Viscosity index improver for lubricant compositions
申请人:Walton L. Kim
公开号:US20060199896A1
公开(公告)日:2006-09-07
A lubricant composition comprises a base oil and a viscosity modifier including an ethylene/α-olefin interpolymer. The ethylene/α-olefin interpolymer is a block copolymer having at least a hard block and at least a soft block. The soft block comprises a higher amount of comonomers than the hard block. The block copolymer has a number of unique characteristics disclosed here. Such block copolymers offer the possibility of improved low temperature performance and flexibility in formulating motor oil, gear lubricants and greases, etc.
Imidotungsten(vi) complexes with chelating amino and imino phenolates
作者:Mikko M. Hänninen、Reijo Sillanpää、Henri Kivelä、Ari Lehtonen
DOI:10.1039/c0dt01438a
日期:——
The reaction of WOCl4 with 2,4-di-tert-butyl-6-((isopropylamino)methyl)phenol followed by the reaction with phenyl isocyanate leads to the formation of imidotungsten(VI) complex [W(NPh)Cl3(OC6H3(CH2NH-i-Pr)-2-t-Bu2-4,6)] 4 with a chelating aminophenolate ligand. When the same procedure was applied using aminophenols with bulkier substituents in the amino group, the final product was an unexpected Schiff-base complex [W(NPh)Cl3(OC6H3(CHNPh)-2-t-Bu2-4,6)] 5, where the ligand is derived from 2,4-di-tert-butyl-6-((phenylimino)methyl)phenol. Complex 5 is also formed in the thermal degradation of 4. On the whole, 5 appears to be formed by a disproportionation of intermediate compounds, which are analogous to complex 4. The solid-state structures of 4 and 5 have been determined by X-ray crystallography whereas the solution structures were studied by 1H and 13C NMR.
VISCOSITY INDEX IMPROVER FOR LUBRICANT COMPOSITIONS
申请人:Dow Global Technologies LLC
公开号:EP1888725B1
公开(公告)日:2018-05-16
US7662881B2
申请人:——
公开号:US7662881B2
公开(公告)日:2010-02-16
Aluminum Complexes of Tridentate Amine Biphenolate Ligands Containing Distinct
<i>N</i>
‐alkyls: Synthesis and Catalytic Ring‐opening Polymerization
作者:Lan‐Chang Liang、Sheng‐Ta Lin、Chia‐Cheng Chien
DOI:10.1002/jccs.201200559
日期:2013.7
A series of aluminumcomplexes of amine biphenolate ligands that contain distinct N‐alkyl substituents have been prepared and employed for ring‐openingpolymerization (ROP) of ϵ‐caprolactone (ϵ‐CL). Alkane elimination of trimethylaluminum with H2[R‐ONO] ([R‐ONO]2− = [RN(CH2‐2‐O‐3,5‐C6H2(tBu)2)2]2−; R = tBu (1a), iPr (1b), nPr (1c)) in toluene solutions at 25 °C produces colorless crystalline [R‐ONO]AlMe
已制备了一系列含有独特的N-烷基取代基的胺双酚盐配体的铝配合物,并用于for-己内酯(ϵ-CL)的开环聚合(ROP)。三甲基铝的烷烃消除用H 2 [R-ONO]([R-ONO] -2- = [RN(CH 2 -2-O-3,5--C 6 H ^ 2(吨丁基)2)2 ] 2- ; R = t Bu(1a),i Pr(1b),n Pr(1c))在25°C的甲苯溶液中产生无色晶体[R‐ONO] AlMe(2a‐c)。这些有机铝配合物的X射线衍射研究表明,它们是具有四面体配位核畸变的四配位物质。在存在苯甲醇的情况下,配合物2a-c都是ϵ-CL的ROP的活性催化剂前体。ϵ-CL的ROP速率显然是N-烷基取代基的空间尺寸的函数,其顺序为2a < 2b < 2c。有趣的是,2b和2c均显示出受控的ROP催化作用,而2a在相同条件下产生低分子量的低聚物。在ROP中以2b或2c催化,ϵ-CL消失速率遵循伪一级动力学,后者比前者快约2