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:
Jan. 28, 2003
Filed:
Feb. 14, 2002
Applicant:
Inventors:
Beth M. Steinmetz, Bryn Mawr, PA (US);
Robert M. Arrell, Quarryville, PA (US);
Assignee:
Arco Chemical Technology, L.P., Greenville, DE (US);
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
C08F 2/608 ;
U.S. Cl.
CPC ...
C08F 2/608 ;
Abstract
A two-step, base-catalyzed process for making crosslinked polyvinylpyrrolidone (PVP-P) having a low swell volume is disclosed. A crosslinker is generated “in situ” in the first step by heating a basic aqueous mixture containing a relatively low concentration of N-vinylpyrrolidone under added inert gas pressure. In a second step, the reactor temperature is reduced to initiate polymerization. The process is a productive way to make PVP-P that is easy to isolate and purify. The polymer has a swell volume less than about 40 mL H O/10 g polymer, which makes it valuable for beverage clarification.