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Polyurethane adhesive

  • US 6,630,050 B1
  • Filed: 05/24/2000
  • Issued: 10/07/2003
  • Est. Priority Date: 09/24/1997
  • Status: Expired due to Fees
First Claim
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1. An adhesive composition comprising:

  • a polyurethane comprising a reaction product ofa) at least one diisocyanate; and

    b) at least one low molecular weight polyethylene glycol, wherein, said polyethylene glycol has a molecular weight Mz up to 2,000, and;

    wherein, said polyurethane has a degree of crystallization of less tan 20 percent, as measured by a DSC method, based on a degree of crystallization of polyethylene glycol 6000 as a standard, is permanently tacky and is water-soluble or dispersible in water, wherein, said low molecular weight polyethylene glycol is partly replaced by at least one polyol selected from the group consisting of;

    a) up to 50 percent by weight of a block or statistical copolymer of ethylene oxide;

    b) up to 20 percent by weight of a hydrophobic aliphatic or cycloaliphatic diol;

    c) up to 10 percent by weight of hydrophobic homopolymeric polyalkylene glycols, wherein the alkylene group in said glycols contains more than 2 carbon atoms and said glycols have a molecular weight of from 150 to 10,000;

    d) up to 40 percent by weight of polyethylene glycol with a molecular weight of from 2,000 to 40,000;

    e) up to 5 percent by weight of triols; and

    f) up to 5 percent by weight of ion-forming diols, said percentages shown representing percent by weight, based on the total weight of said polyethylene glycol and polyols and;

    wherein, the diisocyanate can contain up to 50% by weight of TMXDI based on the weight of the diisocyanate.

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