Yes. Anytime you sync with iTunes®, knitCompanion will automatically transfer all new patterns it has to your computer. You can locate them easily in iTunes under your iPad’s Apps tab, scroll down to File Sharing and select knitCompanion. From there you can place the PDFs into your library (cloud, ravelry, hard drive, etc.)
Please note, the designer patterns distributed with knitCompanion will not be synced, they are available within knitCompanion only. If you want a PDF of those patterns in your library outside knitCompanion please contact the designer directly.