a water-soluble polymer of vinyl pyrrolidone which has many applications, esp. in solution, e.g. as a synthetic blood plasma substitute, as a thickening, suspending, or binding agent in the cosmetic, , 1-vinüül-2-pürrolidooni radikaalpolümeerides saadav lineaarse ehitusega amorfne valge polümeer; molekulmass kuni 100 000, pehmenemist° 140-160 °C, tihedus 1,19 Mg/m3, lagunemist° 230-270 °C. Lahustub