Synthetic resins or natural rubbers -- part of the class 520 ser – Synthetic resins – Mixing of two or more solid polymers; mixing of solid...
Patent
1991-02-27
1994-03-01
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...
5253269, 5253274, 5253282, 5253294, 5253303, 525355, 525358, C08F 812
Patent
active
052908801
ABSTRACT:
N-vinylformamide is polymerized with or without other water-soluble monoethylenically unsaturated monomers and with or without water-insoluble monoethylenically unsaturated monomers in not less than 30% strength by weight aqueous monomer solutions in the presence of a polymerization initiator at not more than 150.degree. C. in a kneader by a method in which the polymerization is carried out to such an extent that the initially formed water-containing polymer gel disintegrates into fine particles and the finely divided polymer obtainable in this manner is hydrolyzed, preferably in the kneader, so that not less than 0.1 mol % of the N-vinylformamide units present in the polymer are converted into vinylamine units. The polymers obtainable in this manner dissolve readily in water. The aqueous solutions are used, for example, in papermaking and tertiary oil production.
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Cram and Hammond, "Organic Chemistry", 1960, 275, McGraw-Hill.
Freudenberg Enrique
Hartmann Heinrich
Kroener Michael
Moench Dietmar
Sendhoff Norbert
BASF - Aktiengesellschaft
Schofer Joseph L.
Zitomer F.
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