In article , Ray Andraka
wrote:

N12345: "White Plains departure, unable 8000 due to icing, request 3000 as
final today"
WPD: "Negative, climb and maintain 8000"
N12345: "N12345 declaring an emergency"....

The Feds would smile all the way to your hearing on this one...it is an
emergency of your own making

This was going to be my response.
The FARs prohibit you from flying into icing in an aircraft not
certified for icing. By accepting the clearance, you are violating the
FARs.

Which leads to another question...

If ATC issues a clearance which will cause you to violate the FARs, are
you legally bound to accept it?