139-25-3 Usage
Uses
4,?4''-?Diisocyanato-?3,?3''-?dimethyldiphenylmeth?ane is a reagent used in the synthesis of polyurethane materials.Environmental toxin on US EPA Toxic Release Inventory list (TRI) list.
Reactivity Profile
Isocyanates and thioisocyanates, such as 4,4'-DIISOCYANATO-3,3'-DIMETHYLDIPHENYLMETHANE, are incompatible with many classes of compounds, reacting exothermically to release toxic gases. Reactions with amines, aldehydes, alcohols, alkali metals, ketones, mercaptans, strong oxidizers, hydrides, phenols, and peroxides can cause vigorous releases of heat. Acids and bases initiate polymerization reactions in these materials. Some isocyanates react with water to form amines and liberate carbon dioxide. Base-catalysed reactions of isocyanates with alcohols should be carried out in inert solvents. Such reactions in the absence of solvents often occur with explosive violence, [Wischmeyer(1969)].
Safety Profile
Poison by intravenous
route. A sensitizer. When heated to
decomposition it emits toxic fumes of NOx
and CN-.
Check Digit Verification of cas no
The CAS Registry Mumber 139-25-3 includes 6 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 3 digits, 1,3 and 9 respectively; the second part has 2 digits, 2 and 5 respectively.
Calculate Digit Verification of CAS Registry Number 139-25:
(5*1)+(4*3)+(3*9)+(2*2)+(1*5)=53
53 % 10 = 3
So 139-25-3 is a valid CAS Registry Number.
139-25-3Relevant articles and documents
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Bailey et al.
, p. 794,795 (1956)
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METHOD OF PRODUCING MODIFIED ORGANIC POLYISOCYANATE
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, (2008/06/13)
A modified organic polyisocyanate having isocyanurate rings is produced by adding a trimerization catalyst, an organic phosphite, a surfactant and, if desired, a ferrocene compound to an organic polyisocyanate and/or partially urethanated organic polyisocyanate, converting at most 20 % by weight of all of the isocyanate groups into isocyanurate groups, and adding, if necessary, a terminating agent to the reaction system.
