Desmodur® 4,4 -diphenylmethane

Fig. 15. Viscoelastic behavior of isocyanurate-oxazoiidone resins51). DEN 431 (polyglycidyl ether of phenol-formaldehyde novolac Dow Chemical Co.), EP 4080 (2,2-bis[p-(2,3-epoxypropyloxy)cyclo-hexane]propane Asahi Denka, Ltd.), EP 871 (diglycidyl ester of linoleic dimer acid Shell Chemical Co.), and L-MDI (modified diphenylmethane-4,4 -diisocyanate Desmodur CD Bater AG)...

Polyurethane bulk and thin-film samples are prepared from a two-part PU adhesive formed by polyaddition of Bayer Desmodur CD (89% diphenylmethane-4,4 -diisocyanate 1 with 11% uretoneimine triisocyanate 2 as additive) with a polyol mixture of Bayer Desmophen 2060BD (linear poly(propylene ether) diol... 

Desmodur VK-10 Bayer 66 Mixture of 4,4 -diphenylmethane diisocyanate (MDl) isomers and higher homologues (PMDl)... 

To the tannin/hexamine solution were added the modified GA, GB and GC lignin solutions. The proportion of tannin modified lignin was 50 50 by weight as shown in Table 1. The pMDI (polymeric 4,4 -diphenylmethane diisocyanate) used was Desmodur 44VK from Bayer. The PF resin used in one of the formulations in Table 1 was prepared according to the procedure already presented [20]. 

The most important polyurethane adhesive components are toluene diisocyanate (TDI), 4,4 -diphenylmethane diisocyanate (MDI), p-anisidine diisocyanate (DADI), hexamethylene diisocyanate (HDI) and triphenyl-methane triisocyanate (Desmodur R) (see Fig. 8.1), together with various polyester and polyether glycols. (See Fig. 1.9 of Chapter 1 for the formulae of TDI, MDI and HDI, and Fig. 8.5 for the formula of DADI.) Toluidine diisocyanate (TODI) (Fig. 8.1) is also used. 

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