Polycarbamates, process for preparing polycarbamates, and proces

Details Polycarbamates, process for preparing polycarbamates, and proces Polycarbamates, process for preparing polycarbamates, and proces

1994-03-10

1995-09-26

Prescott, Arthur C.

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

Organic compounds

Isocyanate esters

560 25, C07C26100, C07C26300

Patent

active

054535360

ABSTRACT:
Polycarbamates of a polyisocyanate and secondary alcohols are disclosed. These carbamates are characterized in being readily pyrolyzed to form the corresponding polyisocyanate and alcohol with low formation of tars and other by-products. Thus, these polycarbamates can be pyrolyzed under relatively mild conditions, and in the absence of solvent and catalyst.

REFERENCES:
patent: 3234253 (1986-02-01), Cooper
patent: 4290968 (1981-09-01), Leonard
patent: 4487713 (1984-12-01), Spohn
Chin, "New Nonphosgenation Process for MDI by Asahi Chemical Industry" Mar. 1984, Process Economics Program, SRI International, Menlo Park, Calif., 94025, pp. 1-32.
Fukuoka et al. "Isocyanate Without Phosgene", Chemtech, Nov. 1984, pp. 670-676.
SRI Process Evaluation/Reserach Planning Report, 86-T-3, "2.00 A New Process for Methylene Diphenyl Diisocyanate", 1986, pp. 27-58.

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