Process for preparing water-soluble polymer

Details Process for preparing water-soluble polymer Process for preparing water-soluble polymer

1987-05-06

1989-04-25

Schofer, Joseph L.

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

Synthetic resins

Mixing of two or more solid polymers; mixing of solid...

5253282, 5253591, 5253593, 525378, C08F 810

Patent

active

048249130

ABSTRACT:
Disclosed herein is a process for preparing a water-soluble polymer, which comprises granulating a hydrous gel-like polymer obtained by polymerizing N-vinylformamide in the form of an aqueous solution of which a monomer concentration is 20 to 60% by weight, dispersing the formed polymer particles in methanol and contacting them with an aqueous solution of ammonium salt of a monovalent acid in an amount of 1 to 200% by mole based on the formamide groups in said polymer, thereby partially modifying the formamide groups in the polymer.

REFERENCES:
patent: 4421602 (1983-12-01), Brunnmueller et al.
patent: 4444667 (1984-04-01), Burkert et al.
patent: 4500437 (1985-02-01), Engelhardt et al.
patent: 4578515 (1986-03-01), Dawson et al.

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