Two-part moisture curable polyurethane adhesive
AssigneeEssex Specialty Products, Inc.
InventorShailesh S. Bhat
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Abstract
The invention is a two-part adhesive containing as a first part: A. a polyurethane prepolymer having reactive isocyanate moieties; and a second part B. a curative composition containing i) a polyurea, comprising the reaction product of a polyamine and a polyisocyanate, dispersed in a polyether polyol-based polyurethane prepolymer having reactive hydroxyl moieties, and optionally a plasticizer; ii) a compound having at least one oxazolidine moiety capable of reacting with an isocyanate under curing conditions; and iii) a catalyst capable of catalyzing the reaction of isocyanate and hydroxyl moieties in the presence of moisture.
Claims6
A two-part adhesive comprising:
- A. as a first part a polyurethane prepolymer having reactive isocyanate moieties;
- B. as a second part a curative composition comprising:
- i. from about 8 to about 50 parts by weight of a polyurea comprising the reaction product of a polyamine and a polyisocyanam dispersed in from about 50 to about 85 parts by weight a polyether polyol-based polyurethane prepolymer having reactive hydroxyl moieties, and containing from about 0 to about 40 parts by weight of a plasticizer wherein the parts by weight are based on the total weight of the dispersion and the total parts by weight of the dispersion is 100;
- ii. a compound having at least one oxazolidine moiety capable of reacting with an isocyanate under curing conditions;
- iii. a catalyst capable of catalyzing the reaction of isocyanate and hydroxyl moieties in the presence of moisture.
A two-part adhesive comprising:
- A. as a first part a polyurethane prepolymer having reactive isocyanate moieties;
- B. as a second part a curative composition comprising:
- i. a polyurea comprising the reaction product of a polyamine and a polyisocyanate wherein the polyurea is dispersed in a polyether polyol-based polyurethane prepolymer having reactive hydroxyl moieties, wherein the prepolymer comprises the reaction product of a polyoxyalkylene triol, a polyoxyalkylene diol and a polyisocyanate, and optionally, containing a plasticizer and the polyurea dispersed in the prepolymer demonstrates a viscosity of about 25,000 to about 45,000 centipoise;
- ii. a compound having at least one oxazolidine moiety capable of reacting with an isocyanate under curing conditions;
- iii. a catalyst capable of catalyzing the reaction of isocyanate and hydroxyl moieties in the presence of moisture.
Dependencies are inferred from the claim text.