Process for making narrow molecular weight distribution polyviny

Details Process for making narrow molecular weight distribution polyviny Process for making narrow molecular weight distribution polyviny

1993-04-21

1994-08-16

Schofer, Joseph L.

Synthetic resins or natural rubbers -- part of the class 520 ser

Synthetic resins

Polymers from only ethylenic monomers or processes of...

526209, 526264, C08F 204, C08F 2610

Patent

active

053388143

ABSTRACT:
A process for making polyvinylpyrrolidone (PVP) K-90 having a polydispersity of less than 6, preferably less than 5, and most preferably, less than 4, which comprises polymerizing vinylpyrrolidone monomer by free radical solution polymerization, in water, in the presence of polyethylene glycol (PEG) having a molecular weight of about 300 as a chain transfer agent. The product is an aqueous solution of 15-25% PVP K-90, preferably 20%, 15-30% PEG, preferably 25%, and 45-70% water, preferably 55%, by weight of the solution.

REFERENCES:
patent: 4699146 (1987-10-01), Sieverding

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