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. 30, 2006
Filed:
Feb. 22, 2005
Jun Tian, La Porte, TX (US);
David Rauscher, Angleton, TX (US);
William Gauthier, Houston, TX (US);
Mark C. Douglass, League City, TX (US);
Nelson Black, Pasadena, TX (US);
Ronald Tharappel, Missouri City, TX (US);
Jun Tian, La Porte, TX (US);
David Rauscher, Angleton, TX (US);
William Gauthier, Houston, TX (US);
Mark C. Douglass, League City, TX (US);
Nelson Black, Pasadena, TX (US);
Ronald Tharappel, Missouri City, TX (US);
Fina Technology, Inc., Houston, TX (US);
Abstract
The tendency of copolymer fluff grains of propylene and ethylene to agglomerate is reduced by injecting at least one olefin comonomer, such as ethylene monomer, into more than one point along the length of the reactor, rather than injecting all of the ethylene at one point. This process reduces the tendency of copolymer fluff grains to agglomerate and cause processing problems as compared with injecting the comonomer at only one point. Copolymer made by this process is expected to have lower substantially amorphous polypropylene content and better organoleptics than copolymer made where the ethylene is injected at only one point. In one non-limiting embodiment the copolymerization reactor is a loop-type reactor.