Chemistry: electrical and wave energy – Processes and products – Electrostatic field or electrical discharge
Patent
1976-11-24
1978-03-28
Williams, Howard S.
Chemistry: electrical and wave energy
Processes and products
Electrostatic field or electrical discharge
C25D 1310, C25D 1324
Patent
active
040813410
ABSTRACT:
Quaternary ammonium hydroxide-containing polymers and their use in cationic electrodeposition are disclosed. The quaternary ammonium hydroxide-containing polymers are particularly useful as feed resins for controlling the pH of aqueous dispersions of acidified cationic resins used in electrodeposition. Upon electrodeposition, such resins generate acid which can build up to undesirable levels in the electrodeposition bath. The quaternary ammonium hydroxide-containing polymers are strong bases and when fed into the bath react with the acid to form the corresponding quaternary ammonium salt. This controls the pH of the bath at acceptable levels and provides additional cationic resin for electrodeposition. Utilizing the invention in this manner minimizes the need for controlling acid build-up in the electrodeposition bath by conventional techniques such as by treating the bath with ultrafiltration or electrodialysis.
The quaternary ammonium hydroxide-containing polymers are also useful as electrodeposition resins themselves in that they electrodeposit without generating acid counter ion.
REFERENCES:
patent: 2676166 (1954-04-01), Webers
patent: 3922212 (1975-11-01), Gilchrist
patent: 3954588 (1976-05-01), Hazan et al.
patent: 4001101 (1977-01-01), Bosso et al.
Bosso Joseph F.
Chang Wen-Hsuan
Christenson Roger M.
Hartman Marvis E.
PPG Industries Inc.
Uhl William J.
Williams Howard S.
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