Epoxy surfacer cements containing polyamine-ketimine mixtures

Details Epoxy surfacer cements containing polyamine-ketimine mixtures Epoxy surfacer cements containing polyamine-ketimine mixtures

1978-04-07

1979-04-10

Anderson, Harold D.

Coating processes

Spraying

260 18EP, 528 98, 528118, 528120, 528123, 528407, C08G 5956

Patent

active

041489500

ABSTRACT:
Room temperature curable epoxy compositions and method are disclosed. The compositions comprise resinous epoxide; a mixed amine-ketimine curing agent comprising a cyclic polyamine having at least two epoxide-reactive, aliphatic amino functional groups, a portion of the amino functional groups in the mixed curing agent being in ketimine form the remainder being in the free amine form; and water in at least about the stoichiometric proportion for hydrolyzing the ketimine groups to the free amine form. The compositions may also comprise inorganic filler such as finely divided silica and sand. The ingredients of the composition are mixed to form a sprayable composition. The working life, or pot life, of the composition can be controlled without excessively affecting the working viscosity or sprayability of the composition by varying the ratio of free amine to ketimine groups in the mixed curing agent and varying the proportion of water in the composition to maintain at least the stoichiometric proportion for hydrolyzing the ketimine groups.

REFERENCES:
patent: 3032526 (1962-05-01), Smith et al.
patent: 3291775 (1966-12-01), Holm
patent: 3322797 (1967-05-01), Holm
patent: 3442856 (1969-05-01), Floyd
patent: 3547886 (1970-12-01), Gardner et al.

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