Process for the production of elastomeric moldings

Details Process for the production of elastomeric moldings Process for the production of elastomeric moldings

B - Operations, Transporting

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B29C 44/34 (2006.01) C08G 18/08 (2006.01) C08G 18/65 (2006.01) C08K 3/00 (2006.01)

Patent

CA 1123167

Mo-1845 PU-071 PROCESS FOR THE PRODUCTION OF ELASTOMERIC MOLDINGS ABSTRACT OF THE DISCLOSURE The instant invention is directed to a process for the production of elastomeric moldings comprising: (A) introducing a reaction mixture into a closed mold, said reaction mixture comprising: (i) an organic polyisocyanate, (ii) a hydroxyl group containing compound having a molecular weight of from 1800 to 12,000, (iii) a catalyst for the reaction between hy- droxyl groups and isocyanate groups, (iv) an active aromatic diamine having at least one alkyl substituent in the ortho- position to a first amino group and two alkyl substituents in ortho-position to a second group, and (v) air and/or nitrogen dissolved under pres- sure in any one or more of Components (i), (ii), (iii) or (iv), (B) allowing said reaction mixture to react in said mold and (C) removing the resultant product from said mold, the improvement wherein in any of Components (i), (ii), (iii) or (iv) which does contain said air and/or nitrogen dissolved therein there is included an inorganic, finely divided, nitro- gen adsorbing agent in an amount sufficient to accelerate the transition of the air and/or nitrogen from the dissolved state to the dispersed state upon release of the pressure (i.e., as Mo-1845 the liquid reacting mixture flows into the mold). It is this dispersed state which allows for adequate blowing during the process. Mo-1845

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