Kindly see...

https://en.wikipedia.org/wiki/Polyvinylpyrrolidone

See also...

http://www.chemicalbook.com/ChemicalProductProperty_EN_CB4209342.htm

Explore this...

https://www.nature.com/articles/pj198512.pdf?origin=publication_detail

See too...

http://greenpharmchem.com/What_Does_PVP_Stand_For_In_Chemical_Industrial.html

Also see..

http://www.jpharmsci.org/article/S0095-9553(15)34189-5/pdf

Check too..

http://www.brenntag.com/media/documents/bsi/product_data_sheets/material_science/ashland_polymers/pvp_polymers_brochure.pdf

Explore too..

https://pubchem.ncbi.nlm.nih.gov/compound/Povidone-iodine

See too..

https://pubchem.ncbi.nlm.nih.gov/compound/n-vinyl-2-pyrrolidone

https://web.njit.edu/~mitra/green_chemistry/EXP_2.htm