Low-temperature storage stable liquid diphenylmethane diisocyanates
AssigneeMobay Chemical Corporation
InventorsHelmut F. Reiff, Richard S. Pantone
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Abstract
The instant invention is directed to novel low temperature, storage stable liquid diphenylmethane diisocyanates and to the method of their preparation. The diisocyanates of the instant invention are produced by reacting diphenylmethane diisocyanates having a specified 2,4'-isomer content with propylene glycol or poly-1,2-propylene ether glycols. It has been surprisingly found that the products of the instant invention are both stable and liquid at -5.degree. C for at least 48 hours. In fact, in many instances, the products of the instant invention show no tendency to crystallize even when stored at -22.degree. C for weeks.
Claims22
A diisocyanate compound which is both stable and liquid at -5.degree. C. for at least 48 hours, comprising the reaction product of:
- (a) a diphenylmethane diisocyanate containing from about 15 to about 70 percent by weight of the 2,4'-isomer, and
- (b) a material selected from the group consisting of propylene glycol and poly-1,2-propylene ether glycols.
A process for the production of diisocyanate compounds which are both stable and liquid at -5.degree. C. for at least 48 hours which comprises reacting:
- (a) a diphenylmethane diisocyanate containing from about 15 to about 70 percent by weight of the 2,4'-isomer, and
- (b) a material selected from the group consisting of propylene glycol and poly-1,2-propylene ether glycols.
Dependencies are inferred from the claim text.