Which polymer has ‘chiral’ monomer (s) ?

Monomer’s of Nylon-6,6 are adipic acid & hexa methylene diamine, both are achiral. Monomers of Buna-N are 1,3 butadiene and acrylonitrile,both are achiral. Monomer’s of PHBV areβ- -hydroxy butanoic acid &β-hydroxy valeric acid, both carry chiral centres. Monomers of Neoprene is chloroprene which is achiral