Deodorant and antimicrobial dispersions

Details Deodorant and antimicrobial dispersions Deodorant and antimicrobial dispersions

2000-05-03

2002-03-19

Dees, Jose′ G. (Department: 1616)

Drug, bio-affecting and body treating compositions

Inorganic active ingredient containing

Aluminum, calcium or magnesium element, or compound containing

C424S076100, C424S076800, C424S688000, C424S722000, C424S724000, C514S727000, C514S738000, C514S772300, C514S782000, C514S975000

Reexamination Certificate

active

06358537

ABSTRACT:

BACKGROUND OF THE INVENTION
a) Field of the Invention
This invention relates to deodorant and antimicrobial dispersions, and more specifically, to deodorant and antimicrobial dispersions useful by themselves as liquid deodorant and antimicrobial agents and useful for imparting deodorizing power and antimicrobial activity to various base materials such as paints, synthetic fibers, synthetic resins and paper.
b) Description of the Related Art
Numerous deodorant and antimicrobial agents have been used to date in various fields. In particular, a variety of products such as films, wall paper, decorated plywood, building materials, fibers, nonwoven fabrics and clothing are required neither to give off offensive odor nor to permit growth of bacteria, fungi and the like, that is, to have so-called deodorizing power and antimicrobial activity in many instances.
In recent years, there is an ever-increasing demand for the amenity of living space. In view of the crowding of houses due to urbanization and also of the living environment of a closed house or building structure constructed of concrete and aluminum sash windows, it has become an indispensable condition for clean-environment life that visual, olfactory and hygienic unpleasant feeling be removed.
Described specifically, formaldehyde-linked health disturbances have posed problems in recent years. The odor of formaldehyde has already become a social problem as “sick house syndrome” in a living environment of a closed house structure, especially in a newly-built house. This problem is attributed to formaldehyde given off from newly-developed building materials. Various products—such as wall paper, decorated plywood, building materials, fibers, nonwoven fabrics and clothing—are hence required to have a function to remove formaldehyde. Further, from the viewpoint of, such products are also required to be equipped with an antimicrobial and antifungal function.
SUMMARY OF THE INVENTION
An object of the present invention is, therefore, to provide a deodorant and antimicrobial dispersion which can impart excellent deodorizing power and antimicrobial activity to various materials.
The above-described object can be achieved by the present invention to be described subsequently herein. Namely, the present invention provides a deodorant and antimicrobial dispersion comprising a deodorant and antimicrobial component, a binder resin and an aqueous or oily liquid medium, wherein the deodorant and antimicrobial component comprises an oxide or hydroxide of an alkaline earth metal, hydrated silica, and a cationic surfactant.
The deodorant and antimicrobial dispersion can be obtained by dispersing the specific deodorant and antimicrobial component in the aqueous or oily liquid medium in which the binder resin is contained. The dispersion can be sprayed without causing contamination. Especially, the deodorant and antimicrobial dispersion can be preferably used for the a production of base paper for decorated facing plates, woven fabrics, base paper for wall paper, and the like, all of which are provided with deodorizing power and antimicrobial activity.
The deodorant and antimicrobial dispersion is effective for the deodorization of acetoaldehyde odor, formaldehyde odor, acetic acid odor and the like out of various offensive odors and also for the inhibition of growth of bacteria, fungi and the like. Further, the deodorant and antimicrobial dispersion according to the present invention can impart excellent deodorizing power and antimicrobial activity to various materials.
DETAILED DESCRIPTION OF THE INVENTION AND PREFERRED EMBODIMENTS
The present invention will next be described more specifically based on preferred embodiments.
The deodorant and antimicrobial component, which makes up the deodorant and antimicrobial dispersion according to the present invention, comprises, in combination, an oxide or hydroxide of an alkaline earth metal, hydrated silica, and a cationic surfactant. Illustrative of the alkaline earth metal oxide or hydroxide are the oxides and hydroxides of barium, calcium, magnesium and the like, with magnesium hydroxide being particularly effective.
This alkaline earth metal oxide or hydroxide may be used preferably in such a proportion that, when the total amount of the deodorant and antimicrobial component is supposed to be 100 parts by weight, it amounts to 80 to 40 parts by weight. A proportion of the alkaline earth metal oxide or hydroxide smaller than the above range leads to insufficient performance in that conversion of aldehydes, especially formaldehyde into formose becomes slower. On the other hand, a proportion of the alkaline earth metal oxide or hydroxide greater than the above range also leads to insufficient performance in that the proportion of a substance adapted to undergo an addition reaction with formaldehyde for the removal of formaldehyde, that is, the cationic surfactant in the composition decreases, thereby lowering the deodorizing reaction velocity of aldehydes and resulting in insufficient fast-acting property.
The hydrated silica for use in the present invention is represented by the empirical formula SiO
2
.nH
2
O, and is in the form of secondary particles formed as a result of flocculation of fine silica particles having many silanol groups on surfaces thereof. Such hydrated silica is a flocculate of ultrafine particles of hydrated silica, which is available from a reaction of sodium silicate with a mineral acid, and contains a number of voids between particles. These voids effectively act for the adsorption of offensive odor components. Upon production of deodorant and antimicrobial, decorated facing plates, these voids also contribute to improvements in the impregnation of the hydrated silica with a base material for the decorated facing plates, such as a melamine resin, polyester resin or urethane resin, which is used in the production.
Such hydrated silica is available, for example, from Mizusawa Industrial Chemicals, Inc., Tokyo, Japan under the trade names of “P-801”, “P-802”, “P-526”, “P-527”, “P-
603
”, “P-604”, “P-554A”, “P-73”, “P-78A”, “P-78D”, “P-78F”, “P-707”, “P-740”, “P-752”, “P-50”, “P-766”, “C-1”, “S-0”, “NP-8”, “P-802Y”, “P-832”, “P-87”, “P-363”, “C-002”, “C-402” and “C-484”, all of which are usable in the present invention.
The above-described hydrated silica may be used preferably in such a proportion that, when the total amount of the deodorant and antimicrobial component is supposed to be 100 parts by weight, it amounts to 50 to 10 parts by weight. A proportion of the hydrated silica smaller than the above range leads to insufficient performance in that the deodorizing reaction velocity of aldehydes becomes slower, resulting in insufficient fast-acting property. On the other hand, a proportion of the hydrated silica greater than the above range also leads to insufficient performance in that, when used in paints or the like, the paints and the like are provided with poor flowability and especially, with insufficient shelf stability.
As the cationic surfactant for use in the present invention, one represented by the empirical formula HO—R—NHCH
2
CH
2
OH in which R is a C
12
-C
14
alkylene group is preferred. The cationic surfactant reacts with an aldehyde group of formaldehyde or the like, thereby converting such an aldehyde compound into an odorless compound.
Such cationic surfactants are available from Miyoshi Oil & Fat Co., Ltd., Tokyo, Japan under the trade names of “Miyocol 368E”, “Miyocol QX-33N”, “Duspar 125B”, “Duspar 125B”, “Duspar 125B” and “Duspar 1400B”, all of which are usable in the present invention.
The above-described cationic surfactants can be used either singly or in combination. They, however, include some compounds which, when formed into dispersions, may not be sufficient in dispersibility, stability, thermal stability, light fastness, processability and/or the like. Upon using the deodorant and antimicrobial dispersion of this invention for various applications, heat resistance is also important in connection with processability. From this viewpoint, “Duspar

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