Process of coating consisting of a mixture of vinyl chloride polymer and polyurethane with tertiary amine and/or ammonium groups

Claim 2

Process for the preparation of organic polymer compositions, which can be used, in particular for producing tubes and catheters, having good compatibility with biological materials, characterized in that a support is coated with a solution of a composition that consists of a mixture of vinyl chloride polymer and of polyether-urethane with tertiary amine and/or ammonium groups with the proportion of the polyether-urethane being from 1 to 99 percent by weight, relative to the total mixture, and in that this coated solution is evaporated.

Claim 3

Process according to claim 1, characterised in that the proportion of polyurethane is between 20 and 60% by weight.

Claim 4

Process according to claim 1, characterised in that the vinyl chloride polymer comprises at least 60% by weight of chloroethylene units.

Claim 5

Process according to claim 1, characterised in that the vinyl chloride polymer is a vinyl chloride homopolymer or a vinyl chloride/vinyl ester copolymer.

Claim 6

Process according to claim 1, characterised in that the polyether-urethanes are polyurethanes comprising oxyalkylene groups.

Claim 7

Compositions according to claim 1, characterised in that they satisfy: m+p≧0.5 and p+q≧(n/100)-2.5, the letters n, m, p and q respectively denoting: n: the number of milliequivalents of oxyethylene units --O--CH 2 --CH 2 -- per 100 g of polyurethane, m: the number of milliequivalents of tertiary amine groups, which may or may not be salified, per 100 g of polyurethane, p: the number of milliequivalents of quaternary ammonium groups per 100 g of polyurethane, and q: the number of milliequivalents of ionic groups per 100 g of vinyl chloride polymer.

Claim 8

Process according to claim 1, characterised in that the polyether-urethanes comprise a plurality of repeat units of the formula: --A--NH--CO--O--B--CO--NH-- (I) and of repeat units of the formula: --A--NH--CO--Z--NH (II) in which formulae: B is the divalent radical in a macrodiol of the polyether type, of the formula: HO--B--OH, A is the divalent radical in an aliphatic and/or cycloaliphatic and/or aromatic diisocyanate of the formula: O═C═N--A--N═C═O, and Z is a valence bond or a divalent radical such as: --NH--NH--CO--, --NH--CH 2 --CO--NH--NH--CO--, --NR 2 --D--NR 3 --CO or --O--M--O--CO--; R 2 , R 3 and M are such that NHR 2 --D--NHR 3 is a primary or secondary diamine and HO--M--OH is a diol.