Reheis, Inc.

Reheis Chemical Company, Inc.

Rudolph Ferentchak

James F Kozischek

Jerome E Schwartz

Antiperspirant formulations are provided in which water-immiscible adjuvants are encapsulated in thick-walled, hollow, substantially spherical particles of antiperspirant active, which is preferably a water-soluble compound or complex of a polyvalent metal or metals. The thick-walled particles resist rupture during normal handling and application of the antiperspirant formulation and provide slow release of the encapsulated adjuvant when the antiperspirant shell dissolves in perspiration. The adjuvant may be a fragrance, an antibacterial, antimicrobial or antifungal agent, a deodorant, or other dermatological preparation. The encapsulation is accomplished by emulsifying the adjuvant in an aqueous solution of the antiperspirant active, and spray drying the material in such a manner as to produce thick-walled, spherical particles with the liquid adjuvant in the hollow centers.

Encapsulation of adjuvants within antiperspirant actives

Spray dried thermosetting resin powders in an intermediate polymeric stage are produced in the form of hollow, thick-walled, macrospherical particles having a bulk density greater than about 35 lbs/ft.sup.3 and having particle diameters predominantly in the range of about 10 to 74 microns, preferably averaging about 30 microns in diameter with greater than 90% of the particles being in the 10 to 74 micron range. The powder is produced by centrifugal atomization of a concentrated resin solution through a porous sintered metal filter in a spray drying chamber, preferably without diluting or preheating the solution and without heating the resinous material above about 160.degree. F. during spray drying. The particles are advantageously used in the dry process molding of consolidated wood fiber structures, such as waferboard and chipboard, in which wood fiber elements mixed with the resin powder are consolidated under heat and pressure sufficient to cause the powder to melt, flow and cure.

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New Providence, NJ, United States of America

Rudolph Ferentchak