Patent ID: 6500894
Filing Date: 2002-12-31
Classification: C08G,C08L,C09D,D06M

Abstract:
Compositions formed of aqueous dispersions comprising a mixture of the following fluorinated polymers:A) (meth)acrylic (co)polymers containing fluorine, and B) cationic ionomers of fluorinated polyurethanes based on (per)fluoropolyethers, obtained by the following steps: a first step, wherein a fluorinated diisocyanate prepolymer is prepared by reacting with hydrogenated diisocyanates in organic solvents of polar type, bifunctional (per)fluoropolyethers having alcoholic or acid functionality, optionally mixed with hydrogenated macrodiols; a second step, consisting of: I) partial chain extension by chain extenders, then subsequent dispersion in water and salification with polymerization completion by formation of ureic bonds; or II) insertion of ionomers and then salification, dispersion and polymerization by chain extension in water in the presence of daimines; or III) insertion of ionomers and completion of the chain extension insolvent to obtain the polymer having the desired molecular weight, and contemporaneous dispersion and salification in water of the so obtained polymer, alternatively the polymer first salified and then dispersed in water; wherein the weight ratio A):B), calculated on the dry product, being in the range 70:30 and 30:70, with the proviso that component A) must not be lower than about 0.5% by weight as dry products in the dispersion.