POLYETHYLENE RESIN AND PIPE AND JOINT USING THE SAME

Title:

POLYETHYLENE RESIN AND PIPE AND JOINT USING THE SAME

Document Type and Number:

WIPO Patent Application WO/2002/036644

Kind Code:

A1

Abstract:

A linear polyethylene which is produced by the use of a Ziegler-Natta catalyst and satisfies the requirements described in the following (1) to (6): 0.20 to 0.50 g/10 minutes in terms of a melt flow rate (190 °C, load: 5.00 kg), 0.948 to 0.952 g/cm?3¿ in terms of a density, 65 to 130 in terms of a flow ratio (FR), 1.90 x 10?-8¿dyn/cm?2¿ or less in terms of a relaxation parameter H as determined by the stress relaxation measurement, 39 to 45 wt % in terms of the proportion (WH) of the amount of high molecular weight components integrated over all the elution temperature divisions to the total amount of the polyethylene eluted, as determined by the cross fractionation method (TREF-SEC), and 96.5 °C or lower in terms of a peak temperature (TH) of the elution curve for the high molecular weight component of the polyethylene and 99.2 °C or lower in terms of peak temperature (TL) of the elution curve for the low molecular weight component thereof, both being determined by the cross fractionation method; and a pipe and a joint using the polyethylene.

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Inventors:

MIZUNO YASUHISA (JP)
KASHIWAGI YASUHIRO (JP)
YOSHIKIYO TETSUYA (JP)
SAKATA KAZUYA (JP)

Application Number:

PCT/JP2000/007666

Publication Date:

May 10, 2002

Filing Date:

October 31, 2000

Export Citation:

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Assignee:

JAPAN POLYCHEM CORP (JP)
MIZUNO YASUHISA (JP)
KASHIWAGI YASUHIRO (JP)
YOSHIKIYO TETSUYA (JP)
SAKATA KAZUYA (JP)

International Classes:

F16L11/06; C08F10/02; F16L9/12; F16L47/00; C08F110/02; (IPC1-7): C08F10/02; F16L9/12

Domestic Patent References:

WO1997020868A1

1997-06-12

Foreign References:

JPH0967413A	1997-03-11
JP2000109521A	2000-04-18
JP2000017018A	2000-01-18
JPH08301933A	1996-11-19

Attorney, Agent or Firm:

Miyakoshi, Noriaki (29th floor 12-32, Akasaka 1-chome Minato-ku Tokyo, JP)

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