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Primary Examiner: Kendall, Ralph S.
Assistant Examiner:
Attorney: Carter; J. G.

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Title: Weldable coating compositions

Abstract: An improvement in a weldable coating for metallic substrates containing a high molecular weight epoxy or phenoxy resin, an electroconductive pigment such as zinc and a diluent such as a glycol ether wherein the improvement resides in replacing at least about 70 weight percent of said resin with a composition containing a low molecular weight epoxy resin such as the diglycidyl ether of bisphenol A, a phenolic hydroxyl-containing compound such as a phenolic hydroxyl terminated adduct of a diglycidyl ether of a diphenolic compound such as bisphenol A and a catalyst for effecting the reaction between the epoxy resin and the adduct.

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Inventors: Elms, William J. (Lake Jackson, TX, US)
Weitzel, Steven A. (Richwood, TX, US)

Application Number: 937012
Filing Date: 1978-08-25
Publication_date: 1980-01-29
Assignee: The Dow Chemical Company (Midland, MI)
Primary Class(es): 428/416 148/257, 148/265, 252/512, 427/58, 427/386, 428/418, 428/472.1, 428/472.3, 523/428, 525/396, 528/94, 528/103, 528/109
Other Classes:
US Patent Ref:

3110691	Nov, 1963	Fisher	260/22.
3671331	Jun, 1972	Malkin et al.	148/6.
3687894	Sep, 1972	Collings et al.	260/47.
3738862	Jun, 1973	Klarquist et al.	427/390.
3819425	Jun, 1974	De Ridder et al.	148/6.
3849141	Nov, 1974	Palm et al.	148/6.
3907608	Sep, 1975	Barrett et al.	148/6.
3931109	Jan, 1976	Martin	260/47.
3970482	Jul, 1976	Gunn	148/6.
3990920	Nov, 1976	De Ridder et al.	148/6.
4020220	Apr, 1977	Germano	428/472.

Other Refs: Other References: Kennedy, Zincrometal: Coil Coatings Answer to Corrosion, Modern Paint and Coatings, Sep. 1976, pp. 21-26.