Hydrophobic polyurethane foam
AssigneeWm. T. Burnett & Co., Inc.
InventorDavid J. Kelly
Life of this patent
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Abstract
The invention is a hydrophobic polyurethane foam prepared from a conventional PO/EO polyether polyol, a graft polyol and a hydrophobicity inducing surfactant. The foam is sufficiently hydrophobic to pass a stringent water impermeability test.
Claims65
A polyether polyol based urethane foam composition comprising:
- (a) a polyurethane having polyol segments consisting essentially of polyol segments derived from a graft polyol and polyol segments derived from a PO/EO polyether polyol;
- and
- (b) a hydrophobicity inducing surfactant,
- the foam composition being sufficiently hydrophobic to hold a head of water of about 25 mm for at least about 90 minutes when at least about 50% compressed, with no leaks through the foam.
A polyether polyol based hydrophobic polyurethane foam prepared from a polyol consisting essentially of a conventional polyether polyol and a graft polyol, said foam being sufficiently hydrophobic to hold a head of water of about 25 mm for at least about 60 minutes when at least about 50% compressed, with no leaks through the foam.
A manufactured article comprising a polyether polyol based hydrophobic polyurethane foam prepared from a polyol consisting essentially of a conventional polyether polyol and a graft polyol, said foam being sufficiently hydrophobic to hold a head of water of about 25 mm for at least about 90 minutes when at least about 50% compressed, with no leaks through the foam.
A hydrophobic urethane foam produced by the process of
- combining a polyisocyanate with a polyol consisting essentially of a conventional polyether polyol and a graft polyol and
- allowing said polyisocyanate, said conventional polyether polyol and said graft polyol to react in the presence of a surfactant,
- said foam being sufficiently hydrophobic to hold a head of water of about 25 mm for at least about 60 minutes when at least about 50% compressed, with no leaks through the foam.
A polyether polyol based hydrophobic polyurethane foam composition prepared from:
- a polyol consisting essentially of a graft polyol and a conventional polyether polyol, and having at least about 20 parts of a graft polyol and not more than about 80 parts of a conventional polyether polyol;
- a polyisocyanate;
- and
- a hydrophobicity inducing surfactant;
- wherein said foam is sufficiently hydrophobic to hold a head of water of about 25 mm for at least about 90 minutes when at least about 50% compressed, with no leaks through the foam.
A polyether polyol based foam prepared from a polylsocyanate, a polysiloxane-polyalkylene oxide copolymer surfactant, and a polyol consisting essentially of a PO/EO polyether polyol, a graft polyol, the foam being sufficiently hydrophobic to hold a head of water of about 25 mm for at least about 60 minutes when at least about 50% compressed, with no leaks through the foam.
A process for preparing a hydrophobic polyether polyol based urethane foam comprising:
- combining a polyol consisting essentially of a conventional polyether polyol and a graft polyol, a hydrophobicity inducing surfactant and a polyisocyanate;
- and
- allowing said polyisocyanate and said polyol to react, the resultant foam being sufficiently hydrophobic to hold a head of water of about 25 mm for at least about 90 minutes when at least about 50% compressed, with no leaks through the foam.
A method for selecting the components of a polyether polyol hydrophobic foam comprising:
- (a) combining a known amount of at least one surfactant and an amount of a polyol consisting essentially of an amount of at least one graft polyol, and an amount of at least one conventional polyether polyol,
- (b) preparing a first polyurethane foam from said at least one graft polyol, said at least one conventional polyol and said at least one surfactant,
- (c) testing the first foam for hydrophobicity when at least about 50% compressed,
- (d) selecting the first foam if it is sufficiently hydrophobic to hold a head of water of about 25 mm for at least about 90 minutes with no leaks through the foam, and
- (e) not selecting the first foam if it is not sufficiently hydrophobic to hold a head of water of about 25 mm for at least about 90 minutes with no leaks through the foam.
A hydrophobic polyether polyol based polyurethane foam prepared from:
- (a) a polyol consisting essentially of a graft polyol, and a copolymer of ethylene oxide and propylene oxide, and
- (b) a hydrophobicity inducing surfactant;
- wherein the foam is sufficiently hydrophobic to pass an automotive water impermeability test selected from the Ford Laboratory test method entitled “Test to Verify Water Impermeability of Urethane Foam Seals” and the General Motors water impermeability test for flexible expanded rubber foam materials.
Dependencies are inferred from the claim text.