Urea-, glycerate- and, hydroxyamide-headed hydrocarbon chain lyotropic phases forming surfactants
The invention provides a compound containing a head group based on urea, glycerol or glycerate and a tail selected from the group consisting of a branched alkyl chain, a branched alkyloxy chain or an alkenyl chain. The compounds may be used as surfactants to form a lyotropic phase that is stable in excess polar solution.
1 . A compound containing a head group selected from the group consisting of any one of structures (I) to (III):
wherein
in structure (I) R 2 is —H, —CH 2 CH 2 OH or another tail group,
R 3 and R 4 are independently selected from one or more of —H, —C(O)NH 2 , —CH 2 CH 2 OH, —CH 2 CH(OH)CH 2 OH,
in structure (II) X is O, S or N,
t and u are independently 0 or 1,
R 5 is —C(CH 2 OH) 2 alkyl, —CH(OH)CH 2 OH (provided the tail group is not oleyl),
—C(OH) 2 CH 2 OH, —CH(CH 2 OH) 2 , —CH 2 (CHOH) 2 CH 2 OH,
—CH 2 C(O)NHC(O)NH 2 ;
and a tail selected from:
wherein n is an integer from 2 to 6, a is an integer from 1 to 12, b is an integer from 0 to 10, d is an integer from 0 to 3, e is an integer from 1 to 12, w is an integer from 2 to 10, y is an integer from 1 to 10 and z is an integer from 2 to 10.
2 . A compound as in claim 1 wherein the tail is selected from the group consisting of (3,7,11-trimethyl)dodecane, (3,7,11,15-tetramethyl)hexadecane, octadec-9-enyl and octadec-9,12-dienyl chains.
3 . A compound as in claim 2 wherein the head group is:
4 . A compound as in claim 2 wherein the head group is:
5 . A compound as in claim 2 wherein the head group is:
6 . A compound as in claim 2 wherein the head group is:
7 . A compound as in claim 2 wherein the head group is:
8 . A compound as in claim 2 wherein the head group is:
9 . A surfactant that forms a lyotropic phase that is stable in excess polar solution, the surfactant containing a head group selected from the group consisting of any one of structures (I) to (V):
and a tail selected from the group consisting of a branched alkyl chain, a branched alkyloxy chain or an alkenyl chain, and wherein
in structure (I) R 2 is —H, —CH 2 CH 2 OH or another tail group,
R 3 and R 4 are independently selected from one or more of —H, —C(O)NH 2 , —CH 2 CH 2 OH, —CH 2 CH(OH)CH 2 OH,
in structure (II) X is O, S or N,
t and u are independently 0 or 1,
R 5 is —C(CH 2 OH) 2 alkyl, —CH(OH)CH 2 OH (provided the tail group is not oleyl), —CH 2 COOH,
—C(OH) 2 CH 2 OH, —CH(CH 2 OH) 2 , —CH 2 (CHOH) 2 CH 2 OH,
—CH 2 C(O)NHC(O)NH 2 ,
in structure (III) R 6 is —H or —OH,
R 7 is —CH 2 OH or —CH 2 NHC(O)NH 2 ,
in structure (IV) R 8 is —H or -alkyl,
R 9 is —H or -alkyl.
10 . A surfactant as in claim 9 wherein the tail is selected from:
wherein n is an integer from 2 to 6, a is an integer from 1 to 12, b is an integer from 0 to 10, d is an integer from 0 to 3, e is an integer from 1 to 12, w is an integer from 2 to 10, y is an integer from 1 to 10 and z is an integer from 2 to 10.
11 . A surfactant as in claim 10 wherein the tail is selected from the group consisting, of (3,7,11-trimethyl)dodecane, (3,7,11,15-tetramethyl)hexadecane, octadec-9-enyl and octadec-9,12-dienyl chains.
12 . A surfactant as in claim 11 wherein the head group is:
13 . A surfactant as in claim 11 wherein the head group is:
14 . A surfactant as in claim 11 wherein the head group is:
15 . A surfactant as in claim 11 wherein the head group is:
16 . A surfactant as in claim 11 wherein the head group is:
17 . A surfactant as in claim 11 wherein the head group is:
18 . A surfactant as in claim 11 wherein me lyotropic phase forms in excess water at a temperature of less than about 150° C.
19 . A surfactant as in claim 18 wherein the lyotropic phase that is formed is a bicontinuous cubic liquid crystalline phase.
20 . A surfactant as in claim 18 wherein the lyotropic phase that is formed is a reversed hexagonal liquid crystalline phase.
21 . A surfactant as in claim 18 wherein the lyotropic phase that is formed does not undergo a transition to a more hydrophilic phase upon addition of excess water.
22 . A surfactant as in claim 18 wherein excess water that is added to the lyotropic phase forms a phase separated domain.
23 . A surfactant as in claim 18 wherein the lyotropic phase contains a solute that is included within the lyotropic phase.
24 . A surfactant as in claim 23 wherein the solute is selected from one or more of the list consisting of diagnostic agents, polymerisation monomers, polymerisation initiators, proteins and other polypeptides, oligonucleotides, denatured and non-denatured DNA, radioactive therapeutic agents, sunscreen active constituents, skin penetration enhancers, skin disease therapeutic agents, transdermally active compounds, transmucosally active compounds, skin repair agents, wound healing compounds, skin cleansing agents, degreasing agents, viscosity modifying polymers, hair care actives, gastric lipase-labile compounds, agricultural chemicals, fertilisers and nutrients, vitamins and minerals, explosives or detonatable materials and components thereof, mining and mineral processing materials, surface coating materials.
25 . A composition containing a lyotropic phase formed from a surfactant of claim 9 .
26 . A colloidal particle consisting of a lyotropic phase of the micellar or liquid crystalline type, formed from a surfactant of claim 9.