FAR 61.51(e)(i) "A recreational, Private or Commercial pilot my log PIC time for that flight time during which that time the person is the sole manipulator of the controls of an aircraft for which the person is rated"
But as you don't have an IR you are not rated to fly in IMC. So as soon as you enter IMC, you can only log Dual...
Huh? Yes, you aren't rated to fly in IMC, but the regulation doesn't say anything about whether you are rated for the flight conditions, only for the airplane. You are still rated for the airplane.
See
this legal opinion from the faa for details or
a somewhat less authoritative, but much clearer version.