Polyurea elastomer systems with improved adhesion to substrates
AssigneeHuntsman Petrochemical Corporation
InventorDudley J. Primeaux, II
Life of this patent
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Abstract
Polyurea elastomer systems have improved adhesion to a substrate with the use of a primer that is applied first. The primer is composed of hydrophobic, primary hydroxyl-containing compound, for example, castor oil, and an isocyanate. It is not necessary to wait for the primer to cure prior to applying of the polyurea elastomer system. The primer system is particularly useful on wet substrates, where the primer penetrates the substrate prior to polyurea elastomer spraying. Regardless of whether the substrate is dry or wet, adhesion is improved.
Claims20
A polyurea elastomer system comprising:
- a primer comprising:
- a water emulsifiable isocyanate, and
- a hydrophobic, primary hydroxyl-containing compound;
- a polyurea elastomer comprising:
- a quasi-prepolymer of
- an isocyanate, and
- an active hydrogen-containing material;
- at least one amine resin;
- and
- at least one amine-terminated chain extender.
A method for applying a polyurea elastomer coating on a substrate comprising:
- applying a primer to the substrate, where the primer comprises:
- a water emulsifiable isocyanate, and
- a hydrophobic, primary hydroxyl-containing compound;
- applying a polyurea elastomer onto the substrate bearing the primer, where the polyurea elastomer comprises:
- a quasi-prepolymer of
- an isocyanate, and
- an active hydrogen-containing material;
- at least one amine resin;
- and
- at least one amine-terminated chain extender.
A method for applying a polyurea elastomer coating on a wet substrate comprising:
- applying a primer to the substrate wet with water, where the primer comprises:
- a water emulsifiable isocyanate, and
- hydrophobic, primary hydroxyl-containing compound;
- where the volume ratio of water emulsifiable isocyanate to hydrophobic, primary hydroxyl-containing compound in the primer ranges from about 1.5:1 to about 1:1.5;
- applying a polyurea elastomer onto the substrate bearing the primer, where the polyurea elastomer comprises:
- a quasi-prepolymer of
- an isocyanate, and
- an active hydrogen-containing material;
- at least one amine resin;
- and
- at least one amine-terminated chain extender.
Dependencies are inferred from the claim text.