Claims
- 1. In an electrophoretic coating process using a bath prepared from a cationic electrophoretic coating composition having a solids concentration of 10 to 25% by weight and a pH maintained at 6 to 8 in which process the bath is replenished with a cationic electrophoretic coating composition having a low neutrality to adjust the pH to 6 to 8 and maintain the solids concentration at 10 to 25% by weight, the improvement comprising maintaining said pH and said solids concentration without using an ion exchange membrane by using as said replenishing composition a composition selected from the group consisting of a replenishing composition (1) and a replenishing composition (2), composition (1) and a replenishing composition (2), the replenishing composition (1) being prepared by admixing a replenishing coating agent having a lower neutrality than the cationic electrophoretic coating composition, substantially the same solids composition as the cationic electrophoretic coating composition except pigment and a solids concentration of 40 to 80% by weight, with a portion of the cationic electrophoretic coating composition being used for the coating process so that the resulting mixture has a solids concentration of 30 to 45% by weight, the replenishing composition (2) being prepared by admixing the replenishing coating agent described above with a portion of the cationic electrophoretic coating composition being used for the coating process to formulate a replenishing primary premix having a solids content of 25 to less than 30% by weight or more than 45 to 50% by weight and further admixing the premix with a portion of the cationic electrophoretic coating composition being used for the coating process so that the resulting mixture has a solids concentration of 10 to 30% by weight.
Priority Claims (1)
Number |
Date |
Country |
Kind |
53-103159 |
Aug 1978 |
JPX |
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Parent Case Info
This is a continuation of the application Ser. No. 224,281 filed Apr. 10, 1980, now abandoned.
US Referenced Citations (3)
Number |
Name |
Date |
Kind |
3444066 |
Brewer et al. |
May 1969 |
|
3922212 |
Gilchrist |
Nov 1975 |
|
4159233 |
Ting et al. |
Jun 1979 |
|
Continuations (1)
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Number |
Date |
Country |
Parent |
224281 |
Apr 1980 |
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