Substantially colorless organic polyisocyanates, processes for t

Details Substantially colorless organic polyisocyanates, processes for t Substantially colorless organic polyisocyanates, processes for t

1985-05-03

1987-01-27

Cockeram, Herbert S.

Synthetic resins or natural rubbers -- part of the class 520 ser

Synthetic resins

From reactant having at least one -n=c=x group as well as...

528 44, 528 73, 528 59, 252182, C08G 1880, C08G 1879

Patent

active

046395024

ABSTRACT:
The present invention relates to substantially colorless organic polyisocyanates, optionally in solution in an inert solvent, having a Hazen color index according to DIN 53 409 of at most 60 and a yellow value according to DIN 6167 of at most 3.0, characterized by a content of about 0.01 to 1 ppm (by weight), based on polyisocyanate, of an organic dye soluble in the polyisocyanate and having an absorption maximum of about 560 to 590 nm or a mixture of such dyes.
The present invention also relates to two processes for preparing the substantially colorless organic polyisocyanates. In the first process, the organic dye is added to the prepared polyisocyanate while in the second process the organic dye is added to the starting materials used to prepare the polyisocyanate. Finally, the present invention is directed to the production of polyisocyanate polyaddition products from the substantially colorless organic polyisocyanates and isocyanate-reactive compounds.

REFERENCES:
patent: 2885420 (1959-05-01), Spiegler
patent: 2885421 (1959-05-01), Spiegler
patent: 2885423 (1959-05-01), Spiegler
patent: 2885424 (1959-05-01), Spiegler
patent: 2885425 (1959-05-01), Spiegler
patent: 3226411 (1965-12-01), Smith
patent: 3226413 (1965-12-01), Smith
patent: 3226414 (1965-12-01), Smith
patent: 3281446 (1966-10-01), Manning
patent: 3384653 (1968-05-01), Erner et al.

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