| 摘要 |
What are disclosed are aromatic polyethers which are resistant to high temperature, having a reduced viscosity greater than 0.25 dl/g and a repeating structural unit [(A-O)a (B-O)b (C-O)c], wherein A is 5a,10b-diphenyl-coumarano[2',3',2,3]coumaran of the formula <IMAGE> B has the formula <IMAGE> wherein n is 0 or 1, and X is <IMAGE> and/or <IMAGE> and C is at least one further aromatic unit.
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