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Flame laminable hydrophilic ester polyurethane foams

  • US 7,687,139 B2
  • Filed: 02/26/2008
  • Issued: 03/30/2010
  • Est. Priority Date: 07/06/2004
  • Status: Active Grant
First Claim
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1. A laminate structure, comprising:

  • a hydrophilic ester polyurethane foam sheet,a sacrificial sheet of a nonhydrophilic ester polyurethane foam with a density of 90 lb/ft3 or less, anda substrate,wherein the hydrophilic ester polyurethane foam sheet is bonded to the substrate by flame bonding,wherein said flame bonding heats and repolymerizes the sacrificial sheet of a nonhydrophilic ester polyurethane foam to join a face surface of said sacrificial sheet to a surface of the hydrophilic ester polyurethane foam sheet and to join a reverse surface of the sacrificial sheet to a surface of the substrate to thereby form the laminate structure of the hydrophilic ester polyurethane foam sheet, the repolymerized sacrificial sheet and the substrate;

    such that the hydrophilic ester polyurethane foam sheet is bonded uniformly to the substrate surface with a bond strength of at least about 7 oz/inch (76.6 N/m) with standard deviation of about 0.6 oz/inch (6.7 N/m).

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