The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Apr. 30, 1991
Filed:
Jun. 06, 1988
Unilever Patent Holdings B.V., Rotterdam, NL;
Abstract
Porous spheroidal silica having a particle size in the range 1 to 400 microns, axial ratios of 1:1 to 1:12 has up to 50% by weight of the SiO.sub.2 of included material, such as for example perfumes, flavoring materials, pigments, germicides, bactericides, fungicides, bleaching agents, skin benefit agents, therapeutic agents, dispersed in the silica as particles or droplets in the size range 0.01 to 10 .mu.m. The spheroids can be made by mixing together an aqueous, stabilized silica sol containing dispersed therein up to 50% by weight of the silica of an included material and an aqueous solution of a non-adsorbing polymer to form a phase separated system comprising silica droplets containing included material in a polymer-rich continuous phase and condensing the silica sol to aggregate the droplets to form silica spheroids containing the dispersed included material. The included material can be released in use by e.g. wetting, attrition, dissolution, pH change, heating.