| http://www.w3.org/ns/prov#value | - A preparation process of a polyisocyanato-isocyanurate mixture comprising two or more polyisocyanato-isocyanurate represented by the formula (I): ##STR12## wherein R1, R2 and R3 are the same or different and are an alkylene group having from 2 to 12 carbon atoms or a group represented by the formula (II): ##STR13## wherein k is an integer of from 0 to 2, j and m are an integer of from 1 to 5, and
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