“Crocs” that change colour.

title: COLOR CHANGING THERMOPLASTIC POLYURETHANE FOR SHOES

number: WO2012/118980

 publication date:  7 september 2012 (PCT)

applicant/assignee:  CROCS inc.

Gist: TPU with colour changing pigments for shoes.  

Why it is innovative:  Use of thermochromic and photochromic pigments in PU is known, although I am not sure both together have been used.  In this case both photochromic and thermochromic pigments are claimed, but as far as I read the claims correctly not together, which might have made it even more fun.

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