The paper studies in less general scales of Banach spaces the
dynamics generated
by a Cahn-Hilliard type equation in a smooth open bounded domain of any space dimensions. The
equation on the boundary satisfy nonlinear conditions. It establishes local well posedness of the
problem and a priori uniform on the domain boundedness and existence in the large of the solutions
is studied. It also discusses the asymptotic behaviour of the solutions in the form of existence of a
global attractor. An adequate notion of upper semicontinuity of the attractor in the limit of high
viscosity is considered and the limit attractor is found to correspond to finite dimensional processes.
These processes are depicted by limits of the spatial average solutions of the problem.