Patent ID: 6930815

Claim:
An electrochromic oligomer or polymer of the formulae . . . —(D) r . . . —(E—B 1 —Y) g — . . . —(F—B 2 —Z) h . . . (CL) and . . . —(D) r . . . —[E—(B 1 —Y) i —(B 2 —Z) j ] g —. . . (CLX), in which D, E and F are components of an oligomer or polymer chain, wherein the units D, E and F may be either randomly distributed or arranged in blocks, B 1 and B 2 are a bridging unit, Y and Z, independently of one another, are a radical OX 2 or RED 1 , wherein OX 2 is the radical of a reversibly electrochemically reducible redox system, and RED 1 is the radical of a reversibly electrochemically oxidizable redox system, each f, g and h, independently of one another, is an integer from 1 to 100,000, wherein f+g+h>2, and each f and h, independently of one another, is optionally 0, and each i and j, independently of one another, is an integer from 1 to 100.