Most properties of polymers depend on molecular weight, molecular weight distribution and lots of other things - they are dependant on manufacturer and grade.
Based on the description you provided, the HS code for methyl acrylate is 2916.12.
If you need additional help with HS classification why not visit www.3ceonline.com?
Acrylate polymers are used for a variety of things. A couple of examples:
Plexiglas is poly(methyl methacrylate).
The sticky part of sticky notes is often a polyacrylate.