Adhesive bonding and miscellaneous chemical manufacture – Methods – Surface bonding and/or assembly therefor
Patent
1982-02-04
1983-04-12
Nielsen, Earl A.
Adhesive bonding and miscellaneous chemical manufacture
Methods
Surface bonding and/or assembly therefor
156330, 525113, 525122, 525504, 528 28, 528 98, 528100, 528119, 528123, 528354, 528361, 528367, C08G 5944
Patent
active
043797288
ABSTRACT:
This invention is directed to latent thermal curing agents for epoxy resins comprising cyanourea compounds of the formula: ##STR1## wherein R is the organic moiety of a mono- or poly-isocyanate remaining after reaction of the isocyanate group or groups to form cyanourea groups and n is 1 or more, preferably 1 to 2. The epoxy-curing agent system is stable at room temperature and cures at temperatures above 100.degree. C. to form a crosslinked, solid material suitable as an adhesive, sealant or coating. The polymeric form polymerized from dicyanourea compound can be dissolved in a solvent and admixed with an epoxy resin to form a thermoset adhesive, sealant or coating on heating above 100.degree. C. The polymeric form from the combination of cyanourea and dicyanourea or dicyanourea per se dissolving in epoxy resin also forms a thermosetting adhesive, sealant or coating on heating above 100.degree. C.
REFERENCES:
patent: 3956237 (1976-05-01), Doorakian et al.
patent: 4110309 (1978-08-01), Schulze et al.
patent: 4168364 (1979-09-01), Seltzer et al.
patent: 4178427 (1979-12-01), Waddill et al.
patent: 4187367 (1980-02-01), Waddill
McDowell, Jr. William W.
Nielsen Earl A.
Plunkett Richard P.
W. R. Grace & Co.
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