Here is the start of a new thread and a new discussion on a new way of tinting optical plastic lenses and other plastic materials that are surface tint able.
On October 15th 2002, the US patent office has issued Patent No 2246505 on "Tinting plastic articles" with the following abstract:
Plastic articles, especially plastic optical lenses are tinted by immersing the plastic article in an aqueous dispersion of tinting agent and exposing the dispersion and immersed article to microwave radiation to bring the dispersion to ebullition; the ebulittion is maintained for at least 2 seconds with transfer of tinting agent from the dispersion to the article to tint the article; the tinted article is removed from the dispersion and rinsed with water. The method achieves tinting in significantly shorter times than conventional methods and employs water-based dispersions thereby avoiding emmission of vapours of organic solvents.
Here is the basis for discussions and I will go more into details tomorrow if nobody has any objections.
Chris Ryser
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