Piperazine derivatives as chain extenders in polyurea elastomer

Details Piperazine derivatives as chain extenders in polyurea elastomer Piperazine derivatives as chain extenders in polyurea elastomer

1990-05-29

1992-01-21

Kight, III, John

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...

528 60, 528 76, 528 77, 521 51, 521159, 521160, 521163, 521167, C08G 1832, C08G 1816, C08G 1814

Patent

active

050829173

ABSTRACT:
A polyurea elastomer is disclosed. The elastomer includes an isocyanate, an amine terminated polyoxyalkylene polyol, and a chain extender. The isocyanate is preferably a quasi-prepolymer of an isocyanate and a material selected from at least one polyol, a high molecular weight polyoxyalkyleneamine or a combination thereof. The chain extender includes a minor amount of a tetraalkylpiperazine and a major amount of diethyltoluenediamine. A one-step method of making the tetraalkylpiperazine and tetraalkylpiperazinone is also disclosed. The method includes reacting a 2-amino-2-alkyl-1-alkanol in the presence of a nickel-iron-copper-manganese catalyst.

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patent: 4474901 (1984-10-01), Dominguer
patent: 4530941 (1985-07-01), Turner et al.
patent: 4689356 (1987-08-01), Peffley et al.
patent: 4801674 (1989-01-01), Scott, Jr. et al.
patent: 4806615 (1989-02-01), Rice et al.
patent: 4902768 (1990-02-01), Gerkin et al.

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