Aqueous lubricant
AssigneeIdemitsu Kosan Co., Ltd.
InventorsToyoji Kakuchi, Toshifumi Satoh, Ryosuke Sakai, Fumiaki Takagi, Masami Yamanaka
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Abstract
Provided is a water-based lubricant comprising a hyperbranch-type polyglycerol having an absolute molecular weight of from 5,000 to 500,000. The water-based lubricant has a small friction coefficient and is excellent in lubrication performance and defoamability, as compared with conventional water-based lubricants comprising an ethylene/propylene oxide copolymer, and is favorable, for example, for a water-based metal processing agent and a hydraulic pressure fluid.
Claims16
A water-based lubricant, comprising water and a hyperbranch-type polyglycerol having an absolute molecular weight of from 5,000 to 500,000.
A method for working, cutting or grinding a plastic, the method comprising working, cutting or grinding the plastic with a water-based metal processing agent comprising a water-based lubricant which comprises water and a hyperbranch-type polyglycerol having an absolute molecular weight of from 5,000 to 500,000.
A polymer, comprising a hyperbranch-type polyglycerol of formula (1):
- [η]=K·Mα (1)
- wherein
- α is less than 0.5;
- [η] is the intrinsic viscosity or the limiting viscosity of the polyglycerol;
- K is a constant;
- and
- M is the absolute molecular weight of the polyglycerol.
Dependencies are inferred from the claim text.