  Using a perturbative model for diffractive interactions, we derive an
expression for the polarized diffractive structure function $g_1^D$ in the high
energy limit. This structure function is given by the interference of
diffractive amplitudes with polarized and unpolarized exchanges. For the
polarized exchange we consider both two-gluon and quark-antiquark amplitudes.
The polarized diffractive amplitude receives sizable contributions from
non-strongly ordered regions in phase space, resulting in a double logarithmic
enhancement at small $x$. The resummation of these double logarithmic terms is
outlined. We also discuss the transition from our perturbative expression to
the nonperturbative region. A first numerical estimate indicates that the
perturbative contribution to the spin asymmetry is substantially larger than
the nonperturbative one.
