Infrared Spectra of U.S. Automobile Original Topcoats (1974–1989): V. Identification of Organic Pigments Used in Red Nonmetallic and Brown Nonmetallic and Metallic Monocoats—DPP Red BO and Thioindigo Bordeaux

EM Suzuki

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Cultural Heritage Materials Analysis Spectroscopy and Chemometric Analyses Pigment Synthesis and Properties

Abstract

Abstract As part of a study of the chemical compositions of U.S. automobile original topcoats (1974 to 1989) using infrared spectroscopy, a number of organic pigments used in these finishes have been identified. The topcoats examined were single-layer finishes (monocoats) from the Reference Collection of Automotive Paints, and pigments from the benzimidazolone and quinacridone families were previously identified. The in situ identification of two other organic pigments used in these finishes, DPP Red BO and Thioindigo Bordeaux, is described here. DPP Red BO is a relatively new pigment which was first marketed in 1987, and it was only identified in two red nonmetallic enamels produced in 1989, the last year covered in this study. It is now quite common in automotive paints and its presence in an unknown original finish indicates that a fairly recent vehicle (most likely from the 1990s) was the source. In contrast, Thioindigo Bordeaux, which was identified in a few red and brown nonmetallic and brown metallic enamels, was more common in the 1950s and 1960s but was largely replaced by Quinacridone Violet in the 1970s. It is no longer used much in automotive paint. Spectra of several DPP automotive paint pigments introduced after 1989 are also presented and discussed.

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References

1976The Classification of Automobile Paint by Diamond Window Infrared Spectrophotometry Part I: Binders and Pigments 1976The Classification of Automotive Paint by Diamond Window Infrared Spectrophotometry Part II Automotive Topcoats and Undercoats 1996Infrared Spectra of U.S. Automobile Original Topcoats (1974–1989): I. Differentiation and Identification Based on Acrylonitrile and Ferrocyanide C≡N Stretching Absorptions 1997Infrared Spectra of U.S. Automobile Original Topcoats (1974–1989): III. In Situ Identification of Some Organic Pigments Used in Yellow, Orange, Red, and Brown Nonmetallic and Brown Metallic Finishes—Benzimidazolones 1996Infrared Spectra of U.S. Automobile Original Topcoats (1974–1989): II. Identification of Some Topcoat Inorganic Pigments Using an Extended Range (4000-220 cm−1) Fourier Transform Spectrometer 1998Infrared Spectra of U.S. Automobile Original Topcoats (1974–1989): IV. Identification of Some Organic Pigments Used in Red and Brown Nonmetallic and Metallic Monocoats—Quinacridones 1976The Classification of Automotive Paint by Diamond Window Infrared Spectrophotometry Part III Case Histories

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1999Infrared Spectra of U.S. Automobile Original Topcoats (1974–1989): VI. Identification and Analysis of Yellow Organic Automotive Paint Pigments—Isoindolinone Yellow 3R, Isoindoline Yellow, Anthrapyrimidine Yellow, and Miscellaneous Yellows 2021Infrared spectra of North American automobile original finishes. XI: In situ identification of perylene pigments—Analysis of Perylene Maroon (C.I. Pigment Red 179) and alumina-based red pearlescent pigments

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