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. 14, 2003
Filed:
May. 16, 1997
Grant B. Jacobsen, Houston, TX (US);
Fumio Matsushita, Kurashiki, JP;
Lee Spencer, Pearland, TX (US);
Peter L. Wauteraerts, Ost Ham, BE;
Dow Global Technologies Inc., Midland, MI (US);
Abstract
Disclosed is a novel ethylene copolymer by copolymerizing an ethylene and at least one comonomer selected from a compound represented by the formula H C═CHR wherein R is an alkyl group or an aryl group, and a diene, by slurry polymerization process in the presence of a solid catalyst system comprising a support, a transition metal compound and an activator capable of converting the transition metal compound into a catalytically active transition metal complex. The produced copolymer has a density of from 0.870 to 0.980 and a molecular weight distribution (M /M ) of from 3 to 10, and exhibiting GPC/FT-IR characteristics and CFC characteristics, both of which define a comonomer content distribution, wherein, in one aspect, the lower the molecular weight of a copolymer fraction in a molecular weight distribution of an ethylene copolymer, the lower the comonomer content of the copolymer fraction; and, in the other aspect, the higher the molecular weight of a copolymer fraction, the higher the comonomer content of the copolymer fraction, so that ethylene copolymer exhibits high impact strength and excellent ESCR properties. Further, the ethylene copolymer contains substantially no impurites such as a wax, a gel and the like. Thus, the ethylene copolymer and blend compositions therefrom can be advantageously used for the production of film, fibers, foams or sheets including blown film, cast films, laminate films, blow-molded articles, injection molded articles, pipes, coating materials for cables, and the like.