Viscosity index improving additives for phosphate ester-containing hydraulic fluids
申请人:ROHM AND HAAS COMPANY
公开号:EP0823472A1
公开(公告)日:1998-02-11
Polymer compositions derived from selected alkyl (meth)acrylate ester monomers used in certain weight ratios to provide improved viscosity control and low temperature performance characteristics in phosphate ester aircraft hydraulic fluids is disclosed. Polymer compositions for use as viscosity index improving additives in aircraft hydraulic fluids contain from 40 to 100 weight percent (C1-C10)alkyl (meth)acrylate and zero to 60 weight percent (C11-C20)alkyl (meth)acrylate monomer units. Preferred polymer compositions based on 40 to 70 weight percent (C1-C10)alkyl (meth)acrylate and 30 to 60 weight percent (C11-C15)alkyl (meth)acrylate monomer units combine good solubility in the phosphate ester hydraulic fluids with good viscosity control at low and high temperatures.
本发明公开了由选定的(甲基)丙烯酸烷基酯单体按一定重量比制成的聚合物组合物,用于改善磷酸酯飞机液压油的粘度控制和低温性能特性。用作飞机液压油粘度指数改进添加剂的聚合物组合物含有 40 至 100 重量百分比的(C1-C10)烷基(甲基)丙烯酸酯和零至 60 重量百分比的(C11-C20)烷基(甲基)丙烯酸酯单体单元。以 40% 至 70% 重量百分比的(C1-C10)烷基(甲基)丙烯酸酯和 30% 至 60% 重量百分比的(C11-C15)烷基(甲基)丙烯酸酯单体单元为基础的优选聚合物组合物兼具在磷酸酯液压油中的良好溶解性和在低温和高温下的良好粘度控制性。