Cleaning compositions for solid surfaces – auxiliary compositions – Cleaning compositions or processes of preparing – For cleaning a specific substrate or removing a specific...
Reexamination Certificate
2001-12-10
2003-12-02
Ogden, Necholus (Department: 1751)
Cleaning compositions for solid surfaces, auxiliary compositions
Cleaning compositions or processes of preparing
For cleaning a specific substrate or removing a specific...
C510S147000, C510S152000, C510S421000, C510S481000
Reexamination Certificate
active
06656893
ABSTRACT:
FIELD OF THE INVENTION
The present invention relates to a transparent bar soap composition which is obtainable without the aging process after forming.
BACKGROUND OF THE INVENTION
To manufacture a transparent bar soap by a framing method, the following ingredients and process have been traditionally utilized. Namely, fatty acids or fats/oils are dissolved in a lower alcohol such as ethanol. In the next-step, sodium hydroxide was added for neutralization or saponification. Then, humectants like sugar, sorbitol and glycerin are blended and dissolved therein. Where necessary, colorants, fragrances, medicinal ingredients, plant extracts, etc. are added and dissolved as well. This mixture is poured into a given frame, cooled to solidify, and then cut into a certain form. The formed products are aged in order to let volatile components evaporate, until the weight of these products is reduced to a predetermined degree. Finally, the aged products are re-shaped and packaged for commercial distribution.
In this traditional soap-making method, the aging process imparts some advantages to the formed product. For example, the formed product acquires appropriate hardness through the aging process. Besides, the aged product shows a remarkable storage stability, because it does not sweat (i.e. no liquid appears on its surface like sweat) even when stored under severe conditions of high temperature and high humidity. In addition, as for a half-used product, the surface is less likely to turn cloudy.
Nevertheless, the conventional soap-making method requires an extensive aging period which depends on the weight of a formed product. For example, a 100-gram product needs an aging period of as long as about 60 days. In addition, the products to be aged occupy a vast space. Under these circumstances, the time-consuming aging process has hampered efficient production of transparent bar soaps, raising the price to a relatively expensive range.
In the meantime, many attempts have been made to produce transparent bar soaps with a shorter aging period. By way of example, Japanese Patent Laid-open Publication No. S63-275700 discloses a method for continuously producing a transparent bar soap, without using a lower alcohol which has to evaporate in the aging process. From another point of view, Japanese Patent Laid-open Publication No. H11-106307 discloses an improved method for enhancing storage stability of triethanolamine which is added as a neutralizing agent. In this disclosure, a sulfite or the like is blended as a reducing agent. Further, Japanese Patent Laid-open Publication No. H11-124598 discloses a transparent bar soap composition which is efficiently produced by a milling method.
However, as for the production method of Japanese Patent Laid-open Publication No. S63-275700, while the bar soap is stored for a long period, triethanolamine used as the neutralizing agent deteriorates due to oxidation, only to damage the commercial value of the bar soap. Regarding the sweating and clouding phenomenon as mentioned above, this bar soap is likely to sweat during storage, particularly under severe environmental conditions of high temperature and high humidity. In addition, a half-used bar soap suffers from clouding.
In the case of Japanese Patent Laid-open Publication No. H11-106307, it fails to give a satisfactory solution to the above-mentioned problems, despite the incorporation of a sulfite or the like as a reducing agent.
Regrettably, the milled bar soap composition, obtained in Japanese Patent Laid-open Publication No. H11-124598, lacks sufficient transparency.
Bearing these problems in mind, the present invention aims to provide a transparent bar soap composition which can be produced at a high production efficiency, without the aging process indispensable for conventional soap-making methods. The present invention also aims to provide a transparent bar soap composition which is superior in transparency, storage stability and hardness. The present invention further aims to provide a transparent bar soap composition which neither suffers from sweating under the conditions of high temperature and high humidity, nor turns cloudy in the course of use.
SUMMARY OF THE INVENTION
In order to achieve the above objects, the present inventors have made intensive investigations and completed the present invention.
Namely, the present invention relates to a transparent bar soap composition comprising:
a sodium salt of a fatty acid, or a mixed sodium/potassium salt of a fatty acid;
at least one amphoteric surfactant selected from the group consisting of compounds represented by following formulas (A) to (C),
wherein R
1
represents an alkyl group having 7 to 21 carbon atoms or an alkenyl group having 7 to 21 carbon atoms, n and m independently represent an interger from 1 to 3, and Z represents a hydrogen atom or (CH
2
)
p
COOY, wherein p represents an interger from 1 to 3, and Y represents an alkali metal, an alkaline earth metal or an organic amine,
wherein R
2
represents an alkyl group having 7 to 21 carbon atoms or an alkenyl group having 7 to 21 carbon atoms, R
3
and R
4
independently represent a lower alkyl group, and A represents a lower alkylene group, and
wherein R
5
represents an alkyl group having 8 to 22 carbon atoms or an alkenyl group having 8 to 22 carbon atoms, and R
6
and R
7
independently represent a lower alkyl group;
a nonionic surfactant; and
at least one glycerin derivative.
The above-mentioned transparent bar soap composition may comprise 20 to 40% by weight of the sodium salt of a fatty acid or the mixed sodium/potassium salt of a fatty acid, 2 to 10% by weight of the amphoteric surfactant, 2 to 15% by weight of the nonionic surfactant, and 1 to 10% by weight of the glycerin derivative.
In the transparent bar soap composition of the present invention, the molar ratio of sodium to potassium in the mixed sodium/potassium salt of a fatty acid may be from 10/0 to 7/3.
In the transparent bar soap composition of the present invention, the glycerin derivative may be at least one member selected from the group consisting of polyoxypropylene glyceryl ether, polyoxypropylene diglyceryl ether, polyoxypropylene polyglyceryl ether, polyoxyethylene polyoxypropylene glyceryl ether, polyoxyethylene polyoxypropylene diglyceryl ether, and polyoxyethylene polyoxypropylene polyglyceryl ether.
REFERENCES:
patent: 5154849 (1992-10-01), Visscher et al.
patent: 5496489 (1996-03-01), Dussault et al.
patent: 0 294 010 (1988-12-01), None
patent: 0 426 984 (1991-05-01), None
patent: 63-275700 (1988-11-01), None
patent: 11-106307 (1999-04-01), None
patent: 11-124598 (1999-05-01), None
Kim Myong Kon; Abstract for KR 9 511 401 B; Oct. 2, 1995.
Kishi Nobuyuki
Nagahama Daiji
Nishina Tetsuo
Saito Yoshinobu
Birch & Stewart Kolasch & Birch, LLP
Ogden Necholus
Shiseido Honecake Industry Co., Ltd.
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