Dispersing stabilizer for suspension polymerization of vinyl chl

Details Dispersing stabilizer for suspension polymerization of vinyl chl Dispersing stabilizer for suspension polymerization of vinyl chl

1995-03-17

1998-07-14

Henderson, Christopher

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

Synthetic resins

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

526202, C08F 812, C08F 220

Patent

active

057805474

ABSTRACT:
A dispersing stabilizer suitable for suspension polymerization of vinyl chloride or a monomer mixture mainly composed of vinyl chloride which can be used in a hot water charging polymerization process without any problems, and which can produce vinyl chloride homopolymer or copolymers having a good porosity, a large bulk density, a very low content of coarse particles and good physical properties, the dispersing stabilizer comprising a polyvinyl alcohol having a degree of hydrolysis of 75 to 85% by mole, an absorbance of not less than 0.1 measured at a wavelength of 280 m.mu. with respect to the 0.1% by weight aqueous solution, a content of carboxyl group of 0.01 to 0.15% by mole and a cloud point of not less than 50.degree. C. measured with respect to the 0.1% by weight aqueous solution.

REFERENCES:
patent: 2715590 (1955-08-01), Brockman
patent: 3523933 (1970-08-01), Inskip
patent: 3689469 (1972-09-01), Inskip
patent: 4172930 (1979-10-01), Kajitani
patent: 4401790 (1983-08-01), Ter Jung
patent: 4678832 (1987-07-01), Pospich
patent: 5019609 (1991-05-01), Toyonishi

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