| 摘要 |
The present invention relates to time-temperature indicator (TTI) systems comprising spiropyran indicator of formula (I) wherein Ris hydrogen,-C-Calkoxy, halogen,-C-Calkyl or-NO, Ris hydrogen or-C-Calkoxy; Ris NOor halogen; Ris hydrogen,-C-Calkoxy or halogen; Ris hydrogen, halogen,-C-Calkoxy,-COOH,-COO-C-Calkyl,-CFor phenyl; Rhydrogen or Rand Rform together a phenyl ring; Y is phenyl, naphthyl, anthracen-9-yl, 9H-fluoren-9-yl or a residue Formula (A) wherein Ris hydrogen, halogen,-C-Calkoxy,-NO,-CF,O-CF,-CN,-COO-C-Calkyl, phenyl or biphenyl, 9H-fluoren-9-yl; Ris hydrogen, halogen,-CN,-C-Calkoxy or Rand Rform together a phenyl ring; Ris hydrogen, halogen,-CN, or-C-Calkoxy; Ris hydrogen or halogen or CN. Ris hydrogen or halogen or CN. Ris-(CH)n-with n = 1-6 or-CH-CH=CH-. With the proviso that Formula (B) and Formula (C) are excluded.
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