Reference

Properties of n-butyl carbamate as a Kraft paper modifier

Properties of n-butyl carbamate as a Kraft paper modifier. Miyoshi, Akira (Hitachi, Ltd., Tokyo, Japan).Some commonly used reagents like 543-28-2 and 1746-77-6 are used in this experiment. Kami Pa Gikyoshi, 31(4), 229-35 (Japanese) 1977. CODEN: KAGIAU. DOCUMENT TYPE: Journal CA Section: 43 (Cellulose, Lignin, Paper, and Other Wood Products) Bu carbamate (I) [592-35-8], iso-Bu carbamate (II) [543-28-2], and iso-Pr carbamate (III) [1746-77-6] were used to prevent the thermal degrdn. of kraft paper insulators, and the effect of prevention decreased in the order I > II > III. The N and hydrocarbon parts of the carbamates were involved in the prevention of degrdn. I did not corrode polyvinyl formal or wires. .

Multistage process for producing hexamethylene diisocyanate and/or isomeric diisocyanates

Multistage process for producing hexamethylene diisocyanate and/or isomeric diisocyanates. Merger, Franz; Towae, Friedrich; Hellbach, Hans; Koehler, Waldemar; Isbarn, Gunther (BASF A.-G. , Fed. Rep. Ger.). Ger. Offen. DE 3314788 A1 25 Oct 1984, 19 pp. (German). (Germany). CODEN: GWXXBX. CLASS: IC: C07C119-042; C07C118-00. APPLICATION: DE 83-3314788 23 Apr 1983. DOCUMENT TYPE: Patent CA Section: 35 (Chemistry of Synthetic High Polymers) Section cross-reference(s): 23 In the title process, requiring no COCl2, diamines are treated with urea [57-13-6] and alcs. in the presence of dialkyl carbonates and/or alkyl carbamates to give diurethanes which are cracked in the vapor phase to diisocyanates, with recycle of intermediates and excess starting materials. Thus, stirring urea 1044, 1,6-hexanediamine [124-09-4] 1015, and BuOH [71-36-3] 0.029 kg in the presence of recovered BuOH, di-Bu hexamethylenedicarbamate (I) [3066-67-9], (BuO)2CO [542-52-9], H2NCO2Bu [592-35-8], and oligourethanes at 215-220°/6-8 bar with NH3 distn., distn. and recycle of 3.2 kg BuOH/h, stripping of 0.98 kg/h I, (BuO)2CO, and H2NCO2Bu with N, and distg. at 260-270°/33 mbar gave I, which was cracked over V2A mesh rings at 410° to give hexamethylene diisocyanate (II) [822-06-0] contg. 5.4% monoisocyanate-monourethane. A 2nd distn. gave 1395 kg II/h with purity >99%.