Drug – bio-affecting and body treating compositions – Deodorants
Reexamination Certificate
2000-05-03
2003-04-29
Page, Thurman K. (Department: 1615)
Drug, bio-affecting and body treating compositions
Deodorants
C424S076500, C424S076600, C424S076700
Reexamination Certificate
active
06555102
ABSTRACT:
BACKGROUND OF THE INVENTION
a) Field of the Invention
This invention relates to deodorant and antimicrobial compositions, deodorant and antimicrobial resin compositions making use of the deodorant and antimicrobial compositions, and formed deodorant and antimicrobial resin products obtained by molding or otherwise forming the resin compositions. Described more specifically, the present invention is concerned with deodorant and antimicrobial compositions useful for imparting deodorizing power and antimicrobial activity to various base materials such as paints, synthetic fibers, synthetic resins and paper, deodorant and antimicrobial resin compositions making use of the deodorant and antimicrobial compositions, and formed deodorant and antimicrobial resin products obtained by molding or otherwise forming the resin compositions.
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 to remain free of offensive odor, bacteria, fungi and the like. If offensive odor, bacteria, fungi or the like occurs, a need often arises for its removal.
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 and olfactory unpleasant feeling and hygienically unpleasant feeling, such as microbial contamination, 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, clothing, sundries and films—are hence required to have a function to remove the odor of formaldehyde given off as described above. Further, from the view point of hygine such as prevention of microbial contamination, 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 composition 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 composition comprising an oxide or hydroxide of an alkaline earth metal, hydrated silica and a cationic surfactant; a deodorant and antimicrobial resin composition making use of the deodorant and antimicrobial composition, and also a formed deodorant and antimicrobial resin product obtained by molding or otherwise forming the resin composition.
The deodorant and antimicrobial composition, deodorant and antimicrobial resin composition and formed deodorant and antimicrobial resin product according to the present invention are effective for the deodorization of acetoaldehyde odor, formaldehyde odor, acetic acid odor and the like out of various offensive odors. Further, the deodorant and antimicrobial composition, deodorant and antimicrobial resin composition and formed deodorant and antimicrobial resin product according to the present invention are also excellent in antimicrobial activity.
In addition, the deodorant and antimicrobial composition, deodorant and antimicrobial resin composition and formed deodorant and antimicrobial resin product according to the present invention can impart excellent deodorizing power and antimicrobial activity to various articles.
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 composition 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 composition 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 various offensive odor components such as formaldehyde.
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 composition 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 the deodorant and antimicrobial composition according to the present invention is kneaded with a resin, the flowability of the resin is rendered poor.
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 125BN”, “Duspar 125BS” 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 mixed to produce deodorant and antimicrobial compositions, may not be sufficient in dispersibility, stability, thermal stability, light fast
Hayashi Kozaburo
Hoshino Akira
Saji Mikio
Dainichiseika Color & Chemicals Mfg. Co. Ltd.
Page Thurman K.
Tran S.
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