Process of producing vinyl chloride polymer with mercapto termin

Details Process of producing vinyl chloride polymer with mercapto termin Process of producing vinyl chloride polymer with mercapto termin

1995-10-26

1997-10-14

Henderson, Christopher

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

Synthetic resins

Polymers from only ethylenic monomers or processes of...

526202, C08F 220

Patent

active

056774036

ABSTRACT:
This process uses, as dispersion stabilizers, (A) a partially saponified polyvinyl alcohol having an average polymerization degree of 300 to 2,000, a saponification degree of 70 to 85 mol %, and a mercapto group at least one terminal ends of its molecule chain, and (B) a hydroxypropylmethyl cellulose having a methoxy substitution of 26 to 30% by weight, a hydroxypropoxy substitution of 4 to 15% by weight, and a viscosity of 5 to 4,000 cP at 20.degree. C. in the state of a 2 weight % aqueous solution, in subjecting a vinyl monomer comprised mainly of vinyl chloride to suspension polymerization in an aqueous medium. A polymer which is high in porosity and will provide a molded item having few fish eyes can be produced in high productivity. Furthermore, since deposition of polymer scale on the inner wall of a polymerization vessel is little, removing the scale is easy and the polymerization vessel can be efficiently used.

REFERENCES:
patent: 5349008 (1994-09-01), Takada

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