Process for producing vinyl chloride-based polymer

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

2006-02-21

2006-02-21

Teskin, Fred (Department: 1713)

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

Synthetic resins

Polymers from only ethylenic monomers or processes of...

C526S200000, C526S202000

Reexamination Certificate

active

07001960

ABSTRACT:
A process for producing a vinyl chloride-based polymer by suspension polymerization is provided. The polymerization is initiated in the presence of (A) a particular hydroxypropylmethylcellulose, (B) a particular partially saponified PVA with a saponification degree of 75 to 85 mol % and an average polymerization degree of 1000 to 3000, and (C) a particular partially saponified PVA with a saponification degree of 20 to 57 mol % and an average polymerization degree of 150 to 600 in a specified ration, and said (C) is also additionally added to the polymerization system when a conversion rate is 15–50%. Polymers with a high porosity, excellent plasticizer absorption, extremely low levels of fish eyes, and a high bulk specific gravity are produced at a high level of productivity.

REFERENCES:
patent: 4845174 (1989-07-01), Amano et al.
patent: 5204421 (1993-04-01), Amano et al.
patent: 1 524 492 (1978-09-01), None

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