Process for lightening the color of polymeric diphenylmethane diisocyanate and the use of brightened diphenylmethane diisocyanate in the production of polyurethane
AssigneeBayer Aktiengesellschaft
InventorsJuan Morell Torrel, Salvador Vidal Rodriguez, Vicente Requena Alda
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Abstract
A process for lightening (or decreasing) the color of diphenylmethane diisocyanate by irradiation with light having a wavelength of from 250 nm to 2,500 nm is described. This invention also relates to the use of this brightened diphenylmethane diisocyanate as the isocyanate component in a process for the production of polyurethane plastics by the isocyanate polyaddition process.
Claims7
A process for decreasing the color of polymethylene poly(phenyl isocyanate) comprising treating polymethylene poly(phenyl isocyanate) with light having a wavelength in the range of from about 250 nm to about 2,500 nm.
Dependencies are inferred from the claim text.