Hoechst Aktiengesellschaft

Johannes Brandrup

Edgar Fischer

Jurgen Weinlich

Dietrich Fleischer

Wolfram Busch

Werner Schwertfeger

Hans Millauer

Kurt Kraft

Peter Blickle

Werner Sommer

Franz Mayer

Horst Semmler

Gerhard Gebauer

Eckhard Weber

G/u/ Nter Siegemund

The invention provides finely dispersed, agglomeration-free chloropolyethylene having good rubber and anti-blocking properties. The invention provides furthermore a process for the manufacture of such a chloropolyethylene, according to which chlorination of the starting polyethylene is carried out in the presence of a dispersing agent system of poly-N-vinylprrolidone and hydrophobic silicic acid. This process allows also the use of polyethylene types having a pronounced tendency to agglomeration.

Chloropolyethylene, process for the manufacture thereof and its use

The invention relates to a thermoplastic composition which comprises vinyl chloride polymers and chlorinated polyethylene and which contains finely divided fluoropolymers and has a markedly improved processability, particularly when shaped by extrusion.

Thermoplastic compositions comprising vinyl chloride polymer, CLPE and

Substantially non-crosslinked fluorocarbon polymers containing carboxyl groups are prepared starting from non-crosslinked and in some cases new, fluorocarbon polymers in which the linear macromolecules carry side chains containing the end group --CHFX (X is F or CF.sub.3). The starting polymers are first reacted with peroxodisulfuryl difluoride FSO.sub.2 O--OSO.sub.2 F to give the corresponding fluorosulfato derivatives containing the side chain end groups. ##STR1## In the event that X is F, these derivaties are then converted into the corresponding carboalkoxy derivatives by means of an alcohol, the fluorosulfato group being split off, and these carboalkoxy derivatives are then converted by saponification into the products containing the free carboxyl groups; the fluorosulfato derivatives can also be hydrolyzed with water, if appropriate in the presence of an inert solvent and/or bases, to give, without further treatment, the products containing the free carboxyl groups. The fluorosulfato derivatives in which X is CF.sub.3 in the side chain end groups are first decomposed in the presence of catalytic amounts of alkali metal fluorides and/or aprotic nitrogen bases to give the products containing the side chain end groups ##STR2## and the latter are then hydrolyzed to give the products containing the free carboxyl group. Virtually non-crosslinked fluorocarbon polymers containing carboxyl groups are of industrial importance in the form of cation exchanger membranes in electrolytic cells, particularly in chlor-alkali electrolysis.

Process for the preparation of fluorocarbon polymers containing carboxyl

A process for the manufacture of vinyl chloride polymers by polymerization of the monomer or monomer mixture in a reactor in which the internal walls, and the other parts on which polymer deposits can form, have a covering which contains a representative compound such as depicted by the formula ##STR1## extensive suppression of polymer crusts is thereby obtained.

Process for the manufacture of vinyl chloride polymers by coating

Free-flowing chloropolyethylene in powder form which keeps this property after prolonged storage and has good processing properties is impregnated substantially on the particle surface with definite amounts of fine-grained vinyl chloride polymer and fine-grained organic substance in a definite proportion. The invention also relates to a process for the manufacture of such an improved chloropolyethylene and the use thereof.

Free flowing chloropolyethylene, its manufacture and use

The present invention provides a process for the manufacture of vinyl chloride polymers by polymerization of the monomer or monomer mixture in aqueous dispersion in the presence of radical-forming catalysts and optionally suspension stabilizers, emulsifiers and further polymerization auxiliaries, which comprises carrying out the polymerization in a reactor the inner walls of which and other parts where polymer deposits may form are coated partially or entirely with a coating containing determined compounds of the formula ##STR1## In accordance with this invention, a substantial suppression of polymer deposit formation is achieved especially in the case of vinyl chloride copolymers.

Polymerization of vinylic monomer in presence of benzothiazol-hydrazones

There is provided a process for the manufacture of vinyl chloride homopolymers, copolymers or graft polymers by carrying out the polymerization in a reactor the inner parts and inserts of which are coated with a coating consisting of defined hydrazine derivatives and, preferably, a film-forming material as carrier substance.

Process for the manufacture of vinyl chloride polymers

The invention provides a high temperature resistant anti-adhesion and slide lacquer composed substantially of finely distributed low molecular polytetrafluorethylene, a polytriketo-imidazolidine resin and a solvent or solvent mixture. The system of the invention may be applied to the substrate in one single operation.

Growing community of inventors

Wiesbaden, Germany

Johannes Brandrup