Concentrated, low-viscosity rhamnolipid compositions

Patent metadata

Field	Value
Publication number	US-10604722-B2
Application number	US-201515520157-A
Country	US
Kind code	B2
Filing date	Nov 9, 2015
Priority date	Nov 19, 2014
Publication date	Mar 31, 2020
Grant date	Mar 31, 2020

Abstract

A rhamnolipid composition including 30% by weight to 70% by weight, of at least one rhamnolipid and 30% by weight to 70% by weight of water, where the percentages by weight refer to the total composition, wherein the pH of the composition at 25° C. is from 5.5 to 7.0. In addition to the foregoing rhamnolipid composition, also set forth is a method to make a solution of rhamnolipids; and salt of at least one rhamnolipid.

First claim

The invention claimed is:

1. A composition comprising
from 30% by weight to 70% by weight, of a rhamnolipid and
from 30% by weight to 70% by weight, of water,
where the percentages by weight refer to the total composition, wherein the pH of the composition at 25° C. is from 5.5 to 6.2

wherein the rhamnolipid is a compound of the general formula (I) and salts thereof,

where
m=2, 1 or 0,
n=1 or 0,
R 1 and R 2 =organic residues having from 2 to 24 carbon atoms
wherein the total dry mass comprises from 40% by weight to 98% by weight of the rhamnolipid,
where the percentages by weight refer to the total dry mass wherein said composition comprises
from 3% by weight to 12% by weight of diRL-C10C12:1,
from 5 to 15% by weight of diRL-C10C12,
from 0.5% by weight to 3% by weight of monoRL-C10C12 and
from 0.5% by weight to 3% by weight of monoRL-C10C12:1,

where the percentages by weight refer to the sum total of all rhamnolipids present.

2. The composition according to claim 1 , wherein the cations of the rhamnolipid salts present are selected from the group consisting of, Li + , Na + , K + , Mg 2+ , Ca 2+ , Al 3+ , NH 4 + , primary ammonium ions, secondary ammonium ions, tertiary ammonium ions or quaternary ammonium ions.

3. The composition according to claim 1 , wherein said composition comprises
from 50% by weight to 99% by weight of rhamnolipid anions,
where % by weight refers to all anions except OH − present in the composition.

4. The composition according to claim 1 , wherein said composition comprises
from 51% by weight to 95% by weight of diRL-C10C10,
where the percentages by weight refer to the sum total of all rhamnolipids present.

5. The composition according to claim 1 , wherein said composition comprises
from 0.5% by weight to 9% by weight of monoRL-C10C10,
where the percentages by weight refer to the sum total of all rhamnolipids present.

6. The composition according to claim 1 , wherein the weight ratio of all di-rhamnolipids present to all mono-rhamnolipids present is greater than 97:3.

7. The composition according to claim 1 , wherein said composition comprises
from 0.5 to 25% by weight of diRL-C10C12,
where the percentages by weight refer to the sum total of all rhamnolipids present.

8. The composition according to claim 1 , wherein said composition comprises
from 0.1% by weight to 5% by weight of monoRL-C10C12 and/or
from 0.1% by weight to 5% by weight of monoRL-C10C12:1,
where the percentages by weight refer to the sum total of all rhamnolipids present.

9. The composition according to claim 1 , wherein said composition comprises
from 0% by weight to 5% by weight of diRLC10,
where the percentages by weight refer to the sum total of all rhamnolipids present.

10. A salt of at least one rhamnolipid according to claim 3 , wherein said salt comprises at least one cation selected from the group consisting of, Li + , K + , Mg 2+ , Ca 2+ , Al 3+ , NH 4 + , primary ammonium ions, secondary ammonium ions, tertiary ammonium ions and quaternary ammonium ions.

11. The composition according to claim 1 , comprising from 35% by weight to 60% by weight, of at least one rhamnolipid and from 40% by weight to 65% by weight, of water,
where the percentages by weight refer to the total composition, wherein the pH of the composition at 25° C. is from 5.6 to 6.0.

12. The composition according to claim 1 , wherein the total dry mass comprises from 60% by weight to 90% by weight, of rhamnolipids, where the percentages by weight refer to the total dry mass.

13. The composition according to claim 4 , wherein the cations of the rhamnolipid salts present are selected from the group consisting of, Li + , Na + , K + , Mg 2+ , Ca 2+ , Al 3+ , NH 4 + , primary ammonium ions, secondary ammonium ions, tertiary ammonium ions and quaternary ammonium ions.

14. The composition according to claim 1 , wherein said composition comprises
from 70% by weight to 95% by weight of rhamnolipid anions, where % by weight refers to all anions except OH − present in the composition.

15. The composition according to claim 1 , wherein said composition comprises
from 51% by weight to 95% by weight of diRL-C10C10,
where the percentages by weight refer to the sum total of all rhamnolipids present.

16. A composition comprising
from 30% by weight to 70% by weight, of a rhamnolipid and
from 30% by weight to 70% by weight, of water,
where the percentages by weight refer to the total composition, wherein the pH of the composition at 25° C. is from 5.5 to 6.2

wherein the rhamnolipid is a compound of the general formula (I) and salts thereof,

where
m=2, 1 or 0,
n=1 or 0,
R 1 and R 2 =organic residues having from 2 to 24 carbon atoms
wherein the total dry mass comprises from 40% by weight to 98% by weight of the rhamnolipid,
where the percentages by weight refer to the total dry mass wherein said composition comprises
from 5% by weight to 10% by weight of diRL-C10C12:1,
from 7% to 12% by weight of diRL-C10C12,
from 0.5% by weight to 2% by weight of monoRL-C10C12 and
from 0.5% by weight to 2% by weight of monoRL-C10C12:1,
where the percentages by weight refer to the sum total of all rhamnolipids present.

17. A method for preparing a solution of rhamnolipids comprising the steps of
a) providing a composition comprising

from 30% by weight to 70% by weight of a rhamnolipid, where the percentages by weight refer to the total composition, and having a pH at 25° C. of from 1.0 to 5.0, wherein the rhamnolipid is a compound of the general formula (I) and salts thereof,

where
m=2, 1 or 0,
n=1 or 0,
R 1 and R 2 =organic residues having 2 to 24 carbon atoms
b) adjusting the pH of the composition to 5.5 to 6.2 and
c) adjusting the water content of the total composition to
from 30% by weight to 70% by weight of water

and adjusting the rhamnolipid content of the total composition to from 30% by weight to 70% by weight of rhamnolipids wherein said composition comprises
from 5% by weight to 10% by weight of diRL-C10C12:1,
from 7% to 12% by weight of diRL-C10C12,
from 0.5% by weight to 2% by weight of monoRL-C10C12 and
from 0.5% by weight to 2% by weight of monoRL-C10C12:1,
where the percentages by weight refer to the sum total of all rhamnolipids present.

18. The method according to claim 17 , wherein the rhamnolipid in the composition provided in method step a) is present at least partially dispersed.

19. The method according to claim 17 , wherein the pH is adjusted in method step b) by adding an organic or inorganic base, in concentrated form.

Assignees

• Evonik Degussa Gmbh
• Evonik Operations Gmbh

Inventors

• Schilling Martin
• Kleinen Jochen
• Lorenz Josef
• Henning Wenk Hans

Classifications

• A61K8/60

  Sugars; Derivatives thereof · CPC title

• C11D1/06 Primary

  Ether- or thioether carboxylic acids · CPC title

• A61Q5/02

  Preparations for cleaning the hair · CPC title

• A61Q19/10

  Washing or bathing preparations · CPC title

• C07H1/06

  Separation; Purification · CPC title