"poly (oxyalkylene) urethane surfactant, process for preparing surfactants, composition, aqueous and oily formulations and seed" The present invention relates to poly (oxyalkylene) urethane surfactants of formula (i) r 2 -x-ochn- [ r1-nhco-o - [(ch2) qo] x-met-] nr1-nhco-x-r2 (i), wherein r1 is an alkylene radical, a cycloalkylene radical or an arylene radical； x is -o- or -nh-； R 2 is a straight or branched (C 1 -C 4) alkyl radical monosubstituted by a group selected from: sulfo, carboxyl and [n, n-di (C 1 -C 4) alkyl] amino, or disubstituted by: carboxyl； carboxyl and hydroxyl； carboxyl and mercapto； or, if x = -o-, r2 may also be defined as [r3-o-known-r1-nhco-o-] mr4 wherein r3 is a straight or branched (C1-C4) alkylene radical, monosubstituted by cooh, especially a -ch2- [c (cooh) (ch3)] -ch2- radical, r1 is as defined above, and r4 is a c2-c22 alkyl or a -ch2- [c (cooh) (ch3)] - radical ch2-oh, em = an integer from 1 to 10； n = an integer from 1 to 7； q = an integer from 3 to 5； and x = an integer from 10 to 70； and their water soluble or water dispersible salts as described with a solubilizer and stabilizer in the active ingredient formulations.resumo “tensoativo de poli(oxialquileno)uretano, processo para preparar os tensoativos, composição, formulações aquosa e oleosa e semente” a presente invenção se refere aos tensoativos de poli(oxialquileno)uretano de fórmula (i) r2-x-ochn-[r1-nhco-o-[(ch2)q-o]x-conh-]nr1-nhco-x-r2 (i), em que r1 é um radical alquileno, um radical cicloalquileno ou um radical arileno； x é o -o- ou -nh-； r2 é um radical alquila (c1-c4) linear ou ramificado, monossubstituído por um grupo selecionado a partir de: sulfo, carboxila e [n,n-di-alquila (c1-c4)]amino, ou dissubstituído por: carboxila； carboxila e hidroxila； carboxila e mercapto； ou, se x = -o-, r2 também pode ser definido como [r3-o-conh-r1-nhco-o-]mr4 em que r3 é um radical alquileno (c1-c4) linear ou ramificado, monossubstituído por cooh, especialmente um radical -ch2-[c(cooh)
