| 摘要 |
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: i) a polyurea, comprising the reaction product of a polyamine and a polyisocyanate, dispersed in a polyetheer 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 60 minutes and more preferably 30 minutes from application of the adhseive. The adhesive of the invention also provides reasonable working times, 10 to 12 minutes. Additionally, the lap shear strengths of the adhesive at the drive-away time is preferably 150 psi (1033 kPa) and more preferably 250 psi (1723 kPa) according to ASTM D-3163. |
