METHOD FOR PRODUCING WATER-SOLUBLE NON-TURBID COPOLYMER OF AT LEAST ONE WATER-SOLUBLE N-VINYLLACTAM AND AT LEAST ONE HYDROPHOBIC COMONOMER

METHOD FOR PRODUCING WATER-SOLUBLE NON-TURBID COPOLYMER OF AT LEAST ONE WATER-SOLUBLE N-VINYLLACTAM AND AT LEAST ONE HYDROPHOBIC COMONOMER

PROBLEM TO BE SOLVED: To provide an improved method for producing a copolymer which is created by copolymerizing at least one hydrophilic N-vinyllactam and at least one hydrophobic comonomer and which is soluble in water to become a clear solution by free radical copolymerization in an organic solve...

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Bibliographische Detailangaben
Hauptverfasser: BOUQUET WOLFGANG, ULRICH FILGES, SCHUPP EBERHARD, MEISTER MARTIN DR, KLAUS SCHNELL, NEUTZNER JOSEF, NIEBERLE JUERGEN, STRUBE KARL-HERMANN, DIEING REINHOLD DR, POTZOLLI BERND DE, DOBRAWA RAINER, ANDREAS GRUBER, WIDMAIER RALF
Format: Patent
Sprache:eng
Schlagworte:
CHEMISTRY
COMPOSITIONS BASED THEREON
MACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONLY INVOLVINGCARBON-TO-CARBON UNSATURATED BONDS
METALLURGY
ORGANIC MACROMOLECULAR COMPOUNDS
THEIR PREPARATION OR CHEMICAL WORKING-UP
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Zusammenfassung:PROBLEM TO BE SOLVED: To provide an improved method for producing a copolymer which is created by copolymerizing at least one hydrophilic N-vinyllactam and at least one hydrophobic comonomer and which is soluble in water to become a clear solution by free radical copolymerization in an organic solvent.SOLUTION: After 70-99 wt.% of used N-vinyllactam is transformed, a combination of: distilling 3-30% of the reaction mixture away and continuing polymerization in the same solvent; and performing the polymerization under pressure so as to avoid evaporation of components, is performed.