Method for providing improved colloidal stability and polyvinyl

Details Method for providing improved colloidal stability and polyvinyl Method for providing improved colloidal stability and polyvinyl

1989-06-07

1990-09-18

Henderson, Christopher

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

Synthetic resins

Polymers from only ethylenic monomers or processes of...

526202, 5263442, C08F 220

Patent

active

049579835

ABSTRACT:
A method for polymerizing polyvinyl chloride and polyvinyl chloride copolymers is provided in which a monomer slurry is formed by adding the monomers and water (hot or cold) in the reaction vessel, and the slurry is brought to reaction temperature. After a time delay of 0 to 15 minutes, an emulsifier package is added, and after a further time delay of 0 to 15 minutes, a catalyst emulsion is added. The emulsifier package comprises a primary emulsifier which is partially saponified polyvinyl alcohol having a degree of saponification between about 60 and about 90 mole percent and a solubility in methanol index at 55.degree. C. in a range of up to about 60 percent. A secondary emulsifier is included in the emulsifier package which is a preferably cellulosic type emulsifier. Preferably an additional emulsifier is added which is a hydrolyzed polyvinyl acetate having a degree of hydrolysis of at least 68 percent. The polymerization product has good bulk density and porosity parameters. Resins produced from this product have low fisheye characteristics.

REFERENCES:
patent: 4324878 (1982-04-01), Biaggi
patent: 4464519 (1984-08-01), Mango
patent: 4526946 (1985-07-01), Fitzpatrick
Technical Publication of Kuraray Co., Ltd.

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