and optionally Ar3 groups located at the end of the polymer chains, so as to cap the polymer chains and prevent further polymer growth, and at least one terminal group is derived from at least one end capping reagent used in the polymerisation to form said polymeric material to control the molecular weight thereof.