The addition of substituted anilines to nitro-substituted isocyanates followed by reduction generates new aniline-substituted ureas, which can be further extended in a one- or two-directional iterative manner to form oligomeric ureas based on a m-phenylenediamine monomer. Oligo-ureas with up to eight urea linkages are reported. Fully N-substituted oligo-ureas are crystalline, and the X-ray crystal structures display ring-stacked conformations. H-1 NMR studies indicate that the stacked conformation persists in solution.
GREASE COMPOSITION WITH IMPROVED ANTI-FRETTING PROPERTIES AT LOW TEMPERATURES
申请人:KYODO YUSHI CO., LTD.
公开号:US20150299610A1
公开(公告)日:2015-10-22
The invention provides a grease composition containing a thickener, a base oil and an amine phosphate.