Partially saponified polyvinyl acetates and their application in

Details Partially saponified polyvinyl acetates and their application in Partially saponified polyvinyl acetates and their application in

1979-05-23

1981-03-24

Levin, Stanford M.

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

Synthetic resins

Polymers from only ethylenic monomers or processes of...

521109, 521117, 525 56, 525 61, 525 62, 526344, C08F 220

Patent

active

042581630

ABSTRACT:
This invention relates to novel partially saponified polyvinyl acetates with a degree of hydrolysis of 30 to 65 mole % which might be considered as vinyl alcohol-vinyl acetate block copolymers. The invention relates further to the application of said novel block copolymers as a pore-forming additive used together with at least one known protective colloid in the homo- and copolymerization of vinyl compounds, primarily of vinyl chloride in a pure aqueous medium.

REFERENCES:
patent: 2812318 (1957-11-01), Kraeger et al.
patent: 3444125 (1969-05-01), Schimelpfenig et al.
patent: 3592800 (1971-07-01), Oschmann et al.
patent: 3929753 (1975-12-01), Itoh et al.

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