Synthetic resins or natural rubbers -- part of the class 520 ser – Synthetic resins – Polymers from only ethylenic monomers or processes of...
Patent
1990-03-16
1992-03-31
Henderson, Christopher
Synthetic resins or natural rubbers -- part of the class 520 ser
Synthetic resins
Polymers from only ethylenic monomers or processes of...
526200, 526202, C08F 1406
Patent
active
051009889
ABSTRACT:
A method for preparing vinyl chloride polymers which comprises polymerizing vinyl chloride monomer or a vinylic monomer mixture mainly composed of vinyl chloride in an aqueous medium in the presence of a polymerization initiator, characterized by washing a piping and an opening of a polymerizer, for charging the polymerization initiator into the polymerizer, with water, steam or a washing liquid capable of lowering the half-life of the polymerization initiator to not more than 30 minutes after introducing the initiator into the polymerizer. The method makes it possible to eliminate the formation of polymer scales on the piping and the opening for charging the polymerization initiator into a polymerizer and, therefore, the yield of the vinyl chloride polymers can greatly improved and the production cost can be substantially saved. Moreover, the polymer product does not include any materials used for washing said portions and thus polymer product of high quality can be provided in a high yield.
REFERENCES:
patent: 3669946 (1972-06-01), Koyanagi
patent: 3825512 (1974-07-01), Reiter
patent: 3842055 (1974-10-01), Gabriel
patent: 4020263 (1977-04-01), Winter
Amano Tadashi
Hoshida Shigehiro
Henderson Christopher
Shin-Etsu Chemical Co. , Ltd.
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