Patent ID: 7015278

Claim:
Formulations formed by aqueous dispersions of cationic ionomer fluorinated polyurethanes based on (per)fluoropolyethers, having end groups constituted by —NCO groups reacted with hydrogenactive compounds to give covalent bonds stable to water but thermolabile, which comply with the following test: by reacting the hydrogenactive compounds with tetramethyl-xylylenediisocyanate (TMXDI) and by thermal treatment between 80° C. and 180° C. for two minutes in the presence of dibutyltin dilaurate (DBTDL) as catalyst, at least 50% of the —NCO groups are restored, wherein the cationic fluorinated polvurethanes are formed by units deriving from the following monomers: a) hydrogenated diisocyanates having formula: OCN—R—NCO (VIa) wherein R is a bifunctional radical: C 2 –C 12 aliphatic; C 6 –C 18 cycloaliphatic or aromatic, alkylen-cycloaliphatic or aromatic, wherein optionally the cycloaliphatic ring can be substituted with one or more C 1 –C 3 alkyl groups; bicyclo aliphatic or aromatic, wherein the rings are as above, optionally linked by a C 1 –C 6 alkylene chain; b) bifunctional (per) fluoropolyethers (PFPE) having hydroxyl end groups, with number average molecular weight in the range 400–4,000; c) one or more of the following diols containing an amino group: c.1 diols with side amino group, of formula: wherein R N is a linear or branched C 1 –C 6 alkyl, zII is 1 or 2, when zII =1 the nitrogen free valence is saturated with one H atom, R c1 is H or C 1 –C 4 alkyl, NI is an integer and ranges from 1 to 4, NIA is an integer and ranges from 0 to 4, NIB is an integer and ranges from 1 to 4. c.2 diols with amino group in the chain, of formula: wherein R N and NI have the above meanings; d) hydrogenactive compounds forming with the —NCO functions covalent bonds stable at the hydrolysis but thermolabile, as defined in claim 1 ; and optionally the following: e) C 2 –C 10 hydrogenated aliphatic diols or diamines, C 4 –C 6 cycloaliphatic, optionally substituted with C 1 –C 4 aliphatic chains, and C 6 –C 14 aromatic or alkyl aromatic.