| 摘要 |
This invention provides a particulate dry blend thickening agent consisting of polygalactomannan gum (e.g., guar gum), benzoquinone, and a basic reagent (e.g., sodium carbonate). This invention further provides a process for preparing a viscoelastic aqueous solution which contains a benzoquinone ether adduct of polygalactomannan gum that is formed in situ. An invention thixotropic aqueous medium is characterized by excellent heat stability and high tolerance to the presence of inorganic salts. A unique property of an invention thixotropic aqueous medium is a time-dependent gradual restoration of high viscosity after cessation of high shear deformation.
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