Synthetic resins or natural rubbers -- part of the class 520 ser – Synthetic resins – Mixing of two or more solid polymers; mixing of solid...
Patent
1978-08-17
1980-08-12
Levin, Stanford M.
Synthetic resins or natural rubbers -- part of the class 520 ser
Synthetic resins
Mixing of two or more solid polymers; mixing of solid...
260 334R, 528496, C08F 622, C08F 624, C08F 812
Patent
active
042174236
ABSTRACT:
The difficulty of successfully and rapidly filtering finely divided ethylene-vinyl ester interpolymer particles containing at least about 30% by weight of copolymerized vinyl ester from aqueous dispersion media is overcome by the addition of an anti-coalescing amount of a lower saturated aliphatic monohydroxyl alcohol such as ethanol or isopropanol to the aqueous dispersion media accompanied by, or followed with, agitation prior to recovering the interpolymer particles therefrom. Maintaining the filtered ethylene-vinyl ester interpolymer particles in the alcohol-wet condition resists the tendency of the particles to coalesce into unmanageable agglomerates, formation of which otherwise tends to limit or even preclude the use of the interpolymer with respect to some applications. Solid phase alcoholysis of the alcohol-wet ethylene-vinyl ester interpolymer filter cake is also disclosed.
REFERENCES:
patent: 3510463 (1970-05-01), Bristol
patent: 3622555 (1971-11-01), Rothanbury et al.
patent: 3780004 (1973-12-01), Hoyt et al.
Levin Stanford M.
National Distillers and Chemical Corporation
Tremain Kenneth D.
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