Hydrophilic polymer based on acrylic acid and alkali metal acrylate, its method of preparation and its application as an absorbent, in particular of a physiological solution
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United States of America Patent
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Sep 25, 1990
Grant Date -
N/A
app pub date -
Apr 1, 1988
filing date -
Apr 14, 1987
priority date (Note) -
Expired
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Abstract
This polymer is based on acrylic acid and alkali metal acrylate; it has a degree of absorbency in respect of a physiological solution of 50 to 70 g/g, containing only 20 to 45% of acrylic acid, in molar proportions, and 80 to 55% of potassium acrylate. Its method of preparation is an oil-water suspension polymerization process which is carried out by introducing slowly, while being agitated, into the oil phase containing a protective colloid, a solution obtained starting from an aqueous solution of one or more polymerization initiators and an aqueous solution of the selected monomers, then eliminating any solvent until achieving a degree of dryness of 80.+-.10% by weight, thus isolating the desired copolymer. This polymer is suitable for use as an absorbent.
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