Molded polyurea articles and a process for the production thereo

Details Molded polyurea articles and a process for the production thereo Molded polyurea articles and a process for the production thereo

1987-04-10

1988-05-24

Welsh, Maurice J.

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

Synthetic resins

Cellular products or processes of preparing a cellular...

264 51, 264DIG14, C08G 1814

Patent

active

047466812

ABSTRACT:
Molded polyurea foam parts having densities of from 200 to 600 kg/m.sup.3 and a compact skin are made by reacting a polyisocyanate component with a polyamine component in a closed mold at an isocyanate index of from 70 to 130. The polyamine component generally includes (1) an aminopolyether having a molecular weight of from 1800 to 12,000 and 2 to 3 isocyanate reactive groups of which at least 90% are aromatically bound primary and/or secondary amino groups, (2) an aromatic diamine, (3) a foaming agent and optionally (4) known auxiliaries and additives. The polyisocyanate component includes any aromatic di- and/or poly-isocyanate. Parts produced by this process have excellent mechanical properties and a well-defined solid skin.

REFERENCES:
patent: 4218543 (1980-08-01), Weber et al.
patent: 4396729 (1983-08-01), Dominquez et al.
patent: 4433067 (1984-02-01), Rice et al.
patent: 4442235 (1984-04-01), Taylor et al.
patent: 4444910 (1984-04-01), Rice et al.
patent: 4569982 (1986-02-01), Grogler et al.
Becker/Braun, "Kunststoff-Handbuch 7", Polyurethane, Publishers, Dr. G. Oertel, 1983, pp. 325-333.

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