| 摘要 |
Cmpositions for coatings having a dry content higher than 80%, preferably of about 85-90% by weight, based on polyisocyanates and PFPEs, completely crosslinkable also in a range of temperatures between 5° C. and 20° C., comprising the following components:Component 1): mixture comprising:1.a) Partially fluorinated prepolymers, having free NCO groups, obtained by reaction of (per)fluoropolyethers (PFPEs) diols having number average molecular weight Mn in the range 800-1,300 with the cyclic trimer of the isophorondiisocyanate,1.b) non cyclic isocyanic trimer of hexamethylendiisocyanate,Component 2): (per) fluoropolyether (PFPE) diol with Mn in the range 350-700, preferably 500-650,component 3): inert organic solvent in crosslinking conditions, complement to 100% by weight of the composition.
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