Siliconizing agent

Mixtures of low molecular weight silicon-based surfactants and cosurfactants have been used to prepare a self-dispersing microemulsion of silicone agents applied to building materials to impart water repellency [54, 55]. The structure of the surfactants used was not disclosed but they are described as being themselves reactive so that they bind to the surfaces of the building materials and become part of the water-repellancy treatment. 

When used as water repellents, the very marked water-repellent effect of the silicone is utilized. The active silicon agents are oriented by using special catalysts so that the optimum water-repellent effect is obtained. The textiles thus treated retain the ability to "breathe" in full. 

Siliconized Eppendorfs Coat Eppendorf tubes with a commercial siliconizing agent as recommended by the manufacturer. Rinse well with distilled water before autoclaving. 

The silane 94b (SAN-58-035 for the synthesis see Reference 166) is an inhibitor of the acyl-CoA cholesterol acetyltransferase167,168 which has been tested clinically and experimentally as a potential lipid-lowering and anti-atherosclerotic drug. 94b is reported to be 8.7 times more potent in the inhibition of cholesterol ester uptake by cells than its carbon analogue 94a22. Moreover, the silicon agent is considerably easier to prepare than the carbon counterpart. In this context it should be pointed out that a special benefit of silicon versus carbon chemistry is the greater ease with which many types of quaternary centers can be constructed. 

Modified silicone compounds are used to improve flow properties of coatings. Usually high surface tension is reduced by the presence of low surface tension silicone liquids. The silicone agents are modified to increase their compatibility with coating. 

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