Perfluoroalkyl group-containing copolymers

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The invention provides perfluoroalkyl group-containing copolymers prepared from at least two different monomers comprising, in each case, a polymerizable ethylenically unsaturated end group.
One of the two monomers has perfluoroalkyl group.
The monomers of the invention, which are copolymerized, include: (a) monomers containing acryloyl or methacryloyl groups and phenolic OH groups and corresponding to the foregoing formula (I); and (b) monomers containing acryloyloxy, methacryloyloxy, or vinyl groups and a perfluoroalkyl group and corresponding to the foregoing formula (II) or (III).
In preferred embodiments, the copolymers are prepared from 10 to 90 % of monomer component (a) and from 90 to 10 % of monomer component (b), in particular from 20 to 80 % of (a) and from 80 to 20 % of (b), and preferably m stands for 1.
##STR5## w is 6 to 12, z is 0 to 2 and B is O, based on formulae (II) and (III).
In principle, the copolymers are prepared in such a way that each of the monomer components must be present in an amount of at least 0.
5 %.
The indicated substituent groups of the compounds according to formulae (I) and (III) are attached to different carbon atoms of the molecules of these compounds.
In compound (II), however, this is not necessarily the case.
The perfluoroalkyl group is, either directly or through an unbranched or branched, saturated or unsaturated alkylene intermediate member having from 1 to 5 carbon atoms, linked to the ester function in formula (II) or to the ether or amide function in formula (III).
The perfluoroalkyl groups may be unsaturated or saturated, branched or unbranched and generally have from 5 to 15 carbon atoms, particularly from 6 to 12 carbon atoms.
They are preferably unbranched molecular radicals and have a maximum of two double bonds per molecular radical.
The molecular weights of the copolymers of the present invention are generally in the range from about 1,000 to 100,000, particularly in the range from 3,000 to 50,000