Dissociative in regards to Iron Man? Not any more than any other super hero, and definitely not as much as say the Sentinel or Batman when it comes to their persona. For instance, Batman and Bruce almost seem like two separate entities, Bruce compartmentalizes as to completely preserve his secret identity and there was no way he could live all day every day as either one without doing some serious damage to himself.

Tony tries to find redemption as Iron Man. Iron Man seems to be more like what Tony strives to achieve, he wants to be a hero, a good man. But as Tony stark he carries all the baggage of his past mistakes and just who he is.

I think the separate persona line of thought could be confusion from when Tony was actually trying to make the world and his fellow Avengers think that they were two different people. But if you notice, once they other Avengers find out, you lose that whole 'two different people' concept. But I see where you would think that.