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:
Oct. 08, 2002
Filed:
Jun. 23, 2000
Junji Saito, Yamaguchi, JP;
Keiji Okada, Yamaguchi, JP;
Kenichi Morizono, Yamaguchi, JP;
Makoto Mitani, Yamaguchi, JP;
Terunori Fujita, Yamaguchi, JP;
Mitsui Chemicals, Inc., Tokyo, JP;
Abstract
The present invention is intended to provide an ethylene copolymer having excellent mechanical properties and moldability, a process for preparing the copolymer, a resin composition containing the copolymer and uses thereof. The ethylene copolymer has the following properties: the copolymer comprises 90 to 99% by mol of ethylene constituent units and 1 to 60% by mol of C &agr;-olefin constituent units; the ratio (Mz/Mw) of a Z average molecular weight (Mz) to a weight-average molecular weight (Mw), each molecular weight being measured by GPC, is in the range of 10 to 30, and said ratio (Mz/Mw) and the ratio (Mw/Mn) of a weight-average molecular weight (Mw) to a number-average molecular weight (Mn), each molecular weight being measured by GPC, satisfy the relation (Mz/Mw)>(Mw/Mn); the intrinsic viscosity is in the range of 0.5 to 9 dl/g; the ratio (n* /n* ) of a melt viscosity (&eegr;* ) at a shear rate of 0.01 rad/sec, as measured at 190° C., to a melt viscosity (&eegr;* ) at a shear rate of 8 rad/sec, as measured at 190° C., and the intrinsic viscosity (&eegr;) satisfy the relation (&eegr;* /&eegr;* )≧0.893×(&eegr;)+1.0; and the absolute value of an activation energy (E ) of a shift factor of melt viscoelasticity is not more than 4×10 J/mol.K.