Process for producing vinyl chloride polymer, with iron chelates

Details Process for producing vinyl chloride polymer, with iron chelates Process for producing vinyl chloride polymer, with iron chelates

1997-04-29

2000-02-08

Henderson, Christopher

Synthetic resins or natural rubbers -- part of the class 520 ser

Synthetic resins

Polymerizing in reactor of specified material, or in reactor...

526 93, C08F 220

Patent

active

060229322

ABSTRACT:
In a process for producing vinyl chloride polymers including polymerization of vinyl chloride or a monomer mixture containing it in an aqueous medium using a polymerization initiator, the polymerization is carried out in the presence of a chelating agent, The chelating agent is capable of chelating iron (II) and iron (III). This process makes it possible to prevent polymer scales from adhering to, e.g. baffle surfaces facing inner walls of the polymerization vessel, which has been hitherto difficult to do so, and less cause initial discoloration of polymer products to improve quality. It is more effective to use a polymerization vessel previously provided with coating films of a polymer scale preventive agent on the inner walls of the polymerization vessel and the other portions with which monomers come into contact in the course of polymerization.

REFERENCES:
patent: 3953398 (1976-04-01), Kline
patent: 5201945 (1993-04-01), Shimizu et al.
patent: 5691428 (1997-11-01), Shimizu
patent: 5728781 (1998-03-01), Usuki
Chemical Abstracts, AN 88:51507, JP 52-087491, Jul. 21, 1977.

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