公开(公告)号：DE3376969D1

公开(公告)日：1988-07-14

申请号：DE3376969

申请日：1983-02-23

Applicant: IBM

Inventor： GENDLER PAUL LEWIS ,  JAFFE ANNETTE BRONKESH ,  TWIEG ROBERT JAMES ,  BERNIER WILLIAM EMMETT

IPC: B41M1/36 ,  B41M5/124 ,  B41M5/128 ,  B41M5/20 ,  B41M5/337 ,  B41M5/12 ,  B41M5/26

Abstract: Substrate comprises (1) leucomethylene blue dye (I) and (2), as stabiliser, citric, aspartic, malonic, oxalic, ascorbic or tartaric acids; ketomalonic acid monohydriate; glucose or methionine. Most pref. is malonic acid. Pref. the mole ratio of (I):stabiliser is about 1:1 and the substrate, which is esp. paper, may also contain bromide ions. Typically the paper is treated with an aq. soln. contg. 0.5-5 (1) wt. %(I), a stoichiometric amt. of stabiliser and 1-30(15)% bromide ion. Each 8.5 by 11 inch sheet of paper contains about 10 mg (I). The stabiliser inhibts background formation, i.e. oxidative conversion of (I) to the coloured form. The substrates are most useful for electrochromic printing and give prints of improved storage qualities.

公开(公告)号：DE2960177D1

公开(公告)日：1981-04-09

申请号：DE2960177

申请日：1979-02-23

Applicant: IBM

Inventor： CLECAK NICHOLAS JEFFRIES ,  GRANT BARBARA DIANNE ,  JAFFE ANNETTE BRONKESH ,  KELLER GARY SCOTT

IPC: C09K9/02 ,  G02F1/15 ,  G02F1/17 ,  G09F9/30

Abstract: This invention relates to a composition for use as a reactive medium in a reversible electrochromic display device. The reactive medium is placed between two electrically conductive electrodes of the device, at least one of the electrodes being transparent, the composition includes an anhydrous solvent and an oxidant/reductant pair in which the reductant is an electron acceptor, and the oxidant is a substituted fluorene compound.