申请人:Armstrong World Industries, Inc.
公开号:US04342696A1
公开(公告)日:1982-08-03
Substituted spirobi[2H-1-benzopyrans] particularly suitable for use as precursors to stable colored pyrylium salts are disclosed.
本发明揭示了一种特别适用于用作稳定的着色吡咯盐前体的取代的spirobi [2H-1-苯并吡喃]。