What is the ERC (European Research Council)? Find more information here:

-ERC website
-Euresearch: the Swiss guide to European research & innovation

Q: Synergy Grant: Are there special rules about IPR between the participants? IF one PI is from a company and the other one from a university, how would they handle IP issues?

There are no special rules. The PIs will have to have internal arrangements, but it is left open for their choice on how this will be done. However, an IPR strategy should be developed, with regard to applicable local and national regulations and the rules regarding IPR in the Grant Agreement with the ERC.