Emulsifier composition based on polyglycerol ester

• US 5,674,475 A
• Filed: 04/07/1995
• Issued: 10/07/1997
• Est. Priority Date: 04/08/1994
• Status: Expired due to Term

• Current Assignee: Nikko Chemicals Co., Ltd. (Asahi Printing Company Limited), IFAC GmbH & Co. KG (Kemira Oyj)
• Original Assignee: Nikko Chemicals Co., Ltd. (Asahi Printing Company Limited), IFAC GmbH & Co. KG (Kemira Oyj)
• Inventors: Tagawa, Masato, Dahms, Gerd H.
• Primary Examiner(s): Lovering, Richard D.
• Assistant Examiner(s): Metzmaier, Daniel S.
• Application Number:
  US08/419,596
• Time in Patent Office: 914 Days
• Field of Search: 252/312, 252/351, 252/356, 424/59, 514/938, 514/939
• US Class Current: 424/59
• CPC Class Codes: A61K 8/06 Emulsions
• CPC Class Codes: A61K 8/375 the alcohol moiety containing more than one hydroxy group
• CPC Class Codes: A61K 8/85 Polyesters
• CPC Class Codes: A61Q 17/04 Topical preparations for affording protection against sunlight or other radiation; Topical sun tanning preparations
• CPC Class Codes: C07C 59/08 Lactic acid
• CPC Class Codes: C09K 23/00 Use of substances as emulsifying, wetting, dispersing, or foam-producing agents
• CPC Class Codes: C09K 23/34 Higher-molecular-weight carboxylic acid esters esters of higher fatty acids with hydroxyalkylated sulfonic acids or salts thereof C09K23/06
• CPC Class Codes: C09K 23/38 Alcohols, e.g. oxidation products of paraffins
• CPC Class Codes: Y10S 516/01 Wetting, emulsifying, dispersing, or stabilizing agents
• CPC Class Codes: Y10S 516/06 Protein or carboxylic compound containing

Abstract

Emulsifier composition is a mixture of polyglycerol fatty acid ester (n≧4) and the lactylate of a fatty acid (C≧8) or its salt and is used to manufacture a wide range of different O/W emulsions, e.g. sunscreen emulsions for cosmetics. The polyglycerol fatty acid ester preferably has an HLB value≦8. The emulsifier composition can additionally contain a lipophilic emulsifier.

Claims

1. An emulsifier composition based on polyglycerol fatty acid ester, consisting essentially of:

polyglycerol fatty acid ester having a polymerization degree n of at least 4 and an HLB value of 8 or less,

at least one lactylate or salt thereof derived from a saturated non-branched fatty acid with a carbon number of at least 8, and

a lipophilic emulsifier which is a higher alcohol having a carbon number of 14 to 22 wherein said polyglycerol and said lactylate are present in a proportion of polyglycerol to lactylate by weight in the range between 1;

20 and 20;

1.

2. An emulsifier composition as defined in claim 1 wherein said saturated non-branched fatty acid has a carbon number of 22 or less, and said polyglycerol fatty acid ester has an average polymerization degree n of 10 or less.

3. An emulsifier composition as defined in claim 1 wherein the fatty acid of the lactylate is has a carbon number of 8 to 18.

4. The emulsifier composition of claim 3 wherein the fatty acid of the lactylate is 12-hydroxystearic acid.

5. An emulsifier composition as defined in claim 1, wherein said higher alcohol is selected from the group consisting of mirystyl alcohol, cetyl alcohol, stearyl alcohol and behenyl alcohol.

6. An emulsifier composition as defined in claim 4, wherein the fatty acid of said polyglycerol fatty acid ester has a carbon number of 12 or more.

7. A sunscreen cosmetic comprising the emulsifier as defined in claim 1, and at least one sunscreen agent selected from the group consisting of organic UV absorbing agents and inorganic sunscreen micropigments.

8. A sunscreen cosmetic comprising the emulsifier as defined in claim 1, and at least one sunscreen agent selected from the group consisting of organic UV absorbing agents and inorganic sunscreen micropigments, and further contains a skin care agent.

9. An O/W emulsion comprising the emulsifier compositions as defined in claim 1 in its oil phase.

10. An O/W emulsion as defined in claim 9, wherein said emulsifier composition is present in an amount of 1.0 to 4.0 percent by weight of the entire O/W emulsion.

11. An O/W emulsion as defined in claim 9, wherein said emulsifier composition is present in an amount of 1.5 to 3.5 percent by weight of the entire O/W emulsion.