Diethylene Glycol/DMAP Acrylamide/PEG-180/HDI Copolymer is a copolymer of diethylene glycol, dimethylaminopropyl (DMAP) acrylamide , PEG-180 (q.v.) and hexamethylene diisocyanate (HDI) monomers. See Reported Ingredient Functions-The Cosmetic Drug Distinction, in Regulatory and Ingredient Use Information, Volume I, Part A.