Methods for paper sizing with fluorinated polymers

Details Methods for paper sizing with fluorinated polymers Methods for paper sizing with fluorinated polymers

2008-01-29

2008-01-29

Fortuna, José A. (Department: 1731)

Paper making and fiber liberation

Processes and products

Non-fiber additive

C162S135000, C162S164100

Reexamination Certificate

active

10183350

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:in-line-formulae description="In-line Formulae" end="lead"?OCN—R—NCO  (VIa)in-line-formulae description="In-line Formulae" end="tail"? 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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