Process for the production of non-foamed moldings

Details Process for the production of non-foamed moldings Process for the production of non-foamed moldings

1986-02-26

1988-01-19

Hoke, Veronica P.

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

Synthetic resins

At least one aryl ring which is part of a fused or bridged...

524871, 528 57, C08K 912

Patent

active

047205199

ABSTRACT:
Urea-modified bubble-free moldings based on polyisocyanate polyaddition products are made by reacting (a) an organic polyisocyanate with (b) a polyhydroxyl compound and/or polyepoxide in the presence of (c) a water chain extender in the form of an aqueous alkali aluminosilicate or an aqueous alkali-alkaline earth aluminosilicate of the zeolite type in a mold using cast resin technology. The reaction components are used in quantities such that the equivalent ratio of isocyanate to hydroxyl and/or epoxide groups is from 1.1:1 to 6.1. The chain extender is used in a quantity such that the amount of water is at least equivalent to the excess of isocyanate. These moldings may be made by a one-shot or a two-shot process. These moldings are characterized by better mechanical properties such as tensile strength and elongation than prior art moldings.

REFERENCES:
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patent: 3755222 (1973-08-01), Gruker et al.
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patent: 4251428 (1981-02-01), Recker et al.
patent: 4336180 (1982-01-01), Recker et al.
patent: 4551498 (1985-11-01), Yeater et al.
Polyurethane Handbook-pp. 388-402, Gunter Oertel, Editor, Hanser Pub., NY, (1983).
Kunststoff-Handbuch, vol. VII, "Polyurethane" by Becker/Braun, Carl Hanser Verlag, Munich/Vienna (1983), pp. 410 to 425.

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