Drug – bio-affecting and body treating compositions – Preparations characterized by special physical form – Cosmetic – antiperspirant – dentifrice
Reexamination Certificate
1998-12-23
2003-03-04
Page, Thurman K. (Department: 1615)
Drug, bio-affecting and body treating compositions
Preparations characterized by special physical form
Cosmetic, antiperspirant, dentifrice
C424S059000, C424S063000, C514S558000, C514S506000, C514S509000
Reexamination Certificate
active
06528068
ABSTRACT:
TECHNICAL FIELD
Disclosed here in the present specification are a group of inventions so linked as to form a single general inventive concept, with respect to various uses of specific N-long-chain acyl neutral amino acid esters and specific N-long-chain acyl acidic amino acid diesters as active ingredients of cosmetic compositions.
A first invention of such a group of inventions (hereinafter, referred to as “the first invention”) relates to an oily ingredient of cosmetics which is formed of a specific N-long-chain acyl neutral amino acid ester, and a cosmetic composition characterized by containing the same. More specifically, it relates to an oily material(or oily ingredient) of cosmetics which is formed of an N-long-chain acyl neutral amino acid ester where the hydrocarbon group of the alcoholic moiety is a straight-chain or branched-chain, saturated or unsaturated hydrocarbon group having from 1 to 10 carbon atoms. (In other words, the hydrocarbon residue of the alcoholic moiety constituting such N-long-chain acyl neutral amino acid ester is a straight-chain or branched-chain, saturated or unsaturated hydrocarbon group with 1 to 10 carbon atoms.) It also relates to a cosmetic composition characterized by containing the same.
A second invention of such a group of inventions (hereinafter, referred to as “the second invention”) relates to an ultraviolet ray-absorbing composition. More specifically, it relates to an ultraviolet ray-absorbing composition characterized by containing an ultraviolet rays absorbent (i.e., an ultraviolet rays absorbing agent) and an N-long-chain acyl neutral amino acid ester or/and an N-long-chain acyl acidic amino acid diester as active ingredient(s). This ultraviolet ray-absorbing composition includes, as an embodiment thereof, a cosmetic composition.
And, a third invention of such a group of inventions (hereinafter, referred to as “the third invention”) relates to an inorganic pigment composition. More specifically, it relates to an inorganic pigment composition characterized by containing an inorganic pigment and an N-long-chain acyl neutral amino acid ester or/and an N-long-chain acyl acidic amino acid diester as active ingredient(s). This inorganic pigment composition includes, as an embodiment thereof, a cosmetic composition.
BACKGROUND ART
First, the background art on the first invention is as follows.
In cosmetic compositions, an oily material is widely used as a binder for the components, an emollient or the like, or for providing a hair conditioning property. As an oily material for a cosmetic composition, mineral oils such as liquid paraffin and the like, and fatty acid esters such as IPM (isopropyl myristate) and IPP (isopropyl palmitate) have been widely used so far.
Further, an example in which amino acid derivatives are used as an oily material has been known. For example, Japnese patent publication (kokoku) No. 12908/1979 discloses an ester of an N-long-chain acyl neutral amino acid and a higher alcohol having from 12 to 30 carbon atoms as an oil-soluble surfactant which is suitable in the field of fragrances.
However, these oily materials for cosmetics have involved problems that the oily materials when formulated in cosmetic compositions may impair the feeling upon use of the cosmetic composition owing to an unpleasant oily feeling or stickiness peculiar to such oily material. Further, a hair conditioning effect has not been satisfactory. Accordingly, an oily material for cosmetics which is better in these points has been in great demand.
By the way, as an N-long-chain acyl neutral amino acid ester, an amino acid ester with a long-chain alcohol has been known as described in the Jap. pat. Publn. (kokoku) No. 12908/1979. However, with respect to an amino acid ester with a shorter-chain alcohol, examples in which it is actually synthesized and studied for use in cosmetics have been hardly known. As a specific example, it is only disclosed on page 167, lower column to page 168, left upper column of the Jap. pat. Publn. (kokoku) No. 129078/1979 that N-2-ethylhexanoyl-N-methyl-&bgr;-alanine.methyl ester is tested and its compatibility with an oily solvent is poor. Thus, an ester of an N-long-chain acyl neutral amino acid and a short-chain alcohol has not been used at all as an oily material for cosmetics.
However, in recent years, owing to the advancement of a blending technique, an emulsifying equipment and the like, the problem of such compatibility is rather considered less serious, and an important subject is how to satisfy consumers' various needs and higher levels of needs.
Accordingly, it is an object of the invention to provide an oily material for cosmetics which is improved in an oily feeling or stickiness, which has an excellent feeling upon use of a cosmetic composition and also in a hair conditioning effect, and further to provide a cosmetic composition containing the same.
Next, the background concerning the second invention is as follows.
Ultraviolet rays are known to give various changes to the skin. In the field of dermatology, ultraviolet rays are classified into long-wave ultraviolet ray (400 to 320 nm), medium-wave ultraviolet ray (320 to 290 nm) and short-wave ultraviolet ray, which are called UV-A, UV-B and UV-C in this order, respectively. Of these, UV-C is absorbed in the ozone layer, and scarcely reaches the earth. Further, with respect to UV-B, it is known that when the skin is irradiated with more than its certain amount, an erythema or a blister is formed or pigmentation occurs. Meanwhile, it has been so far said that UV-A does not change the skin so much. However, it has recently been found through an electron microscope or from a histological evaluation that UV-A changes the elastic fibers in the blood vessel wall or the connective tissue, or damages the sensitive skin. Moreover, it has been reported that UV-A accelerates the activity of UV-B (J. Invest. Derm. 59 (6), 416 (1973)). Accordingly, it is important to cut UV-A. For these reasons, cosmetics or skin medicines for external application often contain an ultraviolet rays absorbent (UV absorbent) as an ultraviolet ray cutting agent (UV cutting agent).
As UV-A absorbents which have been lately highlighted, for example, 4-t-butyl-4′-methoxybenzoylmethane and 2-ethylhexyl dimethoxybenzylidenedioxoimidazolidinepropionate (with respect to the latter, see Japanese patent application laid-open (kokai) No. 101371/1988) can be mentioned. These are solids which are sparingly soluble in water and oil(with respect to the former, see Jap. pat. appln. Laid-open (kokai) No. 291019/1997). The sparingly-soluble UV absorbents involve problems that sufficient amounts thereof cannot be incorporated in cosmetics or the like, and when these UV absorbents are once incorporated, crystals thereof are precipitated in cosmetics or skin medicines for external application during the storage, i.e., the stability thereof is therefore poor. Especially in the latter case, appropriate solvents are limited in their type.
The ultraviolet rays are harmful to (the skin of) humans. Moreover, of plastics, emulsion paints, oil paints, coating agents and the like, there are some components thereof which undergo degradation by ultraviolet rays, and deterioration is prevented by incorporating an ultraviolet ray absorbent in such products. The foregoing problems associated with the sparingly-soluble UV absorbent also occur with respect to the use in such plastics and the like other than the skin of humans.
By the way, an oil is incorporated into cosmetics containing a UV absorbent in order to prevent the UV absorbent from flowing down due to sweat or water. However, there is a problem that when an oil is incorporated into cosmetics or skin medicines for external application, stickiness is provided.
Accordingly, under these circumstances of the conventional art, it is an object of the present invention is to provide an ultraviolet rays absorbing composition usable as a cosmetic composition, which is excellent in the lack of a stickiness, which is less irritates the skin, and in which a
Ishii Hiroji
Koyama Masako
Yumioka Ryosuke
Ajinomoto Co. Inc.
Channavajjala Lakshmi
Page Thurman K.
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