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

Inventor： MARC MAURER ,  MAX HUGIN ,  THOMAS RAIMANN ,  LEONHARD FEILER ,  BRUNO INDERBITZIN ,  ANDRE FUCHS

IPC: C09D11/00 ,  C07D491/107 ,  C09K9/02

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.