Synthetic resins or natural rubbers -- part of the class 520 ser – Synthetic resins – At least one aryl ring which is part of a fused or bridged...
Patent
1997-07-15
1998-12-22
Niland, Patrick D.
Synthetic resins or natural rubbers -- part of the class 520 ser
Synthetic resins
At least one aryl ring which is part of a fused or bridged...
524445, 428 59, 428 60, 428 65, 428 66, 428 73, C08J 300, C08K 320, C08L 7500, C08G 1810
Patent
active
058521038
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.
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Essex Specialty Products Inc.
Niland Patrick D.
Sims Norman L.
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