| 摘要 |
A method for strengthening a hydrogel of a naturally-occurring gelling agent, or a derivative thereof, including the step of adding at least one glycol to the gelling agent of the general formula:in which,n is from 2 to about 8;x is from 6 to about 30; and,y is from 4 to about 20.Also useful of those of the general structure:in which,R<1>, R<2>, R<3>, R<4 >are capable of being -H in all four positions,or H in 0, 1, 2, 3 positions and -CH3 or -C2H5 in any or all of the non-H occupied positions.Further, 1,2-propylene glycol and its ether derivatives, having only secondary alcohol groups, are particularly useful, having the general structure:in which,either or both R<5 >and R<6 >are H or -CH2-CH(OH)-CH3.
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