Method for producing chlorinated vinyl chloride resin

Details Method for producing chlorinated vinyl chloride resin Method for producing chlorinated vinyl chloride resin

2007-01-17

2008-03-18

Rabago, Roberto (Department: 1796)

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

Synthetic resins

Mixing of two or more solid polymers; mixing of solid...

C525S355000, C525S356000, C525S358000

Reexamination Certificate

active

07345114

ABSTRACT:
According to the present invention, during or after the process of separating an aqueous solution of hydrochloric acid by-produced from a chlorinated vinyl chloride resin slurry obtained by chlorinating vinyl chloride resin or a copolymer of vinyl chloride and another copolymerizable monomer, hypochlorite is added to the chlorinated vinyl chloride slurry or water-containing resin. Due to this, the concentration of hydrochloric acid in the chlorinated vinyl chloride resin or chlorinated vinyl chloride copolymer resin before drying is reduced, and the problem of removing hydrochloric acid in the subsequent drying treatment is reduced, whereby the problem of corrosion of a drier can be reduced.

REFERENCES:
patent: 5359011 (1994-10-01), Vielhaber et al.
patent: 46-17128 (1971-05-01), None
patent: 2001-011116 (2001-01-01), None
patent: 2003-238615 (2003-08-01), None
patent: 2004-099669 (2004-04-01), None

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