Method for preventing coloration of diphenylmethane diisocyanate

Details Method for preventing coloration of diphenylmethane diisocyanate Method for preventing coloration of diphenylmethane diisocyanate

1993-12-15

1994-10-25

Chang, Celia

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

Organic compounds

Isocyanate esters

560330, 560331, 546222, C07C26514, C07D21100

Patent

active

053591291

ABSTRACT:
A method for preventing the coloration of a diphenylmethane diisocyanate compound, which comprises adding, to the diphenylmethane diisocyanate compound, a hindered amine compound of the formula: ##STR1## wherein R.sup.1 and R.sup.3 are, the same or different, each a hydrogen atom or a C.sub.1 -C.sub.8 hydrocarbon group,

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AN 84-118563 & JP-A-59059 022 (Nippon Polyurethane KK) Abstract (1984).
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Chemical Abstracts, vol. 115, No. 18, Nov. 4, 1991, Columbus, Ohio, US; abstract No. 194288m, Y. Abe et al. `Thermal recording material using piperidine derivative` p. 772; abstract and JP-A-03 069 392 (Oji Paper Co.).

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