C - Chemistry – Metallurgy – 08 – G
Patent
C - Chemistry, Metallurgy
08
G
402/132, 402/142
C08G 18/32 (2006.01) C08G 18/40 (2006.01) C08G 18/76 (2006.01)
Patent
CA 1193040
ABSTRACT OF THE DISCLOSURE This invention relates to a process for the production of polyurethane urea products from isocyanate product blends and preferably less reactive, aromatic diamines, or solutions of aromatic diamines in relatively high molecular weight polyhydroxyl compounds, the reaction components being reacted in a casting process with commercially-reasonable casting times and compara- tively short demolding times. For this purpose, rela- tively high-molecular weight polyhydroxyl compounds, optionally in the presence of low molecular weight diols are reacted with excess quantities of toluene, phenylene or hexamethylene diisocyanate to produce a substantially diisocyanate-free NCO-prepolymer. This NCO-prepolymer is mixed with from 0.1 to 25%, by weight, of less reactive, monomeric tetra-alkyl-diphenylmethane diisocyanates corresponding to the general formula: Image wherein R1 to R4, which may be the same or different, represent C-1-C4 alkyl radicals. These isocyanate blends may be easily processed into elastomer moldings having favorable properties in the casting process using moderately-reactive aromatic diamines from the series of di- to tetra-alkyl-diphenyl- methane diamines and/or dialkyl-toluene diamines and/or using substituted 3,5-diamino-4-alkyl-benzoic acid alkyl esters, optionally dissolved in the relatively high molecular weight polyhydroxyl compounds. Mo-2439
418963
Barnes James M.
Ganster Otto
Aktiengesellschaft Bayer
Marcoux & Sher Swabey Mitchell Houle
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