'Blue Undertone Enhancement of Black and Grey PP Injection Molded Parts for Automotive with Ultramarine Blues'

摘要

Polypropylene has become the leading polymer for automotive applications. Black and grey are the most popular colors in injection molded parts for that industry. In the case of blacks, desired properties are: high jetness, high bluish undertone, good mechanical properties, good surface appearance, good weatherability and high gloss (depending on the application). The highest performing Carbon Blacks all alone cannot reach the target black color requested by the automotive industry. Either they have high jetness but lack blue undertone or they have high blue undertone but lack jetness. This paper intends to prove that High Performance Ultramarine Blues are a very suitable option to enhance the blue undertone of black colored PP injection molded parts while not damaging other key characteristics as jetness, mechanical properties and weather fastness. Moreover, the paper highlights the benefits High Performance Ultramarine Blues show when formulating greys by increasing its blue undertone and hence improving aesthetics by removing the yellowish undertone more associated to brownish/dirty greys.