This is an interesting copolymer variant in that one of the ingredients was a polymer to begin with.

Graft copolymers Graft copolymers are a special type of branched copolymer in which the side chains are structurally distinct from the main chain.

(2) It was then decided to change the technology and use polypropylene instead. An order was placed with the firm Indelpro S.A. to supply this material. A competitively priced proposal was received (1,200 dollars per tonne), but the supplier cancelled it upon learning that the destination was Cuba.