Verfahren zur Herstellung einer vollkommen homogenen Lösung eines Polymerisats

Particulate thermoplastic polymers of ethylenically unsaturated monomers are rendered readily dispersible and non-swelling in the cold in solvents by heating the polymer at such a temperature and for such a time that a layer of degraded polymer is produced at the surface only of the particles. The h...

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Bibliographische Detailangaben
Hauptverfasser:	CERNIA,ENRICO, MARAGLIANO,DOMENICO
Format:	Patent
Sprache:	ger
Schlagworte:	AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F,C08G APPARATUS SPECIALLY ADAPTED FOR THE MANUFACTURE OF CARBONFILAMENTS CHEMICAL FEATURES IN THE MANUFACTURE OF ARTIFICIAL FILAMENTS,THREADS, FIBRES, BRISTLES OR RIBBONS CHEMISTRY COMPOSITIONS BASED THEREON GENERAL PROCESSES OF COMPOUNDING MACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONLY INVOLVINGCARBON-TO-CARBON UNSATURATED BONDS METALLURGY NATURAL OR ARTIFICIAL THREADS OR FIBRES ORGANIC MACROMOLECULAR COMPOUNDS SPINNING TEXTILES THEIR PREPARATION OR CHEMICAL WORKING-UP WORKING-UP
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Beschreibung
Zusammenfassung:	Particulate thermoplastic polymers of ethylenically unsaturated monomers are rendered readily dispersible and non-swelling in the cold in solvents by heating the polymer at such a temperature and for such a time that a layer of degraded polymer is produced at the surface only of the particles. The heating may be effected by suspending the particulate polymer in a non-solvent liquid such as water or ethylene glycol, and heating the liquid or blowing a current of steam through it, or by suspending the particles in a stream of hot gas, e.g. nitrogen, at 120 DEG C. Specified polymers are polyvinyl chloride, polyacrylonitrile, and copolymers of acrylonitrile with vinylpyridine or ethyl acrylate. Solutions formed by heating dispersions of the polymers in organic solvents are used in the manufacture of fibres and films. Specifications 712,568 and 735,183 are referred to.