Preparation of ultrapure N-vinylpyrrolidone polymers

Details Preparation of ultrapure N-vinylpyrrolidone polymers Preparation of ultrapure N-vinylpyrrolidone polymers

1992-11-30

1994-10-11

Michl, Paul R.

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

Synthetic resins

Processes of preparing a desired or intentional composition...

528480, 21050021, 210651, 210908, 21050027, 21050038, 21050041, C08J 307, B01D 6114

Patent

active

053549457

ABSTRACT:
A process for preparing ultrapure polymers (or solutions thereof) which contain at least 20% by weight of N-vinylpyrrolidone as copolymerized units and have a Fikentscher K value of from 10 to 45 by customary free-radical polymerization in solution and subsequent purification of the solution with or without drying comprises purifying the solutions of the polymers by separating off the low molecular weight impurities by means of ultrafiltration at from 20.degree. to 100.degree. C. and from 1 to 80 bar.

REFERENCES:
patent: 4636540 (1987-01-01), Warfel
patent: 5130025 (1992-07-01), Lefebvre et al.
patent: 5171767 (1992-12-01), Buckley et al.
Hwang et al., "Membranes in Separations," Techniques of Chemistry vol. VII, Weissberger, Ed., John Wiley, New York, 1975.
Sigma Chemicals Catalog, p. 1900.
Magnitskii et al., "Possibility of Using Hydrophilic Films . . . ," Tr. Mosk. Khim.-Tekhnol. Inst, 80, 158-161, 1974.
CA104(4): 24020y (Jpn. Kokai Tokkyo Koho JP 60153903, A2 Aug. 13, 1985 Showa, 5 pages).
Jonsson et al., "Separation Characteristics of Ultra Filtration Membranes," Membranes and Membrane Processes, Drioli et al., ed., New York, N.Y., Plenum Press, 179-190, 1986.

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