Metal patching composition and method
OwnerJohn F. Postinventor
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Abstract
A metal patching method and composition wherein the method comprises mixing two components and then heating to cure the mixture, one of the components containing a diazo dye which changes color when the mixture is cured. The composition of one component includes a bisphenol A epoxy resin, a diazo dye and a flow controlling agent of the temperature insensitive type, and the second component includes a polyamide resin and a flow controlling agent of the temperature insensitive type.
Claims7
A resinous metal patching material formed by the heat curing of two admixed components, the first component including bisphenol A epoxy resin and a diazo dye, the second component being a polyamide resin having an amine number of between 90 and 350, both components also including a heat insensitive mineral product to increase the thixotropic properties of the components.
A metal patching resinous composition which undergoes a color change upon curing, the composition being formed by mixing substantially equal volumes of a bisphenol A epoxy resin component and a polyamide resin component and then heating to initate the cure, the improvement comprising:
- a. said bisphenol A epoxy resin component being stable at room temperature and including a diazo dye, said diazo dye being Solvent Red 24 having a C.I. number of 26105;
- b. said polyamide resin component including a polyamide resin having an amine number of between 90 and 350;
- and
- c. said polyamide resin and diazo dye being selected such that the reaction between said bisphenol A epoxy resin and polyamide resin is substantially complete in the same time interval as the reaction producing a color change of said diazo dye.
Dependencies are inferred from the claim text.