| http://www.w3.org/ns/prov#value | - 2,4- and 2,6-hexahydrotoluene diisocyanate and their mixtures, 4,4'-, 2,2'- and 2,4'-dicyclohexylmethane diisocyanate and their mixtures; and preferably, aromatic di- and polyisocyanates such as 4,4'-, 2,4'- and 2,2'-diisocyanatodiphenylmethane and their mixtures, 2,4- and 2,6-diisocyanatotoluene and their mixtures, 1,5-diisocyanatonaphthalene, polyphenyl-polymethylene polyisocyanates, 2,4,6-trii
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