Process for the production of multilayer coatings

Details Process for the production of multilayer coatings Process for the production of multilayer coatings

1993-10-14

1995-02-14

Lusignan, Michael

Coating processes

Applying superposed diverse coating or coating a coated base

Synthetic resin coating

2041811, 427409, 427410, 4274121, B05D 136, B05D 700

Patent

active

053894065

ABSTRACT:
A process is described for producing multilayer coatings in which a first coating layer of a first aqueous coating medium is applied to an electrically conducting substrate by electrophoretic deposition, is provided wet-in-wet with a second coating layer of a second aqueous coating medium, followed by joint stoving, wherein a coating medium based on one or more vehicles stabilised by ionic groups and which crosslink on stoving with the formation of urethane groups is used for the second coating layer, and the coating media are selected so that the maximum pigment/vehicle weight ratio of the first coating medium is 1:1, that the ratio of the pigment/vehicle weight ratio of the first coating medium to that of the second coating medium is up to 1.8, and the minimum stoving temperature interval of the second coating layer is above that of the first coating layer or overlaps the latter so that the lower limit of the interval for the second coating layer is above the lower limit of the interval for the first coating layer.

REFERENCES:
patent: 4988420 (1991-11-01), Batzill et al.
patent: 5120415 (1992-06-01), Yuan
patent: 5229210 (1993-07-01), Kasukawa et al.

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