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US 5,288,797 AGranted
Moisture curable polyurethane composition
AssigneeTremco Incorporated
InventorsHamdy Khalil, Witek Majewski, George Nickel, George Wypych, Jeffrey D. van Heumen
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Abstract
A one-part moisture curable polyurethane adhesive composition comprises a blend of polyurethane prepolymers and one or more additives which unexpectedly improve the sag resistance and mechanical properties of the formulation. The final adhesive composition retains good stability in the absence of moisture for an extended period between manufacture and application of the adhesive, and has a relatively rapid and consistent cure rate in the presence of atmospheric moisture. The final cured composition exhibits good mechanical properties and generally is unaffected by ambient application and cure conditions.
Claims30
A polyurethane adhesive composition, comprising:
- a blend of at least polyurethane Prepolymers A, B, and C, an effective amount of carbon black to improve mechanical properties and sag resistance, and an effective amount of a resin having a polyamide backbone to improve sag resistance, said adhesive composition being a one-part moisture curable system;
- each said prepolymer being a reaction product of a polyol and an isocyanate, wherein the polyol used in the formation of at least one of said prepolymers is generally incompatible with the polyols used in the formaiton of said other prepolymers, wherein said polyol of each of said prepolymers is a linear or branched polyol having a backbone of polyacrylate, polybutadiene, polycarbonate, polycaprolactone, polyether, polyester, polythioether, or polyurethane, said polyols each having at least two terminal primary and/or secondary hydroxyl groups;
- wherein said isocyanate of said polyurethane Prepolymer A is an aromatic (poly)isocyanate, wherein said isocyanate of said polyurethane Prepolymer C is an aliphatic or cycloaliphatic (poly)isocyanate and wherein said isocyanate of said polyurethane Prepolymer B is an aromatic (poly)isocyanate or an aliphatic or a cycloaliphatic (poly)isocyanate.
A polyurethane adhesive composition, comprising:
- a blend including at least two polyurethane prepolymers selected from Prepolymers A, C, or B, other than the blend of Prepolymers A and C, and an effective amount of carbon black to improve mechanical properties and sag resistance;
- wherein said adhesive composition is a one-part moisture curable system;
- each said prepolymer being a reaction product of a polyol and an isocyanate, wherein the polyol used in the formation of at least one of said prepolymers is generally incompatible with the polyols used in the formation of said other prepolymers, wherein said polyol of each of said prepolymers is a linear or branched polyol having a backbone of polyacrylate, polybutadiene, polycarbonate, polycaprolactone, polyether, polyester, polythioether, or polyurethane, said polyols each having at least two terminal primary and/or secondary hydroxyl groups;
- wherein said isocyanate of said polyurethane Prepolymer A is an aromatic (poly)isocyanate, wherein said isocyanate of said polyurethane Prepolymer C is an aliphatic of cycloaliphatic (poly)isocyanate, and wherein said isocyanate of said polyurethane Prepolymer B is an aromatic (poly)isocyanate or an aliphatic or a cycloaliphatic (poly)isocyanate.
1 more element
A polyurethane adhesive, comprising:
- a blend including at least two polyurethane prepolymers selected from Prepolymers A, B, or C, other than the blend of Prepolymers A and B, and an effective amount of carbon black to improve mechanical properties and sag resistance;
- wherein said adhesive composition is a one-part moisture curable system;
- each said prepolymer being a reaction product of a polyol and an isocyanate, wherein the polyol used in the formation of said Prepolymer B is generally incompatible with the polyols used in the formation of said other prepolymers, wherein said polyol of each of said prepolymers is a linear or branched polyol having a backbone of polyacrylate, polybutadiene, polycarbonate, polycaprolactone, polyether, polyester, polythioether, or polyurethane, said polyols each having at least two terminal primary and/or secondary hydroxyl groups;
- wherein said isocyanate of said polyurethane Prepolymer A is an aromatic (poly)isocyanate, wherein said isocyanate of said polyurethane Prepolymer C is an aliphatic or cycloaliphatic (poly)isocyanate, and wherein said isocyanate of said polyurethane Prepolymer B is an aromatic (poly)isocyanate or an aliphatic or a cycloaliphatic (poly)isocyanate.
1 more element
Dependencies are inferred from the claim text.