I would love to be able to work on my personal projects at work, but I feel I would be less productive because I would rather be working on those than my actual

I would love to be able to work on my personal projects at work, but I feel I would be less productive because I would rather be working on those than my actual work. I would also be in the mindset of thinking of my personal projects more than real work. Another concern I would have then if my company have a stake in my projects and seeking royalties if anything came of them. I'm curious about this topic though if anyone has more details about it.