Drug – bio-affecting and body treating compositions – Preparations characterized by special physical form – Cosmetic – antiperspirant – dentifrice
Patent
1994-03-24
1995-09-05
Kishore, Gollamundi S.
Drug, bio-affecting and body treating compositions
Preparations characterized by special physical form
Cosmetic, antiperspirant, dentifrice
424 701, 514844, 514845, 514846, 514848, A61K 750
Patent
active
054477239
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present application relates to the use of a triethanolamine product mixture having a low content of diethanolamine and monoethanolamine in cosmetic products, such as shampoos and creams, and cleaning compositions, e.g., for hard surfaces.
2. Description of the Related Art
The use of triethanolamine in a variety of cosmetic products, and cleaning compositions is well known. Triethanolamines are normally produced in one or more steps by ethoxylating ammonia with ethylene oxide. In order to avoid the formation of polyalkyleneglycol chains, HOC.sub.2 H.sub.4 (OC.sub.2 H.sub.4).sub.n, where n>0, and the quaternization of the nitrogen atom, the ethoxylation is normally stopped when the reaction mixture contains 60-90% by weight of triethanolamine and 10-40% by weight of diethanolamine and monethanolamine. Such a reaction mixture may be subjected to distillation to obtain purer triethanolamine. The fact that the triethanolamine reaction product contains a large amount of diethanolamine has not previously been considered a real drawback, as diethanolamine contributes to anticorrosion properties when used in functional fluids and to a desired alkalinity and foam stabilization when used in cosmetic products and cleaning compositions.
Recently, more attention has been paid to the fact the diethanolamine is toxic and forms nitrosamines, which are carcinogenic in animal tests. Therefore, a reduction of the content of diethanolamine is desirable. The content should according to recommentations be less than 1% by weight.
Thus, one object of the invention is to produce a triethanolamine product mixture which contains diethanolamine in an amount less than 1% by weight. This triethanolamine product mixture shall at least have about the same foam stabilizing properties in cosmetics and cleaning products as triethanolamine.
Another object of the invention is that the method of producing a triethanolamine product mixture shall be simple to perform and that the mixture shall be usable without any additional cleaning and/or working-up processes, such as distillation.
Still another object of the invention is to keep the formation of quarternized triethanolamine and polyalkylene glycol chain containing ethanolamine products to a low level.
SUMMARY OF THE INVENTION
According to the invention it has now been found that these objects can be met by using in cosmetic products, and cleaning compositions, a triethanolamine mixture containing a major part of triethanolamine, a minor part of diethanolmono-C.sub.3-4 -alkanolamine and monoethanoldi-C.sub.3-4 -alkanolamine, and less than 1% by weight of diethanolamine and monoethanolamine. By the expression "major part of triethanolamine" is here understood that said triethanolamine constitutes at least 50% by weight of the product mixture. The triethanol amine product mixture used in accordance with the invention can easily be obtained by reacting a conventional triethanolamine reaction mixture, obtained when reacting ammonia in one or more steps, with a C.sub.3 -C.sub.4 -alkylene oxide.
Such a process is described in British Patent No 1 140 867. Diethanolamine and monoethanolamine which are both reactants in the process have a catalytic effect and catalyze rather selectively their own alkoxylation. The presence of an effective amount of alkoxylation catalyst other than the diethanolamine and monoethanolamine shall preferably be avoided in order not to favour undesired side reactions. By the process, the contents of diethanolamine and monoethanolamine are reduced to less than 1% by weight, while the undesired side reactions, such as alkoxylation of hydroxyl groups or quarternization of the nitrogen atom, is kept on a low level. In order to further suppress side reactions, it has been found suitable to perform the reaction below 160.degree. C., preferably between 120.degree.-150.degree. C. The amount of alkylene oxide added has to be adjusted in relation to the amount of diethanolamine and monoethanolamine, so that the latter on
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patent: 4070309 (1978-01-01), Jacobsen
patent: 4235898 (1980-11-01), Watanabe et al.
patent: 4273937 (1981-06-01), Gum et al.
patent: 4725319 (1988-02-01), Osberghaus
patent: 4820308 (1989-04-01), Madrange et al.
Berol Nobel AB
Howard Sharon
Kishore Gollamundi S.
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