Sorry,but the catholic encyclopedia online disagrees. Scroll down to the section PROOF FROM SCRIPTURE
No direct or categorical and stringent proof of the dogma can be brought forward from Scripture. www.immaculateconception.com
You will also note ( by reading beyond the first sentence) that there is scriptural proof.
Please remember that Catholics are not naïve enough to believe in the man made myth of Sola Scriptura.
Well, what do they know?