Fluorinated oligourethanes
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United States of America Patent
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Jan 29, 2008
Grant Date -
N/A
app pub date -
Jun 12, 2000
filing date -
Jun 11, 1999
priority date (Note) -
Expired
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Abstract
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: X.sub.0--(CR.sub.1.sup.AR.sub.2.sup.A).sub.b--Y.sub.0 (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, d.sup.I) hydrogen-active compounds, capable to form bonds with the NCO functions stable at the hydrolysis but weak at heat.
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