Title: Prolonging the stability of coating baths

Abstract: Polymeric resinous coatings are formed on metallic surfaces by immersing them in an acidic aqueous coating composition comprising an oxidizing agent and a coating-forming polymeric resin dispersed in said composition by a dispersing agent said resin and dispersing agent being present in a predetermined proportion. The coating composition tends to become unstable as it is used. The stability of the coating composition is maintained by controlling the amounts of metal ions which tend to build-up in the bath and/or the dispersing agent. Specifically, dispersing agent and resin are added to said coating composition in amounts to replenish these ingredients and in a proportion such that the proportion of said added dispersing agent to said added resin is greater than said predetermined proportion and sufficient to maintain the stability of the dispersed resin in the composition thereby prolonging the operability of the coating composition.

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Inventors: Hall, Wilbur S. (Plymouth Meeting, PA, US)

Application Number: 365699
Filing Date: 1973-05-31
Publication_date: 1976-02-03
Assignee: Amchem Products, Inc. (Ambler, PA)
Primary Class(es): 427/375 427/309, 427/345, 427/435
Other Classes:
US Patent Ref:

3420715	Jan, 1969	Ayres	148/6.
3514343	May, 1970	Bauman	148/6.
3585084	Jun, 1971	Steinbrecher et al.	148/6.
3592699	Jul, 1971	Steinbrecher et al.	148/6.
3647567	Mar, 1972	Schweri	148/6.

Other Refs: 1,099,461

Jan, 1968	UK

Primary Examiner: Gwinnell, Harry J.
Assistant Examiner:
Attorney: Synnestvedt & Lechner