P-tmxdi polyurethane elastomers with good compression set...

Details P-tmxdi polyurethane elastomers with good compression set... P-tmxdi polyurethane elastomers with good compression set...

C - Chemistry, Metallurgy

08

G

402/142

C08G 18/10 (2006.01) C08G 18/76 (2006.01)

Patent

CA 1239729

P-TMXDI POLYURETHANE ELASTOMERS WITH GOOD COMPRESSION SET PROPERTIES ABSTRACT Polyurethane elastomer compositions, having a com- pression set less than or equal to about 40% are dis- closed. These polyurethane elastomer compositions comprise the reaction product of: (a) A polyurethane prepolymer having terminally reactive isocyanate groups and formed as a reaction product of polymeric diol with a stoechiometric excess of p-tetramethylxylene diisocyanate (p-TMXDI); with (b) A curatively effective amount of a curative selected from the group consisting of: diethyl- toluenediamine (DETDA), 2,4-bis(p-aminobenzyl)- aniline (BABA), and mixtures thereof; and (c) Optionally, from about 0.01% to about 2% by weight of catalyst, based on the weight of curative These polyurethane elastomers are used in molded articles which are to be used under load as in machine rolls and wheels.

484597

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