| abstract |
The invention is 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 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. The adhesive of this invention provides reasonable drive away times for replacement glass it binds into automobiles. Such drive away times are preferably about 60 minutes and more preferably about 30 minutes from application of the adhesive. The adhesive of the invention also provides reasonable working times, about 10 to 12 minutes. Additionally the lap shear strengths of the adhesive at the drive away time is preferably about 150 psi (1033 kPa) and more preferably about 250 psi (1723 kPa) according to ASTM D-3163. |