Process for lightening the color of polymeric diphenylmethane di

Details Process for lightening the color of polymeric diphenylmethane di Process for lightening the color of polymeric diphenylmethane di

1999-03-24

1999-11-30

Seidleck, James J.

Organic compounds -- part of the class 532-570 series

Organic compounds

Isocyanate esters

210748, 204901, 2041582, 20415821, 522913, 528 44, C07C26300, B10D 3300

Patent

active

059945796

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.

REFERENCES:
patent: 4465639 (1984-08-01), Hatfield, Jr.
patent: 5312971 (1994-05-01), Adkins et al.
patent: 5583251 (1996-12-01), Buysch et al.

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