Process for a cationic cathodic electrocoat
AssigneeNissan Motor Co., Ltd.
InventorHironobu Kato
Life of this patent
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Abstract
Cationic cathodic electrocoat is conducted by using a cationic electrodepositable paint bath having a pH value of about 6.0-8.0 and by supplementing the bath with a supplemental feed paint prepared by mixing a filtrate obtained by filtering the above described electrodepositable paint bath and a supplemental feed electrodepositable paint having a lower neutralization equivalent than the former electrodepositable paint to dissolve and disperse said paint to obtain a dispersion and then diluting homogeneously the obtained dispersion with the bath derived from the above described paint bath, whereby the property values of the electrodepositable paint bath are controlled.
Claims9
A process for cationic cathodic electrocoating, comprising the steps of:
- cathodically electrocoating a first cationic electrodepositable paint composition having a pH value between about 6.0 and 8.0 and a first neutralization equivalent;
- filtering said cationic electrodepositable paint composition to produce a filtrate;
- mixing said filtrate with a second electrodepositable paint composition having a second neutralization equivalent lower than said first neutralization equivalent to obtain a dispersion;
- homogeneously diluting said dispersion with a portion of said first electrodepositable paint composition to obtain a supplemental feed electrodepositable paint composition;
- and
- periodically supplementing said first electrodepositable paint composition with said supplemental feed paint composition, whereby the properties of said first electrodepositable paint composition are maintained.
Dependencies are inferred from the claim text.