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Spray drying of polymer-containing dispersions, water-in-oil emulsions and water-in-oil microemulsions, and dry polymer products formed thereby
| Details |
Inventors: Davies, William Bloor; Healy, John Edward; Miller, Gary Kaui Lani; Kozakiewicz, Joseph J.; Ryles, Roderick G.;
Assignee: Cytec Technology Corp. (Wilmington, DE)
Primary Examiner: Yoon; Tae
Assistant Examiner:
Attorney, Agent or Firm: Mallon; Joseph J., Schultz; Claire M.
Processes for spray drying water-soluble and water-swellable vinyl-addition polymer-containing dispersions, emulsions and microemulsions to obtain substantially dry water-soluble or water-swellable polymer particles, compositions of substantially dry water-soluble or water-swellable polymer particles, methods of agglomerating spray-dried polymer particles, and methods of using spray-dried polymer particles and agglomerates in water-treating, mining, paper, food processing, soil conditioning, solution thickening, biotechnological, and oil recovery applications are disclosed. |
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DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS In accordance with the instant invention, vinyl-addition polymer-containing dispersions, water-in-oil emulsions, and water-in-oil microemulsions are sprayed-dried by a suitable means into a large chamber through which a hot gas is blown, thereby removing most or all of the volatiles and enabling the recovery of the dried polymer.
Surprisingly, the means for spraying the dispersion, water-in-oil emulsion, or water-in-oil microemulsion into the gas stream are not particularly critical and are not limited to pressure nozzles having specified orifice sizes; in fact, any known spray-drying apparatus may be used.
For instance, means that are well known in the art such rotary atomizers, pressure nozzles, pneumatic nozzles, sonic nozzles, etc.
can all be used to spray-dry the dispersion, water-in-oil emulsion, or water-in-oil microemulsion into the gas stream.
The feed rate, feed viscosity, desired particle size of the spray-dried product, droplet size of the dispersion, water-in-oil emulsion, or water-in-oil microemulsion, etc.
are factors which are typically considered when selecting the spraying means.
The size and shape of the chamber, the number and type of spraying means, and other typical operational parameters may be selected to accommodate dryer conditions using common knowledge of those skilled in the art.
Although open cycle spray-dryers may be used, closed cycle spray-drying systems are preferred.
Gas flow may be cocurrent, countercurrent or mixed flow, cocurrent flow being preferred.
The hot gas, or inlet gas, may be any gas that does not react or form explosive mixtures with the feed and/or spray-dried polymer.
Suitable gases used as the inlet gas are gases known to those skilled in the art, including air, nitrogen, and other gases which will not cause undesirable polymer degradation or contamination, preferably gases containing about 20% or less oxygen, more preferably about 15% or less oxygen.
Most preferably, inert gases such as nitrogen, helium, etc
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Adhesives and Rubbers 
