Deodorizing material and process for producing the same: cellulo

Details Deodorizing material and process for producing the same: cellulo Deodorizing material and process for producing the same: cellulo

1989-12-13

1991-09-17

Clingman, A. Lionel

Bleaching and dyeing; fluid treatment and chemical modification

Chemical modification of textiles or fibers or products thereof

Cellulose fibers

811568, 811569, 81161, 8624, 8629, D06M 1503, D06M 2100, D21H 522, A61L 901

Patent

active

050491598

DESCRIPTION:

BRIEF SUMMARY
FIELD OF THE INVENTION

The present invention relates to a deodorizing material useful for the removal of malodorous substances which are present in rooms, refrigerators, etc. or under various environment and to a process for producing the same.


BACKGROUND OF THE INVENTION

As deodorizing materials for removing malodorous substances, such as ammonia, methyl mercaptan, methyl sulfide dimethyl disulfide, hydrogen sulfide and trimethylamine, which are present in rooms, refrigerators, etc., there have hitherto been proposed those consisting mainly of activated carbon; those consisting of fibers or the like to which phthalocyanine complexes are attached; and those consisting of a carboxymethylated cellulose on which copper and/or zinc ions are adsorbed.
However, deodorants consisting mainly of activated carbon are in the form of granules, and they are colored in black. Therefore, the deodorants so employed are contained in a good-looking package. This results in bulkiness and poses various constraints on their use.
Deodorants consisting of fibers, such as celluloses, to which phthalocyanine complexes are attached are slow in the speed of deodorization and hence their deodorizing capability is insufficient from practical point of view.
Deodorants comprising carboxymethylated cellulose fibers on which copper and/or zinc ions are adsorbed could hardly be said to be a practical deodorizer since the ions are adsorbed thereon in only small quantities.
There has also been reported cellulose fibers dipped in a concentrated alkali solution of a copper compound to attain an increase in the quantity of ions adsorbed thereon. However, cellulose fibers so treated are severely damaged by the strong alkali and hence become unsatisfactory in workability, processability and other practical properties.
It has therefore been desired to develop a deodorizing material which is excellent in processability and exhibits excellent deodorizing properties.


SUMMARY OF THE INVENTION

As a result of intensive investigations, it has now been found that copper hydroxide and/or zinc hydroxide can be effectively attached to and fixed on cellulose fibers under certain conditions and that the fixed fibers so obtained exhibit excellent deodorizing effects against a wide range of malodorous substances, and the present invention has been accomplished on the basis of the finding.
Accordingly, the present invention is concerned with:
1) A process for producing deodorizing fibers, which is characterized in that copper hydroxide and/or zinc hydroxide is attached to cellulose fibers in a colloidal state and fixed thereon.
2) A process for producing deodorizing fibers as described in 1), wherein an alkaline substance is added to an aqueous solution of a water-soluble copper compound and/or a water-soluble zinc compound in which cellulose fibers are dispersed, so as to form colloid of copper hydroxide and/or zinc hydroxide and to fix the copper hydroxide and/or zinc hydroxide on said cellulose fibers through contact between them.
3) A process for producing deodorizing fibers as described in 1), wherein an alkaline substance is added to an aqueous solution of a water-soluble copper compound and/or a water-soluble zinc compound to form colloid of copper hydroxide and/or zinc hydroxide, and then cellulose fibers are charged and dispersed into the colloidal solution to fix the copper hydroxide and/or zinc hydroxide on the fibers through contact between them.
4) A process for producing deodorizing fibers as described in 1), wherein said cellulose fibers are treated with an acid before being dispersed into said aqueous solution of a water-soluble copper compound and/or a water-soluble zinc compound.
5) A process for producing deodorizing fibers as described in 1), wherein said cellulose fibers are dipped in an aqueous solution of chitosan before being dispersed into said aqueous solution of a water-soluble copper compound and/or zinc compound.
6) Deodorizing fibers consisting of cellulose fibers on which copper hydroxide and/or zinc hydroxide is attached and

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