Synthetic resins or natural rubbers -- part of the class 520 ser – Synthetic resins – Polymers from only ethylenic monomers or processes of...
Patent
1998-05-08
1999-11-02
Henderson, Christopher
Synthetic resins or natural rubbers -- part of the class 520 ser
Synthetic resins
Polymers from only ethylenic monomers or processes of...
5263442, C08F 220
Patent
active
059772735
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: 3689466 (1972-09-01), Bridgeford
patent: 3689469 (1972-09-01), Inskip
patent: 3817959 (1974-06-01), Balewe 526202
Hayashi Shunro
Onishi Kizo
Saeki Masaru
Henderson Christopher
Nippon Gohsei Kagaku Kogyo Kabushiki Kaisha
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