Curative for structural urethane adhesive
AssigneeAshland Oil, Inc.
InventorDaniel A. Chung
Life of this patent
Estimating the term…
Abstract
A curative for a two part structural primerless urethane adhesive for fiberglass reinforced polyester substrates curable at 240.degree. F. (116.degree. C.).
Claims26
A curative component for a two component primerless structural urethane adhesive curable at 240.degree. F. (116.degree. C.) and demonstrating good sag resistance, said curative comprising a mixture of:
- a polyol and a combination of
- (A) slow reacting diamine selected from the group of primary and secondary aromatic diamines and polyamines and primary and secondary sterically hindered diamines and polyamines and mixtures thereof and
- (B) a fast reacting diamine selected from the group of primary and secondary aliphatic and primary and secondary cycloaliphatic diamines and polyamines and mixtures thereof.
A method of laminating a first fiberglass reinforced sheet molding compound substrate and a second substrate comprising the steps of:
- (A) applying to said first substrate an adhesive prepared by mixing
- (1) an isocyanate terminated prepolymer and
- (2) a curative comprising a polyol and the combination of a slow reacting diamine or polyamine selected from primary and secondary aromatic diamines and polyamines and sterically hindered diamines and polyamines and mixtures thereof and a fast reacting diamine selected from the group of primary and secondary aliphatic diamines and polyamines and primary and secondary cycloaliphatic diamines and polyamines and mixtures thereof,
- (B) affixing said second substrate, and
- (C.) curing said laminate.
A laminated composite comprising a first unprimed fiber reinforced polyester substrate having a second substrate adhesively bound thereto by the cured residue of an adhesive comprising a blend of a prepolymer component comprising the reaction product of a polyol and an aromatic isocyanate and having 3 to 15 percent free isocyanate groups, and a curative component comprising a polyfunctional polyether polyol and the combination of (A) a slow reacting diamine or polyamine selected from the group of primary and secondary aromatic diamines and polyamines and primary and secondary sterically hindered diamines and polyamines and mixtures thereof, and (B) a fast reacting diamine or polyamine selected from the group of primary and secondary aliphatic diamines and polyamines, primary and secondary cycloaliphatic diamines and polyamines and mixtures thereof.
Dependencies are inferred from the claim text.