Process for the production of polyurethane urea products

Details Process for the production of polyurethane urea products Process for the production of polyurethane urea products

1982-12-23

1983-12-27

Cockeram, H. S.

Synthetic resins or natural rubbers -- part of the class 520 ser

Synthetic resins

From reactant having at least one -n=c=x group as well as...

521129, 521160, 528 54, 528 61, C08G 1879, C08G 1832

Patent

active

044232004

ABSTRACT:
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 comparatively short demolding times. For this purpose, relatively 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: ##STR1## wherein R.sub.1 to R.sub.4, which may be the same or different, represent C.sub.1 -C.sub.4 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-diphenylmethane 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.

REFERENCES:
patent: 4208507 (1980-06-01), Stutz et al.
patent: 4261852 (1981-04-01), Carroll et al.
patent: 4352858 (1982-10-01), Stanley

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