Robert C Dereamus

US Patent:

54982820, Mar 12, 1996

Filed:

Oct 3, 1994

Appl. No.:

8/317212

Inventors:

Richard E. Miller - Nazareth PA
Robert C. Dereamus - Tatamy PA

Assignee:

Binney & Smith Inc. - Easton PA

International Classification:

C09D 1102

US Classification:

106 22B

Abstract:

Pan paints and associated color-changing systems are disclosed. In a first embodiment, the color-changing system comprises an undercolor pan paint coloring composition comprising an undercolor dye whose coloring ability is destroyed in the presence of a pH of about 10 or greater and/or in the presence of a reducing agent; and an overcolor composition comprising a colorant capable of maintaining its characteristic color in the presence of a pH of about 10 or greater and/or in the presence of a reducing agent, and a base such that the pH of the overcolor composition is about 10 or greater and/or a reducing agent. In a second embodiment, the color-changing system comprises an undercolor coloring composition comprising an undercolor dye whose coloring ability is destroyed in the presence of a pH of about 4 or less; and an overcolor coloring composition comprising a colorant capable of maintaining its characteristic color in the presence of a pH of about 4 or less and an acid such that the pH of the overcolor coloring composition is about 4 or less; wherein one or both of the coloring compositions is a pan paint.