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Polyacrylate and Polymethacrylate ester based hydrogel adhesives

  • US 5,614,586 A
  • Filed: 03/22/1995
  • Issued: 03/25/1997
  • Est. Priority Date: 04/06/1994
  • Status: Expired due to Term
First Claim
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1. A hydrogel adhesive comprising a copolymer formed by copolymerizing and cross-linking a first water soluble monomer having the structure (I) ##STR7## where, R1 is selected from the group consisting of H and CH3 ;

  • R2 is selected from the group consisting of a straight or branched chain alkyl radical of 2-12 carbon atoms, a straight or branched chain aliphatic ester of 5-12 carbon and oxygen atoms, and a straight or branched chain ether radical of 3-12 carbon and oxygen atoms;

    X is an ionic group selected from the group consisting of SO3-, COO- and ##STR8## where R3, R4, and R5 are independently selected from the group consisting of H and alkyl groups of 1-4 carbon atoms;

    with a second water soluble monomer having the structure (II)
    
    
    space="preserve" listing-type="equation">CH.sub.2 ═

    CH--Y (II)where Y is selected from the group consisting of ##STR9## where R6, R7 are independently selected from the group consisting of H and alkyl groups of 1-3 carbon atoms;

    in the presence of water, a multifunctional cross-linking agent, and a humectant;

    wherein said first water soluble monomer is selected from the group consisting of potassium-3-sulfopropyl acrylate, potassium-3-sulfopropyl methacrylate, 2-carboxyethylacrylate, 2-sulfoethylmethacrylate, and methacryloxyethyl trimethylammonium chloride; and

    wherein said second water soluble monomer is selected from the group consisting of acrylic acid, acrylamide, alkylated acrylamides, vinyl pyrrolidone, vinyl sulfonic acid, and vinyl phosphonic acid.

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