COMPOSITE TUBULAR ARTICLE AND ITS PRODUCTION METHOD

Title:

COMPOSITE TUBULAR ARTICLE AND ITS PRODUCTION METHOD

Document Type and Number:

WIPO Patent Application WO/1991/001220

Kind Code:

A1

Abstract:

This invention relates to a composite tubular article used as a belt which is suitable for fixation on an image forming apparatus such as a duplicating machine, particularly for heat fixation, and to its production method. Conventionally, a belt having a polyimide resin on the inner layer and a fluororesin on the outer layer is known as an image fixing belt but this belt involves the problems that a clear and vivid image cannot be obtained because the thickness of each layer is not uniform and a lusterless or so-called 'mat' image cannot be obtained due to a smooth belt surface. To solve the problems with the prior art technique described above, the present invention provides a composite tubular article consisting of a tubular inner layer made of a polyimide resin and a tubular outer layer made of a fluororesin, whereby surface coarseness of the outer peripheral surface of the fluororesin tubular outer layer is from 1 to 10 $g(m)m. As the production method of this article, the present invention provides a method which comprises forming the outer layer by use of a cylinder having an inner peripheral surface having surface coarseness of 1 to 10 $g(m)m and forming the polyimide resin tubular inner layer on its inner peripheral surface by imidation of a polyamidic acid, or a method which comprises dipping the inner layer formed by the imidation of the polyamidic acid in a fluororesin solution in which particles having a particle diameter of up to 5 $g(m)m are dispersed or spraying the solution to the inner layer to form the outer layer.

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Inventors:

NAKAJIMA TOSHIO (JP)
KANETO MASAYUKI (JP)
TOMITA TOSHIHIKO (JP)
FUJITA TOKIO (JP)
ISHIZAKA HITOSHI (JP)
HARADA CHIAKI (JP)
UEMURA GOSEI (JP)

Application Number:

PCT/JP1990/000941

Publication Date:

February 07, 1991

Filing Date:

July 20, 1990

Export Citation:

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Assignee:

NITTO DENKO CORP (JP)

International Classes:

B29C41/22; B29D23/00; B29D99/00; G03G5/10; G03G15/20; (IPC1-7): B29C41/08; B32B27/30; B32B27/34; B41J3/20; B41M5/40; C08J7/04; G03G5/14

Foreign References:

JPS6195361A	1986-05-14
JPH01139228A	1989-05-31
JPS60992A	1985-01-07
JPS5878784A	1983-05-12
JPS5953541A	1984-03-28

Other References: