Other non-ionic monomers that may be used include ethylenically unsaturated monomers that carry a pendant group -Am Bn Ap R wherein B is ethyleneoxy, n is an integer of at least 2, A is propyleneoxy or butyleneoxy, m and p are each an integer less than n and preferably below 2 and most preferably zero, and R is a hydrophobic group containing at least 8 carbon atoms.