Case T-189/06: Judgment of the General Court of 14 July 2011 — Arkema France v Commission (Competition — Agreements, decisions and concerted practices — Hydrogen peroxide and sodium perborate — Decision finding an infringement of Article 81 EC — Imputability of the infringement — Obligation to state the reasons on which the decision is based — Equal treatment — Principle of sound administration — Fines — Leniency Notice)