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MDI-based polyurethane prepolymer with low monomeric MDI content

  • US 6,884,904 B2
  • Filed: 04/12/2001
  • Issued: 04/26/2005
  • Est. Priority Date: 04/12/2001
  • Status: Expired due to Term
First Claim
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1. In a method for adhesively joining or sealing two substrates using a polyurethane adhesive composition comprising a polyurethane prepolymer composition and, optionally, an isocyanate-reactive curative by applying onto a substrate the polyurethane adhesive composition and contacting the adhesive composition disposed on the substrate to a second substrata such that a bond is formed, the Improvement which comprises utilizing a polyurethane prepolymer composition comprising the prepolymer reaction product of (a) 4,4′

  • -diphenylmethane diisocyanate (MDI) and (b) a polyol composition comprising a propylene oxide based polyether polyol and consisting essentially of at least 80 wt % perfect prepolymers and less than 2 wt % free MDI monomer.

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