Polymeric microspheres

a polymer and microsphere technology, applied in the field of microsphere particles, can solve the problems of restricting the use of such particles, difficult to achieve, and control the thickness of the shell, and achieve the effect of increasing the strength and durability of the polymeric shell

Inactive Publication Date: 2009-09-17
TUFTS UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Benefits of technology

[0011]The nature of the polymeric shell is varied to accommodate various uses of the hollow microspheres. The microsphere shell typically contains styrene, methacrylate, or any polymer with a high glass-transition temperature (Tg). The shell contains a polymer resulting from the polymerization of one or more monomers selected from the group consisting of acrylonitrile, styrene, benzyl methacrylate, phenyl methacrylate, ethyl methacrylate, divinyl benzene, 2-hydroxyethyl methacrylate, cycloh

Problems solved by technology

However, the formation of uniform and regular shell structures, as well as control over the shell thi

Method used

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Examples

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Embodiment Construction

[0039]Hollow polymer microspheres were prepared by coating silica microsphere templates with poly(benzyl methacrylate) using surface initiated controlled / living radical polymerization and subsequently removing the core by chemical etching. Shell thickness was controlled by varying the polymerization time. Scanning electron microscopy was used to characterize the products and demonstrate that the polymer microspheres were hollow. FTIR spectroscopy showed that the silica cores were completely removed by etching.

Surface Confined Living Radical Polymerization: A New Method for Preparing Hollow Polymer Microspheres on Silica Templates.

[0040]Uniform hollow polymeric microspheres were made by using surface confined living radical polymerization. Using the silica microsphere as a sacrificial core, hollow microspheres were produced following core dissolution. First, a controlled / living polymerization was conducted using an initiator attached to the surface of silica microparticles to initiat...

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Abstract

The invention features core-shell microsphere compositions, hollow polymeric microspheres, and methods for making the microspheres. The microspheres are characterized as having a polymeric shell with consistent shell thickness.

Description

[0001]This application is a divisional application of, and claims priority to, U.S. patent application Ser. No. 10 / 823,367, filed Apr. 12, 2004, which is a continuation of U.S. patent application Ser. No. 10 / 033,389, filed Oct. 25, 2001, now U.S. Pat. No. 6,720,007, which claims priority to U.S. provisional application 60 / 243,104, filed Oct. 25, 2000. The entire contents of each of the aforementioned applications is incorporated herein by reference.STATEMENT AS TO FEDERALLY-SPONSORED RESEARCH[0002]This invention was made with government support under grant number GM48142 awarded by the National Institutes of Health, grant number DE-AC05-000R22725 awarded by the Department of Energy, and DAAK60-97K-9502 awarded by the U.S. Army. The U.S. government has certain rights in the invention.BACKGROUND OF THE INVENTION[0003]The invention relates to microsphere particles.[0004]Hollow microsphere particles have a wide variety industrial and biomedical uses. However, the formation of uniform an...

Claims

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Application Information

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IPC IPC(8): A61K9/14A61K39/395A61K9/50A61K9/51B01J13/02B01J13/14
CPCA61K9/5089A61K9/5138Y10T428/2982B01J13/02B01J13/14A61K9/5146
Inventor WALT, DAVID R.MANDAL, TARUN K.FLEMING, MICHAEL S.
Owner TUFTS UNIV
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