I used to cut quite a bit of acrylic to use for photo frames and money boxes. It was only 3mm though.
I can';t remember the blade I used, but I do know it wasn't a reverse tooth as this tended to grab and lift the sheet.
I had to slow the saw down a bit to stop it melting back together. Always leave the protective plastic on while cutting, this also helps to stop it re-joining, not to mention preventing scratches. If the protective sheet is missing use clear packaging tape.
Oh and use safety glasses, as the dust eg splinters are hard and being clear it's the devils own job trying to get a piece out of you eye, (Enough said about that )