Abstract:
s: Disclosed is a process for preparing carbonic diester comprising the formation of carbonic diester by the vapor phase catalytic reaction of an alkyl nitrite and carbon monoxide in the presence of a solid catalyst, wherein platinum group metal ion in the solid catalyst is exchanged on an ion exchange zeolite carrier.
Abstract:
Disclosed is a liquid polyether carbonate diol compound which is useful for producing a thermoplastic polyurethane which is excellent in weather resistance, flexibility and stretchability. Such a liquid polyether carbonate diol compound is a reaction product between (1) a carbonate compound and (2) a polyether diol compound having, in a molecule structure, a constitutional unit: -RO- (a) and another constitutional unit: -(CH2)2-O- (b) and/or -CH2CH(CH3)-O- (c) (wherein n and m representing respective average numbers of moles of the constitutional units (b) and (c) per 1 mole of the constitutional unit (a) satisfy 0