Process for the manufacture of vinyl chloride polymers by coating polymerization vessels
AssigneeHoechst Aktiengesellschaft
InventorsEdgar Fischer, Johannes Brandrup, Jurgen Weinlich
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Abstract
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.
Claims3
A process for the manufacture of vinyl chloride homopolymers or copolymers which contain at least 50% by weight of polymerized vinyl chloride units, by polymerization of the monomer or monomer mixture in aqueous dispersion comprising radical-forming catalysts and suspension stabilizers, said process comprises carrying out the polymerization in a reactor of which internal walls thereof, and the other parts thereof on which polymer deposits can form, are provided with a compound of the general formula ##STR39## in which the individual substituents have the following meanings:
- R.sub.1 to R.sub.2 is H or a saturated hydrocarbon radical with 1-8 C-atoms;
- R.sub.3 or R.sub.4 is a saturated hydrocarbon radical with 1-8 C-atoms, OH, or ##STR40## in which R' and R" have the same meaning as for R.sub.1 or R.sub.2, or denote an aromatic radical with 6 to 10 carbon atoms, or R.sub.4 denotes an O-aliphatic hydrocarbon radical with 1-6 C-atoms;
- or R.sub.3 and R.sub.4 denote --CH.sub.2 --CH.sub.2 --CH.sub.2 --or ##STR41## each of R.sub.5, R.sub.6, R.sub.7 denotes H;
- a saturated hydrocarbon radical with 1-8 C-atoms;
- or an aliphatic hydrocarbon radical with 1-6 C-atoms;
- or R.sub.5 and R.sub.6 is an isocyclic or heterocyclic aromatic radical with 6 to 10 C-atoms;
- and X is a monovalent anion or a corresponding anion equivalent.
Dependencies are inferred from the claim text.