FILTER MEDIUM AND CIGARETTE FILTER MADE WITH THE USE OF THE SAME

Title:

FILTER MEDIUM AND CIGARETTE FILTER MADE WITH THE USE OF THE SAME

Document Type and Number:

WIPO Patent Application WO/1997/005790

Kind Code:

A1

Abstract:

A filter medium comprising a tow of cellulose acetate fibers which contains 5 to 50 % by weight of water-soluble substances and/or water-dispersible substances soluble in a solvent for cellulose acetate and incompatible with cellulose acetate. The water-soluble substances and/or water-dispersible substances thus contained in the tow are separated and exuded from the fibers in the presence of water. As a result, the surface of each fiber becomes porous and the surface area of the fiber is enlarged. Thus, the configuration of the tow can easily be broken, which facilitates the degradation thereof by microorganisms, etc. A cigarette filter produced by using the filter medium has a high degradability in the natural environment, in particular, in a highly humid atmosphere, in water, etc.

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Inventors:

ITO KATSUTAKA (JP)
MATSUMOTO TSURUYOSHI (JP)
TOKIDA ATSUSHI (JP)
SHIBATA TETSURO (JP)
YAMASHITA YOICHIRO (JP)

Application Number:

PCT/JP1996/002178

Publication Date:

February 20, 1997

Filing Date:

August 02, 1996

Export Citation:

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Assignee:

MITSUBISHI RAYON CO (JP)
JAPAN TOBACCO INC (JP)
ITO KATSUTAKA (JP)
MATSUMOTO TSURUYOSHI (JP)
TOKIDA ATSUSHI (JP)
SHIBATA TETSURO (JP)
YAMASHITA YOICHIRO (JP)

International Classes:

A24D3/04; A24D3/10; (IPC1-7): A24D3/10; A24D3/14; A24D3/04; B01J20/24

Foreign References:

JPH05505106A	1993-08-05
JPH0799959A	1995-04-18
JPH07500385A	1995-01-12
JPH0776632A	1995-03-20

Other References: