Alkanolamine processing aid for ethylene-vinyl ester interpolyme

Synthetic resins or natural rubbers -- part of the class 520 ser – Synthetic resins – Ethylenically unsaturated reactant admixed with a preformed...

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525222, 528492, C08K 516, C08L 3306

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active

042437628

ABSTRACT:
The tendency of ethylene-vinyl ester interpolymer particles containing at least about 25% by weight of copolymerized vinyl ester to coalesce in the aqueous dispersion media in which they are prepared and consequently form unmanageable agglomerates which render impossible or greatly impede the practical filtration of the interpolymer particles, a tendency which becomes more pronounced with increasing vinyl ester content, is substantially diminished by adding an anti-coalescing amount of at least one water soluble alkanolamine processing aid to the aqueous dispersion media, or wash water used in recovery of the polymer particles prior to the recovery of the interpolymer particles therefrom. While in the alkanolamine-wet condition, the ethylene-vinyl ester interpolymer filter cake continues to resist coalescence and as such constitutes an excellent starting material for the preparation of hydrolyzed ethylene-vinyl ester resins by solid phase alcoholysis.

REFERENCES:
patent: 2013941 (1935-09-01), Young
patent: 2388225 (1945-10-01), Brooks
patent: 3634385 (1972-01-01), Walles
patent: 4078128 (1978-03-01), Hoyt

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