Preparation of a photochromic ink

    公开(公告)号:AU2009336680A1

    公开(公告)日:2011-07-28

    申请号:AU2009336680

    申请日:2009-12-23

    Applicant: BASF SE

    Abstract: The present invention relates to a photochromic ink, the process for its preparation which is based on a spiropyran powder obtainable by melting, cooling and crushing, and to a new form of a spiropyran obtainable thereby. Said process to prepare a photochromic ink comprises the steps of a) heating and melting the spiropyran at a temperature below 250 C, b) cooling the melt to obtain a solidified spiropyran, c) crushing the solidified spiropyran to obtain a powder, d) optionally adding the powder to a binder providing the basis for the photochromic ink.

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