Process for tinting, dyeing or doping of moulded components made of transparent (co)polyamides in aqueous dye bath
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United States of America Patent
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Issued Date -
Oct 19, 2006
app pub date -
Apr 12, 2006
filing date -
Apr 14, 2005
priority date (Note) -
Abandoned
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Abstract
The present invention relates to a novel composition of dye baths or processing baths and a process for tinting, dyeing or doping of moulded components with functional additives in these aqueous dipping baths or processing baths. The moulded components contain transparent or translucent (co)polyamides. If the moulded components should be tinted or dyed according to an embodiment of the invention, the dyeing can be performed as homogeneous dyeing or as gradient dyeing. The process according to the present invention is particularly suitable for producing high-value objects like ophthalmic lenses, sun lenses for eyeglasses, magnifying glasses, all kinds of inspection glasses, polarization films and display films, particularly if changing depths of color (gradients) are desired. This generating of a dyeing gradient requires dyeing in a dipping process, whereby the desired depth of color is achieved by multiple times of dipping the surface areas of the moulded article in the dye bath.
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