Process for the production of poly-N-vinylpyrrolidone granules c

Details Process for the production of poly-N-vinylpyrrolidone granules c Process for the production of poly-N-vinylpyrrolidone granules c

1975-11-25

1977-07-26

Michl, Paul R.

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

Synthetic resins

Treating polymer containing material or treating a solid...

424 80, 526 4, 528488, 528490, C08K 316

Patent

active

040384764

ABSTRACT:
Preparation of free-flowing granules of practically uniform composition and particle size consisting essentially of poly-N-vinylpyrrolidone and iodide (I.sup.-) by combining with uniform thorough mixing
A. a solution and/or colloidal suspension of a substance releasing iodide ions in a first solvent or solvent mixture, as well as
B. a solution and/or colloidal solution and/or suspension of PVP in a second solvent or solvent mixture which possesses a surface tension different from that of the first solvent or solvent mixture, and in which PVP is at least partially soluble or wettable, and in which the substance releasing iodide ions, contained in the first solvent or solvent mixture, is insoluble or only slightly soluble;
And separating and drying the granules formed.

REFERENCES:
patent: 2900305 (1959-08-01), Siggia
patent: 3028300 (1962-04-01), Cantor
patent: 3268071 (1966-08-01), Puddington
patent: 3898326 (1975-08-01), Cantor

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