Method for tinting a sheet of polyurethane

Coating processes – Coating has x-ray – ultraviolet – or infrared properties

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8515, 156 99, 427163, 427164, B05D 704, B05D 340, G02B 110, G02B 522

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active

044541708

ABSTRACT:
A method of tinting a sheet of transparent polyurethane comprising a coloring operation followed by a fixation operation.
The aforesaid coloring operation is carried out through immersion of the polyurethane into a bath maintained under continuous agitation and formed of a dispersion of one or several colorants in an aqueous solution containing a surfactant or wetting agent, while the aforesaid fixation operation is carried out through rinsing in a boiling aqueous solution of sodium alkyl sulfonate of the type known under the mark "Teepol".
The application to a double or composite sheet preformed to a thin laminate, that is to say, one layer of a thermoplastic polyurethane and one other layer of a thermosetting polyurethane.
In a particularly useful embodiment of the invention the tinted polyurethane serves as a selective filter having almost zero transmission in the so-called cutoff range of wavelengths lying between about 350-560 nm. Eyeglasses made from such lenses are useful for victims of aphakia and retinitis pigmentosa.

REFERENCES:
patent: 3236582 (1966-02-01), Ueda et al.
patent: 4166889 (1979-09-01), Fujii et al.

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