Polyurethane rubbers vulcanizable by peroxides or sulphur with i

Details Polyurethane rubbers vulcanizable by peroxides or sulphur with i Polyurethane rubbers vulcanizable by peroxides or sulphur with i

1997-09-23

1998-06-02

Gorr, Rachel

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...

525453, C08G 1842

Patent

active

057601585

ABSTRACT:
Polyurethane rubbers are disclosed vulcanizable by peroxide and/or sulphur, the vulcanized rubber having improved low temperature compression set properties and low gas permeability. The vulcanizable polyurethane rubbers are made by mixing
(A) 1.0 mol of polyester glycol having a molecular weight of 1500 to 7000 consisting of adipic acid and 2-methylpropanediol-1,3 in combination with cyclohexyldimethanol and/or propanediol. The mol ratio of methylpropanediol to cyclohexyldimethanol and/or propanediol can vary from 70 to 30 to 30 to 70%.
(B) 0 to 2.5 mols of a diol having a molecular wright of 60 to 200; and
(C) 0.95 to 3.5 mols of diisocyanate with a molar ratio of isocyanate group in (C) to the isocyanate-reactive groups in (A) and (B) of 0.95 to 1.02.

REFERENCES:
patent: 3043807 (1962-07-01), Snyder et al.
patent: 4639471 (1987-01-01), Hirai et al.
patent: 5516549 (1996-05-01), Jasenof et al.

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