Elastomeric polyurethane compositions and seals

Details Elastomeric polyurethane compositions and seals Elastomeric polyurethane compositions and seals

1978-06-05

1980-01-29

Cockeram, H. S.

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...

220 81R, 277DIG6, C08G 1867, C08G 1876, B65D 5306

Patent

active

041862619

ABSTRACT:
This invention relates to improved elastomeric polyurethane compositions and seals which show increased resistance to the degrading effects of contact with fluids containing phosphate esters relative to conventional polyurethane elastomers. The elastomeric composition includes the reaction product of 3,3'-dimethyl-4,4'-diphenyl diisocyanate; one or more polycaprolactone polyols; and a chain extender which includes a linear aliphatic compound defining a chain of carbon atoms which includes at least one unsaturated carbon-carbon bond and which is terminated at each end with a hydroxyl group. An example of a preferred chain extender is 1,4-dihydroxy-2,3-dibromo-2-butene.

REFERENCES:
patent: 3100759 (1963-08-01), Boussu et al.
patent: 3129200 (1964-04-01), Muller et al.
patent: 3192185 (1965-06-01), Achterhof et al.
patent: 3654347 (1972-04-01), Kincaid et al.
patent: 3723392 (1973-03-01), Konig et al.
patent: 3775354 (1973-11-01), Hostettler et al.
patent: 3834578 (1974-09-01), Smith et al.
patent: 3899467 (1975-08-01), Bonk et al.
Wright et al., Solid Polyurethane Elastomers, Maclaren & Sons, London (1969), pp. 239-242, 260-264 and Plate 10.

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