Composite roof structures prepared using one-part moisture curing polyurethane foaming adhesive compositions containing a reversibly blocked catalyst
AssigneeAshland Inc.
InventorsRoger L. Streets, David J. Hatgas, Terri S. Townsend, Carrie D. Margot
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Abstract
The present invention relates to composite roof structures and their preparation. The composite roof structure is prepared by applying a one-part, moisture curable, foaming, polyurethane adhesive composition to the roof deck, placing the roofing material in contact with the adhesive composition, and allowing the adhesive mixture to foam, fill, and cure. If multiple layer of the roofing material are used to form the composite roof structure, then the above procedure may be used to adhere each of the roofing material layers.
Claims6
A method of adhering roofing material to a roof deck, comprising;
- A. applying a one-part, moisture curable, foaming, polyurethane adhesive composition, consisting essentially of;
- i. an isocyanate terminated prepolymer prepared from at least one organic polyisocyanate and at least one composition containing at least two isocyanate reactive moieties, and
- ii. a reversibly blocked catalyst, consisting essentially of;
- the addition product of a sulfonyl isocyanate and a tertiary amine and/or a tin (II) or tin (IV) carboxylate composition;
- to a roof deck;
- B. positioning the roofing material on the deck with sufficient pressure to seat the roofing material in the polyurethane adhesive composition;
- and
- C. allowing the polyurethane composition to foam, fill and cure.
Dependencies are inferred from the claim text.