Claims
- 1. A viscoelastic fluid comprising:(1) an aqueous medium; (2) an amphoteric surfactant; and (3) a member selected from the group consisting of organic acids, organic acid salts, inorganic salts, and combination of one or more organic acids or organic acid salts with one or more inorganic salts; wherein the fluid exhibits the property of viscoelasticity, and wherein the amphoteric surfactant is represented by formula (VI): wherein R1 represents alkyl, alkenyl, alkylarylalkylene, alkenylarylalkylene, alkylaminoalkylene, alkenylaminoalkylene, alkylamidoalkylene, or alkenylamidoalkylene, wherein each of the alkyl groups have from about 14 to about 24 carbon atoms and may be branched or straight chained and saturated or unsaturated, and wherein the alkylene groups have from about 1 to about 6 carbon atoms,R2 is selected from the group of alkyl, alkenyl, arylalkyl, hydroxyalkyl, carboxyalkyl, and hydroxyalkyl polyoxyalkylene, each having from about 1 to about 10 carbon atoms, andR4 is a hydrocarbyl radical with chain length of about 1 to about 4.
- 2. A viscoelastic fluid comprising:(1) an aqueous medium; (2) a zwitterionic surfactant; (3) a member selected from the group consisting of organic acids, organic acid salts, inorganic salts, and combinations of one or more organic acids or organic acid salts with one or more inorganic salts; and (4) an anionic surfactant, wherein the ratio of zwitterionic surfactant to anionic surfactant is 3⅓ to 1 or greater; wherein the fluid exhibits the property of viscoelasticity, wherein the zwitterionic surfactant is oleoamidopropyl betaine.
- 3. A viscoelastic fluid comprising(1) an aqueous medium; (2) a zwitterionic surfactant; and (3) a member selected from the group consisting of organic acids, organic acid salts, inorganic salts, and combinations of one or more organic acids or organic acid salts with one or more inorganic salts; and (4) an anionic surfactant, wherein the anionic surfactant is present at 1.2% or less by weight of the fluid; wherein the fluid exhibits the property of viscoelasticity, and wherein the zwitterionic surfactant is oleoamidopropyl betaine.
Parent Case Info
This application is a continuation application of U.S. Ser. No. 09/093,131, filed Jun. 8, 1998 and issued as U.S. Pat. No. 6,258,859 B1, which claims the benefits of the disclosure of U.S. Provisional Patent Application Ser. Nos. 60/049,045, filed on Jun. 10, 1997, and No. 60/054,455, filed on Aug. 5, 1997. The disclosure of U.S. Ser. No. 09/093,131, filed Jun. 8, 1998, is incorporated herein by reference.
US Referenced Citations (21)
Foreign Referenced Citations (2)
Number |
Date |
Country |
1298697 |
Apr 1992 |
CA |
0 681 832 |
Mar 1995 |
EP |
Non-Patent Literature Citations (3)
Entry |
Flow Birefringence and Rheological Measurements on Viscoelastic Detergent Solutions, H. Hoffmann, M. Lobel and U. Reilage, Lehrstuhl fur Physikalisohe Chemie der Universitat Bayreuth Universilatsstrape 30, D-8580 Bayreuth, B.R.D., pp. 237-260, date unknown. |
Phase Structure and Rheological Properties of a Mixed Zwitterionic/Anionic Surfactant System, Dorothy Saul, Gordon J. T. Tiddy, Barbara A. Wheeler, Phillip A. Wheeler, and Edwin Willis, Unilever Research Port Sunlight Laboratory, Port Sunlight, Wirral, Cheshire L62 4XN, Jul. 5th, 1973, pp. 163-170. |
Influence of Ionic Surfactants and the Viscoelastic Properties of Zwitterionic Surfactant Solutions, H. Hoffman, A. Rauscher, M. Gradzielski, and S.F. Schulz, Lehrstuhl fur Physikalische Chemie, Universitat Bayreuth, Universitutstrasse 30, W-8580 Bayreuth, Germany, May 18, 1992, pp. 2140-2146. |
Provisional Applications (2)
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Number |
Date |
Country |
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60/049045 |
Jun 1997 |
US |
|
60/054455 |
Aug 1997 |
US |
Continuations (1)
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Number |
Date |
Country |
Parent |
09/093131 |
Jun 1998 |
US |
Child |
09/900229 |
|
US |