| 摘要 |
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: <?in-line-formulae description="In-line Formulae" end="lead"?>X<SUB>0</SUB>-(CR<SUB>1</SUB><SUP>A</SUP>R<SUB>2</SUB><SUP>A</SUP>)<SUB>b</SUB>-Y<SUB>0</SUB> (Ib)<?in-line-formulae description="In-line Formulae" end="tail"?> 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, d<SUP>I</SUP>) hydrogen-active compounds, capable to form bonds with the NCO functions stable at the hydrolysis but weak at heat.
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