Patent attributes
Fluorinated oligourethanes, having number average molecular weight lower than or equal to 9,000, having a branched structure, formed of the following monomers and macromers:a) aliphatic, cycloaliphatic or aromatic polyisocyanates,b) heterofunctional hydrogenated monomers having general formula:X0—(CR1AR2A)b—Y0 (Ib)one or more of the following compounds:c) bifunctional hydroxyl (per)fluoropolyethers (PFPE diols) having number average molecular weight in the range 400-3,000,e) monofunctional hydroxyl (per)fluoropolyethers or monofunctional hydroxyl (per)fluoroalkanes (e′), having number average molecular weight in the range 300-1,000,and optionally the following compounds:d) heterofunctional monomers,dI) hydrogen-active compounds, capable to form bonds with the NCO functions stable at the hydrolysis but weak at heat.
