Process for the preparation of polyurea-polyurethane elastomers

Details Process for the preparation of polyurea-polyurethane elastomers Process for the preparation of polyurea-polyurethane elastomers

1991-05-17

1992-08-25

Kight, III, John

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

Synthetic resins

Cellular products or processes of preparing a cellular...

521163, 521164, 521170, C08G 1800

Patent

active

051419670

ABSTRACT:
The present invention relates to a process for preparing polyurea-polyurethane elastomers comprising reacting in a closed mold, in accordance with the reaction injection molding technique at an isocyanate index of about 95 to about 110, an isocyanate prepolymer having an isocyanate content of about 5 wt. % to 10 wt. % and a molecular weight range of about 1000 to 4000 with a diamine chain extender having no isocyanate-reactive groups other than amino groups in the substantial absence of compounds having isocyanate-reactive groups other than amino groups. The present invention further relates to the polyureapolyurethane elastomers produced by the process of this invention.

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Polyurethane Handbook, Edited by G. Oertel (Hanser Publishers, Munich, Vienna and New York, 1985), pp. 352-326.

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