Can I ask professor to send me a copy of papers?
Yes, you can, and you should. It is not impolite (unless you actually have access), and it is not unethical. I don't think it is illegal, if you do not distribute it further, and it is certainly not uncommon.

First, make sure you really don't have access (otherwise, you risk looking a bit like a fool), then ask him. Don't make a big deal of it, just explain that you lack access and you believe he may have them, if so could he please send them.