Process for preparing high trans, trans-isomer containing 4,4'-d

Details Process for preparing high trans, trans-isomer containing 4,4'-d Process for preparing high trans, trans-isomer containing 4,4'-d

1990-04-19

1991-01-08

Brust, Joseph Paul

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

Organic compounds

Isocyanate esters

560336, C07C26320

Patent

active

049837630

ABSTRACT:
The present invention is directed to a simple process for preparing a 4,4'-diisocyanato dicyclohexylmethane containing at least 90% by weight of the trans, trans-isomer. More particularly, the process comprises:

REFERENCES:
patent: 2494563 (1950-01-01), Kirk, Jr. et al.
patent: 2606925 (1952-08-01), Whitman
patent: 3153088 (1964-10-01), Arthur
patent: 3155724 (1964-11-01), Arthur
patent: 3384661 (1968-05-01), Arthur
patent: 3393236 (1968-07-01), Kuszewski
patent: 3789032 (1974-01-01), Hoeschele
Byrne et al; A Study of Aliphatic Polyurethane Elastomers Prepared from Diisocyanate Isomer Mixtures; Rubber Chemistry and Technology; pp. 985-996, vol. 58(1985).
Wong et al; Structure-Property Relationships of Transparent Aliphatic Polyurethane Elastomers From the Geometric Isomers of Methylene BIS(4-Cyclohexyl Isocyanate); Advances in Urethane Science and Technology, vol. 9, 1984 pp. 77-101.

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