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
1998-06-05
2000-10-17
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...
524406, 524407, 524589, 528 44, 528 56, 528 58, 528 65, 528 66, 528 85, C08J 300, C08K 310, C08L 7500, C08G 1800, C08G 1808
Patent
active
061333719
ABSTRACT:
A sealant for forming a fluid seal between the faying surface of two metallic substrates that are compressively and mechanically joined together. The sealant is a liquid in its pre-cured condition and a dry solid in its cured condition. The transition of the sealant from its pre-cured condition to its cured condition occurs at room temperature. The sealant's curing time is not less than about 10 minutes and not more than about 16 hours. The cured sealant has a Shore A hardness between about 30 and 70. The cured sealant is impermeable and resistant to chemical attack by air, water, common solvents and petroleum fuels. Also, the cured sealant is resistant to compressive cold flow, however, the cured sealant is deformable to conform to an abutting surface or with a layer of similar sealant. The cured sealant is flexible and resistant to temperatures between about -65 degrees F. and about 250 degrees F. The sealant is formed by curing a mixture containing an isocyanate having at least two functionalities, a polyol having at least two functionalities, and between about 1% and 50% barium chromate, strontium chromate or zinc chromate by weight of the sealant.
REFERENCES:
patent: 5340652 (1994-08-01), Sondhe et al.
patent: 5719252 (1998-02-01), Dormish et al.
Polyurethane Raw Materials Product Index Polyurethane Products.
Hi-Shear Corporation
Niland Patrick D.
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