  We study the scattering of longitudinally polarized W bosons in extensions of
the Standard Model where anomalous Higgs couplings to gauge sector and higher
order O(p^4) operators are considered. These new couplings with respect to the
Standard Model should be thought as the low energy remnants of some new
dynamics involving the electroweak symmetry breaking sector. By imposing
unitarity and causality constraints on the WW scattering amplitudes we find
relevant restrictions on the possible values of the new couplings and the
presence of new resonances above 300 GeV. We investigate the properties of
these new resonances and their experimental detectability. Custodial symmetry
is assumed to be exact throughout and the calculation avoids using the
Equivalence Theorem as much as possible.
