| 摘要 |
The present invention relates to a fluoropolymer-based coating material in tape or varnish form suitable for laser marking and containing as additive from 0.5% to 5% by weight of at least one polyimide comprising repeating units which include at least one group Ar-X-Ar', in which Ar and Ar' represent independently an optionally substituted monovalent or divalent aryl group and X represents a -CO- or -S- group, the said polyimide being essentially free from heteroatoms or heteratomic groups other than -S- and other than the imide groups.
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