Process for producing a vinyl chloride-based polymer

Details Process for producing a vinyl chloride-based polymer Process for producing a vinyl chloride-based polymer

2005-03-01

2005-03-01

Cheung, William K. (Department: 1713)

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

Synthetic resins

Polymers from only ethylenic monomers or processes of...

C526S344200

Reexamination Certificate

active

06861488

ABSTRACT:
There is provided a process for producing a vinyl chloride-based polymer by conducting a suspension polymerization in an aqueous medium using an oil soluble polymerization initiator, wherein the oil soluble polymerization initiator utilizes a combination of (A) t-amyl peroxyneodecanoate and (B) a peroxide-based polymerization initiator with a 10 hour half-life temperature in a solution with a concentration of 0.1 mol/liter in trichloroethylene within a range of at least 30° C. but less than 55° C., and when a predetermined polymerization conversion rate is reached, the polymerization reaction temperature is raised by a predetermined amount, followed by addition of an antioxidant to said polymerization mixture to halt the polymerization reaction. According to this process, a vinyl chloride-based polymer with good anti-initial discoloration can be produced in high yield and with good productivity.

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patent: 281210 (1988-09-01), None
patent: 7-252307 (1995-10-01), None
Patent Abstracts of Japan, JP 57-139104, Aug. 27, 1982.

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