| abstract |
Polyether polyamines of formula (I) are new: (where R1 and R2 are the same or different, and are C8-C30-alkyl, -2hydroxyalkyl, or-alkenyl, or C8-C24 alkoxypropyl; m and n are 2 or 3; R3 is CH3 or H; and (o+p+q+r) is 4-600). Also claimed are their prepn. by the reaction of R1-NH-(CH2)m-NH-(CH2)2-NH-(CH2)n-R2 (II) with ethylene oxide or propylene oxide, and their uses as dispersing agents and in gas- and oilfield applications.. Where (o+p+q+r) is 60-450, the cpds. are useful in low concns. as dispersing agents for organic and inorganic pigments, dyestuffs, and colour brighteners. The dispersions can be used in dyeing with dispersion colours, pigment printing of textiles, and in flexo- or gravure printing. When (o+p+q+r) is 4-150, the cpds. and their salts are useful in oilfields as corrosion inhibitors, demulsifiers, and acid retarding agents (these moderating the attack of e.g. limestone by pumped-in acids). |