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...
Patent
1984-05-14
1985-12-03
Cockeram, Herbert 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...
252182, 528 44, 528 48, 528 53, 528 54, 528 55, 528 56, 528 58, 528 63, 528 64, 528 67, 528906, C08G 1876, C08G 1810, C08G 1816
Patent
active
045567034
ABSTRACT:
A prepolymer curable with a hydroxyl or amine functional curative to form a polyurethane elastomer composition having low heat buildup characteristics is disclosed. Specifically, the polyurethane prepolymer has terminally reactive isocyanate groups and is prepared by reaction of polymeric diol with a stoichiometric excess of a mixture of the 2,6- and 2,4-isomers of tolylene diisocyanate, said mixture containing from about 50 to about 90 wt % of the 2,6-isomer.
The invention also relates to a polyurethane elastomer composition comprising the aforementioned prepolymer and a curingly effective amount of a curative selected from the group consisting of aromatic diamines, hydroxy functional compounds, and mixtures thereof, and optionally, from about 0.01 to 1 part of catalyst per hundred parts of prepolymer.
Also disclosed are articles of manufacture produced from the above composition, as well as compositions wherein the mixture contains 40 to 100 wt % of the 2,6-isomer.
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Franz Curtis A.
Megna Ignazio S.
American Cyanamid Company
Cockeram Herbert S.
Jeanette Henry C.
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