Polyurea-polyurethane from a mixture of a polyol, an aromatic di

Details Polyurea-polyurethane from a mixture of a polyol, an aromatic di Polyurea-polyurethane from a mixture of a polyol, an aromatic di

1981-09-18

1983-02-15

Welsh, Maurice J.

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

Synthetic resins

Cellular products or processes of preparing a cellular...

521 51, 528 64, C08G 1814

Patent

active

043742106

ABSTRACT:
The use of certain prepolymers of 4,4'-methylenebis(phenyl isocyanate), in place of the latter diisocyanate itself in the preparation of polyurethane-polyureas using aromatic diamine extenders, has a number of advantages particularly when the compositions are prepared by reaction injection molding techniques using two streams of reactants. The principal advantages are (i) a useful increase in gel time and (ii) a ratio of amounts of the two reactant streams which more nearly approaches 1:1.
This latter factor not only improves the efficiency of mixing of the components in the mixing head but, together with the longer gel time, significantly increases the output of mixed reactants per unit of time. The prepolymers of 4,4'-methylenebis(phenyl isocyanate) employed to achieve the above results are those derived from polyoxyethylene polyoxypropylene polyether diols and triols (MW=1000-10,000), polytetramethylene glycols (MW=600-5,000) and polyester diols and triols (MW=500-8,000).

REFERENCES:
patent: 3428610 (1969-02-01), Klebert
patent: 4218543 (1980-08-01), Weber et al.
patent: 4298701 (1981-11-01), Meyborg et al.
Frisch et al., (Ed.), Advances in Urethane Sci. & Technology, Technomic, Westport, Conn., vol. 4, 1976, pp. 134 and 135.

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