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:
May. 24, 2011
Filed:
Dec. 29, 2008
John David Finch, North Wales, PA (US);
Biwang Jiang, Warrington, PA (US);
Aaron Sarafinas, Ivyland, PA (US);
Andrew M. Savo, Cherry Hill, NJ (US);
John David Finch, North Wales, PA (US);
Biwang Jiang, Warrington, PA (US);
Aaron Sarafinas, Ivyland, PA (US);
Andrew M. Savo, Cherry Hill, NJ (US);
Rohm and Haas Company, Philadelphia, PA (US);
Abstract
A method for preparing monodisperse crosslinked bead polymers by introducing droplets having a harmonic mean size from 50 to 1500 microns and comprising at least one monomer, at least one crosslinker and a free-radical polymerization initiator into an aqueous medium through orifices to produce an aqueous suspension of droplets having a volume fraction of droplets from 35 to 64%; wherein the droplets are not encapsulated; causing the aqueous suspension of droplets to flow in a downward direction in a pipe in which the temperature is maintained at least 20° C. below the temperature at which the polymerization initiator has a half-life of 1 hour; and polymerizing the droplets in a reactor.