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.degree. C. and
20.degree. 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.
