Stock material or miscellaneous articles – Structurally defined web or sheet – Discontinuous or differential coating – impregnation or bond
Patent
1987-10-08
1988-10-11
Nielsen, Earl
Stock material or miscellaneous articles
Structurally defined web or sheet
Discontinuous or differential coating, impregnation or bond
428273, 428290, 523466, 523468, 525423, 528 94, 528104, 528103, C08G 5962
Patent
active
047770848
ABSTRACT:
Viscous oligomeric epoxy resins can be quickly cured at temperatures of 100.degree. C. by incorporating a hardener that is a blend of (a) the oligomeric reaction product of bisphenol A and bisphenol A monoglycidyl ether and (b) an imidazole. The cured resins are tough and resistant to both moisture and high temperatures. Prepregs, in which glass, graphite or polymeric organic fiber sheets are saturated with these resins, are particularly useful in the repair of damaged aircraft and aerospace structures.
REFERENCES:
patent: 3519576 (1970-07-01), Johnson
patent: 3520905 (1970-07-01), Johnson
patent: 3632836 (1972-01-01), Walker
patent: 3884992 (1975-05-01), Shimizu et al.
patent: 4311661 (1982-01-01), Palmer
patent: 4594291 (1986-06-01), Bertram et al.
patent: 4659779 (1987-04-01), Bagga et al.
Brink Richard E.
Krass Frederick
Minnesota Mining and Manufacturing Company
Nielsen Earl
Sell Donald M.
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