Patent ID: 6388796
Filing Date: 2002-05-14
Classification: C07D,G02F

Abstract:
An electrochromic device comprising(a) a pair of glass or plastic plates or plastic films wherein at least one such plate or film is provided on one side each with an electrically conductive coating, wherein (1) at least one such plate or film and its conductive coating is transparent, (2) the other such plate or film and its conductive coating is optionally mirrored, (3) the electrically conductive layer of one or both of the two plates or films is optionally divided into separate segments optionally provided with individual contacts, and (4) the plates or films are joined on the sides of their conductive coating by means of a sealing ring to form a volume; and (b) the volume formed by the two plates or films and the sealing ring is filled with an electrochromic medium comprising a pair of electrochromic substances OX2 and RED1, wherein (1) OX2 is a reducible electrochromic substance, and (2) RED1 is an oxidizable electrochromic substance represented by at least one of the formulas â€ƒwherein R201 is aryl, R202 is alkyl, cycloalkyl, alkenyl, aralkyl, or aryl, B is a bivalent bridge, m and n, independently of one another, are integers from 1 to 4, and R203 to R206, independently of one another, are hydrogen, halogen, alkyl, alkoxy, cyano or aryl, with the provisos that when m is at least 2, two adjacent R203 together also optionally represent a bivalent â€”CH&boxH;CHâ€”CH&boxH;CHâ€” radical and when n is at least 2, two adjacent R204 together also optionally represent a bivalent â€”CH&boxH;CHâ€”CH&boxH;CHâ€” radical.