They are a family of polymers belonging to a type of vinyl polymers. Polyacrylates from acrylate monomers. Acrylate monomers are esters containing vinyl groups, that is, two carbon atoms joined by a double bond directly bonded to the carbonyl carbon.
Some acrylates have an extra methyl group bonded to the alpha carbon, and are called methacrylates. One of the most common methacrylate polymers is poly (methyl methacrylate).