| 摘要 |
A hydrocolloid polymer exhibiting improved sorption of deionized water and aqueous one weight percent sodium chloride solutions is described as are sorption products using the same. The hyrocolloid polymer consists essentially of (a) about 60 to about 90 mole percent polymerized alpha, beta-monoethylenically unsaturated monocarboxy monomer containing a three carbon atom chain, (b) about 10 to about 40 mole percent polymerized 2-acrylamido-2-methylpropanesulfonic acid, (c) zero to about 20 mole percent polymerized co-polymerizable water-soluble monoethylenically unsaturated monomer, and (d) zero to about 3 mole percent of a copolymerizable water-soluble polyethylenically unsaturated cross-linking agent. One gram of the hydrocolloid polymer, when dry and in free acid form, sorbs about 15 to about 100 percent more of a one weight percent sodium chloride aqueous solution than does a similarly prepared polymer containing identical amounts of all of the ethylenically unsaturated components except for the above sulfonic acid monomer, and includes acrylic acid in place of that sulfonic acid monomer. |
