Fluorochemical copolymers and ovenable paperboard and textile fibers treated therewith

Claim 1

Paperboard, having incorporated thereon sufficient fluorochemical copolymer to render said paperboard ovenable, said copolymer comprising (by weight) about: (a) 60 to 80% of polymer chain repeat units derived from fluoroacrylate monomer of the formula: (R.sub.f).sub.p QOCOCH═CH.sub.2 wherein R f is a fluoroaliphatic radical-containing group having 3 to 20 carbon atoms, Q is a polyvalent organic connecting group, and p is 1 or 2; (b) 1 to 30% of polymer chain repeat units derived from alkyl or alkoxyalkyl acrylate or methacrylate monomer of the formula: R.sup.1 O(R.sup.2 O).sub.n [C(O)CH.sub.2 O].sub.m COCR.sup.3 ═CH.sub.2 wherein R 1 is a C 1-20 alkyl or cycloalkyl group, R 2 is a C 1-6 alkylene group, each R 2 group can be the same as or different from other R 2 groups, n is zero to about 10 with the proviso that when n is zero R 1 is a C 1-16 alkyl or cycloalkyl group, m is zero or 1, and R 3 is H or methyl; (c) 2 to 15% of polymer chain repeat units derived from monomer of the formula: ##STR13## wherein R 4 is H or methyl; (d) 1 to 6% of polymer chain repeat units derived from cationic monomer of the formula: CH.sub.2 ═C(R.sup.5)ZY.sup.+ X.sup.- wherein R 5 is H or methyl, Z is a divalent electron-withdrawing group which activates free-radical polymerization, Y + is a monovalent cationogenic group, and X - is a water solubilizing anion; and (e) 0 to 20% of polymer chain repeat units derived from vinylidene chloride; with the proviso that the weight percent of carbon-bonded fluorine in said copolymer is at least about 15%.