Two-part moisture curable polyurethane adhesive
AssigneeThe Dow Chemical Company
InventorShailesh S. Bhat
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Abstract
The invention is the process for binding two substrates together using a two-part adhesive comprising as a first part: A. a polyurethane prepolymer having reactive isocyanate moieties; and a second part B. a curative composition comprising 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.
Claims8
A process for binding two substrates together which comprises:
- 1 contacting a portion of part A with a portion of part B of the 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 dispersed in a polyether polyol-based polyurethane prepolymer having reactive hydroxyl moieties, and optionally, containing 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,
- 2 applying the mixture of part A and part B to a first substrate;
- and
- 3 contacting a second substrate with the mixture of part A and part B previously applied to the first substrate under conditions such that the mixture cures and binds the first substrate to the second substrate.
Dependencies are inferred from the claim text.