PVC isn't often used any more in the making of plastics, I've heard here on CCF. That's a thing of yesteryear.
Your Wheats &
IHC's are copper. And copper metal can turn green with Verdigris cancer just with air and moisture, nothing to do with PVC whatsoever.
3 ring binders are absolutely ok. The clear plastic sleeves inside for your coin materials will be purchased separately "
for coins or currency", from a coin or hobby shop.
So no need to worry about that, same goes for plastic flips, coin tubes, etc. (Storage options like Freezer Ziplock baggies--again, no PVC is used in making them nowadays.)
Humidity, preventing coin on coin contact, & being airtight are the worries and challenges.
Professional grade albums like Whitman and Dansco are the popular choices for display of both sides of coins,
but stored in a bad environment , will still "tone" them.
This isn't due to PVC in the albums, it's strictly
environmental .
But so the 3 ring binder also absolutely gives viewing of both sides just like an album, as your sleeve inserts allow the 2x2's and such to be inserted in the slot pouches, hence allowing viewing of both sides just like an album. You just simply turn the page to see all the reverses, just like an album.
A nice advantage OVER albums, is that 3 ring binders allow different kinds, sizes, and types of coins versus albums have a specific hole, date, and mintmark generally speaking.
So, for example, you have 30 Indian Heads, but maybe only 11 different dates. 19 Indian Heads of the same date can be put into 2x2's and placed in the plastic pouches of your 3 ring binder for easy displaying of both sides.
With only an album, you have 11 holes filled and then a pile of duplicates. (Which CAN be put into 2x2's and just left in a loose pile), but this option gives you a place for your duplicates.