Method and plate apparatus for dew point evaporative cooler

  • US 7,197,887 B2
  • Filed: 03/25/2003
  • Issued: 04/03/2007
  • Est. Priority Date: 09/27/2000
  • Status: Active Grant
First Claim
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1. A method of making a polymeric hydrogel comprising an anhydride or acid-polymer, maleic anhydride or maleic acid polymer, or copolymer thereof, with an alkylvinylether or olefin, or copolymer thereof, crosslinked with a crosslinking agent having at least 2 crosslinkable groups, where the crosslinkable group is selected from the group consisting of an alcohol (—

  • OH), amine (—

    NH2) or alcohol-amine (—

    OH) (—

    NH2), and water, which method comprises reacting a maleic anhydride or maleic acid polymer with a crosslinking agent having at least 2 crosslinkable groups in the presence of an esterification or amidation catalyst, in water as solvent.

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