Basf Se Corporation

Bruno Inderbitzin

Marc Maurer

Paul Van Der Schaaf

André Fuchs

Leonhard Feiler

Marie-Claire Hermant

Martina Schoemer

Thomas Raimann

Max Hügin

Martina Schömer

A filament containing a core material (CM) coated with a layer of shell material (SM), wherein the (CM) contains the components a) to c):

Filaments based on a coated core material

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.

Preparation of a photochromic ink

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Bouxwiller, France

Bruno Inderbitzin