Bismuth/carboxylic acid catalysts for preparing elastomers

Details Bismuth/carboxylic acid catalysts for preparing elastomers Bismuth/carboxylic acid catalysts for preparing elastomers

1986-03-31

1988-05-03

Welsh, Maurice J.

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

Synthetic resins

Cellular products or processes of preparing a cellular...

528 55, C08G 1814

Patent

active

047420901

ABSTRACT:
This invention is a polyurethane-urea elastomer which is the reaction product of a reaction mixture comprising (1) a liquid active hydrogen-containing composition which comprises a relatively high equivalent weight active hydrogen-containing compound, and an amine-terminated, relatively low equivalent weight compound, (2) a polyisocyanate which is present in an amount to provide about 0.8 to about 1.5 isocyanate groups per active hydrogen-containing group present in the mixture, and (3) a catalytically effective amount of a bismuth carboxylate catalyst.
With the use of the bismuth carboxylate catalyst, excellent pot-life, yet rapid cures are achieved. In addition the so-called "green strength" of the elastomer, i.e., its physical strength at the time of its removal from the mold, is improved with the practice of this invention. Further, the post-cured elastomer exhibits excellent properties.

REFERENCES:
patent: 4556703 (1985-12-01), Megna et al.
patent: 4584362 (1986-04-01), Leckart et al.
patent: 4611044 (1986-09-01), Meyer et al.
Cosan Chemical Corporation "Coscat 83", 1979.
"Cast Urethane Elastomers from Polypropylene Glycols" Rubber Age/vol. 88, No. 3, Dec. 1960.
"A Comparison of Diphenylene Diisocyanate (MDI) and Toluidine Diisocyanate (TDI) Urethane Prepolymers" Plastics & Rubber New, Jan. 1979.

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