ific amine compounds of the formula: ##STR1## wherein R1 is a methyl or ethyl and R2 is hydrogen or methyl such that when...http://www.google.es/patents/US4450246?utm_source=gb-gplus-sharePatente US4450246 - Novel polyurethane catalysts in polyurethane foam process B???squeda avanzada de patentes N???mero de publicaci???nUS4450246 ATipo de publicaci???nConcesi???n N???mero de solicitudUS 06/436,81