ULTRAHIGH-MOLECULAR POLYETHYLENE FOAM AND PROCESS FOR PRODUCING THE SAME

Title:

ULTRAHIGH-MOLECULAR POLYETHYLENE FOAM AND PROCESS FOR PRODUCING THE SAME

Document Type and Number:

WIPO Patent Application WO/2005/035639

Kind Code:

A1

Abstract:

[PROBLEMS] To provide: a skinned foam which has a satisfactory appearance and to which functions such as lightweight properties, heat-insulating properties, sound-absorbing properties, a reduced permittivity, cushioning properties, and flexibility have been imparted without significantly reducing excellent properties inherent in ultrahigh-molecular polyethylene, such as wearing resistance, self-lubricity, impact resistance, low-temperature properties, and chemical resistance; and a process for stably producing the foam. [MEANS FOR SOLVING PROBLEMS] The foam is one which is obtained by foaming ultrahigh-molecular polyethylene having a viscosity-average molecular weight of 300,000 to 10,000,000 and which has a density of 0.02 to 0.7 g/cm³. The foam can be produced by adding, in an extruder, carbon dioxide to the ultrahigh-molecular polyethylene in a molten state and extruding and foaming the melt in such a manner that the resin residence time and pressure in the die part are specific values and that the surface temperature and central-part temperature of the resin immediately after ejection from the die are given values.

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Inventors:

NISHIKAWA SHIGEO (JP)
ARIMOTO MASASHI (JP)
ERIGUCHI MICHIO (JP)

Application Number:

PCT/JP2004/014931

Publication Date:

April 21, 2005

Filing Date:

October 08, 2004

Export Citation:

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Assignee:

MITSUI CHEMICALS INC (JP)
NISHIKAWA SHIGEO (JP)
ARIMOTO MASASHI (JP)
ERIGUCHI MICHIO (JP)

International Classes:

B29C48/07; B29C48/08; B29C48/09; B29C48/90; C08J9/12; (IPC1-7): C08J9/04; B29C47/78

Foreign References:

JPH11335480A	1999-12-07
JPS54112970A	1979-09-04
JPH08504856A	1996-05-28
JPS5883006A	1983-05-18

Other References: