Subchapter II of chapter 99 is amended by inserting in numerical sequence the following new heading: 9902.11.51 3,5-Dimethyl-1H-pyrazole-oligo(hexamethylene diisocyanate) in solvents (CAS No. 163206–31–3) (provided for in subheading 3911.90.90). Free No change No change On or before 12/31/2020 . 1036. Nourybond 276 curing agent Subchapter II of chapter 99 is amended by inserting in numerical sequence the following new heading: 9902.11.52 α-Alkenes, C 14 -C 20 , polymers with maleic anhydride, 2-(1-piperazinyl) ethylimides, plasticized with diisononyl phthalate (CAS No. 28553–12–0) and bis(1-methylethyl)-naphthalene (CAS No. 38640–62–9) (provided for in subheading 3911.90.90) Free No change No change On or before 12/31/2020 . 1037. P84 polyimide powder Subchapter II of chapter 99 is amended by inserting in numerical sequence the following new heading: 9902.11.53 2,4-Diisocyanato-1-methylbenzene