Preparation of primary aralkyl urethanes and ureas and isocyanat

Details Preparation of primary aralkyl urethanes and ureas and isocyanat Preparation of primary aralkyl urethanes and ureas and isocyanat

1986-11-03

1989-11-07

Siegel, Alan

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

Organic compounds

Isocyanate esters

560345, 560 24, 560 25, 560 26, 560 28, 560 33, 564 32, 564 56, 564255, 548537, 546192, 546205, 540356, 540531, C07C11900, C07C12506, C07C12701

Patent

active

048794104

ABSTRACT:
A process is disclosed for the preparation of aralkyl mono- and diurethanes or ureas by carbamylmethylation, or acid-catalyzed addition at a temperature of 40.degree. C. to about 100.degree. C. of formaldehyde and esters of carbamic acid to aromatic hydrocarbons. Aralkyl carbamates and ureas formed by this process can be cracked directly to produce aralkyl diisocyanates, or hydrogenated and then cracked to produce aliphatic diisocyanates, or reacted directly with polyols to produce polyurethanes by functioning as blocked isocyanates.

REFERENCES:
patent: 3290350 (1966-12-01), Hoover
patent: 3919279 (1975-11-01), Rosenthal et al.
patent: 3992430 (1976-11-01), Bacskai
patent: 4039568 (1977-08-01), Sakai et al.
patent: 4130577 (1978-12-01), Hamashima et al.
patent: 4290970 (1981-09-01), Merger et al.
patent: 4361518 (1982-11-01), Singh et al.
patent: 4379767 (1983-04-01), Alexanian et al.
patent: 4439616 (1964-03-01), Singh et al.
patent: 4459236 (1984-07-01), Merger et al.
patent: 4570012 (1986-02-01), Singh et al.

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