Methods for paper sizing with fluorinated polymers
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United States of America Patent
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Jan 29, 2008
Grant Date -
Jul 24, 2003
app pub date -
Jun 28, 2002
filing date -
Jul 5, 2001
priority date (Note) -
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Abstract
Use for the paper sizing of aqueous polyurethane dispersions from (per)fluoropolyethers obtainable by reaction among the following compounds: a) (per)fluoropolyether diols having a number average molecular weight from 400 to 5,000; b) diisocyanates having formula: OCN--R--NCO (VIa) wherein R is an aliphatic, cycloaliphatic bifunctional radical; or an aromatic bifunctional radical; c) diols containing one carboxylic function and optionally one or both the following components: d) hydrazine and/or aliphatic diamines; e) monofunctional hydroxylic (per)fluoropolyethers having a number average molecular weight in the range 300-1,000.
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