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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.:

US 11491090 B1

PDFFull Text
Date of Patent:
Nov. 08, 2022

Filed:

Oct. 04, 2017

Spherical microparticles with polyester walls

Applicant:

Basf SE, Ludwigshafen am Rhein, DE;

Inventors:

Ewelina Burakowska-Meise, Ludwigshafen am Rhein, DE;

Wolfgang Krause, Ludwigshafen am Rhein, DE;

Patrick Leibach, Ludwigshafen am Rhein, DE;

Karl Kolter, Ludwigshafen am Rhein, DE;

Assignee:

BASF SE;

Attorney:

Faegre Drinker Biddle & Reath LLP

Primary Examiner:

Tigabu Kassa

Assistant Examiner:

Ivan A Greene

Int. Cl.
CPC ...
A61K 8/11 (2006.01); A61K 9/50 (2006.01); C08L 67/03 (2006.01); A61Q 5/02 (2006.01); A61Q 13/00 (2006.01); A61K 8/85 (2006.01); A61Q 19/10 (2006.01); C11D 3/50 (2006.01); B01J 13/06 (2006.01); B01J 13/20 (2006.01); B01J 13/02 (2006.01); A61K 8/06 (2006.01); A61K 8/81 (2006.01); A61K 8/87 (2006.01); A61K 9/00 (2006.01);
U.S. Cl.
CPC ...
A61K 8/11 (2013.01); A61K 8/068 (2013.01); A61K 8/8111 (2013.01); A61K 8/8152 (2013.01); A61K 8/85 (2013.01); A61K 8/87 (2013.01); A61K 9/5031 (2013.01); A61K 9/5089 (2013.01); A61Q 5/02 (2013.01); A61Q 13/00 (2013.01); A61Q 19/10 (2013.01); B01J 13/02 (2013.01); B01J 13/06 (2013.01); B01J 13/206 (2013.01); C11D 3/505 (2013.01); A61K 9/007 (2013.01);
Abstract

The present invention relates to compositions of spherical microparticles composed of a wall material and at least one cavity that comprises a gas and/or a liquid, which have pores on the surface thereof, wherein the spherical microparticles have a mean particle diameter of 10-600 μm and wherein at least 80% of those microparticles, the particle diameter of which does not deviate from the mean particle diameter of the microparticles of the composition by more than 20%, each have on average at least 10 pores, the diameter of which is in the range from 1/5000 to ⅕ of the mean particle diameter, and, furthermore, the diameter of each of these pores is at least 20 nm, wherein the wall material consists of a composition comprising at least one aliphatic-aromatic polyester, and the wall material has a solubility at 25° C. of at least 50 g/l in dichloromethane, a method for the preparation thereof and also the use thereof.

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