Synonyms: Poly(iminocarbonyltrimethylene)(8CI); 2-Pyrrolidinone polymer, SRU; 4-Aminobutyric acid polymer, SRU; Nylon 4;Nylon 4 SRU; Poly(2-pyrrolidinone), SRU; Poly(4-aminobutanoic acid), sru;Poly(4-aminobutyric acid), SRU; Poly(pyrrolidone), SRU; Poly-2-pyrrolidone,SRU; Poly-a-pyrrolidone, SRU; Polyamide 4;Polybutanamide; Polybutyramide; Polypyrrolidinone, SRU; a-Pyrrolidinone polymer, SRU; a-Pyrrolidone polymer, SRU