US 8,802,065 B2Granted

Aqueous preservative solution with high amino acid content

AssigneeAjinomoto Co., Inc.

InventorsEiko Oshimura, Kazuhiko Tobita

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Abstract

Aqueous preservative solutions with a high amino acid content which is excellent in preservation, particularly a preservative effect on fungi, and safety, and is excellent in storage stability so as not to cause a problem such as depositing, coloring or smelling even when it is stored for a long time, and when incorporated in a cosmetic, is capable of imparting a high moisturizing effect without causing a sticky feeling, and imparting an effect of preventing dyed hair from color fading, can be achieved by incorporating pyrrolidone carboxylic acid and/or a salt thereof (Component A), a basic amino acid and/or a salt thereof (Component B), an acidic amino acid and/or a salt thereof (Component C), a neutral amino acid and/or a salt thereof (Component D) and lactic acid and/or a salt thereof (Component E) at a specific incorporation ratio and at a specific pH.

Claims28

Dependent claims

An aqueous preservative solution with a high amino acid content, comprising:

(A) at least pyrrolidone carboxylic acid and/or a salt thereof;
(B) at least one basic amino acid and/or a salt thereof;
(C) at least one acidic amino acid and/or a salt thereof
(D) at least one neutral amino acid and/or a salt thereof;
(E) lactic acid and/or a salt thereof;
and
(F) water,
wherein:
component (A) and component (E) are present in a total amount of from 25 to 40% by weight, based on the total weight of component (A), component (B), component (C), component (D), component (E), and component (F),
component (A) is present in an amount of from 50 to 95% by weight, based on the total weight of component (A) and component (E),
component (A), component (B), component (C), and component (D) are present in a total amount of from 23 to 60% by weight, based on the total weight of component (A), component (B), component (C), component (D), component (E), and component (F), and
the pH of the solution is from 3.5 to 5.5.

9 more elements

Dependencies are inferred from the claim text.

Facts

Application: 12/101,467Filed 11 Apr 2008
Priority: JP 2007-10616113 Apr 2007
Published: US 2008/0260672 A123 Oct 2008
Granted: 12 Aug 2014
Term ends: Not estimatedThe source records don’t support an estimate.

Classification10 codes

A61K 8/365
Carboxylic acids; Salts or anhydrides thereof: hydroxycarboxylic acids; Ketocarboxylic acids
A61K 8/44
Containing nitrogen: aminocarboxylic acids or derivatives thereof, e.g. aminocarboxylic acids containing sulfur; Salts; Esters or N-acylated…
A61K 8/4913
With one nitrogen as the only hetero atom: having five membered rings, e.g. pyrrolidone carboxylic acid
A61K 8/4946
With more than one nitrogen as the only hetero atom: imidazoles or their condensed derivatives, e.g. benzimidazoles