Commercially Available BONA Pigment Lakes

As with p-naphthol pigment lakes, there is only a limited number of BONA pigment lakes that are marketed in large volume. Two of these pigments, however, maintain an important position within the pigments industry. Table 20 lists the currently available BONA pigment lakes. 

the barium salt, is a coloristically versatile product. It affords light yellowish to medium red shades, depending on the specific surface area of the product. Fastness to a number of common organic solvents, such as esters, ketones, and aliphatic and aromatic hydrocarbons, is good. However, P.R.48 1 shows only poor resistance to soap, alkali, and acid. 

The main field of application for P.R.48 1 is in printing inks and plastics. In order to enhance the transparency in print and to reduce the strong tendency of the prints to bronze, pigments that are targeted for use in printing inks are frequently supplied in resinated form. 

48 1 is recommended especially for use in LDPE. Besides, it also affords colorations of medium tinctorial strength in PE. 0.34% pigment is required to formulate 1/3 SD colorations with 1% Ti02. Comparative values are listed for a number of other pigments. Problems may occur during vulcanization with open steam in the presence of P.R.48 1. The pigment bleeds into the wrapper (Sec. 1.8.3.6). 

Paint manufacturers frequently use P.R.48 1 in inexpensive industrial paints, in which the pigment exhibits good fastness to overpainting. The lightfastness in full shade equals step 5-6 on the Blue Scale, but the pigment loses its fastness to light rapidly as the TiOz content increases. P.R.48 1 is not recommended for exterior application. 

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Table 20 Commercially available BONA pigment lakes.

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