A defoamer composition based on organofunctionally modified polysiloxanes contains one or more laterally polyether-modified polysiloxanes as component A and at least one terminally polyether-modified polysiloxane as component B.

Provided are a Gemini-type alkyl-polyoxyalkylene-modified silicone suitable for use in preparing a silicone emulsion; a production method of thereof; and a defoaming agent composition containing such Gemini-type alkyl-polyoxyalkylene-modified silicone. The Gemini-type alkyl-polyoxyalkylene-modified silicone is expressed by the following general formula (A): ##STR00001##
wherein each of R.sup.1, R.sup.2, R.sup.3, R.sup.4, R.sup.5 and R.sup.6 represents an alkyl group or the like; n represents an integer of 0 to 300; and (B) represents a group expressed by the following general formula (1) or general formula (2): ##STR00002##
wherein each of R.sup.7 and X represents a hydrocarbon group; R.sup.8 represents a hydrogen atom, a hydrocarbon group, a formyl group or an acyl group; and a and b represent numbers satisfying 2≦a≦200 and 0≦b≦200, provided that a+b=2 to 200.

Provided are a Gemini-type alkyl-polyoxyalkylene-modified silicone suitable for use in preparing a silicone emulsion; a production method of thereof; and a defoaming agent composition containing such Gemini-type alkyl-polyoxyalkylene-modified silicone. The Gemini-type alkyl-polyoxyalkylene-modified silicone is expressed by the following general formula (A): ##STR00001##
wherein each of R.sup.1, R.sup.2, R.sup.3, R.sup.4, R.sup.5 and R.sup.6 represents an alkyl group or the like; n represents an integer of 0 to 300; and (B) represents a group expressed by the following general formula (1) or general formula (2): ##STR00002##
wherein each of R.sup.7 and X represents a hydrocarbon group; R.sup.8 represents a hydrogen atom, a hydrocarbon group, a formyl group or an acyl group; and a and b represent numbers satisfying 2≦a≦200 and 0≦b≦200, provided that a+b=2 to 200.

An object of the present invention is to provide a biological corrosion inhibitor for a metal, which exhibits the effect at a low concentration and is superior in biodegradability. A biological corrosion inhibitor for a metal including 3-methylglutaraldehyde as an effective ingredient is provided.

An object of the present invention is to provide a biological corrosion inhibitor for a metal, which exhibits the effect at a low concentration and is superior in biodegradability. A biological corrosion inhibitor for a metal including 3-methylglutaraldehyde as an effective ingredient is provided.

The present disclosure relates to a method and a system for extracting fluids comprising natural gas and water from a reservoir via at least one oil well/gas well connected to at least one flow line network. For extracting fluids, a composition containing a foaming composition is injected at a pre-determined location into the oil well/gas well and/or the flow line network. The foaming composition is then agitated with the water and converted to foam. The agitation is carried out by the natural gas. The foam formed reduces the interfacial surface tension between the natural gas and the water, and thereby facilitates reduction in liquid holdup in the oil well/gas well and/or the flow line network. The system of the present disclosure includes at least one manifold, at least one distribution assembly and a plurality of control valves and sensors.

The present disclosure relates to a method and a system for extracting fluids comprising natural gas and water from a reservoir via at least one oil well/gas well connected to at least one flow line network. For extracting fluids, a composition containing a foaming composition is injected at a pre-determined location into the oil well/gas well and/or the flow line network. The foaming composition is then agitated with the water and converted to foam. The agitation is carried out by the natural gas. The foam formed reduces the interfacial surface tension between the natural gas and the water, and thereby facilitates reduction in liquid holdup in the oil well/gas well and/or the flow line network. The system of the present disclosure includes at least one manifold, at least one distribution assembly and a plurality of control valves and sensors.

The lubricating oil composition for a shock absorber of the present invention contains (A) a base oil composed of a mineral oil and/or a synthetic oil, (B) a tertiary amine represented by the following general formula (I), and (C) a zinc dithiophosphate represented by the following general formula (II): ##STR00001## wherein R.sup.1 and R.sup.2 each independently represent an aliphatic hydrocarbon group having from 1 to 5 carbon atoms, and R.sup.3 represents an aliphatic hydrocarbon group having from 12 to 24 carbon atoms in the general formula (I), ##STR00002## wherein R.sup.4 to R.sup.7 each independently represent one selected from an alkyl group and an alkenyl group each having 1 to 24 carbon atoms in the general formula (II).

The present invention relates to the use of polyglycerol partial esters as defoamers, in particular in coating and paint applications, to defoamers comprising polyglycerol partial esters, and to corresponding polyglycerol partial esters.

Provided is a defoaming agent for a liquid detergent, comprising the following components: component A1, a modified polyorganosiloxane formed by reacting a hydrogen-containing polyorganosiloxane, an unsaturated polyether and an α-olefin; component A2, a modified polyorganosiloxane formed by reacting a hydrogen-containing polyorganosiloxane, an unsaturated polyether and a bivinyl-terminated polyorganosiloxane; component B, an organosilicon composition composed of a hydrogen-containing polyorganosiloxane, a polymer composed of an acrylate and an α-olefin, silica and an organosilicon resin; component C, a thickening agent; and component ID, water. An excellent compatibility between the modified polyorganosiloxanes A1 and A2 enables the defoaming agent to exhibit an excellent defoaming performance, stability and clarity in a laundry detergent.